Influence of Draft on Fibre Cohesion Characteristics

Abstract

An attempt has been made to study & analyze the arrangement of fibres in the yarn, and to examine the influence of draft distribution at every stage of yarn manufacturing on fibre cohesion, yarn structure and characteristics. The arrangement of fibres is through intermingling of constituent fibres, generated due to the draft, drafting system and level of twist. Fibre overlapping, fibre migration, packing coefficient, and longitudinal behavior of fibres also depend upon the draft distribution at different stage in spinning process. In a card sliver the fibres lie crisscross and entangled. They are either in the form of leading hook, trailing hook or hooked on both ends. The process of drafting reduces the number and extent of hooks. Higher fibre-to-fibre friction in a fibre strand need more drafting force this affects the fibre moment during drafting which influence the fibre orientation i.e. arrangement in a yarn. The change in fibre orientation ultimately affects the yarn quality. Keeping in view the above points, the present study has got significant findings on iInfluence of draft on fibre cohesion in terms of fibre orientation in sliver and tenacity of sliver and roving.