Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1994-07-22
1996-07-16
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
26421123, 264349, 425203, 425204, 425208, B29B 1110
Patent
active
055364624
ABSTRACT:
A process for the extrusion of rigid PVC profile other than pipe is disclosed in a twin conical screw extruder, equipped with high shear screws. The process includes extruding a compound specially adapted for the process, the compound contains a polyvinyl chloride resin with an average particle size of from 130 to about 200 microns, a lubricant system containing no more than about 3.5 parts of one or more lubricants, an organo metal salt, from 0 to less than 0.75 parts of a polymeric processing aid, at least one filler/pigment, and a stabilizer for PVC. The process achieves extrudate surfaces characterized by a smooth, dull finish. The process advantageously operates at high extrusion output rates under the conditions specified.
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Dearth Miles B.
The Geon Company
Thurlow Jeffery R.
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