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. 08, 2002
Filed:
Mar. 12, 2001
Juhani Vestola, Jyväskylä, FI;
Kari Niemi, Tikkakoski, FI;
Juha Wahlroos, Palokka, FI;
Pentti Lehtonen, Jyväskylä, FI;
Jorma Majava, Riihimäki, FI;
Jussi Tuomela, Järvenp{umlaut over (aa)}, FI;
Harri Kuosa, Järvenp{umlaut over (aa)}, FI;
Metso Paper, Inc., Helsinki, FI;
Abstract
A roll for use in the manufacture of paper and board, a press roll, in particular a center roll in a press, a backup roll for an extended-nip press roll, a hot press roll, or equivalent, which is in direct contact with a wet paper web, or a calender roll, a method for manufacturing the same and a coating composition therefor including an adhesion layer arranged on the frame part of the roll and a ceramic layer arranged on the adhesion layer. The ceramic layer has a thickness of from about 100 &mgr;m to about 2000 &mgr;m and includes from about 50% to about 95% by weight of Cr O and from about 3% to about 50% by weight of TiO , or from about 50% to about 80% by weight of Al O and from about 20% to about 50% by weight of ZrO , or exclusively Al TiO . The outer face of the ceramic layer is finished until the roughness Ra is from about 0.2 &mgr;m to about 2.0 &mgr;m and/or the porosity of the outer face of the roll is from about 1% to about 20%. In addition to or instead of TiO , the ceramic layer may contain oxides of aluminum, silicon, zirconium, magnesium, manganese, tin, tungsten and mixtures thereof.