Patent ID: 8316629

Claim:
A polytetrafluoroethylene (PTFE) real twist yarn, wherein the PTFE real twist yarn is obtained by twisting a PTFE multi-filament slit yarn, which comprises a plurality of filaments, wherein the PTFE real twist yarn has a circular cross-section with a circularity in a range of 10/8 to 10/10, where the circularity is expressed by a ratio between a major axis width and a minor axis width of the cross-section, an average fineness of the filaments is in a range of 1.5 to 200 dtex, a fineness D of the PTFE real twist yarn is in a range of 50 to 6000 dtex, and a twist coefficient K of the PTFE real twist yarn expressed by Formula (1) is in a range of 10000 to 35000: twist coefficient K =number of twists T ×(the fineness D of the PTFE real twist yarn) 1/2 (1) where the number of twists T denotes the number of twists per meter of the PTFE multi-filament slit yarn, and the fineness D is a total fineness thereof, and a number of the filaments in the PTFE multi-filament slit yarn is in a range of 10 to 200.