Method for controlling curl of paper in a dryer section of a pap

Details Method for controlling curl of paper in a dryer section of a pap Method for controlling curl of paper in a dryer section of a pap

1999-04-06

2000-05-16

Gravini, Stephen

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34448, 427209, 427210, D21F 500, F26B 1102

Patent

active

060619279

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%.

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