Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1986-06-04
1987-05-12
Van Balen, William J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
428 71, 428 76, 4283073, 4283088, B32B 306, B32B 514
Patent
active
046649743
ABSTRACT:
An improved method is described for molding an article having a core of foam and a surface reinforced by fiberglass cloth or the like, which enables more rapid setup for molding and which creates a stronger and more uniform article. The method includes laying several layers of dry tissue paper on the walls of the mold to form a first layer, laying dry fiberglass cloth over the first layer to create a second layer, and laying a sheet of dry tissue paper over the second layer to form a third layer. Foamable plastic is poured in the mold over the three layers and the mold is closed. As the plastic foams and expands, it first presses against the third layer to press it and the underlying first and second layers firmly against the mold walls to thereby position them evenly at the outer portion of the mold cavity. The foam material then penetrates the tissue paper of the third layer, the openings of the cloth of the second layer, and some of the layers of tissue paper of the first layer, before finally hardening. The outermost sheets of tissue paper facilitate release of the article from the mold, and also provide a conduit for the escape of gases during molding.
REFERENCES:
patent: 4025686 (1977-05-01), Zion
patent: 4268571 (1981-05-01), McCarthy
patent: 4379103 (1983-04-01), Doerfling
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