| 摘要 |
PCT No. PCT/FR92/00560 Sec. 371 Date Dec. 21, 1993 Sec. 102(e) Date Dec. 21, 1993 PCT Filed Jun. 19, 1992 PCT Pub. No. WO93/00213 PCT Pub. Date Jan. 7, 1993.A method of manufacturing a PTFE tape whose density is less than or equal to 0.3 g/cm3, the method being characterized in that a raw PTFE tape is subjected to a first step of stretching while being heated so as to reduce its density to within the range 0.7 g/cm3 to 0.30 g/cm3, after which at least one step is performed of the type including a stage during which the tape is stabilized without changing the state of the PTFE by being passed through an oven at a temperature and for a duration that are functions of the mass to be stabilized while keeping the tape under tension so that its density does not increase, followed by a stage of stretching under heating so that the density of the tape reaches a value lying in the range 0.2 g/cm3 to 0.12 g/cm3.
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