Patent ID: 7520460
Filing Date: 2009-04-21
Classification: B02C,D21D

Abstract:
1. 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 terminate at axial outer bar surfaces and 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 terminate at axial outer bar surfaces and 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; and a sensor disposed in the refining surface of one of the first and second refiner disks within an associated one of the refiner grooves, the sensor having a tip disposed for contact by stock passing through said associated refiner groove that is offset below the axial outer bar surface of one of the refiner bars adjacent to the associated refiner groove, and wherein the sensor senses a characteristic of stock in the refining zone.