Screening apparatus

摘要

A screening apparatus, in particular a bar screen for sorting and classifying fluid flows, especially fiber suspensions includes parallel bar-shaped screen elements mounted on cross bars and defining slotted screening perforations therebetween. At its top surface facing the fluid flow, each screen element is provided with a projection in form of a rib or bead or the like of different cross section to provide an irregular screening surface. The screening slot between neighboring screen elements is defined by at least one wall section which extends parallel to the midplane of the screening slot in order to reduce an expansion of the slot due to wear.