Tensile property of textile yarns is a prime important parameter in determining the suitability for any particular application. It is therefore of utmost importance to determine this characteristic accurately. There are three basic principles for measuring yarn tensile strength. But for measuring single yarn tensile strength mainly constant rate of extension (CRE) and constant rate of loading (CRL) principles are used. A single yarn shows two different results of breaking load and elongation value in these two methods due to the difference in measuring system. In this article a comparative study is carried out between these two methods.

Key words

Yarn breaking strength, breaking elongation, CRE, CRL, Correlation, Regression


It is absolutely essential for spinners today to test weaving or knitting yarns properly prior to actual use or further processing. Breaking strength, elongation, elastic modulus, resistance abrasion etc. are some important factors which will represent the performance of the yarn. Among all these measurable tensile properties of spun yarn, considerable attention has been paid on the evaluation of tensile strength and breaking extension, as these properties of the spun yarns influence the efficiency of weaving and knitting machines and the quality of the fabric produced from them.

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Originally Published in Journal of the Textile Association, July-August,2011

The author is associated with Wool Research Association, Thane