Method and apparatus for extruding foam polymeric materials invo

Details Method and apparatus for extruding foam polymeric materials invo Method and apparatus for extruding foam polymeric materials invo

1981-06-17

1983-08-30

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG5, 366319, 366323, 366324, 425208, 425209, 425817C, 521145, B29D 2700, B29F 302

Patent

active

044016123

ABSTRACT:
Cellular chlorinated polyvinyl chloride resin is made in an extruder that is characterized by a combination of multiple flights and a plurality of open slots in the mixing section to facilitate mixing of the resin and a blowing agent whereby a rigid thermoplastic cellular product of low density is made that has a predominantly closed cell structure.

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