Metso Paper Inc.

Markus Laitila

Pekka Koivukunnas

Mika Viljanmaa

Pekka Linnonmaa

Markku Kyytsönen

Aaron Mannio

Kari Hasanen

Tapio Mäenpää

Timo Vuorimies

Helena Leppäkoski

Markku Kojo

Toni Seppänen

Tarja Hanska

Heikki Kaarakka

Marjaana Toppila

Seppo Palonen

Ville Tiistola

Petteri Kokkonen

Esa Keskinen

Olli-Pekka Väkevä

A calender and an arrangement for mounting calender rolls, the calender comprising at least two calender nips () formed by at least two stacked rolls (). The rolls are have bearing housings () by means of which the rolls () are stacked into roll pairs forming the calender nips (), and means () connecting the bearing housings (and) of the rolls pairs with each other. At least two successive calender nips () are arranged so that in the successive nips the mutual distance between the longitudinal axes of the lower rolls () is smaller than the corresponding mutual distance between the respective upper rolls () of the nips, whereby the disposition of the rolls () forms a V-shaped angle as seen from the end of the calender machinery and thus forms an operating area between the nips for changing the rolls. The rolls are combined into nips advantageously using heatable pull rods inserted through the bearing housings.

Calender and an arrangement for fastening rolls of a calender

The invention relates to a belt calender, comprising a first roll (), a second roll (), and a belt loop therebetween, comprising an incompressible metal belt () pressed by the second roll () against the first roll () to establish a calendering zone between the first roll () and said belt (). The second roll () is provided with a compressible belt section () to be pressed against the metal belt ().

Belt calender

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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Järvenpää, Finland

Markus Laitila