Method of removing gas from the cavity and stabilizing the core

Details Method of removing gas from the cavity and stabilizing the core Method of removing gas from the cavity and stabilizing the core

1989-05-26

1991-05-07

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432812, 26432815, 425549, 425570, 425577, B29C 4522

Patent

active

050135139

ABSTRACT:
The method and apparatus includes an injection molding assembly including a mold, a core and a mold cavity therebetween wherein said mold cavity has a base, a peripheral area of said base and a central area of said base, at least two injection gates for injecting plastic material into said mold cavity situated adjacent the peripheral area of the mold cavity in a substantially balanced fashion, a source for injecting plastic material through the injection gates whereby molten plastic advances from the injection gates in the mold cavity to force gas in advance of the plastic and to stabilize the core, and means for venting the gas from the mold cavity.

REFERENCES:
patent: 3671159 (1972-06-01), Greenberg et al.
patent: 3800027 (1974-03-01), Tsutsumi
patent: 4083903 (1978-04-01), Gilbert et al.
patent: 4420452 (1983-12-01), van Dalen et al.
patent: 4702689 (1987-10-01), Schmidt et al.
Injection Molding Handbood, Rosato, 1986 pp. 186-189.

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