FINENESS MODULUS (FM), Disk Attrition Mills, Crushing ...
Hammer Mills. Contain a high speed rotor turning inside a cylindrical case. The rotor carries a collar bearing a number of hammer around its periphery. Main force in size reductionimpact forces and a bit of attrition. Hammer can be replaced by knives/other devices to give the mill the possibility of handling tough, ductile or fibrous materials.