Patent ID: 6916404
Filing Date: 2005-07-12
Classification: D21G

Abstract:
1. A method for web threading in a drying section of a machine, the method comprising a first phase and a second phase; the first phase comprising: forming and at least one second strip by cutting a full-width web coming to a cylinder drying group of the drying section, and guiding the leader forward in the drying section from a first drying cylinder of the cylinder drying group where the web can be run down, and the second phase comprising spreading the leader to the width of the full-width web, wherein an underpressure box is arranged at an opening gap between said first drying cylinder and a drying wire, such that the underpressure box is on a side of the drying wire away from the web, whereby the underpressure box is capable of directing an underpressure p 1 against the web and the underpressure p 1 is controllable in a cross direction of the machine, said underpressure box creates an underpressure region between the leader and the underpressure box, the underpressure region having underpressure p a protection zone is provided between the underpressure region and a region adjacent to the underpressure region, the protection zone having a barrier between the underpressure region and the region adjacent to the underpressure region, the region adjacent to the underpressure region has a pressure p