EFFECT OF SHADE DEPTH (%) AND RING FRAME PROCESS PARAMETERS ON COTTON-VISCOSE BLENDED MÉLANGE YARN QUALITY

Demand for mélange yarns is increasing day by day because of its special colour appearance and environmental friendly spinning technology associated with it. In the present work, an investigation has been made to study the effect of important spinning process variables namely shade depth, ring frame spindle speed and yarn twist multiplier (TM) on various yarn quality parameters like unevenness, strength, imperfection, Breaking extension, yarn CSP, hairiness index and yarn specific volume of Ne 30s cotton/viscose blended mélange yarn. It has been found that yarn qualities like tenacity, breaking extension (%) deteriorates and hairiness index, imperfections increases for higher shade depth (%) and production speed. Yarn specific volume increases with the increase in shade depth (%) of yarn and with the increase in ring frame spindle speed specific volume decreases. Deterioration in mélange yarn quality with the increase in black viscose fibre content in the yarn can be explained by the deterioration of fibre strength aft er dyeing and generation of weak and short fibres when the dyed fibres are processed in blow room and card.