Method of producing resin molded article

Details Method of producing resin molded article Method of producing resin molded article

1989-08-28

1990-11-06

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264257, 264266, 264296, 264321, 264324, 26432812, 264516, 264572, B29C 4516, B29C 4920, B29D 2200, B32B 3100

Patent

active

049684744

ABSTRACT:
A method of producing a resin molded article composed of a base material of a synthetic resin and a surface layer provided on the surface of the base material as one body, which includes preparing a mold having a cavity with an end molding portion for molding the end portion of the resin molded article and a body molded portion for molding the body of the resin molded article, the width of the end molding portion being larger than that of the body molding portion. The surface layer is disposed within the cavity of the mold, while disposing molten synthetic resin for the base material on one side of the surface layer so as to be held in the cavity of the mold. The mold is then closed and compressed gas is injected into the molten synthetic resin within the end molding portion so as to expand the molten synthetic resin. Finally, the molten synthetic resin is cured in the cavity. According to the present invention, a method of producing a resin molded article having an excellent outward appearance without warpage or deformation in the end portion of the base material can be provided wherein the step of disposing of the end portion such as bending inward, adhesion, etc., can be eliminated.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4873045 (1989-10-01), Fujita et al.

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