Method of vacuum-pressure injection moulding

Details Method of vacuum-pressure injection moulding Method of vacuum-pressure injection moulding

1974-10-24

1976-02-10

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264 85, 264328, 264329, B29D 0904, B29D 2900

Patent

active

039377784

ABSTRACT:
In a method for injection moulding of the type wherein gas or vapor evolved from the resin being moulded is vent through a vent opening provided for a heated cylinder at an intermediate point thereof, the vent opening is maintained at a reduced pressure during metering and a small quantity of vaporizable liquid is admitted into the vent opening during injection for increasing the pressure therein.

REFERENCES:
patent: 2207426 (1940-07-01), Bailey
patent: 3177272 (1965-04-01), Plymale
patent: 3253303 (1966-05-01), Bradt
patent: 3485905 (1969-12-01), Compp
patent: 3488412 (1970-01-01), Bielfeldt
patent: 3577360 (1971-05-01), Immel
patent: 3822331 (1974-07-01), Cogliano

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