METHOD FOR PRODUCING INK TANK, INK TANK, AND INK JET CARTRIDGE

摘要

PROBLEM TO BE SOLVED: To provide a method for mass producing ink tanks exhibiting excellent sealing performance, pressure resistance and durability stably, an ink tank and an ink jet cartridge. SOLUTION: When a flexible tank sheet 106 is thermally welded to a frame 115 by means of a heat head 122, a spring 107 is compressed while regulating the planar part 106A on the outside of a tank sheet 106 by means of a retaining jig 121.