Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Reexamination Certificate
2003-06-16
2008-08-05
Halpern, Mark (Department: 1791)
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
C162S263000, C162S205000, C162S206000, C162S207000, C100S038000, C100S040000, C100S074000, C100S075000
Reexamination Certificate
active
07407562
ABSTRACT:
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 (1) which has at least two roll stacks (21, 22; 31, 32), one stack has at least three rolls and another has at least five rolls. The web is moisturized to a desired pre-moisture content M1by a pre-moisturizer (7) before the calender. At least one intermediate moisturizer (3) is arranged between two roll stacks moisturizes the web to a desired intermediate moisture content M2before the last roll stack (31, 32), in which the web is dried to a desired final moisture value M3. For continuously controlling and optimizing the moisture profile and/or moisture gradient of the web, the pre-moisturizing W1of the web is controlled by a pre-moisturizer (7) control parameter which corresponds to the final moisture value M3of the web.
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Heikkinen Antti
Jaakkola Markko
Kuosa Harri
Kyytsönen Markku
Lätti Hannu
Halpern Mark
Metso Paper Inc.
Stiennon & Stiennon
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