| 摘要 |
PURPOSE:To effect thermal bonding with ease under reduced pressure by providing a thermal bonding prevention piece at a part of an opening, applying thermal bonding operation to the opening and utilizing an unbonded part as a suction and exhaust passage for the air in a bag. CONSTITUTION:After putting clothes, bedclothes, etc., in a packing bag 1, a thermal bonding prevention piece 16 made of paper is attached to one side of an opening 4 of the bag 1 and then an opening sealing piece 9 is folded in two and applied to the opening 4 with a thermal bonding resin layer 11 of the piece 9 facing inward to cover the opening 4. If under such condition, thermal bonding is effected all over the piece 9 by applying an iron thereto, the part in which the piece 16 is interposed remains unbonded, following which the piece 16 is removed from the outside of the opening 4. As a result, a passage is formed across the interior and exterior of the bag 1, whereby a suction pipe of a vacuum cleaner is inserted into said passage to suck the air in the bag to establish reduced pressure in the bag. If thermal bonding is effected again on the cut-off mouth by means of an iron while the reduced pressure is being held, all area of the opening and the opening sealing piece are thermally bonded. |
