Form-fill-seal machine

producing machine fill-seal (1) comprising means for moving a web (6) of the packaging material through the machine according to the course of the process and means for transforming (8, 9, 20, 21a, b) of the web into filled bags, furthermore comprising a device (11) applying a strip fastener having means for feeding the strip zipper (25) for each horizontal pocket to the path of the process, said means for delivering comprises the first (43) and second (44) conveyor, which in the feed direction of the strip with zipper are arranged one behind the other and are both provided with means for retaining or hook strip zipper during supply, a blade (51) between the first and the second conveyor being positioned to cut the strip zipper, characterized in that the primeracinta conveyor (43) and the second conveyor belt (44) are adapted to hold the zipper strip over its length during delivery through the vacuum means.