| 摘要 |
The invention relates to packages (20) having improved openable and resealable interlocking closures (22), and methods and apparatus for making the same from a continuous web of film. The closure (22) has a male portion (22B) and female portion (22A) formed transversely to the direction of film flow during package formation at line speed. A converter device (29) adjunct to standard packaging apparatus (33) forms a small amount of the running packaging film (25) into a multilayer strip (30) as an integral part of the film. The packaging film (25) is fed into the converter (29) where the film is fanfolded to form a stack, the layers of which are heat sealed together forming a multilayered strip (30) in a plane parallel to that of the film. The strip is abraded on one surface to selectively remove the thermoplastic coating, the film then passing into the packaging apparatus (33) where product wrapping takes place in packages having single or double overlap longitudinal package seals (48,49). The package ends are sealed and the package resealable locking closure is formed in the strip (30). <IMAGE> |
