Process for flanging polytetrafluoroethylene pipes

Details Process for flanging polytetrafluoroethylene pipes Process for flanging polytetrafluoroethylene pipes

1974-09-30

1977-04-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264269, 264296, 264310, 264320, B29C 2716, B29D 300

Patent

active

040188639

ABSTRACT:
Polytetrafluoroethylene (PTFE) pipes, which may have a supporting metal mandrel placed therein, are flanged. To this end, use is made of a first implement which is a rigid annular plate having a frustoconical element and a bevelled cylindrical plug slightly smaller in diameter than the PTFE-pipe centrally mounted thereon. The first implement is heated once to 180.degree.-210.degree. C and forced into contact with the PTFE-pipe so that the plug opens thereinto. The PTFE-pipe and the first implement projecting thereinto are caused to rotate for 0.5-3 minutes at a speed of 5-10 rpm and under a contact pressure of 5-20 kg/cm.sup.2 of pipe surface area to be flanged whereby the free end of the PTFE-pipe is flared. The first implement is removed and replaced by a second implement which is a rigid annular plate having a bevelled cylindrical plug substantially equal in diameter with the PTFE-pipe centrally mounted thereon. The second implement is heated once to 180.degree.-210.degree. C and forced into contact with the PTFE-pipe. The PTFE-pipe and the second implement projecting thereinto are caused to rotate for 1-3 minutes at a speed of 5-15 rpm under a contact pressure of 5-20 kg/cm.sup.2 of pipe surface area to be flanged, and the flanged end of the PTFE-pipe is chilled by means of a coolant.

REFERENCES:
patent: 2608501 (1952-08-01), Kimble
patent: 3142868 (1964-08-01), Blount
patent: 3281512 (1966-10-01), Reiling
patent: 3293018 (1966-12-01), Doty
patent: 3435109 (1969-03-01), Flaming
patent: 3769393 (1973-10-01), Bjalme

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