| 摘要 |
PROBLEM TO BE SOLVED: To rapidly enhance pealing strength at a predetermine position in the opening direction, and enable opening to be done easily at the position, however, enable a stop of the opening operation positively at this position, and conduct the operations simply and inexpensively. SOLUTION: A peelable layer 5 is formed on one surface of the base material resin layer 4 of at least one packaging material 2, and then the layer 5 is heat bonded to the other packaging material 3 in order to form a weak sealing part 9 around matter 7 to be packaged. In addition, a resin staying reservoir 12 gathered by heating and flowing a part of the constitutional resin of the packaging material 2 is formed at least on a part following the intermediate part in the opening direction of the weak sealing part 9, and further the adhesive strength of the resin staying reservoir 12 is made higher than that of the weak sealing part 9.
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