Plastic skin envelopes for glass bottles and the like
AssigneeNational Distillers and Chemical Corporation
InventorsClaude J. Stiles, Daniel Tomo
Life of this patent
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Abstract
A method of producing a lightweight, strong, uniform, foamed layer containing tubular film with good opacity which can be heat-shrunk onto an annular substrate such as a glass bottle rapidly and uniformly is accomplished by co-extruding a low density polyethylene and a mixture of an ethylene polymer and a blowing agent under particular conditions and causing the blowing agent to decompose thereby foaming the ethylene polymer.
Claims8
A seamless, lightweight, strong, uniform, multiply, oriented foamed layer tubular preform laminate with good opacity adapted to be heat-shrunk onto a tubular substrate rapidly and uniformly, said laminate comprising first and second plies of plastic material in overlying adherent relation, said first ply comprising a low density polyethylene and said second ply comprising an expanded ethylene polymer, the ply of low density polyethylene being about 10-20% of the thickness of the laminate, the skrinkage along the length of said preform upon application of heat being about 70-90% and the shrinkage in the transverse direction being about 5-15%.
Dependencies are inferred from the claim text.