Method of producing molded resin product

Details Method of producing molded resin product Method of producing molded resin product

1997-11-10

1999-05-04

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 53, 264572, B29C 4402

Patent

active

059001984

ABSTRACT:
A molded resin product can be produced without shrinkage on the surface by providing a hollow part and foam cells therein. Before molten resin containing a foaming gas is introduced into a cavity between molds, the cavity is preliminarily filled with a gas with pressure high enough to prevent the foaming gas from beginning to foam or expand. While the molten resin is injected into the cavity or after its injection is over, another high-pressure gas is injected through at least one gas injection nozzles into the resin where a hollow part is desired. As the nozzle is retracted from the cavity, the high-pressure gas is removed from the cavity, allowing the foaming gas to begin to foam and expand, forming a hollow part and foam cells inside the molded product.

REFERENCES:
patent: 4115491 (1978-09-01), Hanning
patent: 4474717 (1984-10-01), Hendry
patent: 4824732 (1989-04-01), Hendry et al.
patent: 4942006 (1990-07-01), Loren
patent: 5093053 (1992-03-01), Eckardt et al.
patent: 5656215 (1997-08-01), Eckardt et al.
patent: 5667738 (1997-09-01), Krajcir

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