Method of injection molding an article with a cellular density d

Details Method of injection molding an article with a cellular density d Method of injection molding an article with a cellular density d

1998-03-13

2000-11-14

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 451, 264 54, 2643287, B29C 4406

Patent

active

061465623

ABSTRACT:
A method for producing an injection molded article with a gradually varying cellular density distribution, whereby the cellular density distribution varies between a first cellular structure of a high density and a second cellular structure of a relatively lower density. The method comprises forming a mold cavity be engaging a first mold section with a second mold section and injecting into the mold cavity an injection mixture which contains a blowing agent. A gradually varying density distribution is created according to a predetermined control function which depends on the mold cavity volume and the injection rate of the injection mixture.

REFERENCES:
patent: 3767742 (1973-10-01), Robin
patent: 3793415 (1974-02-01), Smith
patent: 3825637 (1974-07-01), Robin
patent: 5437823 (1995-08-01), Hettinga et al.
patent: 5876641 (1999-03-01), Le Clair et al.
patent: 5972259 (1999-10-01), Hettinga

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