Tenacity and breaking extension of cotton covered copper open-end friction-spun yarns

Dref-3 friction-spun core conductive yarns of the count 328 tex have been produced by wrapping a fibrous sheath of MCU cotton fibres around the copper filament (count 261 tex) as a core. Three different core-sheath ratios, such as 67:33, 80:20 and 90:10, have been produced by varying the draft in the second drafting unit which feeds the cotton carded slivers to cover the core component. The process parameters such as perforated drum speed and yarn delivery rate are kept constant at 4000 revolutions/min and 70 m/min respectively. The tenacity, breaking elongation, contribution of individual core and sheath components to the tensile properties and electrical properties of core conductive yarns have been studied along with the use of ANOVA multivariable analysis to analyze the interaction of coresheath component in the breaking tenacity of conductive yarns. The characteristic tests report shows that the 67:33 core/sheath conductive yarns has the highest tenacity of 3.27cN/tex and elongation-to-break of 5.27% as compared to other core-sheath yarns studied.