Method for extrusion of powered PVC compounds

Details Method for extrusion of powered PVC compounds Method for extrusion of powered PVC compounds

1992-08-17

1993-03-30

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

To form particulate product

2641771, 26421121, 26421123, 264349, 425204, B29B 1110

Patent

active

051981700

ABSTRACT:
This invention discloses an improved method for powder PVC extrusion using particulate PVC resin specified herein which enables smooth, dull surfaces for extrudates under broad processing conditions, in particular at relatively lower shear and temperature. The resins are characterized as having an average particle size ranging from 50 to 125 microns, a DOP porosity of from about 0.27 cc/gm to about 0.5 cc/gm, and a friability rating of 5 or less, preferably 2 or less depending on the stock temperature range during extrusion.

REFERENCES:
patent: 3374296 (1968-03-01), Janeschitz-Kriegl et al.
patent: 3884607 (1975-05-01), Gerhards
patent: 4243629 (1981-01-01), Tramezzani
patent: 4446086 (1984-05-01), Molenaar et al.
patent: 4871498 (1989-10-01), Nakamura et al.
patent: 4889673 (1989-12-01), Takimoto
Encyclopedia of PVC, vol. 1, p. 200.

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