Breather materials for high pressure molding

Details Breather materials for high pressure molding Breather materials for high pressure molding

1988-12-23

1989-11-14

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

425388, 4254051, 428240, 428241, 428242, 428283, B32B 516

Patent

active

048806889

ABSTRACT:
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 comprises 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 comprises 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.

REFERENCES:
patent: 4243368 (1981-01-01), Garabedian
patent: 4714424 (1987-12-01), Kinugasa et al.

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