PTFE tube

Details PTFE tube PTFE tube

2008-01-01

2008-01-01

Brinson, Patrick (Department: 3754)

Pipes and tubular conduits

Flexible

Corrugated

C138S122000, C138S177000, C264S286000

Reissue Patent

active

RE039968

ABSTRACT:
The present invention relates to a polytetrafluoroethylene (PTFE) tube, and more particularly to a PTFE tube for a flexible hose. In particular the invention relates to a PTFE tube having a smooth bore for use in the production of a lined hose assembly farther comprising hose braids, external hose protection and end fittings. The PTFE tube comprises external roots and peaks, which tube is obtainable from a non-convoluted tube having an original wall thickness W0and an internal diameter ID by a process in which a region of the tube is thinned to provide external convolutions with a root wall thickness W1characterised in that the convoluted PFTE tube has an improved resistance, of greater than 7.6%, to permeation by comparison with the non-convoluted tube, the comparison being made between tubes of (i) equal nominal bore ID; and (ii) equal weight of PTFE per unit length.

REFERENCES:
patent: 5476080 (1995-12-01), Brunnhofer
patent: 6056018 (2000-05-01), Renaud
patent: 6216743 (2001-04-01), Kosaki et al.
patent: 6250340 (2001-06-01), Jones et al.
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patent: 1543586 (1979-04-01), None
patent: 2 293 222 (1996-03-01), None
patent: 2293222 (1996-03-01), None

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