Abstract: In this paper, tensile properties of polyester taffeta in 7 different specifications have been tested, in directions of warp and weft respectively. At the same time, the entire stretch processes have been recorded by high-speed camera, the digital information of which is analyzed. The results show that: the initial phase of the stretch belongs to mechanical high modulus area, longitudinal elongation becomes slow, but the width is reduced; the intermediate stage of the stretch is mechanical low modulus area, longitudinal elongation speed up, the speed of width decrease slow down; in the tail phase, yarn extend along the direction of the force, the fibers slip, modulus increase, changes of the specimen width appear more smoothly. The range ability of residual rate of width in the warp direction at the first feature points is larger than the weft direction. By the cover degree increases, the change rate of width appears the decreasing trend at the first and second stage.

Key words: fabric, drawing, dynamic analysis, mechanism