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:
Mar. 30, 2004
Filed:
Apr. 12, 2002
Helena Leppäkoski, Lempäälä, FI;
Pekka Koivukunnas, Järvenpää, FI;
Kari Hasanen, Kerava, FI;
Timo Torvi, Helsinki, FI;
Petteri Venetjoki, Helsinki, FI;
Metso Paper, Inc., Helsinki, FI;
Abstract
The present invention relates to a method for calendering a moving web ( ) of paper or board. The web ( ) is passed to a calender ( ) and calendered therein. At least one quality of the calendered web ( ) is measured at a first measurement point ( ) adapted at a location downstream from the calender ( ). Additionally, at least one quality of the web ( ) entering the calender ( ) is measured at a second measurement point ( ) adapted at a location between the calender ( ) and the preceding section of the line. A control variable ( ) affecting the calendering effect on the calender ( ) is controlled by a feedback control scheme based on the measurement result obtained from said first measurement point ( ) and a control variable ( ) affecting the processability of the web ( ) to be calendered is controlled by a feedback control scheme based on the measurement result obtained from said second measurement point ( ).