초록 ▼

A method for controlling the transverse thickness profile of paper or other web-like product by controlling temperature, including the axial temperature profile, of the mantle of a roll forming a nip with another roll in the manufacture of the paper or other web-like product includes forming a layer

A method for controlling the transverse thickness profile of paper or other web-like product by controlling temperature, including the axial temperature profile, of the mantle of a roll forming a nip with another roll in the manufacture of the paper or other web-like product includes forming a layer of heat transfer liquid on the inner surface of the mantle under the effect of the centrifugal forces generated by the rotation of the mantle, the layer of heat transfer liquid being divided into separate annular sections, and controlling the temperature of the heat transfer liquid layer of each of the sections. A roll in accordance with the invention includes a cylindrical outer mantle rotatably mounted at its axial ends, a stationary inner shaft situated within the mantle and partitions for dividing a layer of heat transfer liquid formed on the inner surface of the mantle into a plurality of separate annular sections. The temperature of the heat transfer liquid layer of each of the sections is controlled through the circulation of the heat transfer liquid of each section or through the provision of heat transfer elements in respective sections.

대표청구항 ▼

A method for controlling the thickness profile of a web passing through a nip formed between two rolls, one of the rolls including a stationary shaft having an outer surface and a rotatable hollow mantle having an inner surface spaced from the outer surface of the shaft and an outer surface comprisi

A method for controlling the thickness profile of a web passing through a nip formed between two rolls, one of the rolls including a stationary shaft having an outer surface and a rotatable hollow mantle having an inner surface spaced from the outer surface of the shaft and an outer surface comprising the roll surface, comprising the steps of: forming a plurality of separate axially adjacent heat transfer liquid layers within said roll mantle in heat transfer relationship with corresponding axial sections of the inner surface of said roll mantle and spaced from the outer surface of the shaft; providing means for controlling the temperature of the heat transfer liquid of each heat transfer liquid layer; controlling the temperature of the heat transfer liquid of each heat transfer liquid layer in accordance with a desired thickness profile of the web, such that the diameters of axial regions of the roll mantle corresponding to the axial inner surface sections which are in heat transfer relationship with the heat transfer liquid sections expand or contract by thermal expansion or contraction; the extent of expansion or contraction of the diameter of each axial roll mantle region determined by the temperature of the heat transfer liquid section corresponding thereto. 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.