Fine Impact Mills

Principle:

UPM mechanical impact mills are designed for dry grinding soft to medium hard materials. The feed material is charged to the center of the rotor equipped with grinding elements and is comminuted by impact against the rotor and stator elements. After passing through the grinding zone, the product enters the mill housing and is then discharged from the mill by gravitational force. The rotation generates an air flow from which the end product is extracted and charged to a filter. Different grinding elements can be employed, e.g. Pin disc or a plate beater unit with profiled grinding track or a sieve grate. The fineness is set by adjusting the rotor speed and the feed rate.

Feature:

- typical area of application: degglomeration / milling for end product fineness of between 30 um and 1500 um.

- grinding of soft to medium hard materials

- highly versatile thanks to different grinding elements

- cooling effect thanks to high air flow

- end products are low in fines

Model:

Max. Values, depending on grinding tools

Max. Speed, depending on grinding tools

Application:

Fine impact mills are used for fine and ultrafine grinding. Depending on the product, these mills cover a fineness range of between appr. 30um and 500um. As this type can be used with different grinding elements, it is very versatile. Thanks to the rotor’s ventilation effect, the product is conveyed and cooled at the same time. The end products are low in fines and have good flow properties.

Versatility:

- Pin discs - for very high end product fineness or for homogenization.

- Plate beater unit - cooling effect thanks to higher air flow

- plate beater unit with sieve ring - particle size limitation with low fines content

- plate beater unit with grinding track - comminution of hard material

- combination of grinding track and sieve for better particle size control

- grinding track available in different geometries for optimization