| 摘要 |
PURPOSE:To give a fine external appearance to a joining portion and eliminate the recovery and disposal of staples at disjoining by a method wherein a heating tool is inserted into the overlapped portion of the corrugated boards in order to form a fusion welding layer of resin between the corrugated boards adjacent to each other. CONSTITUTION:After heating a heating pin 5 by energizing the heating tool 4, the heating pin 5 is driven downward so as to press the tip of the heating pin 5 against the overlapped portion 7 of the corrugated boards. The corrugated board 1 is heated by the heating pins 5 so as to be locally softened and melted and consequently the heating pin 5 penetrates the corrugated board 1 and passes through overlapped faces 8 and locally softens and melts the corrugated board 2 in order to advance into the corrugated board 2. With the advancement of the heating pin 5 into the corrugated boards, the softend and fused films 9 of the respective corrugated boards are partially formed around the heating pin 5. Consequently, a part of said softened and fused films 9 spread themselves into the overlapped faces 9 in order to form the fused layer 10 of resin. The heating pin 5 is drawn upward before its tip attains the underside surface of the corrugated board 2 and, after that, the corrugated board is left as it cools so as to allow the fused layer 10 and the softened and fused film 9 to solidify themselves in a few minutes in order to finish the joining of the corrugated boards 1 and 2. |
