METHOD AND DEVICE FOR ELECTROMAGNETIC HEATING OF A ROLL, IN PARTICULAR OF A CALENDER ROLL, USED IN THE MANUFACTURE OF PAPER OR OF SOME OTHER WEB-FORMED PRODUCT

摘要

PCT No. PCT/FI84/00070 Sec. 371 Date Apr. 29, 1985 Sec. 102(e) Date Apr. 29, 1985 PCT Filed Oct. 2, 1984 PCT Pub. No. WO85/01532 PCT Pub. Date Apr. 11, 1985.Apparatus and method for electromagnetic heating of a roll by induction, in which a variable magnetic flux is directed into an outer surface of the roll from a magnetic shoe device comprising a plurality of cores situated externally of the roll and over substantially the entire axial length thereof. Each core is spaced a discrete distance from the roll surface. The magnetic flux acts to induce eddy currents along the surface of the roll, thus generating heat thereon.