| 摘要 |
PURPOSE:To obtain a bent part having high internal tearing resistance by forming excessive deflection at a part close to the end part of the bent part in the width direction. CONSTITUTION:A hinge part 22a is constituted by a film-like bent part 22a1, solid parts 22a2, 22a3, and a bent part 22a4 expanded from the bent part 22a1 and deflected like a bridge. The expanded length l+alpha of the bent part 22a4 is set longer than the length of the bent part 22a1. Even if a tensile force C is affected on the bent part 22a1, the tensile force C is not affected on the bent part 22a4 because the bent part 22a4 is deflected. Consequently, an internal tearing force is not applied to junction parts a, b of the bent part 22a4. |
