Abstract:

In order to develop a realistically applicable auxetic fabric and strdy the influence of production parameters on its auxetic performance, the principle of rotational strures based on deflective tulle nets, the principle of rotational structures which unfold when stretched was adopted to the designing of auxetic warp knitted fabrics. Polyester DTY was chosen to knit basic structures and nylon was used for miss-lapping chains of front bar. Then four knitting plans were designed and let-off values of each sample were adjusted during the weaving process to summarize the effectiveness of all the factors. Experimental results show that properties of yarns have a significant influence on fabric auxetic effects, especially yarns stiffness and elasticity. Knitting structures of front bars, as well as let-off values of front bars’ chain parts also have some effects and its auxetic properties have a complicated correlation with the degree of tulle nets deflection as well.

Key words: negative Poisson's ratio, warp knitting, structure, net structure