环锭细纱机VC型牵伸工艺优化的实践

介绍了环锭细纱机VC型牵伸装置的基本特点及各部对成纱质量的影响,分析了其牵伸机理,测试了后区压力棒、前区隔距、低硬度高弹性大直径胶辊、钳口隔距、罗拉隔距、前后胶辊直径小档差等对成纱质量的影响。指出:VC型牵伸型式在合理的前区隔距、低硬度高弹性大直径胶辊、适度钳口隔距、大后区罗拉隔距、前后胶辊直径小档差搭配时,成纱条干CV值、千米粗细节及棉结等随后区牵伸倍数增大而减小;胶辊前冲4 mm,合理张力架尺寸、大后区隔距、大粗纱捻系数配合适度后牵伸倍数,稳定平衡了牵伸力和握持力,能保证VC型牵伸装置质量稳定。

Practice of the Optimization of VC Draft Process on the Ring Spinning Frame

Introduction is made to the basic features of the VC draft device on the spinning frame and the impact of the same on spinning quality. Analysis is done to the drafting mechanism. The impact of the rear press bar,space of the front area,the big-diameter cot with low rigidity and high elasticity, the grip space, the roller space, and small-diameter difference of both the front and rear cot is test proved on the yarn quality. Conclusion is made that the spinning mass CV value, the thickness and thinness plus the neps in one thousand meter long yarn increase as the decrease of the draft multiply in the rear area given proper front space, big-diameter cot with low rigidity and high elasticity, the grip space, the roller space, and small-diameter differ- ence of both the front and rear cot. Stable performance of the VC draft device is obtained with 4 mm advance of the cot, proper specification of the tension stand, big space of the rear area, big roving factor with proper draft multiply in the rear area producing stable draft force and grip- ping force.