Injection/compression molding method, a die for injection/compre

Details Injection/compression molding method, a die for injection/compre Injection/compression molding method, a die for injection/compre

1993-02-16

1994-08-23

Vargot, Mathieu

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264334, 425139, 425555, 425556, B29C 4540, B29C 4556

Patent

active

053405285

ABSTRACT:
An injection molding die includes a fixed half die and a movable half die which has a core surface and which is provided with ejector pins. The ejector pins are held with their extremities retracted from the core surface to form recesses corresponding to compression allowances. The ejector pins are advanced toward the cavity to compress the compression allowances after a molten resin has been injected into the injection molding die in a manner which fills the cavity and the recesses. The compression with the ejector pins renders the pressure distribution int he cavity uniform, so that a molding can be formed with a high degree of accuracy and so that the injection molding cycle time can be reduced.

REFERENCES:
patent: 3670066 (1972-06-01), Valyi
patent: 3914086 (1975-10-01), Hujik
patent: 4555086 (1985-11-01), Kiyotomo
patent: 4820149 (1989-04-01), Hatakeyama et al.

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