Apparatus for making extruded sheet material

Claim 1

AN EXTRUSION ASSEMBLY FOR FABRICATING SYNTHETIC THERMOPLASTIC SHEET MATERIAL HAVING A DIFFERENTIALLY COLORED BAND THEREIN COMPRISING AN EXTRUDER DIE MEMBER HAVING A CHAMBER THEREIN AND AN EXTRUSION ORIFICE IN ONE SURFACE THEREOF COMMUNICATING WITH SAID CHAMBER; A FIRST CONDUIT FOR SUPPLYIMG A MAINSTREAM OF FLUID SYNTHETIC THERMOPLASTIC MATERIAL TO SAID CHAMBER AT A POINT SPACED FROM SAID EXTRUSION ORIFICE; A SECOND CONDUIT FOR SUPPLYING A STREAM OF DIFFERENTLY COLORED FLUID SYNTHETIC THERMOPLASTIC MATERIAL TO SAID CHAMBER, SAID SECOND CONDUIT HAVE A PORTION EXTENDING WITHIN SAID CHAMBER GENERALLY PARALLEL TO SAID EXTRUSION ORIFICE AND OF SMALLER EXTERNAL DIMENSION THAN SAID CHAMBER TO ALLOW FLOW ABOUT AT LEAST ONE SURFACE OF A MAIN STREAM OF FLUID SYNTHETIC THERMOPLASTIC MATERIAL ISSUING FROM SAID FIRST CONDUIT, SAID SECOND CONDUIT PORTION HAVING A DISCHARGE PORTION WITHIN SAID CHAMBER RECIPROCABLE SUBSTANTIALLY RECTILINEARALY AND SUBSTANTIALLY PARALLEL TO SAID DIE ORIFICE BETWEEN SAID POINT OF SUPPLY FROM SAID FIRST CONDUIT AND SAID DIE ORIFICE, SAID RECIPROCABLE DISCHARGE PORTION HAVING A DISCHARGE APERATURE THEREING OPENING ADJACENT SAID DIE MEMBER ORIFICE; AND MEANS FOR RECIPROCATING SAID DISCHARGE PORTION AND ITS DISCHARGE APERTURE SUBSTANTIALLY PARALLEL TO SAID DIE ORIFICE AND TRANSVERSELY OF A PLASTIC MAINSTREAM ISSUING FROM THE FIRST CONDUIT TO DISCHARGE THEREINTO A DIFFERENTIALLY COLORED BAND MOVING LONGITUDINALLY OF SAID SECOND CONDUIT AND TO PRODUCE A SHEET OF THERMOPLASTIC MATERIAL EXTRUDING FROM SAID DIE ORIFICE COMPRISED OF THE THERMOPLASTIC MATERIAL OF THE MAINSTREAM WITH A GENERALLY LONGITUDINALLY EXTENDING COLOR BAND EMBEDDED THEREIN AND HAVING A TRANSVERSE DIRECTIONAL COMPONENT.