Manufacture of bonded and inflated sheet laminations

Claim 1

THE METHOD OF PRODUCING A BONDED AND INFLATED LAMINATION HAVING A TUBULAR PASSAGEWAY CAPABLE OF WITHSTANDING SUBSTANTIAL INTERNAL WORKING PRESSURE, COMPRISING THE STEPS OF PROVIDING TWO SHEETS OF MATERIAL AT LEAST ONE OF WHICH IS A WORK HARDENABLE ALUMINUM ALLOY SHEET, BONDING OPPOSING SURFACES OF SAID SHEETS IN A BOND ZONE THEREBETWEEN AND CONTROLLING SAID BONDING TO PRODUCE A LAMINATE HAVING A BOND IN SAID ZONE OF LESS STRENGTH THAN THE STRENGTH OF SAID ALUMNIUM ALLOY SHEET YET OF SUCH STRENGTH THAT SAID SHEETS WILL NOT DELAMINATE DURING NORMAL USE OF THE LAMINATION, SAID ALUMINUM ALLOY SHEET OF THE LAMINATE BEING IN WORK HARDENED CONDITION, PARTIALLY ANNEALING THE WORK HARDENED SHEET TO APPROXIMATELY QUATER HARDNESS, POSITIONING THE LAMINATE BETWEEN DIE COMPONENTS OF A DIE ASSEMBLY WHEREIN AT LEAST ONE OF SAID DIE COMPONENTS HAS A TUBE PATTERN DIE CAVITY DEFINING THE DESIRED PASSAGEWAY CONFIGURATION AND DISPOSING SAID ALUMINUM ALLOY SHEET ADJACENT SAID DIE CAVITY, INTRODUCING AN INFLATING FLUID UNDER PRESSURE BETWEEN SAID SHEETS OF THE LAMINATE TO SEPARATE SAID SHEETS ALONG SAID BOND ZONE AND EXPAND SAID ALUMINUM ALLOY SHEET INTO SAID TUBE PATTERN DIE CAVITY, WHEREBY THE STRENGTH AND ELONGATION CHARACTERISTIC OF SAID ALUMINUM ALLOY SHEET RELATIVE TO THE STRENGTH OF SAID BOND PROVIDING FOR SAID SHEETS IN SEPARATING TO PRODUCE A SHARP ACUTE ANGULAR FORWARDLY MOVING WEDGE FORMATION AHEAD OF SAID INFLATING FLUID SUBSTANTIALLY TO PREVENT THE FORMATION OF RESTRICTIONS IN SAID ALUMINUM ALLOY SHEET DURING INFLATION.

Claim 2

THE METHOD OF PRODUCING A BONDED AND INFLATED LAMINATION HAVING A TUBULAR PASSAGEWAY CAPABLE OF WITHSTANDING SUBSTANTIAL INTERNAL WORKING PRESSURE, COMPRISING THE STEPS OF PROVIDING TWO SHEETS OF MATERIAL AT LEAST ONE OF WHICH IS A WORK HARDENABLE ALUMINUM ALLOY SHEET, BONDING OPPOSING SURFACES OF SAID SHEETS IN A BOND ZONE THEREBETWEEN AND CONTROLLING SAID BONDING TO PRODUCE A LAMINATE HAVING A BOND IN SAID ZONE OF LESS STRENGTH THAN THE STRENGTH OF SAID ALUMNIUM ALLOY SHEET YET OF SUCH STRENGTH THAT SAID SHEETS WILL NOT DELAMINATE DURING NORMAL USE OF THE LAMINATION, SAID ALUMINUM ALLOY SHEET OF THE LAMINATE BEING IN WORK HARDENED CONDITION, PARTIALLY ANNEALING THE WORK HARDENED SHEET TO APPROXIMATELY QUATER HARDNESS, POSITIONING THE LAMINATE BETWEEN DIE COMPONENTS OF A DIE ASSEMBLY WHEREIN AT LEAST ONE OF SAID DIE COMPONENTS HAS A TUBE PATTERN DIE CAVITY DEFINING THE DESIRED PASSAGEWAY CONFIGURATION AND DISPOSING SAID ALUMINUM ALLOY SHEET ADJACENT SAID DIE CAVITY, INTRODUCING AN INFLATING FLUID UNDER PRESSURE BETWEEN SAID SHEETS OF THE LAMINATE TO SEPARATE SAID SHEETS ALONG SAID BOND ZONE AND EXPAND SAID ALUMINUM ALLOY SHEET INTO SAID TUBE PATTERN DIE CAVITY, WHEREBY THE STRENGTH AND ELONGATION CHARACTERISTIC OF SAID ALUMINUM ALLOY SHEET RELATIVE TO THE STRENGTH OF SAID BOND PROVIDING FOR SAID SHEETS IN SEPARATING TO PRODUCE A SHARP ACUTE ANGULAR FORWARDLY MOVING WEDGE FORMATION AHEAD OF SAID INFLATING FLUID SUBSTANTIALLY TO PREVENT THE FORMATION OF RESTRICTIONS IN SAID ALUMINUM ALLOY SHEET DURING INFLATION.