| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging bag for microwave cooking which rises when heated by a microwave oven and opens a steam vent hole, where the steam vent hole opens smoothly and the packaging bag has a self-standing property to be able to remain standing when the heating is finished.SOLUTION: Provided is a packaging bag with a steam vent having a standing-pouch shape including front and rear surface main body films 2, 3, and a bottom tape 4. The rear surface main body film 3 includes a folded part 5 which is folded in a Z-shape over an entire horizontal width in parallel to a top seal part 6 and is projected outward and upward. A dig and seal part 10 in which a side seal part 9 enters is formed on both sides of the top seal part. A steam vent mechanism part 13 is formed on the top seal part, comprising an unsealed part 14 entering downward from an upper outer side, and a steam vent seal part 15 in a narrow width projected inward so as to surround the unsealed part. |
