Molding device having a ring-gating and hole forming valve gate

Details Molding device having a ring-gating and hole forming valve gate Molding device having a ring-gating and hole forming valve gate

1994-08-05

1995-06-13

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

With means between charger and mold to cut off flow of...

264107, 425566, 425810, B29C 4523

Patent

active

054236720

ABSTRACT:
In order to facilitate the formation of a plastic member with an aperture in a central portion thereof, a ring gating valve arrangement is provided with a multi-piston servo arrangement which enables a specially configured pin to be stepwisely reciprocated back and forth within a molding device. The pin is formed with a land at one end which is dimensioned and shaped to produce the required aperture. The pin further features a channel structure which includes an annular recess adapted to permit plastic to flow into the center of the mold cavity area when the pin is thrust to a predetermined location. After the cavity is filled with hot plastic, the pin is retracted to a position wherein the annular recess is located within a removable gate bushing and the shaped land is pulled up until it is appropriately located in the mold cavity area. As the injected plastic cools and solidifies, the shaped land acts as the aperture molding pin and forms a clean aperture in the molded part. After solidification, the pin is retracted and the mold is opened to permit the molded part to be ejected.

REFERENCES:
patent: 4272236 (1981-06-01), Rees et al.
patent: 4705473 (1987-11-01), Schmidt
Webster's Ninth New Collegiate Dictionary, 1986, p. 190.

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