Abstract: This paper studied the effect of different cross section of PBT filament (round shape, ? round shape and C-shape) on the elasticity of PBT/PET warp knitted fabric. The knitting structure is locknit. The front bar is threaded with 50 D/24 f PET filament, while the back bar is threaded with 50 D/24 f PBT filament. In order to compare the elastic elongation under 100 N tension, the drawing density was controlled at 16, 18, 20, 22, 24, 26 loop/cm respectively. For different cross-sectioned PBT filament under same drawing density, the yarn feeding speed is the same. The results show that the fabric made of round-shaped filament had better elongation. Besides, the fabric made of C-shaped filament had the best elastic recovery.

Key words: warp knitting; PBT; elongation; elastic recovery