PROCESS:

The RAPRA Ring-Roller-Mill contains 3/5 rollers which rotate on a ring. The material, to be ground, is fed through the rotary feed into the grinding-chamber. The material is crushed in between the rollers and the ring. The powder is air-lifted and the classifier passes only the required-fines. The coarse particles are not allowed to pass the grinding-chamber till they become of the required mesh-size. The fines are seperated out fom the air-flow by the effecient cyclones, and the product is collected through the air-lock valve, which keeps the air inside the machine and only passes out the fine-product. The working atmosphere is dust-free due to the special 'negative-pressure' created inside the RAPRA machine and its high effecient design.

The main force which results in the compression of the material is the centrifugal-force developed by the rotation of the rollers on the ring.

The mill is suitable for almost all Minerals, Chemicals, Insecticides, Resins, Sulphur, Coal, Quartz, Calcium-Carbonate, etc. The RAPRA mills are designed for high productions with the least power-consumption and trouble.