Apparatus and method for injection moulding of plastic parts of

Details Apparatus and method for injection moulding of plastic parts of Apparatus and method for injection moulding of plastic parts of

1981-09-21

1984-08-07

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

With step of making mold or mold shaping, per se

Utilizing surface to be reproduced as an impression pattern

264317, B29C 108

Patent

active

044643241

ABSTRACT:
The invention relates to a device and method of using the device and plastic injection molding processes. A mold is provided utilizing a core inside the injection cavity of the mold. The core is prior to insertion of the mold subjected to a sub-freezing atmosphere. The core is then placed in the mold cavity wherein is injected the plastic material to mold the plastic part substantially surrounding the core. A thin film of air is formed around the "core" at the time of the injection of the plastic material thereby providing a substantial increase in surface finish to the plastic molded part. The core is made from a material which when heated will melt prior to the melting of the plastic part so that the core and part are removed from the cavity and subjected to a heating step thereby enabling removal of the core from the part.

REFERENCES:
patent: 3692892 (1972-09-01), Lemelson

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