Influence of Warp Loading on Weaving Machines upon Yarn Deformation

Abstract

The breaking force of warp yarns taken per segments on the loom is measured using three weaves from the same warp on different looms. To simulate the deformation of warp yarns, samples from the warp beam are taken and, after various conditions of cyclic stress on a dynamometer, the most approximate degree of warp deformation is that which occurs in the weaving process per segments on the loom and per weave types. The F-test, t-test, χ2-test, and correlation coefficient reveal that there are no differences among breaking force values of the yarns from the looms or on yarns after cyclic stress and relaxation measured on the dynamometer, meaning that deformation imparted to the warp on the loom during weaving is very similar. Deformation caused by friction among yarns and imparted by metal pieces is not discussed here, but is included in the deformation caused by stress. Under the same conditions of cyclic stress, the elongation of the warp during stress in the segments of the loom is tested, and the conclusion is reached that elongation follows yarn deformation almost linearly. Investigations involve the same weaving conditions on the same loom and with the same warp, employing the three weaves. Dynamic tension of the warp is measured for each weave in the course of weaving, and the change in tension caused by changing the weave is registered.