Patent ID: 7010988

Claim:
A method of measuring stress forces in refiners including a pair of relatively rotatable refining disks juxtaposed with a refining gap therebetween for refining material within said refining gap, each of said pair of refining disks including a refining surface and a plurality of refining bars extending across said refining surface, and a measuring surface comprising a predetermined portion of said refining surface of at least one of said refining disks including at least a portion of a plurality of said refining bars, said measuring surface being movably mounted on said surface of said at least one refining disk, and a pair of rigidly mounted force sensors for producing oppositely directed deflections when said measuring surface is influenced by stress forces, said method comprising resiliently mounting said measuring surface in a direction parallel to said surface of said at least one refining disk and calculating said stress force based on the difference between the deflections measured by said respective pairs of said force sensors.