EP1207109B1 - Method and device applying and heat-sealing a hood in thermoplastic retractable material in order to obtain a waterproof palletized package - Google Patents
Method and device applying and heat-sealing a hood in thermoplastic retractable material in order to obtain a waterproof palletized package Download PDFInfo
- Publication number
- EP1207109B1 EP1207109B1 EP01410152A EP01410152A EP1207109B1 EP 1207109 B1 EP1207109 B1 EP 1207109B1 EP 01410152 A EP01410152 A EP 01410152A EP 01410152 A EP01410152 A EP 01410152A EP 1207109 B1 EP1207109 B1 EP 1207109B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat
- cover
- sealing
- pallet
- cladding
- 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.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 title abstract 2
- 229920001169 thermoplastic Polymers 0.000 title 1
- 239000004416 thermosoftening plastic Substances 0.000 title 1
- 229920003023 plastic Polymers 0.000 claims abstract description 8
- 239000004033 plastic Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000002441 reversible effect Effects 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 238000005253 cladding Methods 0.000 claims 14
- 238000007599 discharging Methods 0.000 claims 1
- 239000010408 film Substances 0.000 description 21
- 238000004806 packaging method and process Methods 0.000 description 12
- 238000003825 pressing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 206010040954 Skin wrinkling Diseases 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920006300 shrink film Polymers 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 241001639412 Verres Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000013039 cover film Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 235000021183 entrée Nutrition 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
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
-
- 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
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/13—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state
- B65B9/135—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state for palletised loads
Definitions
- glass containers 10 are arranged in layers on shelves. dividers 12 made of cardboard or plastic to form a stack of bottles supported on a pallet 14.
- a floor mat 16 is placed on the pallet 14 and under the first layer of containers 10, and a film sheath 18 shrink plastic, for example polyethylene, is attached from above the stacking is then joined by heat sealing to the floor mat 16 for constitute a tight packaging free of folds.
- Hooding and shrinking machines have already been proposed to make a sealed packaging intended to withstand external storage conditions by all weather and with large temperature variations.
- the covering of the sheath 18 is carried out on a first station of work after transfer of the load, and a holding device 20 ensures the leaky nipping of the lower end of the sheath 18 against the studs 22 of the pallet 14 to prevent the vertical shrinkage of the film before the phase of heat-sealed with the floor mat 16.
- a reversible 24 suction fan and blower is placed under the pallet 14 to remove the folds of the sheath 18.
- the fan 24 is in blowing mode, the duct 18 inflates further at the air inlet between the floor mat 16 and the lower end of the sheath 18.
- the fan 24 is switched to mode suction to completely absorb the inflation so as to guarantee good load stability.
- FIG. 3 corresponds to document EP 0376028, which on the one hand uses grippers that grip the bottom edge of the cover to pull it down around the load during the hooding phase, and on the other hand the levers pressing cooperating by pivoting with stops which are spaced apart with respect to the pallet, and arranged at the level of the load laying plane, or below.
- the pressing levers are mounted on the handling table by fixed joints, and are not movable vertically. They only serve absolutely not for the cover. The cover is stretched around the load using grippers until its open bottom edge covers the stops fixed on the table. The pressing levers then take over, pressing the edge against the stops, so that the grippers can be released. The film is no longer stretched after removing the grippers.
- the lever race of pressing is limited by the stops, which are projecting from the edge of the floor mat.
- the retraction of the cover by the retraction frame is not achievable in the presence of grippers, which are integral with the frame of hood, since the retraction frame would abut against the frame hooding. This results in a risk of wrinkling during heat sealing, causing a leak and a poor mechanical strength at the area to be connected.
- the object of the invention is to provide a packaging method and device waterproof under retractable sheath of a stack of glass containers, allowing obtain regular heat sealing and reinforcement of the sheath in the area for attachment to the support pallet.
- the method according to the invention is characterized in that the film of the cover is stretched on the four sides by said gripping means during the stroke of the frame shrinkage and during heat sealing of the end of the sheath to the floor mat.
- the excess perimeter at the end of the sheath is transferred locally in its all against the four corners of the pallet before heat sealing. Air is drawn in so as to evacuate the trapped air and to fold up the area to be connected under the upper pallet floor. This process ensures the shrinkage of the film on the same position reserved for the cover, to keep the cover in engagement with the clamps having carried the hooding of the palletized load, and to avoid the folds along the sheath, and creating a guy line after heat sealing, so that reinforce the mechanical resistance at the base of the waterproof cover.
- the method of covering and heat sealing according to the invention is also applicable without inflation of the sheath during retraction (claim 13).
- the means for holding the end of the sheath during heat sealing are said movable gripping means for guarantee the heat sealing the area to be connected while keeping the film stretched over the four faces.
- a pleating mechanism having a pair of control levers arranged on each side of each clamp allows in addition to carry the excess perimeter at the end of the sheath against the four corners of the pallet before the heat sealing.
- each pair of control levers is pivotally mounted between an inactive position tilted at the rear of the clamp and away from the house film, and an active position requesting the end of the sheath against the floor mat on all four sides of the pallet while now a transverse tension on the film.
- a reversible fan is arranged under the pallet, and is switchable either in blowing mode during heating of the sheath during the downward movement of the retraction frame, either in suction to evacuate the air trapped in the cover before heat sealing. All the fingers, pliers and levers of the pleating mechanism are released of the cover film to optimize heat sealing and final shrinkage in four lower corners so as to create a guy line in each corner.
- the sheath of the cover is shaped on a motorized accumulator roller mounted on a movable transfer arm of a gripping robot.
- the retraction frame is movable between a raised position and a lowered position on a second post of the retraction device, which is mounted in opposition to the hood.
- the packaging machine designated by the general reference 30 uses the basic structure of the device described in the patent application French FR-A-2794720 of 10/6/1999 published on 15/12/2000, to which was adapted according to the invention a mechanism specific to the glass packaging process, with a particular cycle.
- the packaging machine 30 is composed of a covering device 32 and a retraction device 34 for ensuring the retraction phase on the post of cover.
- the two devices 32, 34 are mounted in opposition on two fixed uprights 36, 38 arranged on either side of the palletized CH load of containers 10.
- the retraction device 34 is provided with a retraction frame 39 for distribution hot air intended to heat the polyethylene film of the sheath 18.
- the frame of retraction 39 is mounted mobile on the upright 38 between a raised position (case of Figure 4) and a lowered position.
- the hood 32 comprises a motorized accumulator roller 40 on which is wound part of the sheath 18 constituting the cover for the load CH, and opening arms provided with retaining rollers 42.
- the roller accumulator 40 is secured to a transfer arm 44 mounted on a first slide 46 of the upright 36, and forming part of a gripping robot to be moved between a first position for winding and cutting the sheath 18, and a second position for depositing the cover on the palletized CH load. This device ensures the transfer and the opening of the sheath 18 adapted to the load CH in hooding lessons.
- a gripping assembly 48 is movably mounted on a second slide 50 upright 36, and has four fingers 52 and grippers 54 for gripping the cover open above the load CH placed on the conveyor 56.
- the loading of the cover on the fingers 52 is carried out after its transfer to the rollers 42 inside the retraction frame 39 being in the raised position.
- the four fingers 52 and grippers 54 of the gripping assembly 48 are arranged at the four corners of the sheath 18.
- the cover 18 is fully threaded on the load CH, and held in this position by the four fingers 52 and clamps 54 of the assembly of grip 48 which is at the bottom end of travel.
- the retraction frame 39 is turns on from top to bottom, and fan 24 is activated in mode blowing for the inflation of the cover 18 causing the removal of folds during the entire stroke of the frame 39.
- the air intake in the sheath of the cover 18 takes place through the orifice 58 formed between the open lower end of the sheath 18 and the floor mat 16.
- a pleating mechanism 60 comprises two control levers 62 arranged on either side of each clamp 54, and pivotally mounted between a inactive position ( Figures 7, 8 and 11) and an active position ( Figure 9). In the inactive position, the control levers 62 are tilted at the rear of the clamp 54 and the associated finger 52, being separated from the film of the cover 18.
- the fingers 52 are brought closer to the pallet 14, with simultaneously the passage of the four pairs of control levers 62 towards the active position on either side of the fingers 52.
- the cover 18 is urged against the floor mat 16 on all four sides of the pallet 14, while maintaining tension transverse on the film. This stage of the process occurs at the instant preceding the emission of hot air at the level of the floor mat 16.
- the excess perimeter of the film relative to the dimension of the pallet 14 at the level of the pads 22, is carried over in its entirety against the four corners of the pallet 14.
- the film of the cover 18 is stretched on all four sides to guarantee perfect heat sealing of the area to connected.
- the fan 24 is actuated simultaneously in suction mode to take the relay of mechanical action of fingers 52, pliers 54 and levers 62 of pleating, in order to avoid the vertical shrinkage of the film under the effect of its vertical shrinkage.
- the area to be connected between the lower end of the cover 18 and the floor mat 16, is positioned, for example by folding, under the upper floor of the pallet 14 under the combined effect of the suction of the fan 24, of the transverse withdrawal from of the retraction, and of the initial stress of the pleating levers 62.
- the aspiration is maintained as long as possible before the evacuation of the palletized load downstream of the packaging line. The risk of tearing the area to be connected is thus limited under the effect of the cold shrinkage of the film.
- the assembly of fingers 52, pliers 54, and levers 62 pleating is released from the cover 18, so as to optimize the heat sealing and the final retraction of the cover 18 in the four lower corners.
- the surplus of film transferred locally in the four angles created after heat sealing, a guy 63 which strengthens the mechanical resistance of the cover 18 at the level of the base, which is very stressed during subsequent handling of transport, loading, and storage of the palletized CH load.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
- Closing Of Containers (AREA)
- Vacuum Packaging (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Packages (AREA)
- Packaging Of Machine Parts And Wound Products (AREA)
Abstract
Description
L'invention est relative à un procédé de houssage et de thermoscellage d'une housse ou gaine souple en matière plastique thermorétractable pour constituer un emballage étanche sur une charge palettisée, en effectuant les opérations suivantes :
- enfiler la housse sur la charge en la tirant vers le bas et en la maintenant ouverte aux quatre angles de l'extrémité quadrangulaire par des moyens de préhension,
- chauffer la housse avec de l'air chaud, issu d'un cadre de rétraction déplaçable le long de la surface latérale de la housse,
- gonfler la housse avec de l'air de soufflage pour éviter les plis pendant la course de descente du cadre de rétraction,
- et thermosceller l'extrémité de la gaine à un tapis de sol en fin de course du cadre de rétraction après avoir aspiré l'air emprisonné dans la housse.
- put the cover on the load by pulling it down and keeping it open at the four corners of the quadrangular end by gripping means,
- heat the cover with hot air from a retractable frame that can be moved along the side surface of the cover,
- inflate the cover with blowing air to avoid creases during the downward movement of the retraction frame,
- and heat-seal the end of the sheath to a floor mat at the end of the retraction frame after having sucked the air trapped in the cover.
Sur la figure 1, des contenants 10 en verre sont rangés par couches sur des
intercalaires 12 en carton ou en matière plastique pour former un empilage de
bouteilles prenant appui sur une palette 14. Un tapis de sol 16 est placé sur la
palette 14 et sous la première couche de contenants 10, et une gaine 18 de film
plastique rétractable, par exemple de polyéthylène, est rapportée par dessus
l'empilage puis est solidarisée par thermoscellage au tapis de sol 16 pour
constituer un emballage étanche exempt de plis. In FIG. 1,
On a déjà proposé des machines de houssage et de rétraction pour réaliser un emballage étanche destiné à résister à des conditions de stockage extérieur par tous temps et avec de grandes variations de température.Hooding and shrinking machines have already been proposed to make a sealed packaging intended to withstand external storage conditions by all weather and with large temperature variations.
Sur la figure 2, le houssage de la gaine 18 est réalisé sur un premier poste de
travail après transfert de la charge, et un dispositif de maintien 20 assure le
pincement non étanche de l'extrémité inférieure de la gaine 18 contre les plots 22
de la palette 14 pour empêcher la rétraction verticale du film avant la phase de
thermoscellage avec le tapis de sol 16. Un ventilateur 24 réversible aspirant et
soufflant est disposé sous la palette 14 pour supprimer les plis de la gaine 18.
Lorsque le ventilateur 24 se trouve en mode soufflage, la gaine 18 se gonfle suite
à l'entrée d'air entre le tapis de sol 16 et l'extrémité inférieure de la gaine 18. Avant
la phase finale de thermoscellage, le ventilateur 24 est commuté en mode
aspiration pour résorber totalement le gonflage de manière à garantir une bonne
stabilité de la charge.In FIG. 2, the covering of the
Un tel dispositif connu présente deux inconvénients:
- lors du transfert de la charge houssée, et avant la phase de rétraction, la
gaine 18 frotte sur la table de manutention, et se décentre de la charge. Il en résulte une répartition périphérique irrégulière du surplus de périmètre de lagaine 18 par rapport à la charge, susceptible d'engendrer des défauts de thermoscellage; - le pincement de l'extrémité inférieure de la
gaine 18 contre lesplots 22 de lapalette 14 limite l'orifice d'entrée pour le passage de l'air de gonflage, et rend aléatoire la suppression des plis et la bonne aspiration de l'air emprisonné.
- during the transfer of the covered load, and before the retraction phase, the
sheath 18 rubs on the handling table, and offsets the load. This results in an irregular peripheral distribution of the excess perimeter of thesheath 18 relative to the load, capable of causing heat-sealing defects; - the pinching of the lower end of the
sheath 18 against thestuds 22 of thepallet 14 limits the inlet orifice for the passage of the inflation air, and makes random the removal of the folds and the good aspiration of the trapped air.
La figure 3 se rapporte à un dispositif d'emballage, dans lequel le dispositif de maintien comporte des éléments de pressage à pinces 25 coopérant avec des butées 26 écartées de la palette 14, et placées sur la table de manutention 28. Ce dispositif améliore le gonflage de la housse et l'aspiration lors du thermoscellage, mais présente d'autres inconvénients :
- le transfert de la
gaine 18 du mécanisme de houssage vers lespinces 25 et lesbutées 26 de la table demanutention 28 peut engendrer des risques de défaut de maintien de lagaine 18; - lors du thermoscellage de la
gaine 18 sur le tapis desol 16, lagaine 18 est relâchée despinces 25 de la table 28, et est plaquée contre le tapis desol 16 par effet d'aspiration duventilateur 24. La mise en oeuvre de cette opération est difficile, car les forces de rétraction verticales de lagaine 18 chauffée peuvent être à l'origine de défauts de thermoscellage.
- the transfer of the
sheath 18 from the covering mechanism to theclamps 25 and thestops 26 of the handling table 28 can generate risks of failure to maintain thesheath 18; - during the heat sealing of the
sheath 18 on thefloor mat 16, thesheath 18 is released from theclamps 25 of the table 28, and is pressed against thefloor mat 16 by the suction effect of thefan 24. The implementation of this operation is difficult, because the vertical retraction forces of the heatedsheath 18 can be the cause of heat-sealing defects.
La figure 3 correspond au document EP 0376028, lequel utilise d'une part des préhenseurs qui saisissent le bord inférieur de la housse pour la tirer vers le bas autour de la charge lors de la phase de houssage, et d'autre part des leviers de pressage coopérant par pivotement avec des butées, lesquelles sont écartées par rapport à la palette, et disposées au niveau du plan de pose de la charge, ou en-dessous. Les leviers de pressage sont montés sur la table de manutention par des articulations fixes, et ne sont pas mobiles verticalement. Ils ne servent absolument pas pour le houssage. La housse est étirée autour de la charge à l'aide des préhenseurs jusqu'à ce que son bord inférieur ouvert recouvre les butées fixées sur la table. Les leviers de pressage prennent ensuite le relais, en pressant le bord contre les butées, de sorte que les préhenseurs peuvent être dégagés. Le film n'est plus tendu après le retrait des préhenseurs. La course des leviers de pressage est limitée par les butées, lesquelles se trouvent en saillie par rapport au bord du tapis de sol. La rétraction de la housse par le cadre de rétraction n'est pas réalisable en présence des préhenseurs, lesquels sont solidaires du cadre de houssage, étant donné que le cadre de rétraction viendrait buter contre le cadre de houssage. Il en résulte un risque de formation de plis lors du thermoscellage, entraínant un défaut d'étanchéité et une mauvaise tenue mécanique au niveau de la zone à raccorder.FIG. 3 corresponds to document EP 0376028, which on the one hand uses grippers that grip the bottom edge of the cover to pull it down around the load during the hooding phase, and on the other hand the levers pressing cooperating by pivoting with stops which are spaced apart with respect to the pallet, and arranged at the level of the load laying plane, or below. The pressing levers are mounted on the handling table by fixed joints, and are not movable vertically. They only serve absolutely not for the cover. The cover is stretched around the load using grippers until its open bottom edge covers the stops fixed on the table. The pressing levers then take over, pressing the edge against the stops, so that the grippers can be released. The film is no longer stretched after removing the grippers. The lever race of pressing is limited by the stops, which are projecting from the edge of the floor mat. The retraction of the cover by the retraction frame is not achievable in the presence of grippers, which are integral with the frame of hood, since the retraction frame would abut against the frame hooding. This results in a risk of wrinkling during heat sealing, causing a leak and a poor mechanical strength at the area to be connected.
Les préambules des revendications 1, 6 et 13 sont basés sur cet état de la technique.The preambles of claims 1, 6 and 13 are based on this state of the art.
L'objet de l'invention consiste à réaliser un procédé et dispositif d'emballage étanche sous gaine rétractable d'un empilage de contenants en verre, permettant d'obtenir un thermoscellage régulier et un renforcement de la gaine dans la zone d'accrochage à la palette support.The object of the invention is to provide a packaging method and device waterproof under retractable sheath of a stack of glass containers, allowing obtain regular heat sealing and reinforcement of the sheath in the area for attachment to the support pallet.
Le procédé selon l'invention est caractérisé en ce que le film de la housse est tendu sur les quatre faces par lesdits moyens de préhension durant la course du cadre de rétraction et pendant le thermoscellage de l'extrémité de la gaine au tapis de sol.The method according to the invention is characterized in that the film of the cover is stretched on the four sides by said gripping means during the stroke of the frame shrinkage and during heat sealing of the end of the sheath to the floor mat.
Le surplus de périmètre à l'extrémité de la gaine est reporté localement dans sa totalité contre les quatre coins de la palette avant le thermoscellage. L'air est aspiré de manière à évacuer l'air emprisonné et à replier la zone à raccorder sous le plancher supérieur de la palette. Ce procédé permet d'assurer la rétraction du film sur le même poste réservé au houssage, pour maintenir la housse en prise avec les pinces ayant réalisé le houssage de la charge palettisée, et d'éviter les plis le long de la gaine, et en créant un haubanage après le thermoscellage, de manière à renforcer la résistance mécanique à la base de la housse étanche.The excess perimeter at the end of the sheath is transferred locally in its all against the four corners of the pallet before heat sealing. Air is drawn in so as to evacuate the trapped air and to fold up the area to be connected under the upper pallet floor. This process ensures the shrinkage of the film on the same position reserved for the cover, to keep the cover in engagement with the clamps having carried the hooding of the palletized load, and to avoid the folds along the sheath, and creating a guy line after heat sealing, so that reinforce the mechanical resistance at the base of the waterproof cover.
Le procédé de houssage et de thermoscellage selon l'invention est également applicable sans gonflage de la gaine lors de la rétraction (revendication 13).The method of covering and heat sealing according to the invention is also applicable without inflation of the sheath during retraction (claim 13).
Dans le dispositif pour la mise en oeuvre du procédé, les moyens de maintien de l'extrémité de la gaine lors du thermoscellage sont lesdits moyens de préhension mobile pour garantir le thermoscellage de la zone à raccorder en maintenant le film tendu sur les quatre faces.In the device for implementing the method, the means for holding the end of the sheath during heat sealing are said movable gripping means for guarantee the heat sealing the area to be connected while keeping the film stretched over the four faces.
Un mécanisme de plissage ayant une paire de leviers de commande disposés de part et d'autre de chaque pince permet en plus de reporter le surplus de périmètre à l'extrémité de la gaine contre les quatre coins de la palette avant le thermoscellage.A pleating mechanism having a pair of control levers arranged on each side of each clamp allows in addition to carry the excess perimeter at the end of the sheath against the four corners of the pallet before the heat sealing.
Selon une caractéristique de l'invention, chaque paire de leviers de commande est montée à pivotement entre une position inactive basculée à l'arrière de la pince et du doigt en étant écartée du film de la house, et une position active sollicitant l'extrémité de la gaine contre le tapis de sol sur les quatre faces de la palette tout en maintenant une tension transversale sur le film.According to a characteristic of the invention, each pair of control levers is pivotally mounted between an inactive position tilted at the rear of the clamp and away from the house film, and an active position requesting the end of the sheath against the floor mat on all four sides of the pallet while now a transverse tension on the film.
Selon une autre caractéristique de l'invention, un ventilateur réversible est disposé sous la palette, et est commutable soit en mode de soufflage pendant le chauffage de la gaine lors du mouvement de descente du cadre de rétraction, soit en mode aspiration pour évacuer l'air emprisonné dans la housse avant le thermoscellage. L'ensemble des doigts, pinces, et leviers du mécanisme de plissage est dégagé du film de la housse pour optimiser le thermoscellage et la rétraction finale dans les quatre angles inférieurs de manière à créer un haubanage dans chaque angle.According to another characteristic of the invention, a reversible fan is arranged under the pallet, and is switchable either in blowing mode during heating of the sheath during the downward movement of the retraction frame, either in suction to evacuate the air trapped in the cover before heat sealing. All the fingers, pliers and levers of the pleating mechanism are released of the cover film to optimize heat sealing and final shrinkage in four lower corners so as to create a guy line in each corner.
Selon un mode de réalisation préférentiel, la gaine de la housse est mise en forme sur un rouleau accumulateur motorisé monté sur un bras de transfert mobile d'un robot de préhension. Le cadre de rétraction est mobile entre une position relevée et une position abaissée sur un deuxième montant du dispositif de rétraction, lequel est monté en opposition par rapport au dispositif de houssage. According to a preferred embodiment, the sheath of the cover is shaped on a motorized accumulator roller mounted on a movable transfer arm of a gripping robot. The retraction frame is movable between a raised position and a lowered position on a second post of the retraction device, which is mounted in opposition to the hood.
D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de réalisation de l'invention donné à titre d'exemple non limitatif, et représenté aux dessins annexés, dans lesquels:
- la figure 1 est une vue schématique illustrant l'art antérieur d'une charge palettisée formée d'un empilage de contenants en verre sous film rétractable étanche;
- les figures 2 et 3 montrent des vues partielles de deux mécanismes d'emballage de charges palettisées de l'art antérieur, équipés de dispositifs de suppression des plis du film avant le thermoscellage au tapis de sol;
- la figure 4 représente une vue en coupe d'une machine d'emballage selon l'invention, le dispositif de houssage étant prêt à enfiler la gaine sur la charge, et le cadre de rétraction étant situé entre les galets de maintien de la gaine et le rouleau accumulateur,
- la figure 5 est une vue identique de la figure 4 lors du mouvement de descente de la gaine sur la charge, et du positionnement du cadre de rétraction au sommet de la charge;
- la figure 6 est une vue horizontale en coupe de la charge au cours du houssage, la housse étant maintenue aux quatre angles par un ensemble de préhension à doigts et pinces;
- les figures 7 à 9 illustrent différentes phases de fonctionnement de la machine d'emballage pour la résorption du surplus de périmètre de la housse;
- la figure 10 montre une vue en coupe horizontale du dispositif de la figure 9 au niveau de la palette, avec les leviers de plissage en position active;
- la figure 11 représente le dispositif d'emballage lors du thermoscellage et de la rétraction finale de la housse 18 dans les quatre angles inférieurs;
- la figure 12 est une vue partielle en perspective de la charge palettisée revêtue de la housse étanche après thermoscellage.
- Figure 1 is a schematic view illustrating the prior art of a palletized load formed of a stack of glass containers in waterproof shrink film;
- FIGS. 2 and 3 show partial views of two palletized load packaging mechanisms of the prior art, equipped with devices for removing folds from the film before heat sealing the floor carpet;
- FIG. 4 represents a sectional view of a packaging machine according to the invention, the covering device being ready to thread the sheath onto the load, and the retraction frame being located between the rollers holding the sheath and the accumulator roller,
- Figure 5 is an identical view to Figure 4 during the downward movement of the sheath on the load, and positioning of the retraction frame at the top of the load;
- Figure 6 is a horizontal sectional view of the load during the hooding, the cover being held at four angles by a gripping assembly with fingers and pliers;
- Figures 7 to 9 illustrate different phases of operation of the packaging machine for the absorption of the excess perimeter of the cover;
- Figure 10 shows a horizontal sectional view of the device of Figure 9 at the pallet, with the pleating levers in the active position;
- Figure 11 shows the packaging device during heat sealing and the final shrinkage of the
cover 18 in the four lower corners; - Figure 12 is a partial perspective view of the palletized load coated with the waterproof cover after heat sealing.
En référence à la figure 4, la machine d'emballage désignée par le repère général 30 reprend la structure de base du dispositif décrit dans la demande de brevet français FR-A-2794720 du 10/6/1999 publiée le 15/12/2000, à laquelle a été adapté selon l'invention un mécanisme spécifique au procédé d'emballage verrier, avec un cycle particulier.Referring to Figure 4, the packaging machine designated by the general reference 30 uses the basic structure of the device described in the patent application French FR-A-2794720 of 10/6/1999 published on 15/12/2000, to which was adapted according to the invention a mechanism specific to the glass packaging process, with a particular cycle.
La machine d'emballage 30 est composée d'un dispositif de houssage 32 et d'un
dispositif de rétraction 34 permettant d'assurer la phase de rétraction sur le poste
de houssage. Les deux dispositifs 32, 34 sont montés en opposition sur deux
montants 36, 38 fixes disposés de part et d'autre de la charge CH palettisée des
contenants 10.The packaging machine 30 is composed of a covering
Le dispositif de rétraction 34 est doté d'un cadre de rétraction 39 pour la répartition
d'air chaud destiné à chauffer le film de polyéthylène de la gaine 18. Le cadre de
rétraction 39 est monté mobile sur le montant 38 entre une position relevée (cas de
la figure 4) et une position abaissée.The
Le dispositif de houssage 32 comporte un rouleau accumulateur 40 motorisé sur
lequel est enroulée une partie de la gaine 18 constituant la housse pour la charge
CH, et des bras d'ouverture munis de galets de maintien 42. Le rouleau
accumulateur 40 est solidarisé à un bras de transfert 44 monté sur un premier
coulisseau 46 du montant 36, et faisant partie d'un robot de préhension pour être
déplacé entre une première position d'enroulement et de coupe de la gaine 18, et
une deuxième position de dépose de la housse sur la charge CH palettisée. Ce
dispositif assure le transfert et l'ouverture de la gaine 18 adaptée à la charge CH en
cours de houssage.The
Un ensemble de préhension 48 est monté mobile sur un deuxième coulisseau 50
du montant 36 vertical, et comporte quatre doigts 52 et des pinces 54 de saisie de
la housse ouverte au-dessus de la charge CH posée sur le transporteur 56. Le
chargement de la housse sur les doigts 52 s'effectue après son transfert sur les
galets 42 à l'intérieur du cadre de rétraction 39 se trouvant en position relevée. Les
quatre doigts 52 et des pinces 54 de l'ensemble de préhension 48 sont agencés
aux quatre coins de la gaine 18.A gripping
En référence aux figures 5 et 6 illustrant l'opération de houssage lors du
mouvement de descente du deuxième coulisseau 50, les doigts 52 et les pinces
54 maintiennent la housse ouverte aux quatre coins, tandis que l'écartement des
galets 42 évite le frottement de la housse sur la charge CH. Le cadre de rétraction
39 est déplacé jusqu'au niveau du sommet de la charge CH, et le bras de transfert
44 du robot est enlevé pour préparer la housse suivante.With reference to Figures 5 and 6 illustrating the hooding operation during
downward movement of the
Sur la figure 7, la housse 18 est totalement enfilée sur la charge CH, et maintenue
dans cette position par les quatre doigts 52 et pinces 54 de l'ensemble de
préhension 48 qui se trouve en fin de course inférieure. Le cadre de rétraction 39 se
met en marche du haut vers le bas, et le ventilateur 24 est actionné en mode
soufflage pour le gonflage de la housse 18 entraínant la suppression des plis
pendant toute la course du cadre 39. L'entrée d'air dans la gaine de la housse 18
s'effectue à travers l'orifice 58 ménagé entre l'extrémité inférieure ouverte de la
gaine 18 et le tapis de sol 16.In Figure 7, the
L'étape suivante est représentée sur la figure 8, dans laquelle le cadre de rétraction
39 continue à chauffer la zone à raccorder au voisinage de la palette 14, pendant
que le ventilateur 24 est commuté en mode aspiration pour évacuer l'air
emprisonné dans la housse 18 à travers l'orifice 58. La commutation du ventilateur
24 en mode aspiration doit être opérée juste avant le thermoscellage de la zone à
raccorder, de manière à éliminer un maximum de plis dans le film rétracté.The next step is shown in Figure 8, in which the
Un mécanisme de plissage 60 comprend deux leviers de commande 62
disposés de part et d'autre de chaque pince 54, et montés à pivotement entre une
position inactive (figures 7, 8 et 11) et une position active (figure 9). Dans la
position inactive, les leviers de commande 62 sont basculés à l'arrière de la pince
54 et du doigt 52 associé, en étant écartés du film de la housse 18. A
Sur les figures 9 et 10, on rapproche les doigts 52 de la palette 14, avec
simultanément le passage des quatre couples de leviers de commande 62 vers la
position active de part et d'autre des doigts 52. La housse 18 est sollicitée contre le
tapis de sol 16 sur les quatre faces de la palette 14, tout en maintenant la tension
transversale sur le film. Cette étape du procédé intervient à l'instant précédant
l'émission d'air chaud à hauteur du tapis de sol 16. Le surplus de périmètre du film
par rapport à la dimension de la palette 14 au niveau des plots 22, est reporté
dans sa totalité contre les quatre coins de la palette 14. Le film de la housse 18 est
tendu sur les quatre faces pour garantir un parfait thermoscellage de la zone à
raccorder.In FIGS. 9 and 10, the
Le ventilateur 24 est actionné simultanément en mode aspiration pour prendre le
relais de l'action mécanique des doigts 52, des pinces 54 et des leviers 62 de
plissage, afin d'éviter le retrait vertical du film sous l'effet de sa rétraction verticale. La
zone à raccorder entre l'extrémité inférieure de la housse 18 et le tapis de sol 16,
est positionnée, par exemple par repliage, sous le plancher supérieur de la palette
14 sous l'effet combiné de l'aspiration du ventilateur 24, du retrait transversal issu
de la rétraction, et de la contrainte initiale des leviers 62 de plissage. L'aspiration est
maintenue le plus longtemps possible avant l'évacuation de la charge palettisée
vers l'aval de la ligne d'emballage. Le risque de déchirure de la zone à raccorder est
ainsi limité sous l'effet du retrait à froid du film.The
En référence aux figures 11 et 12, l'ensemble doigts 52, pinces 54, et leviers 62
de plissage est dégagé de la housse 18, de manière à optimiser le thermoscellage
et la rétraction finale de la housse 18 dans les quatre angles inférieurs. Le surplus de
film reporté localement dans les quatre angles crée après thermoscellage, un
haubanage 63 qui renforce la résistance mécanique de la housse 18 au niveau de la
base, laquelle est très sollicitée lors des manipulations ultérieures de transport, de
chargement, et de stockage de la charge CH palettisée.With reference to FIGS. 11 and 12, the assembly of
Le concept d'emballage verrier étanche mis en oeuvre selon les étapes successives précitées, permet:
- d'assurer la rétraction du film sur le même poste réservé au houssage,
- de maintenir la housse 18 en prise avec les pinces 54 ayant réalisé le houssage de la charge CH palettisée,
- et d'éviter les plis en reportant le surplus de périmètre de la housse 18 dans les quatre angles, suite à l'intervention du mécanisme de plissage 60 juste avant le thermoscellage.
- to ensure the retraction of the film on the same station reserved for the cover,
- to keep the
cover 18 in engagement with theclamps 54 having carried out the lifting of the palletized load CH, - and to avoid wrinkles by transferring the excess perimeter of the
cover 18 into the four corners, following the intervention of thepleating mechanism 60 just before heat sealing.
Claims (13)
- A method for pallet covering and heat-sealing a flexible heat-shrinkable plastic pallet cover (18) or cladding in order to form a leakproof package over a load (CH) by performing the following operations:slipping the cover (18) over the load (CH) by pulling it downwards and keeping it open at the four angles of the quadrangular end by gripping means (48),heating the cover (18) with hot air, from a shrinkage frame (39) displaceable along the side surface of the cover (18),inflating the cover (18) with blown air in order to avoid folds during the downward travel of the shrinkable frame (39),and heat-sealing the end of the cladding to a floor mat (16) at the end of travel of the shrinkable frame (39) after having sucked up the trapped air in the cover (18),
- The method for pallet covering and heat-sealing according to claim 1, characterized in that the excess perimeter at the end of the cladding (18) is locally put back against the four corners of the pallet (14) before heat-sealing.
- The method for pallet covering and heat-sealing according to claim 1 or 2, characterized in that the air is sucked up so as to discharge the trapped air and position the area to be joined under the upper platform of the pallet (14).
- The method for pallet covering and heat-sealing according to claim 3, characterized in that the positioning of the area to be joined is carried out by folding.
- The method for pallet covering and heat-sealing according to any of claims 1 to 4, characterized in that the excess film locally put back in the four lower angles, creates guying after heat-sealing, in order to reinforce mechanical strength at the base of the leakproof cover.
- A device for pallet covering and heat-sealing a heat-shrinkable plastic cover on a pallet load (CH) notably containing glass containers (10), and including:means for slipping the cover (18) over the load (CH) by pulling it downwards and keeping it open at the four angles of the quadrangular end by gripping means (48),means for heating the cover (18) with hot air, from a shrinkage frame (39) along the external surface of the cover (18),means for inflating the cover (18) with blown air in order to avoid folds during the downward travel of the shrinkage frame (39),means for heat-sealing the end of the cladding to a floor mat (16) at the end of the travel of the shrinkage frame (39) after having sucked up the trapped air in the cover (18), the gripping means (48) being movably mounted on a first upright (36) of the pallet covering device (32), and including a plurality of fingers (52) and grips (54) for providing grip at the four corners of the open cover during the travel of the shrinkage frame (39),and means for holding the end of the cladding during the heat-sealing,
- The device for pallet covering and heat-sealing according to claim 6, characterized in that the gripping means (48) include a folding mechanism (60) with a pair of control levers (62) positioned on either side of each grip (54) in order to put back the excess perimeter at the end of the cladding (18) against the four corners of the pallet (14) before heat-sealing.
- The device for pallet covering and heat-sealing according to claim 7, characterized in that each pair of control levers (62) is pivotably mounted between a tilted inactive position at the rear of the grip (54) and the associated finger (52), moved away from the film of the cover (18), and an active position urging the end of the cladding against the floor mat (16) on the four faces of the pallet (14) while maintaining transverse tension on the film.
- The device for pallet covering and heat-sealing according to any of claims 6 to 8, characterized in that a reversible fan (24) is positioned under the pallet (14) and may be switched either to a blowing mode during the heating of the cladding (18) upon the downward motion of the shrinkage frame (39), or to the sucking mode for discharging the trapped air in the cover before heat-sealing.
- The device for pallet covering and heat-sealing according to any of claims 8 or 9, characterized in that the whole of the fingers (52), grips (54) and levers (62) of the folding mechanism (60) is freed from the film of the cover (18) in order to optimize heat-sealing and final shrinkage in the four lower angles in order to create guying (63) in each angle.
- The device for pallet covering and heat-sealing according to claim 6, characterized in that the cladding of the cover (18) is formed on a motorized accumulating roll (40) mounted on a mobile transfer arm (44) of a robot gripper.
- The device for pallet covering and heat-sealing according to claim 11, characterized in that the shrinkage frame (39) is movable between a raised position and a lowered position on a second upright (38) of the shrinkage device (34), which is mounted in opposition with respect to the pallet covering device (32).
- A method for pallet covering and heat-sealing a flexible heat-shrinkable plastic pallet cover (18) or cladding in order to form a leakproof package on a load (CH) by carrying out the following operations:slipping the cover (18) over the load (CH) by pulling it downwards and keeping it open at the four angles of the quadrangular end by gripping means,heating the cover (18) with hot air, from a shrinkage frame (39) movable along the side surface of the cover (18),and heat-sealing the end of the cladding to a floor mat (16) at the end of the travel of the shrinkage frame (39),
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0014806A FR2816587B1 (en) | 2000-11-16 | 2000-11-16 | METHOD AND DEVICE FOR COVERING AND HEAT-SEALING A COVER MADE OF HEAT-SHRINKABLE PLASTIC MATERIAL TO CONSTITUTE A WATERPROOF PACKAGING ON A PALLETIZED LOAD |
FR0014806 | 2000-11-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1207109A1 EP1207109A1 (en) | 2002-05-22 |
EP1207109B1 true EP1207109B1 (en) | 2004-11-03 |
Family
ID=8856553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01410152A Expired - Lifetime EP1207109B1 (en) | 2000-11-16 | 2001-11-15 | Method and device applying and heat-sealing a hood in thermoplastic retractable material in order to obtain a waterproof palletized package |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1207109B1 (en) |
AT (1) | ATE281358T1 (en) |
DE (1) | DE60106845T2 (en) |
ES (1) | ES2232579T3 (en) |
FR (1) | FR2816587B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2850949B1 (en) | 2003-02-10 | 2005-10-21 | Thimon | DEVICE AND METHOD FOR PACKAGING A PALLETIZED LOAD USING A THERMORETRACTABLE PLASTIC FILM COVER |
ITBO20040174A1 (en) * | 2004-03-26 | 2004-06-26 | Aetna Group Spa | EQUIPMENT FOR COVERING GROUPS OF PRODUCTS WITH EXTENSIBLE TUBULAR FILM |
FR2869876B1 (en) * | 2004-05-07 | 2006-07-21 | Thimon Sa | DEVICE AND METHOD FOR OPENING A BLOW PLASTIC SHEATH FOR SHAPING A SOFT PACKAGING COVER OF A LOAD |
FR3069232B1 (en) * | 2017-07-24 | 2021-10-29 | Thimon | COVERING AND HEAT-SEALING PROCESS AND COVERING AND THERMOS-SEALING DEVICE |
KR102140430B1 (en) * | 2018-08-08 | 2020-08-03 | (주)범영인터팩 | Stretch hood film packing system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2417434A1 (en) * | 1978-02-18 | 1979-09-14 | Moellers Maschf | DEVICE FOR INTRODUCING PARTS OF A CONTRACTABLE PACKAGING SHEET INTO RECESSED ZONES PROVIDED ON THE SIDES OF A STACK OF OBJECTS |
DE8816085U1 (en) * | 1988-12-24 | 1989-03-09 | MSK-Verpackungs-Systeme GmbH, 4190 Kleve | Device for packing a stack of goods arranged on a pallet |
IT1229317B (en) * | 1989-05-02 | 1991-08-08 | Sestese Off Mec | AUTOMATIC WRAPPING MACHINE FOR THE PACKAGING OF PRODUCTS, IN PARTICULAR OF PALLETIZED UNITS, WITH HEAT-SHRINKABLE TUBULAR FILM. |
ATE153940T1 (en) * | 1992-07-24 | 1997-06-15 | Erapa Ceka Maschbau | METHOD AND DEVICE FOR PACKAGING STACKED GOODS |
DE4342490C2 (en) * | 1993-12-13 | 1996-09-26 | Lachenmeier Kurt Aps | Method and device for shrinking a film hood made of heat-shrinkable material, which is pulled over a load on a pallet |
-
2000
- 2000-11-16 FR FR0014806A patent/FR2816587B1/en not_active Expired - Fee Related
-
2001
- 2001-11-15 DE DE60106845T patent/DE60106845T2/en not_active Expired - Lifetime
- 2001-11-15 ES ES01410152T patent/ES2232579T3/en not_active Expired - Lifetime
- 2001-11-15 EP EP01410152A patent/EP1207109B1/en not_active Expired - Lifetime
- 2001-11-15 AT AT01410152T patent/ATE281358T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ES2232579T3 (en) | 2005-06-01 |
DE60106845D1 (en) | 2004-12-09 |
ATE281358T1 (en) | 2004-11-15 |
DE60106845T2 (en) | 2005-11-10 |
EP1207109A1 (en) | 2002-05-22 |
FR2816587B1 (en) | 2003-03-07 |
FR2816587A1 (en) | 2002-05-17 |
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