The analysis of twist effect on the quality indicators of open-end spun yarn with cottonized flax fibers

The object of research is flax - cotton yarn with various twists of two linear densities obtained by the pneumomechanical method of formation. The aim of the work is to determine the rational values of the twist of flax - cotton yarn with linear densities of 50 tex and 110 tex, which ensures the best combination of quality indicators. The results of the studies showed that flax cotton yarn with a linear density of 50 tex (65 % cotton and 35 % cottonized flax fiber) and flax cotton yarn with a linear density of 110 tex (15 % cotton and 85 % cottonized flax fiber) have almost the same actual breaking characteristics when twisting from 700 twist/m to 1100 twist/m. The relative tensile load of yarn with a linear density of 50 tex is almost 2 times higher than that of a yarn with a linear density of 110 tex. An analysis of the values of the quadratic unevenness in linear density, in the number of thinning, thickenings, neps obtained with USTER TESTER 5 device showed that the optimal twist for a 50-tex linear density yarn is 800 twist/m, which corresponds to the actual twist of 736 twist/m for yarn with a linear density of 110 tex - 700 twist/m (actual twist - 656 twist/m). Yarns with a linear density of 50 tex are recommended to be used as warp and weft, with a linear density of 110 tex ued as a weft. A technique is proposed for determining the best sample of flax - cotton yarn based on a comprehensive analysis of its properties and quality indicators, determined using the USTER TESTER device.