Effect of Ring Machine Front Roller Rubber Cot Hardness on Properties of Coarser Yarn

The hardness of the rubber cot is one of the most important factors that influences the properties of spun cotton yarn. Four different 100% coarse count cotton yarns (Ne 10/1, Ne 12/1, Ne 14/1, andNe 16/1) were spun with various front roller rubber cot hardness from 65°, 68°, 70°, 75 °, and 83° shore hardness with constant back cot roller shore hardness. Cotton yarn properties were investigated, including mass uniformity, imperfection level, unevenness, hairiness, tensile strength, and elongation. The results showed that as the shore hardness increased, the unevenness of mass and imperfection index of the yarns proportionally increased. It does not apparently influence the yarns’ hairiness, tensile strength, or elongation properties.