Dynamic analysis and mechanism study of drawing process of polyester taffeta

7 polyester taffeta fabrics with different cover factors were subjected to warpwise and weftwise drawing respectively and at the same time,the entire drawing process was recorded by the high-speed camera.The digital information of the fabrics from extensional deformation to breaking was analyzed.The study showed that the initial stage of the drawing belongs to mechanically high modulus area,longitudinal elongation becomes slow,but the width is reduced;the intermediate stage of the drawing is mechanically low modulus area,longitudinal elongation speed is up,and the speed of width decrease slows down;in the tail stage,the yarns extend along the direction of the force-bearing,the fibers slip,modulus increases,changes of the sample width appear more smoothly.With respect to the residual change of the width at the first feature point,along the warp direction is greater than along weft direction.The change rate of width appears increasing trend at the first and second stages as the cover factor increases.