Horizontal pressure type pulp screen

Claim 1

A PULP SCREENING MACHINE HAVING AN INLET END AND A DISCHARGE END AND AN ANNULAR PERFORATED SCREEN EXTENDING FROM THE INLET END TO DISCHARGE END, A ROTARY IMPELLER, A PULP STOCK SUPPLY INLET LOCATED AT THE INLET END AXIALLY WITH RESPECT TO SAID IMPELLER, A RELATIVELY LARGE AREA WITHIN THE SCREEN ADJACENT THE SAID INLET, A CORE MEMBER ON SAID IMPELLER, THE SAID CORE MEMBER EFFECTING A PROGRESSIVE REDUCTION IN THE AREA WITHIN THE SCREEN FROM THE SAID RELATIVELY LARGE AREA TO A RELATIVELY SMALL AREA SPACED INWARDLY FROM THE DISCHARGE END OF THE MACHINE, THE PROGRESSIVE REDUCTION IN AREA BETWEEN SCREEN AND CORE EFFECTING A RELATIVELY HIGH VELOCITY TO THE FLOW OF PULP STOCK THROUGH THE MACHINE, A BAFFLE SET TRANSVERSELY OF THE AXIS OF THE IMPELLER AND LOCATED AT THE END OF SAID CORE REMOTE FROM THE INLET END OF THE MACHINE AND SPACED INWARDLY FROM THE DISCHARGE END OF THE MACHINE TO FORM A REJECT MATERIAL WASHING COMPARTMENT, THE PERIPHERAL EDGE OF THE SAID BAFFLE BEING SPACED RADIALLY OUTWARDLY FROM THE ADJACENT SURFACE OF THE SAID CORE TO FORM A RESTRICTED ANNULAR PASSAGE CONNECTING SAID WASHING COMPARTMENT WITH THE AREA BETWEEN THE SAID CORE AND SCREEN, A SERIES OF WING MEMBERS SECURED TO THE SAID BAFFLE ADJACENT THE PERIPHERAL EDGE THEREOF AND PROJECTING AXIALLY ACROSS THE SAID WASHING COMPARTMENT, AND WASH LIQUID INLET AND OUTLET REJECT DISCHARGE MEANS OPENING INTO THE WASHING COMPARTMENT.