Abstract

Studies have shown the effect of two different fibre parameters (fibre length and fibre fineness) as well as core-sheath ratio of yarn on the physical properties and structure of Dref-III yarns. Different response surface equations have been derived for prediction of different physical properties of Dref-III yarn with Box and Behnken’s factorial design for 3-levels and 3-variables. Different contour curves have been constructed to study the interaction effect of various variables on different responses. Use of coarser fibre in normal range and increase in core content has a positive resultant effect on strength translation of fibre in yarn, specific work of rupture and evenness of yarn. Increase in fibre length and core content has increased the strength translation, breaking extension, initial modulus, evenness, specific work of rupture and packing coefficient of yarn. Increase in fibre fineness has raised the breaking extension of yarn largely. Interaction of fibre length with core content has a positive influence on strength translation of fibre, breaking extension and specific work of rupture yarn. Interaction of fibre length with fibre fineness has a negative influence on breaking extension and evenness of yarn. Interaction of core content with fibre fineness has a negative influence on evenness of yarn. No interaction effect can significantly influence on initial modulus and packing coefficient of yarn.

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