Method of producing glass fiber mat reinforced plastic panels

Details Method of producing glass fiber mat reinforced plastic panels Method of producing glass fiber mat reinforced plastic panels

1987-07-16

1988-11-01

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264259, 264274, B29C 4330

Patent

active

047818760

ABSTRACT:
A method of producing a smooth surface on a premolded glass fiber reinforced plastic panel where protruding fibers would otherwise produce a rough surface. The method is practiced by coating the surface of a premolded glass fiber reinforced plastic panel maintained at or near the molding temperature with a polyurethane composition, and applying molding pressure on the coated surface to cause the coating resin to flow and fill the valleys between the protruding fibers. The molding pressure is released while the coating resin is still in its fluid state. A finished, smooth panel is made by this process which can be readily painted and used as an automotive exterior body panel. Optionally, a layer of a predecorated sheet material can first be placed in the upper mold cavity of a mold, then compressed against a premolded panel positioned in the lower mold cavity with a layer of coating resin sandwiched in between. A finished, predecorated panel having a predecorated sheet permanently bonded to the panel is produced by this process. The finished, predecorated panel can be readily used as an automotive exterior body panel without further painting or decorating.

REFERENCES:
patent: 4245006 (1981-01-01), Shanoski
patent: 4438062 (1984-03-01), Griffith et al.
patent: 4477405 (1984-10-01), Makhlouf et al.
patent: 4610835 (1986-09-01), Ghavamikia
Plastics World, Mar. 1978, "Class A Finish on SMC", pp. 48-51.

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