Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1994-07-27
1995-08-08
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
425208, 425562, 425563, 366 78, 366 81, 366 77, B29B 714, B29C 4552
Patent
active
054396336
ABSTRACT:
An apparatus and method for controlling thermoplastic mixing in a plastic extrusion machines used for injection molding, blow molding or other reciprocating molding process. The plastic extruder having a rotating helical screw within a cylindrical shell with an automatic shut-off and mixing valve secured to the helical screw at the downstream end of the screw. The automatic shut-off and mixing valve includes a unitary valve body with a poppet. A plurality of mixing groove pairs are arranged extending substantially longitudinally on the surface of the valve body. Select angular bores extend from the groove pairs to the poppet. The poppet is axially movable within and rotatable relative the valve body. The poppet has an axial stem extending into a longitudinal axial bore within the valve body. An elastic means is positioned on the rearward end of the poppet maintaining the valve in a normally closed position against a seating surface of the valve body when there is no rotation of the helical screw.
REFERENCES:
patent: 3002229 (1961-10-01), Friederich
patent: 3401426 (1966-05-01), Evans
patent: 3486192 (1969-12-01), LeRoy
patent: 3590439 (1971-07-01), Swanson
patent: 3728053 (1973-04-01), Stillhard et al.
patent: 3756574 (1973-09-01), Maddock
patent: 4169679 (1979-10-01), Miller et al.
patent: 4302409 (1981-11-01), Miller et al.
patent: 4427361 (1984-01-01), Saito
patent: 4512733 (1985-04-01), Eichlseder et al.
patent: 4530605 (1985-07-01), Eichlseder et al.
patent: 4681528 (1987-07-01), Maruyama
patent: 4752136 (1988-06-01), Colby
patent: 4850851 (1989-07-01), Dinerman
patent: 5002717 (1991-03-01), Taniguchi
patent: 5071256 (1991-12-01), Smith et al.
patent: 5098267 (1992-03-01), Cheng
patent: 5164207 (1992-11-01), Durina
Bodnar Shawn P.
Durina Michael F.
Womer Timothy W.
Heitbrink Jill L.
Herberger Robert J.
Spirex Corporation
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