Calender, for finishing a paper web, has an oscillation sensor assembly linked to magnetic field generators at least at a pair of rollers, to correct any oscillations and prevent marking the web with stripes

摘要

Calender (1), with a vertical stack of rollers (2-6), has a sensor assembly (25) which registers oscillation at least at one roller (5). At least one roller (3,4) has a controlled magnetic field generator (21,23) which develops a magnetic field at least at one neighboring roller according to the sensor signals. The magnetic forces are directed in the press direction.