| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging bag wherein puckering may not occur on the side and peeling of the side seal is not likely to occur due to tensile stress. SOLUTION: In the packaging bag comprising a single rectangular sheet whose portions are sealed to assemble into a hexahedral shape comprising a top face, a front face, a rear face, a first side face, a second side face and a bottom face, a pair of seals 8, 8 are provided on each of the first and second side faces inside a right-angled isosceles triangle which is assumed with a side connecting between corners P1, P2 of the top face as a base and a vertical angle of the right angle, wherein an end on a side of a side seal 7 of each of the seals 8, 8 is separate from the side seal 7, and a part at 5 to 50 mm from the end on the side of the side seal 7 on each of the seals 8, 8 is made to be a curve which gradually comes closer to the right angle with respect to the side seal 7. |
