在下放或拆卸顶驱系统之前，要保证辊筒上留有足够的大绳圈数。
Prior to lowering the top drive system or rigging down, ensure that sufficient wraps of drilling line remain on the drum.
应用建立在概率统计理论基础上的可靠性设计方法，探讨了压延机辊筒刚度的可靠性问题。
Using the reliability design method based on mathematical statistics theory, the reliability problem on calender roller rigidity was discussed in this paper.
非常柔韧，使用皱纹离型纸，固定橡胶及感光树脂版于印刷辊筒上。
Strong flexible, using crepe separating paper, it's used to fix rubber or photosensitive resin plate on printing roller.
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