Comparison of Different Theoretical Models of Fancy Yarns

Abstract

A study deals with the analysis of the theoretical models of the fancy yarns. The investigated fancy yarns are of traditional structure, i.e., their effect intermediate product composed of two yarns as well as of complex structure – their effect intermediate product made of three yarns. The analysis is done using two theoretical methods for predicting the coil length of the binder yarn in the fancy yarn. Theoretical values of the coil length of the binder yarn of 29 types of investigated fancy yarns are compared with the experimental data. The experimental comparison was performed for various structure fancy yarns specially manufactured for this investigation and using data presented by the other authors. The comparison between the calculated coil length values and experimental data shows good agreement for 21 results (according to the 1st and 2nd method). Here the deviations not exceed 5 %. The developed analysis showed that the both theoretical methods could be used for the predicting of the geometrical indices of the fancy yarns, still the method satisfying the requirement of the precondition about the circle shaped cross-section of the effect intermediate product is more precise in many cases.