STUDIES ON FILAMENT MIGRATION IN AIR-JET TEXTURED YARNS AND THE RELATIONSHIP BETWEEN MIGRATION PARAMETERS AND PROPERTIES

A study to characterize the structure of air-jet textured yarn in term s of its migration parameters has been carried out by using the tracer fibre technique. An attempt has been made to establish the relationsh ip between the migration parameters and the properties of air-jet text ured yarns using polyester (dry and wet textured), nylon (wet textured ) and polypropylene (wet textured) yarns. Physical bulk, instability, loop size,loop frequency, tenacity, breaking elongation and initial mo dulus were measured for various air-jet textured yarns produced using different air pressures. Migration was found to be highest in polyeste r (wet textured) yarns followed by wet textured polypropylene and nylo n yarns. It was observed that physical bulk, loop frequency and initia l modulus increases with increasing migration parameters, while tenaci ty, instability and breaking elongation decreases with migration param eters. Yarns produced from all three materials show similar trends, Be aring in mind the differences in dpf, the polyester feed materials sho wed relatively higher migration and better properties.