| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a packaging bag in which warping of the body 10 inside reinforcing members 25 is suppressed and resistance to impact force is improved. <P>SOLUTION: Parts of the side edges and upper edges of the body 10 formed into a bag shape by heat welding a bottom face sheet and side face sheets are covered with the reinforcing members 25 consisting of a thermoplastic resin. A window part 26 is provided in the reinforcing member 25 formed at the upper edge of the body 10. In injection molding the reinforcing members 25 on the body 10, the body 10 is placed in the cavities of molds so that the upper edges of the body 10 projects therefrom. Part of the projecting upper edges are made to abut on restricting parts formed on the cavities of the molds. This makes the upper edges of the body 10 placed in the reinforming members 25 less likely to warp, and suppresses deterioration in the impact resistance or the like of the packaging bag even if the covering width of the reinforcing material 25 is increased. <P>COPYRIGHT: (C)2008,JPO&INPIT |
