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    • 5. 发明专利
    • PACKAGING BAG
    • JPH09286471A
    • 1997-11-04
    • JP6835596
    • 1996-03-25
    • TOYO ALUMINIUM KK
    • YASUKAWA HIDENORITAMAI TOSHINAGASUGIYAMA ATSUNORISHIMIZU TAICHI
    • B65D81/34B65D33/16B65D33/38B65D75/60
    • PROBLEM TO BE SOLVED: To make an easily-separable tape separate on increase of internal pressure at the time of cooking by heating, and to make removal of internal pressure easy by a method wherein the easily-separable tape interposed in a part to be opened naturally is made to project toward the contents housing part of a bag, and the width of this projection is made smaller than the width of a separated part extending from the internal end of the tape in its breadthwise direction. SOLUTION: At a part A of a packaging bag 1 made up of laminated sheets each composed of a base 51 and a heat-sealing layer 52, a heat-sealing part 2a is formed of a heat-sticking layer of a easily-separable tape 4 and the heat-sealing layer of the bag main body 1. The easily-separable tape 4 is made up by laminating layers 41 and 42 each to be stuck by heating to each of the laminated sheets of the bag main body 1 to an easily-separable sticking layer 43, and a separatred part 43a wherein the layers 42 and 43 are not joined together is formed entirely in the breadthwise direction of the tape 4. The tape 4 is arranged so that it can project by a specified width toward the inside of the bag when interposed in the opening of the bag main body 1, and the width of the separated part 43a is made bigger than the width of projection of the tape 4.