Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1989-04-13
1990-08-14
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162206, 162358, 162359, 1623601, 100 38, 219 10492, 219 1061A, D21F 300
Patent
active
049484664
ABSTRACT:
Method and arrangement in a machine for the manufacture of paper or board, for heating an outer face of a cylinder or roll which is in direct contact with a web to be pressed thereagainst. The cylinder or roll face is heated from outside inductively by using a magnetic field, and by which a heating effect based on eddy currents is produced in the outer layer of the roll or cylinder. A relatively thin outer layer of an electrically conductive ceramic material is used as the cylinder or roll face, in which the resistive heating effect is concentrated. The depth of penetration of the heating effect in the radial direction of the roll of cylinder to be heated is restricted to a sufficiently low depth by choosing the thickness of the ceramic outer layer and/or the electric frequency of the induction heating. Additionally, on the basis of its electrical properties, the ceramic material of the outer layer is chosen so that the cylinder or roll face is provided with the necessary properties of strength, and is also chosen in view of the thermal shock of the heating effect.
REFERENCES:
patent: 4324613 (1982-04-01), Wahren
patent: 4631794 (1986-12-01), Rihinen
patent: 4653395 (1987-03-01), Verkasalo
patent: 4675487 (1987-06-01), Verkasalo
patent: 4704776 (1987-11-01), Watanabe et al.
patent: 4796342 (1989-01-01), Mihkiren
patent: 4830683 (1989-05-01), Fergusson
Hastings Karen M.
Valmet Paper Machinery Inc.
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