| 摘要 |
PROBLEM TO BE SOLVED: To form a projection part on one end surface of a plastic bag, even if a bottom gusset material is not separately supplied, by newly providing a bag-making machine of a special constitution.SOLUTION: A first trunk material 1 is bent along a first bending line 5 in the vicinity of one side edge 21 of the first trunk material 1, and a second trunk material 2 is bent along a second bending line 6 in the vicinity of corresponding one side edge 22 of the second trunk material 2, and a first bending part 23 is formed in the first trunk material 1. When bending, a distance between the one side edge 21 and the first bending line 5 is larger by a preset distance L3 than two times of a distance between the corresponding one side edge 22 and the second bending line 6. Thus, one end surface is formed of the first bending line 23, and a projection part is formed of the preset distance L3.SELECTED DRAWING: Figure 1 |
