Production of hardwearing and shock-resistant extrudates of ultr

Details Production of hardwearing and shock-resistant extrudates of ultr Production of hardwearing and shock-resistant extrudates of ultr

1990-05-09

1991-11-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421123, 425208, 4253781, B29C 4762

Patent

active

050630164

ABSTRACT:
For the production of extrudates of ultra-high molecular weight polyethylene, finely divided polyethylene or polyethylene powder is introduced into the cooled feed zone of a single-screw extruder and compressed therein, melted in a transport zone of the extruder and discharge with shaping of the extrudate and cooling. The polyethylene is processed in the transport zone using a velocity gradient of from 50 to 1,000 sec.sup.-1 in the radial play between the screw and the extruder barrel, heated to 180.degree.-280.degree. C. and then transferred to a screw-free zone in which final shaping of the extrudate is effected.

REFERENCES:
patent: 3026564 (1962-03-01), Kohlwey
patent: 3650652 (1972-03-01), Dray et al.
patent: 4249877 (1981-02-01), Machen
patent: 4518552 (1985-05-01), Matsuo et al.
patent: 4938908 (1990-07-01), Shiraki et al.

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