Injection nozzle provided with shut-off means

Details Injection nozzle provided with shut-off means Injection nozzle provided with shut-off means

1979-12-14

1981-06-09

Pavelko, Thomas P.

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...

B29F 103

Patent

active

042722365

ABSTRACT:
A nozzle for the introduction of liquefied plastic material into a mold has a channel terminating at one end in an injection orifice and adjoining at its other end a reduced bore serving for the guidance of a valve pin slidable with all-around clearance in that channel, the pin having a rear extremity projecting from its guide bore. A passage for the admission of liquefied molding material under pressure enters the channel at its junction with the reduced guide bore, rearwardly of a set of skew fins of the pin serving for additional guidance thereof in the channel and for imparting relative rotary motion to the flow and the pin. The orifice is blocked at the end of an injection operation by a pusher acting upon the projecting rear extremity; it is unblocked, upon withdrawal of the pusher, by the pressure of the molding material in the channel upon a forwardly facing annular shoulder of the pin.

REFERENCES:
patent: 3488810 (1970-01-01), Gellent
patent: 3491408 (1970-01-01), Natkins
patent: 3806295 (1974-04-01), Gellent
patent: 3941540 (1976-03-01), Driscoll

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