抄録
The package enlargement and the increase of production speed have great advantages in the manufacture of highly twisted filament yarn. A new twisting system was proposed in this paper consisting of a flyerless twister containing a false twist spindle, a ring twister, a heater to set yarn and anoter false twist spindle (F2). This twisting system could produce highly twisted yarn without knots wound to a large package. The use of F2 was profitable to reduce the tension of the yarn on the heater. The snarl index of highly twisted yarn was also reduced when F2 was revolved faster than the ring twister spindle. The yarn, set to higher twisted state by F2 and untwisted to the final twist number, had lower torque than that of the yarn with the same twist level obtained by the system without F2. This procedure showed no effect on the twist contraction and heat shrinkage. By this twisting system, twisted yarn with the same level of snarl index as that of yarn produced by the system without F2 was obtainable at lower set temperature. The yarn of lower crystallinity was set to lower torque level, and the fineness of the obtained yarn increased owing to the large heat shrinkage.
