Patent ID: 8362396

Claim:
A method of forming a bag assembly comprising a bag and a tube providing fluid communication with an interior of the bag, the method comprising: forming a subassembly by positioning at least a portion of the tube between a pair of opposed sheets; placing the subassembly between a first die member and a second die member opposing said first die member, the first and second die members each defining a single die; pressing the subassembly with the first and second die members; applying an electric field between the first and second die members in a first location for heating the pair of sheets along a path to weld the pair of sheets together to define a perimeter of the bag and in a second location for welding the tube to the pair of sheets; and moving a portion of one of the opposing first and second die members in the first location away from the other of the first and second die members in the first location to reduce the heating of the pair of sheets at the first location while maintaining a spacing between portions of the opposing first and second die members in the second location to continue welding at the second location.