Pelletising is a process used to press material in to a more compact form.
Pellets can be made from different materials; yet the material must meet certain requirements:
Small particle size
Low moisture content (10-15%)
If the material does not have these properties, it can be treated with mechanical forces and thermal processes, e.g. with a disintegrator and a drying plant, in order to obtain the desired state.
The pellet mill is a machine that is used to press the material into pellets by means of compacting.
The pellet mill consists of a round metal ring with drill holes, which is called matrix, and two small pressing rollers inside, which are called kollers. The substrate is directed into the internal space; when the small particles are in between the pressing rollers and the interior of the matrix, they can only exit through the holes of the matrix. After the compressed material has left the matrix, a knife cuts the pellet strand to pellet size.