Process for the production of string-like porous material

Details Process for the production of string-like porous material Process for the production of string-like porous material

C - Chemistry, Metallurgy

08

J

18/15

C08J 9/24 (2006.01) B29C 67/20 (2006.01) D01D 5/16 (2006.01) D01D 5/24 (2006.01) D01F 6/12 (2006.01)

Patent

CA 1192361

ABSTRACT OF THE DISCLOSURE A process for producing a tube or rod of a poly- tetrafluoroethylene is described. The process comprises molding a polytetrafluoroethylene containing a liquid lubri- cant into a tube or rod by a paste process, removing the liquid lubricant, stretching the tube or rod in the length- wise direction, and thereafter, by sintering the stretched tube or rod at a temperature of at least 327°C wherein the stretching of the tube or rod is carried out by the use of at least one pair of heating rolls which are each provided with a plurality of grooves. The process provide uniform stretching making it possible to produce a tube or rod with very small internal diameter.

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