A systematic study of a modified drafting system based on the ring spinning frame, which is called the SDS (soft drafting system), is reported in this article to raise yarn quality. Two parts of an experiment were conducted to investigate differences between the conventional and modified drafting systems by spinning three kinds of yarns (in part I) and the effects of process parameters (block gauge, pressure on the front rollers and break draft) on the SDS by using response surface methodology (RSM) to spin 18.2 tex cotton yarn (in part II). The results show that the SDS can significantly improve yarn evenness and reduce yarn imperfections of thick places by +35% and +50%, respectively, and neps by +140% per km. In addition, it is noted that the three parameters are all statistically significant for the SDS to spin yarns, while interactions between them are not. More importantly, RSM predicted a minimum CVm% of 13.95% under the optimum conditions of 1.75 mm, 190 N and 1.21 for the block gauge, pressure on the front rollers and break draft, respectively, which is very close to the conditions of the practical spinning test.

为了提高纱线质量，本文报道了对基于环锭细纱机的改良牵伸系统的系统研究，称为SDS（软牵伸系统）。进行了两个部分的实验，以研究传统和改进的牵伸系统之间的区别，方法是通过纺三种纱线（在第一部分中）以及工艺参数（程序规，前罗拉压力和牵伸牵伸）对SDS的影响通过使用响应面方法（RSM）纺制18.2 tex棉纱（第二部分）。结果表明，SDS可以显着提高纱线均匀度，并在较厚的地方将纱线疵点分别减少+ 35％和+ 50％，并将棉结每公里减少+ 140％。此外，请注意，对于SDS纺纱，这三个参数在统计上都非常重要，而它们之间的交互不是。更重要的是，RSM预测在大气压表，前罗拉压力和牵伸牵伸压力分别为1.75 mm，190 N和1.21的最佳条件下的最低CVm％为13.95％。旋转测试。