Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Molding pressure control means responsive to pressure at...
Patent
1983-05-27
1984-10-23
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Molding pressure control means responsive to pressure at...
100269R, 249 82, 425153, 425589, 425810, B29F 106
Patent
active
044785666
ABSTRACT:
An apparatus for molding an article, such as a preform, used in making information recorded discs, includes top and bottom mold members having recesses in their approved surfaces. The top mold member is mounted on the end of the piston rod of a pneumatic cylinder which is adapted to move the top mold member into mating relation with the bottom mold member so that the mold recesses form a mold cavity. The bottom mold member includes means for injecting a plastic mold material into the mold cavity. To mold a preform, the top mold member is moved by the pneumatic cylinder toward the bottom mold member to a collapsed position of the mold members where the mold cavity is of a volume less than the desired volume of the preform being molded. Plastic mold material is injected into the mold cavity until it is filled and additional mold material is injected into the mold forcing the top mold member away from the bottom mold member until the cavity is of the desired volume of the preform. The pneumatic cylinder is connected to an air reservoir so that when the top mold member is moved against the pressure of the pneumatic cylinder the air therein is forced into the air reservoir so as to maintain a substantially uniform, and preferably relatively low, pressure on the article being molded.
REFERENCES:
patent: 1183427 (1916-05-01), Brown
patent: 3429174 (1969-02-01), Fracke
patent: 3568592 (1971-03-01), Harvanek
patent: 3947203 (1976-03-01), Rose
patent: 4096218 (1978-06-01), Yasuike et al.
patent: 4281816 (1981-08-01), Carroll et al.
patent: 4390487 (1983-06-01), O'Mara
patent: 4411848 (1983-10-01), DeSantis
Patel Bhupendra P.
Prusak John J.
Cohen Donald S.
Housel James C.
Morris Birgit E.
RCA Corporation
Woo Jay H.
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