Receptacles – Receptacle having flexible – removable inner liner – Means for venting air trapped between the liner and its...
Patent
1996-10-29
1998-07-21
Moy, Joseph M.
Receptacles
Receptacle having flexible, removable inner liner
Means for venting air trapped between the liner and its...
428 359, 428461, 295274, 426126, B65D 2514
Patent
active
057823758
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
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.
Hereinafter, the terms 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.
There are numerous documents describing layered metal-plastic constructions. The majority of these concern metal-polymer or poly-metal-polymer constructions, metal-polymer-metal constructions being rarer.
Of these documents that do mention MPM constructions, none teaches any preferred range of materials and thicknesses which are specially suitable for making drawn and ironed beverage or food cans.
By way of illustration, WO 82/00020, published on Jan. 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. 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.
Although there is no explicit teaching as to the desired absolute or relative examples of simple metal-plastic constructions, the published application describes films of different types of polyethylene of 100 microns thickness that are heat sealed onto the plates of different metals, such as steel, tin-plated steel, steel coated with chrome-chrome oxide, or aluminum of a thickness of 210 microns. The specimens obtained are then formed into hollow articles by folding, stamping, drawing, wall-ironing. The adhesion of the coatings is compared and demonstrates the superiority of linear low density polyethylene (LLDPE).
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 microns with the following percentage distribution of the total thickness:
European Patent Application 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 drawin
REFERENCES:
patent: 3760751 (1973-09-01), Dunn et al.
patent: 4339483 (1982-07-01), Lieno et al.
patent: 4358493 (1982-11-01), Ohtsuki et al.
patent: 4741934 (1988-05-01), Terayama et al.
patent: 5181409 (1993-01-01), Heyes et al.
patent: 5193265 (1993-03-01), Muggli et al.
Iron & Steel, Feb. 1953, pp. 63-66, XP000579822; S.Y. Chung et al.: "Cylindrical Shells an Experimental Investigation into Redrawing".
McHenry Robert J.
Petit Dominique
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