EP1486420A1 - Method and apparatus for packaging a load with a flexible heatshrinkable foil. - Google Patents

Method and apparatus for packaging a load with a flexible heatshrinkable foil. Download PDF

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Publication number
EP1486420A1
EP1486420A1 EP04354022A EP04354022A EP1486420A1 EP 1486420 A1 EP1486420 A1 EP 1486420A1 EP 04354022 A EP04354022 A EP 04354022A EP 04354022 A EP04354022 A EP 04354022A EP 1486420 A1 EP1486420 A1 EP 1486420A1
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EP
European Patent Office
Prior art keywords
load
hot air
envelope
air
packaging
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Granted
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EP04354022A
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German (de)
French (fr)
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EP1486420B1 (en
Inventor
Jean-Paul Charles Martin Cocher
Georges Jaconelli
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Thimon SAS
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Thimon SAS
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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

Definitions

  • Document EP-A-933297 describes a curtain packaging device making use of two films from two storage reels, intended for wrap a load, undergoing welding and sectioning.
  • the resulting envelope is open at both ends, and is then applied to the load by heat shrinking.
  • a first flow air is sent transversely from the inside to the edges and corners beyond the top and bottom of the load, and a second hot air flow is sent from the outside to the edges to ensure the retraction.
  • the first cold air flow is used to vertically straighten the protruding edges before the shrinking process, and comes from a tubing feed extending perpendicular to the upper face and to the face lower in the middle area of the load.
  • the shrinkage of the film on the load occurs by means of a heating frame framing the load and capable of mounting and go down on a frame.
  • a blowing nozzle is located in the middle above and below the load, by being connected to a source of compressed air, and comprising exhaust ports distributed angularly according to a ring, and oriented at an angle of 45 ° to the nozzle.
  • the flow of pressurized air at the outlet of the orifices is directed transversely towards the edges of the envelope, to straighten them while keeping the envelope open.
  • the first air flow serving to straighten the edges to keep the envelope open over its entire height is cold, and oriented in reverse with the hot shrink air from the second outside air flow.
  • the cold air coming into contact with the internal wall of each edge may disturb the retraction.
  • the object of the invention is to develop a method of packaging a load by means of a heat-shrinkable film making it possible to obtain a retraction regular and stretched film on top of the load.
  • the packaging method according to the invention is characterized in that the flow transverse air from the edge of the envelope, and the hot air from shrinkage come from the same hot air generator. Hot shrink air is directed successively from the inside to the outside, then from the outside to inside by moving the hot air generator at the start of its travel descent.
  • the deflection of the retraction air at the start of the displacement stroke of the hot air generator is operated by a deflector located in the vicinity of the middle zone above the load.
  • the speed of the transverse air flow directed towards the internal wall of the edge can be adjusted by means of an air intake device hot air generator.
  • the deflector is preferably movable vertically by pressing on the load during the retraction phase, and has a nozzle shape at convergent-divergent.
  • a hot air return fan from the hot air generator can be arranged above the load, to return the hot air against the inner wall of the upper edge of the envelope so as to increase the speed, and improve the heat exchange of shrinkage.
  • the fan can be replaced by any other means of extracting hot air, in particular a Venturi type nozzle.
  • a packaging device (10) of a load (CH) by means of an envelope (11) of flexible film of heat-shrinkable material comprises a hot air generator (12) constituted, for example, by a movable heating frame-shaped gas burner (13) for surrounding the load (CH) coated with the casing (11).
  • the charge (CH) is generally placed on a pallet (not shown) brought into the packing station by a conveyor, and the heating frame (13) can be moved up and down to heat shrink the film on the load (CH).
  • the film is made of polyethylene, but any other heat-shrinkable plastic material can be used.
  • the envelope (11) is open at its two lower and upper ends of so as to form a sleeve, and is made by a packaging process to curtain of the type described in document FR 2606 366, or by any other method.
  • the open upper edge (14) of the casing (11) is first raised vertically thanks to a transverse air flow coming from the hot air generator (12).
  • a deflector (15) is secured to a support (16) arranged in the middle zone above the upper face of the load (CH), so as to deflect the flow of hot air by 180 ° by directing towards the inner wall of the upper edge (14) at the start of the shrinkage of the envelope (11).
  • the support (16) of the deflector (15) can be fixed, but preferably mobile vertically by coming to bear on the load (CH) during retraction.
  • the frame (13) of the hot air generator (12) is connected by a bellows (18) to the frame of the hood (17) integral with the machine frame, said bellows being deformable during the downward movement of the frame (13).
  • the transverse air flow for raising the edge (14) upper part of the casing (11), and the hot retraction air comes from the same generator (12).
  • the hot air is used successively from the inside to the outside for raising the edge (14) upper, then from outside to inside for shrinking the film.
  • a fan (19) is associated with the deflector (15) to accelerate the return of hot air from the generator (12).
  • the speed of the transverse air flow towards the internal wall of the edge (14) is thus increased to improve the heat exchange of shrinkage.
  • the fan (19) of Figure 4 is replaced by any other pneumatic suction or blowing device, in particular a nozzle (20) of the Venturi type.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Package Closures (AREA)
  • Packages (AREA)
  • Basic Packing Technique (AREA)

Abstract

The method involves raising vertically an open edge of an envelope (11) to pass an upper surface of a load (CH) by a cross flow air directed towards internal surface of the open edge. A film on an outer lateral surface of the envelope is heated by a hot air to assure thermo-retraction of the film on the load. The cross flow air is hot for assuring a preheating of an internal wall of an upper edge (14) of the envelope. An independent claim is also included for a load package device.

Description

Domaine technique de l'inventionTechnical field of the invention

L'invention est relative à un procédé d'emballage d'une charge au moyen d'une enveloppe de film souple en matière thermorétractable, ayant un bord ouvert au niveau de la face supérieure de la charge, et consistant à :

  • relever verticalement le bord ouvert de l'enveloppe en le faisant dépasser de la face supérieure de la charge au moyen d'un écoulement d'air transversal dirigé vers la surface interne du bord ouvert,
  • et chauffer le film par de l'air chaud sur toute la surface latérale extérieure de l'enveloppe pour assurer la thermorétraction du film sur la charge,
The invention relates to a method of packaging a load by means of a flexible film envelope made of heat-shrinkable material, having an open edge at the level of the upper face of the load, and consisting in:
  • vertically raise the open edge of the envelope by making it protrude from the upper face of the load by means of a transverse air flow directed towards the internal surface of the open edge,
  • and heating the film with hot air over the entire outer lateral surface of the envelope to heat shrink the film on the load,

Etat de la techniqueState of the art

Le document EP-A-933297 décrit un dispositif d'emballage à rideau faisant usage de deux films en provenance de deux bobines de stockage, et destinés à envelopper une charge, en subissant des opérations de soudure et de sectionnement. L'enveloppe résultante est ouverte à ses deux extrémités, et est ensuite appliquée sur la charge par thermorétraction. Un premier écoulement d'air est envoyé transversalement de l'intérieur vers les bords et coins dépassant la face supérieure et la face inférieure de la charge, et un deuxième écoulement d'air chaud est envoyé de l'extérieur vers les bords pour assurer la rétraction. Le premier écoulement d'air froid sert à redresser verticalement les bords saillants avant le processus de rétraction, et est issu d'une tubulure d'alimentation s'étendant perpendiculairement à la face supérieure et à la face inférieure dans la zone médiane de la charge.Document EP-A-933297 describes a curtain packaging device making use of two films from two storage reels, intended for wrap a load, undergoing welding and sectioning. The resulting envelope is open at both ends, and is then applied to the load by heat shrinking. A first flow air is sent transversely from the inside to the edges and corners beyond the top and bottom of the load, and a second hot air flow is sent from the outside to the edges to ensure the retraction. The first cold air flow is used to vertically straighten the protruding edges before the shrinking process, and comes from a tubing feed extending perpendicular to the upper face and to the face lower in the middle area of the load.

Dans le document EP-A-1147050, la rétraction du film sur la charge intervient au moyen d'un cadre chauffant encadrant la charge et pouvant monter et descendre sur un bâti. Une buse de soufflage est située au milieu au-dessus et en-dessous de la charge, en étant reliée à une source d'air comprimé, et comprenant des orifices d'échappement répartis angulairement selon un anneau, et orientés avec un angle de 45° par rapport à la buse. L'écoulement d'air sous pression à la sortie des orifices est dirigé transversalement vers les bords de l'enveloppe, pour les redresser en maintenant l'enveloppe ouverte.In document EP-A-1147050, the shrinkage of the film on the load occurs by means of a heating frame framing the load and capable of mounting and go down on a frame. A blowing nozzle is located in the middle above and below the load, by being connected to a source of compressed air, and comprising exhaust ports distributed angularly according to a ring, and oriented at an angle of 45 ° to the nozzle. The flow of pressurized air at the outlet of the orifices is directed transversely towards the edges of the envelope, to straighten them while keeping the envelope open.

Dans les deux dispositifs précités, le premier écoulement d'air servant à redresser les bords pour tenir l'enveloppe ouverte sur toute sa hauteur, est froid, et orienté en sens inverse avec l'air chaud de rétraction du deuxième écoulement d'air extérieur. L'air froid venant en contact avec la paroi interne de chaque bord risque de perturber la rétraction.In the two aforementioned devices, the first air flow serving to straighten the edges to keep the envelope open over its entire height, is cold, and oriented in reverse with the hot shrink air from the second outside air flow. The cold air coming into contact with the internal wall of each edge may disturb the retraction.

Objet de l'inventionSubject of the invention

L'objet de l'invention consiste à élaborer un procédé d'emballage d'une charge au moyen d'un film thermorétractable permettant d'obtenir une rétraction régulière et tendue du film sur le dessus de la charge.The object of the invention is to develop a method of packaging a load by means of a heat-shrinkable film making it possible to obtain a retraction regular and stretched film on top of the load.

Le procédé d'emballage selon l'invention est caractérisé en ce que l'écoulement d'air transversal de relèvement du bord de l'enveloppe, et l'air chaud de rétraction proviennent du même générateur d'air chaud. L'air chaud de rétraction est dirigé successivement de l'intérieur vers l'extérieur, puis de l'extérieur vers l'intérieur en déplaçant le générateur d'air chaud au début de sa course de descente.The packaging method according to the invention is characterized in that the flow transverse air from the edge of the envelope, and the hot air from shrinkage come from the same hot air generator. Hot shrink air is directed successively from the inside to the outside, then from the outside to inside by moving the hot air generator at the start of its travel descent.

Il en résulte un effet de préchauffage de la paroi interne du bord supérieur de l'enveloppe, qui améliore la phase de rétraction du bord supérieur du film sur la face horizontale de la charge. La déviation de l'air de rétraction au début de la course de déplacement du générateur d'air chaud est opérée par un déflecteur se trouvant au voisinage de la zone médiane au-dessus de la charge.This results in a preheating effect of the inner wall of the upper edge of the envelope, which improves the shrinking phase of the upper edge of the film on the horizontal face of the load. The deflection of the retraction air at the start of the displacement stroke of the hot air generator is operated by a deflector located in the vicinity of the middle zone above the load.

La vitesse de l'écoulement d'air transversal dirigé vers la paroi interne du bord peut être ajustée au moyen d'un dispositif d'aspiration de l'air en provenance du générateur d'air chaud.The speed of the transverse air flow directed towards the internal wall of the edge can be adjusted by means of an air intake device hot air generator.

L'invention concerne également un dispositif d'emballage comportant :

  • un dispositif pour entourer la charge au moyen d'un film thermorétractable, et pour relever verticalement le bord supérieur ouvert de l'enveloppe par un écoulement d'air transversal,
  • un générateur d'air chaud formé par un cadre chauffant entourant l'enveloppe, et déplaçable de haut en bas pour assurer la thermorétraction du film et du bord supérieur sur la charge,
caractérisé en ce que le générateur d'air chaud coopère avec un déflecteur pour envoyer successivement l'écoulement d'air transversal, et l'air de rétraction respectivement sur la paroi interne, et la paroi externe du bord supérieur de l'enveloppe.The invention also relates to a packaging device comprising:
  • a device for surrounding the load by means of a heat-shrinkable film, and for vertically lifting the open upper edge of the envelope by a transverse air flow,
  • a hot air generator formed by a heating frame surrounding the envelope, and movable from top to bottom to ensure heat shrinkage of the film and of the upper edge on the load,
characterized in that the hot air generator cooperates with a deflector to successively send the transverse air flow, and the retraction air respectively to the internal wall, and the external wall of the upper edge of the envelope.

Le déflecteur est de préférence mobile verticalement en venant en appui sur la charge lors de la phase de rétraction, et possède une forme de tuyère à convergent-divergent. The deflector is preferably movable vertically by pressing on the load during the retraction phase, and has a nozzle shape at convergent-divergent.

Un ventilateur de reprise d'air chaud en provenance du générateur d'air chaud peut être agencé au-dessus de la charge, pour renvoyer l'air chaud contre la paroi interne du bord supérieur de l'enveloppe de manière à en augmenter la vitesse, et améliorer l'échange thermique de rétraction. Le ventilateur peut être remplacé par tout autre moyen d'aspiration de l'air chaud, notamment une tuyère du type Venturi.A hot air return fan from the hot air generator can be arranged above the load, to return the hot air against the inner wall of the upper edge of the envelope so as to increase the speed, and improve the heat exchange of shrinkage. The fan can be replaced by any other means of extracting hot air, in particular a Venturi type nozzle.

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 du dispositif d'emballage selon l'invention, montrant la première étape de redressement du bord supérieur de l'enveloppe au moyen de l'air chaud issu du générateur d'air chaud ;
  • la figure 2 représente une vue identique de la figure 1, au début de la course de descente du générateur d'air chaud engendrant la rétraction du bord supérieur du film sur la charge ;
  • la figure 3 montre le générateur d'air chaud en position de fin de course de descente après la rétraction totale du film sur la surface latérale de la charge;
  • les figures 4 et 5 sont des vues identiques de la figure 1 de deux variantes de réalisation.
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 of the packaging device according to the invention, showing the first step of straightening the upper edge of the envelope by means of hot air from the hot air generator;
  • FIG. 2 represents an identical view to FIG. 1, at the start of the descent stroke of the hot air generator, causing the upper edge of the film to retract on the load;
  • FIG. 3 shows the hot air generator in the end-of-travel position after the total shrinkage of the film on the lateral surface of the load;
  • Figures 4 and 5 are identical views of Figure 1 of two alternative embodiments.

Description d'un mode de réalisation préférentiel.Description of a preferred embodiment.

En référence aux figures 1 à 3, un dispositif d'emballage (10) d'une charge (CH) au moyen d'une enveloppe (11) de film souple en matière thermorétractable, comporte un générateur (12) d'air chaud constitué, à titre d'exemple, par un brûleur à gaz en forme de cadre (13) chauffant mobile destiné à entourer la charge (CH) revêtue de l'enveloppe (11). La charge (CH) est généralement posée sur une palette (non représentée) amenée dans le poste d'emballage par un convoyeur, et le cadre (13) chauffant est déplaçable de haut en bas pour assurer la thermorétraction du film sur la charge (CH).Referring to Figures 1 to 3, a packaging device (10) of a load (CH) by means of an envelope (11) of flexible film of heat-shrinkable material, comprises a hot air generator (12) constituted, for example, by a movable heating frame-shaped gas burner (13) for surrounding the load (CH) coated with the casing (11). The charge (CH) is generally placed on a pallet (not shown) brought into the packing station by a conveyor, and the heating frame (13) can be moved up and down to heat shrink the film on the load (CH).

Le film est en polyéthylène, mais toute autre matière plastique thermorétractable peut être utilisée.The film is made of polyethylene, but any other heat-shrinkable plastic material can be used.

L'enveloppe (11) est ouverte à ses deux extrémités inférieure et supérieure de manière à former un manchon, et est fabriquée par un procédé d'emballage à rideau du type décrit dans le document FR 2606 366, ou par tout autre procédé.The envelope (11) is open at its two lower and upper ends of so as to form a sleeve, and is made by a packaging process to curtain of the type described in document FR 2606 366, or by any other method.

Pour garantir une rétraction régulière et tendue du film sur le dessus de la charge (CH), le bord supérieur (14) ouvert de l'enveloppe (11) est d'abord relevé verticalement grâce à un écoulement d'air transversal en provenance du générateur (12) d'air chaud. A cet effet, un déflecteur (15) est solidarisé à un support (16) agencé dans la zone médiane au-dessus de la face supérieure de la charge (CH), de manière à dévier l'écoulement d'air chaud de 180° en le dirigeant vers la paroi interne du bord supérieur (14) au début de la phase de rétraction de l'enveloppe (11).To guarantee a regular and taut shrinkage of the film on top of the load (CH), the open upper edge (14) of the casing (11) is first raised vertically thanks to a transverse air flow coming from the hot air generator (12). To this end, a deflector (15) is secured to a support (16) arranged in the middle zone above the upper face of the load (CH), so as to deflect the flow of hot air by 180 ° by directing towards the inner wall of the upper edge (14) at the start of the shrinkage of the envelope (11).

Le support (16) du déflecteur (15) peut être fixe, mais de préférence mobile verticalement en venant en appui sur la charge (CH) lors de la rétraction.The support (16) of the deflector (15) can be fixed, but preferably mobile vertically by coming to bear on the load (CH) during retraction.

A titre d'exemple, le cadre (13) du générateur (12) d'air chaud est relié par un soufflet (18) à l'ossature de la hotte (17) solidaire du bâti de la machine, ledit soufflet étant déformable au cours du mouvement de descente du cadre (13).For example, the frame (13) of the hot air generator (12) is connected by a bellows (18) to the frame of the hood (17) integral with the machine frame, said bellows being deformable during the downward movement of the frame (13).

Le fonctionnement du dispositif d'emballage (10) selon les figures 1 à 3, est le suivant :

  • Sur la figure 1, l'écoulement d'air chaud issu du générateur (12) est dirigé vers le déflecteur (15) dans le sens de la flèche F1, de manière à être dévié de 180° et renvoyé de l'intérieur vers la paroi interne du bord (14). Ce dernier est redressé verticalement, et subit simultanément un préchauffage suite à l'apport de chaleur.
  • Sur la figure 2, le cadre (13) du générateur (12) d'air chaud commence son mouvement de descente en effectuant la rétraction du bord supérieur (14) de l'enveloppe (11 ) sur la face supérieure de la charge (CH). Lorsque le cadre (13) arrive sensiblement au niveau de la face supérieure de la charge (CH), le sens de propagation de l'air chaud s'inverse (flèche F2) en étant dévié vers le haut par le déflecteur (15) pour ne pas perturber l'application du film sur le dessus de la charge (CH) emballée.
  • La figure 3 montre la poursuite du mouvement de descente du cadre (13) pour la thermorétraction des faces latérales de l'enveloppe (11) sur la charge (CH).
The operation of the packaging device (10) according to FIGS. 1 to 3 is as follows:
  • In FIG. 1, the flow of hot air coming from the generator (12) is directed towards the deflector (15) in the direction of the arrow F1, so as to be deflected by 180 ° and returned from the interior to the inner wall of the edge (14). The latter is straightened vertically, and simultaneously undergoes preheating following the addition of heat.
  • In FIG. 2, the frame (13) of the hot air generator (12) begins its downward movement by retracting the upper edge (14) of the envelope (11) on the upper face of the load (CH ). When the frame (13) arrives substantially at the level of the upper face of the load (CH), the direction of propagation of the hot air is reversed (arrow F2) being deflected upward by the deflector (15) to do not disturb the application of the film on top of the packaged load (CH).
  • FIG. 3 shows the continuation of the downward movement of the frame (13) for the heat-shrinking of the lateral faces of the envelope (11) on the load (CH).

On remarque que l'écoulement d'air transversal de relèvement du bord (14) supérieur de l'enveloppe (11), et l'air chaud de rétraction proviennent du même générateur (12). Pendant la course de descente du cadre (13), l'air chaud est utilisé successivement de l'intérieur vers l'extérieur pour le relèvement du bord (14) supérieur, puis de l'extérieur vers l'intérieur pour la rétraction du film.Note that the transverse air flow for raising the edge (14) upper part of the casing (11), and the hot retraction air comes from the same generator (12). During the lowering stroke of the frame (13), the hot air is used successively from the inside to the outside for raising the edge (14) upper, then from outside to inside for shrinking the film.

Sur la figure 4, un ventilateur (19) est associé au déflecteur (15) pour accélérer la reprise de l'air chaud en provenance du générateur (12). La vitesse de l'écoulement d'air transversal vers la paroi interne du bord (14) est ainsi augmentée pour améliorer l'échange thermique de rétraction. In FIG. 4, a fan (19) is associated with the deflector (15) to accelerate the return of hot air from the generator (12). The speed of the transverse air flow towards the internal wall of the edge (14) is thus increased to improve the heat exchange of shrinkage.

Selon la variante de la figure 5, le ventilateur (19) de la figure 4 est remplacé par tout autre appareil pneumatique d'aspiration ou de soufflage, notamment une tuyère (20) du type Venturi.According to the variant of Figure 5, the fan (19) of Figure 4 is replaced by any other pneumatic suction or blowing device, in particular a nozzle (20) of the Venturi type.

Claims (14)

Procédé d'emballage d'une charge au moyen d'une enveloppe de film souple en matière thermorétractable, ayant un bord ouvert au niveau de la face supérieure de la charge, et consistant à : relever verticalement le bord ouvert de l'enveloppe en le faisant dépasser de la face supérieure de la charge au moyen d'un écoulement d'air transversal dirigé vers la surface interne du bord ouvert, chauffer le film par de l'air chaud sur toute la surface latérale extérieure de l'enveloppe pour assurer la thermorétraction du film sur la charge, caractérisé en ce que l'écoulement d'air transversal de relèvement du bord (14) de l'enveloppe (11), et l'air chaud de rétraction proviennent du même générateur d'air chaud (12).Method for packaging a load by means of a flexible film envelope made of heat-shrinkable material, having an open edge at the upper face of the load, and comprising: vertically raise the open edge of the envelope by making it protrude from the upper face of the load by means of a transverse air flow directed towards the internal surface of the open edge, heating the film with hot air over the entire outer lateral surface of the casing to heat shrink the film on the load, characterized in that the transverse air flow for raising the edge (14) of the envelope (11), and the hot retraction air come from the same hot air generator (12). Procédé d'emballage selon la revendication 1, caractérisé en ce que l'air chaud de rétraction est dirigé successivement de l'intérieur vers l'extérieur, puis de l'extérieur vers l'intérieur en déplaçant le générateur d'air chaud (12) de haut en bas.Packaging method according to claim 1, characterized in that the hot shrinking air is successively directed from the inside to the outside, then from the outside to the inside by moving the hot air generator (12 ) from top to bottom. Procédé d'emballage selon la revendication 1 ou 2, caractérisé en ce que le écoulement d'air transversal est chaud pour assurer un préchauffage de la paroi interne du bord supérieur (14) de l'enveloppe (11).Packaging method according to claim 1 or 2, characterized in that the transverse air flow is hot to ensure preheating of the internal wall of the upper edge (14) of the envelope (11). Procédé d'emballage selon l'une des revendications 1 à 3, caractérisé en ce que l'air de rétraction du bord supérieur (14) de l'enveloppe est orienté selon des sens opposés pour agir successivement sur la paroi interne, et sur la paroi externe dudit bord. Packaging method according to one of claims 1 to 3, characterized in that the retraction air from the upper edge (14) of the envelope is oriented in opposite directions to act successively on the internal wall, and on the outer wall of said edge. Procédé d'emballage selon la revendication 4, caractérisé en ce que la déviation de l'air de rétraction au début de la course de déplacement du générateur d'air chaud (12) est opérée par un déflecteur (15) se trouvant au voisinage de la zone médiane au-dessus de la charge (CH).Packaging method according to claim 4, characterized in that the deflection of the shrinking air at the start of the travel stroke of the hot air generator (12) is effected by a deflector (15) located in the vicinity of the middle zone above the load (CH). Procédé d'emballage selon l'une des revendications 1 à 5, caractérisé en ce que la vitesse de l'écoulement d'air transversal dirigé vers la paroi interne du bord (14) est augmentée au moyen d'un dispositif d'aspiration de l'air en provenance du générateur d'air chaud (12).Packaging method according to one of claims 1 to 5, characterized in that the speed of the transverse air flow directed towards the internal wall of the edge (14) is increased by means of a suction device of air from the hot air generator (12). Dispositif d'emballage pour la mise en oeuvre du procédé selon l'une des revendications 1 à 6, comportant : un dispositif pour entourer la charge au moyen d'un film thermorétractable, et pour relever verticalement le bord supérieur ouvert de l'enveloppe par un écoulement d'air transversal, un générateur d'air chaud formé par un cadre chauffant entourant l'enveloppe, et déplaçable de haut en bas pour assurer la thermorétraction du film et du bord supérieur sur la charge, caractérisé en ce que le générateur d'air chaud (12) coopère avec un déflecteur (15) pour envoyer successivement l'écoulement d'air transversal, et l'air de rétraction respectivement sur la paroi interne, et la paroi externe du bord supérieur (14) de l'enveloppe (11).Packaging device for implementing the method according to one of claims 1 to 6, comprising: a device for surrounding the load by means of a heat-shrinkable film, and for vertically lifting the open upper edge of the envelope by a transverse air flow, a hot air generator formed by a heating frame surrounding the envelope, and movable from top to bottom to ensure heat shrinkage of the film and of the upper edge on the load, characterized in that the hot air generator (12) cooperates with a deflector (15) to successively send the transverse air flow, and the retraction air respectively to the internal wall, and the external wall of the upper edge (14) of the envelope (11). Dispositif d'emballage selon la revendication 7, caractérisé en ce que le déflecteur (15) est fixe et localisé au-dessus de la charge (CH).Packaging device according to claim 7, characterized in that the deflector (15) is fixed and located above the load (CH). Dispositif d'emballage selon la revendication 7, caractérisé en ce que le déflecteur (15) est mobile verticalement en venant en appui sur la charge (CH) lors de la phase de rétraction. Packaging device according to claim 7, characterized in that the deflector (15) is movable vertically by coming to bear on the load (CH) during the retraction phase. Dispositif d'emballage selon la revendication 8 ou 9, caractérisé en ce que le déflecteur (15) possède une forme de tuyère à convergent-divergent.Packaging device according to claim 8 or 9, characterized in that the deflector (15) has the shape of a convergent-divergent nozzle. Dispositif d'emballage selon l'une des revendications 7 à 10, caractérisé en ce que des moyens de reprise d'air chaud en provenance du générateur d'air chaud (12) sont agencés au-dessus de la charge (CH), pour renvoyer l'air chaud contre la paroi interne du bord supérieur (14) de l'enveloppe (11) de manière à en augmenter la vitesse, et améliorer l'échange thermique de rétraction.Packaging device according to one of claims 7 to 10, characterized in that hot air return means from the hot air generator (12) are arranged above the load (CH), for return the hot air against the internal wall of the upper edge (14) of the envelope (11) so as to increase the speed, and improve the heat exchange of shrinkage. Dispositif d'emballage selon la revendication 11, caractérisé en ce que le générateur d'air chaud (12) est formé par un brûleur à gaz conformé selon un cadre (13) rectangulaire.Packaging device according to claim 11, characterized in that the hot air generator (12) is formed by a gas burner shaped according to a rectangular frame (13). Dispositif d'emballage selon la revendication 11, caractérisé en ce que les moyens (19) de reprise d'air chaud comportent un ventilateur (19) communiquant avec le déflecteur (15) à travers un orifice d'admission de l'air chaud.Packaging device according to claim 11, characterized in that the means (19) for the return of hot air comprises a fan (19) communicating with the deflector (15) through an orifice for the admission of hot air. Dispositif d'emballage selon la revendication 11, caractérisé en ce que les moyens (19) de reprise d'air chaud comportent un dispositif d'aspiration, notamment à tuyère (20) Venturi.Packaging device according to claim 11, characterized in that the means (19) for resuming hot air comprise a suction device, in particular with a Venturi nozzle (20).
EP20040354022 2003-06-06 2004-06-02 Method and apparatus for packaging a load with a flexible heatshrinkable foil. Expired - Fee Related EP1486420B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0306828A FR2855814B1 (en) 2003-06-06 2003-06-06 METHOD AND DEVICE FOR PACKAGING A LOAD BY A THERMORETRABLE SOFT FILM
FR0306828 2003-06-06

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EP1486420A1 true EP1486420A1 (en) 2004-12-15
EP1486420B1 EP1486420B1 (en) 2007-08-29

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EP20040354022 Expired - Fee Related EP1486420B1 (en) 2003-06-06 2004-06-02 Method and apparatus for packaging a load with a flexible heatshrinkable foil.

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ES (1) ES2293188T3 (en)
FR (1) FR2855814B1 (en)

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EP0933297A1 (en) 1998-01-28 1999-08-04 Kurt Lachenmeier A/S Method and apparatus for packaging a load
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Publication number Priority date Publication date Assignee Title
WO2007048558A1 (en) * 2005-10-24 2007-05-03 Msk-Verpackung-Systeme Gesellschaft Mit Beschränkter Haftung Method and device for shrinking a heat shrink film placed around a stack of items, in particular a palleted stack of items
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Also Published As

Publication number Publication date
EP1486420B1 (en) 2007-08-29
ES2293188T3 (en) 2008-03-16
FR2855814B1 (en) 2005-08-19
FR2855814A1 (en) 2004-12-10

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