Elastic melt extruder and method of operation

Claim 1

AN ELASTIC MELT EXTRUDER COMPRISING A CASING ENCLOSING AN INTERIOR CHAMBER AND INCLUDING A PLATE HAVING A PAIR OF ORIFICES LOCATED IN AN INTERIOR SHEARING SURFACE, A PAIR OF SHEAR DISCS DISPOSED IN SAID CHAMBER AND HAVING END FACES CLOSELY SPACED FROM SAID SHEARING SURFACE TO DEFINE THEREBETWEEN SEPARATE SHEARING ZONES COMMUNICATING THROUGH THE ORIFICES WITH A COMMON OUTLET, MEANS FOR ROTATING SAID DISCS AND MEANS FOR SUPPLYING PARTICULATE PLASTIC MATERIAL FOR PASSAGE THROUGH SAID SHEARING ZONES AND ISSUANCE THROUGH SAID ORIFICES, SAID DISCS EACH HAVING A BORE ALIGNED WITH THE CORRESPONDING ORIFICE, AND A RECIPROCABLE PISTON MOVABLE IN EACH OF SAID BORES AND THROUGH THE CORRESPONDING SHEARING ZONE INTO THE ADJACENT ORIFICE TO SUBJECT PLASTICIZED MATERIAL THEREIN TO THE PRESSURE OF THE CORRESPONDING PISTON AND INDEPENDENT OF ANY PRESSURE IN THE CORRESPONDING SHEARING ZONE, AND A SINGLE CHECK VALVE INTERPOSED BETWEEN THE ORIFICES AND THE COMMON OUTLET TO PREVENT SIMULTANEOUS COMMUNICATION BETWEEN THE OUTLET AND BOTH SAID ORIFICES.