Injection apparatus for molding synthetic resin hollow or foamed

Details Injection apparatus for molding synthetic resin hollow or foamed Injection apparatus for molding synthetic resin hollow or foamed

1997-01-30

1998-07-28

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264572, 425561, B29C 4518

Patent

active

057859990

ABSTRACT:
An injection apparatus capable of carrying out injection and filling of a resin and injection of a gas making use of an injection screw or injection plunger for the injection of a high-pressure gas comprises an injection screw 5 having a conical injection head 3 at the front end thereof and a ring valve 4 around a rear portion of the injection head, an injection cylinder the interior of a front end portion of which equipped with a nozzle member is formed as a tapered surface in accordance with the injection head 3 and can be closed by its contact with the injection head 3 and which contains the injection screw 5, gas flow passages 12 and 8 provided from the front end of the injection head 3 to a rear end portion of the injection screw 5, an opening/closing pin 17 inserted into the gas flow passage 12 in the injection head in such a manner that it can move together with a piston at the rear end of the injection head, and an actuation gas flow passage 10, provided inside the gas flow passage 8, for applying pressure to the piston 16 so as to close the gas flow passage 12 with the opening/closing pin 17.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 5030077 (1991-07-01), Orimoto et al.
patent: 5054689 (1991-10-01), Hunerberg et al.
patent: 5080570 (1992-01-01), Baxi et al.
patent: 5131830 (1992-07-01), Orimoto et al.
patent: 5151278 (1992-09-01), Baxi et al.
patent: 5505891 (1996-04-01), Shah
patent: 5670112 (1997-09-01), Csonger et al.

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