Method for heating of a roll and a heatable roll

Claim 2

A heated roll for a paper machine, comprising: (a) a rotatable hollow cylindrical roll mantle having an axis of rotation, an axial length, an inner diameter, an inner surface, an outer surface and conduits formed as drill holes between said inner and outer surfaces, and beneath said outer surface of said roll mantle so as to extend axially over the axial length of the roll mantle; (b) a plurality of electrical heaters located in said holes for receiving electrical power and heating said roll mantle, said plurality of electrical heaters being located in said roll mantle so as to form a plurality of separate independently controllable heating zones so that different heating effects may be produced on said outer mantle surface at each of said heating zones, each of the heating zones extending completely around said roll mantle and extending along a portion of the axial length of said roll mantle; (c) a nonrotating axle, having a diameter smaller than said inner diameter and a central axis, said central axis being aligned with said axis of rotation; (d) a bearing, for rotatably supporting said roll mantle on said axle; and (e) an electrical contact means for receiving electrical power for said plurality of electrical heaters while said mantle rotates about said axle.

Claim 3

A heated roll according to claim 1, wherein said electrical heaters are electrical resistors.

Claim 4

A heated roll according to claim 1, wherein said electrical heaters are located in said mantle at a position closer to said outer surface of said mantle than said inner surface of said mantle.

Claim 5

A heated roll according to claim 2, wherein said electric contact means comprises a glide ring electrically connected to said electrical resistors, wherein said glide ring is located at an end of said mantle.

Claim 6

A heated roll according to claim 1, wherein said roll mantle comprises a variable crown roll mantle and said roll further comprises means for adjusting a profile of said variable crown roll mantle.

Claim 7

A heated roll according to claim 5, wherein said adjusting means comprise a plurality of hydraulic actuators.

Claim 8

A roll mantle for use in a paper machine having a stationary axle, said mantle comprising a hollow cylindrical tube having an axial length, an inner surface and an outer surface, and a plurality of conduits formed as drilled holes between said inner and outer surfaces, and beneath said outer surface so as to extend axially over the axial length of the tube, a plurality of electrical heaters located in said holes for receiving electrical power and heating said roll mantle, said plurality of electrical heaters being located in said roll mantle so as to form a plurality of separate independently controllable heating zones so that different heating effects may be produced on said outer mantle surface at each of said heating zones, each of the heating zones extending completely around said roll mantle and extending along a portion of the axial length of said roll mantle, and means for receiving electrical power and supplying it to said heaters, said roll mantle being adapted for rotational mounting about the axle.

Claim 9

A roll mantle for use in a paper machine having a stationary axle, said mantle comprising a hollow cylindrical tube having an axial length, an inner surface and an outer surface, and a plurality of conduits formed as drilled holes between said inner and outer surfaces, and beneath said outer surface so as to extend axially over the axial length of the tube, a plurality of electrical heaters located in said holes for receiving electrical power and heating said roll mantle, said plurality of electrical heaters being located in said roll mantle so as to form a plurality of separate independently controllable heating zones so that different heating effects may be produced on said outer mantle surface at each of said heating zones, each of the heating zones extending completely around said roll mantle and extending along a portion of the axial length of said roll mantle, and means for receiving electrical power and supplying it to said heaters, said roll mantle being adapted for rotational mounting about the axle.

Claim 10

A roll mantle according to claim 7, wherein said hollow cylindrical tube comprises a variable crown roll mantle.

Claim 11

A roll mantle according to claim 7, wherein said electrical heaters are located closer to said outer surface than said inner surface.

Claim 14

A method for heating a press roll or a calender roll in a paper machine according to claim 10, wherein at least one of said heating zones is heated to a different extent than another of said heating zones.

Claim 15

A method for heating a press roll on a calender roll according to claim 10, wherein the electrical power is adjusted by varying an input voltage to the electrical heaters.

Claim 16

A method for heating a press roll on a calender roll according to claim 10, wherein the electrical power is adjusted by varying an input waveform to the electrical heaters.

Claim 17

A heated roll for a paper machine, comprising: (a) a rotatable hollow cylindrical roll mantle having an axis of rotation, an axial length, an inner diameter, an inner surface and outer surface and conduits formed as drill holes between said inner and outer surfaces, and beneath said outer surface of said roll mantle so as to extend axially over the axial length of the roll mantle; (b) a plurality of separate independently controllable heating zones extending completely around said mantle and extending along a portion of the axial length of said mantle, each heating zone comprising a plurality of electrical heaters located in said holes for receiving electrical power and for heating said zone of said roll mantle, and an electric contact means, so that said heaters in each of said heating zones may independently dissipate an amount of electric power so that different heating effects may be produced on said outer mantle surface at each of said heating zones; (c) a stationary axle, having a diameter smaller than said inner diameter and a central axis, said central axis being aligned with said axis of rotation; (d) a bearing, for rotatably supporting said roll mantle on said axle; and (e) an electrical contact means for receiving electrical power for said plurality of electrical heaters while said mantle rotates about said axle.

Claim 18

A heated roll for a paper machine, comprising: (a) a rotatable hollow cylindrical roll mantle having an axis of rotation, an axial length, an inner diameter, an inner surface and outer surface and conduits formed as drill holes between said inner and outer surfaces, and beneath said outer surface of said roll mantle so as to extend axially over the axial length of the roll mantle; (b) a plurality of separate independently controllable heating zones extending completely around said mantle and extending along a portion of the axial length of said mantle, each heating zone comprising a plurality of electrical heaters located in said holes for receiving electrical power and for heating said zone of said roll mantle, and an electric contact means, so that said heaters in each of said heating zones may independently dissipate an amount of electric power so that different heating effects may be produced on said outer mantle surface at each of said heating zones; (c) a stationary axle, having a diameter smaller than said inner diameter and a central axis, said central axis being aligned with said axis of rotation; (d) a bearing, for rotatably supporting said roll mantle on said axle; and (e) an electrical contact means for receiving electrical power for said plurality of electrical heaters while said mantle rotates about said axle.

Claim 19

A rotational roll mantle for use in a paper machine having nonrotating crown variation means, said rotational roll mantle comprising a variable crown roll mantle having a hollow cylindrical tube, an axial length, an inner surface and an outer surface and a plurality of conduits formed as drilled holes between said inner and outer surfaces, and beneath said outer surface so as to extend axially over the axial length of the mantle, a plurality of electrical heaters located in said holes for receiving electrical power and heating said roll mantle, said plurality of electrical heaters being located in said roll mantle so as to form a plurality of separate independently controllable heating zones so that different heating effects may be produced on said outer mantle surface at each of said heating zones, each of the heating zones extending completely around said roll mantle and extending along a portion of the axial length of said roll mantle, and means for receiving electrical power and supplying it to said heaters, said rotational roll mantle being adapted for placement outside the nonrotating crown variation means.

Claim 20

A rotational roll mantle for use in a paper machine having nonrotating crown variation means, said rotational roll mantle comprising a variable crown roll mantle having a hollow cylindrical tube, an axial length, an inner surface and an outer surface and a plurality of conduits formed as drilled holes between said inner and outer surfaces, and beneath said outer surface so as to extend axially over the axial length of the mantle, a plurality of electrical heaters located in said holes for receiving electrical power and heating said roll mantle, said plurality of electrical heaters being located in said roll mantle so as to form a plurality of separate independently controllable heating zones so that different heating effects may be produced on said outer mantle surface at each of said heating zones, each of the heating zones extending completely around said roll mantle and extending along a portion of the axial length of said roll mantle, and means for receiving electrical power and supplying it to said heaters, said rotational roll mantle being adapted for placement outside the nonrotating crown variation means.

Claim 21

A heated roll according to claim 1, wherein the conduits extend axially, substantially parallel to the axis of rotation of said mantle.

Claim 22

A heated roll according to claim 1, wherein the conduits extend in spirals about the axis of rotation of said mantle.

Claim 23

A roll mantle according to claim 7, wherein the conduits extend axially, substantially parallel to the axis.

Claim 24

A roll mantle according to claim 7, wherein the conduits extend in spirals about the axis.

Claim 25

A method for heating a press roll or a calender roll in a paper machine according to claim 10, wherein the conduits extend axially, substantially parallel to an axis of said mantle.

Claim 26

A method for heating a press roll or a calender roll in a paper machine according to claim 10, wherein the conduits extend in spirals about an axis of said mantle.

Claim 27

A heated roll according to claim 14, wherein the conduits extend axially, substantially parallel to the axis of rotation of said mantle.

Claim 28

A heated roll according to claim 14, wherein the conduits extend in spirals about the axis of rotation of said mantle.

Claim 29

A rotational roll mantle according to claim 15, wherein the conduits extend axially, substantially parallel to an axis of said mantle.

Claim 30

A rotational roll mantle according to claim 15, wherein the conduits extend in spirals about an axis of said mantle.