Today, the grinding processes in the bulk material industry must meet much higher demands due to clearly increased requirements on the product properties. Narrow particle size distribution, low fines content, minimum product heating, easy to render inert, high specific throughputs and at the same time low energy consumption, low-wear with highest availability – the roller mills applied in the chemical, mineral and metal industry, the food industry and the pharmaceutical industry meet all these requirements to a great extent.
In the coffee and grain industry roller mills have been standard for decades. In the coffee grinding sector, for instance, a high yield in a certain size range with a minimum of fines is extremely important. Depending on the demands of the final consumer, the beans are ground by roller mills with corrugated or smooth rollers. Without further classification, the individually ground coffee proceeds directly to packaging.
The roller mill does not require downstream screening or sifting systems or at least the costs for this process step are considerably lower. This distinguishes the roller mill from many other mill types, which often require a cost-intensive recirculation or disposal of the undesired fines. Besides the ATEX requirements are much lower on slowly running roller mills than on the traditional fast running mill types.
Roller mills are able to grind very hard up to plastic products very homogeneously and with a minimum of fines to up to approx. 100 µm depending on requirement. The main characteristic is a clearly narrower particle size distribution, particularly in comparison with impact grinding.