Patent ID: 6425486
Filing Date: 2002-07-30
Classification: D21D,Y10T

Abstract:
A cylindrical screen for separating undesired particles from a fibre suspension, said screen having an inner side and an outer side and provided witha plurality of circumferentially extending projections (19) on the outer side of the screen, grooves (17) formed on the inner side of the screen and extending in a direction having an axial component, and screening passages in the form of slots (18) disposed in the area of each groove (17) and diverging from the inner side of the screen towards the outer side thereof, the projections (19), grooves (17) and slots (18) being produced by removing material from a substantially planar screen plate that is bent into cylindrical shape subsequent to the material removal, characterised in that each of the projections (19) has an outer face (25) and at least some of the projections (19b) are formed with a cross-sectional configuration such that their cross-sectional surface is wider adjacent its outer face (25) than adjacent the region of the slots (18).