Textured, porous, expanded PTFE

摘要

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 the 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.