Patent ID: 6502774
Filing Date: 2003-01-07
Classification: B02C,D21D

Abstract:
A rotary disk refiner for refining fibrous pulp in a liquid stock comprising:a housing having a stock inlet; a rotor within the housing that rotates about an axis of rotation during operation; a refiner disk mounting surface within the housing that opposes the rotor; a first refiner disk carried by the rotor, the first refiner disk comprised of a plurality of pairs of upraised bars that define grooves therebetween that collectively form a first refining surface; a second refiner disk carried by the refiner disk mounting surface, the second refiner disk comprised of a plurality of pairs of upraised refiner bars that define refiner grooves therebetween that collectively form a second refining surface, wherein the second refiner disk opposes and is spaced from the first refiner disk, and wherein a refining zone is defined between the opposed refining surfaces of the first and second refiner disks; a tubular spacer disposed in the refining surface of one of the first and second refiner disks; and a sensor carried by the spacer, the sensor comprising a sensor housing received in the spacer, the sensor housing having a tip that extends beyond the spacer toward the refining zone and that contacts stock in the refining zone, and a sensing element disposed in the housing that outputs a signal that relates to a characteristic of the stock in the refining zone.