Patent ID: 7964829

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, pressing the subassembly with the first and second die members, applying an electric field between the first and second die members by supplying a single radiofrequency current to 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, increasing the spacing between portions of the opposing first and second die members in the first location to reduce the heating of the pair of sheets at the first location while portions of the first and second die members at the second location are at a spacing that causes continued welding at the second location, and decreasing without completely eliminating the electric field after said step of increasing the spacing.