With elongated treated time and increased thickness of coating, loose coating begins to appear on the coating exterior, at last the thickness can reach 90% of total thickness.

随着处理时间的延长及膜层的增厚，其外侧开始出现疏松层，最终可达到膜层总厚度的90 %左右。

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All holes, slots, edges and corners should be free of loose burrs and slivers. The allowable height of a burr cannot exceed five percent (5%) of the material thickness.

所有孔，缝，边和角必须没有毛刺和锐边。允许的毛刺的高度不能超过材料厚度的5%。

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At last thesis introduce the control mode of loose circle thickness. Thesis has use for reference mine supporting.

并介绍了控制松动圈厚度的控制方法，对井下支护设计具有借鉴意义。

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