| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bag body with a high closing property which can maintain excellent vacuum performance for a long period of closing time. <P>SOLUTION: In a bag obtained by piling a heat weldable outer covering material 4 and applying heat welding at two or more sides, when at least a part of a side 31 obtained by heat welding tperipheries of the outer covering material 4 is cut in a plane vertical to the side 31 and viewing the cross section, either heat welded layer 7 of the outer covering materials 4 positioned to the heat welded side 31 has at least two sunken parts and a seal groove 33 composed of a thin wall part 9 thinner than the thickness of the heat welded layer and a thick wall part 32 positioned at both ends of the thin wall part 9 and thicker than the thickness of the heat welded layer 7 is provided at the deepest heat welded layer 7 of the sunken part and the remained side 34 which is formed as an inserting opening after a core material, that is a filling material, is put into, is provided as the seal groove 33 and then the thin wall part 9, in which the thickness of the heat welded layer 7 of the heat welded side 31 is partly thin, is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT |
