Patent ID: 6131743
Filing Date: 2000-10-17
Classification: B01D,B07B,D21D,Y10T

Abstract:
Screen for fiber suspensions having a shape which is essentially rotationally symmetrical in relation to a screen axis, a first circumferential side of said screen forming an inlet side and the other, second circumferential side thereof forming an outlet side of said screen for the fiber suspension, with a series of profiled bars extending transversely to the circumferential direction of the screen, said profiled bars being arranged at equal spacings from one another in the circumferential direction of the screen and forming slot-shaped screen openings between them, the cross sections of said profiled bars each having an elongate shape with a first end region facing away from the screen outlet side and a second end region facing away from the screen inlet side, and with at least two supporting rings made of plastically deformable material, said supporting rings lying in planes extending perpendicularly to said screen axis and being arranged in spaced relation to one another in the direction of said screen axis, each of said supporting rings having in its first edge region facing said screen inlet side a series of cutouts open at their edge towards said screen inlet side, the shape of said cutouts--viewed in the direction of said screen axis--corresponding to the configuration of the second cross-sectional end regions of said profiled bars lying in said cutouts, and forming at a radial spacing from the first edge of said supporting ring facing said screen inlet side an undercut in which a projection of said profiled bar cross section engages so that said profiled bars are held positively in a radial direction in relation to said screen axis and in the circumferential direction of said screen with their second cross-sectional end regions in said supporting ring cutouts, said profiled bars projecting in a radial direction over the first edges of said supporting rings, and being clamped with their second cross-sectional end regions in said supporting ring cutouts as a result of a plastic deformation of said supporting rings, wherein said supporting rings have on the side of said profiled bars facing said screen outlet side such deformed regions that as a result of a displacement of supporting ring material in the direction towards said screen inlet side said profiled bar projections are pressed in this direction against said undercuts.