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US 2004/0170853 A1Published application
Dry fibrillated PTFE film and its method of manufacture
AssigneeTextiles Coated International
InventorStephen W. Tippett
Life of this patent
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Abstract
A finished PTFE film is produced by first preparing an extruded, dried, unsintered and unexpanded PTFE feed film, and then reducing the thickness of the feed film by more than 20% by passing it with back tension through a roll nip.
Claims10
A method of producing a finished PTFE film, comprising:
- a) preparing an extruded, dried, unsintered and unexpanded PTFE feed film;
- and
- b) reducing the thickness of said feed film by more than 20% by passing said feed film with back tension through a roll nip.
Dependencies are inferred from the claim text.