Packaging bag as well as method for production
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.
1. A packaging bag having a bag body formed from a flat web, the bag comprising:
a first front wall;
a second front wall;
a heat-sealed seam that closes the bag body at a lower end by connecting the first front wall and the second front wall either directly or via side folds; and
a stand-up bottom formed in a bottom section of the bag body 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;
wherein the first front wall has an adhesive region kept free of the varnish coating in the bottom section of the bag body; and
wherein the flat web comprises a layer of a material selected from the group of polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polylactide (PLA), and paper that borders on the varnish coating, the varnish coating being in contact with the layer of material, 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.
2. The packaging bag according to claim 1 , 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.
3. The packaging bag according to claim 2 , wherein the distance amounts to between 3 mm and 10 mm.
4. 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.
5. The packaging bag according to claim 1 , wherein a hot-melt adhesive is used as an adhesive.
6. 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.
7. The packaging bag according to claim 6 , 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.
8. The packaging bag according to claim 1 ,
wherein the flat web is configured in multiple layers.
9. 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.
10. 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.
11. The packaging bag according to claim 1 , wherein the adhesive region is pre-treated using a corona method.
12. 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.
13. The method according to claim 12 , wherein side folds arranged between the first and second front walls are formed by folding the flat web.
14. The method according to claim 12 , wherein an adhesive is applied to the first front wall in the adhesive region before forming the stand-up bottom.
15. The method according to claim 14 , wherein the adhesive is a hot-melt adhesive.
16. The method according to claim 14 , wherein the adhesive is arranged in strip form.
17. The method according to claim 12 , wherein the adhesive region is at a distance from a lower bag edge after the bag body has been cut off.