Method for controlling shrinkage and/or stretching of a paper web in the drying section of 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

摘要

The present invention relates to an arrangement and a method for controlling or regulating shrinkage and/or stretching of a paper web transversely to the transport direction thereof in a drying section of a paper machine, this drying section having the form of a cylinder dryer (6) and/or a fan dryer. At a point in the drying process at which the paper web exhibits a dry solids content of at most 75%, the paper (10) is subjected to an outwardly directed force which is forced to act in the edge portion (10a, 10b) of the web. The forces are caused to act adjacent parallel edge portions (10a, 10b) of the paper web and are directed away from each other. The magnitude of these forces is selected so that they fall beneath shrinkage forces occurring momentary on the paper web at the dry solids content in question by at most 50%.