EP1207109A1 - 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 PDF

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Publication number
EP1207109A1
EP1207109A1 EP01410152A EP01410152A EP1207109A1 EP 1207109 A1 EP1207109 A1 EP 1207109A1 EP 01410152 A EP01410152 A EP 01410152A EP 01410152 A EP01410152 A EP 01410152A EP 1207109 A1 EP1207109 A1 EP 1207109A1
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EP
European Patent Office
Prior art keywords
cover
heat
sheath
covering
heat sealing
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Granted
Application number
EP01410152A
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German (de)
French (fr)
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EP1207109B1 (en
Inventor
Jean-Paul Charles Martin Cocher
Georges Jaconelli
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THIMON
Original Assignee
THIMON Ste
THIMON SOC
Thimon Ste
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    • 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 resting 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.
  • a film sheath 18 shrink plastic for example polyethylene
  • 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 from 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.
  • the object of the invention is to provide a packaging method and device waterproof under retractable sheath of a stack of glass containers, allowing to obtain a regular heat-sealing and a reinforcement of the sheath in the area for attachment to the support pallet.
  • the method according to the invention is characterized in that the excess perimeter to the end of the sheath is locally transferred in its entirety against the four corners of the pallet before heat sealing.
  • the cover film is stretched over the four sides by the gripping means to guarantee heat sealing of the area to be connected.
  • the air is sucked 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 retraction of the film on the same post reserved for cover, to keep the cover in engagement with the pliers having carried out the covering the palletized load, and avoiding creases along the sheath, and creating a guy line after heat sealing, so as to reinforce the resistance mechanical 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.
  • 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 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 N ° 9907597 of 10/6/1999, 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 movably on the upright 38 between a raised position (in the case of Figure 4) and a lowered position.
  • the hood 32 includes 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 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 the stroke.
  • 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 creases throughout the 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 height 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 the mechanical action of the fingers 52, the pliers 54 and the 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 guying 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.

Abstract

The procedure, using a bag or sleeve (18) of a thermo-shrink plastic, consists of drawing the sleeve down over the palleted load (CH) with clamps (54) holding its end open, heating the sleeve with hot air from a shrinking frame (39) which descends over its sides while inflating it with a blower (24) to prevent creasing. The procedure, using a bag or sleeve (18) of a thermo-shrink plastic, consists of drawing the sleeve down over the palleted load (CH) with clamps (54) holding its end open, heating the sleeve with hot air from a shrinking frame (39) which descends over its sides while inflating it with a blower (24) to prevent creasing. The lower edge of the sleeve is then sealed to a mat (16) between the load and pallet (14) as the shrinking frame reaches the end of its travel once air trapped inside the sleeve has been sucked out, using the blower (24) in a reverse mode. Any surplus material from the lower edge of the sleeve is held against the four corners of the pallet prior to sealing and fastened to the pallet to give extra mechanical strength. Frames or arms carrying the sleeve clamps, heaters and sleeve, forming rollers slide on uprights.

Description

Domaine technique de l'inventionTechnical field of the invention

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 au tapis de sol en fin de course du cadre de rétraction après avoir aspiré l'air emprisonné dans la housse.
The invention relates to a method of covering and heat-sealing a flexible cover or sheath of heat-shrinkable plastic to form a sealed package on a palletized load, by performing the following operations:
  • 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 the floor mat at the end of the retraction frame after having sucked the air trapped in the cover.

Etat de la techniqueState of the art

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, glass containers 10 are arranged in layers on shelves. dividers 12 made of cardboard or plastic to form a stack of bottles resting 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.

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 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 from the sheath 18. When 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. Before the final heat sealing phase, the fan 24 is switched to mode suction to completely absorb the inflation so as to guarantee good load stability.

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 la gaine 18 par rapport à la charge, susceptible d'engendrer des défauts de thermoscellage;
  • le pincement de l'extrémité inférieure de la gaine 18 contre les plots 22 de la palette 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.
Such a known device has two drawbacks:
  • 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 surplus perimeter of the sheath 18 relative to the load, capable of causing heat-sealing defects;
  • the pinching of the lower end of the sheath 18 against the studs 22 of the pallet 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 correspond au document EP 0376028 se rapportant 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 les pinces 25 et les butées 26 de la table de manutention 28 peut engendrer des risques de défaut de maintien de la gaine 18;
  • lors du thermoscellage de la gaine 18 sur le tapis de sol 16, la gaine 18 est relâchée des pinces 25 de la table 28, et est plaquée contre le tapis de sol 16 par effet d'aspiration du ventilateur 24. La mise en oeuvre de cette opération est difficile, car les forces de rétraction verticales de la gaine 18 chauffée peuvent être à l'origine de défauts de thermoscellage.
FIG. 3 corresponds to document EP 0376028 relating to a packaging device, in which the holding device comprises clamping pressing elements 25 cooperating with stops 26 spaced from the pallet 14, and placed on the handling table 28 This device improves the inflation of the cover and the suction during heat sealing, but has other disadvantages:
  • the transfer of the sheath 18 from the hood mechanism to the clamps 25 and the stops 26 of the handling table 28 can generate risks of failure to maintain the sheath 18;
  • during the heat sealing of the sheath 18 on the floor mat 16, the sheath 18 is released from the clamps 25 of the table 28, and is pressed against the floor mat 16 by the suction effect of the fan 24. The implementation of this operation is difficult, because the vertical retraction forces of the heated sheath 18 can be the cause of heat-sealing defects.

Objet de l'inventionSubject of the invention

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 to obtain a regular heat-sealing and a reinforcement of the sheath in the area for attachment to the support pallet.

Le procédé selon l'invention est caractérisé en ce que 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. Le film de la housse est tendu sur les quatre faces par les moyens de préhension pour garantir le thermoscellage de la zone à raccorder. 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.The method according to the invention is characterized in that the excess perimeter to the end of the sheath is locally transferred in its entirety against the four corners of the pallet before heat sealing. The cover film is stretched over the four sides by the gripping means to guarantee heat sealing of the area to be connected. The air is sucked so as to evacuate the trapped air and to fold up the area to be connected under the upper pallet floor.

Ce procédé permet d'assurer la rétraction du film sur le même poste réservé au houssage, de 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. This process ensures the retraction of the film on the same post reserved for cover, to keep the cover in engagement with the pliers having carried out the covering the palletized load, and avoiding creases along the sheath, and creating a guy line after heat sealing, so as to reinforce the resistance mechanical 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.The method of covering and heat sealing according to the invention is also applicable without inflation of the sheath during retraction.

Dans le dispositif pour la mise en oeuvre du procédé, les moyens de préhension sont montés mobiles sur un premier montant du dispositif de houssage, et comportent :

  • une pluralité de doigt et pinces pour la saisie aux quatre coins de la housse ouverte,
  • et un mécanisme de plissage ayant une paire de leviers de commande disposés de part et d'autre de chaque pince pour reporter le surplus de périmètre à l'extrémité de la gaine contre les quatre coins de la palette avant le thermoscellage.
In the device for implementing the method, the gripping means are mounted mobile on a first upright of the covering device, and comprise:
  • a plurality of fingers and grippers for gripping at the four corners of the open cover,
  • and a pleating mechanism having a pair of control levers arranged on either side of each clamp to transfer the excess perimeter at the end of the sheath against the four corners of the pallet before 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 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.

Description sommaire des dessinsBrief description of the drawings

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.
Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention given by way of nonlimiting example, and represented in the appended drawings, in which:
  • Figure 1 is a schematic view illustrating the prior art of a palletized load formed of a stack of glass containers in sealed shrink film;
  • Figures 2 and 3 show partial views of two palletized load packaging mechanisms of the prior art, equipped with devices for removing folds of the film before heat sealing the floor mat;
  • 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 the four corners 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.

Description d'un mode de réalisation préférentielDescription of a preferred embodiment

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 N° 9907597 du 10/6/1999, 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 N ° 9907597 of 10/6/1999, 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 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.

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 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 movably on the upright 38 between a raised position (in the case of Figure 4) and a lowered position.

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 hood 32 includes 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 opening of the sheath 18 adapted to the load CH in hooding lessons.

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 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.

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 second slide 50, the fingers 52 and the clamps 54 keep the cover open at all four corners, while the spacing of the rollers 42 prevents friction of the cover on the load CH. The retraction frame 39 is moved to the level of the top of the load CH, and the transfer arm 44 of the robot is removed to prepare the next cover.

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 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 the stroke. 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 creases throughout the 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.

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 retraction frame 39 continues to heat the area to be connected in the vicinity of the pallet 14, for the fan 24 is switched to suction mode to exhaust the air trapped in the cover 18 through the orifice 58. The switching of the fan 24 in suction mode must be operated just before heat sealing the area to be connect, so as to eliminate a maximum of folds in the shrink film.

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 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.

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 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 height 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.

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 fan 24 is actuated simultaneously in suction mode to take the relay of the mechanical action of the fingers 52, the pliers 54 and the 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.

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 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 guying 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.

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.
The waterproof glass packaging concept implemented according to the successive stages mentioned above, allows:
  • to ensure the retraction of the film on the same station reserved for the cover,
  • to keep the cover 18 in engagement with the clamps 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 the pleating mechanism 60 just before heat sealing.

Claims (13)

Procédé de houssage et de thermoscellage d'une housse (18) ou gaine souple en matière plastique thermorétractable palettisée pour constituer un emballage étanche sur une charge (CH) en effectuant les opérations suivantes : enfiler la housse (18) sur la charge (CH) 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 (18) avec de l'air chaud, issu d'un cadre de rétraction (39) déplaçable le long de la surface latérale de la housse (18), gonfler la housse (18) avec de l'air de soufflage pour éviter les plis pendant la course de descente du cadre de rétraction (39), et thermosceller l'extrémité de la gaine au tapis de sol (16) en fin de course du cadre de rétraction (39) après avoir aspiré l'air emprisonné dans la housse (18), caractérisé en ce que le film de la housse (18) est tendu sur les quatre faces par les moyens de préhension durant la course du cadre de rétraction (39) pour garantir le thermoscellage de la zone à raccorder.Method of covering and heat-sealing a cover (18) or flexible sheath of heat-shrinkable plastic material palletized to form a sealed package on a load (CH) by performing the following operations: put the cover (18) on the load (CH) by pulling it down and keeping it open at the four corners of the quadrangular end by gripping means, heating the cover (18) with hot air, coming from a retraction frame (39) movable along the lateral surface of the cover (18), inflate the cover (18) with blowing air to avoid creases during the downward stroke of the retraction frame (39), and heat-seal the end of the sheath to the floor mat (16) at the end of the travel of the retraction frame (39) after having sucked the air trapped in the cover (18), characterized in that the film of the cover (18) is stretched on all four sides by the gripping means during the stroke of the retraction frame (39) to guarantee the heat sealing of the area to be connected. Procédé de houssage et de thermoscellage selon la revendication 1, caractérisé en ce que le surplus de périmètre à l'extrémité de la gaine (18) est reporté localement contre les quatre coins de la palette (14) avant le thermoscellage.The method of covering and heat sealing according to claim 1, characterized in that the excess perimeter at the end of the sheath (18) is transferred locally against the four corners of the pallet (14) before the heat sealing. Procédé de houssage et de thermoscellage selon la revendication 1 ou 2, caractérisé en ce que l'air est aspiré de manière à évacuer l'air emprisonné, et à positionner la zone à raccorder sous le plancher supérieur de la palette (14). Method of covering and heat sealing according to claim 1 or 2, characterized in that the air is sucked so as to evacuate the trapped air, and to position the area to be connected under the upper floor of the pallet (14). Procédé de houssage et de thermoscellage selon la revendication 3, caractérisé en ce que le positionnement de la zone à raccorder s'effectue par pliage.Method of covering and heat sealing according to claim 3, characterized in that the positioning of the zone to be connected is effected by folding. Procédé de houssage et de thermoscellage selon l'une des revendications 1 à 4, caractérisé en ce que le surplus de film reporté localement dans les quatre angles inférieurs, crée un haubanage après le thermoscellage, de manière à renforcer la résistance mécanique à la base de la housse étanche.Method of covering and heat sealing according to one of claims 1 to 4, characterized in that the excess film transferred locally in the four lower corners, creates a shrouding after the heat sealing, so as to reinforce the mechanical resistance at the base of the waterproof cover. Dispositif de houssage et de thermoscellage d'une housse en matière plastique thermorétractable sur une charge (CH) palettisée renfermant notamment des contenants (10) en verre, et comportant : des moyens pour enfiler la housse (18) sur la charge (CH) en tirant vers le bas et en la maintenant ouverte aux quatre angles de l'extrémité quadrangulaire par des moyens de préhension, des moyens pour chauffer la housse (18) avec de l'air chaud, issu d'un cadre de rétraction (39) le long de la surface extérieure de la housse (18), des moyens pour gonfler la housse (18) avec de l'air de soufflage pour éviter les plis pendant la course de descente du cadre de rétraction (39), et des moyens pour thermosceller l'extrémité de la gaine au tapis de sol (16) en fin de course du cadre de rétraction (39) après avoir aspiré l'air emprisonné dans la housse (18), caractérisé en ce que les moyens de préhension (48) sont montés mobiles sur un premier montant (36) du dispositif de houssage (32), et comportent une pluralité de doigt (52) et pinces (54) pour assurer la saisie aux quatre coins de la housse ouverte pendant la course du cadre de rétraction (39).Device for covering and heat-sealing a cover made of heat-shrinkable plastic on a palletized load (CH) containing in particular glass containers (10), and comprising: means for threading the cover (18) onto the load (CH) by pulling down and keeping it open at the four angles of the quadrangular end by gripping means, means for heating the cover (18) with hot air, coming from a retraction frame (39) along the outside surface of the cover (18), means for inflating the cover (18) with blowing air to prevent wrinkles during the downward stroke of the retraction frame (39), and means for heat-sealing the end of the sheath to the floor mat (16) at the end of the travel of the retraction frame (39) after having sucked the air trapped in the cover (18), characterized in that the gripping means (48) are movably mounted on a first upright (36) of the covering device (32), and comprise a plurality of fingers (52) and clamps (54) to ensure gripping at the four corners of the cover opened during the travel of the retraction frame (39). Dispositif de houssage et de thermoscellage selon la revendication 6, caractérisé en ce que les moyens de préhension (48) comportent un mécanisme de plissage (60) ayant une paire de leviers de commande (62) disposés de part et d'autre de chaque pince (54) pour reporter le surplus de périmètre à l'extrémité de la gaine (18) contre les quatre coins de la palette (14) avant le thermoscellage.Covering and heat sealing device according to claim 6, characterized in that the gripping means (48) comprise a pleating mechanism (60) having a pair of control levers (62) arranged on either side of each clamp (54) to transfer the excess perimeter at the end of the sheath (18) against the four corners of the pallet (14) before heat sealing. Dispositif de houssage et de thermoscellage selon la revendication 7, caractérisé en ce que chaque paire de leviers de commande (62) est montée à pivotement entre une position inactive basculée à l'arrière de la pince (54) et du doigt (52) associé, en étant écartée du film de la house (18), et une position active sollicitant l'extrémité de la gaine contre le tapis de sol (16) sur les quatre faces de la palette (14) tout en maintenant une tension transversale sur le film.Covering and heat sealing device according to claim 7, characterized in that each pair of control levers (62) is pivotally mounted between an inactive position tilted at the rear of the clamp (54) and the associated finger (52) , being separated from the film of the house (18), and an active position urging the end of the sheath against the floor mat (16) on the four faces of the pallet (14) while maintaining transverse tension on the movie. Dispositif de houssage et de thermoscellage selon l'une des revendications 6 à 8, caractérisé en ce que un ventilateur (24) réversible est disposé sous la palette (14), et est commutable soit en mode de soufflage pendant le chauffage de la gaine (18) lors du mouvement de descente du cadre de rétraction (39), soit en mode aspiration pour évacuer l'air emprisonné dans la housse avant de thermosceller.Covering and heat sealing device according to one of claims 6 to 8, characterized in that a reversible fan (24) is arranged under the pallet (14), and is switchable either in blowing mode during heating of the sheath ( 18) during the downward movement of the retraction frame (39), either in suction mode to evacuate the air trapped in the cover before heat sealing. Dispositif de houssage et de thermoscellage selon l'une des revendications 8 ou 9, caractérisé en ce que l'ensemble des doigts (52), pinces (54) et leviers (62) du mécanisme de plissage (60) est dégagé du film de la housse (18) pour optimiser le thermoscellage et la rétraction finale dans les quatre angles inférieurs, de manière à créer un haubanage (63) dans chaque angle.Hooding and heat sealing device according to one of claims 8 or 9, characterized in that the assembly of the fingers (52), pliers (54) and levers (62) of the pleating mechanism (60) is released from the film of the cover (18) to optimize the heat sealing and the final shrinkage in the four lower corners, so as to create a guying (63) in each corner. Dispositif de houssage et de thermoscellage selon la revendication 6, caractérisé en ce que la gaine de la housse (18) est mise en forme sur un rouleau accumulateur (40) motorisé monté sur un bras de transfert (44) mobile d'un robot de préhension. Covering and heat-sealing device according to claim 6, characterized in that the sheath of the cover (18) is shaped on a motorized accumulator roller (40) mounted on a transfer arm (44) movable by a robot. gripping. Dispositif de houssage et de thermoscellage selon la revendication 11, caractérisé en ce que le cadre de rétraction (39) est mobile entre une position relevée et une position abaissée sur un deuxième montant (38) du dispositif de rétraction (34), lequel est monté en opposition par rapport au dispositif de houssage (32).Covering and heat sealing device according to claim 11, characterized in that the retraction frame (39) is movable between a raised position and a lowered position on a second upright (38) of the retraction device (34), which is mounted in opposition to the covering device (32). Procédé de houssage et de thermoscellage d'une housse (18) ou gaine souple en matière plastique thermorétractable palettisée pour constituer un emballage étanche sur une charge (CH) en effectuant les opérations suivantes : enfiler la housse (18) sur la charge (CH) 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 (18) avec de l'air chaud, issu d'un cadre de rétraction (39) déplaçable le long de la surface latérale de la housse (18), et thermosceller l'extrémité de la gaine au tapis de sol (16) en fin de course du cadre de rétraction (39), caractérisé en ce que le film de la housse (18) est tendu sur les quatre faces par les moyens de préhension durant la course du cadre de rétraction (39), le surplus de périmètre à l'extrémité de la gaine (18) étant reporté localement contre les quatre coins de la palette (14) avant le thermoscellage.Method of covering and heat-sealing a cover (18) or flexible sheath of heat-shrinkable plastic material palletized to form a sealed package on a load (CH) by performing the following operations: put the cover (18) on the load (CH) by pulling it down and keeping it open at the four corners of the quadrangular end by gripping means, heating the cover (18) with hot air, coming from a retraction frame (39) movable along the lateral surface of the cover (18), and heat-seal the end of the sheath to the floor mat (16) at the end of the retraction frame (39), characterized in that the film of the cover (18) is stretched on all four sides by the gripping means during the stroke of the retraction frame (39), the excess perimeter at the end of the sheath (18) being transferred locally against the four corners of the pallet (14) before heat sealing.
EP01410152A 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 Expired - Lifetime EP1207109B1 (en)

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

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EP1207109A1 true EP1207109A1 (en) 2002-05-22
EP1207109B1 EP1207109B1 (en) 2004-11-03

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EP (1) EP1207109B1 (en)
AT (1) ATE281358T1 (en)
DE (1) DE60106845T2 (en)
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FR (1) FR2816587B1 (en)

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FR2869876A1 (en) * 2004-05-07 2005-11-11 Thimon Sa Procedure and apparatus for covering a palleted load with a pleated plastic sleeve uses grippers activated to reduce tension in sleeve before opening it
FR3069232A1 (en) * 2017-07-24 2019-01-25 Thimon METHOD OF HOUSING AND THERMOSCELLING AND DEVICE FOR HOUSING AND THERMOSCELLING
WO2019020930A1 (en) * 2017-07-24 2019-01-31 Thimon Covering and heat-sealing method
KR20200017116A (en) * 2018-08-08 2020-02-18 (주)범영인터팩 Stretch hood film packing system

Also Published As

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ATE281358T1 (en) 2004-11-15
DE60106845D1 (en) 2004-12-09
ES2232579T3 (en) 2005-06-01
DE60106845T2 (en) 2005-11-10
FR2816587A1 (en) 2002-05-17
FR2816587B1 (en) 2003-03-07
EP1207109B1 (en) 2004-11-03

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