TENSION GENERATED IN HARD TWIST FILAMENT YARN BY TWO-FOR-ONE TWISTER

Abstract

A two-for-one twister has many advantages of high productivity and fast operation. However, it is said that the twister of this type imposes high tension on the filament twisted. We studied factors affecting tension during twisting by two-for-one twisters. The results are;(1) Twisting tension T0 can be expressed by the following equation. gf/den where dm is the nominal denier, e is the twist contraction, ω is the angular velocities of the spindle, b is the radius of the upper edge of conical spindle disk, and l/b is obtained from the relation among air-drag (K), linear density (m) and radius of spindle disk (b).(2) Twisting tension increases in proportion to square of the revolution velocity of spindle.(3) The yarn of large linear density is subjected to high twisting tension because of large l/b.(4) When e increases with the twist number, the yarn tension increases because of increase in linear density of the ballooned yarn.(5) The storage disc automatically controls the taking off point of the yarn close to the upper edge of the disc.