| 摘要 |
PURPOSE: To obtain easier opening of a sealed container and package by providing a stress concentrating pattern on one side of a flat sheet and forming the pattern having stresses concentrating protrusion members such as conducts and channels at a right angle to a folding line. CONSTITUTION: A stress concentrating member 25, placed at the for pouring out aperture forming position of containers or distribution packages, has sheet 12 made of substantially flat and relatively stiff materials, preferably plastic materials. A stress concentrating protrusion pattern 26 has one or more stress concentrating protrusion members 26A-26E formed to conduct or gutter or channel-shaped and is formed at right angle to a folding line 24 with notches. Preferably protrusion members 26A, 26E are formed to be longer than other members 26B-26D and are positioned at both sides of short and breakable protrusion members as guards, i.e., reinforced members. |
