| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging bag capable of being formed without cutting off part of a heat-sealed part, including opening means causing no pain when touching by the finger, and easily and surely openable.SOLUTION: The packaging bag as packaging bags 1 and 1A where an inner space 3 is formed by a sheet material 2, and the inner space 3 is sealed by a heat-seal part 6 of the sheet material 2 is such that: part of the heat-seal part 6 is formed with a weakened part 7 extending from an outer edge 6a of the heat-seal part 6 to the vicinity of the inner space 3; an opening start part 8 comprising a notch or a thin part is formed on an outer edge part 7a of the weakened part 7; and a recessed part 10 and a projecting part 11 which are formed by pressing pyramidal molding blades into the sheet material 2 from opposite directions in such a manner as to engage the blades with each other are arranged alternately in zigzag in a direction in which the sheet material is torn in the weakened part 7. |
