Bottles and jars – Closures – Cap type
Patent
1994-03-16
1997-04-01
Seidleck, James J.
Bottles and jars
Closures
Cap type
215347, 215349, 428 664, 428 365, 4283197, B65D 5304
Patent
active
056157894
ABSTRACT:
A cap liner and method for producing a cap liner which is particularly suited for use with a cap employed on a hot filled container. The liner includes a disc having one or more outer layers and an intermediate foamed layer bonded thereto. Preferably, the outer layer is formed of a copolymer of polypropylene and polyethylene. The intermediate layer can include a homogeneous admixture of polypropylene and polyethylene or an admixture of polyethylene, a copolymer of polyethylene and polypropylene and ethylene vinyl acetate. One method for producing the cap liner involves mechanically mixing at room temperature polypropylene and polyethylene to form a desired homogeneous admixture for each layer, and then co-extruding the admixtures at approximately 320.degree.-415.degree. F. to form the bonded outer and intermediate layers. Another method involves extruding the copolymer outer layer to the intermediate layer admixture to form the bonded cap liner. Alternatively, the intermediate layer may be formed of foamed polyethylene.
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Finkelstein Harvey
Flores Victor
Singer Murray
Verdel Anatoly
Seidleck James J.
Tri-Seal International, Inc.
Williamson Michael A.
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