Flexible bags – With closure – Rib and groove
Reexamination Certificate
2000-05-04
2002-02-26
Pascua, Jes F. (Department: 3721)
Flexible bags
With closure
Rib and groove
C383S061100, C024S585100
Reexamination Certificate
active
06350058
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to the application of zipper strips in the transverse direction. More particularly, the present invention pertains to the use of 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.
2. Description of the Prior Art
In the prior art, the application of a zipper to a film is taught in such references as U.S. Pat. No. 4,909,017 entitled “Reclosable Bag Material, Method and Apparatus”, issued on Mar. 20, 1990 to McMahon et al. However, in a “pinch and pull” configuration, such as is disclosed in U.S. patent application Ser. No. 09/244,519 entitled “Pinch and Pull Open Reclosable Bag and Zipper Therefor”, filed on Feb. 4, 1999 for Johnson, there has been a tendency for the leading edge of a zipper to jam as the web moves over the collar. Similar prior art can be found in U.S. patent application Ser. No. 09/393,206 entitled “Transverse Direct Zipper Tape”, filed on Sep. 9, 1999 for Malin et al.
OBJECTS AND SUMMARY OF THE INVENTION
It is therefore an object of the present invention to reduce the tendency for a leading edge of a zipper to jam as the web moves over the collar in a form fill and seal (FFS) device.
This and other objects are achieved by removing the heat resistant coating from the leading edge of the base web and likewise from portions of the four legs of a flange zipper strip in a pinch, grip and pull configuration of a form fill and seal (FFS) device. Further, a serrated seal bar is used in the web direction to seal down the leading edge to keep the fourth or top edge of the flange from curling or flipping up, without sealing into the bag. The serrated seal is both a carrier seal and a tack seal that breaks open when the package is opened for use.
REFERENCES:
patent: 4909017 (1990-03-01), McMahon et al.
patent: 5100246 (1992-03-01), La Pierre et al.
patent: 5152613 (1992-10-01), Herrington, Jr.
patent: 5489252 (1996-02-01), May
patent: 5551127 (1996-09-01), May
patent: 6065872 (2000-05-01), Johnson
Illinois Tool Works Inc.
Pascua Jes F.
Pitnay, Hardin, Kipp & Szuch LLP
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