VERFAHREN ZUR REGELUNG UND ON-LINE-MESSUNG DER FASERORIENTIERUNG EINER BAHN, GEMACHT AUF EINER PAPIERMASCHINE

• Main Authors: LAITINEN, ERKKI, PAKARINEN, PEKKA, NEITTAANMAEKI, PEKKA, MIINALAINEN, TAPANI, KOSKIMIES, JOUNI
• Format: Patent
• Language: German
• Published: 15.05.1996
• Edition: 6
• Subjects: ACCESSORIES FOR PAPER-MAKING MACHINES; CALENDERS; METHODS OF PRODUCING PAPER THEREON; PAPER-MAKING; PAPER-MAKING MACHINES; PRODUCTION OF CELLULOSE; TEXTILES

A method for regulation of the transverse distribution of the fibre 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 (W0...W1) 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 fibre orientation and the transverse distribution of grammage of the web (W0...W1) that is being produced by, by means of the paper machine, carrying out response runs 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 fibre orientation in the web (W0...W1) 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 fibre orientation is described.