Process for extruding polymers

Details Process for extruding polymers Process for extruding polymers

B - Operations, Transporting

29

C

18/795

B29C 47/94 (2006.01) B29C 47/12 (2006.01) B29C 47/30 (2006.01)

Patent

CA 1226712

TITLE PROCESS FOR EXTRUDING POLYMERS ABSTRACT OF THE DISCLOSURE Making polymeric extrudates having a smooth surface by feeding a molten polymeric core material through a die cavity wherein a portion of the wall of the die cavity is a rigid microporous structure located upstream from a narrowed flow passage of the die cavity, the microporous structure having a substantially uniform pore size, simultaneously forcing under pressure through the microporous structure about 0.03-10%, based on the total weight of the extrudate, of a low viscosity liquid to form a sheath on the molten polymeric core material thus displacing the polymeric core material before the resulting sheath-core composite enters the narrowed flow passage of the die cavity said process conducted under conditions to produce a pressure drop across the microporous structure of at least 0.10 MPa more than the pressure applied on the polymeric core material.

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