Process for flanging polytetrafluoroethylene pipes

Details Process for flanging polytetrafluoroethylene pipes Process for flanging polytetrafluoroethylene pipes

B - Operations, Transporting

29

C

18/937

B29C 57/12 (2006.01) B29C 57/00 (2006.01) B29C 35/02 (2006.01) B29C 35/16 (2006.01)

Patent

CA 1036307

PROCESS FOR FLANGING POLYTETRAFLUOROETHYLENE PIPES ABSTRACT OF THE DISCLOSURE: 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 smal- ler in diameter than the PTFE-pipe centrally mounted thereon. The first implement is heated once to 180- 210°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/cm2 of pipe sur- face area to be flanged whereby the free end of the PTFE-pipe is flared. m e first implement is removed and replaced by a second implement which is a rigid annular plate having a bevelled cylindrical plug sub- stantially equal in diameter with the PTFE-pipe cen- trally mounted thereon. The second implement is heat- ed once to 180-210°C and forced into contact with the PTFE-pipe. The PTFE-pipe and the second implement pro- jecting thereinto are caused to rotate for 1-3 minutes at a speed of 5-15 rpm under a contact pressure of 5- 20 kg/cm2 of pipe surface area to be flanged, and the flanged end of the PTFE-pipe is chilled by means of a coolant.

210655

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