EP0657356A1 - Procédé et dispositif pour rétracter und housse en matériau thermorétractable sur une charge palletisée - Google Patents

Procédé et dispositif pour rétracter und housse en matériau thermorétractable sur une charge palletisée Download PDF

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Publication number
EP0657356A1
EP0657356A1 EP94119680A EP94119680A EP0657356A1 EP 0657356 A1 EP0657356 A1 EP 0657356A1 EP 94119680 A EP94119680 A EP 94119680A EP 94119680 A EP94119680 A EP 94119680A EP 0657356 A1 EP0657356 A1 EP 0657356A1
Authority
EP
European Patent Office
Prior art keywords
shrinking
hood
load
film
pallet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94119680A
Other languages
German (de)
English (en)
Other versions
EP0657356B1 (fr
Inventor
Kurt C/O Kurt Lachenmeier A/S Lachenmeier
Fleming C/O Kurt Lachenmeier A/S Thomsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Signode Denmark ApS
Original Assignee
Kurt Lachenmeier AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Application filed by Kurt Lachenmeier AS filed Critical Kurt Lachenmeier AS
Publication of EP0657356A1 publication Critical patent/EP0657356A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
    • B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
    • B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
    • B65B53/066—Mobile frames, hoods, posts or the like

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • a film hood which consists of a shrinkable film material and is shrunk by the action of heat. In this way, the load on the pallet is fixed at the same time and protected against damage in transit. Pulling the film hood over, folding and fixing the hood edge under the load or the pallet, and shrinking, e.g. by radiation burners or hot air blowers, can be done fully automatically or semi-automatically in suitable devices.
  • the load on the pallet can consist of smaller, stacked units, which in turn are surrounded by shrink films or other plastic films.
  • the film hood will melt or stick together with the wrapping material of the smaller units if it is heated in the system and pressed against it under the shrinking effect. The film hood can then no longer be properly separated from the load and the individual packaging can be damaged, which can lead to considerable transport losses.
  • the known method and the device intended for it work on the one hand with a constant air pressure of the blower, on the other hand with a so-called hot blow mast, which is guided in a circle around the stack of goods and shrinks the shrink film over the entire height of the stack, progressively in the circumferential direction .
  • a so-called hot blow mast which is guided in a circle around the stack of goods and shrinks the shrink film over the entire height of the stack, progressively in the circumferential direction .
  • the air trapped in the film hood rises and has a higher temperature in the upper area than below, it is not possible to achieve a uniform, reproducible contact relationship between the inner and outer films over the amount of the charge.
  • the invention has for its object to provide a method of the type mentioned in such a way that the shrunk film hood lies evenly against the load can be without gluing or fusing with foils that surround the cargo units.
  • the use of a pressure blower should be unnecessary.
  • the object is achieved with the features of claim 1 and claim 13.
  • the invention is based on the fact that the expansion of the enclosed air is sufficient for the inflation of the film hood due to the heat supplied for shrinking, and that to achieve the desired effect, the pressure not increased as in the prior art, but must be reduced to a certain level.
  • the level of the internal pressure to be maintained is determined by the shrink force generated by the film hood, which causes the film hood to be placed against the load. Since the shrinking takes place with the help of a vertically moving shrink frame, the pressure conditions that change over the stack height can be compensated.
  • the regulation of the air pressure within the film hood can start from different output variables.
  • a suction blower can be provided which extracts excess air from the interior of the film hood, or the heat supply to the film hood can be controlled by changing the vertical speed of the shrink frame and / or its heat emission. It is also possible to combine different control parameters.
  • a shrinking system for carrying out the method which, in a manner known per se, has a shrinking frame which can be moved vertically along the pallet load and which, according to the invention, has a holding device which fixes the film to the lower edge of the pallet during the shrinking process, and more adjustable devices for lowering the initial air pressure inside the film hood during shrinking.
  • the holding device can advantageously be formed, for example, by grippers on the shrink frame are attached themselves and serve to pull off and open the film but also to hold the film in the area of the lower edge of the pallet so that the film can be fixed to the edge of the pallet by heat.
  • the holding device is attached to a conveyor belt which is used to transport the pallets to the individual processing stations and holds the film on the lower edge of the pallet during the entire shrinking process. If a lifting platform is provided, the holding device can also be provided on the lifting platform in order to ensure that the film of the pallet is fixed during the entire shrinking process.
  • the holding device is advantageously formed by mechanical grippers that press the film against the pallet.
  • the devices used to regulate the air pressure within the film hood can be formed by a suction fan, the output of which is controlled as a function of the desired air pressure within the film hood.
  • devices are also provided in an advantageous manner which detect the shrinking temperature during the shrinking process and keep it at a uniform level while the shrinking frame moves from the lower part of the film hood to the upper part.
  • the shrinking temperature that is to say the temperature which the film has during the shrinking process, is different at different heights of the films. Controlling the shrink temperature to achieve a uniformly shrunk film hood is therefore advisable.
  • a device for regulating the upward movement of the shrink frame can advantageously be provided, the shrink frame remaining at the lower shrink temperature for a longer period of time at the lower edge of the film hood while moving upwards with increasing speed. It must be assumed that the hot air rising during the shrinking process has already preheated the upper part of the film before the shrinking frame reaches this area.
  • the device according to the invention can advantageously have at least two vertical pressure strips, which are arranged at a distance from the two narrow sides of the pallet load in the middle thereof and can be moved toward the load.
  • the air in particular in the corner areas, causes the film hood to swell, so that these particularly vulnerable areas are less exposed to the risk of entering into an adhesive connection with the lower films.
  • 1 denotes a load arranged on a pallet, which can consist of individual pieces stacked one on top of the other, each covered by a film, which must be protected against contact with a heated and / or softened other film.
  • a film hood 2 made of a heat-shrinkable material has already been pulled over.
  • a suction fan can be provided under the pallet at 3.
  • the downward-facing hood edge 4 of the film hood 2 is folded over and fixed inward around the lower edge of the load 1, so that the film does not lift off as a result of the vertical shrinkage forces and the warm air rising upwards.
  • the film on the pallet is shrunk tightly with the aid of hot gas jets directed inwards and downwards, which emanate from a shrinking frame 5.
  • the shrink frame is in its lowest position. It surrounds the load 1 from all sides and can also be equipped in a known manner with gripping devices in order to pull the film hood from a supply, open it and pull it over the load.
  • the hood edge 4 can also be folded over and held under the load with the aid of the gripping devices mentioned.
  • the shrinking frame 5 briefly, e.g. depending on the film thickness for 3 to 5 seconds, remains in its lowest position and releases heat into the space enclosed by it, but to a lesser extent, the film edge shrinks to the edge of the pallet.
  • the heated air is blown against the film and rises, releasing its heat to the film.
  • the air enclosed within the film hood 2 consequently expands, so that an air gap forms between the film hood and the charge enclosed by it, as can be seen from FIG. 3.
  • the film hood 2 shrinks.
  • the heat is released of the shrinking frame 5 increases, and this is simultaneously moved upwards at a predetermined speed.
  • the material of the film hood becomes soft on the one hand, and on the other hand, the trapped air expands further and causes the film hood to expand.
  • the air pressure within the film hood 2 were maintained in the state indicated in FIG. 3, a sufficient shrinkage of the film material would be prevented, so that the film hood 2 could not contact the outer surfaces of the load in the desired manner. According to the invention, the air pressure is therefore reduced to such an extent that it can be overcome by the shrinking force of the film, but this does not come into premature contact with the load, as is shown in FIG. 4.
  • the lowering of the air pressure within the film hood 2 takes place in this case by controlled operation of the suction blower 3, which draws just enough air to maintain the state shown in FIG. that the film is kept at a distance from the load as long as it has not shrunk. Simultaneously with the shrinking, it then attaches itself to the outer surface of the load 1, but there is no more sticking, since cooling also begins at the same time.
  • the enclosed air is heated, but significantly lower than the shrinking or softening temperature of the films, so that this air acts as an insulating layer against the transfer of the shrinking heat to the load.
  • the removal of air is maintained until the finished pallet has been completed as shown in FIG. 5.
  • the shrink frame 5 has then reached its uppermost position, in which it is switched off after completion of the upper shrink, and the film hood 2 lies tightly against the load on all sides, without sticking to further films which possibly surround the load units.
  • the method according to the invention makes it possible to regulate the air pressure prevailing within the film hood 2 in such a way that it can be adapted to the conditions prevailing at any time during the shrinking process. It is therefore advisable in the example described to control the power of the suction fan 3 as a function of the speed of the shrink frame 5 and / or its heat output. The best results are generally obtained if the suction power of the blower is gradually increased during the upward movement of the shrink frame.
  • a suitable procedure can also be achieved in another way that the air pressure within the film hood is kept at the correct value.
  • the speed at which the shrink frame moves up or down can be varied. Simultaneously or alternatively, it is possible to control the heat output emitted by the shrink frame.
  • the shrink temperature which can be measured in a suitable manner, comes into consideration as a further control variable.
  • FIGS. 6 and 7 advantageously prevents the foils from sticking to the vertical edges 6 of the charge stack at which the highest stresses occur in the foil hood.
  • 6 shows a view of the narrow side of the pallet
  • FIG. 7 shows a plan view.
  • the inflated film hood 2 is compressed on the narrow sides of the pallet stack over its entire height along a vertical center line, so that the hood comes close to the load or comes into slight contact with it without but to glue with it.
  • This lateral compression causes an increased inflation of the film hood in the other areas, as is particularly the case is shown in Fig. 7, wherein the film hood is no longer on the side edges 6 of the load. Rather, the system only comes into being when the film hood shrinks, ie when it cools down, so that no gluing takes place at the edges either.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
EP94119680A 1993-12-13 1994-12-13 Procédé et dispositif pour rétracter und housse en matériau thermorétractable sur une charge palletisée Expired - Lifetime EP0657356B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4342490 1993-12-13
DE4342490A DE4342490C2 (de) 1993-12-13 1993-12-13 Verfahren und Vorrichtung zum Schrumpfen einer aus heißschrumpffähigem Material bestehenden Folienhaube, die über eine auf einer Palette befindliche Ladung gezogen ist

Publications (2)

Publication Number Publication Date
EP0657356A1 true EP0657356A1 (fr) 1995-06-14
EP0657356B1 EP0657356B1 (fr) 1997-07-30

Family

ID=6504894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94119680A Expired - Lifetime EP0657356B1 (fr) 1993-12-13 1994-12-13 Procédé et dispositif pour rétracter und housse en matériau thermorétractable sur une charge palletisée

Country Status (2)

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EP (1) EP0657356B1 (fr)
DE (2) DE4342490C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2816587A1 (fr) * 2000-11-16 2002-05-17 Thimon Procede et dispositif de houssage et de thermoscellage d'une housse en matiere plastique thermoretractable pour constituer un emballage etanche sur une charge palettisee

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114701707B (zh) * 2022-04-19 2022-11-04 徐州力能电子科技有限公司 一种新能源汽车用电池组包装机械及包装方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7207219A (fr) * 1972-05-27 1973-11-29
EP0283541A1 (fr) * 1987-03-26 1988-09-28 VFI Gesellschaft für Verpackungstechnik mbH Procédé et appareil pour rétrécir une housse en plastique autour d'une charge palettisée
EP0376028A1 (fr) * 1988-12-24 1990-07-04 MSK-Verpackungs-Systeme Gesellschaft mit beschränkter Haftung Dispositif d'emballage pour une pile d'articles posée sur une palette
FR2644136A1 (fr) * 1989-03-08 1990-09-14 Balgros Jacques Dispositif de retraction a air chaud
DE4311495C1 (de) * 1993-04-07 1994-07-21 Moellers Maschf Gmbh Verfahren zum Umhüllen eines Gutstapels

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3141100A1 (de) * 1981-10-16 1983-04-28 Msk - Verpackungs-Systeme Gmbh, 4192 Kalkar Verfahren und vorrichtung zum verpacken von plaettierten gutstapeln
EP0116124B2 (fr) * 1982-12-30 1992-11-04 MSK-Verpackungs-Systeme Gesellschaft mit beschränkter Haftung Procédé et dispositif pour la rétraction d'une housse rétractable qui est tirée au dessus d'une pile d'articles
DE3327996A1 (de) * 1983-08-03 1985-02-14 MSK - Verpackungs-Systeme GmbH, 4190 Kleve Verfahren zum verpacken von palettierten gutstapeln und vorrichtung zur durchfuehrung dieses verfahrens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7207219A (fr) * 1972-05-27 1973-11-29
EP0283541A1 (fr) * 1987-03-26 1988-09-28 VFI Gesellschaft für Verpackungstechnik mbH Procédé et appareil pour rétrécir une housse en plastique autour d'une charge palettisée
EP0376028A1 (fr) * 1988-12-24 1990-07-04 MSK-Verpackungs-Systeme Gesellschaft mit beschränkter Haftung Dispositif d'emballage pour une pile d'articles posée sur une palette
FR2644136A1 (fr) * 1989-03-08 1990-09-14 Balgros Jacques Dispositif de retraction a air chaud
DE4311495C1 (de) * 1993-04-07 1994-07-21 Moellers Maschf Gmbh Verfahren zum Umhüllen eines Gutstapels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2816587A1 (fr) * 2000-11-16 2002-05-17 Thimon Procede et dispositif de houssage et de thermoscellage d'une housse en matiere plastique thermoretractable pour constituer un emballage etanche sur une charge palettisee
EP1207109A1 (fr) * 2000-11-16 2002-05-22 Société Thimon Procédé et dispositif de houssage et de thermoscellage d'une housse en matière plastique thermorétractable pour constituer un emballage étanche palettisé

Also Published As

Publication number Publication date
EP0657356B1 (fr) 1997-07-30
DE59403554D1 (de) 1997-09-04
DE4342490C2 (de) 1996-09-26
DE4342490A1 (de) 1995-06-14

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