PACKAGING BAG AS WELL AS METHOD FOR PRODUCTION

Abstract

A packaging bag has a bag body formed from a flat web and has a first front wall and a second front wall as well as a stand-up bottom formed in a bottom section by folding and gluing the front walls. The flat web has a varnish coating on an outside of the bag body, wherein the first front wall has an adhesive region free of the varnish coating in the bottom section of the bag body.

Claims

1. A packaging bag having a bag body formed from a flat web, the bag comprising: a first front wall; a second front wall; and a stand-up bottom formed in a bottom section by folding and gluing the first and second front walls; wherein the flat web has a varnish coating on an outside of the bag body; and wherein the first front wall has an adhesive region free of the varnish coating in the bottom section of the bag body.

2. The packaging bag according to claim 1, wherein to form the stand-up bottom, the front walls are folded over so that sections of the adhesive region of the first front wall lie on top of one another.

3. The packaging bag according to claim 2, wherein the sections of the first front wall that lie on top of one another extend, in an unfilled, flat state of the bag body, proceeding from a lower edge, in a vertical direction, up to a distance from a lower bag edge.

4. The packaging bag according to claim 3, wherein the distance amounts to between 3 mm and 10 mm.

5. The packaging bag according to claim 1, wherein an adhesive strip that extends in a transverse direction of the bag body is arranged in the adhesive region on the first front wall, in order to glue the stand-up bottom.

6. The packaging bag according to claim 1, wherein a hot-melt adhesive is used as an adhesive.

7. The packaging bag according to claim 1, wherein the varnish coating is a matte varnish; and wherein the flat web has a gloss level of less than 70 GU (gloss units) measured according to DIN 67530 at a light incidence angle of 60° in regions on the outside that have the varnish coating.

8. The packaging bag according to claim 7, wherein the flat web has a gloss level of less than 50 GU (gloss units) measured according to DIN 67530 at the light incidence angle of 60° in the regions.

9. The packaging bag according to claim 1, wherein the flat web is configured in multiple layers and has a layer of a material selected from the group of polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polylactide (PLA), and paper; and wherein the layer of material borders on the varnish coating.

10. The packaging bag according to claim 1, wherein the bag body has first and second side folds arranged between the first and second front walls; and wherein sections of the first and second side folds (are folded over in the bottom section to form the stand-up bottom.

11. The packaging bag according to claim 1, wherein the adhesive region of the first front wall is at a distance from lateral edges of the bag body.

12. The packaging bag according to claim 1, wherein the adhesive region is pre-treated using a corona method.

13 A method for production of the packaging bag according to claim 1, the method comprising: supplying a flat web in a machine direction, wherein the flat web has first and second regions arranged next to one another, forming the first and second front walls, respectively, wherein the flat web is provided with a coating on a first side, and wherein an adhesive region of the first region that forms the first front wall is free of a coating; forming a film tube from the flat web, by folding and heat-sealing, so that at least certain sections of the first and second front walls lie on top of one another; cutting individual bag bodies from the film tube; forming a stand-up bottom by folding over the bag body in a lower region of the bag body so that sections of the adhesive region of the first front wall lie on top of one another; and gluing to one another the sections that lie on top of one another.

14. The method according to claim 13, wherein side folds arranged between the first and second front walls are formed by folding the flat web.

15. The method according to claim 13, wherein an adhesive is applied to the first front wall in the adhesive region before forming the stand-up bottom.

16. The method according to claim 15, wherein the adhesive is a hot-melt adhesive.

17. The method according to claim 15, wherein the adhesive is arranged in strip form.

18. The method according to claim 13, wherein the adhesive region is at a distance from a lower bag edge after the bag body has been cut off.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other objects and features of the invention will become apparent from the following detailed description considered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.

[0038] In the drawings,

[0039] FIG. 1 shows a packaging bag according to the invention; and

[0040] FIGS. 2 to 6 show method steps for the production of the packaging bag shown in FIG. 1.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0041] FIG. 1 shows a packaging bag according to the invention, having a bag body 2 formed from a flat web 1 (see FIG. 2), wherein the bag body 2 is formed from a first and second front wall 3, 4 as well as side folds 5a, 5b that are arranged between them. Furthermore, the bag body 2 has a stand-up bottom 6 in a bottom section, which bottom is formed by means of folding over and gluing together the front walls 3, 4, and this bottom 6 accordingly has a bottom fold 7 (see FIG. 6).

[0042] Furthermore, a perforation 8 is provided in a head region arranged at the upper end, by way of which perforation the bag body 2 can be opened by means of tearing open the flat web 1. For renewed closing, a resealable closure 9 is furthermore provided, which closes the bag body 2 off again by means of pressing the front walls 3, 4 together.

[0043] For the invention, the embodiment of the stand-up bottom 6 with the bottom fold 7 is of particular importance. The embodiment and formation of the stand-up bottom 6 in this regard can be explained particularly clearly and in greater detail using the production of the packaging body.

[0044] In this regard, FIG. 2 shows the flat web 1, which is supplied in the machine direction MD. The flat web 1 is configured in such a manner that regions 10, 11 are provided, which will later form the front walls 3, 4. Furthermore, regions 12a, 12b are provided, which will form the side folds 5a, 5b by means of folding the flat web 1 over.

[0045] The flat web 1 is configured in multiple layers and has a layer of polyethylene that forms the inside, and a layer of polyethylene terephthalate that forms the outside. In order to be able to impart an optically high-quality appearance to the packaging bag after production, the flat web 1 has a coating composed of a matte varnish on the side that forms the outside of the packaging bag, i.e. on the layer of PET. Such a matte varnish, however, has the disadvantage that it has a detrimental effect on the adhesive effect of an adhesive, in particular of a hot-melt adhesive. Against this background, an adhesive region 13, which is configured to be free of a coating with matte varnish, is provided in the region 10 of the flat web 1. In this connection, the region 10 represents the region of the flat web 1 that will later form the first front wall 3. In this connection, reference is made to FIG. 3 for a better representation; it shows the film web in an enlarged manner of representation.

[0046] Then a perforation 8 can also be introduced into the flat web 1, and a resealable closure 9 can be attached.

[0047] The configuration of the stand-up bottom 6 is shown in greater detail in FIG. 4 to FIG. 6. FIG. 4 shows the bag body 2, cut off from the film tube, in a view in which the frontmost front wall 3 represents the front side of the bag body 2. By way of a heat-sealing seam 14a, the bag body 2 was closed off at a lower end, and the front walls 3, 4 were connected either directly with one another or by way of regions of the side folds 5a, 5b. Furthermore, heat-sealing seams 14b are also provided, which stabilize the side folds 5a, 5b.

[0048] In the embodiment shown in FIG. 4, the stand-up bottom 6 was not yet formed, so that accordingly, a bottom fold 7 has not yet been provided. FIG. 4 does show, however, the lower edge 15 of the bag body, which was formed by folding over the lower region of the bag body 2. This formation also means, at the same time, that sections of the adhesive region 13 lie against one another after being folded over.

[0049] An adhesive strip 16 is provided in the adhesive region 13, which strip is configured in caterpillar form and fixes the bottom fold 7 in place after it has been folded over, in that the sections of the adhesive region 13 are fastened onto one another. Then the actual folding over to form the bottom fold 7 takes place in FIG. 5.

[0050] The finished packaging bag is then shown in a flat-laid state in FIG. 6. Accordingly, the adhesive region 13 extends all the way to the lower edge 15 of the bag body 2. In the example shown, the distance from the lower bag edge 17 is 5 mm, and from the lateral edges it is 15 mm.

[0051] Although only a few embodiments of the present invention have been shown and described, it is to be understood that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.