Patent ID: 7435315
Filing Date: 2008-10-14
Classification: D21F

Abstract:
1. A system for stabilizing a paper web in a paper machine, comprising: at least three cylinders arranged to define a pocket space between the at least three cylinders; a blow box disposed in the pocket space, the blow box comprising a blow nozzle, the blow nozzle defining a nozzle slot; a separate wall extending substantially in the direction of the blow box, the separate wall comprising a first edge and a second edge that are substantially parallel to each other, the separate wall being attached from the first edge to the blow box, and the height of the separate wall in a traveling direction of the paper web is 25-300% of the height of the blow box in the traveling direction of the paper web; a boundary layer air doctor removably coupled to the second edge of the separate wall and extending substantially unto the surface of one of the cylinders; and a flexible nozzle wall coupled to the blow box; wherein the first edge of the separate wall is attached to the blow box so that the blow box and the separate wall form a space in the area between an opening nip and a closing nip, and wherein an underpressure is produced in the space between the opening nip and the closing nip to support the paper web towards the fabric in the area between said nips.