Process for making film

Details Process for making film Process for making film

1989-10-02

1991-11-26

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264564, 264146, 2642902, 264DIG47, 4253261, B29C 5520

Patent

active

050680706

ABSTRACT:
A process for making a film including forming a composite material of a thermoplastic film into an annular original film having at least two thick portions according to the inflation process, making the annular original film into a flat shape such that the thick portions are located at substantially opposite ends thereof, and stretching the flat annular original film by clamping the thick portions.

REFERENCES:
patent: 3398432 (1968-08-01), Quackenbush et al.
patent: 3634564 (1972-01-01), Okamoto et al.
patent: 4585604 (1986-04-01), Okuyama et al.
patent: 4793956 (1988-12-01), Nogiwa et al.
patent: 4794128 (1988-12-01), Kawaguchi et al.
patent: 4814124 (1989-03-01), Aoyama et al.
patent: 4829096 (1989-05-01), Kitamura et al.

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