Waste paper and stock preparation

Fibre separation in the pressure screen

Pressure screens serve to filter out contaminants and foreign matter as well as separate the fibres. The aqueous fibre suspension is pumped through the screen at pressures and temperatures of approx. +2 bar and +50 °C respectively. A rotating sieve basket inside causes the desired sorting effect. The systems have a feed inlet for the suspension, an outlet for the good material (accept) and an overflow outlet for the sorted-out material (reject). The process conditions are characterized by pressure surges and abrasion as well as contaminants in the suspension.

Pressure measurement with VEGABAR 52 or VEGABAR 54

High screening efficiency requires a defined pressure difference between inlet and outlet. The measurement is realized with the pressure transmitters VEGABAR 52 or 54. Thanks to the ceramic CERTEC® measuring cell, the instruments are highly abrasion resistant and can be installed flush with the vessel wall. Further typical applications for these pressure transmitters in stock preparation are level and pressure measurement in the cleaners, in the flotation system and on the disc filter.