Thermoformed plastic containers with transparent windows and met

Details Thermoformed plastic containers with transparent windows and met Thermoformed plastic containers with transparent windows and met

1987-07-16

1988-03-01

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428 35, 428170, 264321, B32B 300

Patent

active

047285591

ABSTRACT:
A container component is made from microcellular foam material, no more than approximately 30 mils thick, having a core of very small uniformity distributed cells to provide uniform opacity that is locally eliminated by the application of heat and pressure to create window areas at least 60% as thick as the surrounding material.

REFERENCES:
patent: 3432380 (1969-03-01), Weber
patent: 3489270 (1970-01-01), Bixler et al.
patent: 3832428 (1974-08-01), Ryan
patent: 3958053 (1976-05-01), Ryan
patent: 4230759 (1980-10-01), Kauffman et al.
patent: 4473665 (1984-09-01), Martini-Vuedensky et al.

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