Textured, porous, expanded PTFE

Details Textured, porous, expanded PTFE Textured, porous, expanded PTFE

1993-01-15

1995-11-14

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428152, 4283044, 4283157, 428422, 428543, B32B 2716

Patent

active

054665094

ABSTRACT:
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.

REFERENCES:
patent: 3833455 (1974-09-01), Rosenblatt et al.
patent: 4187390 (1980-02-01), Gore
patent: 4344996 (1982-08-01), Banks et al.
patent: 4374690 (1983-02-01), Canterino et al.
patent: 5066565 (1991-11-01), Martinez et al.
patent: 5071609 (1991-12-01), Tu et al.

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