The Effect of the Structure on the Mechanical Properties of the Modacrylic/Cotton Blended Yarn

The breaking strength and breaking elongation of 18 varieties of modacrylic/cotton blended yarns with three twist factors,six blending ratios were tested,and the effect of the blending ratio and the twist factor on the mechanical properties of the blended yarns were discussed.The result showed that as the content of modacrylic fibers in the blended yarns increased,the breaking strength decreased at first and then increased,and there was a blending ratio at which the yarn had the minimum breaking strength.When smaller than this blending ratio,the breaking elongation of the blended yarn was low and uniform,however,when larger than this blending ratio,it had a sharp increase with increased content of modacrylic fibers in the blended yarns.As the twist factor increased,the breaking strength increased when smaller than the blending ratio at the minimum strength and decreased when larger than the ratio.The breaking elongation decreased with the increase of the twist factor at the same blending ratio.