Theoretical Relations between Manufacture Factors of Covered Yarn and Coil Length of Covering Components

Abstract

Elastomeric covered yarns are widely used in stretch textiles. The current investigation is aimed at structure of covered yarn, which consists of polyurethane elastomeric multifilament core yarn and of two viscose multifilament yarns. In the article the theoretical relations between manufacture factors of covered yarn and coil length of covering components are proposed and analysed. A development of the earlier proposed predicting method of the coil length of covering yarns is used. The relations link the delivery speed of covered yarn, the rotational speed of the first and the second hollow spindles, and the core stretch ratio during wrapping on the one hand, and the coil length of covering components on the other hand. The evaluation of the influence intensity of each manufacture factor on coil length is proposed. The average partial differences of the functions are also found.