APPARATUS AND PROCESS TO PACK A PRODUCT

专利摘要:
summary patent of invention: "apparatus and process for packaging a product". the present invention relates to a process for packaging a product (p) disposed on a support (4) comprising unwinding a film (10a), cutting across the unwound portion of film (10a) and preparing cut film sheets (18) , move the cut film sheets (18) to a packaging set (8) by defining a packaging chamber inside (24), progressively move a series of supports (4) inside the packaging chamber (24) from a packaging set (8), keep the packaging chamber (24) open long enough for a series of supports (4) and for a corresponding number of sheets of film (18) to be properly positioned within said packaging chamber (24), hermetically close the packaging chamber (24) with the sheets of film retained above the respective support (4) and at a sufficient distance to allow gas circulation inside the support (4), optionally causing one or both of : a gas withdrawal from the herme packaging chamber closed (24) and gas injection of a gas mixture of controlled composition, heat-sealing the film sheet (18) to said support (4), in which the cutting of the film (10a) into film sheets (18 ) occurs outside the packaging chamber (24) at a remote station to the place where the film sheets are attached to the supports. an apparatus (1) for carrying out the above process is also disclosed.
公开号:BR112015025753B1
申请号:R112015025753-4
申请日:2014-04-08
公开日:2021-04-13
发明作者:Riccardo Palumbo
申请人:Cryovac, Inc；
IPC主号:

专利说明:

DESCRIPTION Technical Field
[001] The present invention relates to an apparatus and a process for packaging a product. According to certain aspects, the invention relates to an apparatus and process for packaging a product under a controlled atmosphere or under a vacuum. According to other aspects, the invention relates to an apparatus and process for packaging a product's skin. Background of the technique
[002] Plastic containers are commonly used for food packaging and for a wide variety of other items in which a plastic lid is attached to the container, for example, by the application of heat.
[003] A method of connecting the lid to the tray involves using a laminated plastic lid that has a layer of metal foil: a power source provides an electrical current to an induction coil nearby, which induces a electrical current in the metal sheet to develop heat that melts portions of the lid and the container, and fuses the lid to the rim of the container. For example, EP0469296 discloses an induction sealing assembly using a single loop coil to seal a plastic cap to a plastic container. The set includes a nest having a recess for holding a container to be sealed, and a movable sealing head for holding a lid or sheet membrane, and for positioning the lid relative to an opening in the container. Means are provided for fixing a portion of the sealing head against a portion of the nest to form an airtight chamber between a lower portion of the sealing head and an upper portion of the nest. The induction sealing assembly uses a vacuum source and an inert gas source to flush the air out of the container before sealing. The induction coil mounted on the sealing head induces an electric heating current in the lid to seal the lid to the container. This solution uses a pre-cut lid: thus, the process efficiency is compromised as there must be provision for means to transport and load the front in the appropriate position. Furthermore, EP0469296 suggests using a roll stock sheet membrane to seal the container. In this case, however, there is absolutely no disclosure as to how and where the membrane must be cut to form the lid of the tray.
[004] In order to pack products, in particular food products, vacuum packaging has been developed in the past.
[005] Among the known vacuum packaging processes, vacuum skin packaging is commonly used to package food products, such as fresh and frozen meat and fish, cheese, processed meat, ready meals and the like. Vacuum bag packaging is described, for example, in FR 1 258 357, FR 1 286 018, AU 3 491 504, US RE 30 009, US 3 574 642, US 3 681 092 US 3 713 849, US 4 055 672 and US 5,346,735.
[006] Vacuum skin packaging is basically a thermoforming process. In particular, the product is typically placed on a rigid or semi-rigid support (such as a tray, bowl or glass). The support with the product placed in it is placed in a vacuum chamber where a film of thermoplastic material, held by vacuum in a position above the product placed in the support, is heated to soften it. The space between the support and the film is then evacuated and finally a vacuum above the film is released to make the film drape down around the product and seal on the surface of the support not covered by the product, thus forming a watertight skin around the product and on the support.
[007] US 2007/0022717 discloses a machine for packaging a gas-tight object using a film material. The machine has a lower tool to support two trays and an upper tool having cutting devices housed within the upper tool facing the lower tool. A film is interposed between the upper tool and the lower tool. The upper and lower tools are closed first against each other and then the film is cut to the size of the peripheral rings of the trays by the cutting devices operating inside the upper tool. Sealing tools heat-seal the cut regions of the film to the peripheral rim of the tray. A vacuum is located in the region surrounding the tray to cause deep drawing of the film. This reference also mentions that the same device can be used to seal trays with films that are not drawn deep to form a skin on the product.
[008] US 2005/0257501 discloses a machine for packaging a product arranged on a tray. The machine has a lower tool to support the tray and an upper tool with a cutting device. During operation, the film is stuck along an edge surrounding the tray and is deformed by the upper tool in one direction extending away from the product. The space surrounding the product is then evacuated, the film and the edge of the tray are sealed and the film is then cut by the cutting device.
[009] As for the machines disclosed by US 2007/0022717 and US 2005/0257501, the film is cut to the size of the tray inside the chamber formed by the upper tool and the lower tool, using the cutting devices provided in the upper tool. First, this disadvantageously requires providing a rather complex and bulky top tool. In addition, this disadvantageously requires providing an excess film with respect to the size of the support, the excess film of which is cut from the package and scraped during or at the end of the packaging process. In effect, the film is in the form of a web wound on a roll (for example, as shown in Figure 3 of US 2005/0257501). Therefore, an excess of film is necessary to allow the film to be pulled from the roll and kept in place above the supported product. In addition, in US 2007/0022717 more than one product-loaded support (namely two) is packaged in each cycle, so that an excess of film is also present between adjacent supports.
[0010] WO2011 / 012652 shows an apparatus for packaging a product in a tray. The machine comprises a first film transfer plate configured to hold a film sheet, heat the film sheet, bring the film sheet to a position above a tray with the product arranged in it and fix it in an airtight manner to film sheet to the tray. A second film transfer plate is also present. As for the first film transfer plate, the second film transfer plate is configured to hold a film sheet, heat the film sheet, bring the film sheet to a position above a tray with the product on it and securely secure the film sheet to the tray. During a first stage of operation of the machine, the first film transfer plate retains a first film sheet and heats the first film sheet, while the second film transfer plate releases a second film sheet, thereby allowing the second sheet is pulled into a first tray; and during a second stage of operation of the machine, the second film transfer plate retains a third film sheet and heats the third film sheet, while the first film transfer plate releases the first film sheet, thereby allowing the first sheet of film is pulled into a second tray. The machine further comprises a rotating cylinder suitable for rotating about its X axis, the first film transfer plate and the second film transfer plate being connected to the rotating cylinder so that when the rotating cylinder rotates around its X axis, the positions of the first film transfer plate and the second film transfer plate are exchanged. A vacuum arrangement allows air to be removed from inside the tray under the film sheet (positioned either by the first or the second film transfer plate) through at least one hole present in the tray. The film transfer plates are configured to release the film sheet, thereby allowing the film sheet to be pulled back into the tray while the vacuum arrangement is removing air from inside the tray.
[0011] Although the above solution improved previously known techniques, it should be noted that the apparatus and method described in WO2011 / 012652 were mainly designed and optimized for skin packaging: in other words, there is a need for a solution to keep everyone the positive aspects related to the reduction of residual material, while at the same time being adapted for packaging products under controlled atmosphere.
[0012] Thus, it is an object of the invention to design a process and an apparatus that can operate flexibly both for skin packaging and for modified atmosphere packaging and that are able to reduce plastic film consumption as much as possible.
[0013] It is yet another objective of the invention to design a process and apparatus for packaging products using either heat shrinkable films or non-heat shrinkable films.
[0014] Another objective is to offer a process and a device capable of increasing productivity and avoiding possible problems of poor positioning of the film cover or film skin on the support or tray. Summary of the invention
[0015] One or more of the objects specified above are substantially affected by a process and an apparatus according to any of the attached claims
[0016] Aspects of the invention are disclosed below.
[0017] A 1st aspect involves an apparatus 1 for packaging a product (P) disposed on a support 4, said support 4 having a base wall 4a and a side wall 4b, said apparatus 1 comprising:
[0018] a packaging set 8 configured to firmly attach one or more sheets of film 18 to said one or more supports 4, the packaging set 8, including: - a lower tool 22 defining a pre-fixed number of seats 23b to receive said one or more supports 4, and - an upper tool 21 facing the lower tool 22 and configured to retain one or more of said sheets of film 18, at least the upper and lower tools 21; 22 cooperating to define a packaging chamber 24;
[0019] said packaging set 8 being configured to operate at least in a first operating condition, wherein said packaging chamber 24 is opened to receive one or more of said sheets of film 18 and, in a second condition of operation, wherein said packaging chamber 24 is optionally airtight;
[0020] a film supply set 5 configured to provide a continuous film 10a;
[0021] a film cutting assembly 6 active on continuous film 10a and configured to cut sheets of film 18 of pre-fixed length from said continuous film 10a, wherein the film cutting assembly 6 is located outside said packaging chamber 24; and
[0022] a control unit 100.
[0023] In a 2nd aspect according to the 1st aspect, the device also comprises an inner wall 23 that is part of the lower tool and defines the seats 23b - in practice, the inner wall can define one, two or multiple seats adjacent all housed within the packing chamber 249.
[0024] In a 3rd aspect according to any of the previous aspects, the device has a control unit 100 connected to the packaging set 8 and configured to command the packaging set 8 to go from the first to the second condition of operation and vice versa.
[0025] In a 4th aspect according to any of the preceding aspects, comprising at least one transfer device 7 configured to position the cut film sheets 18 inside the packaging chamber 24 and above the respective support 4 .
[0026] In a 5th aspect according to the previous aspect, the transfer device 7 includes a support structure 16 having a flat retention surface 17 adapted to receive the at least one or more sheets of film 18 cut by the assembly cutting 6.
[0027] In a 6th aspect according to the previous aspect, the transfer device 7 includes a mechanism 25 active in the packaging set 8 and configured to move the upper tool 21 between a first position, in which the upper tool 21 it is positioned in correspondence with the support structure 16 and configured to take from the support structure 16 the one or more cut film sheets 18 and at least a second position, in which the upper tool 21 is aligned with the lower tool 22 and configured to position at least one sheet of film 18 above said support 4.
[0028] In a 7th aspect according to the 5th or 6th aspects, the transfer device 7 includes a mechanism 19 active in the support structure 16 and configured for relative movement of the support structure 16 with respect to the packaging set 8 between a first position, where the support structure 16 is positioned in the cutting assembly 6 and at least a second position, where the support structure 16 is positioned within said packaging chamber 24 and configured to place at least one film sheet 18 above said support 4.
[0029] In an 8th aspect according to any aspect of the 5th to 7th, the control unit 100 is configured to activate the film cutting set 6 to cut, outside the packaging chamber, the film continuous 10a on film sheets 10; activate the transfer device 7 and position the cut film sheets 18 inside the packaging chamber 24 and above the respective support 4.
[0030] In a 9th aspect according to any of the previous aspects, the control unit 100 is configured to leave the packaging set 8 in the first operating condition long enough for: - the support structure of the control device transfer 7 position inside the packaging chamber 24 and above the respective support 4 the cut film sheets 10 that have been cut out of the packaging chamber 24, and - the support structure of the transfer device 7, then exit the packaging chamber 24.
[0031] The support structure and the cutting set are then controlled by the control unit that is configured to command the support structure to take the position in the cutting set again, where the support structure receives one or more freshly cut film sheets (s).
[0032] In a 10th aspect according to any of the 7th to 9th aspects the mechanism 19 includes a transfer actuator 47 active in the support structure 16 and configured to push and pull the support structure (16) along a suitable path to achieve the displacement between said first and second positions.
[0033] In an 11th aspect according to any of the previous aspects, the apparatus also includes a conveying set 3 for moving one or more supports 4 along a predefined path to the package set 8, the transport set including a conveyor 46 configured to move a pre-fixed number of supports 4 per time, and where the control unit (100) is configured to synchronize the activation of the transfer device 7 with the passage of the packaging set 8 from the first to the second operating condition.
[0034] In a 12th aspect according to the previous aspect, the control unit 100 is configured to:
[0035] controlling the conveyor 46 to move the prefixed number of supports 4 from a region outside the packaging chamber 24 to a region within the packaging chamber 24, where the support or supports 4 of said prefixed number are in vertical alignment with respective film sheets;
[0036] synchronize the conveyor 46 so that the movement of the preset number of supports 4 from the region outside the packaging chamber 24 to the region within the packaging chamber 24 is forced to occur when the packaging chamber 24 is open.
[0037] In a 13th aspect according to any of the previous aspects, the apparatus includes a vacuum arrangement 27 connected to the packaging chamber 24 and configured to remove gas from said packaging chamber 24; optionally wherein the vacuum arrangement 27 comprises at least one vacuum pump 28 and at least one evacuation tube 29 connecting the interior of said packaging chamber 24 to the vacuum pump 28.
[0038] In a 14th aspect according to the previous aspect, said control unit 100 is further configured to control the vacuum arrangement 27 to withdraw gas from said packaging chamber 24 at least when the packaging set 8 is in the said second operating condition with said packing chamber 24 hermetically closed.
[0039] In a 15th aspect according to any of the previous aspects including a controlled atmosphere arrangement 30 connected to the packaging chamber 24 and configured to inject a gas stream into said packaging chamber 24.
[0040] In a 16th aspect according to the previous aspect, the controlled atmosphere arrangement 30 comprises at least one injection device 31, for example, including a controllable injection valve or a controllable injection pump and at least one tube injection 32 connecting the interior of said packaging chamber 24 to the injection device 31.
[0041] In a 17th aspect according to either of the two previous aspects in which said control unit 100 is further configured to control said controlled atmosphere arrangement 30 to inject said gas stream at least when the set of packaging 8 is in said second operating condition with said packaging chamber 24 hermetically closed.
[0042] In an 18th aspect according to any of the three previous aspects in which the controlled atmosphere arrangement 30 is configured to inject gas into the packaging chamber including an amount of one or more of N2, O2 and CO2 that is different of the amount of these same gases as present in the atmosphere at 20 ° C and at sea level (1 pressure atmosphere).
[0043] In a 19th aspect according to any of the previous aspects from 12th to 18th, in which the apparatus includes both the vacuum arrangement 27 and the controlled atmosphere arrangement 30.
[0044] In a 20th aspect according to the previous aspect, the control unit 100 is configured to control said controlled atmosphere arrangement 30 to start the injection of said gas stream or after a pre-fixed delay from the activation of said vacuum arrangement 27 or after a pre-set vacuum level has been reached within said packaging chamber 24.
[0045] In a 21st aspect according to either of the two previous aspects, said control unit 100 is configured to control said controlled atmosphere arrangement 30 to initiate the injection of said gas stream while said gas withdrawal from said packaging chamber is still in progress.
[0046] In a 22 ° aspect according to any of the previous aspects from 13 ° to 21 ° the control unit is configured to operate the vacuum arrangement 27 to remove gas from said packaging chamber 24 and create in the packaging chamber packaging 24 a vacuum level with a pressure between 10 kPa and 30 kPa (100 and 300 mbar).
[0047] In a 23 ° aspect according to any of the previous aspects from 13 ° to 22 ° the control unit is configured to operate the vacuum arrangement 27 to remove gas from said packaging chamber 24 and create in the packaging chamber packaging 24 a vacuum level with a pressure between 15 kPa and 25 kPa (150 and 250 mbar).
[0048] In a 24th aspect according to any of the previous aspects, the packaging set 8 further comprises: - a main actuator 33 active in at least one of said upper and lower tools 21; 22, the main actuator 33 being controlled by the control unit 100, - the control unit 100 being configured to act on the main actuator 33 and cause relative movement of the upper and lower tool 21; 22 along a main direction (A5), between said first operating condition, where the upper tool 21 is spaced from the lower tool 22, and said packaging chamber 24 is opened to receive one or more of said film sheets 18 and said second operating condition, where a closing surface 34 of the upper tool 21 abuts firmly against a closing surface 35 of the lower tool 22 to hermetically close said packaging chamber 24 with respect to an atmosphere outside the apparatus 1.
[0049] In a 25 ° aspect according to any of the previous aspects, the upper tool 21 comprises a film retaining plate 36 having a respective active surface 37 configured to receive the one or more sheets of film 18.
[0050] In a 26th aspect according to the previous aspect, the apparatus has means 38 for retaining the one or more sheets of film 18 in correspondence with said active surface 37,
[0051] said means 38 for retaining comprising one or more of the group of: - a vacuum source 39 controlled by the control unit 100, the control unit 100 being configured to activate the vacuum source 39 and make the retaining plate of film 36 receiving and retaining said one or more sheets of film 18 in correspondence with the active surface 37, - mechanical retainers associated with the active surface 37, - adhesive portions associated with the active surface 37, - heatable portions associated with the retaining plate 36 and controlled by the control unit 100 to cause heating of the active surface 37 and thus of the film sheet 18 in order to increase the adhesiveness of the film sheet to the active surface 37, - electrical systems associated with the retaining plate 36 and controlled by control unit 100 for charging the active surface 37 with a predetermined polarity.
[0052] In a 27th aspect according to either of the two previous aspects, the packaging set includes a heating structure 40 peripherally associated with the film retaining plate 36 and having a respective heating surface 41 which extends radially outwardly with respect to the active surface 37 of the retaining plate 36.
[0053] In a 28th aspect according to the previous aspect, the heating structure is configured so that: - at least when the packaging set 8 is in said second operating condition, the heating surface 41 of the heating structure heating 40 faces an end surface 23a of said inner wall 23 delimiting a respective of said seats 23b in the lower tool 22 e - the heating structure 40 and the film retaining plate 36 are relatively mobile with respect to each other along said main direction (A5), so that the heating surface 41 of the heating structure 40 can be selectively positioned in a position where it does not contact the film sheet and in a position where it contacts the film sheet 18 positioned above a support 4 located in one of said seats 23b.
[0054] In a 29th aspect according to either of the two previous aspects, in which the control unit 100 is configured to control the heating of the heating structure 40 so that the heating surface 41 is brought to at least one first temperature, for example, in the range between 150 ° C and 250 ° C.
[0055] In a 30 ° aspect according to any of the previous aspects from 25 ° to 29 °, in which the heating medium is integrated in the film retaining plate 36 and controlled by the control unit 100.
[0056] In a 31 ° aspect according to the previous aspect, the control unit 100 is configured to control the heating means so that the active surface of the film holding plate 36 is brought to at least a second temperature comprised between 150 ° C and 260 ° C, optionally between 180-240 ° C, more optionally between 200-220 ° C.
[0057] In a 32 ° aspect according to either of the two previous aspects, the control unit 100 is configured to independently control the heating means and the heating structure 40 and to adjust independently or allow the adjustment of the first and the second temperatures.
[0058] In a 33 ° aspect according to any of the aspects 27 ° to 32 °, the heating structure 40 comprises a metallic body incorporating at least one resistive and / or inductive element connected to a power source and the unit control unit 100 which is configured to control the power supply to supply current to the resistive or inductive element, so as to maintain the temperature of the heating surface 41 within a pre-fixed range around said first temperature. In practice, a thermostat is present and is associated with both the heating structure and the control unit so that the control unit supplies current to the resistive and / or inductive element when the temperature remains below a set temperature.
[0059] In a 34 ° aspect according to any aspect from 27 ° to 33 °, the heating structure 40 includes a metallic wire directly carried by the heating surface 41 of the heating structure 40, the metallic wire being connected to a power source and to the control unit 100 which is configured to control the power source to supply current to the metal wire during discrete time intervals (for example, shorter than 10 seconds) followed by time intervals where none current supply to the metal wire occurs.
[0060] In a 35 ° aspect according to the previous aspect, the control unit 100 is configured to control the energy source to supply current to the metallic wire when the step of sealing the film sheet 18 to the support 4 needs to occur .
[0061] In a 36 ° aspect according to any aspect of the 27 ° to 35 ° of the heating structure 40 includes a printed circuit formed on said heating surface 41 of the heating structure 40, the printed circuit being connected to a power source and the control unit 100 which is configured to control the power supply to supply current to the printed circuit during discrete time intervals (for example, shorter than 10 seconds) followed by time intervals when no supply of current to the printed circuit occurs exclusively.
[0062] In a 37 ° aspect according to the previous aspect, the control unit 100 is configured to control the power supply to supply current to the printed circuit, when the step of sealing the film sheet 18 to the support 4 needs to occur .
[0063] In a 38 ° aspect according to any of the previous aspects from 25 ° to 37 ° the film retaining plate 36 is rigidly coupled to the upper tool 21 and mounted on the latter, so that the film retention 36 is not relatively mobile with respect to the upper tool 21 at least along said main direction (A5).
[0064] In a 39 ° aspect according to any of the previous aspects from 25 ° to 38 ° the film retaining plate 36 is rigidly coupled to the upper tool 21 and mounted on the latter, so that the active surface 37 is flush with the bottom surface of the bottom tool 21.
[0065] In a 40 ° aspect according to either of the two previous aspects, said active surface of the retaining plate is of sufficient size to overlap, optionally completely overlap, with an end surface 23a of said inner wall 23 delimiting a respective one of said seats 23b in the lower tool 22.
[0066] In a 41st aspect according to any of the previous aspects, the packaging set 8 further comprises at least one side wall 42 movably associated with one of the upper tool 21 or the lower tool 22, in which: - the side wall 42 has a front surface 43a configured to abut against an abutment surface 43b of the other of said upper tool 21 or lower tool 22, - the side wall 42 is mounted on the packaging set so that when the packaging set is moves from said first to said second operating condition, the side wall 42 moves, correspondingly, from a first position, where the front surface of the side wall 43a is separated from said back surface 43b, so that the packaging chamber 24 is left open to receive one or more of said sheets of film 18, to a second position, where the front surface of the side wall 43a closes tightly against said abutment surface 43b so that said packaging chamber 24 is hermetically closed with respect to an atmosphere outside the apparatus 1.
[0067] In a 42nd aspect according to the previous aspect, where the control unit 100, after the packaging set has reached the second operating condition, is configured to act on the main actuator 33 and cause an additional relative movement the upper and lower tools 21; 22 along the main direction (A5), so that the film sheet held in position by the retaining plate 36 is pressed against the rim 4c of the support 4.
[0068] In the 43rd aspect according to the previous aspect, in which the additional relative movement causes a retraction of the side wall 42 against the reaction of a contrast element.
[0069] In a 44th aspect according to the previous aspect, in which the contrast element comprises one or more elastic elements 80.
[0070] The apparatus of any one of the preceding claims, wherein the lower tool 22 is provided with multiple seats 23b, each to host a corresponding support 4 and wherein the upper tool 21 is provided with a corresponding plurality of retaining plates 36 each to retain a respective sheet of film 18.
[0071] In a 44th aspect according to any of the previous aspects, the apparatus comprises: - a plurality of different support structures 16, each comprising a flat retention surface 17 adapted to receive a respective of said sheets of film 18, each of the support structures 16 being movable between at least the cutting set to catch the respective film sheet 18 and the interior of the chamber 24, to position the cut film sheet 18 in correspondence with the respective plate retainer 36 of the upper tool 21.
[0072] In the 45th aspect according to the previous aspect, the apparatus comprises: - a transfer actuator 47 active in the support structures 16 to allow movement of the support structures 16 and, thus, of the cut film sheets 18 of the cutting assembly 6 into the packaging chamber 24, the transfer actuator 47 being controlled by the control unit 100 so that to increase a spacing mutually between the support structures 16 before, when or subsequent to the movement of the support structures 16 of the cutting set 6 into the packaging chamber 24.
[0073] In the 46th aspect according to the previous aspects for each of said seats 23b, the packaging set 8 comprises: a series of pusher elements 44 adapted to move from a release position, where active portions 45 of pusher elements 44 are spaced away from the active surface 37 of the retaining plate 36, to an engaging position, where the active portions 45 of the pusher elements 44 press the edge portions of the cut film sheet 18 against said active surface 37 of the holding plate retention 36.
[0074] In a 47th aspect according to the previous aspect, said pusher element or elements 44 include one selected from the group of: - finger-shaped stops articulated to the upper tool 21 and active in correspondence with the corners of the said seats, - finger-shaped stops mounted on the lower tool 22, configured to be moved vertically and active in correspondence with the corners of said seats, - oscillating bars articulated mounted on the upper tool 21 and active in correspondence with the lateral edges of said seats seats, - oscillating bars mounted on the lower tool 22, configured to be moved vertically and active in correspondence with the lateral edges of said seats.
[0075] In a 48th aspect according to either of the two previous aspects, the apparatus includes at least one active pusher actuator in said pusher elements 44 under the control of said control unit 100 which is configured to activate said pusher actuator and moving the pusher elements 44 from said release position to said engaging position and vice versa.
[0076] In a 49th aspect according to any of the previous aspects, the apparatus has a frame 2 carrying: - the transport set 3, - the packaging set 8, - the film supply set 5 comprising a roll of film supported by a roll holder connected to said frame, - the film cutter assembly 6 comprising at least one blade 14 movable by said frame 2 and active in a position located between said packaging assembly 8 and the said film supply set 5.
[0077] In a 50th aspect according to the previous aspect, the control unit 100 is configured to execute the following cycle:
[0078] command the transport assembly 3 to move the said support 4 of said packaging chamber 24;
[0079] command the film cutter set 6 to cut at least one sheet of film 18,
[0080] command the transfer device 7 to position the cut film sheet 18 inside the packaging chamber 24 and above the respective support 4,
[0081] command the upper tool 21 to retain the cut film sheet 18 above, and at a distance, from said support 4,
[0082] command the packaging set 8 to move from the first to the second operating condition,
[0083] control the packaging set 8 to firmly fix the film sheet 18 to said support 4.
[0084] In a 51 ° aspect according to the previous aspect, the control unit 100 is configured to control - after the packaging set 8 has passed from the first to the second operating condition - the vacuum arrangement 27 to remove air from inside the airtight packaging chamber 24.
[0085] In a 52 ° aspect according to either of the two previous aspects, the control unit 100 is configured to control - after the packaging set 8 has passed from the first to the second operating condition - the controlled atmosphere arrangement 30 to inject a gas or mixture of gases into the packaging chamber 24.
[0086] In a 53 ° aspect according to any of the previous aspects the trays or supports used by the device are made of a single layer or, preferably, multiple layer polymeric material having the characteristics disclosed in the following section of the descriptive report identified as "Trays and supports".
[0087] In a 54 ° aspect according to any of the previous aspects the film 10a applied to the tray or to the support 4 to form a lid on the tray (for example, for modified atmosphere packaging - MAP) or a skin associated with the tray and the product contour combination is made of a flexible multi-layer material comprising at least a first heat sealable outer layer, an optional gas barrier layer and a second heat resistant outer layer. The film has the characteristics disclosed in the following section of the specification identified as "The film or film material".
[0088] In a 55 ° aspect according to any of the previous aspects, the control unit 100 comprises a digital processor (CPU) with memory (or memories), an analog type circuit or a combination of one or more units of digital processing with one or more analog processing circuits.
[0089] In a 56th aspect according to the previous aspect, the control unit 100 comprises one or more CPUs, in which one or more programs are stored in an appropriate memory of the CPU or connected to the CPU.
[0090] In a 57th aspect according to the previous aspect, the program or programs contain instructions that, when executed by the control unit, cause the control unit 100 to perform the steps described and / or claimed in connection with the control unit.
[0091] In a 58 ° aspect according to any of the three previous aspects the control unit 100 acts on and controls the transport set 3, the film cut set 6, the transfer device 7, the packaging set 8 and particularly the upper and / or lower tools 21, 22, the vacuum arrangement 27, if present, the controlled atmosphere arrangement 30, if present.
[0092] In a 59th aspect according to the four previous aspects, the control unit 100 is configured to control the execution of the following cycle:
[0093] commanding the transport set 3 to move the reference of the support along the predefined path in said packaging chamber 24, so that each support 4 to be packed is housed in the respective seat 23b;
[0094] command the film cutting set 6 to cut at least one sheet of film 18 exactly dimensioned at least to cover the mouth of the support 4 delimited by said ring 4c and at least part or all of the upper surface of the ring,
[0095] command the transfer device 7 to position the cut film sheet 18 inside the packaging chamber 24 and above the respective support 4,
[0096] command the upper tool 21 to retain the cut film sheet 18 above, and at a distance, from said support 4,
[0097] command the packing set 8 to move from the first to the second operating condition in order to hermetically close the packing chamber 24,
[0098] command the vacuum arrangement 27, if present, to remove air from said hermetically sealed packaging chamber and / or command the controlled atmosphere arrangement 30, if present, to inject a gas or mixture of gases into the chamber packing,
[0099] command the packaging set 8 to firmly fix the film sheet 18 to said support 4,
[00100] command the packaging set 8 from the second to the first operating condition.
[00101] In a 60 ° aspect according to the previous aspect, the control unit is configured to command the transport set 3 to move the support 4 with the film sheet firmly fixed 18 out of the packaging chamber 24.
[00102] In a 61 ° aspect according to the two previous aspects, the control unit is configured to command to repeat the above cycle.
[00103] In a 62nd aspect according to any of the previous aspects the control unit can also be configured to control the apparatus 1 in order to perform any of the packaging processes described below or claimed in the appended claims.
[00104] A 63rd aspect involves a process for packaging a product (P) disposed on a support 4, said support 4 having a base wall 4a and a side wall 4b, said process optionally using an apparatus 1 according to any one of the preceding claims, the process comprising the following steps: - unwinding a film 10a from the roll 10, - transversely cutting the unwound portion of the film 10a and preparing cut film sheets 18, - moving the cut film sheets 18 into a set packaging 8 by defining a packaging chamber 24 inside, - progressively moving a series of supports 4 into the packaging chamber 24 of a packaging set 8, - keeping the packaging chamber 24 open long enough for a series of supports 4 and for a corresponding number of film sheets 18 to be properly positioned within said packaging chamber 24, - tightly close the packaging chamber 24 with the film sheets film kept above the respective support 4 and at a distance sufficient to allow gas to circulate within the support 4, - heat seal the film sheet 18 to said support 4, - open the hermetically closed packaging chamber 24, - move support 4 with the film sheet firmly attached 18 out of the packaging chamber 24,
[00105] in which the cutting of the film 10a into film sheets 18 takes place outside the packaging chamber 24 at a station remote to the location where the film sheets are coupled to the supports.
[00106] In a 64th aspect according to the previous aspect, the process comprises the step of causing a withdrawal of gas from the airtight packing chamber 24 before the heat sealing step.
[00107] In a 65 ° aspect according to the two previous aspects, the process comprises the gas injection step or a mixture of gases of controlled composition in the hermetically closed packaging chamber 24 before the heat sealing step.
[00108] In a 66 ° aspect according to any of the three previous aspects in which the support 4 comprises a horizontal ring 4c radially emerging from said side wall 4b.
[00109] In a 67 ° aspect according to any of the previous four aspects, the film sheet 18 is cut to a size identical to that of the outer edge of the rim 4c or to a size radially smaller than the outer edge of the rim 4c, but sufficient to firmly close the mouth of the tray 4 and engage the upper surface of the rim 4c in a sealed manner.
[00110] In a 68th aspect according to any of the five previous aspects, the process comprises the steps of removing gas from the hermetically sealed packaging chamber 24 up to a pressure comprised between 10 kPa and 30 kPa (100 and 300 mbar), optionally between 15 kPa and 25 kPa (150 and 250 mbar), be reached inside said chamber and packaging 24 and then - while the film sheet 18 is kept at a distance from a support mouth - inject a gas modified atmosphere injected into the packaging chamber 24.
[00111] In a 69th aspect according to the previous aspect, in which the injection of said gas stream to create a modified atmosphere is while the gas withdrawal is still in progress, in order to shorten the time to create the atmosphere modified.
[00112] In a 70 ° aspect according to either of the two previous aspects in which, after the gas removal or gas injection step, the process includes a step of uniformly heating the film sheet 18 in case the film sheet will not be hot shrinkable or heat at least a peripheral portion 18b of film sheet 18 if the film is hot shrinkable and then bring film sheet 18 closer to support 4 and attach it firmly to the support 4c.
[00113] In a 71 ° aspect according to any of the previous aspects from 63 ° to 70 ° the trays or supports used in the process and are made of a polymeric material of single layer or, preferably, of multiple layers having the characteristics disclosed in the following section of the specification identified as "Trays and supports".
[00114] In a 72 ° aspect according to any of the previous aspects of the film 63 ° to 71 ° the film 10a applied to the tray or support 4 to form a lid on the tray (for example, for MAP - packaging of modified atmosphere) or a skin associated with the tray and combining the product's contour is made of a flexible multilayer material comprising at least a first heat sealable outer layer, an optional gas barrier layer and a second heat resistant outer layer . The film has the characteristics disclosed in the following section of the specification identified as "The film or film material". Brief description of the drawings
[00115] The present invention will become clearer by reading the following detailed description, given by way of example and not by way of limitation, to be read with reference to the attached drawings, in which:
[00116] Figure 1 is a schematic side view layout of an apparatus according to aspects of the invention. The layout of the device in figure 1 can be present in all the modalities described here.
[00117] Figures 2-8 are schematic side views with respect to a first embodiment of a packaging apparatus according to aspects of the invention. In these figures, consecutive phases of a packaging process operated by the first mode apparatus are shown. The apparatus and the process according to these figures are intended to form a modified atmosphere packaging.
[00118] Figures 9 to 11 are schematic side views relating to a second embodiment of a packaging apparatus according to aspects of the invention. In these figures, consecutive phases of a packaging process operated by the apparatus of the second embodiment are shown. The apparatus and the process according to these figures are intended to form a modified atmosphere packaging.
[00119] Figures 12 to 16 are schematic side views relating to a third embodiment of a packaging apparatus according to aspects of the invention. In these figures, consecutive phases of a packaging process operated by the apparatus of the third embodiment are shown. The apparatus and the process according to these figures are intended to form a skin package.
[00120] Figure 17 is a schematic side view of a transport device and a packaging set that can be used in any of the described or claimed modes when multiple supports or trays are packaged at the same time.
[00121] Figures 18 and 19 are seen in schematic plan showing the relative position of a plurality of support structures of a transfer device of the apparatus of figure 17, for example. In particular, Figure 18 shows the support structures outside the packaging chamber of the apparatus, while Figure 19 shows the support structures when positioned inside the packaging chamber.
[00122] Figures 20 to 22 show a particularity regarding the heating means associated with the retaining plate of the apparatus according to aspects of the invention.
[00123] Figure 23 is a schematic plan view showing a support and a sheet of film in relation to the overlap in color-response with the packaging set.
[00124] Figures 24 and 25 are seen taken according to the XXIV plane of figure 23 and show a particularity of the packaging apparatus relative to the pusher elements acting on the corners of the film sheet in accordance with certain aspects of the invention.
[00125] Figure 26 is another schematic plan view showing a support and a film sheet in relation to the overlap in color-correspondence with the packaging set.
[00126] Figures 27 and 28 are seen taken according to the XXVII plane of figure 26 and show a particularity of the packaging apparatus relative to a variant of pusher elements acting on the corners of the film sheet in accordance with certain aspects of the invention.
[00127] Figure 29 is an additional schematic plan view showing a support and a sheet of film in overlapping relationship in correspondence with the packaging set.
[00128] Figures 30 and 31 are side views showing a particularity of the packaging apparatus relative to another variant of pusher elements acting along the sides of the film sheet in accordance with certain aspects of the invention. Definitions and conventions
[00129] It should be noted that in the present detailed description, corresponding parts shown in the various figures are indicated with the same reference numeral in all figures. Note that the figures are not to scale and, therefore, the parts and components shown in them are schematic representations.
[00130] In the following description and in the claims, the apparatus and the process refer to the packaging of a product inside a support: the product can be a food product or not.
[00131] As used herein, support 4 means a container of the type having a base wall 4a, a side wall 4b and, optionally, an upper rim 4c radially emerging from the side wall 4b; note also that for the purpose of the present description the tray and the support have the same meaning and are used interchangeably. The tray or supports 4 can have a rectangular shape or any other suitable shape, such as round, square, elliptical, etc. The trays can be manufactured by thermoforming or injection molding. Trays or supports
[00132] The trays or supports 4 described and claimed herein can be made of a single layer polymeric material or, preferably, of a multilayer polymeric material.
[00133] In the case of a single layer material suitable polymers are, for example, polystyrene, polypropylene, polyesters, high density polyethylene, poly (lactic acid), PVC and the like, or foamed or solid.
[00134] Preferably, tray 4 is provided with gas barrier properties. As used herein, this term refers to a film or sheet of material that has an oxygen transmission rate of less than 200 cm3 / m2-day-bar, less than 150 cm3 / m2-day-bar, less than 100 cm3 / m2-day-bar, as measured according to ASTM D3985 at 23 ° C and 0% relative humidity.
[00135] Suitable materials for gas barrier 4 monolayer thermoplastic trays are, for example, polyesters, polyamides and the like.
[00136] If tray 4 is made of a multilayer material, suitable polymers are, for example, ethylene homo and copolymers, propylene homo and copolymers, polyamides, polystyrene, polyesters, poly (lactic acid) ), PVC and the like. Part of the multilayer material can be solid and part can be foamed.
[00137] For example, tray 4 may comprise at least one layer of a foamed polymeric material chosen from the group consisting of polystyrene, polypropylene, polyesters and the like.
[00138] The multilayer material can be produced either by coextrusion of all layers using coextrusion techniques or by glue or hot lamination of, for example, a rigid foamed or solid substrate with a thin film, usually called "lining ".
[00139] The thin film can be laminated, either on the side of tray 4 in contact with product P or on the side facing out of product P or on both sides. In the latter case, the laminated films on both sides of tray 4 can be the same or different. A layer of an oxygen barrier material, for example, copolymer (ethylene-covinyl alcohol), is optionally present to increase the shelf life of the packaged product P.
[00140] Gas barrier polymers that can be used for the gas barrier layer are PVDC, EVOH, polyamides, polyesters and mixtures thereof. The thickness of the gas barrier layer will be defined in order to provide the tray with an oxygen transmission rate appropriate for the specific packaged product.
[00141] The tray may also comprise a heat sealable layer. Generally, the heat sealable layer will be selected from polyolefins, such as ethylene homo or copolymers, propylene homo or copolymers, ethylene / vinyl acetate copolymers, ionomers and homo and copolyesters, for example, PETG, a modified polyethylene terephthalate with glycol.
[00142] Additional layers, such as adhesive layers, to better adhere the gas barrier layer to the adjacent layers, may be present in the gas barrier material for the tray and are preferably present depending in particular on the specific resins used for the gas barrier layer.
[00143] In the case of a multilayer material used to form tray 4, part of this structure can be foamed and part can be non-foamed. For example, tray 4 may comprise (from the outermost layer to the innermost food contact layer) one or more structural layers, typically of a material such as foamed polystyrene, foamed polyester or foamed polypropylene, or a molded sheet of, for example, polypropylene, polystyrene, poly (vinyl chloride), polyester or cardboard; a gas barrier layer and a heat sealable layer.
[00144] Tray 4 can be obtained from a sheet of foamed polymeric material having a film comprising at least one oxygen barrier layer and at least one laminated surface sealing layer on the side facing the packaged product, so that the surface sealing layer of the film is the food contact layer of the tray. A second film, either barrier or non-barrier, can be laminated to the outer surface of the tray.
[00145] Specific tray 4 formulations are used for food products that require heating in a conventional oven or microwave before consumption. The surface of the container in contact with the product, that is, the surface involved in forming the seal with the lid film, comprises a polyester resin. For example, the container can be made of cardboard coated with a polyester or it can be entirely made of a polyester resin. Examples of suitable containers for the packaging of the invention are CPET, APET or APET / CPET containers. Such a container can be either foamed or non-foamed.
[00146] Trays 4 used for cover or skin applications containing foamed parts have a total thickness of less than 8 mm and, for example, can be between 0.5 mm and 7.0 mm and, more often, between 1 , 0 mm and 6.0 mm.
[00147] In the case of a rigid tray containing no foamed parts, the total thickness of the single-layer or multi-layer thermoplastic material is preferably less than 2 mm and, for example, can be comprised between 0.1 mm and 1.2 mm and, more often, between 0.2 mm and 1.0 mm. The film or film material
[00148] The film or film material 10a described and claimed here can be applied to the tray or holder 4 to form a lid on the tray (for example, for MAP - modified atmosphere packaging) or a skin associated with the tray and combining the contour of the product.
[00149] The film for skin applications can be made of a flexible multilayer material comprising at least a first external heat sealable layer, an optional gas barrier layer and a second external heat resistant layer. The external heat-sealable layer may comprise a polymer capable of welding to the inner surface of the supports carrying the products to be packaged such as, for example, ethylene homo or copolymers, such as LDPE, ethylene / alpha-olefin copolymers, glass - ethylene / acrylic acid polymers, ethylene / methacrylic acid copolymers and ethylene / vinyl acetate copolymers, ionomers, copolyesters, for example, PETG. The optional gas barrier layer preferably comprises oxygen impermeable resins such as PVDC, EVOH, polyamides and mixtures of EVOH and polyamides. The external heat-resistant layer may be made of ethylene homo or copolymers, ethylene / cyclic olefin copolymers, such as ethylene / norbornene copolymers, homo or propylene, ionomer, (co) polyester copolymers, (co) polyesters, ) polyamides. The film may also comprise other layers, such as adhesive layers or rough layers, to increase the thickness of the film and improve its abuse and deep drawing properties. Crude layers used in particular are ionomers, ethylene / vinyl acetate copolymers, polyamides and polyesters. In all layers of film, the polymer components can contain appropriate amounts of additives normally included in these compositions. Some of these additives are preferably included in the outer layers or in one of the outer layers, while some others are preferably added to the inner layers. These additives include slip and anti-block agents such as talc, waxes, silica and the like, antioxidants, stabilizers, plasticizers, fillers, pigments and dyes, crosslink inhibitors, crosslink intensifiers, UV absorbers, odor absorbers, eliminators oxygen, bactericides, antistatic agents and similar additives, as known to those skilled in the art of packaging films.
[00150] One or more layers of film can be cross-linked to improve the film resistance and / or its heat resistance. Crosslinking can be achieved using chemical additives or by subjecting the film layers to an energetic radiation treatment. Skin packaging films are typically manufactured in order to show low shrinkage when heated during the packaging cycle. These films generally shrink less than 15% at 160 ° C, more often less than 10%, even more often less than 8%, both in the longitudinal and transverse direction (ASTM D2732). Films generally have a thickness between 20 microns and 200 microns, most often between 40 and 180 microns and even more frequently between 50 microns and 150 microns.
[00151] Leather packages are generally "easy to open", that is, they are easily opened by manually pulling out two wefts, usually starting from a point like a corner of the package where the upper weft was not purposely sealed to the support. To achieve this characteristic, either the film or the tray can be provided with a suitable composition, allowing easy opening of the package, as is known in the art. Typically, the sealing composition and / or the composition of the adjacent layer of the tray and / or the film are adjusted in order to achieve the easy opening characteristic.
[00152] Various mechanisms can occur while opening an easy-to-open package.
[00153] In the first ("easy peeling open") the packaging is opened separating the film and the tray at the sealing interface.
[00154] In the second mechanism ("adhesive failure") the opening of the package is achieved through an initial rupture, through the thickness of one of the sealing layers followed by delamination of this layer from the underlying support or film.
[00155] The third system is based on the "cohesive failure" mechanism: the characteristic of easy opening is achieved by an internal rupture of a sealing layer that, during the opening of the package, breaks along a plane parallel to the layer itself.
[00156] Specific mixtures are known in the art to obtain such opening mechanisms, to ensure the peeling of the film from the surface of the tray, such as those described in EP1084186.
[00157] On the other hand, in case the film 10a is used to create a lid on the tray or support 4, the film material can be obtained by coextrusion or lamination processes. Cover films can have a symmetrical or asymmetric structure and can be single-layer or multi-layer.
[00158] Multilayer films have at least 2, more often at least 5, even more often at least 7 layers.
[00159] The total thickness of the film can often vary from 3 to 100 microns, in particular from 5 to 50 microns, even more frequently from 10 to 30 microns.
[00160] The films can be optionally reticulated. Crosslinking can be carried out by irradiation with high-energy electrons at an appropriate dosage level as known in the art. The cover films described above can be heat shrinkable or heat cured. Hot shrinkable films typically show free shrinkage value at 120 ° C measured according to ASTM D2732 in the range of 2 to 80%, more often from 5 to 60%, even more often from 10 to 40%, both in the longitudinal direction how much trans versal. Hot curable films usually have free shrinkage values lower than 10% at 120 ° C, preferably lower than 5%, both in the longitudinal and transverse directions (ASTM D 2732). Lid films typically comprise at least one heat sealable layer and an outer skin layer that is generally composed of heat-resistant polymers or polyolefin. The sealing layer typically comprises a heat sealable polyolefin which, in turn, comprises a single polyolefin or a mixture of two or more polyolefins, such as polyethylene or polypropylene or a mixture thereof. The sealing layer can also be provided with anti-fog properties by incorporating one or more anti-fog additives in its composition or by coating or spraying one or more anti-fog additives on the surface of the sealing layer by techniques well known in the art. The sealing layer may further comprise one or more plasticizers. The skin layer may comprise polyesters, polyamides or polyolefin. In some structures, a mixture of polyamide and polyester can be advantageously used for the skin layer. In some cases, cover films comprise a barrier layer. Barrier films typically have an OTR (rated at 23 ° C and 0% RH according to ASTM D-3985) below 100 cm3 / (m2 day atm) and more often below 80 cm3 / (m ^ day atm) . The barrier layer is generally made of a thermoplastic resin selected from a saponified or hydrolyzate product of ethylene-vinyl acetate copolymer (EVOH), an amorphous polyamide and a vinyl-vinylidene chloride and mixtures thereof. Some materials comprise an EVOH barrier layer, sandwiched between two layers of polyamide. The skin layer will typically comprise polyesters, polyamides or polyolefin.
[00161] In some packaging applications, cover films do not comprise any barrier layer. Such films generally comprising one or more polyolefins are defined herein.
[00162] Non-barrier films typically have an OTR (rated at 23 ° C and 0% RH according to ASTM D-3985) from 100 cm3 / (mean atm) to 10,000 cm3 / (mean ^ atm), more typically up to 6,000 cm3 / (mean atm).
[00163] Peculiar compositions based on polyester are those used for ready meal packaging tray lids. For these films, polyester resins can make up at least 50%, 60%, 70%, 80%, 90% by weight of the film. These films are typically used in combination with polyester-based substrates.
[00164] For example, the container can be made of cardboard coated with a polyester or it can be entirely made of a polyester resin. Examples of suitable containers for packaging are CPET, APET or APET / CPET containers, either foamed or non-foamed.
[00165] Generally, biaxially oriented PET are used as the cover film due to their high thermal stability at heating / cooking temperatures of standard foods. Often biaxially oriented polyester films are heat curable, that is, not heat shrinkable. To improve the heat sealing ability of the PET cap film to the container, a heat sealable layer of a lower melt material is generally provided on the film. The heat sealable layer can be coextruded with the PET base layer (as disclosed in EP-A-1.529.797 and WO2007 / 093495) or it can be coated with solvent or by extrusion on the base film (as disclosed in US 2,762,720 and EP-A-1,252,008).
[00166] Particularly in the case of fresh red meat packaging, a double-cap film comprising an inner, oxygen-permeable and an external oxygen-impermeable film is advantageously used. The combination of these two films significantly prevents the discoloration of the meat also when the packaged meat extends upwards with respect to the height of the walls of the tray, which is the most critical situation in fresh meat barrier packaging.
[00167] These films are described, for example, in EP1848635 and EP0690012, the disclosures of which are hereby incorporated by reference.
[00168] The cover film can be monolayer. The typical composition of monolayer films comprises polyesters, as defined herein and mixtures thereof, or polyolefins, as defined herein and mixtures thereof.
[00169] In all film layers, the polymer components can contain appropriate amounts of additives normally included in these compositions. Some of these additives are preferably included in the outer layers or in one of the outer layers, while some others are preferably added to the inner layers. These additives include slip and anti-block agents such as talc, waxes, silica and the like, antioxidants, stabilizers, plasticizers, fillers, pigments and dyes, crosslinking inhibitors, crosslinking intensifiers, UV absorbers, odor absorbers, eliminators of oxygen, bactericides, antistatic agents, anti-fog agents or compositions and similar additives, as known to those skilled in the art of packaging films.
[00170] Films suitable for capping can advantageously be perforated to allow the packaged food to breathe.
[00171] These films can be perforated by using different technologies available in the art, by means of laser or mechanical means, such as rolls equipped with several needles.
[00172] The number of perforations per unit area of the film and its dimensions affect the gas permeability of the film.
[00173] Microperforated films are generally characterized by an OTR value (rated at 23 ° C and 0% RH according to ASTM D3985) of 2,500 cm3 / (m2 ^ dia atm) up to 1,000,000 cm3 / (m2 ^ dia atm ).
[00174] Macroperforated films are generally characterized by OTR (rated at 23 ° C and 0% RH according to ASTM D-3985) higher than 1,000,000 cm3 / (m ^ day atm).
[00175] Furthermore, the films described here for cap applications can be formulated to provide strong or unstable sealing on the support. A method for measuring the strength of a peelable seal, hereinafter referred to as "peeling force" is described in ASTM F-88-00. Acceptable peeling force values are in the range of 100 g / 25 mm to 850 g / 25 mm, from 150 g / 25 mm to 800 g / 25 mm, from 200 g / 25 mm to 700 g / 25 mm.
[00176] The desired sealing resistance is achieved by specifically designing the tray and cover formulations.
[00177] In general, one or more layers of the cover film can be printed in order to provide useful information for the consumer, a pleasant image and / or trademark information or other advertising information to intensify the retail sale of the product packed.
[00178] The film can be printed by any suitable method, such as by rotating screen, engraving or flexographic techniques, but known in the art. Definitions and conventions involving materials
PVDC are any vinylidene chloride copolymers in which a major amount of the copolymer comprises vinylidene chloride and a minor amount of the copolymer comprises one or more unsaturated monomers copolymerizable with them, typically vinyl chloride and acrylates or alkyl methacrylates ( for example, methyl acrylate or methacrylate) and mixtures thereof in different proportions. Generally, a PVDC barrier layer will contain plasticizers and / or stabilizers as is known in the art.
[00180] As used herein, the term EVOH includes saponified or hydrolyzed ethylene-vinyl acetate copolymers and refers to ethylene / vinyl alcohol copolymers having an ethylene comonomer content preferably comprised from about 28 to about 48 mole%, more preferably from about 32 to about 44 mole% of ethylene and even more preferably a degree of saponification of at least 85%, preferably at least 90%.
[00181] The term "polyamides", as used herein, is intended to denote both homo, and co, or have polyamides. This term specifically includes aliphatic polyamides or copolyamides, for example, polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 69, polyamide 610, polyamide 612, copolyamide 6/9, copolyamide 6/10, copolyamide 6/12, copolyamide 6/66, copolyamide 6/69, aromatic and partially aromatic polyamides or co-polyamides, such as polyamide 6I, polyamide 6I / 6T, polyamide MXD6, polyamide MXD6 / MXDI and mixtures thereof.
[00182] As used herein, the term "copolymer" refers to a polymer derived from two or more types of monomers and includes terpolymer. Ethylene homopolymers include high density polyethylene (HDPE) and low density polyethylene (LDPE). Ethylene copolymers include ethylene / alpha-olefin copolymers and ethylene / unsaturated ester copolymers. Ethylene / alpha-olefin copolymers generally include ethylene copolymers and one or more selected alpha-olefin comonomers having from 3 to 20 carbon atoms, such as 1-butene, 1-pentene, 1-hexene, 1-octene , 4-methyl -1-pentene and the like.
[00183] Ethylene / alpha-olefin copolymers generally have a density in the range of about 0.86 to about 0.94 g / cm3. The term linear low density polyethylene (LLDPE) is generally understood to include that group of ethylene / alpha-olefin copolymers that fall in the density range of about 0.915 to about 0.94 g / cm3 and particularly about 0.915 to about 0.925 g / cm3. Sometimes linear polyethylene in the density range of about 0.926 to about 0.94 g / cm3 is referred to as linear medium density polyethylene (LMDPE). Low density ethylene / alpha-olefin copolymers can be termed as very low density polyethylene (VLDPE) and ultra low density polyethylene (ULDPE). Ethylene / alpha-olefin copolymers can be obtained by polymerization or heterogeneous or homogeneous processes.
[00184] Another useful ethylene copolymer is an ethylene / unsaturated ester copolymer which is the ethylene copolymer and one or more unsaturated ester monomers. Useful unsaturated esters include vinyl esters of aliphatic carboxylic acids, where esters have 4 to 12 carbon atoms, such as vinyl acetate and alkyl esters of acrylic or methacrylic acid, where esters have 4 to 12 atoms of carbon.
[00185] Ionomers are copolymers of an ethylene and an unsaturated monocarboxylic acid having the carboxylic acid neutralized by a metal ion, such as zinc or, preferably, sodium.
[00186] Useful propylene copolymers include propylene / ethylene copolymers, which are propylene and ethylene copolymers having a majority weight content of propylene and propylene / ethylene / butene terpolymers which are copolymers of propylene, ethylene and 1-butene .
[00187] As used herein, the term "polyolefin" refers to any polymerized olefin that can be linear, branched, cyclic, aliphatic, aromatic, substituted or unsubstituted. More specifically, included in the term polyolefin are olefin homopolymers, olefin copolymers, copolymers of an olefin and a non-olefinic comonomer copolymerizable with the olefin, such as vinyl monomers, modified polymers thereof and the like. Specific examples include polyethylene homopolymer, polypropylene homopolymer, polybutene homopolymer, ethylene alpha-olefin copolymer, propylene alpha-olefin copolymer, butene-alpha-olefin copolymer, unsaturated ethylene-ester copolymer, unsaturated copolymer ethylene-unsaturated acid, (eg ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-acrylic acid copolymer and ethylene-acid copolymer - tacrylic), ethylene-vinyl acetate copolymer, ionomer resin, polymethylpentene, etc.
[00188] The term "polyester" is used here to refer to both homo and copolyesters, where homopolyesters are defined as polymers obtained from the condensation of a dicarboxylic acid with a diol and copolyesters are defined as polymers obtained from the condensation of one or more dicarboxylic acids with one or more diols. Suitable polyester resins are, for example, polyesters of ethylene glycol and terephthalic acid, i.e., poly (ethylene terephthalate) (PET). Preference is given to polyesters which contain ethylene units and include, based on the dicarboxylate units, at least 90 mole%, more preferably at least 95 mole%, of tephthalate units. The remaining monomer units are selected from other dicarboxylic acids or diols. Other suitable aromatic dicarboxylic acids are preferably isophthalic acid, phthalic acid, 2,5-, 2,6- or 2,7-naphthalenedicarboxylic acid. Of cycloaliphatic dicarboxylic acids, mention should be made of cyclohexa-nodicarboxylic acids (in particular cyclohexane-1,4-dicarboxylic acid). Of the aliphatic dicarboxylic acids, the alkanedioic acids (C3-C9) are particularly suitable, in particular, succinic acid, sebacic acid, adipic acid, azelaic acid, submeric acid or pyramic acid. Suitable diols are, for example, aliphatic diols, such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1, 3-butane diol, 1, 4-butane diol, 1,5-pentane diol, 2,2- dimethyl-1,3-propane diol, neopentyl glycol and 1,6-hexane diol and cycloaliphatic diols, such as 1,4-cyclohexanedimethanol and 1,4-cyclohexane diol, optionally diols containing heteroatom having one or more rings .
[00189] Copolyester resins derived from one or more dicarboxylic acid (s) or their lower alkyl diesters (up to 14 carbon atoms) with one or more glycols, particularly an aliphatic or cycloaliphatic glycol can also be used as the polyester resins for the base film. Suitable dicarboxylic acids include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid or 2,5-, 2,6- or 2,7-naphthalenedicarboxylic acid and aliphatic dicarboxylic acids such as succinic acid, sebacic acid, adipic acid, azelaic, submeric acid or pyelic acid. Suitable glycols (s) include aliphatic diols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-butane diol, 1,4-butane diol, 1,5-pentane diol, 2,2-dimethyl- 1,3-propane-diol, neopentyl glycol and 1,6-hexane diol and cycloaliphatic diols, such as 1,4-cyclohexanedimethanol and 1,4-cyclohexane diol. Examples of such copolyesters are (i) copolyesters of azelaic acid and terephthalic acid with an aliphatic glycol, preferably ethylene glycol; (ii) copolyesters of adipic acid and tephthalic acid with an aliphatic glycol, preferably ethylene glycol; and (iii) co-polyesters of sebacic acid and terephthalic acid with an aliphatic glycol, preferably butylene glycol; (iv) copolyesters of ethylene glycol, terephthalic acid and isophthalic acid. Suitable amorphous copolesters are those derived from an aliphatic diol and a cycloaliphatic diol with one or more dicarboxylic acids, preferably an aromatic dicarboxylic acid. Typical amorphous copolesters include terephthalic acid copolyesters with an aliphatic diol and a cycloaliphatic diol, especially ethylene glycol and 1,4-cyclohexanedimethanol. Detailed Description First device mode 1
[00190] Figures 1 to 8 show an apparatus 1 for packaging a product P arranged in a support or tray 4 according to an embodiment of the present invention. The apparatus 1 is adapted for modified atmosphere packaging, in which a plastic film, such as the film sheet 18 described below, is applied to the upper rim 4c of a support or a tray 4 after a modified gas atmosphere has been created. inside support 4 and / or for vacuum skin packaging of product P, in which a thin film of plastic material, such as film sheet 18 described below, is draped on the product and intimately adheres to a top ring and the inner surface of the support, as well as the product surface, thus leaving a minimum amount, if any, of air inside the packaging. Apparatus 1 can also be used in the case of a sheet of film applied to a tray or support and no vacuum or modified atmosphere is created.
[00191] The apparatus 1 comprises a frame 2, a transport set 3 for moving the support or tray 4, a film supply set 5, a film cut set 6, a transfer device 7 and a set of packing 8.
[00192] Tray 4 shown in the attached figures has a base wall 4a, a side wall 4b emerging from the base wall and delimiting a space where a product P can be accommodated and an upper rim 4c radially protruding from the side wall 4b : in the example shown, the upper rim 4c has a flat horizontal portion defining an optimal sealing surface to firmly fix a plastic film.
[00193] The frame 2 defines a basic body of the device 1 and serves to transport and support different parts of the device 1, as described herein.
[00194] The transport set 3 comprises a displacement plane 20 (which can be a physical plane, where the trays or the support are located and slide in an ideal plane along which the trays are guided, for example, by means of rails or guides). The plane 20 is defined in an upper area of the frame and a conveyor 46 is arranged in correspondence with the sliding plane 20. In the example shown, the transport set 3 is transported, for example, fixed to the frame 2 so that the plane slide 20 is substantially horizontal and the conveyor 46 moves the trays or supports 4 according to the horizontal direction indicated by the arrow A1 shown in Figure 1. The transport set 3 arranged in the frame 2 is configured to move the support or tray 4 along a predefined path from a loading station, where the supports or trays 4, which may already be filled with the respective product (s) P, are positioned in the packaging set 8 , where a sheet of film 18 is fixedly attached to each support or tray 4, as will be explained here in detail below. The conveyor 46 moves the trays, for example, a pre-set number of trays at a time, into the packaging chamber in the proper position to receive the cut film sheets. For example, a control unit 100 (which will be described hereinafter) can control conveyor 46 to move a pre-fixed number of trays or supports 4 by time from a region outside the packaging set to a region within the package. packaging set, where the tray or trays are in vertical alignment with the film sheets. The carrier can, for example, include a first transfer device 46a (such as the belt shown in Figure 1) configured to bring the trays in close proximity to the packaging assembly and a second transfer device 46b adapted to pick up one or more trays and bring them to the packaging station. The second transfer device may, for example, include arms acting on the sides of the trays or holders, in order to pick up the holders of the first transfer device, bring them to the packaging station and then return to the first device to transfer a new set of trays or supports 4. Alternatively, the conveyor 46 may include pushers (for example, in the form of bars extending transversely to said A1 direction) acting on the trays and pushing the trays into the packaging set . The pushers can be moved by chains or belts and can be moved into the packaging set to properly position a series of trays and then be retracted from the packaging set once the trays have reached their proper position within the last. According to another alternative, the carrier 46 may include housings (for example, in the form of plates provided with cavities to receive a series of trays) that are moved along said direction A1 and that are moving within the packaging station in together with supports or trays 4: according to the latter alternative, the housings are properly formed in order to be accommodated inside the packaging station during the application of film 10a to the tray or support 4.
[00195] Note that products P can be positioned on the support or in tray 4, either upstream of the charging station or in any location between the charging station and the packaging set 8. The transport set 3 still comprises an engine 9, for example, a stepper motor unit, for operating the conveyor belt 46 with stepwise motion.
[00196] The film supply set 5 may comprise a roll of film 10 providing a continuous film 10a. The film supply set 5 may further comprise an arm 11 (shown in dashed lines in figure 1) attached to the frame 2 and suitable for supporting the roll 10. In addition, the film supply set 5 may comprise punching devices. film (not shown to be known per se) essentially configured to provide the correct profile to the film edges to match, when cut transversely in the cutting set 6, with the shape of the mouth of the tray 4 with rounded corners. Punching devices can also help to keep a portion of unwound film pulled from the film roll 10 aligned in a pre-fixed direction. The film supply set 5 also comprises punch rollers 12 and / or other means for pulling the film from the roll 10 and properly positioning it in correspondence with the film cutter set 6 (for example, said means may comprise tweezers acting on the film side and / or tweezers acting on the front edge of the film and configured to pull the film).
[00197] Film 10a wrapped in film roll 10 can be made as disclosed above, depending on the specific need.
[00198] The film cutting set 6 comprises a cutting device 13 with a blade 14 and a blade piston 15. The piston 15 can be replaced by any other type of linear electric, pneumatic or hydraulic actuator. The blade piston 15 is preferably attached to the frame 2 and is connected to the cutting device 13 in order to push and pull it in a direction transverse to the unfolded portion of the film 10a, as indicated by the double arrow A2 shown in Figure 1 .
[00199] The apparatus packaging set 8 is configured to firmly fix the film sheets 18 to said supports 4; the packaging set 8 includes a lower tool 22 and an upper tool 21. The lower tool 22 has a series of inner walls 23 defining a pre-fixed number of seats 23b. In one embodiment, the lower tool 22 is provided with multiple seats 23b each to host a corresponding support 4; in this case the upper tool 21 is provided with a corresponding plurality of retaining plates 36, each for retaining a respective sheet of film 18.
[00200] Each of the seats 23b is configured to receive a support 4. For example, in the example of figures 2-8 the seat 23b is peripherally bounded by the inner wall 23 and the support or tray 4 is received inside the seat 23b, so that the upper rim 4c can rest above the end surface 23a of the inner wall 23. The upper tool 21 faces the lower tool 22 and is configured to retain one or more of said film sheets 18: in the example shown in figures 2-8 the upper tool 21 is configured to retain a cut film sheet 18. As shown in figures 2-8 the upper and lower tools 21, 22 cooperate to define a packaging chamber 24: in a first operating condition of the packaging set 8 - shown in figures 2 and 3.8 - the upper and lower tools 21 and 22 are separated and the packaging chamber 24 is opened, thereby allowing one or more of said sheets of film 24 to move from the cutting set 6 into the packaging chamber 24, as will be further detailed here below . In a second operating condition of the packaging assembly 8 - shown in figures 4-7, the packaging chamber 24 is preferably hermetically closed with respect to an atmosphere outside the apparatus 1.
[00201] Note that by hermetically closed we mean that the packaging chamber 24 cannot communicate freely with the atmosphere outside the same chamber, since gas can be supplied or removed from the chamber only via supply or discharge channels under the control of the device 1.
[00202] The aforementioned transfer device 7 is configured to position the cut film sheets 18 inside the packaging chamber 24 and above the respective support 4. The transfer device 7 includes a support structure 16 having a flat retaining surface 17 adapted to receive at least one or more sheets of film 18 cut by the blade 14: Figure 1 shows that the blade 14 cut the continuous film 10a and a sheet of film 18 is positioned in correspondence with the flat retention surface 17. The support structure 16 can retain the cut film sheet 18 using one or more of:
[00203] a vacuum system connected to one or more channels present in the support structure and leading to openings located in a retaining surface 17,
[00204] mechanical retainers, such as tweezers, clamps or the like;
[00205] adhesive systems, for example, comprising adhesive portions associated with the retention surface 17,
[00206] heating systems, for example, comprising heatable portions (controlled by control unit 100) associated with the support structure causing heating of the retaining surface 16 and, thus, of the film sheet 18, in order to increase the adhesion of the film sheet to the retention surface 17,
[00207] electrical systems, for example, the retaining surface can be charged with a different polarity than that typical of the plastic sheet 18. In this case, the control unit can be connected to a voltage generator and can control the electrical charging of the surface 17.
[00208] The transfer device 7 also includes a mechanism 19, for example, carried by the frame 2, active in the support structure 16 and configured to move relative to the support structure 16 with respect to the packaging set 8 between a first position, shown in figure 2, where the support structure 16 is positioned by the cutting device, for example, immediately downstream of the blade 14 with respect to the movement imposed on the film 10a, and at least a second position, in which the support structure 16 is positioned inside a packaging chamber 24. In the examples shown in the attached figures, the mechanism 19 includes a transfer actuator 47 active in the support structure 16 and configured to push and pull a support structure 16 along a path suitable for achieve the displacement between said first and second positions: for example, the transfer mechanism and actuator can move the support structure along u in a direction parallel to said horizontal direction A1 as indicated by the double arrow A3 in figure 1. The travel of the transfer actuator 47 is such that the support structure positions at least one sheet of film 18 above said support 4 within the chamber 24, just in front of a central portion of the upper tool 21, as shown in figure 3. Although the transfer actuator 47 shown, for example, in figure 1, is a piston, it can be replaced by any other type of electric linear actuator, pneumatic or hydraulic.
[00209] To summarize, the control unit 100 is configured to activate the film cutting set 6 to cut, outside the packaging chamber, the continuous film 10a on the cut film sheet (s) 10 and then , to activate the transfer device 7 to position the cut film sheet (s) 18 inside the packaging chamber 24 and above the respective support 4: the film sheets will then be further processed as Described below. Advantageously, the control unit 100 can be further configured to synchronize the activation of the transfer device 7 with the passage of the packaging set 8 from the first to the second operating condition, in order to optimize the timing of the process. In any case, the control unit 100 is configured to leave the packaging assembly 8 in the first operating condition long enough for the support structure 16 of the transfer device to position inside the packaging chamber 24 and above the respective support. 4 of the cut film sheet (s) 10 which was / were cut out of the packaging chamber 24 by the cutting set. The time must also be sufficient for the support structure to leave the packaging chamber 24 which can then be closed again under the control of the unit 100. The support structure and the cutting assembly are then controlled by the unit control panel that is configured to command the support structure to take the position in the cutting set again, where the support structure receives one or more sheets of freshly cut film (s). The support structures serve both as a support for the film sheet during cutting at the cutting station and as a support during the transport of the cut film sheets within the packaging chamber. Alternatively, instead of moving the support structure 16, the upper tool 21 can be movable with respect to the frame 2 and be configured to pick up the cut film sheets 18 from the area immediately downstream of the cutting device 13. In this case, the transfer device 7 would include a mechanism 25, for example, carried by the frame 2, active in the packaging set 8 and configured to move the upper tool 21 between a first position, where the upper tool 21 is positioned in correspondence with the structure of support 16 and configured to take from the support structure 16 the one or more cut film sheets 18 and at least a second position, where the upper tool 21 is aligned with the lower tool 22 and configured to position at least one sheet of film 18 above said support 4. In order to achieve the above movement the mechanism can move the upper tool 21 along any suitable path: for example example, in the attached figure 1 it is schematically shown that the mechanism 25 may include a transfer actuator 26 configured to push and pull the upper tool 21 along a direction parallel to said horizontal direction A1 as indicated by the double arrow A4 in figure 1. Alternatively, the mechanism 29 can cause the upper tool to rotate about an articulation axis; as another alternative, the mechanism 29 can cause both a pivoting movement and a translational displacement in order to move the upper tool from the respective first and second positions. The transfer actuator 26 can be in the form of a piston: it can be replaced by any other type of electric, pneumatic or hydraulic linear actuator. In figure 1, apparatus 1 includes both mechanism 19 and mechanism 25 described above.
[00210] The apparatus 1 also includes at least one control unit 100 which is connected to the transport set 3, the film supply set 5, the film cut set 6, the transfer device 7 and the packaging set 8. The control unit 100, which is schematically represented in figure 1, is configured to activate the transfer device 7, in order to animate the movement of the support structure 16 or the upper tool 21, as may be the case, in the positions described above. The control unit 100 is also configured to synchronize the activation of the transfer device 7 with the passage of the packaging set 8 from the first to the second operating condition so that the movement of the support structure 16 is caused to occur when the chamber packaging 24 is open while the packaging chamber 24 is closed only once the support structure 16 has transferred the cut film sheet 18 to the upper tool 21 and has left the packaging chamber 24. The control unit can also be configured to synchronize the conveyor 46 so that the movement of a pre-fixed number of trays or supporters 4 from a region outside the packaging chamber 24 to a region within the packaging chamber 24 is caused to occur when the packaging chamber 24 is opened while the packaging chamber 24 is closed once the said pre-fixed number of trays or supports 4 is in the proper position in relation to the tool higher score 21.
[00211] The apparatus 1 can also comprise a vacuum arrangement 27 connected to the packaging chamber 24 and configured to remove gas from said packaging chamber; the vacuum arrangement comprises at least one vacuum pump 28 and at least one evacuation tube 29 connecting the interior of said chamber 24 to the vacuum pump; the control unit 100 controls the vacuum pump 28 to draw gas from said packaging chamber 24 at least when the packaging assembly is in said second operating condition, i.e., with said packaging chamber is hermetically closed.
[00212] Apparatus 1 may also, or may alternatively, include a controlled atmosphere arrangement 30 connected to the packaging chamber 24 and configured to inject a gas stream into said packaging chamber; the controlled atmosphere arrangement comprises at least one injection device including an injection pump and / or an injection valve 31 acting on at least one injection tube 32 connecting the interior of said chamber to the gas source (not shown) which can be located remotely to device 1; the control unit 100 can be configured to control the opening and closing of the injection valve (or the activation of the injection pump) 31 to inject said gas stream at least when the packaging set 8 is in said second condition of that is, with said packing chamber 24 hermetically closed. The control unit 100 can also be configured to control the composition of the modified atmosphere generated within the chamber 24. For example, the control unit 100 can regulate the composition of the gas stream injected into the packaging chamber. Gas mixtures injected into the packaging chamber to generate a modified atmosphere may vary depending on the nature of the product P. In general, modified atmosphere mixtures include a volumetric amount of one or more of N2, O2 and CO2 that is different from the amount of these same gases as present in the atmosphere at 20 ° C and at sea level (1 pressure atmosphere). If product P is a product such as meat, poultry, fish, cheese, bakery or pasta, the following gas mixtures can be used (quantities are expressed as percentages in volume at 20 ° C, 1 atm of pressure): - Meat red, Poultry without skin: O2 = 70%, CO2 = 30% - Poultry with skin, Cheese, Pasta, Bakery products: CO2 = 50%, N2 = 50% - Fish CO2 = 70%, N2 = 30% or CO2 = 40%, N2 = 30%, O2% = 30 - Processed meat CO2 = 30%, N2 = 70%
[00213] According to one aspect, the control unit 100 can be configured to control said injection pump or said injection valve 31 to start injecting said gas stream or after a pre-set delay from the activation of said vacuum pump 28 or after a preset vacuum level has been reached inside said packaging chamber 24. In an additional aspect, the control unit 100 can cause the injection of said gas stream to start create a modified atmosphere while said vacuum pump 28 is still active, in order to shorten the time to create the modified atmosphere. Furthermore, since it is preferable to avoid having too strong vacuum in the packaging chamber 24 and at the same time it is desirable to ensure a suitable atmosphere within the chamber, it is advantageous to stop the vacuum pump after opening the gas injection. In this way, the pressure inside the chamber never falls below a desired value. During the overlapping the injected gas is mixed with residual air and continuing to pull a vacuum the modified atmosphere of mixing air continues to be removed so that the initial air quantity is decreased.
[00214] According to another aspect, it should be noted that the control unit 100 is configured to control said injection pump 31 so that the gas flow is not injected at too high a speed, which can damage the retention of the film cut by the upper tool. The control unit 100 can control the gas injection at a gas pressure set below a limit to prevent the film detachment or the film from being misplaced in correspondence with the upper tool 21 (the injection pressure is maintained between 130 kPa and 400 kPa (1.3 and 4.0 bar) or, optionally, between 150 kPa and 300 kPa (1.5 and 3.0 bars)).
[00215] Note that, in the examples shown, the evacuation tube 29 and the injection tube 32 communicate with a lower portion of the packaging chamber that is separated from an upper portion of the packaging chamber due to the presence of said inner wall (or of said internal walls) 23 that defines a septum-like species. In order to allow adequate gas circulation within the entire packaging chamber, the upper and lower portions of the packaging chamber 8 are fluidly connected by openings or channels located in the vicinity or on the inner wall 23. These openings or channels (see, for example , figures 3-5) are positioned so that they are not obscured by the walls of the tray when the tray is positioned on seats 23b.
[00216] Although apparatus 1 may have one or both of the vacuum arrangement 27 and the controlled atmosphere arrangement 30, it is to be understood that the control unit 100 of the apparatus 1 can also be configured to securely engage the film sheets 18 in the trays without activating the vacuum arrangement or the controlled atmosphere arrangement and thus leaving the atmosphere of the normal environment inside the tray. This may, for example, be the case for non-perishable products. In a simpler version, device 1 can be designed without a vacuum arrangement and without a modified atmosphere arrangement.
[00217] Now entering into a more detailed description of the packaging set 8, it should be noted that the latter also comprises a main actuator 33 active in at least one of said top and bottom tools 21, 22: in the example of figures 2-8 , the first actuator 33 is carried by the frame 2 and acts on the lower tool 22 under the control of the control unit 100; in practice the main actuator 33 can include a piston (the piston can be replaced by any other type of linear electric, pneumatic or hydraulic actuator) configured to raise and lower the lower tool 22 along a direction transverse to said horizontal direction A1: in the example in figures 1-8 the lower tool can be raised and lowered vertically by the main actuator 33, as indicated by the double arrow A5 shown in Figure 1. The control unit 100 is configured to act on the main actuator 33 and cause the tool to move lower 22 along the pre-fixed main direction indicated by arrow A5, between said first operating condition (figures 2 and 3), where the upper tool 21 is spaced from the lower tool 22 and said packaging chamber 24 is open to receive one or more of said sheets of film 18, and said second operating condition (figure 4), where a closing surface 34 of the tool upper 21 abuts firmly against a closing surface 35 of the lower tool 22 to hermetically close said packaging chamber 24 with respect to an atmosphere outside the apparatus; on said closing surfaces 34 and 35 a gasket or other element to facilitate a gas-tight closure can be positioned. As mentioned above, the control unit synchronizes the opening and closing of the packaging chamber with the movement of the support structure 16.
[00218] Once the chamber 24 has been closed, and after the operation of the vacuum and / or controlled atmosphere arrangement, the control unit is configured to act on the main actuator 33 to impose an additional vertical movement on the lower tool and, thus, also to the upper tool, since the latter now rests against the lower tool (figure 6) so that the film sheet 18 is placed in contact with the rim 4c of tray 4. Note that the elastic elements 55 can be interposed between the upper tool and the frame (such as one or more compression springs and / or one or more pneumatic actuators) to elasticly push the upper tool against the lower tool.
[00219] Also note that at each seat 23b operates at least one internal element 50, which in the apparatus of figures 1-8 includes a rod 51 and an end plate 52 configured to support at least the base 4a of the tray or support 4 The inner element is movable in relation to the lower tool 22 at least along the main direction of the A5 direction of the double arrow: in the modality shown (for example, see figure 9), the stem 51 can slide through an opening 53 in the part lower 54 of the lower tool 22, in order to allow relative movement between said inner element 50 and the lower tool 22. Note that the inner element can be controlled by a respective actuator (not shown) or it can be directly transported by the frame 2 In the examples shown, in the case where the lower tool is movable up and down, as described above, the inner element 50 can remain vertically fixed at least until the end plate reaches the bottom 54 bottom tool (see figures 4 to 7).
[00220] Going further, the upper tool 21 has at least one retaining plate 36 having a respective active surface 37 configured to receive one or more sheets of film 18 and means 38 for retaining one or more sheets of film 18 in correspondence with said active surface 37. The retention means 38 may comprise a vacuum source 39, for example, in the form of a pump, controlled by the control unit 100 and connected to a plurality of suction holes 48 present in correspondence with the active surface 37: the control unit 100 can be configured to activate the vacuum source 39 and make the film retaining plate 36 receive and retain said one or more sheets of film 18 in correspondence with the active surface 37. In particular, the control unit 100 can be configured to coordinate the activation of the vacuum source 39 with proper positioning of the cut film sheet 18 by the support plate 16: for example, the control unit control 100 can activate the vacuum source 39 and make the film retention plate 36 receive and retain said one or more sheets of film 18 in correspondence with the active surface 37, when the support structure 16 carrying the cut film 18 it is properly positioned inside the packaging chamber under the retaining plate 36. Note that in addition to or as an alternative to the vacuum source 39 the retaining means 38 may include one or more of the following:
[00221] mechanical retainers, such as tweezers, clamps or the like;
[00222] adhesive systems, for example, comprising adhesive portions associated with the active surface 37,
[00223] heating systems, for example, comprising heatable portions - controlled by the control unit 100 - associated with the retaining plate to cause heating of the active surface 37 and, thus, of the film sheet 18 in order to increase the adhesiveness of the sheet of film to the active surface 37,
[00224] electrical systems, for example, the active surface 37 can be charged with a different polarity than that typical of the plastic sheet 18. In this case, the control unit can be connected to a voltage generator and can control the electrical charging of the surface 37.
[00225] As will be further described here below when describing the operation of the apparatus 1, the control unit can be configured to create a vacuum in the packaging chamber 24 (by controlling the vacuum pump 28 to remove gas from said packaging chamber 24) until a pressure between 100 and 300 mbar, optionally between 150 and 250 mbar, is reached. This pressure level is low enough, but not too low so that detachment of the film sheet from the retaining plate 36 is avoided when the control unit also creates a pressure level in correspondence with the suction holes 48, acting on the vacuum source 39, below the pressure level in the packaging chamber.
[00226] As shown in figures 2 to 8 the packaging set 8 has a heating structure 40 peripherally associated with the film retaining plate 36 and having a respective heating surface 41 that extends radially outwardly in relation to the active surface 37 of the retaining plate 36. In practice, the retaining plate 36 is dimensioned to cover only a central portion 18a of the cut film sheet 18 while the heating surface 41 of the heating structure 40 is designed to heat a peripheral portion 18b of the cut film sheet 18 surrounding said central portion. The packaging set 8 and, in particular, the heating structure 40 are positioned and configured so that at least when the packaging set 8 is in said second operating condition, the heating surface 41 of the heating structure 40 turns for the end surface 23a of said inner wall 23 delimiting one of said seats 23b in the lower tool 22. Note that in the example of figures 2 to 8, the heating structure 40 and the film retaining plate 36 are initially positioned so that the heating surface 41 is retracted in relation to the active surface 37 (figures 2 to 6); on the other hand, also the heating structure 40 and the retaining plate 36 are relatively mobile relative to each other along said main (vertical) direction represented by the double arrow A5. In more detail, the retaining plate 36 is carried terminally by an axis 36a slidably coupled in relation to the heating structure 40 and having a backrest portion 36b intended to cooperate with the upper tool and the heating structure, as will be explained here below. An elastic element 60 (which can be, for example, a spring or a pneumatic actuator) can be interposed between the retaining plate and the heating structure: the elastic element 60 allows the positioning of the retaining plate 36, as shown in the figures 4 to 6, since the elastic element 60 tends to push the retaining plate downwards (the downward stroke of the retaining plate 36 in relation to the heating structure 40 is limited by the backrest portion 36a interfering with the heating structure 40 ). The control unit 100 is connected to the heating structure 40 and configured to control the heating of the heating structure 40 so that the heating surface 41 is brought to at least a first temperature (selected based on the materials used for the foil). film 18 and tray 7 to be suitable for sealing at least the peripheral portion of the cut film sheet to the rim of the tray).
[00227] Note that according to a variant, the heating means can be integrated into the film retaining plate 36 which can be configured to heat the active surface 37, in order to bring it at least to a second temperature. The heating means can be connected with the control unit 100 and the control unit be configured to control the heating means so that the active surface 37 of the film retaining plate 36 is brought up at least to said second temperature. Depending on the circumstances, the first and second temperatures can be the same or different. Advantageously, the control unit 100 is configured to independently control the heating means and the heating structure 40 and to independently adjust the first and second temperatures. In this way, the control unit 100 can allow an operator to adequately adjust the temperature of the heated parts of the upper tool 21 (active surface 37 and heating surface 41): the management of these temperatures by the control unit 100 allows to improve the connection between the film sheet 18 and the support or tray 7. In particular: the control unit 100 can be configured to control the first and second temperatures as follows: - in the case of shrink films 10 being used, then the control unit control can only cause heating of the heating surface 41, optionally only when the latter is pressed against the rim 4c of tray 4, - in the case of non-shrinkable hot films 10 being used, then the control unit can cause heating of the entire film sheet with the first and second temperatures being, for example, equal, - in the case of the skin packaging, then the control unit can cause aq uence of the entire film sheet, for example, with the second temperature being higher than the first temperature.
[00228] From a construction point of view, as shown in figures 20 to 22, the heating structure 40 may include a metallic body incorporating at least one resistive and / or inductive element 70 connected to a power source; in this case, the control unit 100 is configured to control the energy source to continuously supply current to the resistive or inductive element 70, so as to maintain the temperature of the heating surface 41 within a pre-fixed range around said first temperature.
[00229] In addition or independently of the latter, the heating structure 40 may include at least one metallic wire 71 directly carried by the heating surface 41 of the heating structure 40; the metallic wire is connected to a power source and to the control unit 100 which is configured to control the power source to supply current to the metallic wire during discrete time intervals. In practice the thermal inertia of the wire 71 is so small that the control unit can be programmed to make the power source supply current for short periods of time, for example, when the sealing of the film sheet 18 to the support needs to occur. During the rest of the cycle described above, the power source does not supply current to wire 71 which is basically at room temperature. This is useful when dealing with shrink films.
Alternatively or in addition to the latter, the heating structure 40 may include a printed circuit 72 formed on said heating surface 41 of the heating structure 40; the printed circuit is connected to a power source and to the control unit 100 which is configured to control the power source to supply current to the printed circuit for short periods of time, for example, when sealing the film sheet 18 to the support needs to occur. During the rest of the cycle described above, the power source does not supply current to wire 71 which is basically at room temperature. This is useful when dealing with shrink films.
[00231] As for the heating means that can be associated with the retaining plate 36, also the heating means can include at least one resistive and / or inductive element incorporated in the body of the retaining plate and connected to a power source; in this case, the control unit 100 is configured to control the power source to supply current to the resistive or inductive element, so as to maintain the temperature of the active surface 37 of the retaining plate 36 within a pre-fixed range around of said second temperature.
[00232] In addition to or independent of the latter, the retaining plate may include at least one metallic wire directly carried by the active surface 37 of the retaining plate 36 and connected to a power source and to the control unit 100 which is configured to control the power source to supply current to the metal wire during discrete time intervals. In practice the thermal inertia of the wire is so small that the control unit can be programmed to supply the energy source to supply current for a short time. During the rest of the cycle described above, the power source does not supply current to the wire, which is basically at room temperature.
[00233] Alternatively or in addition to the latter, the heating means may include a printed circuit formed on said active surface 37 of the retaining plate 36 and connected to a power source and the control unit 100 which is configured to control the power source to supply current to the printed circuit for short time intervals. During the rest of the cycle described above, the power source does not supply current to the printed circuit which is basically at room temperature.
[00234] Note that, when the film is heat shrinkable, the use of heating means can serve to tension the central portion of the film 18, after having fixed the film perimeter to the frame 4c.
[00235] As another variant an ultrasound generator can be used in place of or in addition to the heating structure and / or heating means; the ultrasound generator - if present - is configured to carry pressure energy (in the form of high frequency acoustic waves) in correspondence with the area occupied by the peripheral surface 18b of the film sheet 18 and the rim 4c of the support 4. The unit control panel can be programmed to control the ultrasound generator to cause the emission of acoustic waves at least when the film sheet and tray 4 are brought into contact with each other, as shown in figure 7.
[00236] As another variant, an electromagnetic wave generator can be used instead of or in addition to the heating structure and / or heating means; the electromagnetic generator - if present - is configured to concentrate electromagnetic energy (in the form of high frequency electromagnetic waves) in correspondence with the area occupied by the peripheral surface 18b of the film sheet 18 and the rim 4c of the support 4. The control can be programmed to control the generator to cause the emission of electromagnetic waves at least when the film sheet and tray 4 are brought into contact with each other, as shown in figure 7.
[00237] After the structural description above the first mode of device 1 here below, the operation of the first mode is disclosed. The operation takes place under the control of the control unit 100 and achieves a process of packaging a product in a tray. In this case, the described process allows packaging under a modified atmosphere. In any case, the apparatus 1 is also capable of making a skin packaging of the product. Furthermore, the apparatus 1 can be used to apply a lid to a tray and, thus, pack a normal ambient atmosphere.
[00238] The trays are progressively moved to the packaging set 8 by the transport set 3. At the same time, the squeeze rollers allow the film 10 to be unwound from the roll 10 and the cutting set prepares the cut film sheets in number and corresponding exactly to the trays to be closed. In practice, the film sheets can be cut to a size corresponding to that of the outer edge of the rim 4c, or they can be cut to a size radially smaller than the outer edge of the rim 4c, but sufficient to hermetically close the mouth of tray 4 and engage in a sealed manner on the upper surface of the rim 4c.
[00239] In apparatus 1 of figures 2 to 8 the packaging set includes, as described above, a main actuator 33. In the example shown, the main actuator is loaded by frame 2 and acts on the lower tool 22 under the control of the unit control 100 to raise and lower the lower one along the main direction A5 which is basically a vertical direction. In practice, after the transfer device 7 has moved the cut film sheet 18 into the packaging chamber 24 and the holding plate 36 has received the cut film sheet (see figures 2 and 3), the control unit 100 controls the main actuator 33 to close the packaging chamber 24 (Figure 4) raising the lower tool 22, so that the inner wall 33 intercepts the support 4 which is raised and separated from the inner element 50. Also note that during the phases shown in figures 2 to 4 the backrest portion 36b interferes with an integral part of the heating structure, so that the elastic deviation exerted by the element 60 can cause only a limited relative downward stroke of the retaining plate in relation to the heating structure. At this point, the packaging chamber is hermetically closed and the film sheet is retained by the retention plate 36 at a distance from the mouth of the tray or holder 4: as shown in figure 4, the vacuum arrangement is activated and a certain degree of vacuum created. Then, immediately after or during the vacuum creation, the controlled atmosphere arrangement is actuated (figure 5) and a controlled atmosphere created inside the packaging chamber. In certain variants, only the vacuum arrangement or only the controlled atmosphere arrangement can be actuated. Note that in case someone wants to operate the device 1 to simply apply a lid to a tray 4, then the vacuum arrangement and the modified atmosphere arrangement may not be activated. An additional vertical movement imposed on the lower tool 22 by the main actuator 33 overcomes the reaction of the elastic elements 55 (see figure 6) and brings the film sheet retention by the retaining plate in contact with the frame 4c of the support 4. In this position, the upper tool 21 interferes with the stop portion 36b: in the example in figures 2-8 a projection 21a fixed to the upper tool touches the stop portion 36b so that additional vertical movement of the lower tool would cause the vertical movement of the upper tool, abutment portion 36b and thus retaining plate 36. The control unit 10 is then configured to operate the main actuator 33 to raise the lower tool 22 further, overcoming the reaction of the elastic element 60 and thus causing the retaining plate 36 to raise the active surface 37 and the heating surface 41 to align perfectly (figure 7). At this point, when the heating surface 41 of the heating structure 40 contacts the peripheral portion 18b of the film sheet 18 positioned above a support 4, the control unit 100 causes heating of the heating structure 40 so that the heating surface 41 at least partially melts the plastic material of the peripheral portion of the film sheet 18 and / or of the rim 4c, thereby sealing the cut film sheet to the tray. Then, the control unit lowers the lower tool 22 and thus the packaging chamber 24 can be opened to allow the tray to proceed downstream of the packaging set. The cycle can then be repeated. Second device mode 1
[00240] In figures 9 to 12 a second mode of device 1 is shown. The general structure of figure 1 can also be applied to this second modality. For the sake of brevity, only aspects and components of this second modality other than those of the first modality will be described; the remaining aspects and components are the same as in the first modality and have been identified with the same reference numerals. The differences in relation to the first modality involve the packaging set: in the case of figures 9 to 11 of the packaging set 8, it comprises at least one sidewall 42 movably associated with one of the upper tool 21 or the lower tool 22. In the example illustrated in figure 9, the side wall 42 is associated with the lower tool 22 and slides tightly along the direction A5 (for example, vertically) in correspondence with the side surface of the lower tool. The side wall can be a single side wall or it can be formed by a plurality of side walls, each acting on a respective side of the lower tool 22 and normally pushed upwards by the action of a respective elastic element 80 (such as, for example , a spring or a pneumatic actuator). In the case of figures 9 to 11 the main actuator 33 carried by the frame 102 acts on the lower tool 22 under the control of the control unit 100 and vertically raises and lowers the lower tool, as indicated by the double arrow A5. The control unit 100 is configured to move the lower tool 22 between said first operating condition, where the upper tool 21 is spaced from the lower tool 22 and the side wall 42 is at a distance from the lower surface of the upper tool (figure 9 with the packaging chamber open), and said second operating condition, wherein the surface 43a of the side wall 42 abuts against the abutment surface, for example, the lower surface 43b of the upper tool (figure 10 with the chamber box 24 closed with respect to an atmosphere outside the device).
[00241] As mentioned above, the control unit 100 synchronizes the opening and closing of the packaging chamber with the movement of the support structure 16 of the transfer device 7 which is structured and operates as in mode 1.
[00242] In the second condition shown in figure 10, the packaging chamber is hermetically closed, but the film sheet is kept at a distance from the rim 4c, so that the vacuum arrangement and / or the controlled atmosphere arrangement can be operated as described for mode 1. The control unit can then operate the main actuator 33 to cause an additional upward movement of the bottom tool so that the film sheet held in position by the retainer plate 36 is pressed against the rim 4c of support 4. This additional stroke of the lower tool causes a retraction (ie a downward movement) of the side wall (s) 42 overcoming the reaction of the element (s) 80. Thanks in the presence of the side wall (s) 42, the upper tool may have a completely flat bottom surface as shown in figures 9 to 11.
[00243] Also note that, similarly to mode 1, each seat 23b operates at least one internal element 50 that includes a rod 51 and an end plate 52 configured to support at least the base 4a of the tray or holder 4 The inner element is movable with respect to the lower tool 22 at least along the direction of the double arrow A5: the rod 51 can slide through an opening 53 in the lower part 54 of the lower tool 22, to allow relative movement between said inner element 50 and the lower tool 22. Note that the inner element can be controlled by a respective actuator (not shown) or it can be directly transported by frame 2. In the examples shown in the case where the lower tool is mobile upwards and downwards, as described above, the inner element 50 can remain vertically fixed at least until the end plate reaches the lower part 54 of the lower tool (see figure 11).
[00244] Going in more detail, the upper tool 21 has at least one retaining plate 36 having a respective active surface 37, which is flush with the lower surface of the lower tool and which is sufficiently sized to contain the entire film sheet 18 In other words, the retaining plate covers the entire radial extension of the end surface 23a, and thus also the rim 4c. The retaining plate 36 is rigidly coupled to the upper tool 21, so that the film retaining plate 36 is not relatively movable with respect to the upper tool 21 at least along a direction A5 transverse to the horizontal direction A1. The retention means 38 may comprise a vacuum source 39, for example, in the form of a pump, controlled by the control unit 100 and connected to a plurality of suction holes 48 present in correspondence with the active surface 37. Note that in in addition to or as an alternative to the vacuum source 39 the retention means 38 may include one or more of the following:
[00245] mechanical retainers, such as tweezers, clamps or the like;
[00246] adhesive systems, for example, comprising adhesive portions associated with the active surface 37,
[00247] heating systems, for example, comprising heatable portions associated with the retaining plate to cause heating of the active surface 37 and thus of the film sheet 18 in order to increase the adhesiveness of the film sheet to the active surface 37,
[00248] electrostatic systems, for example, the active surface 37 can be charged with a different polarity than that typical of the plastic sheet 18.
[00249] The control unit 100 can be configured to control the means 38, for example, to activate the vacuum source 39 and make the film retainer plate 36 receive and retain said one or more sheets of film 18 in correspondence with the active surface 37. In particular, the control unit 100 can be configured to coordinate the activation of the means 38, for example, the vacuum source 39, with proper positioning of the cut film sheet 18 by the support plate 16 : for example, the control unit 100 can activate the means 38, for example, the vacuum source 39, and make the film retaining plate 36 receive and retain said one or more sheets of film 18 in correspondence with the surface active 37, when the support structure 16 that carries the cut film 18 is properly positioned inside the packaging chamber under the retention plate 36. The heating means can be integrated into the film retention plate 36 which can be configured to heat the active surface 37. The heating means can be connected with the control unit 100 and the control unit can be configured to control the heating means so that the active surface 37 of the film retaining plate 36 is brought up to the desired temperature. The heating means can be of the type described for mode 1. The control unit can control the heating means to generate a first temperature in the peripheral portion of surface 37 and a second temperature in the central portion of surface 37. The first and the second temperatures. In particular, the control unit 100 can be configured to control the first and second temperatures as follows: - in the case of shrinkable films 10 being used, then the control unit can only cause the peripheral portion of the active surface to heat up 37, optionally, only when the latter is pressed against the rim 4c of tray 4, - in the case of hot non-shrinkable films 10 being used, then the control unit can cause heating of the entire surface 37 and thus the entire film sheet with the first and second temperatures being, for example, equal, - in the case of skin packaging, then the control unit can cause heating of the entire active surface 37 and thus of the entire sheet of film, for example, with the second temperature being higher than the first temperature.
[00250] After the structural description above the second modality of device 1 here below, the operation of the second modality is disclosed. The operation takes place under the control of the control unit 100 and achieves a process for packaging a product in an alternative tray. In this case, the described process allows packaging under a modified atmosphere. In any case, the apparatus 1 is also capable of making a skin packaging of the product. The device can also be used to apply a lid to a tray with a normal ambient atmosphere.
[00251] After the transfer device 7 has moved the cut film sheet 18 into the packaging chamber 24 and the retainer plate 36 has received the cut film sheet (see figure 9), the control unit 100 controls the main actuator 31 to close the packaging chamber 24 (figure 10) by lifting the lower tool 22, so that the inner wall 33 intercepts the support 4 and the side wall 42 abuts against the upper tool 21. At this point, the packaging chamber it is hermetically sealed by the side walls acting against the lower surface 43b of the upper tool 21 and the film sheet 4 is retained by the retaining plate 36 at a distance from the mouth of the tray or support 4: the vacuum arrangement can be activated and a certain degree of vacuum created. Then, immediately after or during the vacuum creation, the controlled atmosphere arrangement can be actuated and a controlled atmosphere created within the packaging chamber. An additional vertical movement imposed on the lower tool by the main actuator 33 overcomes the reaction of the elastic element 80 and allows the retaining plate 36 to bring the colored film sheet into contact with the rim 4c; the control unit 100 causes heating of the heating means and sealing of the peripheral portion of the cut film sheet to the rim of the tray. Then, the control unit lowers the lower unit 22 and thus the packaging chamber 24 can be opened to allow the tray to proceed downstream of the packaging set. The cycle can then be repeated. Third device mode 1
[00252] In figures 12 to 16 a third mode of device 1 is shown. For the sake of brevity, only aspects and components of this second modality different from those of the first modality will be described; the remaining aspects and components are the same as in the first modality and have been identified with the same reference numerals. The differences in relation to the first modality involve the packaging set: in the case of figures 12 to 16 the upper tool 21 has at least one retaining plate 36 having a respective active surface 37: the retaining plate 36 is terminally transported by the axis 36a and covers the entire radial extent of the end surface 23a and thus also of the rim 4c. The axis of the retaining plate is coupled to the upper tool 21 to allow at least movement along the direction of the double arrow A5 as will be explained here below. The retention means 38 may comprise a vacuum source 39, for example, in the form of a pump, controlled by the control unit 100 and connected to a plurality of suction holes 48 present in correspondence with the active surface 37. Note that in in addition to or as an alternative to the vacuum source 39 the retention means 38 may include one or more of the following:
[00253] mechanical retainers, such as tweezers, clamps or the like;
[00254] adhesive systems, for example, comprising adhesive portions associated with the active surface 37,
[00255] heating systems, for example, comprising heatable portions associated with the retaining plate to cause heating of the active surface 37 and thus of the film sheet 18 in order to increase the adhesiveness of the film sheet to the active surface 37,
[00256] electrostatic systems, for example, the active surface 37 can be charged with a different polarity than that typical of the plastic sheet 18.
[00257] The control unit 100 can be configured to activate the means 28, for example, the vacuum source 39 and cause the film retaining plate 36 to receive and retain said one or more sheets of film 18 in correspondence with the active surface 37. In particular, the control unit 100 can be configured to coordinate the activation of the means 28, for example, of the vacuum source 39, with proper positioning of the cut film sheet 18 by the support plate 16: for For example, the control unit 100 can activate the means 28, for example, the vacuum source 39, and make the film retaining plate 36 receive and retain said one or more sheets of film 18 in correspondence with the active surface 37 , when the support structure 16 which carries the cut film 18 is properly positioned inside the packaging chamber under the retention plate 36. The heating means can be integrated into the film retention plate 36 which can be configured for to heat the active surface 37. No heating structure 40 analogous to that of mode 1 is present in mode 3. The heating means can be connected with the control unit 100 and the control unit can be configured to control the heating means of so that the active surface 37 of the film retaining plate 36 is brought to the desired temperature. The heating means can be of the type described for mode 2.
[00258] After the structural description above the third modality of device 1 here below, the operation of the third modality is disclosed. The operation takes place under the control of the control unit 100 and achieves a process of packaging a product in a tray. In this case, the described process allows a skin-like packaging of the product. In any case, apparatus 1 is also capable of packaging under a modified atmosphere. In addition, the device can be used to apply a film cap with normal ambient atmosphere remaining on the tray or holder 4.
[00259] In apparatus 1 of figures 12 to 16 after the transfer device 7 has moved the cut film sheet 18 into the packaging chamber 24 and the retainer plate 36 has received the cut film sheet (see figure 12) , the control unit 100 controls the main actuator 33 to close the packaging chamber 24 (figure 13) by lifting the lower tool 22, so that the inner wall 33 intercepts the support 4. At this point, the packaging chamber is hermetically closed and the film sheet is retained by the retention plate 36 at a certain distance from the mouth of the tray or support 4: as shown in figure 13, the vacuum arrangement can be activated and a certain degree of vacuum created. An additional vertical movement imposed on the lower tool 22 by the main actuator 33 overcomes the reaction of the elastic elements 55 (see figure 14) and brings the film sheet retention by the retaining plate in contact with the rim 4c of the support 4. The means of heating causes the film sheet 18 to be heated above a support 4: the film sheet is selected to be suitable for vacuum packaging and the heating surface is heated to a temperature that facilitates the subsequent deformation of the central portion of the sheet of film 18a. The control unit then causes the pump 39 to pump gas (instead of operating as a vacuum source) and thereby causes the film sheet to drift down into the product. Note that, alternatively, the control unit can simply connect the suction holes 48 to the atmosphere, when atmospheric pressure is in most cases sufficient. Additional heating generated by the heating means can facilitate the sealing of the peripheral portion of the film sheet to the rim 4c (see figure 15). The control unit 100 operates the main actuator to lower the lower tool 22 and thus the packaging chamber 24 can be opened to allow the tray to proceed downstream of the packaging set. The cycle can then be repeated. Other variants
[00260] In the case of figures 17 to 19 (which can be applied to any of the modalities described above or claimed), in which the lower tool 22 is provided with multiple seats 23b, the apparatus comprises a plurality of different support structures 16 each comprising a flat retention surface 17 adapted to receive a respective of said sheets of film 18; each of the support structures 16 is movable between at least the cutting set 6 to catch the respective film sheet 18, and the interior of the chamber 24, to position the cut film sheet 18 in correspondence with the respective retaining plate 36 of the upper tool 21. In this case, one or more transfer actuators 47 would be active in the support structures 16: there may be a transfer actuator dedicated to each structure 16 or an actuator dedicated to move a set of said structures (for example, all structures in the same row) or a single transfer actuator configured to move all structures 16 at the same time. The actuator or transfer actuators 47 are configured to allow movement of the support structures 16 and thus the cut film sheets 18 of the cutting set 6 into the packing chamber 24. The actuator or transfer actuators 47 is / are controlled by the control unit 100, in order to change between the support structures 16 before, when or subsequent to the movement of the support structures 16 of the cutting set 6 into the packaging chamber 24. This is shown in figures 18 and 19 schematically representing an example in which a plurality of support structures 16 - before, or when moving into the chamber, or subsequent to movement into the chamber, is further spaced in both X and Y directions (the X and Y directions are two mutually perpendicular and parallel reference directions the laying plan of the cut film sheets in correspondence with the cutting station). The transfer actuators can, in this case, include one or more pistons: any combination of electric, pneumatic or hydraulic actuators can be adopted.
[00261] Finally, as shown in figures 23 to 31, the packaging set 8 can include a series of pusher elements 44 useful for supporting the means 38 for fixing the sheet 18 on the active surface 37. This aspect can also be applied to any one of the above described or claimed modalities.
[00262] In particular, the pusher elements 44 are adapted to move from a release position, where active portions 45 of pusher elements 44 are spaced from the active surface 37 (see figures 25 and 31) of the retaining plate 36, to a position coupling (see figures 24, 27 and 30), where the active portions 45 of the pusher elements 44 press the edge portions of the cut film sheet 18 against said active surface 37 of the retaining plate 36.
[00263] Pusher elements 44 may include one selected from the group of:
[00264] finger-shaped stops articulated in the upper tool 21 and active in correspondence with the corners of said seats 23 (figures 24 and 25), in order to act on the corners of the film sheet 18 without interfering with the rounded corners the tray,
[00265] finger-shaped stops mounted on the lower tool 22 configured to be moved vertically and active in correspondence with the corners of said seats in order to act on the corners of the film sheet 18 without interfering with the rounded corners of the tray,
[00266] oscillating bars mounted articulated on the upper tool 21 and active in correspondence with the lateral edges of said seats 33 (figures 29 to 31),
[00267] oscillating bars mounted on the lower tool 22 and active in correspondence with the lateral edges of said seats.
[00268] Optionally, at least one actuator is active on said pusher elements 44 under the control of said control unit 100 which is configured to activate said actuator and move pusher elements 44 from said release position to said position of hitch and vice versa. Device control unit 1
[00269] The device according to the invention has at least one control unit.
[00270] The control unit 100 (schematically shown in figure 1) can comprise a digital processor (CPU) with memory (or memories), an analog type circuit or a combination of one or more digital processing units with one or more circuits analog processing systems. In the present description and in the claims it is indicated that the control unit 100 is "configured" or "programmed" to perform certain steps: this can be achieved in practice by any means that allow to configure or program the control unit. For example, in the case of a control unit 100 comprising one or more CPUs, one or more programs are stored in a suitable memory: the program or programs containing instructions that, when executed by the control unit, cause the control unit 100 to execute the steps described and / or claimed in connection with the control unit. Alternatively, if the control unit 100 is of an analog type, then the control unit circuits are designed to include circuits configured, in use, to process electrical signals, in order to perform the control unit steps disclosed herein. .
[00271] In general terms, the control unit 100 acts on and controls the transport set 3, the film cut set 6, the transfer device 7, the packaging set 8 and, in particular, the upper tools and / or lower 21, 22, the vacuum arrangement 27, the controlled atmosphere 30. In particular, the control unit 100 can be configured to control the execution of the following cycle:
[00272] commanding the transport set 3 to move said support along the predefined path in said packaging chamber 24, so that each support 4 to be packed is housed in the respective seat 23b;
[00273] control the film cutting set 6 to cut at least one sheet of film 18 exactly sized to cover the mouth of the support 4 delimited by said ring 4c and at least part or all of the upper surface of the ring,
[00274] command the transfer device 7 to position the cut film sheet 18 inside the packaging chamber 24 and above the respective support 4,
[00275] command the upper tool 21 to retain the cut film sheet 18 above, and at a distance, from said support 4,
[00276] command the packaging set 8 to move from the first to the second operating condition in order to hermetically close the packaging chamber 24,
[00277] to control the vacuum arrangement 27 to remove air from the airtight packaging chamber,
[00278] command the controlled atmosphere arrangement 30 to inject a gas or a mixture of gases into the packaging chamber,
[00279] command the packaging set 8 to firmly fix the film sheet 18 to said support 4,
[00280] command the packaging set 8 from the second to the first operating condition,
[00281] command the transport set 3 to move the support 4 with the sheet of film firmly fixed 18 out of the packing chamber 24 and then repeat the cycle above.
[00282] The control unit can also be configured to control the apparatus 1 in order to perform any of the packaging processes described below or claimed in the appended claims. Packing processes
[00283] Packaging processes according to aspects of the invention are now described.
[00284] The following processes can be performed by the device according to any of the above modalities and variants under the supervision of the control unit 100. According to one aspect of the invention, it is the control unit 100 that is controlled and programmed to performing the processes described below using an apparatus 1, as described in one of the above embodiments or as claimed in any of the appended claims.
[00285] The trays (or the supports) are progressively moved to the packaging set 8, for example, by the transport set 3. At the same time, the film 10a is unwound from the roll 10 and the cutting set 6 acting out of the packaging chamber 8 prepares the cut film sheets 18 in number and size corresponding exactly to the trays to be closed. In practice, the film sheets can be cut to a size corresponding to that of the outer edge of the 4c ring (for example, exactly identical or slightly larger than that of the outer edge of the 4c ring) or they can be cut to a radially smaller size than the outer edge of the rim 4c, but sufficient to hermetically close the mouth of the tray 4 and engage in a sealed manner on the upper surface of the rim 4c. In other words, the radial width of the cut film sheets can be comprised between the maximum radial width and the minimum radial width of the tray rim or support 4.
[00286] The preparation of the tray can be done beforehand, or the trays can be formed in line at a forming station during the cutting of the film sheets. Cutting of film 10a into film sheets 18 takes place at a station remote to the location where the film sheets are attached to the tray. The cut film sheet or - in the case of a plurality of trays being treated at a time - a plurality of cut film sheets is moved to the packaging set 8. As already described the film sheet (s) is / are cut from the continuous film before being / being moved into the packaging chamber. The packaging set 8 is left open long enough for a series of trays 4 and a corresponding number of sheets of film 18 to properly position themselves within the packaging chamber 24 defined in the packaging set. The transfer device 7 can be used as described above in order to move the film sheets inside the packaging chamber 24 that have been cut out of the packaging set 8. Basically, the film sheet located in the support structure 16, once cut, is carried by the support structure inside the chamber 24 in front of the upper tool (which is configured to pick up the cut film sheets) from a support structure 16. The support structure 16 releases the cut film sheet to the upper tool and returns back out of the packaging chamber. Then, the packaging set 8 is closed and the film sheets are kept above the respective tray, but at a sufficient distance to allow gas to circulate within the tray. The packaging chamber is hermetically closed in the sense that only controlled gas streams can be removed and / or injected into chamber 24 under the supervision of device 1 (note that in this case, closing the tray does not require vacuum and or no controlled atmosphere , then, the packaging chamber can be simply closed without an airtight closure). At this point, the packaging process may vary depending on the type of packaging and depending on the type of film sheet available.
[00287] If, for example, a sheet of hot non-shrinkable film is being used as a tray lid, and if it is intended to create a modified atmosphere packaging, then a partial vacuum is created inside the packaging chamber and a gas for modified atmosphere contemporaneously or subsequently injected. When a partial vacuum is formed in the packaging chamber 24 (for example, by the control unit 100 controlling the vacuum pump 28 to remove the gas from said packaging chamber 24) gas is removed up to a pressure comprised between 100 and 300 mbar, optionally, between 150 and 250 mbar, to be reached inside the packaging chamber 24. This pressure level is low enough, but not too low, so that the detachment of the film sheet from the retaining plate 36 is avoided when a level of pressure is formed in correspondence with the suction holes 48 which are below the pressure level in the packaging chamber. At this stage, the film sheet (s) is / are held by the retaining plate which can be provided with means for retaining the film in the proper position as described above. Then, after a pre-fixed delay of the start of the gas withdrawal (for example, after a pre-fixed delay of the activation of the said vacuum pump 28) or after a pre-fixed level of vacuum has been reached within the said packaging chamber 24, a modified atmosphere gas is injected into the packaging chamber 8. The injection of said gas stream to create a modified atmosphere can be started even while the gas withdrawal is still in progress, in order to shorten the time to create the modified atmosphere. Furthermore, since it is preferable to avoid having too strong a vacuum in the packaging chamber and, at the same time, it is desirable to ensure a suitable atmosphere within the chamber, it is advantageous to interrupt the generation of vacuum after the gas injection has already started. In this way, the pressure inside the chamber never falls below a desired value. During the overlap the injected gas is mixed with residual air and by continuing to pull vacuum the gas from the modified atmosphere of mixing air continues to be removed so that the amount of initial air in any case is decreased.
[00288] The film sheet 18 can be uniformly heated or it can be heated at least in correspondence with its periphery 18b. This operation can take place using the heating structure 40 and / or the heating means associated with the retaining plate 36. At least one of the peripheral film portion 18b and the rim 4c is brought to a temperature allowing the hot connection of the portion peripheral film 18b to the rim of tray 7 and a watertight closure of tray 7. Then, or at the same time as heating, the film sheet is lowered and firmly attached to the tray. In the event that ultrasonic or microwave based heaters are used they are operated at this stage and also the tray 4c rim can be heated at the same time. Once the connection has been completed, the packaging chamber can be opened and the tray provided with a watertight lid formed by the cut film sheet 18 can proceed out of the packaging chamber.
[00289] If, for example, a sheet of hot shrinkable film is being used as a tray lid, and if it is intended to create a modified atmosphere packaging, then a partial vacuum is created inside the packaging chamber and a gas for modified atmosphere contemporaneously or subsequently injected. When a partial vacuum is formed in the packaging chamber 24 (for example, by the control unit 100 controlling the vacuum pump 28 to remove the gas from said packaging chamber 24) gas is removed up to a pressure comprised between 100 and 300 mbar, optionally, between 150 and 250 mbar, to be reached inside the packaging chamber 24. This pressure level is low enough, but not too low, so that the detachment of the film sheet from the retaining plate 36 is avoided when a level of pressure is formed in correspondence with the suction holes 48 which are below the pressure level in the packaging chamber. At this stage, the film sheet (s) is / are held by the retaining plate which can be provided with means for retaining the film in the proper position as described above. Hot shrinkable films can be very thin (for example, the thickness can be up to a range of 20 to 40 microns) and handling after cutting is difficult so that it is relevant that the pressure levels in the packaging chamber and in the retaining plate are properly controlled. Then, after a pre-fixed delay of the start of the gas withdrawal (for example, after a pre-fixed delay of the activation of said vacuum pump 28) or after a pre-fixed level of vacuum has been reached within said packaging chamber 24, a modified atmosphere gas is injected into the packaging chamber 8. The injection of said gas stream to create a modified atmosphere can be started even while the gas withdrawal is still in progress, in order to shorten the time to create the modified atmosphere. Furthermore, since it is preferable to avoid having too strong a vacuum in the packaging chamber and, at the same time, it is desirable to ensure a suitable atmosphere within the chamber, it is advantageous to interrupt the generation of vacuum after the gas injection has already started. In this way, the pressure inside the chamber never falls below a desired value. During the overlap the injected gas is mixed with residual air and by continuing to draw vacuum the gas from the modified atmosphere of mixing air continues to be removed so that the amount of initial air in any case is decreased. The film sheet 18 can be heated in correspondence with its periphery 18b. This operation can take place using the heating structure 40. At least one of the peripheral film portion 18b and the rim 4c is brought to a temperature allowing the hot connection of the peripheral portion of film 18b to the rim of tray 7 and a watertight closure of the tray 7. The film sheet is then lowered and firmly attached to the tray. In the event that ultrasonic or microwave-based heaters are used, they are operated at this stage and also the 4c rim of the tray can be heated at the same time. Once the connection has been completed, the packaging chamber can be opened and the tray provided with a watertight lid formed by the cut film sheet 18 can proceed out of the packaging chamber.
[00290] If, for example, a sheet of hot shrinkable film is being used and if it is intended to create a vacuum skin package, then a vacuum is created inside the packaging chamber. Then, the film sheet 18 can be uniformly heated or it can be heated at least in correspondence with its periphery 18b to a first temperature suitable for heat sealing and it can be heated in correspondence with its central portion at a second temperature, for example, equal to or above the first temperature, suitable for making the film sheet highly deformable. This operation can take place using the heating structure 40 and / or the heating means associated with the retaining plate 36. Then, once a suitable vacuum level for skin packaging has been reached, the film sheet is lowered in a way that the peripheral portion 18b of the film sheet 18 contacts the rim 3c of the tray 7. In the case of ultrasonic or microwave-based heaters are used they are operated at this stage and also the rim 4c of the tray can be heated at the same time. The retaining plate releases the film sheet and normal atmosphere pressure is created above the film sheet, which then drapes downwards and matches the shape of the product P and the inner walls of the tray creating a plastic film skin around of the product and on the tray surfaces not occupied by the product P. In other words, when a predefined low pressure is reached inside the packaging chamber and thus inside the tray or support 4 under the film sheet 18, the film sheet film 18 is released and pulled down by the vacuum inside the support 4. Once the film sheet 4 is heated (and then softened) under the effect of the vacuum inside the support 4 it deforms to adhere to the product P and the inner surface of support 4 (see figures 15 and 16). In practice, the film is at least attached to the rim 4c and portions of the inner surface of the support 4. Once the connection has been completed the packaging chamber can be opened and the tray provided with a tightly associated skin formed by the foil. film 18 can move out of the packaging chamber.
[00291] Alternatively, no vacuum can be created and the film is attached to the tray, thus creating a sealed tray with an ambient atmosphere inside.
[00292] Although the invention has been described in connection with what is currently considered to be the most practical and preferred modalities, it is to be understood that the invention is not limited to the disclosed modalities, but on the contrary, it is intended to cover various modifications and equivalent provisions included within the spirit and scope of the appended claims.
[00293] For example, the elastic elements 55, 60, 80 can be replaced by linear actuators controlled by the control unit 100.
[00294] The specific nature of the actuators described is exemplary and alternative types of actuators can be used as long as the type of movement imposed on the moving parts in which the said actuators are operating is the same.
[00295] Also note that although the modalities described show a single package set 8, multiple package sets can be used in parallel together with multiple transfer devices 7 in order to optimize productivity.

权利要求:
Claims (25)
[0001]
1. Apparatus (1) for packaging a product (P) arranged on a support (4), said support (4) having a base wall (4a) and a side wall (4b), said device (1) characterized in that it comprises: a packaging set (8) configured to firmly attach one or more sheets of film (18) to said one or more supports (4), the packaging set (8), including: - a lower tool (22) comprising at least one inner wall (23) defining a pre-fixed number of seats (23b) for receiving said one or more supports (4), and - an upper tool (21) facing the lower tool (22 ) and configured to retain one or more of said film sheets (18), at least the upper and lower tools (21; 22) cooperating to define a packaging chamber (24); said packaging set (8) being configured to operate at least in a first operating condition, wherein said packaging chamber (24) is opened to receive one or more of said film sheets (18) and, in a second operating condition, wherein said packaging chamber (24) is closed; a film supply assembly (5) configured to provide a continuous film (10a); a film cutting set (6) active in the continuous film (10a) and configured to cut film sheets (18) of pre-fixed length from said continuous film (10a), in which the film cutting set ( 6) is located outside said packaging chamber (24); at least one transfer device (7) configured to position the cut film sheets (18) inside the packaging chamber (24) and above the respective support (4), said transfer device (7) including: - a structure support (16) having a flat retaining surface (17) adapted to receive at least one or more sheets of film (18) cut by the cutting assembly (6), and - a mechanism (19) active in the support structure (16) and configured for relative movement of the support structure (16) with respect to the packaging set (8) between a first position, where the support structure (16) is positioned in the cutting set (6), and at at least a second position, wherein the support structure (16) is positioned within said packaging chamber (24) and configured to place at least one sheet of film (18) above said support (4); and a control unit (100) connected to the packaging set (8) and configured to: - command the packaging set (8) to go from the first to the second operating condition and vice versa; - activating the film cutting assembly (6) to cut, outside the packaging chamber, the continuous film (10a) on the cut film sheet (s) (10); - activating the transfer device (7) to position the cut film sheet (s) (18) inside the packaging chamber (24) and above the respective support (4); - synchronize the activation of the transfer device (7) with the passage of the packaging set (8) from the first to the second operating condition; wherein the control unit (100) is further configured to leave the packaging set (8) in a first operating condition in a time sufficient for the support structure (16) of the transfer device (7) to: - position inside the packaging chamber (24) and above the respective support (4) the cut film sheet (s) (10) that was / were cut outside the packaging chamber (24) and , then - exit the packaging chamber (24)
[0002]
2. Apparatus according to claim 1, characterized by the fact that the mechanism (19) includes a transfer actuator (47) active in the support structure (16) and configured to push and pull a support structure (16) along a suitable path to achieve the displacement between said first and second positions.
[0003]
3. Apparatus according to claim 1 or 2, characterized by the fact that it comprises a transport set (3) configured to move one or more supports (4) along a predefined path to the packing set ( 8), the transport set including a conveyor (46) configured to move a pre-fixed number of supports (4) per time, in which the control unit (100) is configured to: - control the conveyor (46) to moving the preset number of supports (4) from a region outside the packaging chamber (24) to a region within the packaging chamber (24), where the support or supports (4) of said pre-fixed number are in alignment vertical with respective film sheets; - synchronize the conveyor (46) so that the movement of the pre-fixed number of supports (4) from the region outside the packaging chamber (24) to the region inside the packaging chamber (24) is forced to occur when the chamber packaging (24) is open in the first condition.
[0004]
Apparatus according to any one of claims 1 to 3, characterized in that it further comprises at least one frame (2) carrying: - the transport set (3), - the packaging set (8), - film supply set (5), - the film cut set (6), comprising at least one blade (14) carried by said frame (2) and active in a position located between said packaging set (8 ) and said film supply set (5), in which the control unit (100) is configured to perform the following cycle: command the transport set (3) to move the said support (4) to the said packaging chamber (24); command the film cutter assembly (6) to cut, from the continuous film, at least one film sheet (18), the cut separating the cut film sheet from the continuous film outside the packaging chamber (24) and occurring before moving said cut film sheet into the packaging chamber (24), control the transfer device (7) to move the cut film sheet (18) from outside into the packaging chamber (24 ) and above the respective support (4), command the upper tool (21) to retain the cut film sheet (18) above, and at a distance, from said support (4), control the packaging set (8) to move from the first to the second operating condition, control the packaging set (8) to firmly fix the film sheet (18) to said support (4).
[0005]
5. Apparatus, according to claim 4, characterized by the fact that in which the cycle in which the control unit (100) is configured to execute comprises also commanding a vacuum air-array (27) to remove air from inside the said hermetically sealed packaging chamber (24) and / or commanding a controlled atmosphere arrangement (30) to inject a gas or mixture of gases into the packaging chamber (24).
[0006]
6. Apparatus, according to claim 4, characterized by the fact that said step of commanding the transfer device comprises the following that the control unit is configured to perform: - control the mechanism (19) and move the structure of support between said first position, where the support structure (16) is positioned outside the packaging chamber (24) in the cutting assembly (6) and receives the cut film sheet, and said second position, in which the support structure (16) is positioned inside said packaging chamber (24) and configured to place the cut film sheet (18) above said support (4).
[0007]
Apparatus according to claim 4 or 6, characterized by the fact that the film supply set (5) comprises a roll of film supported by a roll holder carried by said frame (2), wherein the control unit (100) is configured to control the film supply set to supply the continuous film sheet to the cutter set (6).
[0008]
Apparatus according to any one of claims 1 to 7, characterized in that the packaging chamber (24), in the second operating condition, is hermetically closed.
[0009]
Apparatus according to any one of claims 1 to 8, characterized in that it further comprises at least one of: a vacuum arrangement (27) connected to the packaging chamber (24) and configured to remove gas from said chamber packaging (24); the vacuum arrangement (27) optionally comprising at least one vacuum pump (28) and at least one evacuation tube (29) connecting the interior of said packaging chamber (24) to the vacuum pump (28), the said control unit (100) being further configured to control the vacuum arrangement (27) to remove gas from said packaging chamber (24) at least when the packaging set (8) is in said second operating condition with said packing chamber (24) hermetically closed; and - a controlled atmosphere arrangement (30) connected to the packaging chamber (24) and configured to inject a gas stream into said packaging chamber (24), the controlled atmosphere arrangement (30) optionally comprising at least one device injection (31) and at least one injection tube (32) connecting the inside of said packaging chamber (24) to the injection device (31), said control unit (100) being further configured to control said arrangement of controlled atmosphere (30) to inject said gas stream at least when the packaging assembly (8) is in said second operating condition with said packaging chamber (24) hermetically closed; wherein the controlled atmosphere arrangement (30) is configured to inject gas into the packaging chamber including an amount of one or more of N2, O2 and CO2, which is different from the amount of these same gases when present in the atmosphere at 20 ° C and at sea level (1 atmosphere pressure).
[0010]
10. Apparatus according to claim 9, characterized by the fact that the apparatus includes both the vacuum arrangement (27) and the controlled atmosphere arrangement (30), and in which the control unit (100) is configured to control said controlled atmosphere arrangement (30) to start the injection of said gas stream, or after a pre-set delay of activation of said vacuum arrangement (27), or after a pre-set vacuum level have been reached within said packaging chamber (24), optionally, wherein said control unit (100) is configured to control said controlled atmosphere arrangement (30) to initiate the injection of said gas stream while said gas withdrawal from said packaging chamber is still in progress.
[0011]
11. Apparatus according to any one of claims 1 to 10, characterized by the fact that the packaging set (8) further comprises: - a main actuator (33) active in at least one of said upper and lower tools (21 ; 22), the main actuator (33) being controlled by the control unit (100), - the control unit (100) being configured to act on the main actuator (33) and cause relative movement of the upper and lower tool (21; 22) along a main direction (A5), between said first operating condition, where the upper tool (21) is spaced from the lower tool (22), and said packaging chamber (24) is opened to receive a or more of said film sheets (18), and said second operating condition, where a closing surface (34) of the upper tool (21) abuts firmly against a closing surface (35) of the lower tool (22) for hermetically close the aforementioned packaging (24) with respect to an atmosphere outside the apparatus (1).
[0012]
Apparatus according to any one of claims 1 to 11, characterized in that the upper tool (21) of the packaging set (8) comprises a film retaining plate (36) having a respective active surface (37 ) configured to receive one or more sheets of film (18) and means (38) for retaining one or more sheets of film (18) in correspondence with said active surface (37), said means (38) for retaining comprising one or more of the group of: - a vacuum source (39) controlled by the control unit (100), the control unit (100) being configured to activate the vacuum source (39) and make the retaining plate of film (36) receiving and retaining said one or more sheets of film (18) in correspondence with the active surface (37), - mechanical seals associated with the active surface (37), - adhesive portions associated with the active surface (37), - heatable portions associated with the retaining plate (36) and controlled by the containment unit roll (100) to cause heating of the active surface (37) and thus of the film sheet (18) in order to increase the adhesiveness of the film sheet to the active surface (37), - electrical systems associated with the retaining plate ( 36) and controlled by the control unit (100) to charge the active surface (37) with a predetermined polarity.
[0013]
Apparatus according to claim 12, characterized by the fact that it further comprises a heating structure (40) peripherally associated with the film retaining plate (36) and having a respective heating surface (41) which extends radially outwardly with respect to the active surface (37) of the retaining plate (36), wherein: - at least when the packaging assembly (8) is in said second operating condition, the heating surface (41) of the the heating structure (40) faces an end surface (23a) of said inner wall (23) delimiting a respective one of said seats (23b) in the lower tool (22) and - the heating structure (40) and the film retaining plate (36) are relatively mobile with respect to each other along said main direction (A5), so that the heating surface (41) of the heating structure (40) can be selectively positioned in a position where she n does not contact the film sheet and in a position where it contacts the film sheet (18) positioned above a support (4) located in one of said seats (23b); and - the control unit (100) is configured to control the heating of the heating structure (40) so that the heating surface (41) is brought to at least a first temperature.
[0014]
14. Apparatus according to claim 13, characterized by the fact that it comprises heating means integrated in the film retaining plate (36) and controlled by the control unit (100), the control unit (100) being configured for control the heating means so that the active surface of the film retaining plate (36) is brought to at least a second temperature between 150 ° C and 260 ° C, optionally between 180-240 ° C, more optionally between 200 -220 ° C, where the control unit (100) is configured to independently control the heating means and the heating structure (40) and to independently adjust the first and second temperatures.
[0015]
15. Apparatus according to claim 13 or 14, characterized by the fact that the heating structure (40) comprises one of: - a metallic body incorporating at least one resistive and / or inductive element connected to a power source and the control unit (100) which is configured to control the power supply to supply current to the resistive or inductive element, so as to maintain the temperature of the heating surface (41) within a pre-fixed range around said first temperature, - a metallic wire directly carried by the heating surface (41) of the heating structure (40), the metallic wire being connected to a power source and the control unit (100) which is configured to control the source of energy to supply current to the metal wire during discrete time intervals followed by time intervals when no current supply to the metal wire occurs, in particular when the control unit ole (100) is configured to control the energy source to supply current to the metallic wire when the sealing of the film sheet (18) to the support (4) occurs, - a printed circuit formed on said heating surface (41) of the heating structure (40), the printed circuit being connected to a power source and the control unit (100) which is configured to control the power supply to supply current to the printed circuit during discrete time intervals followed by time when no supply of current to the printed circuit occurs exclusively, in particular when the control unit (100) is configured to control the power source to supply current to the printed circuit when sealing the film sheet (18) to the support (4) occurs.
[0016]
16. Apparatus according to any one of claims 12 to 15, characterized by the fact that the film retaining plate (36) is rigidly coupled to the upper tool (21) and mounted on the latter, so that: - the film retaining plate (36) is not relatively movable with respect to the upper tool (21) at least along said main direction (A5), - the active surface (37) is flush with the lower surface of the lower tool (21 ), and wherein said active surface of the retaining plate is of sufficient size to overlap, optionally completely overlap, with an end surface (23a) of said internal wall (23) delimiting a respective one of said seats ( 23b) on the lower tool (22).
[0017]
Apparatus according to any one of claims 1 to 16, characterized in that the packaging set (8) further comprises at least one side wall (42) movably associated with one of the upper tools (21) or of the lower tool (22), in which: - the side wall (42) has a front surface (43a) configured to abut against an abutment surface (43b) of the other of said upper tool (21) or lower tool ( 22), - the side wall (42) is mounted on the packaging set so that when the packaging set moves from said first to said second operating condition, the side wall (42) moves, correspondingly, from one first position, where the front surface of the side wall (43a) is separated from said abutment surface (43b), so that the packaging chamber (24) is left open to receive one or more of said sheets of film (18) , for a second position, where the surface front of the side wall (43a) closes tightly against said abutment surface (43b) so that said packaging chamber (24) is hermetically closed with respect to an atmosphere outside the apparatus (1), in which the control unit control (100), after the packaging set has reached the second operating condition, it is configured to act on the main actuator (33) and cause an additional relative movement of the upper and lower tools (21; 22) along the main direction (A5), so that the film sheet held in position by the retaining plate (36) is pressed against the rim (4c) of the support (4) and where the additional relative movement causes a retraction of the side wall (42) against the reaction of a contrasting element, which optionally comprises one or more elastic elements (80).
[0018]
18. Apparatus according to any one of claims 1 to 17, characterized in that the lower tool (22) is provided with multiple seats (23b), each to host a corresponding support (4) and in which the tool upper part (21) is provided with a corresponding plurality of retaining plates (36) each for retaining a respective sheet of film (18), the apparatus further comprising - a plurality of distinct support structures (16), each comprising a flat retention surface (17) adapted to receive a respective of said film sheets (18), each of the support structures (16) being movable between at least the cutting set, to catch the respective film sheet (18) , and the interior of the chamber (24), to position the cut film sheet (18) in correspondence with the respective retaining plate (36) of the upper tool (21), - a transfer actuator (47) being active in the structures support (16) for profile to prevent movement of the support structures (16) and, thus, of the cut film sheets (18) of the cutting set (6) into the packaging chamber (24), the transfer actuator (47) being controlled by the control (100) so that to increase a spacing mutually between the support structures (16), before, when or subsequent to the movement of the support structures (16) of the cutting set (6) into the packaging chamber (24).
[0019]
19. Apparatus according to any one of claims 1 to 18, characterized by the fact that for each of said seats (23b), the packaging set (8) comprises: a series of pusher elements (44) adapted for move from a release position, where active portions (45) of the pusher elements (44) are spaced from the active surface (37) of the retaining plate (36), to a latching position, where the active portions (45) of the pusher elements (44) press the edge portions of the cut film sheet (18) against said active surface (37) of the retaining plate (36), wherein said pusher elements (44) include one selected from the group of: - finger-shaped stops mounted articulated to the upper tool (21) and active in correspondence with the corners of said seats, - finger-shaped stops mounted on the lower tool (22), configured to be moved vertically and active in correspondence with can parts of said seats, - oscillating bars mounted on the upper tool (21) and active in correspondence with the lateral edges of said seats, - oscillating bars mounted on the lower tool (22) configured to be moved vertically and active in correspondence with edges side of said seats, optionally at least one pusher actuator active on said pusher elements (44) under the control of said control unit (100) which is configured to activate said pusher actuator and move the pusher elements (44) from said release position to said engagement position and vice versa.
[0020]
20. Process for packaging a product (P) arranged on a support (4), said support (4) having a base wall (4a) and a side wall (4b), said process using an apparatus (1), as defined in any one of claims 1 to 19, the process characterized by the fact that it comprises the following steps: - unrolling a film (10a) from the roll (10), - cutting across an unrolled portion of continuous film (10a) and preparing one or more cut film sheets (18), the cut separating the cut film sheet from the continuous film outside the packaging chamber (24) and occurring before moving said cut film sheet into the packaging chamber (24), - moving one or more cut film sheets (18) into the packaging chamber (24), - progressively moving a series of supports (4) into the packaging chamber (24) of a packaging set (8), - keep the packaging chamber (24) open long enough for a series of supports (4) and p for a corresponding number of film sheets (18) to be properly positioned within said packaging chamber (24), - close the packaging chamber (24) with the film sheets kept above the respective support (4) optionally at a distance enough to allow gas to circulate inside the support (4), - heat seal the film sheet (18) to said support (4), - open the packaging chamber (24), - move the support (4) with the sheet of film firmly attached (18) out of the packaging chamber (24).
[0021]
21. Process according to claim 20, characterized by the fact that the closing of the packaging chamber comprises hermetically closing the packaging chamber, and after hermetically closing the chamber, causing one or both of: a withdrawal of gas from the packaging chamber hermetically sealed package (24) and gas injection of a gas mixture of controlled composition.
[0022]
22. Process according to claim 20 or 21, characterized by the fact that the cutting of the film (10a) in cut film sheets (18) takes place in the cutting set (6) outside the packaging chamber (24) and remote to the packaging chamber where the film sheets are attached to the supports.
[0023]
23. Process according to any one of claims 20 to 22, characterized in that the support (4) comprises a horizontal ring (4c) emerging radially from said side wall (4b), in which the film sheet ( 18) is cut to a size identical to that of the outer rim of the rim (4c), or to a size radially smaller than the outer rim of the rim (4c), but sufficient to firmly close the mouth of the tray (4) and engage sealed the upper surface of the rim (4c).
[0024]
24. Process according to any one of claims 20 to 23, characterized by the fact that it comprises the steps of removing gas from the hermetically sealed packaging chamber (24) up to a pressure between 10 kPa and 30 kPa (100 and 300 mbar), optionally between 15 kPa and 25 kPa (150 and 250 mbar), be reached inside said chamber and packaging (24) and then - while the film sheet (18) is kept at a distance of one support mouth - inject a modified atmosphere gas injected into the packaging chamber (24), in which the injection of said gas stream to create a modified atmosphere, occurs while the gas withdrawal is still in progress, in order to shorten the time to create the modified at-mosphere.
[0025]
25. Process, according to claim 24, characterized by the fact that after the gas removal or gas injection step, the process includes a step of uniformly heating the film sheet (18) in case the film sheet will not be hot shrinkable or heat at least a peripheral portion (18b) of the film sheet (18) if the film is hot shrinkable and then bring the film sheet (18) close to the support (4) and connect it firmly to the support ring (4c).

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同族专利:

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公开号 | 公开日

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KR20150140673A|2015-12-16|

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EP3028837B1|2017-07-12|

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WO2014166940A1|2014-10-16|

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RU2015144087A|2017-05-15|

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RU2656472C2|2018-06-05|

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RU2018118213A3|2021-08-26|

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AU2014253214B2|2018-07-19|

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MX2019007695A|2019-09-06|

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PL3028837T3|2017-11-30|

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ES2643383T3|2017-11-22|

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AU2017258887B2|2018-12-06|

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RU2018118213A|2018-11-02|

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CN105163927A|2015-12-16|

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NZ713535A|2018-04-27|

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US20160068288A1|2016-03-10|

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AU2014253214A1|2015-11-05|

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CN105163927B|2018-06-01|

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EP2983894B1|2017-10-18|

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EP3028837A1|2016-06-08|

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MX2015014135A|2015-12-15|

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PL2983894T3|2018-03-30|

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ES2654629T3|2018-02-14|

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EP2983894A1|2016-02-17|

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NZ736438A|2019-06-28|

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RU2015144087A3|2018-03-23|

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MX366085B|2019-06-27|

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AU2014253214A2|2016-08-11|

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US11214394B2|2022-01-04|

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BR112015025753A2|2017-07-18|

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KR102256849B1|2021-05-27|

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AU2017258887A1|2017-11-30|

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法律状态:
2018-02-27| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-12-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-02-02| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-04-13| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 08/04/2014, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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EP13162952|2013-04-09|

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EP13162952.9|2013-04-09|

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PCT/EP2014/057034|WO2014166940A1|2013-04-09|2014-04-08|Apparatus and process for packaging a product|

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