Extruder with screw having core portion of polygonal cross-secti

Details Extruder with screw having core portion of polygonal cross-secti Extruder with screw having core portion of polygonal cross-secti

1986-06-12

1987-12-15

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within pressurizing chamber

26421121, 26421123, 264349, 366 79, 366 87, 425209, B29C 4760

Patent

active

047129921

ABSTRACT:
A screw for use in an extruder barrel for plasticizing plastic material from a solid phase to a viscous form wherein the feed screw has a cylindrical core with a helical flight extending for the full length of the screw. A selected portion or portions of the screw's core has a polygonal cross section whose apexes are parallel to the axis of rotation of such screws to thereby more precisely control the plasticizing action of the plastic material, its viscosity and temperature while providing a thoroughly mixed and homogeneous melt.

REFERENCES:
patent: 3235640 (1966-02-01), Carton et al.
patent: 3467743 (1969-09-01), Otani
patent: 3511479 (1970-05-01), Hendry
patent: 3661363 (1972-05-01), Aletti
patent: 3954366 (1976-05-01), Fields

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