Container closure seal and method of making

Details Container closure seal and method of making Container closure seal and method of making

1985-05-06

1987-01-06

Coan, James F.

Package making

Methods

Forming a cover adjunct or application of a cover adjunct to...

53419, 53442, 215246, B65B 6118

Patent

active

046336486

ABSTRACT:
A thin film adapted for forming seals about a closure attached to a container, which film is of uniaxially oriented polyolefin, will easily tear in a straight line in the oriented direction without the need of a tear strip, can be heat shrunk in the range of three to twenty percent in the oriented direction by exposure of about ten seconds to a temperature of about 225.degree. F., and is formed by uniaxially orienting polyolefin at a temperature in the range of 120.degree. to 170.degree. C. by stretching the polypropylene without restraining its edges at a draw ratio in the range of 3/1 to 10/1 and then quickly cooled to prevent substantial heat annealing.

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patent: 4000824 (1977-01-01), Han
patent: 4014734 (1977-03-01), Patterson
patent: 4134957 (1979-01-01), Yoshimura et al.
patent: 4177905 (1979-12-01), Winchell et al.
patent: 4237088 (1980-12-01), Yoshimura et al.

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