Single stage milling is often insufficient for the production of extremely fine particle size distributions of soft to medium hard materials (up to 3 Mohs). In such cases, conventional fine impact mills are often additionally equipped with screening machines or classifiers to classify the milled product. Undesirable coarse particles are returned to the mill to be ground again. This type of separate processing requires a considerable expenditure of machinery.

So-called classifier mills offer the possibility of having the same milling/classifying effect in one system, with comparably little expense. The Netzsch Classifier Mill CSM is a combination of fine impact mill and deflector wheel classifier. Applications include cocoa press cake, sugar, special flours and hydrocolloids. The integration of a mill and classifier in a single housing offers value-added benefits like easy cleaning, a simple construction and a compact milling plant.

The Classifier Mill CSM combines an impact grinding mechanism with an integrated dynamic air classifier. Using this air classifier, a very fine final fineness of less than 10 μm can be obtained, without the disadvantage of an external grinding and classifying circuit. The internal circulation of the coarse product in the classifier is self-adjusting, which ensures a steady, energy and space saving operation. The grinding is carried out between a peripheral milling track and the beating tools.

Thanks to the highly-developed classifier technology with a vertical classifier wheel, a rotationally symmetrical classification can be achieved, which guarantees a very high fineness with precise upper particle size limit, as well as an even loading of the classifier wheel. The easy to open machine housing enables fast and complete cleaning of the machine when products are changed.