 Fuel cell electrolyte supply system and apparatus |
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| Method of producing furnace carbon black |
| OF THE INVENTION The invention is explained in more detail below in two embodiments with reference ... |
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| Protective interlayer for high temperature solid electrolyte electrochemical cells |
| The above problems have been solved and the above needs met, most generally, by providing a novel ... |
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| Separator for starved electrolyte lead/acid battery |
| OF THE INVENTION The articles utilizing the compositions of this invention are denominated "... |
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| Sealed lithium-type electrochemical cell |
| What I claim as new and desire to secure by Letters Patent of the United States is: 1. A sealed ... |
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| Lithium halide cell |
| Pursuant to the present invention, lithium-halide primary cells can be made having a variety of ... |
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| Acid mixture for the electrolyte of a galvanic battery, and a method for producing said mixture |
| What is claimed is: 1. An electrolyte precursor composition for use in a galvanic battery in which ... |
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| Lithium-bromine cell |
| OF THE ILLUSTRATED EMBODIMENTS Referring now to FIG. 1, a lithium-bromine cell according to the ... |
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| Film casette |
| What is claimed is: 1. A film cassette for containing film-sheets each having an engagement hole ... |
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Multi-layer sheet structure, method of making same and containers made therefrom
| Details |
Inventors: Redding, Dwight D.;
Assignee: American National Can Company (Chicago, IL)
Primary Examiner: Thomas; Alexander S.
Assistant Examiner:
Attorney, Agent or Firm: Stenzel; Robert A.
A multi-layer paperless sheet structure having an oriented substructure is provided for making tubular containers for packaging dentifrice and other products. The sheet structure comprises a unique combination of polymer layers, including a uniaxially oriented polymer (polypropylene or high density polyethylene) layer. The sheet structure has two exterior heat sealable surfaces for forming the tubular containers by lap heat seal and the resulting containers exhibit improved strength and deadfold retention properties. A method is also provided for forming the sheet structure with its oriented substructure. |
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DETAILED DESCRIPTION The foregoing objects and advantages of the present invention are realized by providing a unique multi-layer laminate sheet structure, including an oriented substructure, which can be formed into containers and tubes for packaging various products, Due to the uniqueness of this multi-layer laminate structure, the resulting containers are resistant to chemical attack by the packaged ingredients, exhibit acceptable deadfold crease retention properties and can withstand rough handling during shipment without failure due to cracks.
In one embodiment of the invention, the sheet structure comprises, in order, a first heat sealable layer on a first one of two exterior surfaces, a first adhesive layer of ethylene acrylic acid copolymer, and a layer of metal foil.
A second adhesive layer of ethylene-acrylic acid copolymer adheres the foil to a first layer of polyethylene or ethylene copolymer.
On the opposing surface of the first polyethylene layer is a second layer of polyethylene or ethylene copolymer.
The second polyethylene layer is adhered through a first primer to a layer of uniaxially oriented polypropylene having an orientation ratio between about 2/1 and about 6/1A third adhesive layer adheres the polypropylene layer to a second heat sealable layer on the second exterior surface of the sheet material.
Significantly, the polypropylene layer is within about 1 to about 1.
5 mil of the second exterior surface of the sheet structure.
In a preferred structure of this invention, the second heat sealable layer, the third adhesive layer, and the polypropylene layer, and produced by coextrusion as a three-layer film substructure, and unixially oriented simultaneously, the orientation ratio being between about 2/1 and about 6/1.
In order that the sheet material of the invention may be formed into a tubular container, the first and second heat sealable layers must be compatible for heat sealing to each other.
The invention also contemplates providing a flexible dispensing tube made of the multiple layer sheet structure hereinabove described, with the uniaxially-oriented layers disposed toward the exterior surface of the tube
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Fuel Cells 
