| 摘要 |
The invention relates to a rotationally symmetrical screen for fiber suspensions, comprising an inlet (20) and an outlet (22) for the fiber suspensions, a series of profiled bars (16) which extend perpendicular to the peripheral direction of the screen and which form slotted screen openings (80) and whose cross-section has a longitudinal shape with a first end area facing away from the screen outlet and a second end area facing away from the screen inlet, in addition to metal support rings (10, 12, 14) which are set apart from each other and which are arranged on planes running vertical to the screen axis (18). Each support ring has a series of indents (34) which are open on the edges extending from the inlet, whose shape, when seen in the direction of the screen axis, matches that of the second cross-sectional areas (16B) of the profiled bars located in said sections and form an undercut (34B) in a radial distance from the edge of the support ring facing from the screen inlet. A protuberance (16C) of the cross-section of the profiled bar engages with said undercut so that the second cross-sectional edge areas of the profiled bars are held in a radial direction in relation to the screen axis and locked in positive fit in the support ring sections (34) in the direction of the periphery of the screen. In order to secure the profiled bars to the support rings in a simple and permanently precise manner, the support rings are provided with deformed areas (70A, 70B; 72A, 72B) on the side of the profiled bars facing the outlet so that the protuberances of the profiled bars are pressed against the undercuts of the support ring sections in the direction of the screen inlet as a result of the displacement of the support ring material in said direction.
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