Forces during bar-passing events in low consistency refining: Effects of refiner tram

摘要

A piezo-ceramic sensor was used to measure normal and tangential shear forces applied to a bar at one location in the refining zone of a Sunds Defibrator Conflo~® JC-00 conical refiner. Both the normal and shear force signals demonstrated significant periodicity, synchronous with the speed of rotor rotation. Force magnitudes vary by as much as a factor of 3 over one revolution. This periodicity was caused by rotor out-of-tram of only 0.06 mm.