Patent ID: 8556202

Claim:
Roller mill, comprising a grinding pan rotatable about a mill axis, on a grinding track of the grinding pan stationarily disposed grinding rollers roll and thereby define with their circumferential surfaces on the grinding track a running circuit with an inner diameter D Wi and an outer diameter D Wa , a grinding material distributor for grinding material to be reduced, which grinding material distributor is disposed as an elevation in centre of the grinding pan coaxially with the mill axis, and a distributing plate is formed as the grinding material distributor having a horizontally arranged feed area for the grinding material and a diameter D ST at the level of the grinding track which satisfies the following mathematical relation: 80 mm≦½[ D Wi −D ST ]≦400 mm wherein, in the aforementioned mathematical relation, a lower value up to 80 mm is for a small roller mill having a grinding pan with a diameter of about 1.2 to 2.0 meters and a larger value up to 400 mm is for a large roller mill having a grinding pan with a diameter of about 2.1 to over 6 meters.