Method and apparatus for forming elongate ptfe material and...

Details Method and apparatus for forming elongate ptfe material and... Method and apparatus for forming elongate ptfe material and...

B - Operations, Transporting

29

C

B29C 55/06 (2006.01) A61C 15/04 (2006.01)

Patent

CA 2517368

An elongate PTFE material is formed by passing an unsintered PTFE tape across a heated surface in sliding contact therewith while applying tension to the tape, such that the PTFE tape, when its temperature is raised by contact with the heated surface (8), is longitudinally stretched with simultaneous width and thickness reduction while in contact with the surface. PTFE tapes having different properties, e.g., coefficients of friction at opposite faces can be produced. Such tapes are suitable for use as dental flosses.

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