Process and extrusion press for making hollow body made of fluor

Details Process and extrusion press for making hollow body made of fluor Process and extrusion press for making hollow body made of fluor

1994-09-20

1996-05-21

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

2642098, 264323, 425380, 425393, 425467, B29C 4720

Patent

active

055186769

ABSTRACT:
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.

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