Reduction Of The Theoretical And Applied Research Of The Cone Yarn Hairiness

A brand-new vortex nozzle on the basis of principles of false twisting is designed and attached into SAVIO winder. It can control and reduce the yarn hairiness efficiently because yarn hairiness is produced in spinning process and mainly increased in winding process.The influence of each factor on rotational equation of yarn ballons is analyzed and then vortex nozzle is produced. When the twisting yarn passes through the nozzle, yarn hairiness can be significantly reduced. This reduction is possibility due to the hypothesis that the yarn structure is loosened first before the yarn enters the air-jet nozzle, and subsequently tightened up. In this action, protruding fibers are wrapped into the yarn body by the swirling airflow provided by the nozzle.The characteristics of airflow in the nozzle are studied. By analyzing the air flowing condition in air reservoir, jet orifice and twisting chamber in theory, the conclusion is achieved that the chamber in radial direction is divided into potential flow swirling zone and similar solid swirling zone, In similar solid swirling zone, the yarn swirl as rigid body, but in potential flow swirling zone, the yarn doesn't swirl. Analyzing the stress of the yarn in chamber, rotational equation of yarn ballons is deduced and the effects of nozzle parameters on yarn predict hairiness.The jet orifice diameter , twisting chamber and nozzle pressure which affect rotational equation of yarn ballons are selected for changing factors. The experiment is design by utilizing orthogonal regression design and regression equation about the yarn hairiness index (≥3mm) is achieved. The effect of each parameter on the yarn hairiness is analyzed. In this paper, hairiness index is taken as goal function and the restrain condition of inequality for optimization is selected. The optimal regression equation and the optimal combination of each parameter for reducing yarn hairiness are obtained.By researching this project, I hold that the hairiness problem could be resolved by attaching a jet nozzle into winder. But, using-reducing nozzle in jet-wind system causes yarn irregularities to some extent because the hairiness wraps into the main fiber in short length, which may probe a thick knob.