Extrusion apparatus with means for incorporating liquid substances into thermoplastic resins

Claim 1

IN COMBINATION IN A SINGLE SCREW EXTRUDER, (1) AN ELONGATED, CYLINDRICAL CHAMBER HAVING ASSOCIATED THEREWITH A DIE AFFIXED TO THE DISCHARGED END THEREOF AND MEANS FOR FEEDING RESIN INTO THE REARWARD ZONE OF THE CHAMBER, (2) AN ELONGATED SCREW MOUNTED WITHIN SAID CHAMBER, (3) MEANS FOR ROTATING SAID SCREW, (4) A FIRST HELICAL LAND MOUNTED ON A FIRST AND REARWARD SECTION OF SAID SCREW AND PITCHED TO COMPRESS AND ADVANCE RESIN THROUGH THE CHAMBER, (5) A PLURALTIY OF SERIES OF AXIALLY ALIGNED SCRAPER PLATES SYMMETRICALLY DISPOSED ABOUT A SECOND AND INTERMEDIATE SECTION OF THE SCREW, EACH OF SAID SERIES CONTAINING A PLURALITY OF SCRAPER PLATES HAVING NARROW PASSAGES WAYS THEREBETWEEN, EACH OF SAID SERIES BEING DISPLACED IN AN AXIAL DIRECTION FROM THE ADJACENT SERIES OF SCRAPER PLATES SO THAT AT LEAST ONE SCRAPER PLATE OF EACH SERIES IS TRANSVERSELY ALIGNED WITH THE PASSAGES WAYS PROVIDED BETWEEN SCRAPER PLATES OF THE ADJACENT SERIES, (6) A SECOND HELICAL LAND MOUNTED ON A THIRD AND FORWARD SECTION OF THE SCREW AND PITCHED TO COMPRESS AND ADVANCE RESIN THROUGH THE CHAMBER, AND (7) MEANS FOR INJECTING LIQUID THROUGH THE CHAMBER WALL SURROUNDING THE SECOND AND INTERMEDIATE ZONE OF THE CHAMBER.