Process for preparing microporous polyethylene film by uniaxial

Details Process for preparing microporous polyethylene film by uniaxial Process for preparing microporous polyethylene film by uniaxial

1985-07-19

1986-11-04

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

2642107, 2642356, 2642888, B28B 1116

Patent

active

046209565

ABSTRACT:
An improved process for the production of a microporous polyethylene film by cold stretching and hot stretching a non-porous crystalline, elastic polyethylene film, whereby the permeability of the resultant film is improved by controlling both the stretching rates during cold and hot stretching and the sum of the changes in length during each stretching step.

REFERENCES:
patent: 3679538 (1972-07-01), Druin et al.
patent: 3801692 (1974-04-01), Zimmerman
patent: 3843761 (1974-10-01), Bierenbaum et al.
patent: 4138459 (1979-02-01), Brazinsky et al.

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