Method for preparing perforated film

Details Method for preparing perforated film Method for preparing perforated film

1988-08-19

1990-12-18

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264145, 264154, 264156, 264284, 264DIG47, B29C 6720, B29C 5904

Patent

active

049784862

ABSTRACT:
A method for preparing a perforated film, for use in the field of sanitary, food packaging and industrial materials, by thermally embossing an oriented polyolefin film with an embossing roll having a large number of protruding knobs and a pinch roll which presses the film against the knobs, and simultaneously taking up the resultant film at a rate not less than the processing speed of the embossing roll.

REFERENCES:
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patent: 3243488 (1966-03-01), Hannauer, Jr. et al.
patent: 3496260 (1970-02-01), Guenther et al.
patent: 3649611 (1972-03-01), Okumura et al.
patent: 3775521 (1973-11-01), Yamamoto et al.
patent: 4272473 (1981-06-01), Riemersma et al.
patent: 4472328 (1984-09-01), Sugimoto et al.
patent: 4793956 (1988-12-01), Nogiwa et al.
patent: 4797246 (1989-01-01), Reinke et al.

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