| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging bag whose opening is surely hermetically sealed with ease and production is easy. SOLUTION: Flexible two sheets (one is referred to 11a, the other 11b) are superimposed to form a bag main body 1 having a closable opening at one end. Two cores (first core 2A and second core 2B), each of which is formed of a bandlike plate strip, are provided on the internal surface of the one sheet 11a defining the opening, such that the cores are parallel with each other with the first core 2A situated along an edge of the opening 11. A first groove 3A of a predetermined length is defined between the first core 2A and the second core 2B. The sheets 11a and 11b are bent in such a manner that the cores are superimposed along the first groove 3A serving as a fold line. Thus, the opening 11 is hermetically sealed.
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