Valmet Technologies, Inc.

Petri Ristola

Mika Viljanmaa

Pekka Linnonmaa

Reijo Pietikäinen

Jari Ilomäki

Jani Hakola

Pasi Kekko

Henri Vaittinen

Lauri Aaltio

Laura Savela

Arto Kumpulainen

Jouni Haavisto

Robert Havukainen

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

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Kerava, Finland

Petri Ristola