Metso Paper Inc.

Markko Jaakkola

Pekka Linnonmaa

Markku Kyytsönen

Antti Heikkinen

Harri Kuosa

Hannu Lätti

Hannu Royal Cliff Gardens Condominium Lätti

The moisture profile and/or moisture gradient of a paper web of at least SC quality paper is controlled in a paper machine comprising a calender () which has at least two roll stacks (), one stack has at least three rolls and another has at least five rolls. The web is moisturized to a desired pre-moisture content Mby a pre-moisturizer () before the calender. At least one intermediate moisturizer () is arranged between two roll stacks moisturizes the web to a desired intermediate moisture content Mbefore the last roll stack (), in which the web is dried to a desired final moisture value M. For continuously controlling and optimizing the moisture profile and/or moisture gradient of the web, the pre-moisturizing Wof the web is controlled by a pre-moisturizer () control parameter which corresponds to the final moisture value Mof the web.

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Järvenpää, Finland

Markko Jaakkola