EP0731738B1 - Boites embouties/etirees de structure metalloplastique et leur procede de fabrication - Google Patents

Boites embouties/etirees de structure metalloplastique et leur procede de fabrication Download PDF

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EP0731738B1
EP0731738B1 EP95904223A EP95904223A EP0731738B1 EP 0731738 B1 EP0731738 B1 EP 0731738B1 EP 95904223 A EP95904223 A EP 95904223A EP 95904223 A EP95904223 A EP 95904223A EP 0731738 B1 EP0731738 B1 EP 0731738B1
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Prior art keywords
metal
thickness
plastic
layer
layers
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EP95904223A
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German (de)
English (en)
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EP0731738A1 (fr
EP0731738A4 (fr
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Robert J. Mchenry
Dominique Petit
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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
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/38—Details of the container body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing
    • 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
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B65D1/28—Thin-walled containers, e.g. formed by deep-drawing operations formed of laminated material

Definitions

  • the present invention generally relates to fabrication, by drawing and ironing, of cans for use in packaging of beverages or foods and containers for aerosols. More precisely, the present invention relates to new and improved metal-plastic laminate construction of the type including metal-polymer-metal, that is in which a layer of polymer is interposed between two metal sheets to which it is adhered.
  • metal-plastic-metal metal-polymer-metal, or more simply the abbreviation MPM are used without particular distinction to identify the new and improved laminar materials of the present invention.
  • WO 82/00020 published on January 7, 1982, describes a metal-plastic construction which in its simplest form includes a polyethylene (PE) film attached to a foil or plate of metal. Another embodiment includes two films of PE attached to opposite surfaces of a metal plate to form a complex, PE-metal-PE. Finally, a third embodiment consists of two plates or foils of metals attached to opposite surfaces of a PE film.
  • the PE used obtained by copolymerization under a low pressure of ethylene and of butene-1, is of a linear low density type (LLDPE) having a density of between 0.91 and 0.94.
  • LLDPE linear low density type
  • the LLDPE described in this application has the interesting property of adhering directly to the metal without needing to use an adhesive. It suffices to adhere it to the metal by the simultaneous application of heat and pressure (heat sealing).
  • the metallic substrates described in this application include: steel, steel having a coating of tin or of chrome or of chrome/oxide or of zinc, aluminum treated or not with nickel, copper, or zinc. It may have undergone a chemical conversion treatment.
  • the French patent No. FR2 665 887 (Pechiney Emballage Alimentaire) describes a capsule to fit over a cork made by drawing, drawing and ironing, or flow turning, characterized in that it is comprised of two layers of aluminum bound together by an adhesive layer of Shore hardness less than 80.
  • the adhesive layer can be constituted of an ethylene acrylic acid or of polyethylene, or of polypropylene modified with acid functionality.
  • the total thickness of the complex is comprised between 120 and 400 ⁇ m (microns) with the following percentage distribution of the total thickness: Outer layer of aluminum 20 to 50% Adhesive layer 3 to 30% Inner layer of aluminum 40 to 60%
  • EP-A-0 046 444 assigned to Schwerzerische Aluminum AG describes an MPM composite laminate foil in which the plastic layer could be as thick as the two metal layers combined.
  • One stated requirement for achieving deep drawability is to select the plastic core layer and the metal surface layers such that when the composite is elongated, the load borne by the plastic core is greater than that borne by each of the metal strips. This condition is achieved by use of an oriented or stretched plastic layer. It is also stated that the soft or half-hard aluminum thin strip is particularly well suited. There is no teaching of drawing and ironing as a suitable process, but rather deep drawing and deep drawing by elongation, which are the conventional processes for such semi-rigid containers.
  • a metal-plastic-metal structural laminate which can be formed into various useful articles is described in European Application EP-A-0134958 assigned to Dow Chemical Company.
  • This invention is in part defined by a very wide range of thicknesses of the individual layers, of total thicknesses, and of ratio of thicknesses. It is further defined in terms of an ability of the laminate to withstand at least a certain level of stretch formability as measured in a standard laboratory test, the ability to be bent to a given sharp radius without metal rupture, and a certain level of thermal stability.
  • the patent does not contain any reference to any drawn or drawn and ironed shapes nor to the ability of these laminate constructions to be formed by either a drawing process or by a drawing and ironing process.
  • the laboratory test described is a form of biaxial tension test in which the material is uniformly stretched while maintaining the periphery, fixed in such a way as to thin the material. While such a stretch forming process is conventionally used in forming shallow parts such as automotive panels, it is not used for making food or beverage cans.
  • a conventional drawing process such as is used to make food cans or for the initial steps to make beverage cans allows the material to flow from the periphery and results in little or no thickness reduction.
  • U.S. Patent 3298559 assigned to Continental Can Company, describes laminated metal-plastic containers, such as cake pans, which are cold drawn in conventional forming dies.
  • metal-plastic containers described are some which are of the MPM type.
  • MPM the metal-plastic type.
  • Those examples which cover MPM constructions have a ratio of plastic to total metal thickness of between 5 and 9.
  • the metal layers in the MPM examples are described as dead-soft or zero temper. There is no indication that such containers can be formed by a drawing and ironing process or that drawn containers suitable for food cans can be made.
  • This process is comprised as its name indicates by a first series of one or several passes of drawing and second series of one or several passes of ironing.
  • This disc is first drawn for forming an initial shallow cup with the aid of an apparatus represented by Figure la.
  • the initially flat disc (1) is shown there in the course of deformation. It is pressed between a fixed die plate (2) and a pressure plate (3).
  • the descent of the punch (4) driven by a piston permits the formation of the cup which undergoes practically no decrease in thickness.
  • the cup is then formed by a second drawing pass ( Figure 1b) where the designating numerals correspond to the same elements as on Figure 1a.
  • the walls of this cup are then ironed by the aid of a series of ironing rings, generally three in number, of decreasing internal diameter.
  • Figure 2 represents one of these ironing rings and illustrates its functioning.
  • the cup (5) is fit with a slight play on the punch (6) which causes it to penetrate the interior of the ring (7) of which the interior diameter is inferior to the exterior diameter of the cup. This results in a thinning and a corresponding elongation of the wall.
  • the magnitude of the elongation or ironing is regulated by the difference between the exterior diameter of the cup and the interior diameter of the ring.
  • the capacity for deformation of the cup not permitting reaching the final height of the can in a single ironing pass it is usual as indicated above to place three rings in series passed successively by the cup with the same punch stroke.
  • the laminates may be made with sheet metal or foil bonded to opposed surfaces of the polyethylene film, there is no indication that thicker plastic layers would be desired or possible in such MPM structures. If one constructed MPM structures using the 100 ⁇ m (micron) plastic film and two metal foils of 210 ⁇ m (microns) which are described in that patent, the ratio of plastic core thickness to total metal thickness would be less than 0.24. This low ratio, as will be shown, is below that required for the desired cost savings.
  • the second approach is to work with metal-plastic constructions in which the respective materials are selected in such a way that the plastic core dominates the forming and the aluminum deformation follows the deformation of the plastic.
  • this condition is specified in terms of the load borne by the plastic core being greater than that borne by each of the metal strips. This is achieved by use of soft or half-hard aluminum strip and the use of an oriented or stretched plastic layer.
  • an unoriented plastic core layer is preferred over an oriented plastic core in terms of the ability to withstand the deeper draws and, in particular, to withstand the subsequent ironing steps required for drawn and ironed beverage and food cans.
  • the inventors have found that the plastic layer ought to be placed between two metal layers and ought to be thicker than those attained up until now in the containers made of metal-plastic constructions. It is known in other types of mechanical structures to use a low cost or low density material as a central layer placed between two outside layers made from a stronger and more rigid material. Such "sandwich structures are known for achieving a bending resistance approaching that of a single layer of the more solid material of the same thickness as the total thickness of the sandwich.
  • the pressure at which the base of a rigid container such as a gaseous beverage can start to pass from a concave shape, viewed from the exterior, to a convex shape depends on a complex function of the bending resistance and the membrane strength. This pressure is commonly called bottom buckling pressure.
  • the form of this function of the two types of resistance depends on the exact shape of the concave dome and of the shape of the part of the base which connects the dome to the bottom of the container's wall.
  • the exponent n lies between 1.2 and 1.9. The closer the exponent is to 2, the less thickness of plastic is required for a given thickness of the external metal layers.
  • Figure 3 shows the plastic thickness e p required for a total thickness of the two metal layers e n to obtain the same buckling pressure as with an entirely metallic structure with a thickness of 330 ⁇ m (microns).
  • each metal foil had a thickness of 100 microns and was aluminum alloy 3003 with a tensile rupture strength of 239 MP a
  • the inventors calculated the portion of the total load which was borne by the metal foil. The percentages varied from 99% with a 55 ⁇ m (micron) thick core to 82% with a 420 ⁇ m (micron) thick core.
  • the present invention provides new and improved metal-polymer-metal laminates and constructions useful for forming can bodies and cans.
  • the nature and the thicknesses of the layers of the laminate are specially adapted to provide the mechanical characteristics demanded of the metal cans intended, in particular, for the packaging of gaseous beverages or food, as well as, to their means of forming by drawing and ironing.
  • the present invention has equally as objective a process for the fabrication of metal cans intended for the packaging of food products or of beverages by drawing and ironing of metal-plastic constructions of the type MPM.
  • Can bodies composed of a base and of a wall in which the generatrice are perpendicular to the base of a metal-plastic construction of the type metal-polymer-metal intended to contain in particular beverages and objects of the invention are characterized in that the metal-plastic construction comprises a central layer of thermoplastic polymer of thickness P coated on its interior and exterior faces with metal foils of respective thicknesses M i and M e such that the ratio P/(M i + M e ) is superior to 0.5 and that the bodies being fabricated by drawing and ironing, their wall is thinned with respect to the bottom of the can body.
  • this ratio P/(M i + M e ) will be preferably between 0.7 and 2.5 and most preferably between 1 and 2.
  • the central polymer layer has a thickness before ironing between 100 and 500 ⁇ m (microns), each of the metal foils a thickness between 25 and 150 ⁇ m (microns) before ironing. These thicknesses are evidently less in the thinned walls of the body.
  • this plastic layer is essentially nonoriented other than incidental orientation normally produced during the casting or blowing of a plastic film.
  • the polymer constituting the central layer is chosen among one of the following thermoplastics: polypropylene, high and low density polyethylenes, polyesters and polyamides. It is interesting to note that, the polymer not being in contact with the food product or the beverage contained within the container, it is possible and recommended to use recycled polymers. Trials have been made with recycled polyesters and polypropylene and give completely satisfactory results.
  • the metal is either steel, tin plated or not, coated with chrome, zinc, nickel, or of chrome-chrome oxide, or of aluminum or an alloy of aluminum, aluminum alloys being preferred. It is further preferred that the rupture strength of the metal foil when tested alone and in tension be greater than 185 MP a .
  • the selection of the specific materials and the thicknesses of the layers is preferably such that, when the starting sheet is pulled in uniaxial tension, most of the load is borne by the combined metal layers. More preferably, the percentage of the load which is borne by the combined metal layers should be greater than or equal to 70%.
  • the metal foils can be of different thicknesses or constituted of different metals.
  • a layer of appropriate adhesive of a thickness between 1 and 20 ⁇ m (microns) can be interposed between the central layer of polymer and the foil or foils of metal, the thickness of the adhesive being included in the total thickness of polymer P.
  • the adhesive interposed between polymer and metal is either a thermoset polymer, for example a polyurethane or an epoxy, or a thermoplastic polymer such as polyolefins modified in a classical fashion by an ethylenic acid (malic, crotonic, etc.) ethylene acrylics (EAA), polyesters or copolymers of the monomers corresponding to the above indicated polymers.
  • a thermoset polymer for example a polyurethane or an epoxy
  • a thermoplastic polymer such as polyolefins modified in a classical fashion by an ethylenic acid (malic, crotonic, etc.) ethylene acrylics (EAA), polyesters or copolymers of the monomers corresponding to the above indicated polymers.
  • the adherence of the metallic foils to the central polymer layer is evidently an important characteristic of the metal-plastic constructions and of the can bodies produced from these constructions. This adherence is measured by the peel strength, the force necessary for detaching a band of metal foil of determined width from its polymer support and which is expressed, therefore, in force per unit length.
  • the constructions intended for the production of drawn and ironed can bodies ought to have a peel strength higher than 0.4 newtons per millimeter.
  • the metal-plastic constructions can themselves be coated on one or both sides with a varnish or a polymer film without parting from the framework of the present invention.
  • Another object of the invention concerns the finished cans prepared starting from the bodies or forms of which the characteristics are indicated above.
  • To fabricate a can starting from a can body one first proceeds to trim the body to height by shearing the upper part of the walls, then to neck this upper part. The upper edge ought to be then rolled to a small radius of curvature to permit the seaming of the end after filling the can. Because, in the course of this operation of bending the metal-plastic construction according to this small radius, one observes that the metal foil the farther from the center of curvature, that which is in extension, breaks at the point where the radius is the smallest, the other metal foil remaining intact.
  • the internal _stresses in the axial direction of a pressurized cylinder are approximately half of those in the direction perpendicular to the axis.
  • the total thickness in the brim is, in general, higher than that of the thinnest part of the wall, which gives a margin of safety. It is also possible for reinforcing the can to choose for the external foil a higher thickness or a stronger alloy than for the internal layer.
  • a final can of metal-plastic metal-polymer-metal, possessing an upper rolled border in which the metal foil the greater distance from the center of curvature, which is therefore in extension, is ruptured at the location where the radius is the smallest constitutes a second object of the invention.
  • the invention concerns equally a process for fabricating drawn and ironed cans intended for the packaging of beverages characterized in that it includes the following steps:
  • step a of the invention The metal-plastic construction objects of step a of the invention are prepared by different known methods. The most commonly used are direct co-extrusion, thermal sealing, and induction gluing. These last two methods are preferably practiced on a continuous line fed with plastic films and metal strips.
  • Direct co-extrusion consists of extruding between the two metal foils which are unrolled continuously and which constitute the external layers, the central polymer layer on one side and the others of this central layer the two thin layers of adhesive.
  • the composite product thus obtained passes then between the rollers in order to achieve the adherence between the different layers. This technique evidently applies just in the case of thermoplastic adhesives.
  • Heat bonding consists in starting with a composite strip of polymers including a central layer of polymer coated on each of its faces by the adhesive layer, here also thermoplastic, and of introducing this strip between two metal foils.
  • the heat bonding is assured by the passage of the composite product thus obtained between two rolls heated to a temperature sufficient to melt or at least soften the adhesive layer sufficiently in a fashion to guarantee the adhesion between the polymer core and the metal foils.
  • the gluing by induction consists of coating the inside faces of the two metal foils with a thermosetting adhesive by a known method and applying these foils from one side and the other on the strip of central polymer with the aid of rollers.
  • the forming of the cans includes a first step c consisting in general of one or several successive drawing passes in using a device such as that represented in Figure 1.
  • a device such as that represented in Figure 1.
  • the inventors have been led to prefer one particular shape of punch base and of entry shape of the die plate which work together to assure a drawing of the construction without forming cracks, wrinkles or delaminations.
  • the punch of a general shape of a cylinder of revolution, presents, according to one of the preferred methods of the invention, an axial section of which the generatrice are connected at the base of the punch by a circular arc of a radius between 5 and 10 mm. This connection can be done directly on the base of the punch or by an intermediary, seen in section of a second circular arc of which the center lies on the axis of revolution of the punch.
  • Figures 5a and 5b illustrate the two variations indicated above.
  • Figure 5a represents the simplest shape of the embodiment.
  • the punch 9 is viewed in section through the axis; it takes the shape of a cylinder of revolution about the axis 10.
  • the generatrix 11 is connected to the base by a circular arc of radius R1 which falls between 5 and 10 mm (8 mm for example for punch with a diameter of 85 mm). This circular arc generates by revolution a portion of a torus.
  • Figure 5b represents a developed shape a little more complicated; the generatrice are joined on the base by a first circular arc 14 of radius R1 between 5 and 10 mm which connects tangentially to a second circular arc of large radius R2 (15) centered on the axis of the punch.
  • the circular arc (15) generates a spherical dome and the circular arc (14) a portion of a torus.
  • R1 could be in the order of 6 mm and R2 in the order of 250 mm.
  • drawing die plates have the shape represented schematically in Figure la which represents the first drawing pass starting from a flat circular disc as has been explained above.
  • Figure 6 represents the following drawing passes according to the invention of which the starting material is no longer a disc but a shape already drawn during the course of the first pass.
  • the cup (24) is in the process of drawing, its initial diameter corresponding to the upper part (25) is in the process of reduction towards its final diameter (26) defined by the space between the punch (27) and the die plate (28).
  • the height of the walls grows without that there be an ironing in the normal sense of the word, that is a significant reduction of the thickness.
  • An inside pressure plate (29) is positioned at the interior of the starting cup.
  • the inventors have found that the angle at which the generatrix of the entry cone makes with the horizontal plane perpendicular to the axis of the punch is critical for drawing metal-plastic constructions of type MPM. This angle ought to be between 10 degrees and 70 degrees and preferably around 60 degrees.
  • the forming of cans includes a last step (d), consisting of an ironing operation permitting the elongation of the wall with a corresponding thinning of the wall. This operation is represented schematically in Figure 2.
  • the applicant has discovered that it was possible to iron the walls of a cup drawn from an MPM disc without engendering flaws such as cracks and delaminations, preferably by processing in four successive ironing passes instead of the three generally practiced in particular according to the teaching in European Patent Application EP 0402006. More preferred still, the first of these successive passes is a simple calibrating pass with a rate of thickness reduction between 2 and 25%.
  • a strip of polypropylene of 300 ⁇ m (microns) thickness has been coated on each of its faces with a layer of 10 ⁇ m (microns) in thickness of an adhesive consisting of a film of maleic acid modified polypropylene.
  • the two films of adhesive have been applied on the film cold by passing between two rolls.
  • the composite strip thus obtained has been then introduced continuously between two foils of 100 ⁇ m (micron) thick aluminum alloy 3003, a manganese alloy according to the standards of the "Aluminum Association", each unwound from a bobbin and preheated by passage through an oven at a temperature of 200°C in a fashion to melt the adhesive.
  • the MPM construction obtained was then passed between the rollers exerting a pressure of around 4000 kPa, then rolled onto a bobbin.
  • a die plate for which the angle alpha was 60° has been used.
  • the first pass has given cups with an outside diameter of 86 mm and a height of 35 mm.
  • the second pass has given cups with an outside diameter of 67 mm and a height of 56 mm.
  • a composite MPM strip has been prepared by coextruding between two foils of the same 3003 alloy as in Example 1, but of a thickness of 80 ⁇ m (microns), a core comprised of polypropylene in 250 ⁇ m (microns) of thickness and on one side and the others of this core a layer of adhesive comprised of maleic acid modified polypropylene of 10 ⁇ m (microns) in thickness.
  • the adhesion has been achieved by passage between two rolls heated to 200°C, while applying a pressure of 4000 kPa.
  • Some beverage bottle cups have been fabricated under the same conditions as in Example 1. The examination of these cups has shown no cracking of the metal or of the plastic. No delamination between the metal and the plastic has been observed.
  • An MPM composite strip has been prepared by coextrusion under the same conditions and with the same component as those in Example 2, but in using for the core polypropylene recycled from cans fabricated with this same MPM construction. Even though the recovery of the polypropylene from the used cans did not permit the separation of the adhesive from the polymer, the constructions obtained were of excellent quality and did not show either cracks or delamination. Beverage can cups have been produced under the same conditions as for Example 1. The examination of these cups has not exhibited any cracks of the metal or of the plastic. No delamination between the metal and the plastic has been observed.
  • a MPM construction has been fabricated comprising successively: a foil of 3003 alloy of 80 ⁇ m (microns) in thickness, a layer of adhesive of amorphous polyethylene terephtalate of 10 ⁇ m (microns) in thickness, a layer of polyethylene terephtalate of 200 ⁇ m (microns) in thickness, another layer of amorphous polyethylene terephtalate of 10 ⁇ m (microns) of thickness, finally another foil of 3003 alloy of 80 ⁇ m (microns) in thickness.
  • the beverage can cups have been fabricated under the same conditions as in Example 1. The examination of these cups has not shown any cracks of the metal or of the plastic. No delamination between the metal and the plastic has been observed.
  • Example 5 concerns the same fabrication of cups as in Example 4, with the comparative difference that the polyethylene terephtalate used came from the recovery of used plastic bottles. These bottles, after washing and drying, have been ground and have been introduced in the feed hopper of the extruder. No quality problem has been observed either on the construction or on the cups obtained by drawing and ironing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Claims (11)

  1. Corps de boíte embouti et étiré comprenant une base et une paroi latérale dressée, la base et la paroi latérale présentant une construction laminaire de type Mi-P-Mc, dans laquelle Mi et Mc sont des couches de feuilles métalliques intérieure et extérieure, respectivement et P est une couche centrale de polymère et le rapport des épaisseurs P/(Mi et Mc) est supérieur à 0,5, et l'épaisseur de la paroi latérale étant plus mince que l'épaisseur de la base.
  2. Corps de boíte selon la revendication 1, caractérisé en ce que la couche centrale de polymère est essentiellement non orientée.
  3. Corps de boíte selon la revendication 1 ou 2, caractérisé en ce que l'épaisseur de la couche de polymère P est entre 100 et 500 µm et l'épaisseur de chacune des couches métalliques Mi et Mc est entre 25 et 150 µm.
  4. Corps de boíte selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la résistance à l'écaillage des couches métalliques sur les couches en matière plastique dans la construction laminaire est supérieure à 0,4 N/mm.
  5. Corps de boíte selon l'une quelconque des revendications 1 à 4, dans lequel Mi et Mc sont des feuilles métalliques choisies indépendamment à partir de feuilles d'acier, d'acier étamé, d'acier revêtu de chrome, de zinc ou de nickel, de l'aluminium revêtu de chrome-oxyde de chrome et des alliages d'aluminium.
  6. Corps de boíte selon l'une quelconques des revendications 1 à 5, dans lequel la couche de polymère P comprend un polymère thermoplastique choisi à partir du groupe constitué du polypropylène, du polyéthylène à haute densité, du polyéthylène à basse densité, des polyesters, et du nylon.
  7. Corps de boíte selon l'une quelconque des revendications 1 à 6, comprenant en outre une couche d'adhésif présentant une épaisseur entre 1 et 20 micromètres intercalée entre la couche de polymère centrale P et chacune des couches de feuilles Mi et Mc, l'épaisseur de l'adhésif étant incluse dans l'épaisseur totale du polymère P.
  8. Corps de boíte selon l'une quelconque des revendications 1 à 7, dans lequel les parties de paroi latérales comprennent une région laminée supérieure dans laquelle la feuille métallique Mi est en extension et est rompue à l'emplacement où le rayon de courbure est le plus petit.
  9. Corps de boíte selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la feuille métallique Mc formant une surface extérieure du corps de boíte est plus épaisse que la couche de feuille Mi formant la surface intérieure du corps de boíte.
  10. Procédé destiné à réaliser des corps de boíte présentant une teneur en métal réduite, ledit procédé comprenant :
    la fourniture d'une feuille stratifiée Mi-P-Mc, dans laquelle Mi et Mc sont des couches de feuilles métalliques intérieure et extérieure, respectivement et P est une couche de polymère centrale et le rapport des épaisseurs P/(Mi+Mc) est supérieur à 0,5,
    découper des disques (1) à partir de la feuille,
    emboutir les disques dans au moins une passe d'emboutissage pour former une coupelle (5, 24),
    étirer la coupelle en au moins une passe d'étirage pour former un corps de boíte comprenant une partie de base et une partie de paroi latérale dressée (25), la partie de paroi latérale dressée présentant une épaisseur globale inférieure à la partie de base.
  11. Procédé selon la revendication 10, dans lequel dans la feuille de stratifié, la couche de polymère centrale P présente une épaisseur entre 100 et 500 µm et chacune des feuilles métalliques Mi et Mc présente indépendamment une épaisseur entre 25 et 150 µm.
EP95904223A 1993-12-01 1994-11-30 Boites embouties/etirees de structure metalloplastique et leur procede de fabrication Expired - Lifetime EP0731738B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9314619 1993-12-01
FR9314619A FR2713138B1 (fr) 1993-12-01 1993-12-01 Boîtes embouties-étirées en complexe métalloplastique et leur procédé de fabrication.
PCT/US1994/013922 WO1995015226A1 (fr) 1993-12-01 1994-11-30 Boites embouties/etirees de structure metalloplastique et leur procede de fabrication

Publications (3)

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EP0731738A1 EP0731738A1 (fr) 1996-09-18
EP0731738A4 EP0731738A4 (fr) 1997-08-27
EP0731738B1 true EP0731738B1 (fr) 2001-06-06

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EP95904223A Expired - Lifetime EP0731738B1 (fr) 1993-12-01 1994-11-30 Boites embouties/etirees de structure metalloplastique et leur procede de fabrication

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EP (1) EP0731738B1 (fr)
JP (1) JP3605113B2 (fr)
AU (1) AU1300095A (fr)
DE (1) DE69427408T2 (fr)
ES (1) ES2158073T3 (fr)
FR (1) FR2713138B1 (fr)
WO (1) WO1995015226A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6098829A (en) * 1994-11-30 2000-08-08 Mchenry; Robert J. Can components having a metal-plastic-metal structure
DE19600746A1 (de) * 1996-01-11 1997-07-17 Hali Handels Und Lizenzverwert Kappenartige Tiefziehteile und Verfahren zu deren Herstellung
NL1008468C2 (nl) 1998-03-04 1999-09-07 Hoogovens Staal Bv Werkwijze voor de vervaardiging van een bus door wandstrekken.
JP5975573B2 (ja) * 2013-06-05 2016-08-23 株式会社神戸製鋼所 角形電池ケースの成形方法
CN103978085B (zh) * 2014-04-08 2016-01-20 江门市新会区同达化工机械制造有限公司 一种冲压成形方法
JP7000674B2 (ja) * 2015-12-01 2022-01-19 東洋製罐グループホールディングス株式会社 金型
CN112427562B (zh) * 2020-11-02 2023-09-26 中材科技(成都)有限公司 一种压力容器钢质内胆的卧式冷拉深设备及其冷拉深方法

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US1375305A (en) * 1921-04-19 Battery-electrodes
US3760751A (en) * 1971-10-29 1973-09-25 Pittsburh Aluminum Container body and a method of forming the same
AU528449B2 (en) * 1979-05-21 1983-04-28 Dow Chemical Company, The Formable metal-plastic-metal laminates
DE3162065D1 (en) * 1980-02-21 1984-03-08 Basf Ag Process for making ductile laminates
CA1179589A (fr) * 1980-06-26 1984-12-18 Dominic I. Nelson-Ashley Ouvrages comprenant un element de polyethylene liaisonne a un support metallique, et methode de fabrication connexe
DE3113428A1 (de) * 1980-08-18 1982-04-01 Schweizerische Aluminium AG, 3965 Chippis Verfahren zur herstellung einer metall-kunststoffverbundfolie sowie eine nach dem verfahren hergestellte verbundfolie
EP0115103B1 (fr) * 1983-01-24 1987-11-25 Sumitomo Metal Industries, Ltd. Laminés sandwich métal-plastique-métal utilisables pour être ouvrés
GB8913209D0 (en) * 1989-06-08 1989-07-26 Metal Box Plc Method and apparatus for forming wall ironed articles
JPH0675737B2 (ja) * 1989-06-27 1994-09-28 東洋製罐株式会社 ツーピース缶用缶胴の成形法
CH681610A5 (fr) * 1990-04-26 1993-04-30 Alusuisse Lonza Services Ag
GB2246535B (en) * 1990-07-28 1994-01-26 Cmb Foodcan Plc Method of manufacturing a wall ironed can

Also Published As

Publication number Publication date
EP0731738A1 (fr) 1996-09-18
DE69427408D1 (de) 2001-07-12
EP0731738A4 (fr) 1997-08-27
WO1995015226A1 (fr) 1995-06-08
FR2713138A1 (fr) 1995-06-09
DE69427408T2 (de) 2002-05-02
AU1300095A (en) 1995-06-19
JPH09511182A (ja) 1997-11-11
JP3605113B2 (ja) 2004-12-22
ES2158073T3 (es) 2001-09-01
FR2713138B1 (fr) 1996-01-12

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