Mixer for plastic injection molding machine

Details Mixer for plastic injection molding machine Mixer for plastic injection molding machine

1974-08-14

1976-02-03

Hornsby, Harvey C.

B29F 104

Patent

active

039360385

ABSTRACT:
A rotating feed screw in the barrel of an injection molding machine is fitted with a collar with peripheral grooves through which the plasticized material is fed into a charge forming chamber. The collar is held onto the end of the feed screw by an elongated torpedo body, which body has a first portion for receiving the annular collar, a second portion which defines a plurality of helically oriented crisscrossing grooves in its cylindrical surface, and a third axial portion which defines a raceway for a plurality of spherical roller elements. A nonreturn valve in the form of an annular shuttle is slidably received on the second axial portion, and also slidably received in the bore which rotatably receives the screw, so that the plasticized material is required to pass through the above mentioned grooves and around the ball elements. Thus, the ingredients are mixed in several stages prior to being injected through a nozzle provided in the head of the barrel, into the mold cavity.

REFERENCES:
patent: 2669750 (1954-02-01), Keeney
patent: 2764781 (1956-10-01), Kelly
patent: 3131433 (1964-05-01), Volland
patent: 3175248 (1965-03-01), Swenson
patent: 3319299 (1967-05-01), Kiraly
patent: 3710988 (1973-01-01), Moslo
patent: 3826477 (1974-07-01), Kunogi

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