Partially secured four flange zipper strip for transverse...

Details Partially secured four flange zipper strip for transverse... Partially secured four flange zipper strip for transverse...

A - Human Necessities

44

B

A44B 19/00 (2006.01) B31B 1/90 (2006.01) B65B 61/18 (2006.01) B65D 33/24 (2006.01) B65D 33/25 (2006.01)

Patent

CA 2345824

The zipper includes zipper tape with a narrow band of untreated surface on the leading edges of the flanges that permits the tack sealing of the flanges together by non- continuous sealing bars. This prevents the leading edge of the flanges from curling or flipping up thereby reducing the tendency of a leading edge of a zipper from jamming as the web moves over the collar of a form fill and seal apparatus.

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