Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1982-02-18
1983-11-08
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264106, 425149, 425810, B29F 106
Patent
active
044141670
ABSTRACT:
A method for molding an article, such as a preform, used in making information recorded discs, includes use of 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: 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.
Patel Bhupendra P.
Prusak John J.
Cohen Donald S.
Czaja Donald E.
Housel James C.
Morris Birgit E.
RCA Corporation
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