中文摘要：

纱线的强力利用率是关乎原材料性能是否得到充分利用的指标之一,为提高纱线强力在不改变原料的前提下,通过纺纱方式调整成纱的结构来提高其强力。为此,从理论公式预测角度和实验论证角度分别对单纱结构、股纱结构和包缠结构纱线的强力利用率进行了研究,用理论模型描绘出3种结构纱线在不同捻系数下的单纱强力利用系数,再通过实验在环锭细纱机上加捻长丝单纱和并捻长丝股纱,在花式捻线机上纺制包缠结构纱线,考虑了因加捻引起的纱线线密度和捻系数的增长因素,分析对比了3种结构纱线的单纱强度利用系数,结果与理论预测大致相似,因此,所推导的力学模型可以用来定量确定强度利用系数变化趋势,在纺纱之前可用来寻找较优的加捻工艺参数,对生产实践起到一定的指导作用。

英文摘要：

Yarn strength efficiency is one of the indexes whether the performance of raw materials is fully utilized. On the premise of unchanging the material, adapting a new spinning means to adjust yarn structure is one of the ways to improve its strength efficiency. This paper studied the strength efficiencies of single yarn, plied yarn and wrapped yarn. The theoretical model can depict the single-yarn strength efficiency coefficients of the three yarns under different twist factors. The single yarn and plied yarn are spun on ring spinning frame, and the wrapped yarn is spun on fancy twisting frame. Considering the growth of yarn linear density and twist factor caused by twisting, the single-yarn strength coefficients are used for comparison. The results are similar to the theoretical prediction. Therefore, the model can be used to quantitatively determine the change trends of strength efficiency coefficients, which can be applied to find the optimum twisting parameter before spinning, and plays a guiding role in production practices.