Yankee drier for paper production

Abstract

A Yankee drier for paper production including a body having a metal mantle with circular cross-section and two side heads on which are formed or mounted two respective coaxial pins arranged along a rotation axis of the Yankee, the body being configured to rotate with a predetermined angular speed around the rotation axis. Inside the body is arranged a fixed electromagnetic induction heating system comprising one or more inductors interacting electromagnetically with the mantle to produce induced electric currents in the same mantle, the one or more inductors being arranged near the radially innermost surface of the mantle.

1 - 12 . (canceled) 
     
     
         13 . A Yankee drier for paper production comprising: a body comprising a metal mantle with circular cross-section and two side heads on which are formed or mounted two respective coaxial pins arranged along a rotation axis of the Yankee, said body configured to rotate with a predetermined angular speed around said rotation axis, wherein inside said body is arranged a fixed electromagnetic induction heating system comprising one or more inductors interacting electromagnetically with the mantle to produce induced electric currents in the same mantle, said one or more inductors being arranged near the radially innermost surface of the mantle. 
     
     
         14 . The Yankee drier according to  claim 13 , further comprising an external diameter of the drier between 2.00 m and 7.500 m, and the mantle has an axial length between 3.00 m and 7.400 m. 
     
     
         15 . The Yankee drier according to  claim 13 , wherein the electromagnetic induction heating system extends axially, parallel to the rotation axis of the Yankee, along the inner surface of the mantle, but the electromagnetic induction heating system is shorter than the mantle, leaving a free space in front of each of the heads. 
     
     
         16 . The Yankee drier according to  claim 13 , wherein the radially outermost side of the electromagnetic induction system is at a radial distance from the internal surface of the mantle between 20 cm and 1 mm. 
     
     
         17 . The Yankee drier according to  claim 13 , wherein the electromagnetic induction system comprises an inductor in the form of a solenoid developed around the rotational axis of the Yankee, the solenoid being formed by coils concentric to said rotational axis. 
     
     
         18 . The Yankee according to  claim 13 , wherein the electromagnetic induction system comprises a single toroidal inductor formed by coils developed parallel to the axis of the Yankee. 
     
     
         19 . The Yankee drier according to  claim 13 , wherein the electromagnetic induction system includes a plurality of inductors, each of which includes a solenoid developed around the axis of the Yankee and formed by coils concentric to said axis. 
     
     
         20 . The Yankee drier according to  claim 13 , wherein the electromagnetic induction system comprises a plurality of inductors axially placed side by side. 
     
     
         21 . The Yankee drier according to  claim 13 , wherein the electromagnetic induction system comprises a plurality of inductors, each of which comprises a solenoid formed by coils wound around respective radial axes. 
     
     
         22 . The Yankee drier according to  claim 13 , wherein the electromagnetic induction system comprises a plurality of inductors arranged circumferentially around the axis of the Yankee. 
     
     
         23 . The Yankee drier according to  claim 17 , wherein the inductor is at a radial distance from the inner surface of the mantle, the inductor is formed by coils comprising conductors with a predefined diameter spaced apart by a pitch of predefined value, wherein the value of the said radial distance is less than or equal to the difference between said pitch and said diameter. 
     
     
         24 . The Yankee drier according to  claim 17 , wherein the inductor has a side radially closer to the mantle and a side radially more distant from the mantle, in which said side radially closest to the mantle is at a radial distance from the inner surface of the mantle, the inductors are formed by coils made up of conductors of predefined diameter spaced from each other by a pitch of predefined value, and the value of said radial distance is less than or equal to the difference between said pitch and said diameter.