Cavity expanding and contracting foam injection molding method

Details Cavity expanding and contracting foam injection molding method Cavity expanding and contracting foam injection molding method

1994-09-30

1996-08-20

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 54, 2643287, B29C 4402, B29C 4410

Patent

active

055476210

ABSTRACT:
A foam injection molding method which makes it possible to control physical properties of high-expansion ratio molded parts with a high degree of freedom of interfacial configuration. With a molding material charged in a closed initial cavity (8) formed by three mold elements (1, 2 and 3), an intermediate cavity having a smaller volumetric capacity than that of the initial cavity (8) and an intermediate cavity having a larger volumetric capacity than that of a final cavity (9) are formed by moving at least one mold element (3) relative to the other two mold elements (1 and 2) without moving these mold elements (1 and 2) while keeping the cavity closed, which is formed by the three mold elements (1, 2 and 3).

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