D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
D02G1/04—Devices for imparting false twist
D02G1/08—Rollers or other friction causing elements