EP0451053B1 - Metal box, especially for food stuffs - Google Patents

Metal box, especially for food stuffs Download PDF

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Publication number
EP0451053B1
EP0451053B1 EP19910400904 EP91400904A EP0451053B1 EP 0451053 B1 EP0451053 B1 EP 0451053B1 EP 19910400904 EP19910400904 EP 19910400904 EP 91400904 A EP91400904 A EP 91400904A EP 0451053 B1 EP0451053 B1 EP 0451053B1
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EP
European Patent Office
Prior art keywords
receptacle
container
cylindrical wall
box
wall portion
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
Application number
EP19910400904
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German (de)
French (fr)
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EP0451053A1 (en
Inventor
Pierre Gachot
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/54—Inspection openings or windows

Definitions

  • the present invention relates to a metal box in particular for packaging food, comprising a container for example of substantially cylindrical shape which has a bottom and a lid mounted in leaktight manner on the edge of the container opposite said bottom.
  • Known boxes of this type are made from a thin sheet of tin, for example covered with a corrosion-resistant coating such as tin. These boxes are completely closed, so that consumers cannot see the contents of the box.
  • packaging for food in the form of glass jars which, because of their transparency, make it possible to see their content.
  • packaging is relatively heavy, brittle and expensive.
  • GB-A-1 200 469 describes a metal box provided with a plastic window.
  • the plastic can easily be scratched and deteriorate in contact with food.
  • Patent NL-A-46,207 describes a box provided with a window, but the latter has in particular the disadvantages that it projects outside the container and is insufficiently protected against lateral impacts.
  • the object of the present invention is to propose a method for creating a metal box, in particular for packaging food, which allows the consumer to see the contents of this box and nevertheless ensures good protection of the window.
  • the invention therefore relates to a method for the manufacture of a metal can, in particular for the packaging of food, comprising a container which has a bottom and a lid mounted in leaktight manner on the edge of the container opposite said bottom.
  • this transparent plate offers consumers or anyone else can examine the contents of the box. Given that this transparent plate is mounted in a sealed manner in the bottom and / or the lid of the metal container, it does not compromise either the rigidity of the box, or the sealing of the latter.
  • this plate is a glass disc which resists scratches and whose transparency is not likely to be impaired by prolonged contact with food.
  • the metal box in particular for the packaging of food such as caviar, comprises a container 1 of substantially cylindrical shape which has a bottom 2 and a cover 3 mounted in leaktight manner on the edge 4 of the container opposite said bottom 2.
  • the cover 3 comprises an annular rib 5 projecting inwardly which snaps onto the rolled edge 4 of the container.
  • the cover 3 also includes a seal 6 which rests on the edge 4 of the container 1.
  • the bottom 2 of the container 1 has an opening 7 in which is mounted in a sealed manner a plate made of transparent material constituted in the example represented by a glass disc 8.
  • the glass disc 8 occupies more than half of the surface of the bottom 2 of the container 1.
  • FIGS. 1 and 2 It can also be seen in FIGS. 1 and 2 that the peripheral edge 8a of the glass disc 8 is engaged in an annular groove 9 of U-shaped section produced by folding the metal wall of the bottom 2 of the container 1.
  • a flexible sealing material 10 is included between the bottom of the U-shaped groove 9 and the edge 8a of the glass disc 8. In addition, this groove 9 projects inside the container 1.
  • the wing 9a of the U-shaped groove 9 adjacent to the bottom 2 of the container 1 is connected to the wall of said bottom by a fold 11 of this wall, the parts 2a and 9a of this wall adjacent to the fold 11 being applied against each other (see in particular Figure 2).
  • the glass disc 8 is separated from the outer surface 2b of the bottom 2 by a distance d corresponding substantially to twice the thickness of the wall of the bottom 2, which shelters the disc 8 the abrasion caused by contact between this disc 8 and a hard surface.
  • the glass disc 8 is not only perfectly fixed to the bottom 2 but also contributes to the rigidity of this background 2.
  • the sealing material 10 between the bottom of the groove 9 in a U and the peripheral edge of the disc 8 provides excellent sealing guaranteeing perfect preservation of the food contained in the box.
  • the glass disc 8 allows the consumer to see the contents of the box. So, if it contains caviar, he can appreciate the quality of it and buy the box with confidence.
  • FIG. 3 represents a continuous strip 12 of tinplate or aluminum sheet covered with a food-grade protective coating.
  • a container 13 is produced by stamping in the metal sheet 12.
  • a second step see FIG. 4
  • the external face of the bottom of the container 13 is stamped to make a bowl 14 in said bottom protruding towards the inside of the container.
  • a flexible sealing material 20 for example based on elastomer, is applied to the cylindrical wall part 19.
  • the sealing material 20 After the sealing material 20 has hardened, the following is placed (see FIG. 9) a glass disc 8 in the housing delimited by the cylindrical wall part 19 and the crimped fold 18.
  • an annular molding 21 is formed on the side wall of the container and its edge 22 is rolled up.
  • glass disc 8 could also be mounted in a sealed manner in the cover of the box, as defined in claim 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Packaging Frangible Articles (AREA)

Description

La présente invention concerne une boîte métallique notamment pour le conditionnement d'aliments, comprenant un récipient par exemple de forme sensiblement cylindrique qui comporte un fond et un couvercle monté de façon étanche sur le bord du récipient opposé audit fond.The present invention relates to a metal box in particular for packaging food, comprising a container for example of substantially cylindrical shape which has a bottom and a lid mounted in leaktight manner on the edge of the container opposite said bottom.

Les boîtes connues de ce type sont réalisées à partir d'une mince tôle par exemple en fer blanc recouvert d'un revêtement résistant à la corrosion tel que de l'étain. Ces boîtes sont totalement fermées, de sorte que les consommateurs ne peuvent pas voir le contenu de la boîte.Known boxes of this type are made from a thin sheet of tin, for example covered with a corrosion-resistant coating such as tin. These boxes are completely closed, so that consumers cannot see the contents of the box.

Or, étant donné que ces boîtes sont fermées de façon étanche, elles sont destinées à être ouvertes seulement en vue de la consommation immédiate de l'aliment qu'elles contiennent. Le consommateur ne peut donc ouvrir ces boîtes simplement pour voir la nature et la qualité de l'aliment qu'elles contiennent.However, since these boxes are sealed, they are intended to be opened only for the immediate consumption of the food they contain. The consumer cannot therefore open these boxes simply to see the nature and quality of the food they contain.

Des boîtes de ce type sont actuellement utilisées pour conditionner le caviar. Or, on sait qu'il existe plusieurs variétés de caviar que les connaisseurs savent distinguer par leur aspect. Ces différentes variétés sont vendues à des prix très différents.Boxes of this type are currently used to package caviar. However, we know that there are several varieties of caviar that connoisseurs know how to distinguish by their appearance. These different varieties are sold at very different prices.

Or les consommateurs ne peuvent actuellement pas examiner le contenu des boîtes de caviar avant de les acheter. Ils sont ainsi obligés de les acheter au prix demandé, sans pouvoir vérifier si le contenu de la boîte correspond à la qualité de l'aliment qu'elle contient.However, consumers cannot currently examine the contents of boxes of caviar before purchasing them. They are therefore obliged to buy them at the asking price, without being able to verify whether the contents of the box correspond to the quality of the food it contains.

On connaît d'autre part des emballages pour aliments, sous forme de pots en verre qui du fait de leur transparence permettent de voir leur contenu. Toutefois, de tels emballages sont relativement lourds, cassants et coûteux.On the other hand, packaging for food is known, in the form of glass jars which, because of their transparency, make it possible to see their content. However, such packaging is relatively heavy, brittle and expensive.

Le brevet GB-A-1 200 469 décrit une boîte métallique pourvue d'une fenêtre en plastique. Or généralement, le plastique peut facilement être rayé et s'altérer au contact des aliments.GB-A-1 200 469 describes a metal box provided with a plastic window. However generally, the plastic can easily be scratched and deteriorate in contact with food.

Le brevet NL-A-46 207 décrit une boîte munie d'une fenêtre mais celle-ci a notamment pour inconvénients qu'elle fait saillie à l'extérieur du récipient et est insuffisamment protégée contre les chocs latéraux.Patent NL-A-46,207 describes a box provided with a window, but the latter has in particular the disadvantages that it projects outside the container and is insufficiently protected against lateral impacts.

Le but de la présente invention est de proposer un procédé pour créer une boîte métallique, notamment pour le conditionnement d'aliments, qui permette au consommateur de voir le contenu de cette boîte et assure néanmoins une bonne protection de la fenêtre.The object of the present invention is to propose a method for creating a metal box, in particular for packaging food, which allows the consumer to see the contents of this box and nevertheless ensures good protection of the window.

L'invention vise donc un procédé pour la fabrication d'une boîte métallique, notamment pour le conditionnement d'aliments, comprenant un récipient qui comporte un fond et un couvercle monté de façon étanche sur le bord du récipient opposé audit fond.The invention therefore relates to a method for the manufacture of a metal can, in particular for the packaging of food, comprising a container which has a bottom and a lid mounted in leaktight manner on the edge of the container opposite said bottom.

Le procédé selon l'invention est caractérisé en ce qu'il comprend les étapes suivantes :

  • on réalise par emboutissage un récipient dans une tôle métallique,
  • on emboutit la face extérieure du fond ou du couvercle du récipient pour réaliser dans ledit fond ou ledit couvercle une cuvette faisant saillie vers l'intérieur du récipient,
  • on découpe le fond de ladite cuvette,
  • on réalise sur la partie annulaire qui entoure l'ouverture découpée, un pli serti annulaire faisant saillie vers l'axe du récipient, ce pli serti étant prolongé par une partie de paroi cylindrique s'étendant vers l'intérieur du récipient,
  • on applique une matière souple d'étanchéité sur ladite partie de paroi cylindrique,
  • on place un disque en verre dans le logement délimité par ladite partie de paroi cylindrique et le pli serti et
  • on rabat sur le disque en verre le bord de ladite paroi cylindrique.
The method according to the invention is characterized in that it comprises the following steps:
  • a container is made from a metal sheet by stamping,
  • the external surface of the bottom or of the lid of the container is stamped in order to produce in said bottom or said lid a bowl projecting towards the interior of the container,
  • the bottom of said bowl is cut out,
  • an annular crimped fold projecting towards the axis of the container is produced on the annular part which surrounds the cut opening, this crimped fold being extended by a cylindrical wall part extending towards the interior of the container,
  • a flexible sealing material is applied to said cylindrical wall part,
  • a glass disc is placed in the housing delimited by said cylindrical wall part and the crimped fold and
  • the edge of said cylindrical wall is folded over the glass disc.

Grâce à cette plaque en matière transparente, les consommateurs ou toutes autres personnes peuvent examiner le contenu de la boîte. Etant donné que cette plaque transparente est montée de façon étanche dans le fond et/ou le couvercle du récipient métallique, elle ne compromet ni la rigidité de la boîte, ni l'étanchéité de celle-ci.Thanks to this transparent plate, consumers or anyone else can examine the contents of the box. Given that this transparent plate is mounted in a sealed manner in the bottom and / or the lid of the metal container, it does not compromise either the rigidity of the box, or the sealing of the latter.

De préférence, cette plaque est un disque en verre qui résiste aux rayures et dont la transparence ne risque pas d'être altérée par un contact prolongé avec des aliments.Preferably, this plate is a glass disc which resists scratches and whose transparency is not likely to be impaired by prolonged contact with food.

D'autres particularités facultatives et avantages de l'invention apparaîtront encore dans la description ci-après.Other optional features and advantages of the invention will become apparent in the description below.

Aux dessins annexés donnés à titre d'exemples non limitatifs :

  • la figure 1 est une vue en élévation et en demi-coupe axiale d'une boîte métallique conforme à l'invention,
  • la figure 2 est une vue en coupe à échelle agrandie du détail A de la figure 1,
  • les figures 3 à 11 sont des vues schématiques qui illustrent les étapes successives d'un procédé de fabrication de la boîte conforme à l'invention.
In the appended drawings given by way of nonlimiting examples:
  • FIG. 1 is a view in elevation and in axial half-section of a metal box according to the invention,
  • FIG. 2 is a section view on an enlarged scale of the detail A of FIG. 1,
  • Figures 3 to 11 are schematic views which illustrate the successive steps of a method of manufacturing the box according to the invention.

Dans la réalisation des figures 1 et 2, la boîte métallique, notamment pour le conditionnement d'aliments tels que du caviar, comprend un récipient 1 de forme sensiblement cylindrique qui comporte un fond 2 et un couvercle 3 monté de façon étanche sur le bord 4 du récipient opposé audit fond 2.In the embodiment of FIGS. 1 and 2, the metal box, in particular for the packaging of food such as caviar, comprises a container 1 of substantially cylindrical shape which has a bottom 2 and a cover 3 mounted in leaktight manner on the edge 4 of the container opposite said bottom 2.

Le couvercle 3 comprend une nervure annulaire 5 en saillie vers l'intérieur qui s'encliquète sur le bord roulé 4 du récipient. Le couvercle 3 comporte également un joint 6 qui vient s'appuyer sur le bord 4 du récipient 1. Le fond 2 du récipient 1 présente une ouverture 7 dans laquelle est montée de façon étanche une plaque en matière transparente constituée dans l'exemple représenté par un disque en verre 8.The cover 3 comprises an annular rib 5 projecting inwardly which snaps onto the rolled edge 4 of the container. The cover 3 also includes a seal 6 which rests on the edge 4 of the container 1. The bottom 2 of the container 1 has an opening 7 in which is mounted in a sealed manner a plate made of transparent material constituted in the example represented by a glass disc 8.

Dans l'exemple représenté, le disque en verre 8 occupe plus de la moitié de la surface du fond 2 du récipient 1.In the example shown, the glass disc 8 occupies more than half of the surface of the bottom 2 of the container 1.

On voit également sur les figures 1 et 2 que le bord périphérique 8a du disque en verre 8 est engagé dans une gorge annulaire 9 de section en U réalisée par pliage de la paroi en métal du fond 2 du récipient 1.It can also be seen in FIGS. 1 and 2 that the peripheral edge 8a of the glass disc 8 is engaged in an annular groove 9 of U-shaped section produced by folding the metal wall of the bottom 2 of the container 1.

Par ailleurs, une matière souple d'étanchéité 10 est comprise entre le fond de la gorge en U 9 et le bord 8a du disque en verre 8. De plus, cette gorge 9 fait saillie à l'intérieur du récipient 1.Furthermore, a flexible sealing material 10 is included between the bottom of the U-shaped groove 9 and the edge 8a of the glass disc 8. In addition, this groove 9 projects inside the container 1.

D'autre part, l'aile 9a de la gorge en U 9 adjacente au fond 2 du récipient 1 est raccordée à la paroi dudit fond par un pli 11 de cette paroi, les parties 2a et 9a de cette paroi adjacentes au pli 11 étant appliquées l'une contre l'autre (voir en particulier la figure 2).On the other hand, the wing 9a of the U-shaped groove 9 adjacent to the bottom 2 of the container 1 is connected to the wall of said bottom by a fold 11 of this wall, the parts 2a and 9a of this wall adjacent to the fold 11 being applied against each other (see in particular Figure 2).

Ainsi, le disque en verre 8 est séparé de la surface extérieure 2b du fond 2 par une distance d correspondant sensiblement à deux fois l'épaisseur de la paroi du fond 2, ce qui met le disque 8 à l'abri des chocs ou de l'abrasion provoquée par contact entre ce disque 8 et une surface dure.Thus, the glass disc 8 is separated from the outer surface 2b of the bottom 2 by a distance d corresponding substantially to twice the thickness of the wall of the bottom 2, which shelters the disc 8 the abrasion caused by contact between this disc 8 and a hard surface.

De plus, grâce à l'encastrement du disque de verre 8 dans une gorge en U réalisée par pliage de la paroi du fond 2 du récipient, le disque en verre 8 est non seulement parfaitement fixé au fond 2 mais de plus contribue à la rigidité de ce fond 2.In addition, thanks to the embedding of the glass disc 8 in a U-shaped groove produced by folding the bottom wall 2 of the container, the glass disc 8 is not only perfectly fixed to the bottom 2 but also contributes to the rigidity of this background 2.

La matière d'étanchéité 10 comprise entre le fond de la gorge 9 en U et le bord périphérique du disque 8 assure une excellente étanchéité garantissant une parfaite conservation des aliments contenus dans la boîte.The sealing material 10 between the bottom of the groove 9 in a U and the peripheral edge of the disc 8 provides excellent sealing guaranteeing perfect preservation of the food contained in the box.

Par ailleurs, le disque en verre 8 permet au consommateur de voir le contenu de la boîte. Ainsi, si celle-ci contient du caviar, il pourra apprécier la qualité de celle-ci et acheter la boîte en toute confiance.Furthermore, the glass disc 8 allows the consumer to see the contents of the box. So, if it contains caviar, he can appreciate the quality of it and buy the box with confidence.

Dans la description qui suit, on a décrit à titre d'exemple non limitatif les étapes successives du procédé de fabrication d'une boîte conforme à l'invention.In the description which follows, the successive stages of the process for manufacturing a box according to the invention have been described by way of non-limiting example.

La figure 3 représente une bande continue 12 de tôle en fer blanc ou en aluminium recouverte par un revêtement de protection de qualité alimentaire.FIG. 3 represents a continuous strip 12 of tinplate or aluminum sheet covered with a food-grade protective coating.

Dans une première étape du procédé de fabrication, on réalise par emboutissage un récipient 13 dans la tôle métallique 12. Dans une deuxième étape (voir figure 4), on emboutit la face extérieure du fond du récipient 13 pour réaliser dans ledit fond une cuvette 14 faisant saillie vers l'intérieur du récipient.In a first step of the manufacturing process, a container 13 is produced by stamping in the metal sheet 12. In a second step (see FIG. 4), the external face of the bottom of the container 13 is stamped to make a bowl 14 in said bottom protruding towards the inside of the container.

On découpe ensuite le fond 15 de ladite cuvette 14. Après une opération de détourage de l'ouverture 16 découpée (voir figure 5) et l'étape représentée sur la figure 6, on réalise (voir figure 7) sur la partie annulaire 17 qui entoure l'ouverture découpée 16, un pli serti annulaire 18 faisant saillie vers l'axe X-X′ du récipient 13. Le pli serti 18 ainsi formé est prolongé vers le bas par une partie de paroi cylindrique 19 s'étendant vers l'intérieur du récipient 13, parallèlement à l'axe X-X′ de celui-ci.Then cutting the bottom 15 of said bowl 14. After a trimming operation of the cut opening 16 (see Figure 5) and the step shown in Figure 6, we realize (see Figure 7) on the annular part 17 which surrounds the cut opening 16, an annular crimped fold 18 projecting towards the axis XX ′ of the container 13. The crimped fold 18 thus formed is extended downwards by a part of cylindrical wall 19 extending towards the inside of the container 13, parallel to the axis XX ′ thereof.

Dans une étape ultérieure (voir figure 8), on applique une matière souple d'étanchéité 20, par exemple à base d'élastomère, sur la partie de paroi cylindrique 19. Après durcissement de la matière d'étanchéité 20, on place (voir figure 9) un disque en verre 8 dans le logement délimité par la partie de paroi cylindrique 19 et le pli serti 18.In a subsequent step (see FIG. 8), a flexible sealing material 20, for example based on elastomer, is applied to the cylindrical wall part 19. After the sealing material 20 has hardened, the following is placed (see FIG. 9) a glass disc 8 in the housing delimited by the cylindrical wall part 19 and the crimped fold 18.

Dans une étape ultérieure, on rabat (voir figure 10) sur le disque en verre 8 le bord dépassant 19a de la paroi cylindrique 19, de façon à former une gorge annulaire de section en U enveloppant le bord périphérique du disque en verre 8.In a subsequent step, the overhanging edge 19a of the cylindrical wall 19, so as to form an annular groove of U-shaped section enveloping the peripheral edge of the glass disc 8.

Dans une dernière étape (voir figure 11), on forme une moulure annulaire 21 sur la paroi latérale du récipient et on roule son bord 22.In a final step (see FIG. 11), an annular molding 21 is formed on the side wall of the container and its edge 22 is rolled up.

Bien entendu, l'invention n'est pas limitée à l'exemple de réalisation que l'on vient de décrire et on peut apporter à celui-ci de nombreuses modifications sans sortir du cadre des revendications.Of course, the invention is not limited to the embodiment which has just been described and many modifications can be made to it without departing from the scope of the claims.

Ainsi le disque en verre 8 pourrait également être monté de façon étanche dans le couvercle de la boîte, comme défini dans la revendication 1.Thus the glass disc 8 could also be mounted in a sealed manner in the cover of the box, as defined in claim 1.

Claims (2)

  1. Method for producing a metallic box, especially for the packaging of food, including a receptacle (13) which comprises a bottom and a cover mounted sealed on the end of the receptacle opposite said bottom, wherein it includes the following stages :
    - a receptacle (13) is embodied via a drawing operation in a sheet metal (12),
    - the outer face of the bottom or cover of the receptacle (13) is drawn so as to embody a bowl in said bottom or said cover, said bowl projecting towards the inside of the receptacle,
    - the bottom (15) of said bowl (14) is cut,
    - embodied on the annular portion (17) surrounding the cut opening (16) is an annular crimped fold (18) projecting towards the axis (X-X′) of the receptacle (13), this crimped fold (18) being extended by one cylindrical wall portion (19) extending towards the inside of the receptacle,
    - a flexible sealing material (20) is applied to said cylindrical wall portion (19),
    - a glass disk (8) is placed in the housing delimited by said cylindrical wall portion (19) and the crimped fold (18), and
    - the edge of said cylindrical wall portion (19) is folded down on the glass disk (8).
  2. Box embodied according to a method conforming to claim 1, wherein the glass disk (8) occupies more than half the surface of the bottom.
EP19910400904 1990-04-04 1991-04-03 Metal box, especially for food stuffs Expired - Lifetime EP0451053B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9004305A FR2660624B1 (en) 1990-04-04 1990-04-04 METAL BOX, ESPECIALLY FOR THE PACKAGING OF FOOD.
FR9004305 1990-04-04

Publications (2)

Publication Number Publication Date
EP0451053A1 EP0451053A1 (en) 1991-10-09
EP0451053B1 true EP0451053B1 (en) 1994-06-22

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EP19910400904 Expired - Lifetime EP0451053B1 (en) 1990-04-04 1991-04-03 Metal box, especially for food stuffs

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EP (1) EP0451053B1 (en)
DE (1) DE69102570D1 (en)
FR (1) FR2660624B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2759676B1 (en) * 1997-02-14 1999-05-14 Sofrigam INSULATED PACKAGING

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE699190A (en) * 1967-05-30 1967-11-03

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FR2660624A1 (en) 1991-10-11
FR2660624B1 (en) 1994-06-17
DE69102570D1 (en) 1994-07-28
EP0451053A1 (en) 1991-10-09

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