Method and apparatus for injection molding utilizing expandable

Details Method and apparatus for injection molding utilizing expandable Method and apparatus for injection molding utilizing expandable

1979-07-16

1982-12-14

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

B29F 100

Patent

active

043637728

ABSTRACT:
A method and apparatus for virtually eliminating the web-like "jetting" lines on finished injection molded products by utilizing an expandable cavity which is initially set at a reduced or minimum size to intercept resin flow and disperse it as it enters the cavity, the resin being maintained under pressure within the partially filled cavity, wherein the cavity expands under pressure of the resin flowing therein until the finished size of the end-product is attained.

REFERENCES:
patent: 3016574 (1962-01-01), Fischer
patent: 3632729 (1972-01-01), Bielfeldt
patent: 4073844 (1978-02-01), Wada
patent: 4096218 (1978-06-01), Yasuike

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