A general non-linear model of a disc refiner for the preparation of the raw material used in paper and board manufacture, from processed mechanical and chemical pulp, is derived. Thereafter, a linear description is constructed for analysis and process design purposes. The time domain responses of the models are presented for purposes of comparison and simulation is employed to confirm the predicted condition of torsional resonance. The effect of this excitation on the reciprocal shredding and shearing action of the machine is commented upon.
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