Apparatus for melting plastic granules

Claim 1

AN APPARATUS FOR MELTING PLASTIC GRANULES COMPRISING: A HOUSING DEFINING AN ELONGATED BORE AND COMPRISING A FILLING HOOPER, A HEATED CYLINDRICAL ENTRY ZONE, A TAPERED MELTING ZONE, AND A HEATED CYLINDRICAL MEASURING ZONE SERIALLY DISPOSED ADJACENT EACH OTHER, A HEATED TUBE DEFINING AN OUTLET PASSAGE ATTACHED AT AN ANGLE TO THE AXIS OF SAID HOUSING AT ONE END THEREOF, A FIRST SCREW MOUNTED COAXIALLY WITHIN THE BORE OF SAID HOUSING HAVING WORM COURSES FOR CONVEYING PLASTIC FEED MATERIAL FROM SAID HOOPER THROUGH SAID CYLINDRICAL ENTRY ZONE TO SAID TAPERED MELTING ZONE, SAID SCREW TERMINATING AT THE BOUNDRY BETWEEN SAID ENTRY AND MELTING ZONES, A SECOND SCREW COAXIALLY MOUNTED WITHIN SAID HOUSING, A FIRST POSITION OF SAID SECOND SCREW HAVING WORM COURSES IN THE PORTION OF THE BORE OF SAID HOUSING DELINEATED BY SAID MEASURING ZONE, FOR CONVEYING MELTED PLASTIC THROUGH SAID MEASURING ZONE TO SAID OUTLET TUBE, AND A SECOND CYLINDRICAL PORTION OF SAID SECOND SCREW HAVING NO WORM COURSES THEREON DISPOSED IN SAID TAPERED MELTING ZONE, SAID SECOND SCREW HAVING A PORTION EXTENDING BEYOND AN END OF SAID HOUSING, MEANS FOR ROTATING SAID SECOND SCREW IN CONTACT WITH SAID PORTION OF SAID SECOND SCREW EXTENDING BEYOND SAID HOUSING, MEANS FOR SENSING THE PRESSURE OF PLASTIC MATERIAL IN SAID OUTLET PASSAGE, MEANS LINKING SAID MEANS FOR ROTATING SAID SECOND SCREW WITH SAID SENSING MEANS FOR CONTROLLING THE RATE OF ROTATION OF SAID SECOND SCREW, MEANS FOR CONTINUOUSLY CONTROLLING SAID FIRST SCREW''S RATE OF CONVEYING OF SAID PLASTIC FED IN SAID HOOPER THROUGH SAID ENTRY ZONE TO SAID MELTING ZONE RESPONSIVE TO PRESSURE IN SAID MELTING ZONE, WHEREBY A CONTINUOUS STREAM OF LIQUID LASTIC UNDER SUBSTANTIALLY CONSTANT PREDETERMINED PRESSURE IS EXTRUDED AT SAID OUTLET PASSAGE.

Claim 2

AN APPARATUS FOR MELTING PLASTIC GRANULES COMPRISING: A HOUSING DEFINING AN ELONGATED BORE AND COMPRISING A FILLING HOOPER, A HEATED CYLINDRICAL ENTRY ZONE, A TAPERED MELTING ZONE, AND A HEATED CYLINDRICAL MEASURING ZONE SERIALLY DISPOSED ADJACENT EACH OTHER, A HEATED TUBE DEFINING AN OUTLET PASSAGE ATTACHED AT AN ANGLE TO THE AXIS OF SAID HOUSING AT ONE END THEREOF, A FIRST SCREW MOUNTED COAXIALLY WITHIN THE BORE OF SAID HOUSING HAVING WORM COURSES FOR CONVEYING PLASTIC FEED MATERIAL FROM SAID HOOPER THROUGH SAID CYLINDRICAL ENTRY ZONE TO SAID TAPERED MELTING ZONE, SAID SCREW TERMINATING AT THE BOUNDRY BETWEEN SAID ENTRY AND MELTING ZONES, A SECOND SCREW COAXIALLY MOUNTED WITHIN SAID HOUSING, A FIRST POSITION OF SAID SECOND SCREW HAVING WORM COURSES IN THE PORTION OF THE BORE OF SAID HOUSING DELINEATED BY SAID MEASURING ZONE, FOR CONVEYING MELTED PLASTIC THROUGH SAID MEASURING ZONE TO SAID OUTLET TUBE, AND A SECOND CYLINDRICAL PORTION OF SAID SECOND SCREW HAVING NO WORM COURSES THEREON DISPOSED IN SAID TAPERED MELTING ZONE, SAID SECOND SCREW HAVING A PORTION EXTENDING BEYOND AN END OF SAID HOUSING, MEANS FOR ROTATING SAID SECOND SCREW IN CONTACT WITH SAID PORTION OF SAID SECOND SCREW EXTENDING BEYOND SAID HOUSING, MEANS FOR SENSING THE PRESSURE OF PLASTIC MATERIAL IN SAID OUTLET PASSAGE, MEANS LINKING SAID MEANS FOR ROTATING SAID SECOND SCREW WITH SAID SENSING MEANS FOR CONTROLLING THE RATE OF ROTATION OF SAID SECOND SCREW, MEANS FOR CONTINUOUSLY CONTROLLING SAID FIRST SCREW''S RATE OF CONVEYING OF SAID PLASTIC FED IN SAID HOOPER THROUGH SAID ENTRY ZONE TO SAID MELTING ZONE RESPONSIVE TO PRESSURE IN SAID MELTING ZONE, WHEREBY A CONTINUOUS STREAM OF LIQUID LASTIC UNDER SUBSTANTIALLY CONSTANT PREDETERMINED PRESSURE IS EXTRUDED AT SAID OUTLET PASSAGE.