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A comminution model parametrization for low consistency refining

Rubiano Berna, Jorge Enrique, Martinez, D. Mark, Olson, James A.
Powder technology 2018 v.328 pp. 288-299
cutting, geometry, models, powders, pulp, refining
Fibre shortening is typically an unwanted morphological change during low consistency refining that degrades pulp. A comminution model parametrization was proposed to assess fibre shortening during the low consistency refining of mechanical pulps. Fibre length distribution data from before and after refining with a variety of pulp types, net-powers, feed flow rates, angular velocities and plate geometries was analyzed. The estimated parameters from the comminution model showed to have correlations with refiner gap: the cutting rate had an inversely proportional power-law relationship with the refiner gap; narrower gaps promoted fibre cutting at the middle of the fibre whereas wider gaps promoted a more uniform cutting. Plate geometry was also demonstrated to have a role in the fibre cutting location. The proposed parametrization was compared to other modeling works using the likelihood ratio test, showing that it is appropriate to describe the results reported.