To provide a packaging bag with a fastener, which is used as such a bag that is equipped with a re-opening preventing means recognizing the bag opened without permission.
A storing opening part 3 with a fastener 5 communicating with this bag body 1 is integrally provided on the upper end of the bag body 1 through a fold 2, and a sealing piece 4 with a length to the upper end edge longer than that of the storing opening part 3 is projected upward from the fold 2 on the back face side of this storing opening 3. On the surface of the bag body 1 there are provided, a releasing agent layer 8a and a coloring agent layer 8b printing on the surface of the bag body 1 by printing characters or the like so as to include this releasing agent layer 8a. A pressure-sensitive adhesive layer 6A covered by a release paper 7A is provided on the surface of the sealing piece 4 to constitute a re-opening preventive means. After an article or the like is stored in the bag body 1, the sealing piece 4 as well as the storing opening 3 are folded back on the surface of the bag body 1 to sealed, and then, it is constituted that a printing pattern appears by releasing the releasing agent layer 8a when the sealing is opened.
SENDO NAOHISA
NAKAMURA HIROBUMI
