Abstract: A calendar wherein a bottom roll and a deformable top roll flank one or more intermediate rolls is operated in such a way that the shape of the top roll is caused to conform to that of the adjacent intermediate roll before the nip of the top roll with the adjacent roll is narrowed. At least the top roll is heated to enhance the satinizing effect upon paper webs without unduly affecting the specific volume of treated material. It is further proposed to subject the bottom roll to preliminary deformation and/or to heat the bottom roll and/or one or more intermediate rolls.