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Roller crusher is mainly used in the middle and fining crushing of these medium hardness materials such as limestone ,cinder ,coke and coal .And it is mainly used in cement ,chemical ,electronic ,metallurgy ,construction ,fireproofing etc industries. Roller Crusher Roller crushers which are different from jaw crusher and impact crusher are available with breakthrough 3-D crushing technology that includes intermeshing continuous tooth roll design and positive roll timing that delivers the industry"s best dimensional product control, fewer fines and elimination of over-size material. roll crushers deliver higher quality cubical product, minimal fines and consistently repeatable performance for sizing coal, coke, glass, fertilizer, potash, salts, lime, limestone, soft ores, friable materials and industrial minerals.construction chute: http://www.hxjq-crusher.com/S257.html made in china crushers: http://www.crusher-machine.com/n215.html Advantages of roller crusher: 1.Large feeding granularity .The discharge granularity can be adjustable automatically .And it can crush all materials which anti pressure is less than 160 MPa. 2.Even granularity, low production cost. 3.Operation is easy. Roller Crushers are compression type crushers, and were once widely used in mining. They have, within the last 10 or so years, fallen into dis-favor among mining and processing companies. The probable reason is because the large mines require very large crushed product output with minimal cost, makes the roll crusher uncompetitive. The roll crushers are not nearly as productive as cone crushers, with respect to volume, and they do have a little higher maintenance associated with them. Roll crushers do, however, give a very close product size distribution, and if the ore is not too abrasive, they do not have high maintenance costs.