Through the innovated design of the drafting gear and optimization of the drafting process and drafting multiply in the rear section, the best solution is found for the big ration drafting process.

• 通过对粗纱机的牵伸齿轮进行重新设计改造，对粗纱机牵伸工艺、特别是后区牵伸倍数进行了优化试验，找出了适应重定量牵伸的最佳工艺方案。