Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Autogenously or by activation of dry coated particles
Patent
1990-03-26
1992-12-01
Lesmes, George F.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Autogenously or by activation of dry coated particles
264175, 2642102, 2642888, 2642902, B29C 6720, D01F 208, D01D 512, D02J 122
Patent
active
051678900
ABSTRACT:
To produce a monoaxially stretched shaped article of polytetrafluoroethylene (PTFE), a pasty mass containing PTFE powder is continuously shaped to a shaped body, which is fed over a plurality of rollers or rolls, heated and stretched. The shaped body is heated to a temperature of between 327.degree. and 450.degree. C. prior to stretching strain, it is sintered simultaneously and is then stretched. This process allows for the production of a monoaxially stretched shaped article of PTFE which has strength values in the stretching direction of at least 500 N/mm.sup.2 and a delivery of between 1.80 and 2.30 g/cm.sup.3.
REFERENCES:
patent: 3953566 (1976-04-01), Gore
patent: 4707314 (1987-11-01), Kawahigashi et al.
patent: 4710331 (1987-12-01), Nobuo et al.
Reinmuller Reinhard
Sasshofer Franz
Schlossnikl Christian H. F.
Wimmer Adalbert G.
Lenzing Aktiengesellschaft
Lesmes George F.
Shelborne Kathryne E.
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