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A METHOD FOR CONTROLLING SHRINKAGE AND/OR STRETCHING OF A PAPER WEB IN THE DRYING SECTION OF A PAPER MACHINE, IN THE FORM OF A CYLINDER DRIER AND/OR FAN DRYER, TRANSVERSELY TO THE FEED DIRECTION OF THE WEB; AND ARRANGEMENTS FOR CARRYING OUT THE METHOD
A METHOD FOR CONTROLLING SHRINKAGE AND/OR STRETCHING OF A PAPER WEB IN THE DRYING SECTION OF A PAPER MACHINE, IN THE FORM OF A CYLINDER DRIER AND/OR FAN DRYER, TRANSVERSELY TO THE FEED DIRECTION OF THE WEB; AND ARRANGEMENTS FOR CARRYING OUT THE METHOD
It is a known phenomenon that the web during the drying moment in a paper machine shrinks. The shrinkage in the machine direction can be controlled by arranging the different driving groups in the drying section to operate at different speeds. The shrinkage in cross direction, however, heretofore was not brought under control. The present invention has the object to solve thos problem. …??According to the invention, the problem of shrinkage is solved in that the web during a certain drying interval is subjected to outward directed forces, which are applied during a suitable drying interval and preferably at a low dry content, for example directly after the press section.
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