Method of molding resin-impregnated fabric layer using release s

Details Method of molding resin-impregnated fabric layer using release s Method of molding resin-impregnated fabric layer using release s

1976-11-05

1977-12-13

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264257, 264313, 264DIG78, 425 85, 425 89, 425388, 425389, 425405R, 425DIG44, 425DIG60, B29D 302, B29G 500

Patent

active

040629171

ABSTRACT:
Fiber reinforced plastic structural components having curved surface areas are produced in molds utilizing a bleeder cloth comprising a textile-like non-woven polyester fabric characterized by a fiber interlock value of at least 7 and a fiber entanglement completeness of at least 0.5. The utilization of this bleeder cloth allows quicker assembly of the mold components since cutting and forming are not necessary, proper pressure transmittal is ensured, and the air permeability, drape, stretchability, and resin holding capacity of the cloth are ideal. For producing the desired structural components with curved surface areas, at least one layer of resin pre-impregnated partially cured fabric is disposed in cooperation with a first mold section, a release liner is placed on the fabric, and a bleeder cloth according to the invention is placed on the release liner. A second mold section is placed on the bleeder cloth, and a pressure is applied to all the components of the mold while gases are evacuated through the release fabric and the bleeder cloth while all of the components of the mold are heated to completely cure the resin preimpregnated fabric.

REFERENCES:
patent: 2923978 (1960-02-01), Corzine
patent: 3899967 (1975-08-01), Powers
patent: 3954931 (1976-05-01), Helmuth et al.
patent: 3962394 (1976-06-01), Hall

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