Light diffraction used as optical instrument to measure texturing of filament yarns

摘要

Non-textured filament yarns tend to exist side by side in a parallel and even way. The surface is smooth compared to the less uniform and hairy surface of staple fiber yarns [1]. For many applications staple fiber specific properties are desirable with retention of the continuity of a filament at the same time. Through texturing the filament yarns obtain customizable properties such as high bulk, high elasticity and porosity. The properties of textured filament yarns are currently measured offline in the laboratory. Online optical methods for the characterization of filament yarns on the running yarn do not exist. Offline measurement methods are costly and generate only statistical information on the quality of the yam by random sampling. Besides the state-of-the-art of the measurement of textured yarn parameters, a potential method for the direct optical measurement of textured filament yarn is presented here.