Abstract:

In order to solve the problem on the setting of the let-off amount of polyurethane locknit elastic fabric, defferent specifications of fabrics were knited using 33, 44, 55 dtex of polyester filament yarns and nylon fibament yarns on 1 st guide bar, while using 44 dtex polyurethane fibers as raw materials on 2nd guide bar. The effect of traction density, linear density and types of yarn, machine gauge and type on the let-off amount of warp knitted elastic fabric was investigated by experiments on the warp knitting machime with types of HKS2-3 E and COP2 KE. The relationship between structural parameters and let-off amount was found through the regression analysis. The results show that the structural parameters of traction density, linear density and types of yarn, machine gauge and type, have significant influence on the let-off amount of warp knitted elastic fabric.

Key words: warp-knitting, elastic fabric, polyurethane fiber, let-off amount, factor