Influence of warp loading on weaving machines upon yarn deformation

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, chi(2)-test, and correlation coefficient reveal that there are no differences among brea king force values of the yarns from the looms or on yarns after cyclic stre ss and relaxation measured on the dynamometer, meaning that deformation imp arted to the warp on the loom during weaving is very similar. Deformation c aused 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 th e segments of the loom is tested, and the conclusion is reached that elonga tion follows yarn deformation almost linearly. Investigations involve the s ame weaving conditions on the same loom and with the same warp, employing t he 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 wea ve is registered.