Plastic extrusion and apparatus

Details Plastic extrusion and apparatus Plastic extrusion and apparatus

1977-07-11

1978-10-03

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

366 88, 366169, 425205, 425208, 425379R, B29F 306

Patent

active

041181638

ABSTRACT:
Disclosed is a screw extruder apparatus, having passages to drain melt as formed into a central bore of the screw, which is physically separated by seal means into a first zone on the feed side advancing plastic toward said seal and a second zone on the opposite side of said seal means into which drained melt passes from the bore and is pumped back toward said seal and out a lateral exit orifice adjacent said seal means. The temperature of the melt in the second zone can be independently controlled. In one embodiment means are provided to maintain an essentially constant pressure in said second zone.

REFERENCES:
patent: 3137035 (1964-06-01), Hendry
patent: 3632256 (1972-01-01), Kasting et al.
patent: 3712594 (1973-01-01), Schippers et al.

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