Method and apparatus for controlling thickness of a web in a cal

Details Method and apparatus for controlling thickness of a web in a cal Method and apparatus for controlling thickness of a web in a cal

1986-10-28

1988-10-04

Paschall, M. H.

Electric heating

Metal heating

Of cylinders

219 1043, 219 1071, 219 1077, H05B 610

Patent

active

047757736

ABSTRACT:
Method and apparatus for controlling the thickness profile of a web passing through a calendering nip formed by two rolls, in which a variable magnetic flux is directed onto an outer surface on one of the rolls 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, with the magnetic flux acting to induce eddy currents along the surface of the roll, generating heat thereon. The roll diameter is changed over the length of the roll in a manner corresponding to the axial temperature profile of the roll, with the changes in diameter of the roll in turn determining the pressure profile across the calendering nip, and thereby determining the thickness profile of the web passing therethrough.

REFERENCES:
patent: 2761941 (1956-09-01), Ardichvili
patent: 3444346 (1969-05-01), Russell et al.
patent: 3525842 (1970-08-01), Steinhoff et al.
patent: 3702912 (1972-11-01), Greenberger
patent: 4258241 (1981-03-01), Soworowski
patent: 4321444 (1982-03-01), Davies
patent: 4350861 (1982-09-01), Pouillange et al.
patent: 4384514 (1983-05-01), Larive et al.
patent: 4425489 (1984-01-01), Pav et al.
patent: 4472616 (1984-09-01), Maurice et al.
patent: 4621177 (1986-11-01), Pulkowski et al.

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