Agitating – Rubber or heavy plastic working – With specified vent means
Patent
1981-05-12
1983-05-17
Wilhite, Billy J.
Agitating
Rubber or heavy plastic working
With specified vent means
366 76, 366 77, 366 88, 366 89, B43K 2108
Patent
active
043837646
ABSTRACT:
An apparatus for continuous extrusion of a material including a hollow barrel with inner liner having a cylindrical chamber portion and an outwardly divergent, coaxial frusto-conical outlet chamber portion adjacent thereto so that reverse pressure developed by extrusion of the material results in sealing engagement of the frusto-conical screw and barrel portions thereby effectively preventing regurgitation of the material. A fluted screw is rotatably positioned coaxially within the barrel and liner, and has both cylindrical and outwardly divergent outer thread surface portions conforming to the inner surface of the cylindrical and the frusto-conical chamber portions, respectively, of the barrel and liner. Rotation of the screw forces the material to flow axially through the barrel along the threads of the screw toward the outlet chamber portion and through an extrusion die. Resistance of the die to the flow of material results in a force in the reverse direction being exerted on the threads of the frusto-conical chamber portion establishing an effective, fluid-tight seal to prevent reverse flow or regurgitation of the material between the screw and the barrel liner.
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Dahlberg Arthur D.
Wilhite Billy J.
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