the drum have been supported at the back by bands 152 disposed substantially in the peripheral direction of the drum their conventional cross sectional shape being a rectangle a drawback of this structure as well an of other conventional milled screen plates is the asymmetry of the ends of the slots which results in that the whole length of the slot is not efficiently in use fig1 b illustrates an improved wire screen in which the wires 150 have been secured to asymmetric bands having a triangular cross section or more broadly expressed in brackets so that the flow through the plate is disturbed as little as possible the downstream edge of the band mentioned has been bevelled so that it does not prevent the flow from turning smoothly into the slot while providing the bands with an adequate area to ensure their strength the securing of wires of a wire screen may be done also for example by welding a run on the wires in their transverse direction facing the side on which the pulp to be screened is or by affixing the supporting ring on the accept space side in its place in this way the neck solution for a screen plate according to the invention described above may be applied in addition to the smooth screen plates.