| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a packaging bag allowing a user not to worry about an opening position, by an effective step without using costs.SOLUTION: With respect to a method for manufacturing a packaging bag formed with an opening perforation, the top surface of the packaging bag is sandwiched between a front surface 10 and a rear surface 20 in a state of being positioned on the height direction upper part of the front surface 10 and the rear surface 20, and folded in the inner direction along a crest fold line 31 extending in the width direction. Furthermore, the method includes a step of forming the opening perforation, in a state where the top surface 30 is folded in the inner direction, and the front surface 10, a front side part 32 positioned on the side of the front surface 10 than the crest fold line 31 in the top surface 30, a rear side part 33 positioned on the side of the rear surface 20 than the crest fold line 31 in the top surface 30, and the rear surface 20 are superposed in four layers, in an area including a superposed area as the four layer area, or the superposed area. |
