Influence of yarn structure, sizing ingredients and type of sizing on properties and performance of sized yarns: Part I - Evaluation of sizing process using Zweigle G551 weavability tester

The average and minimum number of abrasion strokes to failure, rate of deterioration in tensile properties when subjected to simultaneous flexion and abrasion, and the effect of cyclic extension on sized yam strength at different size concentrations have been studied. It is observed that the number of abrasion strokes till break is higher in case of grey ring yam than that in case of the yams sized with thin boiling starch (TBS) because the fluff generated on the surface of the grey yam acts as a protective shield. The gain in strength after sizing is greater for rotor yams. However, the loss in strength after a fixed number of strokes is less for rotor yams than that for ring yams. Though the strength of the yams sized with TBS and PVA (both hot and cold brand) are not significantly different, the loss in strength after a fixed number of abrasion strokes is least for the cold brand PVA followed by the hot brand PVA and TBS.