EP1048572B1 - Method and machine for heat shrinking a thermoplastic sleeve around a palletized load - Google Patents
Method and machine for heat shrinking a thermoplastic sleeve around a palletized load Download PDFInfo
- Publication number
- EP1048572B1 EP1048572B1 EP20000410042 EP00410042A EP1048572B1 EP 1048572 B1 EP1048572 B1 EP 1048572B1 EP 20000410042 EP20000410042 EP 20000410042 EP 00410042 A EP00410042 A EP 00410042A EP 1048572 B1 EP1048572 B1 EP 1048572B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hot air
- hood
- opening
- shrinking
- sleeve
- 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
- 238000000034 method Methods 0.000 title claims description 8
- 229920001169 thermoplastic Polymers 0.000 title 1
- 239000004416 thermosoftening plastic Substances 0.000 title 1
- 230000000694 effects Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- UHZZMRAGKVHANO-UHFFFAOYSA-M chlormequat chloride Chemical compound [Cl-].C[N+](C)(C)CCCl UHZZMRAGKVHANO-UHFFFAOYSA-M 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
Definitions
- the invention relates to a method of shrinking a plastic cover. heat shrinkable generally covering a palletized load.
- Document FR-A-2 564 033 (the preambles of claims 1 and 3 are based on this state of the art) more particularly describes a process consisting to channel the hot air with a flexible hood carried by an upper plate mobile, the height of the hood being variable depending on the interval between the retraction frame and the plate.
- An exhaust opening is provided in the central part of the tray to allow extraction towards outside the building.
- the trapped hot air in the hood can be recycled in the burner and reused.
- an insulated capacity is mounted fixed by relative to the hot air generator, but is movable relative to the load.
- the assembly is completed by a horizontal piston fixed relative to this load authorizing a recycling of the hot air trapped in the capacity.
- the space delimited by the retractable cover is pressurized by fresh air to cause the cover to swell, the thermal energy for the shrinkage of the cover being brought by a jet of hot gas applied from the outside.
- the main advantage of these closed enclosures arranged above the frames retraction consists of confining the hot air so as to promote homogeneity of the temperature around the film to be shrunk.
- the presence of the enclosure also impedes the visibility of the operation of retraction, and makes it more difficult for operators to adjust the machine.
- the invention aims to remedy these drawbacks, and to propose a method and a shrinking machine to increase yield and performance for heating and shrinking heat shrinkable films.
- the hot air is channeled against the sheath by braking the effect of natural convection by adjusting a first outlet opening formed in the upper part of the hood, and by a space provided between the hood and a frame retraction mounted on the mobile carriage, the circulation of hot air taking place by a first path exhaust through the first opening at the top, and through a second lateral exhaust path through a second opening at the vicinity of said spacing.
- the air flow of the first exhaust path is adjustable by modification of the first upper opening depending on the surface of the sheath shrinkable, and the nature of the packaged products.
- the adjustment of the upper opening allows a homogeneous circulation to be obtained of the hot air flow which, leaving the retraction frame will strike the sheath substantially at the outlet height of this hot air.
- the air then rises by convection along the load, and partially escapes from the hood through the first upper opening.
- the rest of the air flow goes down along from the hood to escape through the second side opening.
- Such a circuit of regular air optimizes the heat exchange of the hot air leaving the generator, and the visibility of the shrinkage of the film is preserved.
- the machine comprises means for supplying and evacuating palletized loads, means of production and distribution of hot air having a hot air generator and a retraction frame mounted on a carriage movable in the vertical direction, and means for recovering hot air including a flexible hood.
- the hood has an upper part secured to a first plate of the fixed frame, and a lower part subject to a second movable plate, which is connected to the retraction frame by spacers. Openings are made in the upper part of the hood and in the space between the hood and the hot air generator for create two exhaust paths for the used hot air.
- the upper opening of the hood is adjustable in section by a hatch manual or automatic closing by a motorized actuator, for example a pneumatic, hydraulic or electric cylinder.
- a motorized actuator for example a pneumatic, hydraulic or electric cylinder.
- the retraction cycle consists in the vast majority of cases to ensure first, the shrinkage of the film under the load support pallet, the latter being raised above the handling table.
- the load is placed on this table, the film then being pinched between the pallet support and table.
- the retraction frame then moves vertically from bottom up, and thus ensures the retraction of the entire vertical part of the sheath.
- the palletized load 1 is transferred to the center of the machine by a chain or roller table 3.
- a framework of retraction 4 slides vertically along the chassis 5 via a mobile carriage 16.
- a second horizontal plate 6 is subject to the mobile retraction frame 4 by spacers 17, and is equipped with a flexible hood 7 produced in one material resistant to temperatures between 150 ° C and 200 ° C.
- the part upper part of the hood 7 is fixed to the first fixed plate 8.
- the length of the spacers 17 determines the spacing between the hood 7 and the retraction frame 4, said spacing preferably being between 200 mm and 400 mm.
- the first fixed plate 8 has a first opening 9 of square section, cooperating with a closing hatch 10, manual or adjustable automatic by means of a pneumatic, hydraulic or electric, intended to partially close said opening 9.
- the hot air generator consists of a set of 15 linear burners distributed in the form of a four-sided ring placed horizontally around the load 1.
- the heat source is at a sufficient distance from the sheath 2 to retract, the flame being enclosed in a box, and only the hot air of combustion is channeled to the sheath 2 to cause the retraction effect.
- the air-gas pre-mix burner sections make available a high calorific power necessary to ensure rates up to 200 products / hour.
- the diffusion of this premix to each burner 15 can be operated through a porous bronze plate ensuring good flame attachment.
- An ignition device with progressive opening of the pre-mixing also provides excellent combustion quality.
- This type of burner has a very low thermal inertia compared to systems with sheet metal hot air ducting, causing significant variations in air temperature on the product depending on the deviations instant production volume.
- the hot air generator is not in service, because the carriage 16 is found in a raised inactive position.
- FIG. 2 and 3 Operation is shown in Figures 2 and 3, after lowering the retraction frame 4 towards the active position lowered to the level of the table 3.
- a fan 13 draws combustion air through a filter 12, propels it into a mixer 14 supplied with natural gas, for example propane or any other gas, then to a burner 15 in connection with distribution means arranged according to a closed ring.
- natural gas for example propane or any other gas
- the hot air is channeled towards the cover 2, and the heating time allowing the plastic film to be brought to its shrinking temperature, is adjustable either by a delay action, or by an adjustment of the speed of moving the retraction frame 4.
- FIG. 2 represents the phase of retraction of the lateral faces of the cover 2, the closing hatch 10 being in a first partially closed position of the first opening 9.
- the hot air flow D1 from the generator heat is directed horizontally against the sheath 2 retractable over its entire perimeter, then rises by natural convection in enclosure E delimited by the hood 7 and the palletized load 1.
- Part D2 of the hot air flow after heating the film of the cover 2 over most of its height above from the generator, escapes through the first opening 9.
- Another part D3 hot air having heated film 2 escapes laterally above the generator 4 through the second opening 20.
- the shutter hatch 10 adjusts part of the load palletized, allowing optimum performance after guiding the hot air against film 2 by protecting it against the action of possible drafts and significant loss of calories.
- the adjustment of the first exhaust opening 9 makes it possible to process all of the palletized loads 1 whose products require retraction without preheating of the retractable sheath 2, these products being mainly film-wrapped products.
- a rise in temperature and cooling of the sheath 2 reduces the increase in temperature of the grouping film partially in contact with it, and thus avoids any heat-sealing effect of the film.
- a machine processing different products can be provided with identification means the nature of the palletized loads during the introduction phase into the machine, to automatically adjust the opening 9 in order to optimize the quality of retraction.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
Description
L'invention concerne un procédé de rétraction d'une housse plastique thermorétractable recouvrant généralement une charge palettisée.The invention relates to a method of shrinking a plastic cover. heat shrinkable generally covering a palletized load.
Il est connu d'utiliser un cadre de rétraction à air chaud associé à une hotte pour répartir et conserver l'air chaud autour des produits à chauffer, tout en limitant l'effet de convection naturelle.It is known to use a hot air shrinkage frame associated with a hood for distribute and keep the hot air around the products to be heated, while limiting the effect of natural convection.
Le document FR-A-2 564 033
(les préambules des revendications 1 et 3 sont
basés sur cet état de la technique)
décrit plus particulièrement un procédé consistant
à canaliser l'air chaud avec une hotte souple portée par un plateau supérieur
mobile, la hauteur de la hotte étant variable en fonction de l'intervalle ménagé
entre le cadre de rétraction et le plateau. Une ouverture d'échappement est
prévue dans la partie centrale du plateau pour permettre une extraction vers
l'extérieur du bâtiment. On envoie l'air chaud vers la zone annulaire de la gaine à
chauffer, et on déplace progressivement cette zone à chauffer sur la gaine selon
un mouvement de coulissement vertical de bas en haut. L'air chaud emprisonné
dans la hotte peut être recyclé dans le brûleur et réutilisé.Document FR-A-2 564 033
(the preambles of
Selon le document FR-A-2 082 861, une capacité calorifugée est montée fixe par rapport au générateur d'air chaud, mais est mobile par rapport à la charge. L'ensemble est complété par un piston horizontal fixe par rapport à cette charge autorisant un recyclage de l'air chaud emprisonné dans la capacité.According to document FR-A-2 082 861, an insulated capacity is mounted fixed by relative to the hot air generator, but is movable relative to the load. The assembly is completed by a horizontal piston fixed relative to this load authorizing a recycling of the hot air trapped in the capacity.
Le document US-A-3 662 512 décrit un générateur d'air chaud, en forme de cadre horizontal complété par un caisson rigide, lequel est mobile avec le cadre. L'air chaud est introduit à partir de la partie supérieure de la hotte qui le répartit autour de la charge.Document US-A-3,662,512 describes a hot air generator, in the form of horizontal frame completed by a rigid box, which is movable with the frame. Hot air is introduced from the top of the hood which distributes it around the load.
Selon le document EP-A-116124, l'espace délimité par la housse rétractable est mis en surpression par de l'air frais pour provoquer le gonflement de la housse, l'énergie thermique pour la rétraction de la housse étant amenée par un jet de gaz chaud appliqué de l'extérieur.According to document EP-A-116124, the space delimited by the retractable cover is pressurized by fresh air to cause the cover to swell, the thermal energy for the shrinkage of the cover being brought by a jet of hot gas applied from the outside.
L'avantage principal de ces enceintes fermées agencées au-dessus des cadres de rétraction, consiste à confiner l'air chaud de manière à favoriser l'homogénéité de la température autour du film à rétracter.The main advantage of these closed enclosures arranged above the frames retraction, consists of confining the hot air so as to promote homogeneity of the temperature around the film to be shrunk.
Cependant, lorsque la charge est constituée par des packs de bouteilles d'eau minérale sous film plastique, l'effet de rétraction peut engendrer un préchauffage de la gaine favorisant son collage sur le film plastique des packs. Ce collage par thermo-scellage est ensuite à l'origine de difficultés lors de la dépalettisation.However, when the load consists of packs of water bottles mineral in plastic film, the shrinking effect can cause preheating sheath favoring its bonding on the plastic film of the packs. This collage by heat-sealing is then the source of difficulties during depalletization.
La présence de l'enceinte gêne d'autre part la visibilité de l'opération de rétraction, et rend plus difficile le réglage de la machine par les opérateurs.The presence of the enclosure also impedes the visibility of the operation of retraction, and makes it more difficult for operators to adjust the machine.
L'invention vise à remédier à ces inconvénients, et à proposer un procédé et une machine de rétraction permettant d'augmenter le rendement et les performances pour le chauffage et la rétraction des films thermorétractables.The invention aims to remedy these drawbacks, and to propose a method and a shrinking machine to increase yield and performance for heating and shrinking heat shrinkable films.
Selon le procédé de l'invention, on canalise l'air chaud contre la gaine en freinant l'effet de convection naturelle par le réglage d'une première ouverture de sortie ménagée dans la partie supérieure de la hotte, et par un espacement ménagé entre le hotte et un cadre de rétraction monté sur le chariot mobile, la circulation de l'air chaud s'effectuant par un premier trajet d'échappement à travers la première ouverture à la partie supérieure, et par un deuxième trajet d'échappement latéral à travers une deuxième ouverture au voisinage dudit espacement.According to the method of the invention, the hot air is channeled against the sheath by braking the effect of natural convection by adjusting a first outlet opening formed in the upper part of the hood, and by a space provided between the hood and a frame retraction mounted on the mobile carriage, the circulation of hot air taking place by a first path exhaust through the first opening at the top, and through a second lateral exhaust path through a second opening at the vicinity of said spacing.
L'écoulement d'air du premier trajet d'échappement est réglable par modification de la première ouverture supérieure en fonction de la surface de la gaine thermorétractable, et de la nature des produits emballés.The air flow of the first exhaust path is adjustable by modification of the first upper opening depending on the surface of the sheath shrinkable, and the nature of the packaged products.
Le réglage de l'ouverture supérieure permet d'obtenir une circulation homogène du flux d'air chaud qui, sortant du cadre de rétraction va frapper la gaine sensiblement à la hauteur de sortie de cet air chaud. L'air remonte ensuite par convection le long de la charge, et s'échappe partiellement de la hotte par la première ouverture supérieure. Le reste de l'écoulement d'air redescend le long de la hotte pour s'échapper à travers la deuxième ouverture latérale. Un tel circuit d'air régulier optimise l'échange thermique de l'air chaud sortant du générateur, et la visibilité de la rétraction du film est préservée.The adjustment of the upper opening allows a homogeneous circulation to be obtained of the hot air flow which, leaving the retraction frame will strike the sheath substantially at the outlet height of this hot air. The air then rises by convection along the load, and partially escapes from the hood through the first upper opening. The rest of the air flow goes down along from the hood to escape through the second side opening. Such a circuit of regular air optimizes the heat exchange of the hot air leaving the generator, and the visibility of the shrinkage of the film is preserved.
La machine selon l'invention comporte des moyens d'amenée et d'évacuation de charges palettisées, des moyens de production et de distribution d'air chaud ayant un générateur d'air chaud et un cadre de rétraction montés sur un chariot mobile dans le sens vertical, et des moyens de récupération de l'air chaud comprenant une hotte souple. La hotte comporte une partie supérieure solidarisée à un premier plateau du châssis fixe, et une partie inférieure assujettie à un deuxième plateau mobile, lequel est relié au cadre de rétraction par des entretoises. Des ouvertures sont ménagées dans la partie supérieure de la hotte et dans l'espacement entre la hotte et le générateur d'air chaud pour créer deux trajets d'échappement de l'air chaud usé.The machine according to the invention comprises means for supplying and evacuating palletized loads, means of production and distribution of hot air having a hot air generator and a retraction frame mounted on a carriage movable in the vertical direction, and means for recovering hot air including a flexible hood. The hood has an upper part secured to a first plate of the fixed frame, and a lower part subject to a second movable plate, which is connected to the retraction frame by spacers. Openings are made in the upper part of the hood and in the space between the hood and the hot air generator for create two exhaust paths for the used hot air.
L'ouverture supérieure de la hotte est réglable en section par une trappe de fermeture à commande manuelle ou automatique par un actionneur motorisé, par exemple un vérin pneumatique, hydraulique ou électrique.The upper opening of the hood is adjustable in section by a hatch manual or automatic closing by a motorized actuator, for example a pneumatic, hydraulic or electric cylinder.
Le cycle de rétraction consiste dans la grande majorité des cas à assurer d'abord, la rétraction du film sous la palette support de la charge, celle-ci étant surélevée par rapport à la table de manutention. The retraction cycle consists in the vast majority of cases to ensure first, the shrinkage of the film under the load support pallet, the latter being raised above the handling table.
La charge est posée sur cette table, le film étant alors pincé entre la palette support et la table. Le cadre de rétraction se déplace ensuite verticalement de bas en haut, et assure ainsi la rétraction de toute la partie verticale de la gaine.The load is placed on this table, the film then being pinched between the pallet support and table. The retraction frame then moves vertically from bottom up, and thus ensures the retraction of the entire vertical part of the sheath.
- la figure 1 est une vue en coupe de la machine de rétraction selon l'invention, le cadre de rétraction étant en position inactive ;Figure 1 is a sectional view of the retraction machine according to the invention, the retraction frame being in the inactive position;
- les figures 2 et 3 montrent des vues identiques de la figure 1, le cadre de rétraction étant en position active, respectivement avec deux réglages différents de la circulation d'air à l'intérieur de la hotte.Figures 2 and 3 show identical views of Figure 1, the frame of retraction in active position, respectively with two different settings air circulation inside the hood.
Sur la figure 1 , la charge palettisée 1 est transférée au centre de la machine par
une table à chaínes ou à rouleaux 3 .Une housse 2 constituée à partir d'une
gaine de plastique thermorétractable, recouvre la surface latérale et la surface
horizontale supérieure de la charge 1 palettisée.In Figure 1, the palletized
Un châssis 5 fixe conformé en portique vertical, porte un premier plateau 8 fixe
placé horizontalement au-dessus de la charge 1 palettisée. Un cadre de
rétraction 4 coulisse verticalement le long du châssis 5 par l'intermédiaire d'un
chariot mobile 16.A
Un deuxième plateau 6 horizontal est assujetti au cadre de rétraction 4 mobile
par des entretoises 17, et est équipé d'une hotte 7 souple réalisée en une
matière résistant à des températures comprises entre 150°C et 200°C. La partie
supérieure de la hotte 7 est fixée au premier plateau fixe 8.A second
La longueur des entretoises 17 détermine l'espacement entre la hotte 7 et le
cadre de rétraction 4, ledit espacement étant compris de préférence entre 200
mm et 400 mm.The length of the
Le premier plateau 8 fixe est dotée d'une première ouverture 9 de section carrée,
coopérant avec une trappe de fermeture 10, à réglage manuel ou à réglage
automatique par l'intermédiaire d'un vérin 11 pneumatique, hydraulique ou
électrique, destiné à obturer partiellement ladite ouverture 9. The first
Le générateur d'air chaud est constitué par un ensemble de brûleurs 15 linéaires
réparti sous forme d'anneau à quatre côtés placés horizontalement autour de la
charge 1. La source de chaleur est à une distance suffisante de la gaine 2 à
rétracter, la flamme étant enfermée dans un caisson, et seul l'air chaud de
combustion est canalisé vers la gaine 2 pour provoquer l'effet de rétraction.The hot air generator consists of a set of 15 linear burners
distributed in the form of a four-sided ring placed horizontally around the
Les tronçons de brûleurs à pré-mélange air-gaz rendent disponible une forte
puissance calorifique nécessaire pour assurer des cadences pouvant atteindre
200 produits/ heure. La diffusion de ce pré-mélange vers chaque brûleur 15 peut
être opérée par l'intermédiaire d'une plaque de bronze poreux assurant un bon
accrochage de la flamme. Un dispositif d'allumage avec ouverture progressive du
pré-mélange permet également d'obtenir une excellente qualité de combustion.
Ce type de brûleurs possède une très faible inertie thermique par rapport à des
systèmes comportant des tôleries de canalisation de l'air chaud, entraínant des
variations importantes de température d'air sur le produit en fonction des écarts
de volume instantané de production.The air-gas pre-mix burner sections make available a high
calorific power necessary to ensure rates up to
200 products / hour. The diffusion of this premix to each
Sur la figure 1, le générateur d'air chaud n'est pas en service, car le chariot 16 se
trouve dans une position inactive relevée.In FIG. 1, the hot air generator is not in service, because the
Le fonctionnement est représenté sur les figures 2 et 3, après avoir descendu le
cadre de rétraction 4 vers la position active abaissée au niveau de la table 3. Un
ventilateur 13 aspire l'air de combustion au travers d'un filtre 12, le propulse dans
un mélangeur 14 alimenté en gaz naturel, par exemple du propane ou tout autre
gaz, puis vers un brûleur 15 en liaison avec des moyens de distribution agencés
selon un anneau fermé .Operation is shown in Figures 2 and 3, after lowering the
L'air chaud est canalisé en direction de la housse 2, et le temps de chauffage
permettant de porter le film plastique à sa température de rétraction, est réglable
soit par une action de temporisation, soit par un ajustement de la vitesse de
déplacement du cadre de rétraction 4.The hot air is channeled towards the
La figure 2 représente la phase de rétraction des faces latérales de la housse 2,
la trappe de fermeture 10 étant dans une première position d'obturation partielle
de la première ouverture 9. L'air chaud de débit D1 en provenance du générateur
de chaleur, est dirigé horizontalement contre la gaine 2 rétractable sur tout son
périmètre, puis remonte par convection naturelle dans l'enceinte E délimitée par
la hotte 7 et la charge palettisée 1. Une partie D2 de l'écoulement d'air chaud,
après avoir chauffé le film de la housse 2 sur la majeure partie de sa hauteur au-dessus
du générateur, s'échappe par la première ouverture 9. Une autre partie
D3 de l'air chaud ayant chauffé le film 2, s'échappe latéralement au dessus du
générateur 4 à travers la deuxième ouverture 20.FIG. 2 represents the phase of retraction of the lateral faces of the
Le réglage de la trappe d'obturation 10 permet de traiter une partie des charges
palettisées, en permettant un rendement optimum après guidage de l'air chaud
contre le film 2 en le protégeant contre l'action de courants d'air éventuels et de
déperditions importantes de calories.The
Sur la figure 3, la trappe 10 est ajustée pour obtenir une obturation plus
importante de la première ouverture 9. Une très faible partie d2 du débit d'air
chaud D1 sortant du générateur, est évacuée par la première ouverture 9, et le
préchauffage du film 2 dans l'enceinte E de la hotte 7 est pratiquement
supprimé, étant donné que l'air D3 s'échappe principalement par la deuxième
ouverture 20 au- dessus du générateur.In Figure 3, the
Le réglage de la première ouverture 9 d'échappement permet de traiter toutes les
charges palettisées 1 dont les produits nécessitent une rétraction sans
préchauffage de la gaine 2 rétractable, ces produits étant principalement des
produits emballés sous film. Une montée en température et un refroidissement
rapide de la gaine 2 réduit l'augmentation de température du film de groupage
partiellement au contact avec celle-ci, et évite ainsi tout effet de thermo-scellage
du film.The adjustment of the first exhaust opening 9 makes it possible to process all of the
palletized
Une machine traitant différents produits peut être muni de moyens d'identification
de la nature des charges palettisées lors de la phase d'introduction dans la
machine, pour ajuster automatiquement l'ouverture 9 afin d'optimiser la qualité de
rétraction.A machine processing different products can be provided with identification means
the nature of the palletized loads during the introduction phase into the
machine, to automatically adjust the
Claims (5)
- Method for shrinking a flexible sleeve formed by a film made of heat-shrinkable plastic material covering a palettized load, and consisting:characterized in that the hot air is channeled against the sleeve (2) slowing down the natural convection effect by adjustment of a first outlet opening (9) arranged in the top part of the hood (7), and by a space arranged between the hood (7) and a retraction frame (4) mounted on the mobile carriage (16), flow of the hot air taking place via a first outlet path through the first opening (9) at the top part, and via a lateral second outlet path through a second opening (20) located near to said space.in propelling hot air into an annular heating zone around the sleeve (2) by means of a hot air generator mounted on a moving carriage (16),and in positioning an extensible hood (7) above the palettized load (1) to confine the hot air during the heating and shrinking phases of the sleeve (2),
- The method for shrinking a flexible sleeve according to claim 1, characterized in that the air flow of the first outlet path is adjustable by modifying the first top opening (9) according to the surface of the heat-shrinkable sleeve (2) to be heated and to the nature of the packaged products.
- Machine for shrinking a flexible sleeve formed by a film made of heat-shrinkable plastic material covering a palettized load (1), and comprising:characterized in thatmeans for bringing and removing the palettized loads,means for producing and distributing hot air having a hot air generator and a retraction frame (4) mounted on a moving carriage (16) in the vertical direction,and means for recovering hot air comprising a flexible hood (7),the hood (7) comprises a top part securedly attached to a first plate (8) of the fixed frame (5), and a bottom part secured to a second mobile plate (6) which is joined to the retraction frame (4) by spacers (17),a first opening (9) is arranged in the top part of the hood (7) to create a first path for outlet of the hot air,and a second opening (20) is located in the space between the hood (7) and the hot air generator to create a second path for outlet of the hot air.
- Machine according to claim 3, characterized in that the first top opening (9) of the hood (7) is adjustable in cross-section by a manually-operated closing flap (10).
- Machine according to claim 3, characterized in that the first top opening (9) of the hood (7) is automatically adjustable by a motorized actuator, for example a pneumatic, hydraulic or electric jack.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9905414A FR2792610B1 (en) | 1999-04-26 | 1999-04-26 | PROCESS FOR SHRINKAGE OF A FLEXIBLE SHEATH IN THERMALLY SHRINKABLE PLASTIC MATERIAL ON A PALLETIZED LOAD, AND MACHINE FOR CARRYING OUT SAID METHOD |
| FR9905414 | 1999-04-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1048572A1 EP1048572A1 (en) | 2000-11-02 |
| EP1048572B1 true EP1048572B1 (en) | 2004-03-03 |
Family
ID=9544998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20000410042 Expired - Lifetime EP1048572B1 (en) | 1999-04-26 | 2000-04-26 | Method and machine for heat shrinking a thermoplastic sleeve around a palletized load |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1048572B1 (en) |
| DE (1) | DE60008619D1 (en) |
| FR (1) | FR2792610B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112537020B (en) * | 2020-11-20 | 2023-07-28 | 安徽东方旭电气设备有限公司 | Thermoplastic machine for electrical equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3662512A (en) | 1968-01-24 | 1972-05-16 | Weldotron Corp | Method and apparatus for shrink-film wrapping a pallet load |
| FR2082861A5 (en) | 1970-03-25 | 1971-12-10 | Hurdequint Louis | Shrink-wrapping oven - drops over a pack to shrink the bag mouth uniformly using directional hot air jets |
| ATE20015T1 (en) | 1982-12-30 | 1986-06-15 | Msk Verpackung Syst Gmbh | METHOD AND DEVICE FOR SHRINKING A SHRINK HOOD DRAFTED OVER A PARTICULARLY PALLETIZED STACK OF GOODS. |
| FR2564033B1 (en) | 1984-05-10 | 1987-01-02 | Thimon Ste Nouvelle Exploit | METHOD FOR HEATING - WITH A VIEW TO RETRACTING IT - A HEAT SHRINKABLE PLASTIC SHEATH COVERING A LOAD AND A MACHINE FOR CARRYING OUT THE METHOD |
| DE8513892U1 (en) * | 1985-05-10 | 1985-09-05 | MSK - Verpackungs-Systeme GmbH, 4190 Kleve | Device for covering and shrinking stacks of goods with shrink hoods |
| DE3834519A1 (en) * | 1988-10-11 | 1990-04-12 | Beumer Maschf Bernhard | Method and apparatus for wrapping piece goods with shrink foil |
-
1999
- 1999-04-26 FR FR9905414A patent/FR2792610B1/en not_active Expired - Lifetime
-
2000
- 2000-04-26 DE DE60008619T patent/DE60008619D1/en not_active Expired - Lifetime
- 2000-04-26 EP EP20000410042 patent/EP1048572B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1048572A1 (en) | 2000-11-02 |
| FR2792610A1 (en) | 2000-10-27 |
| FR2792610B1 (en) | 2001-07-13 |
| DE60008619D1 (en) | 2004-04-08 |
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