Electric heating – Metal heating – Of cylinders
Patent
1985-03-27
1986-11-04
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1061A, 219 1071, 219 1079, 219 1043, 100 92, H05B 640
Patent
active
046211772
ABSTRACT:
Inductors for heating rolls especially of the type used in rolling mills for sheet materials such as paper, textiles, plastics and the like, are configured to enhance and concentrate eddy currents in areas along the length of the roll to selectively heat the roll as desired and control moisture and caliper properties of the sheet. The inductors have cores with a center leg around which the exciting coil is wound and an outer leg surrounding the coil and connected at one end to the inner leg. These inductors or electromagnets are mounted immediately adjacent a roll of magnetic flux conducting material, such as iron or steel, to heat the roll surface as desired across the length of the roll as it is rotated through the concentrated electromagnetic field generated by the inductor. The magnetic field or flux is concentrated in an annular zone and passes between the nested inner and outer legs of the core through the roll without travelling through a wide air gap and the desired roll temperatures are achieved with minimum current input to the coil. The air gap may be varied in the cross machine direction and the excitation of the inductors may be varied to induce or compensate for temperature variations across the roll.
REFERENCES:
patent: 1912214 (1933-05-01), Northrup
patent: 2761941 (1956-09-01), Ardichvili
patent: 4304975 (1981-12-01), Lenk et al.
patent: 4371768 (1983-02-01), Pozna
patent: 4384514 (1983-05-01), Larive et al.
patent: 4425489 (1984-01-01), Pav et al.
patent: 4486962 (1984-12-01), Wedel
Publication in "Rubber World" Feb., 1954, pp. 621 and 622.
British Plastics Journal Nov. 1953, pp. 400 and 401.
Related application filed by assignee-Udiono Stedile Ser. No. 386,864, filed Jun. 10, 1982 claiming Convention filing date of Italian Application No. 67827-A/81, filed Jun. 16, 1981.
Pulkowski Jeffrey H.
Siler Steven J.
Beloit Corporation
Leung Philip H.
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