Three-deck vulcanizing press

Details Three-deck vulcanizing press Three-deck vulcanizing press

1978-05-15

1979-05-08

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Gang-press, plural parallel leaves or platens

425339, B30B 702

Patent

active

041534050

ABSTRACT:
Relatively simple modifications of an existing three-deck vulcanizing press make it possible to greatly improve press productivity with a small investment in new equipment. The press is modified by providing a manually or automatically controlled wedge lock assembly including separate power locking means located adjacent the upper and lower platens, respectively, and having releasable wedge means for locking each pair of mold halves together.
In a typical cycle for manufacture of rubber articles, each vulcanizing mold is held open for a period of time, such as 30 to 60 seconds, to permit unloading of the vulcanized rubber pieces, cleaning and/or coating of the mold surfaces, and reloading of the mold cavities as required while the other mold is locked in a closed position and heated to continue the curing of the rubber. After the open mold has been processed, the ram is advanced to close the mold and the mold is filled with rubber and then "bumped" as required one or more times and subjected to a high pressure, such as 1500 to 3000 pounds per square inch or more, over a short forming period, such as 20 to 30 seconds, to provide the uncured rubber with the desired shape and to eliminate entrapped gases. During the application of high pressure the power locking means are actuated to lock the freshly loaded mold in closed position and to unlock the other mold. The ram is then retracted to move the other mold to an open position for unloading, cleaning and reloading and the cycle is repeated.

REFERENCES:
patent: 2209141 (1940-07-01), Schnell
patent: 2253611 (1941-08-01), Davis
patent: 2331015 (1943-10-01), Dawes et al.
patent: 2404165 (1946-07-01), Carver
patent: 2869177 (1959-01-01), Jurgeleit
patent: 3075237 (1963-01-01), Soderquist
patent: 3129462 (1964-04-01), Borah
patent: 3802818 (1974-04-01), Watanabe et al.

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