WEB-FORMING SECTION AND METHOD FOR MANUFACTURING MULTI-LAYER WEB

摘要

A web-forming section of a paper or board machine comprises a first web-forming unit in which a first fibre layer (W₁) is formed on a first wire (10), a second web-forming unit in which a second fibre layer (W₂) is formed on a second wire (30), and a couch shoe (39) over a curved deck (40) of which the fibre layers (W₁, W₂) are guided for joining them together. The second fibre layer (W₂) is brought to the couch shoe (39) at an angle (a) of less than 20°, advantageously less than 15° in relation to the approach direction of the first fibre layer (W₁). The couch shoe (39) is provided with underpressure and the radius of curvature of its deck (40) is usually larger than the radius of curvature of a guide roll (38) preceding it. By means of the couch shoe, the fibre layers can be joined together wetter than usual.