并纱是捻线的准备工序，其任务是将两根或多根（一般不超过5根）单纱并合后卷绕成筒子。经过并纱，可以保证单纱股数，均衡各单纱张力，减少股线捻不匀，提高股线强力，改善外观。
并通过与包缠纱织物和并捻纱织物的性能对比，得出差捻包缠纱织物的优势所在，指出差捻包缠纱织物在精纺领域应用是完全可行的。
By comparing with wrapped yarn fabric and doubling twist yarn fabric, the conclusion that the application of differential twist wrapped yarn fabric to worsted spinning is practicable was acquired.
并开发了一套以“纱模”为基础的计算机模拟显示系统。
A displaying system of computer simulation was developed based on the "yarn model".
本文通过分析推导，找出了罗拉扭振纱疵的特征方程，并就其波谱图、曲线图、布面外观特征进行了研究。
Through analysis and inference, the writer finds out the feature equation of roller turn vibration yarn faults, and researches its wave spectrum, curve, fabric appearance characteristics.
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