The working principle of the High Pressure Roller Mill is two rolls, which are counter rotating at the same circumferential speed. One roll is connected to a hydraulic system which creates a radial force.

The feed to the rolls creates a so called “bed” of material in the roll gap. Within this material bed, the product is intensely compacted and the strain that the single particles have on each other effects them
being ground.

Materials with good flowing properties and high bulk densities need just the gravity flow to feed the machine.

Materials which are light and have poor flowing properties are fed into the roll gap by a pre-densifying screw which moreover increases the mill’s efficiency in a significant way.