Apparatus for preparation of plastic tubes

Claim 1

AN APPARATUS FOR THE BIAXIAL STRETCHING OF AN ORIENTABLE EXTRUDED THERMOPLASTIC RESINOUS TUBE, SAID APPARATUS COMPRISING IN COOPERATIVE COMBINATION, MEANS TO SUPPLY A THERMOPLASTIC RESINOUS TUBE, A HEATING OVEN ADAPTED TO RECEIVE THE THERMOPLASTIC RESINOUS TUBE IN SUBSTANTIALLY CYCLINDRICAL FORM, SAID OVEN HAVING A FIRST END AND A SECOND END, SAID FIRST END HAVING MEANS TO ENGAGE SAID TUBE IN SUBSTANTIALLY SEALING ENGAGEMENT THEREWITH, SAID SECOND END BEING ADAPTED TO ENGAGE SAID TUBE IN SUBSTANTIALLY SEALING ENGAGEMENT, THE OVEN DEFINING A SPACE BETWEEN THE ENDS SUFFICIENTLY LARGE TO PERMIT PASSAGE OF THE TUBE WITHOUT CONTACT BETWEEN THE TUBE AND THE OVEN, THE OVEN BEING SO CONSTRUCTED AND ARRANGED SO AS TO PREVENT SIGNIFICANT MOVEMENT OF GAS INTO OR OUT OF THE OVEN WHEN A TUBE IS IN ENGAGEMENT WITH THE FIRST AND SECOND ENDS AND PASSING THROUGH THE OVEN, RADIANT HEATING MEANS DISPOSED WITHIN SAID HEATING OVEN ADAPTED TO SELECTIVELY HEAT SAID THERMOPLASTIC RESINOUS TUBE, A SECOND OVEN DISPOSED GENERALLY ADJACENT FROM SAID FIRST OVEN AND IMMEDIATELY ADJACENT SAID FILM ENGAGEMENT MEANS AT SAID SECOND END OF SIAD OVEN, SAID SECOND HEATING OVEN HAVING A FIRST END AND A SECOND END, SAID FIRST END BEING GENERALLY ADJACENT SAID FIRST OVEN, SAID SECOND END OF SAID SECOND OVEN CARRYING MEANS TO ENGAGE SAID THERMOPLASTIC RESINOUS TUBULAR FILM IN SEALING ENGAGEMENT THEREWITH AND SAID MEANS BEING SMOOTHELY OUTWARDLY FLARING REMOTE FROM THE SECOND OVEN, THE OVEN DEFINING A SPACE BETWEEN THE ENDS SUFFICIENTLY LARGE TO PERMIT PASSAGE OF THE TUBE WITHOUT CONTACT BETWEEN THE TUBE AND THE OVEN, THE OVEN BEING TO CONSTRUCTED AND ARRANGED SO AS TO PREVENT SIGNIFICANT MOVEMENT OF GAS INTO OR OUT OF THE OVEN WHEN A TUBE IS IN ENGAGEMENT WITH THE FIRST AND SECOND ENDS AND PASSING THROUGH THE OVEN, SAID TUBING ENGAGEMENT MEANS ADJACENT SAID FIRST AND SECOND ENDS OF SAID SECOND OVEN BEING PROVIDED WITH MEANS TO CONTROL THE TEMPERATURE THEREOF, A TUBE COLLAPSING MEANS DISPOSED GENERALLY ADJACENT TO AND GENERALLY AXIALLY DISPOSED WITH RESPECT TO THE SECOND END OF SAID SECOND OVEN, PINCH ROLLS ADJACENT OT SAID TUBE COLLAPSING MEANS REMOTE FROM SAID SECOND OVEN, SAID PINCH ROLLS GENERALLY CENTERED ON AND HAVING A NIP LYING ON THE COMMON AXIS OF SAID FIRST AND SECOND OVENS, SAID ROLLS ADAPTED TO DRAW AND FORWARD SAID COLLAPSED TUBE AT A RATE TO ORIENT SAID TUBE TO A DESIRED DEGREE AND TO MAINTAIN THE INNER SURFACES OF THE COLLAPSED TUBE IN SEALING ENGAGEMENT.

Claim 2

AN APPARATUS FOR THE BIAXIAL STRETCHING OF AN ORIENTABLE EXTRUDED THERMOPLASTIC RESINOUS TUBE, SAID APPARATUS COMPRISING IN COOPERATIVE COMBINATION, MEANS TO SUPPLY A THERMOPLASTIC RESINOUS TUBE, A HEATING OVEN ADAPTED TO RECEIVE THE THERMOPLASTIC RESINOUS TUBE IN SUBSTANTIALLY CYCLINDRICAL FORM, SAID OVEN HAVING A FIRST END AND A SECOND END, SAID FIRST END HAVING MEANS TO ENGAGE SAID TUBE IN SUBSTANTIALLY SEALING ENGAGEMENT THEREWITH, SAID SECOND END BEING ADAPTED TO ENGAGE SAID TUBE IN SUBSTANTIALLY SEALING ENGAGEMENT, THE OVEN DEFINING A SPACE BETWEEN THE ENDS SUFFICIENTLY LARGE TO PERMIT PASSAGE OF THE TUBE WITHOUT CONTACT BETWEEN THE TUBE AND THE OVEN, THE OVEN BEING SO CONSTRUCTED AND ARRANGED SO AS TO PREVENT SIGNIFICANT MOVEMENT OF GAS INTO OR OUT OF THE OVEN WHEN A TUBE IS IN ENGAGEMENT WITH THE FIRST AND SECOND ENDS AND PASSING THROUGH THE OVEN, RADIANT HEATING MEANS DISPOSED WITHIN SAID HEATING OVEN ADAPTED TO SELECTIVELY HEAT SAID THERMOPLASTIC RESINOUS TUBE, A SECOND OVEN DISPOSED GENERALLY ADJACENT FROM SAID FIRST OVEN AND IMMEDIATELY ADJACENT SAID FILM ENGAGEMENT MEANS AT SAID SECOND END OF SIAD OVEN, SAID SECOND HEATING OVEN HAVING A FIRST END AND A SECOND END, SAID FIRST END BEING GENERALLY ADJACENT SAID FIRST OVEN, SAID SECOND END OF SAID SECOND OVEN CARRYING MEANS TO ENGAGE SAID THERMOPLASTIC RESINOUS TUBULAR FILM IN SEALING ENGAGEMENT THEREWITH AND SAID MEANS BEING SMOOTHELY OUTWARDLY FLARING REMOTE FROM THE SECOND OVEN, THE OVEN DEFINING A SPACE BETWEEN THE ENDS SUFFICIENTLY LARGE TO PERMIT PASSAGE OF THE TUBE WITHOUT CONTACT BETWEEN THE TUBE AND THE OVEN, THE OVEN BEING TO CONSTRUCTED AND ARRANGED SO AS TO PREVENT SIGNIFICANT MOVEMENT OF GAS INTO OR OUT OF THE OVEN WHEN A TUBE IS IN ENGAGEMENT WITH THE FIRST AND SECOND ENDS AND PASSING THROUGH THE OVEN, SAID TUBING ENGAGEMENT MEANS ADJACENT SAID FIRST AND SECOND ENDS OF SAID SECOND OVEN BEING PROVIDED WITH MEANS TO CONTROL THE TEMPERATURE THEREOF, A TUBE COLLAPSING MEANS DISPOSED GENERALLY ADJACENT TO AND GENERALLY AXIALLY DISPOSED WITH RESPECT TO THE SECOND END OF SAID SECOND OVEN, PINCH ROLLS ADJACENT OT SAID TUBE COLLAPSING MEANS REMOTE FROM SAID SECOND OVEN, SAID PINCH ROLLS GENERALLY CENTERED ON AND HAVING A NIP LYING ON THE COMMON AXIS OF SAID FIRST AND SECOND OVENS, SAID ROLLS ADAPTED TO DRAW AND FORWARD SAID COLLAPSED TUBE AT A RATE TO ORIENT SAID TUBE TO A DESIRED DEGREE AND TO MAINTAIN THE INNER SURFACES OF THE COLLAPSED TUBE IN SEALING ENGAGEMENT.