Roll with heated mantle and method

A roll for use in controlling the thickness profile of a paper web passing through a calendering nip formed by said roll and a counter-roll, comprising

• a cylindrical outer mantle rotatably mounted at its axial ends, said mantle having inner and outer surfaces;
• a stationary shaft situated within said mantle;
• means for forming a layer of heat transfer liquid on said inner surface of said mantle;
• partition means connected to said inner surface of said mantle for dividing said liquid layer into a plurality of separate annular sections in the axial direction of said roll mantle, said sections of heat transfer liquid being in heat transfer relationship with corresponding axial regions of said roll mantle;
• means for controlling the temperature of the heat transfer liquid layer of each of said sections;
• the diameter of each of said axial roll mantle regions being thermally expandable or contractable based upon heat transferred between each heat transfer liquid section and corresponding roll mantle region,
• whereby pressure applied in said nip is adjustable over the axial direction thereof, based upon changes in said roll diameter effected by said temperature controlling means, and
• the thickness profile of the web passing through the nip being thus controlled by the axial pressure profile applied in the nip.