Method and device for induction heating a roll
AssigneeMetso Automation Oy
InventorRisto Säynäväjärvi
Life of this patent
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Abstract
A device for heating a roll in a paper or paperboard machine or in a finishing machine for paper or paperboard the device including a profiling induction heater (5) which is arranged to heat the roll (3) with a power dependent on the location of the point to be heated in the axial direction of the roll, and a non-profiling induction heater (4) which, to provide basic heating, is arranged to heat the same roll (3) with a heating power which is substantially even over the width of the roll (3). The profiling induction heater (5) and the non-profiling induction heater (4) are placed in the same support structure (1) outside the roll (3). The roll (3) is a calender roll.
Claims10
A method for heating a roll in a paper or paperboard machine or in a finishing machine for paper or paperboard comprising the steps:
- providing a profiling induction heater;
- heating the roll by means of said profiling induction heater at different points along the axial direction of the roll with different amounts of power to achieve a profiling induction heating;
- providing a non-profiling heater;
- heating outside the roll (3), by means of said non-profiling heater, using heating power which is substantially even over the width of the roll;
- and
- wherein said profiling induction heater and said non-profiling heater are both placed in the same support structure (1).
A device for heating a roll in a paper or paperboard machine or in a finishing machine for paper or paperboard comprising:
- a profiling induction heater (5) which is arranged to heat the roll (3) with a power dependent on the location of the point to be heated in the axial direction of the roll,
- a non-profiling heater (4) placed outside the roll and arranged to heat the same roll (3) with a heating power which is substantially even over the whole width of the roll;
- and
- wherein both of the heaters (4, 5) are placed in the same support structure (1).
A method for rebuilding the heating system in a paper or paperboard machine or in a finishing machine for paper or paperboard, wherein the heating system comprises a profiling induction heater (5) which is arranged to heat the roll (3) with a power dependent on the location of the point to be heated in the axial direction of the roll, said method for rebuilding comprising the steps of:
- supplementing the heating system with a non-profiling heater (4), which is placed outside the roll and is arranged to heat the same roll (3) with a heating power which is substantially even over the whole width of the roll;
- and
- wherein the non-profiling heater (4) is integrated in an existing support structure (1) for the profiling induction heater (5).
Dependencies are inferred from the claim text.