Valmet Technologies, Inc.

Metso Paper Inc.

Lauri Aaltio

Mika Viljanmaa

Pekka Linnonmaa

Risto Väätänen

Jani Hakola

Arto Kumpulainen

Petri Ristola

Laura Savela

Jyrki Buller

A method for modernizing a existing multiroll calender, having at least one stack of calender rolls (), each stack comprising at least two calender rolls () and at least one of the calender rolls being a smooth-surfaced press-roll (). In an existing multiroll calender the smooth-surfaced press roll () is replaced by an ultra thermo roll that is a thermo roll with a diameter substantially the same or less than the thermo roll to be replaced, so that the surface temperature of the ultra thermo roll when heated is at least 110&#xb0; C., and has at least 10&#xb0; C. higher than the surface temperature of the existing roll with the same heating fluid temperature and having flow channels arranged in such a way that vibration excitation is minimized, by being arranged to form a spiral geometry in the mantle.

Method for modernizing a multiroll calender, in particular for modernizing a supercalender and a modernized multiroll calender, in particular a modernized supercalender

Growing community of inventors

Järvenpää, Finland

Lauri Aaltio