Processing Magazine

Centrifugal impact mill grinds, delumps wet or dry solids

February 19, 2007

A new 24-inch sanitary stainless steel Centrifugal Impact Mill Model CIM-24-SS from Munson Machinery provides coarse to fine grinding (325 mesh) of friable materials into controlled particle sizes, as well as lump breaking and conditioning of fibrous materials. High-speed rotation of the inner disc creates centrifugal force that accelerates bulk material entering the central inlet of the opposing stationary disc. As material travels from the center to the periphery of the discs at high speed, it passes through a "treacherous path" of five intermeshing rows of rotating and stationary pins, with the desired tight particle size distribution obtained by controlling the rotor speed. Setting the infinitely variable rotor speed between several hundred rpm and 5,400 rpm provides the flexibility to use the machine for coarse grinding and de-agglomerating as well as for fine grinding. Also called a “Pin Mill,” the unit is said to handle wet or dry materials, to produce tight particle size distribution at any given rotor speed setting, and to sanitize rapidly.