Cross-linking and foaming injection molding process for ethyleni

Details Cross-linking and foaming injection molding process for ethyleni Cross-linking and foaming injection molding process for ethyleni

1975-10-30

1977-09-13

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264329, 264DIG5, 264DIG18, 264DIG83, B29D 2700, B29F 108

Patent

active

040482758

ABSTRACT:
An injection molding process for forming cross-linked, foamed moldings of an ethylenic polymer by passing a molding composition comprising an ethylenic polymer/cross-linking agent/foaming agent blend through the cylinder of an injection molding machine without substantially decomposing the cross-linking agent and the foaming agent, introducing the molding composition into a molding composition holding chamber provided at the exit end of the cylinder of the injection molding machine to decompose the cross-linking agent and the foaming agent therein, and injecting the molding composition into a mold.
The invention also provides apparatus for carrying out the process comprising an injection molding cylinder for conveying and plasticizing the molding composition and a molding composition holding chamber provided at the exit end of the cylinder.

REFERENCES:
patent: 2530289 (1950-11-01), Cook
patent: 3098832 (1963-07-01), Pooley et al.
patent: 3376238 (1968-04-01), Gregorian et al.
patent: 3608145 (1971-09-01), Baker et al.
patent: 3776989 (1973-12-01), Annis et al.
patent: 3878285 (1975-04-01), Souffie
patent: 3923922 (1975-12-01), Grant
patent: 3937447 (1976-02-01), Alwes et al.
Menges, Prof. G. and W. Elbe, "Injection Machine Design in the 1980's," in Plastics and Polymers, June 1972, pp. 153-157.

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