Method and apparatus for unfolding folded zipper film

Details Method and apparatus for unfolding folded zipper film Method and apparatus for unfolding folded zipper film

1990-01-12

1991-07-02

Sipos, John

Package making

Methods

Enclosing contents within progressively formed web means

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:
patent: 3815317 (1974-06-01), Toss
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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