Method for the liquid treatment of, primarily, cellulosic pulp

Claim 1

IN A METHOD FOR WITHDWAWING OF LIQUID FROM A FIBROUS METERIAL SUSPENDED IN A LIQUID AND FED THROUGH A GENERALLY UPRIGHT CONTAINER, IN THE AXIAL DIRECTION OF SAID CONTAINER, SAID CONTAINER BEING IN THE PART WHERE, THE WITHDRAWAL IS CARRIED OUT, FILLED WITH THE SUSPENSION, INVOLVING THE STEPS OF FLOWING THE LIQUID TOWARDS AT LEAST ONE CHAMBER FOR COLLECTING WITHDRAWN LIQUID, SAID CHAMBER BEING POSITIONED WITHIN THE SUSPENSION AND SAID CHAMBER HAVING A PERVIOUS WALL, SUBJECTING SAID PERVIOUS WALL TO THE ACTION OF PRESSURE VARIATIONS WHICH AT LEAST PARTIALLY INTERRUPT THE INFLUX OF WITHDRAWN LIQID INTO SAID COLLECTING CHAMBER, THERBY PERVENTING THE CLOGGING OF THE PERVIOUS WALL OF THE COLLECTING CHAMBER AND FACILITATING THE TRAVEL OF MATERIAL PAST OF ALONG SAID SURFACE, THE IMPROVEMENT WHICH CONSISTS IN PRODUCING SAID PRESSURE VARIATIONS THROUGH THE INTERMEDIARY OF A GAS, SAID GAS BEING TRANSMITTED THROUGH A CONDUIT INTO THE TOP OF THE COLLECTING CHAMBER AND BEING SUBJECTED TO PRESSURE IMPULSES, FREE PASSAGE OF SAID GAS BEING MAINTAINED IN SAID CONDUIT AND IN THE TOP OF SAID CHAMBER THEREBY OBTAINING RAPID TRANSMISSION OF THE PRESSURE IMPULSES TO THE SURFACE OF LIQUID COLLECTED IN SAID COLLECTING CHAMBER.