Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1996-11-01
2000-04-11
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
26433114, B29C 5104
Patent
active
060484845
ABSTRACT:
A method of making a seamless, thinwall tube of porous polytetrafluoroethylene. The method involves the use of corresponding male and female dies to deform a precursor sheet of porous PTFE which has been restrained about its perimeter. Preferably the porous PTFE sheet is heated to a temperature of less than the crystalline melt temperature during the tube-forming process. The precursor material is preferably a sheet of porous expanded PTFE and more preferably a multiaxially expanded sheet. This precursor material may optionally have been previously exposed to heat above the melt temperature of PTFE. The inventive tube is as thin or thinner than the precursor sheet.
REFERENCES:
patent: 2781552 (1957-02-01), Gray
patent: 3953566 (1976-04-01), Gore
patent: 4187390 (1980-02-01), Gore
patent: 4203938 (1980-05-01), Burnett et al.
patent: 4419320 (1983-12-01), Perkins et al.
patent: 4482516 (1984-11-01), Bowman et al.
patent: 4563325 (1986-01-01), Coffman
patent: 4877661 (1989-10-01), House et al.
patent: 4957669 (1990-09-01), Primm
patent: 5026513 (1991-06-01), House et al.
patent: 5466509 (1995-11-01), Kowligi et al.
patent: 5620763 (1997-04-01), House et al.
House Wayne D.
Moll Kenneth W.
Zukowski Stanislaw L.
Eashoo Mark
Heitbrink Jill L.
House Wayne D
W. L. Gore & Associates, Inc.
LandOfFree
Process for forming a seamless tube of expanded PTFE from a shee does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for forming a seamless tube of expanded PTFE from a shee, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for forming a seamless tube of expanded PTFE from a shee will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1174259