Process and apparatus for injection-molding foamed article

Details Process and apparatus for injection-molding foamed article Process and apparatus for injection-molding foamed article

1983-03-30

1985-03-26

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 54, 26432817, 264DIG83, 425145, 425166, 425558, 425573, 425817R, B29D 2700, B29F 103

Patent

active

045072558

ABSTRACT:
A process and apparatus for injection-molding a foamed article including a foamed core and an outer solid skin layer of unfoamed synthetic resin are provided. A first molten flow of the unfoaming synthetic resin is at first injected into a mold to form the outer solid skin layer. Subsequently, a second molten flow of a synthetic resin containing a foaming agent is fed into the first molten flow without stopping the first flow and is then mixed and kneaded to form a kneaded mass. The kneaded mass is then injected into the mold to form the core portion. Since the first flow is continuously fed during one operation cycle, the product molded article has no hesitation marks.

REFERENCES:
patent: 3817669 (1974-06-01), Buckner
patent: 3966372 (1976-06-01), Yasuike et al.
patent: 4067673 (1978-01-01), Hendry
patent: 4134687 (1979-01-01), Eckardt
patent: 4155969 (1979-05-01), Hendry
patent: 4255367 (1981-03-01), Wallace et al.

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