| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a packing bag which can easily retain a shape of an opening after opened, and also have superior resealability and manufacturability. <P>SOLUTION: In the packing bag 1, lower edge parts of wall surface films 3a, 3b of front and back are sealed by heat-sealing at a lower seal part 7 and both side edge parts are heat-sealed at a side seal part 8, so that a housing 9 is formed. 2 shape retaining members 12a, 12b are heat-welded onto inner surfaces of the wall surface films 3a, 3b to cross the housing 9 from one of the side seal part 8 to the other of the side seal part 8 along the inner surface of the wall surface films 3a, 3b. A thermoplastic resin layer 25 of the wall surface films 3a, 3b has thickness of not less than 25 μm, and each of the shape retaining members 12a, 12b has a thickness of not less than 0.4 to 0.6 mm. <P>COPYRIGHT: (C)2012,JPO&INPIT |
