Haque MM and Maruf NH
The paper provides comparison of properties of 100% cotton yarn with those of two cotton-polyester blended yarns of 50/50 and 20/80 blend ratios. In this regard three types of yarns (i.e. 100% cotton, 50/50 and 20/80 cottonpolyester blends) were produced in the ring frame and for each type two different counts (30 Ne and 40 Ne) were produced. The blending was carried out in the draw frame. During processing, the settings and parameters e.g. spindle speed and twist multiplier were adjusted for optimum performance. After production at each stage (i.e. D/F, Simplex and Ring) samples of draw frame slivers, rovings and yarns were collected and investigated. The properties that were investigated were count, yarn faults, yarn irregularity as U% and strength as CSP. The study shows that, in ring frame it was possible to maintain higher spindle speed and lower twist multiplier for 50/50 and 20/80 blended yarns than 100% cotton yarn. Between 50/50 and 20/80 blended yarns, it possible to maintain higher spindle speed and lower twist multiplier for 20/80 blend than 50/50 bend. It was observed in all cases that as the percentage of polyester increase the U% i.e. the irregularity in the sliver/yarn decreases. It was also observed that yarn faults (IPI) decreased with the increase of % of polyester in the yarns. The yarn strength of 50/50 and 20/80 blended yarns was higher than that of 100% cotton and strength of 20/80 was higher than that 50/50 blended yarn.
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