Method of using breather materials for high pressure molding

Details Method of using breather materials for high pressure molding Method of using breather materials for high pressure molding

1987-12-28

1991-01-08

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264257, 264510, 264571, 425388, B29C 4312, B29C 4318, B29C 4356

Patent

active

049833413

ABSTRACT:
A method of molding using breather layers particularly adapted for use for removing fluids from articles during molding, that retain fluid paths at high pressures. Polymer containing articles are molded using a breather layer that is substantially capable of maintaining a fluid path under pressures up to about 20.7 MPa. The method includes transferring pressure via a gas impervious layer to the article. The breather layer is disposed between the article and the gas impervious layer and provides a fluid path for removing fluids from the article. An exemplary breather layer includes at least two flexible layers of beads that are dimensionally stable at pressures up to about 20.7 MPa. These breather layers facilitate high pressure molding by maintaining a sufficient fluid path size so that volatiles can be easily vented. This results in stronger, denser composite articles.

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patent: 4217157 (1980-08-01), Stoltze
patent: 4243368 (1981-01-01), Garabedian
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patent: 4267142 (1981-05-01), Lankheit
patent: 4325899 (1982-04-01), Cole
patent: 4350545 (1982-09-01), Garabedian
patent: 4409048 (1983-10-01), Hatch et al.
patent: 4686271 (1987-08-01), Beck et al.
patent: 4714424 (1987-12-01), Kinugasa

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