Mechanical press for molding plastic parts

Details Mechanical press for molding plastic parts Mechanical press for molding plastic parts

1978-05-08

1979-04-03

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

With control means responsive to independently operated timer

For timing period mold is closed or period molding pressure...

425156, 425160, 4254512, 425590, 425383, 425394, B30B 132, B30B 1104, B30B 1516, B29C 1700

Patent

active

041474864

ABSTRACT:
A mechanical press includes a plurality of cylinders to provide different fluid pressures to a lower mold against an upper mold to mold plastic parts. A pair of accumulators sequentially apply a low pressure to the cylinders for a predetermined time during the initial heating period and a high pressure for a predetermined time during the final molding period. A control valve controls the rate at which the high pressure is applied.

REFERENCES:
patent: 2434849 (1948-01-01), Hess
patent: 2671246 (1954-03-01), Lester
patent: 2710988 (1955-06-01), Willcox et al.
patent: 2718662 (1955-09-01), Bohonnon et al.
patent: 2738550 (1956-03-01), Groves
patent: 2739349 (1956-03-01), Strauss
patent: 2831212 (1958-04-01), Belden
patent: 3664784 (1972-05-01), Sibley
patent: 3704973 (1972-12-01), Renfrew et al.
patent: 3924986 (1975-12-01), Seiler

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