Investigation of influence various factors on the fibrous covering fixing on the surface of core-spun yarns

The factors were determined which affect to the fixing of the fibrous covering of core-spun yarns: the composition of components in the yarn, the number of fibers in the covering layer, twist, tension of fi lament yarn. Experimentally the dependence of twist contraction of the core of polyester yarn on twist was developed. Parameters of core-spun yarns of linear density 16.7 tex for sewing threads were calculated. It is determined the pressure of polyester fibers on the core component and friction force among them. It was investigated the influence of yarn twist and evenness on the fixing degree of fibrous covering on the surface of core-spun yarn.