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

A method for modernizing a multiroll calender for a fiber web, a paper web, or a board web, the method comprising:

• modifying at least one stack of calender rollers, wherein the stack of calender rolls comprises at least two calender rolls and at least one of the calender rolls is a smooth-surfaced press roll of a selected diameter and maintained at a selected surface temperature with a source of heading fluid of a first selected temperature, by removing the at least one smooth-surfaced press roll and replacing it with an ultra thermo roll having flow channels for the heating fluid, the ultra thermo roll defining an axial direction, and having an outer surface of an outer layer of a mantle part and a roll diameter which is substantially no larger than the selected diameter of the smooth-surfaced press roll which is removed;
• and
• maintaining a surface temperature of the ultra thermo roll by heating the outer surface with the source of heating fluid at the first selected temperature to at least 110° C.;
• wherein the ultra thermo roll is configured with thermal transfer properties such that the outer surface temperature of the ultra thermo roll is at least 10° C. higher than the selected surface temperature of the smooth-surfaced press roll which has been replaced employing the source of heating fluid with the first selected temperature.