Method for high frequency molding of liquid plastic material

Details Method for high frequency molding of liquid plastic material Method for high frequency molding of liquid plastic material

1990-06-28

1991-12-03

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264255, 4251748E, B29C 3508, B29C 4514

Patent

active

050698354

ABSTRACT:
A method 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 method is applicable to manufacturing shaped parts, in particular for car manufacture.

REFERENCES:
patent: 4695420 (1987-09-01), Grawey et al.
patent: 4792425 (1988-12-01), Weaver
patent: 4839122 (1989-06-01), Weaver

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