Patent ID: 7340870

Claim:
A method for manufacturing double ply packaging bags comprising: feeding a first packaging web, the first packaging web including a window patch that is cut out or pre-cut; feeding a second packaging web, the second packaging web including another window patch that is cut out or pre-cut; applying a fastener assembly to the first packaging web and the second packaging web in front of the window patches of the first packaging web and the second packaging web, the fastener assembly comprising side films for attaching the fastener assembly to the first packaging web or the second packaging web; attaching the fastener assembly onto the first packaging web the side films for attaching the fastener assembly being incorporated between the two packaging webs or the second packaging web; attaching the two packaging webs to each other to form a double ply web, the fastener assembly being located inside the double ply web, and forming a double ply packaging bag with the double ply web, the double ply packaging bag having a front wall and a back wall, the front wall and the back wall each being formed by the double ply web.