Metso Paper Inc.

Hannu Lepom&auml;ki

Juhana Lumiala

Petri Nyberg

Hannu Karema

Petri Jetsu

Juha Salmela

Jari P H&auml;m&auml;l&auml;inen

Pasi Sirvi&ouml;

Markku Kellom&auml;ki

A paper/board machine headbox ( ) has a stock inlet header (J), a tube bank ( ), a turbulence generator ( ) and a slice opening ( ) which is provided with a profile bar. The headbox ( ) is provided with cross direction measuring sensors (D , D ; D ), by means of which the flow rate profile of the headbox ( ) is determined, and the profile bar of the slice opening ( ) of the headbox ( ) is adjusted in the cross direction on the basis of the thus determined flow rate profile. The headbox ( ) is provided with measuring sensors (D , D ; D ) for determining the cross direction flow rate profile of the headbox ( ) and with means for adjusting the profile bar on the basis of the flow rate profile.

Method and system for controlling headbox in a paper/board machine

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.

Regulation system for the short circulation and headbox of a paper machine or equivalent

Growing community of inventors

Laukka, Finland

Hannu Lepomäki

Growing community of inventors

Laukka, Finland

Hannu Lepom&auml;ki

Hannu Lepomäki