Injection mold internal pressure equalization system and method

Details Injection mold internal pressure equalization system and method Injection mold internal pressure equalization system and method

1997-06-24

1999-12-07

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

2643281, 425546, 425555, B29C 4500

Patent

active

059977973

ABSTRACT:
An injection mold system and corresponding method that equalizes pressure of flowable plastic dispensed into an injection mold cavity. A gate in communication with the mold cavity introduces a quantity of flowable plastic into the cavity at a predetermined pressure. A gas inlet in communication with the mold cavity at a mold cavity location remote from the gate introduces a gas into the mold cavity to pack the flowable plastic in the mold cavity at a pressure corresponding generally to the predetermined pressure, to thereby minimize the formation of sink marks and warpage on an injection molded part formed therein. The present invention insures formation of the part with a highly finished appearance surface and eliminates the need for painting or otherwise additional finishing of the part.

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patent: 5558824 (1996-09-01), Shah et al.
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