Molding apparatus for producing molded resin products

Details Molding apparatus for producing molded resin products Molding apparatus for producing molded resin products

1999-01-13

1999-09-07

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264572, 425145, B29C 4516

Patent

active

059484462

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: 5141682 (1992-08-01), Steinbichler et al.
patent: 5637328 (1997-06-01), Shah et al.
patent: 5639405 (1997-06-01), Erikson

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