纬平棉针织物双向拉伸线圈形态分析

Shape analysis of biaxial stretching coil of weft plain knitted cotton fabric

针对纬平针织物在平幅丝光过程中线圈拉伸易变形的问题,对丝光前纬平棉针织物进行了双向拉伸,研究不同拉伸条件下线圈形态变化规律,同时采用网格法将织物分成不同的单元,分析双向拉伸条件下不同单元的位移矢量、圈距、圈高、形态系数、剪切角等结构参数沿拉伸方向的变化规律。结果表明:织物形变较小的区域呈椭圆形,且随着拉伸张力的增加,椭圆区域面积逐渐变小,圈距和圈高均符合抛物线的变化规律,形态系数呈周期性梯度分布,线圈最大剪切角变小,且所有剪切角减小的趋势变缓。

In view of the problem that the coil is deformed easily in the process of smooth mercerization,the weft plain knitted cotton fabric before mercerizing was stretched bilaterally,the shape changes of coils under different tensile conditions were studied.The fabric was divided into different units by a grid method,and the change rule of the displacement vector,coil spacing,coil height,shape coefficient and shear angle of different elements under biaxial stretching were studied.The results show that the less deformed region of fabric is elliptical,and with the tensile tension increases,ellipse area reduces,and the coil spacing and the coil height obey the trend of the parabola;the coil shape coefficient has a periodic gradient distribution,the maximum shear angle of the fabric decreases,and all the shear angles decrease slowly.