The impact of dynamic stresses on reduction of breaking force and abrasion resistance of warp yarns

Investigations of warp yam deformation in weaving are described. Yam distortions were analyzed on the basis of testing breaking force before sizing, after sizing, after weaving and after desizing. Warp yam deformation was also analyzed by testing warp yarns to abrasion. Three warps of the same raw material content were investigated, two of them of identical fineness. After weaving, warps were tested both sized and desized. Various weaves were used, as well as various shutleless weaving machines: cam looms, dobby looms and jacquard looms. Different level of warp yam deformation was noted - the highest being using plain weave, and the lowest with jacquard ones. The range of warp yam deformation was obtained by testing yam breaking force, from the highest (plain) to the lowest (jacquard). The sequence of deformations obtained by testing yam resistance to abrasion is also given.