Process of paste extrusion
Pipes with walls thicker than 4 mm are made by paste extrusion of PTFE powder in the presence of a lubricant. The extrusion is carried out at a reduction ratio below 20:1. The PTFE powder is a mixture of 80 to 99% by weight of coagulated dispersion grade PTFE and 20 to 1% by weight of PTFE having a median particle size less than 50 micrometers. The mixture is preferably a co-coagulation of the two forms of PTFE.
Description
Patent History
Patent number: T101402
Type: Grant
Filed: Oct 29, 1980
Date of Patent: Jan 5, 1982
Inventor: Jeffrey R. Pateman (Welwyn Garden City, Hertfordshire)
Application Number: 6/201,974
Type: Grant
Filed: Oct 29, 1980
Date of Patent: Jan 5, 1982
Inventor: Jeffrey R. Pateman (Welwyn Garden City, Hertfordshire)
Application Number: 6/201,974
Classifications
