Roller crusher and a method for operating the same

A roller crusher having two parallel rollers arranged to rotate in opposite directions, and separated by a gap, each roller having two ends, the roller crusher comprising:

• a flange attached to an end of one of the two rollers,
• the flange extending in a radial direction of the roller, and
• the flange having an extension (H) past an envelope surface of the roller, wherein the roller crusher further comprises a material removal device, comprising:
• a rotatable cutter unit having a plurality of cutter elements arranged tangentially about the rotatable cutter unit at a respective radial distance from a rotational axis of the rotatable cutter unit;
• and
• a rotation device arranged to rotate the rotatable cutter unit,
• wherein the rotatable cutter unit is arranged at the end of one of the two rollers having the flange and thereby, when the rotatable cutter unit being rotated by the rotation device, at least partially allow cutting away material accumulated on the flange and/or on the envelope surface at an end portion of the roller adjacent the flange,
• wherein each cutter element of the plurality of cutter elements presents an impact surface arranged to face the material to be cut away, and
• wherein the impact surface comprises a polycrystalline diamond (PCD).