Abstract: The disclosure concerns apparatus for disintegrating waste paper and for sorting out fibers to be recovered from the suspension. There is a disintegrating chamber connected by a gravity feed discharge line to a drum type or vibration sorting device. A circulating member disposed in the disintegrating chamber rotates about an axis that is tilted at a small acute angle from the vertical. A screen located beneath the circulating member separates the disintegrating chamber from a discharge chamber beneath the screen. The screen sorts out coarser particles letting only finer suspension paticles pass into the discharge chamber. A first suspension discharge line communicates with the discharge chamber while a second suspension discharge line communicates with the disintegrating chamber immediately above the screen. Both discharge lines empty into each other and lead to the sorting device. Appropriate slides control flow through the two discharge lines.

Abstract: A cellular drum filter for dewatering suspensions is disclosed, comprising trough means and a filter drum mounted to rotate partially submerged in a liquid suspension in the trough means. Vacuum suction is applied to the surface of the drum from the interior thereof via radial passages communicating preferably with respective axial channels leading to a control head. Each radial passage and each channel has a cross-section whose shape is an arcuate sector of an annulus.