Abrasive sleeve quality requirements
1. No sand deficiency is allowed on the surface
2. No creases, wrinkles or holes
3. Degumming is not allowed between layers
4. The sand ring made of screw joint has a gap of less than or equal to 1mm between the edge and the edge joint
5. The cylindrical sand ring with an inner diameter of more than 100mm should be idled for 3min at a speed of 34m/s and should not be broken
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