Method for applying zipper to film at tube on a form-fill-and-se

Details Method for applying zipper to film at tube on a form-fill-and-se Method for applying zipper to film at tube on a form-fill-and-se

1995-05-31

1996-09-03

Larson, Lowell A.

Package making

With cover-adjunct application or formation

Adjunct comprising provision to secure cover

53451, 531334, B65B 5104

Patent

active

055512089

ABSTRACT:
A method for manufacturing reclosable packages on a form, fill and seal machine includes the step of providing a continuous sheet of thermoplastic material with a Z-fold extending longitudinally therealong before the sheet is wrapped around a filling tube for forming and filling the packages. The Z-fold is maintained on the tube of thermoplastic material thus formed until it reaches a loop opener on the outside surface of the filling tube. The loop opener transforms the Z-fold into a loop extending longitudinally along and outwardly from the filling tube and from the tube of thermoplastic material wrapped therearound. Simultaneously, a continuous plastic zipper having a pair of mutually interlocking profiles is directed into the tube of thermoplastic material along a channel on the outside surface of the filling tube. The zipper is ultimately guided out from the channel, through the loop opener and into the loop, and is sealed thereto to form the reclosable openings for the plastic packages being manufactured.

REFERENCES:
patent: 4993212 (1991-02-01), Veoukas
patent: 5014498 (1991-05-01), McMahon
patent: 5046300 (1991-09-01), Custer et al.
patent: 5127208 (1992-07-01), Custer et al.
patent: 5425216 (1995-06-01), Ausnit

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