Experimental Analysis of the Tensile Properties of Fancy Loop Yarns: Part II

This article compares the tensile properties of real loop fancy yarns produced on a ring twisting machine with the results generated by mathematical models derived in Part I. The theoretical strength of the produced loop yarns was calculated on the basis of input variables of a mathematical model describing tensile strength of loop yarn, with the assumptions of lack of migration of fibers in component yarns and of full migration of fibers and with two assumptions of fiber length distribution in component yarns: trapezoidal and uniform. The test examinations were conducted on four different types of loop fancy yarns, with variable values of the twist of the loop fancy yarns produced on the ring twisting system. Every test was repeated 50 times. It has been found that the results generated by the mathematical model describing tensile strength of a loop yarn are the most consistent with experimental results when we accepted the assumptions of full migration of staple fibers in component yarns and of a trapezoidal distribution of staple fiber lengths in these yarns (a difference of about 5%).