Studies on Filament Migration in Air-jet Textured Yarns and the Relationship between Migration Parameters and Properties

Abstract

A study to characterize the structure of air-jet textured yarn in terms of its migration parameters has been carried out by using the tracer fibre technique. An attempt has been made to establish the relationship between the migration parameters and the properties of air-jet textured 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 modulus were measured for various air-jet textured yarns produced using different air pressures. Migration was found to be highest in polyester (wet textured) yarns followed by wet textured polypropylene and nylon yarns. It was observed that physical bulk, loop frequency and initial modulus increases with increasing migration parameters, while tenacity, instability and breaking elongation decreases with migration parameters. Yarns produced from all three materials show similar trends. Bearing in mind the differences in dpf, t...