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On High-Frequency Self-Excitation in Paper Calenders

Brommundt E.

Machine Dynamics Research

2011

Vol. 35, No. 4

5-10

Oscillations at the nip of paper calenders spoil the quality of the paper, cross streaks – bars - occur, the machine will suffer damage. The paper outlines briefly the results of Brommundt (2009). The stability of the stationary motion of a machine with ideally circular elastic rolls is investigated. The paper compression in the nip has a hysteretic characteristic, for the small slip between rolls and paper holds a Coulomb type friction. Two thick-walled hollow cylinders serve as rolls. With respect to polar coordinates, in the unstable, the self-oscillating nonlinear system the third and second order Fourier terms of the noncircular deformation get the largest amplitudes. Thus, the frequency of the selfoscillation lies far above the basic critical frequencies of the rolls in their suspensions. The model can be applied to select stabilizing parameter variations.