Structure-Property Relationship of Blended Cotton Yarns Made from Low and High Tenacity Fibers

Abstract

The tensile response of staple yams is usually determined by their structure and the mechanical properties of their constituent fibers. Yarn structure is influenced by the radial disposition of fibers along the yam length, commonly known as migration, and the packing density of the fibers in the yarn cross section. These, in turn, are affected by fiber properties, yarn factors, and the dynamics of preparatory and spinning pro cesses. Yarn structure development is further complicated when the yarn is spun from blends of different fiber types because the blending method usually profoundly influ ences the position and orientation of the fibers in the yam matrix. This investigation is concerned with the effect of fiber properties and yarn structure on the tensile properties of ring spun yarns made from a 50:50 blend of high (Pima) and low (Upland) tenacity cotton fibers spun using intimate and drawframe blending techniques. The drawframe blended yarn in this work is produced by arranging all high tenacity fiber slivers in the center of the drawframe creel to determine if preferential positioning in the core of the yam helps to improve the strength of drawframe blended yarn compared with intimate blended yarns. The findings reveal that intimate blended yam has better tensile strength than drawframe blended yarn, even though more high strength Pima cotton fibers are positioned in the core of the yam. This is because non-uniform fiber distribution re sulting from blending of different fibers affects the migratory behavior of fibers. The tensile failure of such yams is governed by the mode of fiber breakage and fiber slippage as determined by the yarn structure—fiber distribution and migration—rather than predominantly by fiber breakage compared with strength.

Effects of Blending Parameters on the Cross-section Fiber Migration of Silk/Cotton Blends

“…It followed that for all our yarns, there was no difference in the fiber compactness in different zones. This result did not agree with previous reports [2,22,25,26], where it was observed that the distribution of fiber packing followed a trend of maximum number of fibers in the center and decreasing to reach the minimum number at the outside periphery. The zoning and cutting method differences may explain this result.…”

“…The migration tendencies according to the blending type (intimate or drawframe) showed similar results to a previous study by Anandjiwala et al [2]. Also, the results presented here confirmed previous results [7] concerning the effects of the fiber characteristics on the fiber distributions in the yarn cross-section, as well as on the migration tendency.…”

Effect of fiber length and blending method on the tensile properties of ring spun chitosan–cotton blend yarns

“…On the other hand, the sliverblending method could be an alternative means to manipulate the migration of chitosan fibers in blended yarns. 37 In this case, the cotton fibers in sliver-blended yarns have the tendency to migrate into the core area of the yarn structure, as opposed to cotton fibers in fiber blended yarns.…”

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“…However, Nawaz [10] concluded that the gradual decrease in yarn strength occurs as the share of polyester fibers in the blend decreases. Anandjiwal & Goswami [11] suggested that blending dissimilar fibers lead to their non-uniform distribution throughout the yarn cross section, which in turn, lead to preferential migration depending on both fiber properties and mechanism of spinning process adopted. Therefore, the present study was carried out to figure out the effect of polyester/cotton blend ratio on quality characteristics of resultant yarn.…”