Paper making machine and a method of cutting a fibrous web in a paper making machine

Abstract

The invention relates to a paper making machine () comprising a forming section () in which a fibrous web (W) can be formed, a drying section () in which a formed fibrous web (W) can be dried; and a reel-up () on which a dried fibrous web (W) can be wound into a roll (). The paper making machine () is arranged to carry a fibrous web (W) in the machine direction (MD) along a predetermined path (P) and the paper making machine () has at least one water jet cutting device () arranged to cut the fibrous web (W) that is moving in the machine direction (MD) such that the fibrous web (W) is divided into at least one waste part () and a remaining part (). The paper making machine () is arranged to direct the at least one waste part () away from the predetermined path (P) and to convey the remaining part () further in the machine direction (MD) along the predetermined path (P). The paper making machine () further comprises a blowing device () arranged to blow gas or air against the water jet cutting device () in a direction toward the remaining part of the fibrous web () such that fiber particles that have been released by the cutting action of the water jet cutting device () are blown onto the surface () of the remaining part () of the fibrous web (W) and follow the remaining part () of the fibrous web along the predetermined path (P). The invention also relates to a method in which gas or air is blown in a direction toward the remaining part of the web such that fiber particles that have been released by the cutting action of the water jet cutting device () are blown onto the surface () of the remaining part () of the fibrous web (W). The stream of air or gas is given a shape which is circular cylindrical or conical and expanding in the direction in which the stream moves.