Study Of Open-end Air-jet Spinning

Open-end air-jet spinning is a kind of new spinning method, which utilizes high-speed airflow produced by nozzles to finish twisting and wrapping. It advantage has been recognized more and more people's attention, and it has developing in a high speed in these years.In this paper, the flow field in the nozzles is analyzed theoretically. The movement of fibers in the high-speed airflow and the interaction between fiber and airflow is interpreted. The mechanism of open-end air-jet spinning is explained. Additionally, the separation of spinning is analyzed. Finally, a kind of spinning device of open-end air-jet is designed on the basis of experimented exploration.Compared with the ordinary open-end spinning methods, this open-end air-jet spinning method has the following advantages: the better state of straight and parallel about fiber after separation, little damage to the fiber and the arrangement state of fiber and the strength of resultant fibers can be improved more easily. For this method uses the high speed airflow to assist roller drafting to separate fiber. The roller can control the fibers well, so the fibers can straight and parallel better. While, the ordinary open-end spinning methods use the takerin to loose and separate fibers. In addition, the twist is inserted by the high-speed airflow. Because there is no constraint of high-speed rotating member, this spinning method has the potency of high-speed.A proper description of dynamic twisting process is the basis for the study yarn formation, which can demonstrate the evolving of yarn structure and properties and help to attain high productivity and to improve yarn properties. This paper presents a dynamic differential equation for the twisting process of open-end air-jet spinning through setting up the kinematic equation of variation in the twisting process of yarns.In this study, the twisting process of fiber is also photographed using the technology of high-speed photography. According to the air dynamics and the flow field theory, the...