Analysis of the influence of the guided needle structure on the vortex spinning process and yarn properties

Based on the nozzle structures of MVS870 and J26, this paper analyzed the influence of the guided needle existence and length on the vortex spinning process and yarn properties. In this research, we compared the airflow pressure and velocity distribution under different guided needle structures in the twisting cavity, combining with the numerical simulation of the fluid dynamics model. The influence of the negative pressure and the airflow velocity changing law on the yarn structure and properties was verified by experiments in this paper. The results show that the existence of the guided needle structure could help the head end of the single fiber get into the center of the yarn with less pulling-out by the high-speed rotating airflow, and then improve the yarn tightness and the yarn binding force on the fibers, which will result in a greater extent, as the length of the guided needle is larger. This study present a feasible theoretical analysis for the influence of the guided needle structure on the vortex spinning process and yarn properties, which has guiding significance in actual production practice.