Apparatus for injection foam molding

Details Apparatus for injection foam molding Apparatus for injection foam molding

1975-09-02

1978-01-10

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

264DIG83, 425147, 425557, 425817R, B29D 2700

Patent

active

040676730

ABSTRACT:
An apparatus for the manufacture by foam molding of plastic products by first injecting into a mold solid plastic resin and then injecting a foamed plastic resin of the same basic composition as the solid plastic resin. The process and apparatus consisting of a single extruder and single injection chamber wherein the solid and foamed plastic resin are extruded and stored until shot into the mold by hydraulic pressure. Controls are provided for the correct amount of each type of resin to be extruded and stored and the process can be adapted so that the sprue portion of the product will be solid resin and by a simple addition, coloring may be added so that the basic resin, method or apparatus will not require changes.

REFERENCES:
patent: 3436446 (1969-04-01), Angell
patent: 3884608 (1975-05-01), King
patent: 3891362 (1975-06-01), DeVita
patent: 3941529 (1974-07-01), Klingebiel

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