| 摘要 |
PROBLEM TO BE SOLVED: To obtain a packaging bag containing an article inside with highly rigid pillars provided at four corners without enlarging a pillow-packaging machine. SOLUTION: Joint pillars 3a and 3a formed by joining an internal surface u of an inwardly folded part of a pair of folds 3 and 3 exhibiting a Z-shaped section formed to be symmetrical with respect to the center line X of a sheet 2 with a flat internal surface w are provided successively, and outer joint pillars 4a and 4a formed by joining the internal surface u of the inwardly folded part of a pair of outer folds 4 and 4 exhibiting a Z-shaped section formed to be symmetrical outside with the flat internal surface w, are also provided successively. The outward fold 4 may be formed only outside any one of the pillars 3a to form three pillars 3a, and 3a (4A). COPYRIGHT: (C)2007,JPO&INPIT
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