| 摘要 |
A zipper e.g a string zipper 12 with no mounting flanges, is welded to bag material 15 for forming zipper bags. The zipper material is fed from a driven unwind (11) and the bag material receives the zipper material. Guides (44, 49) place the zipper material wherever desired with respect to the bag material. The bag material, with the zipper material M, is held between continuously moving belts 62, 64. Stationary heaters 80, 81 the same width as the zipper material are placed against the belts, and provide heat through the belts sufficient to weld the bag material to the zipper material. The zipper material is then heated as a preseal (90) before the material is contacted by the side welding blade (20) which completes the seal and separates discrete bags. <IMAGE> |
