包装袋の製造方法

Japanese Patent JP7147164

B2

To propose a self-standing packaging bag which has a mechanism for automatically releasing steam when heated in a microwave oven in an unopened state and which has no problem in filling contents.SOLUTION: In a self-standing packaging bag, sealant layers of a front surface laminate 2 and a rear surface laminate 3 having a base material layer 11 and a sealant layer 13 are made to face each other, and below that, a bottom member 4 also having a base material layer and a sealant layer is inserted by being folded in an inverted V-shape so that the sealant surface comes to the outside, and the periphery is heat-sealed. At the uppermost part of the packaging bag, a filling seal part 8 is provided. At the upper part of the front surface laminate or the rear surface laminate, a steam discharge port 5 is provided which automatically opens by a pressure of steam generated when heated in a microwave oven. When the height of the packaging bag is defined as H, a distance from a lower end of the filling seal part to the steam discharge port is defined as a, and unsealed width of the bottom member is defined as G, the position of the steam discharge port is provided in a range of G/2