Axial extrusion mill

Claim 1

AN AXIAL TYPE EXTRUSION MILL FOR PELLETING FIBROUS VEGETABLE AND COARSE GROUND MATERIALS COMPRISING A HOUSING HAVING A LONGITUDINALLY GROOVED CYLINDRICAL BORE WITH A BULK MATERIAL INLET ADJACENT ONE EDN THEREOF, THE OTHER END BEING THE DISCHARGE END, SAID HOUSING INCLUDING A JACKET MEANS FOR CONTAINING A HEATING FLUID IN SURROUNDING RELATION AROUND AT LEAST A PORTION OF SAID HOUSING, A GENERALLY HOLLOW IMPELLER BODY DISPOSED IN THE BORE OF SAID HOUSING AND SUPPORTED FOR ROTATION THEREIN, SAID IMPELLER BODY HAVING AN EXPANDING DIAMETER IN A DIRECTION TOWARD THE DISCHARGE END FOR AT LEAST A PORTION OF THE LENGTH THEREOF, AT LEAST ONE HELICAL BLADE SURROUNDING SAID IMPELLER BODY FOR AT LEAST A PORTION OF ITS LENGHT AND COOPERATING WITH THE GROOVED BORE WHEN SAID HOUSING TO MOVEBULK MATERIAL ALONG SAID BORE WHEN SAID IMPELLER ROTATES, NOZZLE MEANS DISPOSED AT THE DISCHARGE END OF SAID MILL AND ARRANGED SUBSTANTIALLY TANGENTIAL TO SAID IMPELLER BODY SAID NOZZLE MEANS COMMUNICATING WITH THE PASSAGE DEFINED BETWEEN THE HOUSING AND THE IMPELLER BODY TO DISCHARGE COMPRESSED MATERIAL FROM SAID MILL, AND HEATING FLUID INJECTION AND REMOVAL MEANS FOR INDUCING A HEATING FLUID INTO THE HOLLOW INTERIOR OF SAID IMPELLER BODY.