Patent ID: 6789681
Filing Date: 2004-09-14
Classification: B07B,D21D,Y10T

Abstract:
Screen for fiber suspensions having a shape which is essentially rotationally symmetrical in relation to a screen axis, with a first and a second circumferential side, one of which forms an inlet side and the other an outlet side of the screen for the fiber suspension, with a series of straight profiled bars arranged at spacings from one another in the circumferential direction of the screen, extending transversely to the circumferential direction of the screen and forming slot-shaped screen openings of identical width between them, the cross sections of the profiled bars each having an elongate shape with a first end region facing away from the second circumferential side of the screen and a second end region facing away from the first circumferential side of the screen, and with several ring-shaped profiled bar supports arranged at spacings from one another in the direction of the screen axis and lying in planes extending perpendicularly to the screen axis, each of the profiled bar supports having in its first edge region facing away from the second circumferential side of the screen a series of cutouts opening towards the first circumferential side of the screen, the shape of the cutoutsâ€”viewed in the direction of the screen axisâ€”corresponding to the configuration of the second cross-sectional end regions of the profiled bars lying in these cutouts, and forming at a radial spacing from the first edge of the profiled bar support facing the first circumferential side of the screen an undercut in which a projection of the profiled bar cross section engages so that the profiled bars are held positively in a radial direction in relation to the screen axis and in the circumferential direction of the screen with their second cross-sectional end regions in the profiled bar support cutouts, with the profiled bars preferably projecting with their first cross-sectional end regions in a radial direction over the first edges of the profiled bar supports, wherein the second cross-sectional end region of each profiled bar has for each profiled bar support a recess which decreases the width of the second cross-sectional end region measured in the circumferential direction of the screen, and the recesses of each profiled bar are arranged at spacings from one another corresponding to the spacings of the profiled bar supports and are located outside the profiled bar supports in the finished screen, and wherein the profiled bar recesses are of such configuration that the areas of the second cross-sectional end regions of the profiled bars provided with these recesses are insertable transversely to the longitudinal direction of the pertinent profiled bar into the profiled bar support cutouts at least without any substantial plastic deformation of the profiled bar supports and/or the profiled bars.