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The roller crusher is also called the double roll breaker. 

This machine has the characteristics of small volume, high crushing ratio (5-8), low noise, simple structure, uniform granularity of materials, low rate of over-crushing.It can grind the salt size between 0.5mm and 2.5mm, easy to maintain, sensitive overload protection, safety and reliability. Other types of crusher can’t guarantee the granularity of salt, normally the over-crushing rate is much higher than roller crusher.