How To Buy Good Quality Primary Charge Roller

Why some primary charge roller will have bottom ash.Because the conductivity is not stable.
Why winter will have bottom ash.Because the rubber has the characteristic of thermal expansion and cold contraction.After the rubber contracting,the skin of the rubber can not connect with the core stably.There are two main reasons affect this problems

1.The rubber is not good .There are to ways the rubber is good or not.
(1) We can pinch glue with our fingers

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