2. Flexibility (the index affects the life-span of the roller and belt, as well as the driving power of the machine)
3. Dust resistance performance(the index affects the life-span of roller)
4. Shock resistance performance (the index affects the life-span of roller)
5. Rotational resistance (the index affects the life-span of tape)
6. Axial carrying capacity (the index affects the life-span of roller)
7. Water resistance performance(the index affects the life-span of roller)
8. Axial string momentum (the index affects the life-span of roller directly)
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