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. 20, 1998
Filed:
Jun. 24, 1996
Alfred C Li, Napierville, IL (US);
Pamela K Hynnek, Rockton, IL (US);
James P Alfano, Janesville, WI (US);
Xuekui Lan, Roscoe, IL (US);
Rex A Becker, Janesville, WI (US);
Beloit Technologies, Inc., Wilmington, DE (US);
Abstract
A method and apparatus for coating a traveling paper web includes a coating applicator disposed in movably-controlled spaced adjacency with the paper web, which is supported on a rotating backing roll. The coating applicator permits a controlled introduction of a fresh portion of an aqueous slurry of coating material which is mixed with a recirculated portion of coating material in a controlled manner to prevent the formation of large vortices within the coating applicator. The coating material flows successively through mixing, convergent, and recirculation channels, all of which are defined on one side thereof by a distinct surface of a flow stabilizer which is positioned centrally in a cavity in the coating apparatus. Control of the supply of the coating material through the inlet nozzle, and the recirculation of the coating material between the recirculation and mixing channels, through a recirculation nozzle, is effected by directing the coating material through a plurality of orifices which provide a controlled back pressure in the coating material as well as to disrupt the propagation of cross-machine vortices in the coating material. The paper web is brought into contact with the coating material along a convergent channel where the coating material is carried by the traveling web over the backing roll and where the flow variation in the coating material in the convergent channel is controlled at a small-scale level. A metering blade is positioned downstream of the convergent channel to bear against the coating over the web and meter the coating onto the traveling paper web.