Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
2000-02-09
2002-10-29
Gray, Linda (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S292000, C156S299000, C156S300000, C156S301000, C156S302000, C156S519000, C053S451000, C206S810000, C493S195000, C493S200000, C493S267000
Reexamination Certificate
active
06471818
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention concerns the packaging technology of flexible containers, particularly those provided with a zipper-stripe working as the opening and closing device for the packages.
A number of related patents have been issued in this particular field, including European Patent Nos. 0223125, 0276554, 0302144, 0319995,0339324, 0423456, 0528721, International Application No. WO 91/17086, and U.S. Pat. Nos. 4,756,629, 4,876,842, and 5,024,537.
From the evaluation of the patent literature listed above, one will gather the problems of transversal sealing of containers inside which a zipper-stripe is attached. In fact, the zipper-stripe causes problems for proper performance of the sealing operation upon transverse sealing of the package.
European Patent No. 0667228 illustrates a machine that copes with the mentioned problem by cutting a small stripe of the closed zipper before sealing it onto the inside walls of the container in the packaging process. The former procedure, however, does not ensure that the portion of zipper is applied to the inner sides of the container in such a position that it will not interfere with the side sealing zones that work as flanks for the container. This invention also employs a device that adjusts and verifies the position of the zipper portion as related to the subsequent transversal sealings. Furthermore, the zipper portion, after being cut in a continuous stripe, is abandoned and advances only by adhering to the inner sides of the flexible material film.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a new and improved method for ensuring exact positioning of a zipper-stripe in a container during manufacture so as to not have it interfere with the transverse sealing zones that will eventually provide the flanks of the completed containers.
According to the present invention, a method of applying a portion of a closed zipper inside a container of flexible material during manufacture of the container is provided, which comprises the steps of:
applying a length of a closed zipper to the inner side of a film of flexible material with a fixing device in such a position that it will not interfere with transverse sealing zones of a container to be formed from the flexible material; and
cutting the zipper to a portion of length less than the inner width of the container after the the zipper has been applied to the inner side of the film with the fixing device.
This method solves the problem of the prior art procedures in a simple and reliable fashion, since a zipper-stripe or portion is applied to the inner side of the film of flexible material before being cut into portions of smaller length than the inner width of the container, thus avoiding the risk of the zipper extending into the transverse sealing zones and making positioning of the zipper easier, since it is not cut until it has been applied and secured to the container.
REFERENCES:
patent: 4756629 (1988-07-01), Tilman et al.
patent: 4876842 (1989-10-01), Ausnit
patent: 5024537 (1991-06-01), Tilman
patent: 5766399 (1998-06-01), Clark
patent: 0 223 125 (1987-05-01), None
patent: 0 276 554 (1988-08-01), None
patent: 0 302 144 (1989-02-01), None
patent: 0 319 995 (1989-06-01), None
patent: 0 339 324 (1989-11-01), None
patent: 0 371 402 (1990-06-01), None
patent: 0 423 456 (1991-04-01), None
patent: 0 528 721 (1993-02-01), None
patent: 0 667 288 (1995-08-01), None
patent: 01176547 (1989-12-01), None
patent: WO 91/17086 (1991-11-01), None
Brown Martin Haller & McClain LLP
Gray Linda
ICA S.p.A.
LandOfFree
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