PROCEDIMENTO ED APPARECCHITURA PER IL TRATTAMENTO DI UN IMPASTO LIQUIDDO CONTENENTE MATERIALE SOLIDO UTILIZZABILI PARTICOLARMENTE NELL INDUSTRIA DI PREPARAZIONE DELLA CARTA

摘要

A slurry of cellulosic pulp stock and pulping liquor is distributed from headbox 6 to form a mat on the upper surface of an endless porous belt 2 and after initial drainage of liquid a second moving endless porous belt 3 is brought into contact with the upper surface of the mat. The two belts move in a converging path over individual groups of rollers to extract additional liquid from the mat. The mat contained between the belts is then passed through a series of washing stations where water is applied to the mat by distributors 60 and sucked off as the belts pass round suction rolls 47. Fresh water is delivered to the mat at the downstream station and the water is cascaded by gravity in countercurrent flow through the other washing stations. Following the final washing station, the belts are separated and the mat is removed from between the belts.