Method for controlling the curl of paper and a paper or board ma

Details Method for controlling the curl of paper and a paper or board ma Method for controlling the curl of paper and a paper or board ma

1998-05-15

2000-03-21

Gravini, Stephen

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34454, 34117, 34118, 34120, F26B 1102, D21F 500

Patent

active

060387890

ABSTRACT:
A method for controlling the curl of paper in which steam treatment and/or moistening of the paper web is/are carried out after the calendering process being performed in the calender. In processes in which calendering is not employed, the curl is controlled in connection with a machine reel-up or in process steps carried out after the machine reel-up. A paper or board machine applying the method includes a headbox, a former, a press, a dryer section and steam boxes, moistening devices, an IR dryer and/or equivalent curl control devices. The steam boxes, moistening devices, IR dryers and/or equivalent curl control devices for the control of the curl are arranged after the calender or, if no calender is employed, in connection with a machine reel-up or a finishing process carried out after the machine reel-up.

REFERENCES:
patent: 3948721 (1976-04-01), Winheim
patent: 4207143 (1980-06-01), Glomb et al.
patent: 4441263 (1984-04-01), Vedenpaa 34115

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