尽管辊子的技术和性能提高了，但是主要由缠辊和刹车引起辊子表面的剥落仍然不可避免。
In spite of the improvement in rolling techniques and roll performance, spalling of roll surfaces, mainly caused by pinching and skidding of strip, cannot be avoided.
当新大绳在绞车辊筒上都排好之后，上提游车，试绞车的刹车，检查辊筒上的大绳是否排紧。
With the new drilling line properly reeved on to the drawworks drum, pick up the weight of the traveling block, test the drawworks brake, and verify that the drilling line is tight on the drum.
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