Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Patent
1998-03-27
1999-11-16
Bennett, Henry
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
34115, 34117, 34118, D21F 500, F26B 1102
Patent
active
059835230
ABSTRACT:
A method in a dryer section of a paper or board machine for controlling curl of paper, in which steam treatment and/or moistening of the paper web is/are employed. The operations carried out in order to control the curl of the paper web are carried out in a number of stages when the web temperature is, during at least one stage, lower than 85.degree. C., preferably lower than 75.degree. C., and when the dry solids content of the web is in the range of K1-K2, wherein K1 is the ultimate dry solids content of the web -7% and K2 is the ultimate dry solids content +3%. The paper or board machine includes at least a headbox, a former, a press, and a dryer section in steam boxes or moistening devices are employed for control of the curl. There are at least two curl regulation devices to enable regulation of the curl in a number of stages, and/or the curl regulation devices are arranged to operate in an area in which the web temperature is, during at least one stage lower than 85.degree. C., preferably lower than 75.degree. C., and the dry solids content of the web is in a range of K1-K2, wherein K1 and K2 are as defined above.
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Ahonen Pasi
Ijas Vesa
Juppi Karj
Kallioniemi Jaakko
Bennett Henry
Gravini Steve
Valmet Corporation
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