Method and apparatus for unfolding folded zipper film

Package making – Methods – Enclosing contents within progressively formed web means

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Details

531333, 533891, 53412, 53551, 226179, 493214, B65B 908, B65B 4116, B31B 190

Patent

active

050275844

ABSTRACT:
A method and a mechanism for making plastic film bags having a reclosable zipper including wrapping a continuous supply of film over a forming tube to form a seam joining the edges of the film and cross-seaming the film, supporting the supply roll of film with the film doubled and a zipper at the doubled edge; guiding the location of the zipper in the film so that the film is properly positioned as it is fed forwardly to be wrapped over the forming tube and means unfolding the film as it is fed forwardly to open the doubled film to be fed to the forming tube as a flat sheet.

REFERENCES:
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patent: 4646511 (1987-03-01), Boeckmann et al.
patent: 4663915 (1987-05-01), Van Erden et al.
patent: 4691499 (1987-09-01), Umeda et al.
patent: 4704842 (1987-11-01), Boeckmann et al.
patent: 4727709 (1988-03-01), Zieke et al.
patent: 4790126 (1988-12-01), Boeckmann
patent: 4829745 (1989-05-01), Behr et al.
patent: 4840012 (1989-06-01), Boeckmann
patent: 4941307 (1990-07-01), Wojcik

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