Non-return valve for mottle charge in plastic injection molding

Details Non-return valve for mottle charge in plastic injection molding Non-return valve for mottle charge in plastic injection molding

1976-11-11

1977-12-27

Jenkins, Robert W.

Agitating

Rubber or heavy plastic working

With specified feed means

366 78, 366 87, B29B 106

Patent

active

040651088

ABSTRACT:
The charge forming barrel has a screw slidably and rotatably received therein, and the screw is specially suited for successively forming a mottle charge, a valve stud being mounted on the forward end of the screw, and this stud cooperating with a ring shaped non-return valve to close off rearward flow of the plasticized ingredients comprising the charge. The valve closes in a sliding or shearing action which avoids the propensity for such pellets to prevent the full closure of the non-return valve during the period of the cycle where a charge is injected into the mold cavities, and prior to forming of the next succeeding charge.

REFERENCES:
patent: 3131433 (1964-05-01), Volland
patent: 3698694 (1972-10-01), Zeug
patent: 3945786 (1976-03-01), Bishop
patent: 3946999 (1976-03-01), Nussbaumer

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