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:
Apr. 22, 2003
Filed:
Jun. 10, 2002
Juhana Lumiala, Jyväskylä, FI;
Hannu Lepomäki, Laukaa, FI;
Petri Jetsu, Vaajakoski, FI;
Petri Nyberg, Jyväskylä, FI;
Hannu Karema, Jyväskylä, FI;
Markku Kellomäki, Haapaniemi, FI;
Juha Salmela, Jyskä, FI;
Metso Paper, Inc., Helsinki, FI;
Abstract
A headbox ( ) has a stock inlet header, a tube bank, a tubulence generator and a slice channel. Measurement targets (P , P , P , P, P ) are provided with means for making measurements of the fiber mobility of the fiber suspension, then controlling the flow state of the suspension. Sensors on the width of the headbox ( ) or traversing sensors are positioned on different width points of the headbox ( ) and arranged to measure the fiber mobility profile, with means for changing the flow state on the basis of the measurements. Apparatus for diluting the thick stock into headbox consistency and units for cleaning the stock to be fed into the headbox may be provided. Sensors may be disposed in the short circulation pipes or cleaning units arranged to measure the fiber mobility of the fiber suspension with means for changing the flow state on the basis of the measurement data.