Influence of spinning parameters on mechanical properties of silk/spandex covered yarn
The study of the relationship between spinning parameters and mechanical properties of covered yarn is the basis for precise regulation of garment pressure.L9(34)orthogonal tests were designed to study the influence of spinning parameters(twist ratio,internal twist,stretch ratio)on mechanical indexes(stress relaxation rate,elastic recovery rate,breaking strength)and to select the optimal combination.The relationship between spinning parameters and yarn modulus was analyzed by quadratic general rotation combination design.A mathematical prediction model was established.The results show that the factors affecting stress relaxation rate and breaking strength are twist ratio>internal twist>stretch ratio in order;the factors affecting elastic recovery rate are stretch ratio>internal twist>twist ratio in order.The ranking scoring method resulted in the best overall performance of the yarn with a stretch ratio of 2.8,an internal twist of 1 600 twist/m and a twist ratio of 70%.The initial modulus decreases and then increases with the increase of twist and stretch ratio,and increases with the increase of twist ratio.The tensile modulus decreases and then increases with the increase of stretch ratio,and increases with the increase of internal twist and twist ratio.
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