Process and apparatus for injection molding an article...

Details Process and apparatus for injection molding an article... Process and apparatus for injection molding an article...

B - Operations, Transporting

29

F

18/683

B29F 1/10 (1980.01)

Patent

CA 1041258

PROCESS AND APPARATUS FOR INJECTION MOLDING AN ARTICLE HAVING SANDWICH CONSTRUCTION Abstract of the Disclosure . First thermoplastic resin for forming the shell of an article is charged into the front portion of an injection cylinder and second thermoplastic resin for forming the core of the article is charged into the rear portion of the injection cylinder. Both resins are substantially separated, being contacted in only a central area of the cross-sectional plane of the injection cylinder. These thermoplastic resins are injected in a mass into a mold cavity with the second resin enveloped by the first resin, and finally solidified in the mold cavity resulting in a molded article having sandwich construction. Various sandwich articles can be obtained easily by means of a single injection molding machine. The process also allows repeated injection operations without exposure of the core material on the surface of the molded article. \ - 1 -

199935

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