Production of asymmetric porous film materials

Details Production of asymmetric porous film materials Production of asymmetric porous film materials

1979-04-20

1981-07-07

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

2642888, B29D 724, B29C 1702

Patent

active

042774292

ABSTRACT:
Porous film materials composed of polytetrafluoroethylene having an asymmetric structure are produced by stretching the film using a pair of revolving rolls which are heated to a temperature lower than the melting point of the film. Stretching is produced by revolving the two rolls at different speeds which also tends to produce a compressive force in the thickness of the film. The rolls are heated to different temperatures to produce a temperature difference of preferably 50.degree. C. or more. The combination of the compressive force and the temperature gradient in the thickness of the film is believed to produce the asymmetric structure in the resulting porous film materials which are characterized by a fiber structure in the surface which is different from that in the back.

REFERENCES:
patent: 2642625 (1953-06-01), Peck
patent: 3281511 (1966-10-01), Goldsmith
patent: 3796785 (1974-03-01), Rest et al.
patent: 3816886 (1974-06-01), Van Cappellen
patent: 3953566 (1976-04-01), Gore
patent: 4049589 (1977-09-01), Sakane

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