Hosokawa Alpine AG is expanding its product portfolio with a new classifier mill: the Alpine Dual Mill (ADM) combines the advantages of the existing ACM and ZPS classifier mill series from the machine and plant manufacturer from Augsburg and can be used more flexibly than any other classifier mill on the market.

The new mill enables the production of ultra-fine powders with an upper particle size in the single digit µm range. As it is also easy to clean, it is of particular interest to the chemical and food industries. The Alpine Dual Mill also scores highly in operation with its low pressure loss and energy-efficient grinding. 

Hosokawa Alpine will offer the Alpine Dual Mill ADM classifier mill in four different sizes. The new solution was presented for the first time on 23 September 2025 at Powtech Technopharm in Nuremberg. In addition to the variant for very fine products, Hosokawa Alpine will also offer a model for medium-fine products. 

In addition to the tried and tested classifier wheels, the Alpine Dual Mill ADM uses new and particularly fine separating classifier wheels. "The new classifier mill can be operated with three different classifier wheel geometries for specific requirements and maximum fineness, making the range of applications very flexible for our customers," emphasises Daniel Droop, Senior R&D Manager at Hosokawa Alpine. Compared to the ACM and ZPS classifier mills, the new mill achieves a higher throughput with the same installed drive power.

The mode of operation of the ADM is basically the same as that of the tried and tested ACM classifier mill. "Firstly, the material to be ground is fed into the ADM pneumatically or via a screw conveyor. Size reduction is then achieved by the impact of the ground material on the rotating grinding elements and on the stationary grinding track," explains Daniel Droop. With impact edge speeds of up to 135m/s, finenesses of d₉₇ below 7 µm are achieved. The processing air drawn through the mill by the downstream fan captures the material to be ground and guides it along the guide vanes of the guide cone in the grinding chamber.

The machine is characterised by its integrated dynamic classifier. The product-air mixture rectified by the guide vanes is fed evenly to the rotating classifier. In the classifying area, separation into coarse and fine material takes place due to two opposing forces and the different mass of the particles. The coarse product is rejected by the classifier wheel, returned to the grinding zone and is ground again. The fine product passes through the classifier wheel and exits the grinding chamber. The separation limit is set via the speed of the classifier wheel and can also be infinitely adjusted during grinding operation.

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