SEALING MEMBER FOR OPENING ON FLEXIBLE CONTAINER WALL

摘要

PROBLEM TO BE SOLVED: To exactly close the opening of a curving container by a pull tab by putting the pull tab on opening and bonding the pull tab to the surface of a container wall while following up to the curving container wall. SOLUTION: The pull tab 8 is put on the aperture 6 of the container wall 9. The pull tab 8 is heat sealed to the container wall 9 by a bonding device 70. The abutment surface 83 of a sealing punch 81 of the bonding device 70 curves to a spherical shape. The sealing punch 81 is downwardly pressed by plural bolt 86 attached with springs 87 and is inclined in correspondence to the pull tab 8 abutting thereon. The heating insert 84 of the sealing punch 81 heats up the abutment surface 82 to heat seal the pull tab 8 and the container wall 9. Even if the container wall 9 curves, the abutment surface 83 follows up to curve and surely cap the pull tab 8.