Method and device for heating a roll

摘要

In the method for heating a roll in a paper or paperboard machine or finishing machine for paper or paperboard, several adjacent induction coils (2) are used which are located at different points in the axial direction of the roll, and said induction coils are made to move back and forth in the axial direction of the roll with respect to the roll (3) to be heated. The movement is utilized to even out such an irregular power distribution and correspondingly uneven heating response in the axial direction of the roll which result from the structure and/or mutual location of individual coils, and it can be used e.g. for profiled induction heating of a calender roll.