A novel method for reducing yarn hairiness with dynamic and static friction rollers on the yarn guide

Abstract

Fiber torsional control is critical for reducing the hairiness of high-quality yarns during the yarn formation process. However, the applied fiber torsion that facilitates fiber motion and transfer in conventional ring spinning is still under exploration. In this study, we designed a device with dynamic- and static-friction rollers for reducing harmful hairiness. The key mechanisms and mechanical model of the applied forces on fiber torsion and motion contacting dynamic- and static-friction rollers were theoretically analyzed. Exceptional fiber torsion was obtained by creating gradient friction resistance from the varied applied pressures while providing full internal and external transfer to forcibly capture and trap exposed fibers into the main yarn body. Compared to conventional ring-spun yarns, yarns spun by the dynamic-friction roller exhibited reduced harmful hairiness, improved tensile properties, a tighter yarn surface, and improved yarn irregularity. However, the excessive force applied by the static-friction roller deformed exposed fibers to cause fiber accumulation and fiber loss, resulting in reduced yarn performance. These results can be used to develop novel spinning methods for various fiber materials for high-quality yarn production.