| 摘要 |
PROBLEM TO BE SOLVED: To enhance the certainty to release steam, in a packaging bag configured to release the steam through a steam-passing hole in heating.SOLUTION: The packaging bag formed by superposing an upper film and a lower film includes: a folded portion formed by folding a part of the upper film with an easy-peel tape having easy peeling properties being interposed followed by sealing; and a body portion formed by superposing the remaining part of the upper film on the lower film and sealing the periphery of the superposed area. The folded portion includes: a double-sealed portion in which both surfaces of the easy-peel tape are sealed to the upper film respectively; a single-sealed portion in which one surface of the easy-peel tap is sealed to the upper film; and the steam passing hole formed on the side closer to the tip side of the folded portion beyond the double-sealed portion. At least in the vicinity of the steam passing hole in the double-sealed portion, the seal strength of the one surface of the easy-peel tape with the upper film is higher than that of the other surface of the easy-peel tape with the upper film. |
