MECHANICAL AND PHYSICAL PERFORMANCE ANALYSIS OF POLYESTER/MODAL BLENDED YARNS PRODUCED BY RING AND COMPACT SPINNING SYSTEMS
Prakash Chandra Birla
Assistant Professor, Department of Textile Technology M. L. V. Textile & Engineering College, Bhilwara, Rajasthan
Syed Abdul Adil
Department of Textile Technology M. L. V. Textile & Engineering College, Bhilwara, Rajasthan
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This study systematically investigates the influence of fibre composition and tex twist factor on the mechanical and physical properties of polyester/modal blended yarns produced using conventional ring and compact spinning systems. Polyester and modal fibres were blended in three proportions (70/30, 50/50, and 30/70) and spun into 19.6 tex yarns at three tex twist factors (28.71, 33.50, and 38.28). The yarns were evaluated for tensile properties, mass irregularity, imperfections, hairiness, diameter, and shrinkage. The results demonstrate that both blend ratio and twist factor significantly affect yarn performance. Compact-spun yarns consistently exhibited superior mechanical and physical properties compared to conventional ring-spun yarns, primarily due to improved fibre alignment, higher packing density, and reduced spinning triangle. Yarn tenacity increased with twist factor up to an optimum level, beyond which further twist insertion led to a reduction in strength due to increased fibre obliquity and structural rigidity. Increasing modal content in the blend adversely affected tensile strength, uniformity, and overall yarn quality in both spinning systems, whereas higher polyester proportions enhanced strength and dimensional stability. Overall, polyester-rich compact-spun yarns produced at optimal twist levels demonstrated the most favourable balance of strength, uniformity, and structural compactness.
Keywords: Polyester; Modal; Ring Spinning; Compact Spinning; Blend Ratio; Twist Factor
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