Technology

Hammer mills

The hammer mills grind by means of a high speed rotating steel "hammer" and has a sieve in the periphery through which the sample leaves the grinding chamber. By selecting different sieves the particle size distribution in the sample can be varied. The hammer mill is typically used to produce a fine and homogeneous sample. The Perten Instruments hammer mills can grind up to 300 gram samples which is the requested amount in for example the Falling Number test. Because of the heat development in the grinding operation and the high air flow through the grinding chamber this type of mill is not suited for grain moisture determination.

Disc mills

The disc mills grind the sample between one stationary and one rotating metal disc with teeth. The main application for the disc mills is grain moisture determination thanks to the possibility to grind grain without moisture loss. The particle size from the mill can be varied by adjusting the distance between the stationary and the rotating disc. There are also different disc types to choose from.