阻尼牵伸纺纱技术及其对成纱质量的影响

从纺纱牵伸装置结构和牵伸机制方面,阐述了新型环锭纺阻尼牵伸系统提高成纱质量的原理及应用效果。分别采用传统环锭纺和阻尼牵伸纺技术纺制羊毛/羊绒混纺纱,并对成纱均匀度和强力指标进行测试,采用差异率进行对比分析。结果表明:阻尼牵伸系统可以显著改善成纱条干均匀度,降低粗节、细节、棉结、毛羽量等指标,其中粗节(+50%)数量降低41.0%,最为显著;成纱的强力、断裂伸长率和断裂功等力学指标有所提高,其中断裂伸长率提高23.1%,阻尼牵伸技术对提高毛纱的成纱质量具有良好的效果。

Research on damping drafting technology and its influence on yarn quality

The principle of improving the yarn quality with damping drafting system is described in terms of the structure of the device and the drafting mechanism.A magnetic pressure system was used in the damping drafting system to form a flexible grip drafting zone through the upper control panel,the grid loop and the curved panel,and the frictional force boundary of the drafting zone was optimized,thereby effectively controlling and drafting the fiber strands.It gets rid of the limitation of the difference of the surface speed between the upper and lower aprons on the yarn quality.The wool/cashmere blended yarns were spun by conventional ring spinning and damping drafting device,respectively,and their performances were tested and the quality indexes were compared by using the difference rates.The results show that the damping drafting system can improve the evenness of yarns,and reduce the parameters such as the slubs and thin places per kilometer significantly.Among them,the+50%thickness decreased by 41.0%;the mechanical strengths such as yarn strength,elongation at break and fracture work increased,and the elongation at break increased by 23.1%.It is believed that the damping spinning drafting system could optimize the force field distribution in the drafting zone and improve qualities of the wool yarns.