Optimization of Drafting Conditions in the Break Drafting Zone Additional Pressure Bar on INA-V Spinning Frame

Abstract

To improve the yarn quality, the pressure bar was installed in the break drafting zone of the INA-V spinning frame. The process parameters were optimized in the break drafting zone with pressure bar of the INA-V spinning frame, the drafting principle in the break drafting zone with pressure bar of INA-V spinning frame was analyzed, and the sliver configuration was observed in the break drafting zone with pressure bar. The result revealed that installed the pressure bar in break drafting zone after, when the roving twist factor was small, CV%, thinness, thickness and neps of the yarn spun decrease as the break drafting ratio increase; when the twist factor of roving was larger, the break draft ratio as 1.3 time was optimum drafting conditions. The yarn quality was improved as roving twist increased.