| 摘要 |
PROBLEM TO BE SOLVED: To provide a microwave oven adaptable packaging bag including a pressure relieving mechanism for preventing explosion caused by thermal expansion.SOLUTION: A packaging bag is obtained by heat sealing three sides after overlapping a front face film 1 and a rear face film 8, bag-making in a state of using the remaining side as an opening part for filling content, and providing on the opening part, a heat seal object place for sealing the content after filling. Ventilation means 2 to be a pressure releasing port is provided on the front face film of the heat seal object place. A belt-like film 6 covering the ventilation means is heat sealed with the reverse surface of the front face film where the ventilation means is positioned, and the rear face film side of the belt-like film is set to a heat seal object surface planned to be heat sealed with the rear face film reverse surface during sealing of the packaging bag. A heat seal strength between the front face film and the belt-like film is set to be weaker than a heat seal strength for bag-baking the packaging bag, and a heat seal strength between the belt-like film and the rear face film during sealing of the packaging bag. |
