Positive pressure mold

Details Positive pressure mold Positive pressure mold

1975-01-23

1976-04-20

Custer, Jr., Granville Y.

Plastic article or earthenware shaping or treating: apparatus

Sets of press couples comprising registering female mold...

425395, 425408, 425812, B29G 100

Patent

active

039515800

ABSTRACT:
In accordance with the present invention a positive pressure mold is provided wherein the mold cavity is sealed during the initial movement of the dies. The entrapped air is caused to escape at a controlled rate as the dies move together, building up a sufficient air pressure between the dies to distribute the workpiece or "preform" throughout the die cavity.

REFERENCES:
patent: 806472 (1905-12-01), Jeffrey
patent: 1454506 (1923-05-01), Christenson
patent: 2964791 (1960-12-01), McFarland
patent: 3008235 (1961-11-01), Royer et al.
patent: 3193884 (1965-07-01), Haynie et al.
patent: 3357072 (1967-12-01), Sutphin
patent: 3717693 (1973-02-01), Kohl et al.
patent: 3746491 (1973-07-01), Daly et al.

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