双向拉伸下的纬平针织物线圈形态分析

Analysis on Loop Shape of Plain Knitted Fabric under Biaxial Elongation

采用二维线圈结构模型,计算纬平添纱针织物的针编弧、圈柱和沉降弧在双向拉伸下的长度变化,进而分析线圈形态变化和纱线转移情况.实验结果表明:在横向拉伸、纵向高度不变的双向拉伸下,圈弧长度增加,圈柱长度减少,纱线由圈柱向圈弧转移;在纵向拉伸、横向宽度不变的双向拉伸下,圈弧长度减少,圈柱长度增加,纱线由圈弧向圈柱转移.理论结果和实验结果具有较好的一致性,表明此二维线圈结构模型可以用于分析和预测纬平针织物在双向拉伸下线圈形态变化和纱线转移.

A two-dimensional loop structure model is proposed to calculate the length of head loop, leg and sinker loop of plain knitted fabric under biaxial elongation, and predict the loop shape change and yarn transfer during elongation process. The experimental results indicate that yarn transfers from leg to curved sections under strip biaxial elongation in course direction, while it transfers from curved sections to leg under strip biaxial elongation in wale direction. Good accordance between the theoretical data and measured results shows this model can be used to predict the loop shape change and yarn transfer of plain knitted fabric under strip biaxial elongation within acceptable accuracy.