Plastic article or earthenware shaping or treating: apparatus – With separate apparatus cleaning means – Coacting with forming means or dough divider type trap chamber
Patent
1980-04-07
1982-06-15
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
With separate apparatus cleaning means
Coacting with forming means or dough divider type trap chamber
264 39, 425543, 425557, 425560, 425566, B29F 103, B29F 105
Patent
active
043348475
ABSTRACT:
An injection molding device for molding shaped bodies of natural or synthetic rubber comprising a heatable mold for shaping and vulcanizing therein the bodies to be molded and an elongated feed duct communicating with the mold via an injection nozzle. Plasticized material is fed into the duct by a plasticizing device and injection is effected by a piston-type injection device, both communicating with the duct. There is provided in the duct a valve which in its closed position blocks ingress of plasticized material into the duct but opens the duct for ingress of the material to be pressed by the injection means into the mold via the nozzle. The valve head is axially displaceable in the duct and mounts a member so dimensioned that in the open position of the valve it fully closes the nozzle opening, thereby pushing any residual plasticized material into the mold and in the closed position is completely withdrawn from the nozzle opening.
REFERENCES:
patent: 2505540 (1950-04-01), Goldhard
patent: 3247304 (1966-04-01), Ninneman
patent: 3461498 (1969-08-01), Ramaika
patent: 3709644 (1973-01-01), Farrell
patent: 3741704 (1973-06-01), Beasley
patent: 3847525 (1974-11-01), Bielfeldt
patent: 3985486 (1976-10-01), Hendry
patent: 3999923 (1976-12-01), Schrammel
Pavelko Thomas P.
Werner & Pfleiderer
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