Textured, porous, expanded ptfe

Details Textured, porous, expanded ptfe Textured, porous, expanded ptfe

C - Chemistry, Metallurgy

08

J

C08J 9/36 (2006.01) A61F 2/06 (2006.01) B29C 44/56 (2006.01) B29C 47/00 (2006.01) B29C 55/00 (2006.01) B29C 55/22 (2006.01) B32B 5/18 (2006.01) B29C 59/04 (2006.01)

Patent

CA 2154061

A more porous PTFE is obtained by impressing a pattern into extruded PTFE and then expanding the PTFE. The pattern can be impressed by knurling or, preferably, by rolling the sheet between rollers having a pseudo-random pattern formed on the surface of the roller. The uniformity of the pores is controlled by the pattern; viz. a coarse pattern produces a wider distribution of internodal distances than a finer pattern.

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