• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Multiple packaging; that defines a series of containers (11) formed in a sheet (L) of plastic material that comprises at least one layer of PET (polyethylene terephthalate), and in which said containers (11) are joined by bridges (12), provided with an upper pre-cut line (13) and a lower pre-cut line (14) for breaking the bridge (12). The upper pre-cut line (13) and the lower pre-cut line (14) are arranged in parallel, laterally separated in a horizontal direction and vertically separated, to avoid compression heating and variation of the properties of the layer of PET, allowing a clean breakage of the bridge by rotating the containers with respect to said upper and lower pre-cut lines. The invention also comprises a machine for manufacturing the multipack. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2786824A1
    申请号:ES201930324
    申请日:2019-04-10
    公开日:2020-10-13
    发明作者:Manuel Gonzalez
    申请人:Industrias Tecnologicas de Mecanizacion y Automatizacion SA；
    IPC主号:
    专利说明:

    [0002] Multiple packaging and machine for its manufacture
    [0004] Field of application of the invention.
    [0006] This invention is applicable in the field dedicated to the manufacture of multiple packages intended for the food sector and in particular to the packaging of food products, such as yogurts, custards, custards or the like.
    [0008] State of the art.
    [0010] In the manufacture of containers for the food industry, it is common to form multiple containers, using a sheet, monolayer or multilayer, of plastic material. These multiple packages have several cavities or individual packages that remain joined by connecting bridges defined in the plastic sheet itself.
    [0012] Once filled and closed, the containers are subjected to a cutting operation in which a part of the contour of the containers is defined, and a pre-cutting operation in which pre-cutting lines are defined that affect the joining bridges and that facilitate the subsequent breaking and separation of the different individual packages that make up the multiple package.
    [0014] Typically, the materials used for the manufacture of food packaging are thermoplastic polymers, although polystyrene (PS) is the most used material for the manufacture of thermoformed containers.
    [0016] The most important producers of yogurts and desserts are determined to change the current PS (polystyrene) for PET (polyethylene terephthalate), since the latter is 100% recyclable and reusable.
    [0018] However, nowadays there is no solution to the pre-cutting of the bridges between PET containers, which allows the separation of the containers in the traditional way, such as and how it is done with PS material, that is, turning the containers to be separated in a direction perpendicular to the pre-cut line.
    [0020] Some pre-cut systems have applied, without success, the technologies used in polystyrene (PS) pre-cut lines in containers that comprise at least one layer of polyethylene terephthalate (PET), without a good quality result. , since the properties of PET force the consumer to perform the partition by means of a rotation of the containers, causing a faulty cut, with badly cut parts, in the form of protruding battlements, being a danger for the consumer due to the possibility of cutting.
    [0022] In patent FR 3022818 A1, the cutting and pre-cutting operations are carried out by means of a die provided with a lower die, and a punch-holder plate that incorporates blades that partially protrude from said plate to carry out the pre-cuts punch holders and that only perform a creasing or pre-cutting line on the upper face of the container.
    [0024] In patents US 2014366694 A1 and ES 222926T T3 devices for cutting plastic material are described, provided with upper blades and lower blades facing each other to make pre-cutting lines on opposite faces of the material.
    [0026] The problem with these devices is that during the actuation of the pre-cutting blades, which are facing each other, a crushing occurs in the core of the material to be cut, since PET is amorphous. This crushing produces an increase in temperature in the core of the material, causing the molecular structure of the PET material to change, transforming it into a more elastic material, which accentuates the classic hinge effect of PET, thereby breaking the bonding bridges and separating the containers, it is necessary to apply rotational movements to the containers in opposite directions, also leaving in the pre-cut zone an irregular surface that is dangerous for the consumer.
    [0028] The technical problem that arises is the development of a multiple container, provided with a series of individual containers, formed in a sheet of plastic material that comprises at least one layer of PET (polyethylene terephthalate), and in which said Containers are joined by connecting bridges that have an upper pre-cut line and a lower pre-cut line for breaking the bridge and separating the containers, and that present adequate characteristics to obtain a clean break of the containers. bridges along the pre-cut lines, without defining irregular projections, and carrying out the same movement that is currently carried out for the separation of the PS (polystyrene) containers; that is to say; rotating the containers with respect to the pre-cut line, and without the need to rotate the containers in opposite directions.
    [0030] This invention also includes a thermoforming machine, of the FFS type (Form, Fill & Seal) or similar, and with specific characteristics for the manufacture of said multiple container.
    [0032] Description of the invention.
    [0034] The multiple package of this invention is made up of a sheet of plastic material that comprises at least one layer of PET (polyethylene terephthalate). Said multiple package comprises a series of individual packages joined by connecting bridges of a predetermined thickness, defined in the sheet of plastic material itself; said connecting bridges comprising an upper pre-cut line and a lower pre-cut line for breaking the bridge and separating the individual packages.
    [0036] This container presents, with regard to the upper and lower pre-cut lines, characteristics aimed at solving the aforementioned problems, providing a clean break in the joining bridges of the containers formed by a PET sheet or incorporating at least a PET sheet, by turning the containers to be separated in a direction substantially perpendicular to said pre-cut lines and without the need to rotate the containers in opposite directions.
    [0038] For this, and in accordance with the invention, the upper pre-cut line and the lower pre-cut line are arranged in parallel, laterally spaced, in a horizontal direction, at a distance between 45% and 55% of the thickness of the bridge; and vertically separated by a distance between 12% and 26% of the thickness of the bridge.
    [0039] With the indicated separations, the fibers of the PET material have enough space not to be compressed during the execution of the upper and lower pre-cut lines; preventing crushing and an increase in the temperature of the core of the material and modifying the molecular structure of the PET material, making it more elastic; therefore the PET material retains its initial properties and can be easily and uniformly broken to separate the individual containers along the pre-cut lines, simply by applying a turning movement to said containers in a direction perpendicular to the pre-cut lines .
    [0041] This solution allows obtaining the same results in the pre-cutting of PET containers, as those obtained with PS material, simply by changing the cutting tool on the container thermoforming machine.
    [0043] Preferably, given the application to which this multiple pack is intended, the thickness of the material that makes up the bridge and in which the upper and lower pre-cut lines are defined, is between 0.7 and 1.3 millimeters, which provides the container with an adequate consistency without excessive oversizing of the material thickness.
    [0045] This invention also includes a machine for the manufacture of multiple packages, with the characteristics mentioned above, and the characteristics of which are collected in the attached claims.
    [0047] Said machine comprises: a lower die associated with a vertical displacement press; a punch holder plate and a pre-cut device comprising an upper pre-cut blade associated with the punch holder plate and a lower pre-cut blade associated with the lower die, for the definition of the container junction bridges individual lines of the upper pre-cut and lower pre-cut lines, suitable for breaking said bridges and separating the individual containers made of PET or incorporating at least one layer of PET.
    [0049] According to the invention, the upper pre-cut blade and the lower pre-cut blade are parallel and are laterally separated, in the horizontal direction, by a distance between 0.315 and 0.715 millimeters, this separation being suitable for making the pre-cut lines in the bridges of the multipack without the PET fibers being compressed, heated in the core of the bridge and modifying its physical properties.
    [0051] Preferably, the upper pre-cutting blade is mounted with the possibility of vertical movement relative to a floating stop that is enabled for limited vertical movement relative to the punch holder plate; said floating stop being mounted on first calibrated springs and the upper pre-cutting blade on second calibrated springs.
    [0053] Said calibrated springs provide a sufficient thrust for the upper pre-cutting blade to penetrate the bridge of the multipack when said multipack is pushed vertically and upwards, that is to say towards the punch holder plate.
    [0055] Preferably, the relative displacement of the upper pre-cut blade with respect to the floating stop, and the penetration of the upper pre-cut blade in the plastic material is between 0.42 and 0.91 millimeters, which is suitable for define an upper pre-cut line of the depth specified on the container described above.
    [0057] In a preferred embodiment, the lower pre-cut blade protrudes from the lower die by a distance of between 0.098 and 0.234 millimeters, said lower die forming a penetration stop for the lower pre-cut blade in the material forming the bridge of the packaging.
    [0059] Description of the figures.
    [0061] To complement the description that is being made and in order to facilitate the understanding of the characteristics of the invention, the present specification is accompanied by a set of drawings in which, by way of illustration and not limitation, the following has been represented:
    [0063] - Figure 1 shows a schematic plan view of a multiple package, according to the invention, made of PET.
    [0064] - Figure 2 shows an elevation view of the multiple container of the previous figure, sectioned along a vertical plane, and an enlarged detail of an area of the bridge in which the arrangement of the upper and lower pre-cut lines can be observed .
    [0066] - Figure 3 shows an elevation view of two of the individual containers of the multiple PET container of the previous figures and the turning movement to be applied on them, in a direction perpendicular to the pre-cut lines, to achieve breakage of the bridge and the separation of said individual packages.
    [0068] - Figures 4a, 4b and 4c show respective partial elevation views, and sectioned along a vertical plane, of the machine for manufacturing the multiple package of Figures 1 to 3, and respective enlarged details in which the device can be seen of pre-cut in three different and successive positions during the realization of the lower and upper pre-cut lines.
    [0070] Preferred embodiment of the invention.
    [0072] In the exemplary embodiment shown in Figures 1 and 2, a multiple package (1) according to the invention can be seen, formed by a sheet (L) of plastic material which in this case is made up of a layer of PET (terephthalate polyethylene).
    [0074] This multiple package (1) comprises a series of individual packages (11) joined together by bridges (12) of a predetermined thickness (e) and formed by the PET sheet (L) itself.
    [0076] In this specific example, the thickness (e) of the bridge is between 0.7 and 1.3 millimeters.
    [0078] As seen in the enlarged detail of figure 2, the bridge (12) comprises an upper pre-cut line (13) and a lower pre-cut line (14) arranged in parallel, laterally spaced in a horizontal direction by a distance (d1) comprised between 45% and 55% of the thickness (e) of the bridge, and vertically separated by a distance (d2) comprised between 12% and 26% of the thickness (e) of the bridge (12).
    [0080] In a specific embodiment, the thickness of the material that makes up the bridge (12) is 1 millimeter, and the upper and lower pre-cut line (13, 14) are horizontally separated by a distance (d1) of 0.5 millimeters. . and vertically over a distance (d2) of 0.19 millimeters.
    [0082] With the indicated characteristics, it is avoided that the compression of the material, the definition of the pre-cut lines, produces the heating of the PET fibers in the core area and the modification of its physical properties, with which it is achieved that the material PET maintains its properties and that a clean break of the multiple container (1) is obtained through the said pre-cut lines, simply turning the containers (11) in a direction perpendicular to the pre-cut lines, as shown in Figure 3, and as if it were a polystyrene (PS) container.
    [0084] Figures 4a-4c partially represent a machine with a formed item, suitable for manufacturing the multiple package described above, provided with a device for pre-cutting the bridge of the packages.
    [0086] Said machine is of the type that comprises: a lower die (2) associated with a vertical displacement press (not represented); a punch holder plate (3) and a pre-cutting device comprising: an upper pre-cut blade (31) associated with the punch holder plate (3) and a lower pre-cut blade (21) associated with the lower matrix (2), for the definition in the bridges (12) of union of the containers (11) of the lines of pre-cut (13, 14) superior and inferior suitable for the breaking of said bridges (12) and the separation of containers (11).
    [0088] According to the invention, the upper pre-cut blade (31) and the lower pre-cut blade (21) are parallel and are laterally separated, in a horizontal direction, by a distance between 0.315 and 0.715 millimeters, which allows define in the bridge (12) of the multiple package (1), the upper and lower pre-cut lines (13, 14) with a horizontal separation between 45% and 55% of the thickness (e) of the bridge (12 ).
    [0090] The upper pre-cut blade (31) is mountable mounted vertical relative to a floating stop (32) made possible of limited vertical movement with respect to the punch-holder plate (3).
    [0092] Said floating stop (32) is mounted on first calibrated springs (33) and the upper pre-cut blade (31) on second calibrated springs (34).
    [0094] The relative displacement of the upper pre-cut blade (31) with respect to the floating stop (32) and the penetration of said upper pre-cut blade (31) in the plastic material is between 0.42 and 0.91 millimeters
    [0096] In turn, the lower pre-cut blade (21) protrudes from the lower die (2) in a distance between 0.098 and 0.234 millimeters, said lower die (2) forming a penetration stop for the pre-cut blade bottom (21) in the material forming the bridge (12) of the containers (11).
    [0098] The upper pre-cut blade (31) and the lower pre-cut blade (21) have first parallel and vertical faces, and second oblique faces, divergent in opposite directions, moving away from the other pre-cut blade. opposite. This configuration minimizes the pressure exerted by the blades on the PET fibers in the area between the two blades.
    [0100] The operation of the mentioned cutting device, represented in figures 4a-4c is as follows:
    [0102] The lower die (2) acts by means of a plunger (not referenced) against the material to produce the cut of the lower pre-cut blade (21) and the subsequent displacement of the upper pre-cut blade (31).
    [0104] The upper pre-cutting blade (31) moves as far as the floating stop (32) allows, thus achieving the exact proportions for the different proposed cutting percentages and with the particularity that all the blades involved in a Device with these characteristics are individual and have the same behavior, since it is the thickness of the material that limits the pre-cuts through the lower die clamp (2) and the floating stop (32).
    [0105] In order to obtain the results described, a drive system has been developed, which ensures that in multi-pre-cut elements each and every one of them are exactly the same in their realization, regardless of the flatness of the machine system and tolerance. in material thickness.
    [0107] The lower die (2) and the lower pre-cut blade (21) are vertically displaced by the movement of the machine press, lifting the PET sheet (L) against the floating stop (32) which is supported in position by the first calibrated springs (33) to support the cutting force necessary for the lower pre-cut blade (21) to penetrate the material making the lower pre-cut line (14). Due to the upward movement of the cutting press, the floating stop (32) is vertically displaced, compressing the first calibrated springs (33) and moving upwards by a suitable distance for the indicated penetration of the upper pre-cut blade (31) on the sheet material (L) and the definition of the upper pre-cut line (13).
    [0109] The upper pre-cut blade (31) is also mounted on second calibrated springs (34) that allow the simultaneous movement of the upper pre-cut blade (31) and the floating stop (32) to absorb the tolerances in flatness of the system, ensuring an equal pre-cut throughout the device.
    [0111] Once the nature of the invention has been sufficiently described, as well as an example of a preferred embodiment, it is stated for the appropriate purposes that the materials, shape, size and arrangement of the elements described may be modified, as long as this does not imply an alteration of the essential characteristics of the invention that are claimed below.
    权利要求:
    Claims (7)
    [1]
    1. Multiple packaging; that defines a series of containers (11) formed in a sheet (L) of plastic material that comprises at least one layer of PET (polyethylene terephthalate), and in which said containers (11) are joined by bridges (12) , of predetermined thickness (e), defined in the plastic sheet (L) itself; said bridges (12) comprising an upper pre-cut line (13) and a lower pre-cut line (14) for breaking the bridge (12) and separating the containers (11); characterized in that the upper pre-cut line (13) and the lower pre-cut line (14) are arranged in parallel, laterally separated, in a horizontal direction, over a distance (d1) comprised between 45% and 55% the thickness (e) of the bridge; and vertically separated by a distance (d2) comprised between 12% and 26% of the thickness (e) of the bridge.
    [2]
    2. - Multiple packaging according to claim 5, characterized in that the thickness of the bridge material is between 0.7 and 1.3 millimeters.
    [3]
    3. - Machine for manufacturing the multiple packaging of the preceding claims; comprising: a lower die (2) associated with a vertical displacement press; a punch holder plate (3) and a pre-cutting device comprising an upper pre-cut blade (31) associated with the punch holder plate (3) and a lower pre-cut blade (21) associated with the die lower (2), for the definition in the bridges (12) of union of the containers (11) of an upper pre-cut line (13) and a lower pre-cut line (14) suitable for breaking said bridges (12) and separation of containers (11); characterized in that the upper and lower pre-cutting blades (31, 21) are parallel and are laterally spaced, in a horizontal direction, by a distance between 0.315 and 0.715 millimeters.
    [4]
    4. - Machine according to claim 3, characterized in that the upper pre-cutting blade (31) is mounted with the possibility of vertical displacement relative to a floating stop (32) made possible of limited vertical displacement with respect to the punch holder plate (3 ); said floating stop (32) being mounted on first calibrated springs (33) and the upper pre-cutting blade (31) on second calibrated springs (34).
    [5]
    5. - Machine according to claim 4, characterized in that the relative displacement of the upper pre-cut blade (31) with respect to the floating stop (32), and the penetration of the upper pre-cut blade (31) in the plastic material is between 0.42 and 0.91 millimeters
    [6]
    6. - Machine according to any one of claims 3 to 5, characterized in that the lower pre-cutting blade (21) protrudes from the lower die (2) in a distance between 0.098 and 0.234 millimeters, forming said lower die ( 2) a stop for penetration of the lower pre-cutting blade (21) into the material forming the bridge (12) of the containers (11).
    [7]
    7. - Machine according to any one of claims 3 to 6, characterized in that the upper pre-cut blade (31) and the lower pre-cut blade (21) have first parallel and vertical faces, and second oblique faces, divergent in opposite directions, moving away from the opposite pre-cutting blade (21, 31).
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    同族专利:
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    CN111573004B|2022-03-08|
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    ES2786824B2|2021-05-11|
    JP2020172337A|2020-10-22|
    BR102020007047A2|2020-10-20|
    US20200324431A1|2020-10-15|
    DK3722217T3|2022-02-21|
    EP3722217A1|2020-10-14|
    CN111573004A|2020-08-25|
    KR20200120545A|2020-10-21|
    EP3722217B1|2022-01-26|
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    法律状态:
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    优先权:
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