Developing a new drafting system for ring spinning machines

In order to raise yarn quality, a new drafting system concept for ring spin ning machines is developed in this study, along with an analysis of its con trolling effects. To optimize the new drafting system, its structural param eters are studied and two empirical equations for yarn unevenness and nep c ount model its design. The equation of yarn unevenness is used to find the optimum structural parameters of the new drafting system. Practical spinnin g tests with the optimized system prove that it can reduce unevenness, thin places, thick places, and neps in spun yarns, and that the equation for ya rn unevenness can be used to satisfactorily estimate the unevenness of spun yarns.