Method for molding a plastic article of varied density

Details Method for molding a plastic article of varied density Method for molding a plastic article of varied density

1993-06-23

1995-08-01

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 54, 26432811, B29C 4406, B29C 4410

Patent

active

054378230

ABSTRACT:
A method of molding a plastic part with a controlled density whereby a blowing agent is added to a plastic material and the material is injected into a mold cavity of a mold unit. The interior walls of the mold cavity are maintained at a temperature sufficient to prevent the outer skin of the forming plastic article from producing gas bubbles. The volume of the mold cavity is increased to allow bubbles to produce and uniformly distribute themselves throughout the mold cavity and then a recompression phase is instituted whereby the desired density of the finished plastic article is achieved without voids or aberrations appearing in the surface of the plastic article.

REFERENCES:
patent: 3983196 (1976-09-01), Gray
patent: 4096218 (1978-06-01), Yasuike et al.
patent: 4729863 (1988-03-01), Muller et al.
patent: 5130075 (1992-07-01), Hara et al.
patent: 5252269 (1993-10-01), Hara et al.
patent: 5281376 (1994-01-01), Hara et al.
patent: 5336463 (1994-08-01), Hara et al.

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