THE TENSILE BEHAVIOR OF RING, ROTOR, AIR-JET, AND FRICTION SPUN YARNS UNDER NON-STANDARD LOADING CONDITIONS

P. Radhakrishnaiah and Sundaresan Jayaraman

ABSTRACT

100% cotton yarns representing ring, rotor and friction spinning technologies and cotton/polyester yarns representing ring, rotor and air-jet spinning technologies were tensile tested at a range of traverse rates (50-500 mm/min) to assess the influence of rate of traverse on the tensile behavior of the individual yarns. The yarns were also tested at normal (254mm) and short (15mm) gauge lengths to compare the stress/strain responses and the failure modes obtained at these gauge lengths.

The 100% cotton friction yarn showed a strength versus traverse rate behavior that was different from that of ring and rotor yarns. The ring and rotor yarns reached optimum strength at a traverse rate substantially lower than the maximum while the friction yarn showed maximum strength at the maximum traverse rate of 500 mm/min. The strength versus traverse rate behavior of the cotton/polyester ring yarn was somewhat similar to that of its 100% cotton counterpart but that of the cotton/polyester rotor and air-jet yarns showed a different trend. The strength of cotton/polyester yarns in general was less sensitive to traverse rate than the strength of 100% cotton yarns.

The breaking load and breaking elongation CVs of the individual cotton and cotton/polyester yarns showed some characteristic trends with respect to rate of traverse. The stress/strain behavior of the three cotton yarns at normal gauge length was not associated with an yield point where as that of the cotton/polyester ring and rotor yarns showed a well-defined yield point. Rate of traverse had a slightly greater effect on the initial moduli of cotton yarns and somewhat less effect on the moduli of the cotton/polyester yarns. The 100% cotton ring yarn showed a tendency to break more abruptly than the friction and rotor yarns in the short gauge length test. The breaking elongations of the cotton/polyester yarns obtained in the short gauge length test were considerably higher than the elongations obtained in the normal gauge length test.





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Document last modified July 8, 2004