Metso Paper Inc.

Markku Kojo

Pekka Koivukunnas

Pekka Linnonmaa

Markku Kyytsönen

Heikki Kettunen

Aaron Mannio

Reijo Pietikäinen

Tapio Mäenpää

Kari Hasanen

Timo Vuorimies

Markus Laitila

Helena Leppäkoski

Henri Vaittinen

Olli-Pekka Väkevä

Tarja Hanska

Toni Seppänen

Marjaana Toppila

A method and assembly is disclosed for moistening a web of paper or paperboard, the assembly comprising a steam blow cavity open toward a moving web (). The steam blow cavity houses spray nozzles () at least for injecting steam into the cavity so as to form a steam atmosphere therein. Additionally, the steam blow cavity houses spray nozzles () for spraying a mist of a heated liquid onto the web () within the thus formed steam atmosphere.

Method and assembly for moistening a moving web or paperboard

The surface of a web is monitored by a fault detection system (), a machine condition monitoring system, a quality measurement system, a web moisture measurement and/or a web temperature measurement and the soiled part of the surface of the roll is detected and localized by means of a soiling monitoring apparatus (). A control system () controls a cleaning device () to remove the detected soiling. As a web (W) travels in a paper or board production or finishing process or in finishing machinery the web and/or the surface of the roll is monitored and after a detected deviation the surface thereof is momentarily spread with a liquid while machinery is running at the same time as the web (W) travels over said roll surface.

Method and equipment for cleaning and maintaining rolls

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Espoo, Finland

Markku Kojo