05518676 is referenced by 10 patents and cites 23 patents.

The invention relates to a hollow body made of fluoro resin, especially of PTFE, obtained by paste extrusion, exhibiting an anisotropy ratio lower than 1 and substantially equal to 0.5. For the manufacture of such hollow bodies a fluoro resin powder, especially unsintered PTFE, is mixed with lubricant, the mixture is compressed to obtain an isotropic compact tubular preform, the preform is introduced into an extrusion press, the preform is expelled through a passage of small cross-section of a die so as to form lengthwise-oriented fibers, the fibers are compressed at the exit of the passage in an internal expansion chamber of enlarged cross-section, so as to orient the fibers transversely, and the fibers are expelled through the exit orifice of the die to obtain a hollow body.

Title
Process and extrusion press for making hollow body made of fluoro resin
Application Number
8/309131
Publication Number
5518676
Application Date
September 20, 1994
Publication Date
May 21, 1996
Inventor
Bernard M de Rocheprise
Chalindrey
FR
Agent
Oliff & Berridge
Assignee
Compagnie Plastic Omnium
FR
IPC
B29C 47/20
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