Method for eddy current heating a roll in a paper machine

Details Method for eddy current heating a roll in a paper machine Method for eddy current heating a roll in a paper machine

1983-12-12

1986-09-30

Alvo, Steve

Paper making and fiber liberation

Processes and products

Running or indefinite length work forming and/or treating...

29116AD, 100 93RP, H05B 614

Patent

active

046145656

ABSTRACT:
A method and apparatus for the inductive heating of a roll used in the manufacture of paper by means of eddy currents, such as the inductive heating of a calender roll. In the apparatus, pole shoe devices provided with electromagnetic coils are used, by means of which the eddy-current heating is applied only to the surface layer of the roll, the surface layer being constituted of ferromagnetic material, solely from outside the roll. The apparatus comprises several iron cores placed side by side and provided with magnetizing coils. Into each coil, a magnetizing current is passed, the magnetizing current being of adjustable intensity and/or frequency to control the temperature profile of the roll in the axial direction thereof.

REFERENCES:
patent: 3489344 (1970-01-01), Keyes
patent: 4384514 (1983-05-01), Larive et al.
patent: 4485540 (1984-12-01), Riihinen

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