Process for forming a seamless tube of expanded PTFE from a sheet of expanded PTFE
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United States of America Patent
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Apr 11, 2000
Issued Date -
N/A
app pub date -
Nov 1, 1996
filing date -
Aug 18, 1993
priority date (Note) -
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Abstract
A method of making a seamless, thinwall tube of porous polytetrafluoroethylene. The method involves the use of corresponding male and female dies to deform a precursor sheet of porous PTFE which has been restrained about its perimeter. Preferably the porous PTFE sheet is heated to a temperature of less than the crystalline melt temperature during the tube-forming process. The precursor material is preferably a sheet of porous expanded PTFE and more preferably a multiaxially expanded sheet. This precursor material may optionally have been previously exposed to heat above the melt temperature of PTFE. The inventive tube is as thin or thinner than the precursor sheet.
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