Extrusion method

Details Extrusion method Extrusion method

1994-02-02

1995-08-01

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264148, 264211, 26421123, 264349, 366 85, 366 88, 425203, 425204, B29B 784, B29C 4776

Patent

active

054378265

ABSTRACT:
A method of extruding a substantially uniform polymer composition made up of polyvinylchloride, a stabilizing additive composition and at least one of two additional constituents, one of which is a mineral filler and the other of which is a normally liquid plasticizer for the polyvinylchloride; the method is achieved while avoiding use of compounded PVC as a starting material and includes the steps of: (I) providing an extruder; (II) operating the rotors of the extruder for essentially synchronous rotation in a common direction while maintaining in the extruder cavity a temperature sufficient to plasticize the polyvinylchloride; (III) feeding particulate polyvinylchloride and the additive composition without substantial premixing of the polyvinylchloride and the additive composition into the cavity at the first inlet (e.g. a conventional common hopper) provided near the drive end and adjacent a first conveying segment portion of the rotors; (IV) introducing at least one of the additional constituents through at least one second inlet provided downstream of the first inlet adjacent a rotor section downstream of the first conveying section and downstream of at least one kneading segment section; and thereafter (V) degassing the mixture and extruding it through the extrusion die end.

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Twin Screw Extruder--A Separate Breed, Martelli, SPE Journal, Jan. 1971--vol. 27, pp. 25-30.

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