Patent attributes
A packaging bag is formed by bending a laminate film at two portions in parallel to each other such that both end portions thereof are mated to each other and the mated end portions are bonded together so as to provide a tubular body having upper and lower openings, which are sealed by forming upper and lower seal portions, respectively. In such packaging bag, the two bent portions 15 and 16 of the laminate film constitute side edge portions as boundary portions between a front surface portion 2 and a back surface portion 3 of a packaging bag, the upper seal portion 5 is formed with a rough surface seal open portion 10 formed with aggregation of a plurality of fine recesses formed to an outer layer constituting the laminate film and a plurality of fine through holes penetrating the outer layer so that the rough surface seal open portion is formed to the front surface and/or back surface portion of the packaging bag so as to include one of the side edge portions thereof, and the rough surface seal open portion 10 is formed in the upper seal portion 5 such that a lower end of the rough surface seal open portion is apart upward from a lower end of the upper seal portion 5.
