罗拉不经校调即可直接上车，大大减少维修工作量，提高工作效率。
前罗拉压力改变对牵仲力影响很小；
The pressure variation of front roller influences the drafting force slightly.
与粗纱工序相似，前罗拉的转速高于后罗拉的转速。
Just like in the roving step, the front set of rollers rotates faster than the back one.
通过控制前罗拉与后罗拉的转速，由软件实现对粗纱牵伸倍数与捻度的控制。
By controlling the speed of front roller and back roller, the software controls the pulling times and twisting degree.
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