Process for molding plastic articles

Details Process for molding plastic articles Process for molding plastic articles

1998-12-02

2000-08-08

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

2642972, 2643287, 2643288, 26432811, 264334, B29C 4402, B29C 4504

Patent

active

060997699

ABSTRACT:
Molded plastic articles are prepared in accordance with the process and apparatus of the present invention. A first mold cavity is filled via a feeding unit in engagement with a first mold cavity with plastic containing a volume expanding agent, the filled first mold cavity and feeding unit are moved away from each other and a second mold cavity and the feeding unit are moved into engagement with each other, the second mold cavity is filled with plastic containing a volume expanding agent via the feeding unit, the plastic is expanded in the first mold cavity via the volume expanding agent while the second mold cavity is in engagement with the feeding unit, and the expanded article is ejected from the first mold cavity.

REFERENCES:
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patent: 3771928 (1973-11-01), Gostyn et al.
patent: 4389358 (1983-06-01), Hendry
patent: 4413744 (1983-11-01), Babiol
patent: 4440377 (1984-04-01), Hujik
patent: 4783292 (1988-11-01), Rogers
patent: 4873049 (1989-10-01), Landwehr et al.
patent: 5082609 (1992-01-01), Rohrlach et al.
patent: 5304050 (1994-04-01), Vismara
patent: 5348458 (1994-09-01), Pontiff
patent: 5525278 (1996-06-01), Krosch et al.
patent: 5582789 (1996-12-01), Stein et al.

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