Paper drying apparatus

Claim 1

IN PAPER DRYING APPARTUS HAVING A MULTIPLICITY OF CYLINDER UNITS CONSISTING OF ONE UPPER CYLINDER, TWO LOWER CYLINDERS IN A TRIANGULAR SPACED RELATION WITH THE UPPER CYLINDER AND WITH MEANS FOR PASSING PAPER OVER THE CYLINDERS AND DRYING FELT OVER THE PAPER ON THE CYLINDERS, TWO OPEN GRILLAGE FELT DRYING ROLLERS ONE ON EACH SIDE OF THE UPPER CYLINDER AND AN OPEN GRILLAGE FELT DRYING ROLLER BETWEEN THE TWO LOWER CYLINDERS, THE IMPROVEMENT WHICH COMPRISES A HOOD EXTENDING LENGTHWISE OF EACH OPEN GRILLAGE ROLLER PROVIDED WITH MEANS TO FORCE HOT AIR THROUGH THE OPEN GRILLAGE ROLLER AND THE OVERLYING FELT, AN EXHAUST CONDUIT SUPPORTED IN THE SPACE BETWEEN THE TWO LOWER CYLINDERS AND THE UPPER CYLINDER AND EXTENDING LENGTHWISE THEREOF, SAID CONDUIT HAVING AN OPENING EXTENDING LENGTHWIDE FOR TRANSVERSE ENTRY OF MOISTURE LADEN AIR FROM THE DRYING FELT AND MOISTURE LADEN AIR FROM BETWEEN THE ADJACENT RUNS OF PAPER WEB PASSING ADJACENT THE EXHAUST CONDUIT, SAID OPENINGS BEING OF A SIZE TO PREVENT SHREDS OF PAPER BEING SUCKED INTO THE CONDUIT, A REMOVABLE DOCTOR BLADE BEARING ON THE UPPER CYLINDER FOR SCRAPING OFF LINT AND FIBERS WHICH ARE REMOVED BY THE EXHAUST CONDUIT, AND MEANS TO OPERATE THE EXHAUST CONDUIT UNDER REDUCED PRESSURE.