Injection molding process

Details Injection molding process Injection molding process

1984-04-23

1986-07-22

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

264513, 2643281, 26432816, B29C 4557

Patent

active

046018700

ABSTRACT:
An injection molding process for molding an article having accurate dimensions without sink marks includes the step of feeding high pressure air into the core portion of a shell or solid molded mass formed by the preceding injection molding step. Preferably, the wax material is injected into a mold cavity through a throttled inlet port to flow thereinto as a vigorous turbulent flow. A separate flow line is provided for feeding high pressure air in the preferred embodiment. More preferably, the volume of injected wax is substantially smaller than the volume of mold cavity.

REFERENCES:
patent: 2372630 (1945-03-01), Smith
patent: 4101617 (1978-07-01), Friederich
patent: 4106887 (1978-08-01), Yasuike, et al.

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