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:
Nov. 27, 2001
Filed:
Dec. 26, 1997
Jorma Snellman, Jyväskylä, FI;
Antti Poikolainen, Jyväskylä, FI;
Ari Puurtinen, Jyväskylä, FI;
Samppa Salminen, Jyväskylä, FI;
Valmet Corporation, Helsinki, FI;
Abstract
A suction box in a paper machine including a vacuum chamber, a deck or a number of substantially U-section holders open toward a wire and ribs arranged in the deck or the holders so that they can be loaded against the wire. At least in a running situation, the deck of the suction box is curved or the ribs are arranged to provide a curve run of the wire so that the wire tension of the curved run over the deck or ribs serves to lower a normal force which is produced by the vacuum present in the suction box and which is effective between the wire and the deck or ribs. A method in a suction box in a paper machine, wherein a vacuum is formed in a vacuum chamber of the suction box and, during formation of the vacuum, the deck and/or the ribs is/are pressed against the wire. At least in a running situation, the curve form of the deck of the suction box or the position of the ribs is such that the tension of the wire running over the deck or ribs lowers the normal force which is produced by the vacuum present in the suction box and which is effective between the wire and the deck/ribs.