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. 27, 1998
Filed:
Nov. 05, 1993
Pekka Neittaanmaki, Jyvaskyla, FI;
Erkki Laitinen, Jyvaskyla, FI;
Tapani Miinalainen, Vesanka, FI;
Pekka Pakarinen, Jyvaskyla, FI;
Jouni Koskimies, Jyvaskyla, FI;
Valmet Paper Machinery Inc., Helsinki, FI;
Abstract
A method for regulation of the transverse distribution of the fiber orientation of a web produced by means of a paper machine or equivalent, by regulating the transverse profile of the discharge opening (16) of the headbox (10) of the paper machine. The transverse grammage profile of the paper web (W.sub.0 . . . W.sub.1) produced by means of the paper machine is measured, and the measurement signal obtained in this way is used as a feedback signal in the control system. With the machine configuration and parameters present in the paper machine to be controlled, data are collected concerning the relationship between the directional angle of the transverse distribution of fiber orientation and the transverse distribution of grammage of the web (W.sub.0 . . . W.sub.1) that is being produced by, carrying out response runs of the paper machine in its various states of operation (i). The relation data are stored in the memory of the computer (52). By making use of the relation data, the distribution of fiber orientation in the web (W.sub.0 . . . W.sub.1) to be produced is corrected by regulating the transverse profile of the discharge opening (16) of the headbox (10). Moreover, a corresponding method for on-line measurement of the fiber orientation is described.