EFFECT OF YARN COUNT AND TWIST FACTORS ON THE PHYSICAL PROPERTIES OF SINGLE YARNS IN TWO EGYPTIAN COTTON CULTIVARS

Document Type : Original Article

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Cotton Research Institute, Agricultural Research Centre, Giza, Egypt

Abstract

The present study was carried out on two Egyptian Cotton culti­vars namely Giza 75 (Long staple) and Giza 77 (Extra long staple) to in­vestigate the effect of yarn count and twist and their interaction on sin­gle yarn properties and, to study the relative contribution of fiber properties to single yarn strength, yarn irregularity (C.V. %) and nep count at 60s count with 3_6 twist factor. Single yarn strength, regularity and single yam elongation for the two cultivars and stiffness for Giza 77 only declined when going from coarser to finer yarns. Thick places, thin places and nep count increased as yarn count became finer for the two cultivars. Increasing twist factor led to significant increase in thin places, thick places and nep count for the two varieties and yarn toughness and yarn elongation for the long cultivar Giza75. Increasing twist factor led to significant decrease in C.V.% and yam stiffness for giza 75 only but single yam strength was not influenced by twist factor for the used range of twist factors in the two cultivar. For Giza 77, fiber strength was the most important contri­butor to yarn properties, while for Giza 75, micronaire value was the most important contributor.

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