The utility model discloses a
microwave heating packaging bag, including bag body and its setting exhaust area. The exhaust area is from inside to outside in proper order for inner layer,
adhesive layer, release layer and outer layer. Inner layer is equipped with fourth knife line, and
adhesive layer is equipped with the third knife line coincident with it, and release layer is equipped with the second knife line coincident with it, and outer layer is equipped with first knife line. The knife line encloses the area and is all located in release layer area. When
microwave heating, the
steam pressure in the bag breaks through the knife line of inner layer,
adhesive layer and release layer in proper order, enters the clearance between release layer and outer layer, and finally breaks through the first knife line of outer layer and discharges, prevents the bag body explosion. Release layer reduces the adhesion between outer layer and adhesive layer, and is favorable to steam
diffusion. When daily storage, the outer layer and release layer other parts are closely bonded, ensure good sealing property, prolong food
shelf life.