On the Question of Geometry of Fancy and Covered Yarns Manufactured by Means of Hollow Spindle Technology

Abstract

A common feature of all the fancy and covered yarns examined in the current research is a spiral arrangement of binder and covering components in these samples. This study gives the novelties of the approach into geometrical models of some complex structures. The theoretical assumptions on this matter are suggested and discussed. A structure of effect intermediate product of complex structure fancy yarn is composed of three components. One variant of the research corresponds to a case of the intermediate product of fancy yarn composed of the following components: two components have the same diameter that is smaller in compare with the third component. In the another variant all the diameters of these three yarns have equal values. Also a model of a covered yarn composed of a core and the two covering yarns is presented. According to this model a proposal to evaluate the evenness of intermediate product composed of a core wrapped by first covering component is done. The predictive equations for a length of the binder component in complex structure fancy yarn as well as for the covering components in covering yarns are suggested. The necessary parameters for this predicting are discussed. To evaluate a predictive fitness of these equations the experimental data also are presented. The experimental verification of theoretical models for traditional fancy yarn structure and elastomeric covered samples was done using data of other researches as well.