Press mold for producing microcellular shaped pieces of dimensio

Details Press mold for producing microcellular shaped pieces of dimensio Press mold for producing microcellular shaped pieces of dimensio

1975-02-26

1977-09-13

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

425129S, 425542, 425812, 249109, 249141, B29D 2700, B29F 100

Patent

active

040478602

ABSTRACT:
Press molds for vulcanizing plastic materials comprise a pair of mold parts defining between them a mold cavity. One of the parts is a die and the other is a cover plate that defines with the die the mold cavity. A hot liquid is introduced into a lower portion of the mold cavity through the die and gas is removed from the upper portion of the mold cavity through the cover plate. As a result, both prevulcanization and after vulcanization can be achieved in one single press mold, by surrounding the material in the mold with hot liquid in the prevulcanization and then withdrawing the liquid when the molded material fills the die cavity in the second stage of vulcanization.

REFERENCES:
patent: 2766484 (1956-10-01), Sanderson
patent: 2803043 (1957-08-01), Stephens
patent: 3160921 (1964-12-01), Ludwig
patent: 3481003 (1969-12-01), Taylor et al.
patent: 3677678 (1972-07-01), Christie et al.

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