| 摘要 |
PURPOSE:To obtain sufficient heat sealing strength even though a thickness of a hot-melt resin layer of a packing film is limited to a necessary minimum one. CONSTITUTION:A method for manufacture of a packing bag is obtained wherein a packing film 2 composed of laminating a hot-melt resin layer 4 on a base film layer 3 is heat sealed longitudinally transveresly in a state where the hot- melt resin layer 4 is opposed thereto with a heat sealing blade of a heat sealing roll. A total thickness of the hot-melt resin layer 4 in a heat sealing part 6 adjacent to a packing space 5 is made thicker then the total thickness of the hot-melt resin layer of the packing film by moving a part of the hot-melt resin layer 4 positioning apart from the packing space 5, of a part to be heat sealed to a part side positioning adjacent to the packing space 5, of the part to be heat sealed with the heat sealing blade. |
