Porous ptfe

Details Porous ptfe Porous ptfe

B - Operations, Transporting

29

C

18/30

B29C 67/04 (2006.01) B29C 44/44 (2006.01) B29C 67/20 (2006.01)

Patent

CA 1318090

ABSTRACT OF THE DISCLOSURE A substantially cylindrical bar of microporous PTFE is non-fibrillated and incorporates pores within any cylindrical surface within the bar centred about the central longitudinal axis of the bar that are of substantially uniform size and are substantially uniformly distributed within that surface. The process for producing such a bar includes the step of applying a substantially radial compressive force to pre-heated and cooled granules of PTFE and subsequently re-heating and cooled the compressed granules, while a film of non-fibrillated, microporous PTFE is formed from the cooled bar, the plane of the film being perpendicular to the direction of the radial compressive force whereby the pores within any plane substantially perpendicular to the thickness of the film are of substantially uniform size and are substantially uniformly distributed within that plane and all such parallel planes. 1.

538181

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