Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Autogenously or by activation of dry coated particles
Patent
1995-05-02
1996-09-03
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Autogenously or by activation of dry coated particles
2642107, 2642888, B29C 5510
Patent
active
055521002
ABSTRACT:
A method for preparing thin fluoropolymer (PTFE) films, said method generally having the steps of: a) providing an unsintered fluoropolymer film; b) pre-sintering expansion of the film; c) sintering the expanded film with dimensional restraint to prevent shrinkage; and d) post-sintering stretching of the film to a final thickness preferably less than 0.002 inches. The post-sintering stretching of the film in step d may be accomplished in a single step, or may include a series of post-sintering stretching steps. Steps b and c of the method may be carried out bypassing the calendared film through a machine direction orienter device and, thereafter, step d of the method may be accomplished by subsequently repassing the sintered film through the machine direction orienter device, one or more additional times.
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Kuo Chris
McCollam Chris
Peterson Robert
Shannon Donald
Baxter International Inc.
Sun Raymond
Thurlow Jeffery R.
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