Extrusion machines

Claim 1

AN EXTENDED FLAT FILM DIE COMPRISING AN ELONGATED DIE BODY, MEANS IN SAID DIE BODY DEFINING A LONGITUDINAL CAVITY AND AN EXTRUSION ORIFICE EXTENDING FROM SAID CAVITY SUBSTANTIALLY ALONG THE LENGTH OF SAID BODY FOR FORMING A FILM OF PLASTIC MATERIAL, HEATING MEANS FOR HOLDING THE PLASTIC CONTENTS OF SAID CAVITY AND SAID ORIFICE AT A DESIRED EXTRUDING TEMPERATURE INCLUDING A GENERALLY U-SHAPED FLUX GUIDE HAVING A LONGITUDINALLY EXTENDING BODY PORTION TERMINATING IN INWARDLY TURNED LEGS, MEANS FASTENING SAID LEGS AT THE ENDS THEREOF IN INTIMATE CONTACT WITH SAID DIE BODY, AN ELECTRIC AND HEAT INSULATING COIL FORM CARRIED DIRECTLY ON SAID BODY PORTION OF SAID FLUX GUIDE AND HAVING MEANS FOR SUPPORTING A PAIR OF HEATING COILS IN LONGITUDINALLY SPACED RELATION THEREON, AND A PAIR OF INDUCTION HEATING COILS HAVING A PLURALITY OF TURNS WOUND AS A TORUS DIRECTLY ONTO SAID FORM IN LONGITUDINALLY SPACED RELATION AND IN SPACED RELATION TO THE ADJACENT SURFACE OF SAID DIE BODY FOR EFFECTING THE INJECTION OF FLUX INTO SAID DIE BODY SUBSTANTIALLY WHOLLY THROUGH SAID FLUX GUIDE FOR HEATING SAID DIE BODY.