Injection molding method using surge pressure

Details Injection molding method using surge pressure Injection molding method using surge pressure

1989-06-20

1991-10-22

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264161, 2643281, B29C 4577

Patent

active

050593706

ABSTRACT:
A surge of high pressure is momentarily applied to a plasticized molding material injected in a mold cavity immediately after the completion of an injection process so that molding shrinkage and orientation which are caused in the material in the mold cavity in the course of solidification of the material on cooling can be substantially eliminated to thereby enable super-precision injection molding.

REFERENCES:
patent: 3989436 (1976-11-01), McNeely et al.
patent: 4879082 (1989-11-01), Kudo et al.

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