• 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:
    There is provided a system for packaging objects on a conveyor using a tubular plastic film. More specifically, the invention provides a system, wherein the tubular plastic film can be wrapped around the objects in a horizontal manner.
    公开号:DK201770655A1
    申请号:DKP201770655
    申请日:2017-08-30
    公开日:2019-03-11
    发明作者:Bruhn Frank
    申请人:Frank Bruhn Aps；
    IPC主号:
    专利说明:

    PACKAGING SYSTEM AND METHOD FOR PACKAGING OBJECTS
    FIELD OF THE INVENTION
    The invention relates to a system and method for continuously packaging multiple objects on a conveyor using a tubular plastic film. More specifically, the invention provides a system, wherein the tubular plastic film can be wrapped around long objects.
    BACKGROUND OF THE INVENTION
    It is already known to package objects, including compressible objects, by completely or partially manual operations, wherein the objects are introduced into a premanufactured, bag-shaped plastics film, i.e. a bag, prior to packaging. In some cases the bag-shaped plastics films can be advanced automatically to the operator from a stack; and likewise the objects may be advanced to the site of packaging by means of belt conveyors etc. Manual operations are cost-intensive and likewise the capacityeven that of automatic auxiliary equipment-is limited. The latter means that the execution of the operations becomes very space-intensive. The manual handling of the bags can be replaced by an automated handling only with difficulty since it is difficult to detect corners, rims and edges accurately to enable accurate seizure of the bags. Unless the bags are seized accurately there is a risk of them being damaged during the handling procedure.
    Stretch packaging aims to give protection to a stack of goods during transport against humidity and other environmental influences. The wrapping with a foil hood ensures stability to the packed goods.
    Prior art systems are generally used for the purposes of wrapping up a product, which is arranged for the most part on a pallet, at least in part with a tubular film in a packaging machine. This serves to stabilize the product and to provide protection
    DK 2017 70655 A1 against the surroundings. The tubular film may be configured as a hood that is closed at the top or as a band that is open at the top and the bottom.
    Prior art systems utilize a tubular film portion matching the size of the product and the systems basically unroll a portion of the film onto gathering fingers which are fastened to a frame. A gathering drive unit is then moved into contact with the tubular film portion such that an operative connection is created. By driving the gathering roller, the tubular film portion is gathered-up onto the individual gathering fingers such that a film store laid in folds is formed on the respective gathering finger. Once the tubular film portion has been gathered-up, the gathering fingers are driven in a substantially horizontal manner such that the tubular film portion is expanded or stretched. Expanding or stretching refers to a state where an elastic or elastic-plastic deforming of the tubular film occurs. The gathering fingers are then driven in a vertical manner along the product. At the same time the tubular film is released from the gathering fingers and the product is wrapped up therein as a result of the elastic resiliency of the tubular film portion.
    Such systems are used for example in hood packaging installations. These may be installations which operate on the basis of what is known as the hood stretching process or the hood shrinking process. Both processes are distinguished by the fact that a portion of a tubular film is pulled or pushed over any desired cargo, or that the cargo is introduced into the portion of tubular film by means of a lifting table. This is referred to hereafter as wrapping of cargo.
    In the case of most hood packaging installations, the portion of tubular film is first reefed by means of a reefing device, to then be slipped over the cargo by the reefing device or by a separate drawing-over device and thereby unreefed. During the reefing, a supply of portions of tubular film laid in folds, which is also referred to hereafter as a film store, is formed at the bottom of the reefing fingers. If the reefing device is also used for the drawing over, the reefing device is moved in relation to the cargo, possibly after stretching the portion of tubular film. During this relative movement, the portion of tubular film is pulled off from the reefing fingers, is also referred to as unreefed.
    US5024042 discloses a system for packaging objects in hose-shaped foil which comprises a movable packaging frame having a plurality of horizontally arranged
    DK 2017 70655 A1 gripping arms for holding and stretching the foil, a conveyor for supporting objects and transporting it towards the packaging frame, so that the object is delivered between the gripping arms. US502402 does not disclose gripping arms equipped with opposing and activated rollers and that a second conveyor is positioned next to the packaging frame, where the second conveyor transports the packaged object away from the packaging frame.
    EP0652156 discloses a machine for packaging a number of food casing strands in film, which is tubular and made of plastics. The packaging method comprises that the film is transferred to transport means while forming a number of wrinkle shaped folds. The film positioned on the transport means is then cut off from the remaining part of the film, following which the open ended tubular film is stretched and arranged to receive the food casing strands. The objects are then transferred into the stretched tubular plastic film in such a manner that the film is gradually pulled off because the diameter of the group of food casing strands is larger than the diameter of the open end in the tubular film. Finally the opposite end of the tubular film package with the food casings strands is closed.
    US3798872 discloses an apparatus for manually stuffing foodstuff into tubular netting. The apparatus comprises an immobile stuffing tubular element, a slideable blade onto which the food stuff is placed. The netting is gathered exterior to the tubular element by a net gathering carry and the foodstuff is thereafter slid into the stuffing tubular element. The foodstuff is thereafter pushed out of the tubular element by a pneumatic system comprising a piston, and the gathered netting would be pulled over the food stuff. Thereafter the netting can be cut by cutting means and the food would be stuffed into the netting.
    WO2016070883 discloses a system for packaging objects on a conveyor using a hoseshapedstretch foil. More specifically, W02016070883 discloses a system, wherein the hoseshaped stretch foil can be wrapped around objects in a horizontal manner.
    There is a need to improve the existing systems by reducing the size thereof and by decreasing the packaging time and complexity. In particular there is a need to improve the efficiency of packaging objects in hose-shaped enclosures.
    DK 2017 70655 A1
    SUMMARY OF THE INVENTION
    The system according the present invention differs from the systems described above in that wrapping is achieved horizontally instead of vertically. Several technical features are essential to achieve horizontal wrapping and the system is characterized by a higher production cycle and hence a higher efficiency.
    Thus, in a first aspect the present invention concerns a system for packaging objects with a tubular plastic film, said system comprises:
    • a movable gripping unit having a plurality of horizontally oriented gripping arms for holding and releasing the tubular plastic film onto an object;
    • a first conveyor for supporting the object and transporting it toward the gripping unit in an axis parallel with the gripping arms so that the object is delivered between the gripping arms;
    • a second conveyor for supporting the object and transporting it away from the gripping unit, said second conveyor placed next to the gripping unit, which during packaging is placed between the first and second conveyors;
    • elements adapted for cooperating with each other for temporarily holding the film, said elements enclosing a cutting device and a welding device; and • a control unit.
    The inventors have surprisingly found that when applying the elements adapted for cooperating with each other for holding the film encloses the welding and cutting device then several objects may be packaged in a row.
    The elements adapted for cooperating with each other for holding the film preferably comprise a set of reciprocating elements that can be forced together in order to press against the outer surface of the film, while the cutting device and welding device, which is placed between the set of reciprocating elements, cuts and welds the film thereby generating two closed ends.
    DK 2017 70655 A1
    In a particularly preferred embodiment of the present invention the control unit is programmed to execute the following steps:
    • loading the movable gripping unit with tubular plastic film;
    • directing the movable gripping unit to be placed between the first and second conveyors, whereby the gripping arms are positioned axially with the conveyors;
    • activating the first conveyor to transport the object toward the movable gripping unit, wherein the object moves along and in between the gripping arms;
    • activating the gripping unit to release film from the gripping arms onto the object while the object moves towards the second conveyor;
    • set of reciprocating elements that can be forced together in order to press against the outer surface of the film, while the cutting device and welding device, which is placed between the set of reciprocating elements, cuts and welds the film thereby generating two closed ends; and • moving the object with closed ends to the second conveyor to transport the packaged object away from the gripping unit.
    In order to reduce the time for loading tubular film onto the gripping arms the movable gripping unit is preferably loaded with tubular plastic film for packaging at least 3 objects, more preferably for packaging at least 5 objects, and most preferably for packaging at least 10 objects.
    In one embodiment the system is configured to accommodate a long object by consecutively releasing tubular film segments along the object, said segments overlapping each other along the length of the object.
    The present invention also provides a method for packaging objects tubular film with the system of the present invention, said method comprises the steps of:
    • loading the movable gripping unit with tubular plastic film;
    • directing the movable gripping unit to be placed between the first and second conveyors, whereby the gripping arms are positioned axially with the conveyors;
    • activating the first conveyor to transport the object toward the movable gripping unit, wherein the object moves along and in between the gripping arms;
    • activating the gripping unit to release film from the gripping arms onto the object while the object moves towards the second conveyor;
    DK 2017 70655 A1 • set of reciprocating elements that can be forced together in order to press against the outer surface of the film, while the cutting device and welding device, which is placed between the set of reciprocating elements, cuts and welds the film thereby generating two closed ends; and • moving the object with closed ends to the second conveyor to transport the packaged object away from the gripping unit.
    The present invention also provides an apparatus comprising the set of reciprocating elements that can be forced together in order to press against the outer surface of the film, while the cutting device and welding device, which is placed between the set of reciprocating elements, cuts and welds the film thereby generating two closed ends. This apparatus is suitable for being implemented in both the system for packaging objects of the present invention as well as prior art packaging machines.
    BRIEF DESCRIPTION OF THE DRAWINGS
    FIG. 1 shows a sectional view of the elements adapted for cooperating with each other for temporarily holding the film, said elements enclosing a cutting device and a welding device.
    FIG. 2 shows the packing of long objects.
    FIG. 3 shows a prior art example of a system for packaging objects with a tubular plastic film.
    DETAILED DESCRIPTION OF THE INVENTION
    Identical components are given the same designations in the text which follows and are provided with the same reference signs in the drawings.
    Figure 1 shows a sectional view of the elements (10) adapted for cooperating with each other for temporarily holding the film (11), said elements (10) enclosing a cutting device (12) and a welding device (13). The steps carried out by the present invention includes
    DK 2017 70655 A1 the loading of the gripping unit (2) with tubular plastic film (11); directing the gripping unit (2) to be placed between the first (5) and second (6) conveyors, whereby the gripping arms (3) are positioned axially with the conveyors (5, 6); activating the first conveyor (5) to transport the object (7) toward the gripping unit (2), wherein the object (7) moves along and in between the gripping arms (3); activating the gripping unit (2) to release film (11) from the gripping arms (3) onto the object (7) while the object (7) moves towards the second conveyor (6); activating the set of reciprocating elements (10) thereby forcing them together in order to press against the outer surface of the film (11) , while the cutting device (12) and welding device (13), which is placed between the set of reciprocating elements (10), cuts and welds the film (11) thereby generating one or two closed ends; and moving the object (7) with closed ends to the second conveyor (6) to transport the packaged object (7) away from the gripping unit (2).
    Figure 2 shows the packing of long objects. According to the invention it is achieved by configuring the gripping unit to accommodate a long object (7) by consecutively releasing two tubular film (11) segments along the object (7). Importantly these segments overlap with each other along the length of the object (7) and may be held in place by gluing or by a band, such as a strip.
    Figure 3 shows a prior art system (1), which is also applicable for performing the present invention. The system includes a movable packaging frame (2) having four horizontally oriented gripping arms (3) for holding and stretching tubular (stretchable) film (11). A rail system is used for moving the packaging frame from film storage and dispensing means (4) to the area between the first (5) and second (6) conveyors. In the shown embodiment two packaging frames and two film storage and dispensing means are provided; in such a configuration one of the packaging frames may be gathering stretch foil while the other is ungathering stretch foil onto the object to packaged. Each gripping arm is equipped with opposing and activated rollers which can be brought into contact with the film, whereby activation of the rollers enable the film to be gathered onto and ungathered from the gripping arms. The gripping arms are independently and laterally movable to achieve stretching of the film. There is shown a first conveyor for supporting the object and transporting it toward the packaging frame so that the object is delivered between the gripping arms. This first conveyor transports the object perpendicular to the packaging frame and in an axis parallel with the gripping arms.
    DK 2017 70655 A1
    The second conveyor, which is placed next to the packaging frame, supports the object and transports it away from the packaging frame.
    权利要求:
    Claims (14)
    [1] 1. A system (1) for packaging objects with a tubular plastic film, said system comprises:
    • a gripping unit (2) having a plurality of horizontally oriented gripping arms (3) for holding the tubular plastic film (11) and for releasing it onto an object (7);
    • a first conveyor (5) for supporting the object (7) and transporting it toward the gripping unit (2) in an axis parallel with the gripping arms (3) so that the object (7) is delivered between the gripping arms (3);
    • a second conveyor (6) for supporting the object (7) and transporting it away from the gripping unit (2), said second conveyor (6) placed next to the gripping unit (2), which during packaging is placed between the first (5) and second conveyors (6);
    • elements (10) adapted for cooperating with each other for temporarily holding the film (11), said elements enclosing a cutting device (12) and a welding device (13), said elements (10) positioned at the end of the first conveyor (5); and • a control unit.
    [2] 2. System according to claim 1, wherein the elements (10) adapted for cooperating with each other for holding the film comprise a set of reciprocating elements (10) that can be forced together in order to press against the outer surface of the film (11), while the cutting device (12) and welding device (13), which is placed between the set of reciprocating elements (10), cuts and welds the film (11) thereby generating two closed ends.
    [3] 3. System according to claim 1 or 2, wherein an additional welding device (13’) is adopted between the elements (10) adapted for cooperating with each other for holding the film, said welding device (13) and said additional welding device (13’) flanking the cutting device (12).
    [4] 4. System (1) to any one of the claims 1 to 3, wherein the control unit is programmed to execute the following steps:
    • loading the gripping unit (2) with tubular plastic film (11);
    • ensuring that the gripping unit (2) is placed between the first (5) and second (6) conveyors, whereby the gripping arms (3) are positioned axially with the conveyors (5, 6);
    DK 2017 70655 A1 • activating the first conveyor (5) to transport the object (7) toward the gripping unit (2), wherein the object (7) moves along and in between the gripping arms (3);
    • activating the gripping unit (2) to release film (11) from the gripping arms (3) onto the object (7) while the object (7) moves towards the second conveyor (6);
    • activating the set of reciprocating elements (10) thereby forcing them to press against the outer surface of the film (11), while the cutting device (12) and welding device (13), which is placed between the set of reciprocating elements (10), cuts and welds the film (11) thereby generating a closed end in the film (11) covering the object (7); and • moving the object (7) with closed ends to the second conveyor to transport the packaged object away from the gripping unit.
    [5] 5. System according to any one of the claims 1 to 4, wherein the gripping unit (2) is loadable with tubular plastic film (11) for packaging at least 3 objects (7).
    [6] 6. System according to any one of the claims 1 to 5, wherein the gripping unit (2) is movable.
    [7] 7. System according to claim 6, wherein the gripping unit (2) is movable, such as on a track, between a station for loading the gripping unit (2) and the space between the first (5) and second (6) conveyors, where packaging of the object (7) is performed.
    [8] 8. System according to any one of the claims 1 to 7, wherein the system is configured to accommodate a long object (7) by consecutively releasing two tubular film (11) segments along the object (7), said segments overlapping each other along the length of the object.
    [9] 9. Method for packaging objects tubular film (11) with the system of any one of the claims 1 to 8, said method comprises the steps of:
    • loading the gripping unit (2) with tubular plastic film (11);
    DK 2017 70655 A1 • directing the gripping unit (2) to be placed between the first (5) and second (6) conveyors, whereby the gripping arms (3) are positioned axially with the conveyors (5, 6);
    • activating the first conveyor (5) to transport the object (7) toward the gripping unit (2), wherein the object (7) moves along and in between the gripping arms (3);
    • activating the gripping unit (2) to release film (11) from the gripping arms (3) onto the object (7) while the object (7) moves towards the second conveyor (6);
    • activating the set of reciprocating elements (10) thereby forcing them together in order to press against the outer surface of the film (11), while the cutting device (12) and welding device (13), which is placed between the set of reciprocating elements (10), cuts and welds the film (11) thereby generating one or two closed ends; and • moving the object (7) with closed ends to the second conveyor (6) to transport the packaged object (7) away from the gripping unit (2).
    [10] 10. Method according to claim 9, wherein the gripping unit (2) is configured to accommodate a long object (7) by consecutively releasing two tubular film (11) segments along the object (7), said segments overlapping each other along the length of the object (7).
    [11] 11. Method of claim 10, wherein the overlapping segments are held in place by gluing or by a band, such as a strip.
    [12] 12. An apparatus for holding a tubular film (11) while said film is being welded an cut, said apparatus comprising elements (10) adapted for cooperating with each other for temporarily holding the film (11), said elements enclosing a cutting device (12) and a welding device (13).
    [13] 13. The apparatus according to claim 12, wherein the elements (10) adapted for cooperating with each other for holding the film comprise a set of reciprocating elements (10) that can be forced together in order to press against the outer surface of the film (11), while the cutting device (12) and welding device (13), which is placed between the set of reciprocating elements (10), cuts and welds the film (11) thereby generating two closed ends.
    DK 2017 70655 A1
    [14] 14. The apparatus according to claim 12 or 13, wherein the apparatus comprises an additional welding device (13’) placed between the elements (10) adapted for cooperating with each other for holding the film, said welding device (13) and said 5 additional welding device (13’) flanking the cutting device (12).
    类似技术:
    公开号 | 公开日 | 专利标题
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    GB2405133A|2005-02-23|Packaging delicate items in tubular wrapping
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    JP2002087410A|2002-03-27|Automatically filling and packaging machine
    同族专利:
    公开号 | 公开日
    DK179651B1|2019-03-12|
    WO2019042513A1|2019-03-07|
    EP3676182A1|2020-07-08|
    US20200189773A1|2020-06-18|
    EP3676182A4|2021-03-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US502402A|1893-08-01|Piston-rod protector |
    IT942984B|1971-11-27|1973-04-02|Cherio V|MACHINE FOR THE BAGGING OF PARTICULAR FOOD PRODUCTS AND FOR THE CONTINUOUS STORAGE OF TUBULAR NETWORK ON BAGGING PIPES|
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    DE102013007625A1|2013-05-02|2014-11-06|CUT Verwaltung UG |Slicer|
    EP2886268B1|2013-12-20|2017-02-15|Cryovac, Inc.|Device for sealing and cutting in a packaging apparatus, a packaging process and a packaging apparatus|
    DK178374B1|2014-11-04|2016-01-18|Frank Bruhn Aps|HORIZONTALLY ARRANGED WRAP PACKAGING SYSTEM|
    PL3115302T3|2015-07-07|2017-11-30|Ulma Packaging Technological Center, S. Coop|Method, machine and installation for vacuum packaging of products|CN111470100B|2020-03-14|2021-09-14|上海冀晟自动化成套设备有限公司|Steel drum film covering machine set and using method|
    法律状态:
    2019-03-11| PAT| Application published|Effective date: 20190301 |
    2019-03-12| PME| Patent granted|Effective date: 20190312 |
    优先权:
    申请号 | 申请日 | 专利标题
    DKPA201770655A|DK179651B1|2017-08-30|2017-08-30|Packaging system and method for packaging objects|DKPA201770655A| DK179651B1|2017-08-30|2017-08-30|Packaging system and method for packaging objects|
    US16/642,759| US20200189773A1|2017-08-30|2018-08-29|Packaging system and method for packaging objects|
    PCT/DK2018/050213| WO2019042513A1|2017-08-30|2018-08-29|Packaging system and method for packaging objects|
    EP18851406.1A| EP3676182A4|2017-08-30|2018-08-29|Packaging system and method for packaging objects|
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