Apparatus for reduction of mold cycle time

Details Apparatus for reduction of mold cycle time Apparatus for reduction of mold cycle time

1989-06-15

1990-08-28

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

Molding of thermosetting or cross-linking stock

425555, 425557, 249 65, 249 82, 249107, 264230, 264313, 264321, 264257, B29C 3342, B29C 4530

Patent

active

049521357

ABSTRACT:
An apparatus is disclosed for the reduction of mold cycle time. A heat recoverable member in a compressed state is placed within a channel defined relative to the surface of a mold. A hardenable liquid used to form the article then flows in an accelerated manner through the channel. Thermal energy supplied to the heat recoverable material thereafter causes the heat recoverable material to expand within the channel, thereby displacing the hardenable liquid from the channel. The temperature of gelation of the hardenable liquid and the recovery temperature of the heat recoverable material may be selected such that the channels are substantially filled by the heat recoverable material prior to the hardening of the hardenable liquid. In this manner, the heat recoverable material becomes flush with the surface of the mold prior to hardening of the liquid so as to yield an article of manufacture having a relatively planar surface.

REFERENCES:
patent: 2460820 (1949-02-01), Hagopian
patent: 2794233 (1957-06-01), Morton
patent: 2852807 (1958-09-01), Altschuler
patent: 3135640 (1964-06-01), Kepka
patent: 3309450 (1967-03-01), Rodgers
patent: 3832745 (1974-09-01), Dorfman
patent: 4116841 (1978-09-01), Borsangi
patent: 4124678 (1978-11-01), Stroupe
patent: 4148597 (1979-04-01), Larsen
patent: 4165287 (1979-08-01), Goyne
patent: 4238437 (1980-12-01), Rolston
patent: 4239625 (1980-12-01), Hlavinka

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