Composition for making a plastic closure for liquid product cont

Details Composition for making a plastic closure for liquid product cont Composition for making a plastic closure for liquid product cont

1982-09-02

1985-02-12

Foelak, Morton

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

521 79, 521 98, 521134, 521143, 521149, B29D 2700, B29F 104

Patent

active

044991410

ABSTRACT:
A method for making closures resembling natural cork for sealing liquid product containers is described. A strand of expandable plastic material is injected into each mold cavity and is permitted to collect in that cavity in randomly oriented groups of coils which expand to fill the cavity and coalesce to create randomly oriented grain lines on the surface of the closure resembling the appearance of natural cork. Also described are methods of molding the closures which preclude the formation of leakage channels on the closure surface and preferred blends of plastic resins and pigment particles used to achieve the cork-like appearance.

REFERENCES:
patent: 3645930 (1972-02-01), Normanton et al.
patent: 4091136 (1978-05-01), O'Brien
patent: 4188457 (1980-02-01), Throp
patent: 4255372 (1981-03-01), Kuhnel et al.
patent: 4273880 (1981-06-01), Pump
patent: 4363849 (1982-12-01), Paisley et al.

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