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The roller press is designed according to the principle of material bed grinding. The main characteristics are: high pressure, full speed, full feed, bed crushing. The roller press is composed of two phase synchronous rotation extrusion roller, a fixed roller, a movable roller.

Material from the top of the two roll to the input, the extrusion roll into the roll continuously, after the high pressure of 100-150MPa, into a dense material cake from the machine under. Out of the material cake, in addition to containing a certain proportion of fine particles. In the interior of the non - product particles, a large number of cracks are produced, which can improve the grinding ability of the material.

The material is divided into three stages by means of grinding roller, which is full of dense, laminated and crushed.