The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 1988
Filed:
Oct. 28, 1986
Matti Verkasalo, Jyvaskyla, FI;
Valmet Oy, , FI;
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.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile