Fine Grinding
For very fine grinding < 10 μm of dry plant material we use a device made up of a cylindrical rotor turning at 3 000 rev.mn − 1 in a stator with a slightly bigger diameter. Rotor and stator surfaces are equipped with parallel corrugations along the vertical axle. Fines are pulled toward the top. Pin mills have two discs equipped with pins that are parallel to their axle. One
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