Screw tip of an extruder screw

Details Screw tip of an extruder screw Screw tip of an extruder screw

1988-07-18

1989-09-05

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within pressurizing chamber

26421121, 26421123, 366 80, B29C 4764

Patent

active

048633640

ABSTRACT:
An extruder for the extrusion of a material composed of a mixture of substances in which an extruder screw is rotatably mounted in a feed channel of a housing for advancing the material to an outlet, of the channel whereat a screw tip is coaxially mounted on the extruder screw and is disposed with clearance in a distributor channel extending in prolongation of the feed channel to receive the material from the extruder screw and feed the material to a discharge outlet of the distributor channel. The screw tip has a discharge surface at an end thereof remote from the extruder screw, which includes a plurality of surface portions ascending generally helically in the direction of flow of the material. The surface portions can be flat or form a continuous discharge surface. A conveyor channel for material is formed in the screw tip and extends over an angular portion of the screw tip from a radial discharge edge of the discharge surface so that the conveyor channel is entirely open at the outer periphery of the screw tip.

REFERENCES:
patent: 3335461 (1967-08-01), Schwartz
patent: 3942774 (1976-03-01), Sokolow
patent: 4112516 (1978-09-01), Hotz
patent: 4124347 (1978-11-01), Miller
patent: 4218146 (1980-08-01), Housz
Schenkel, G.; Kunststoff-Extrudertechnik; Published by Carl Hanser Verlag; Munich, 1963; pp. 236, 237.

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