Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1989-05-04
1990-09-04
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
26432816, 425562, 425564, 425812, B29C 4522
Patent
active
049540734
ABSTRACT:
An apparatus for high frequency molding by injecting a liquid plastic material under pressure into a mold, while simultaneously venting the inside cavity of the mold, optionally by applying to suction. In order to overmold and/or mold onto a prisoner a part in the form of a closed loop, a sealing insert (i) is disposed between the openings into the mold for its injection nozzle (17) and its venting nozzle (18). The shape of the insert corresponds to the profile of the mold, and the insert is made of a material having the same nature as the injected plastic material, such that the insert melts and is welded to the molded or overmolded part when the high frequency electric field is applied by means of an appropriate generator. The injection and the venting nozzle are controlled by respective double action actuator devices fitted with pistons and piston rods made of a material which does not exhibit dielectric loss, and forming a removable unit assembly. The invention is applicable to manufacturing shaped parts, in particular for car manufacture.
REFERENCES:
patent: 4498860 (1985-02-01), Gahan
patent: 4800049 (1989-01-01), Gras
Gras Elie
Oriez Robert
Anver
Heitbrink Timothy W.
Woo Jay H.
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