Method and device for indicating the contact position in a refiner

Abstract From the Canadian patent

In a disc refiner with two opposed refining discs (1,2) rotary relative to each other the contact position for the refining surfaces (9,10) is indicated. The refining discs (1,2) are moved against each other during relative rotation whereby the first contact of the refining surfaces (9,10) with each other generates a heat radiation, which is detected by a transmitter (15). The place of detection is radially outside the refining discs (1,2) in a refiner housing (12) enclosing the refining discs. Said transmitter emits an output signal which is utilized, for determining the contact position.