PURPOSE: To provide a packing bag with a deaeration valve, which can smoothly and reliably operate the deaeration valve in a method for using the deaeration valve. ;CONSTITUTION: A strip and flat deaeration valve 3 is arranged by perforating a side edge sealing belt 2 of a bag 1 like a rice bag. The side edge seal belt 2 wherein the deaeration valve is provided is bent into an arch shape to the center of the bag 1, while the deaeration valve 3 is fixed on the bent part 2a by heat sealing. In the heat-sealing of the deaeration valve 3, the surface on the film side of the deaeration valve 3 is taken as an arced heat-sealing line having the same shape as the bent part 2a, and the surface on the nonwoven fabric 3b side of the deareration 3 is taken as a heat sealing line y protruded outward by narrowing the inner width of the bent part 2a.;COPYRIGHT: (C)1994,JPO&Japio
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