This paper aims to help the thermomechanical pulping (TMP) to attain the papermaking quality required for conical refiner. For this purpose, a hydrodynamic model was derived for pulp flow along the plate through analysis and calculation of the forces acting on the pulp in the refining zone of a high-consistency conical pulp refiner. The refiner contains both the conical refining zone and flat refining zone. In the refiner, the forces on the pulp come from two sources: the refiner plates and the interaction among fibres. Then, the author conducted a force analysis on the pulp in the refining zone based on hydrodynamics, and derived a set of equations for high-consistency conical refiner. The research findings greatly simplify the modelling process of pulping in high-consistency conical refiner.
