PACKAGING BAG ON A PAPER BASIS, AS WELL AS METHOD FOR THE PRODUCTION OF A PACKAGING BAG

Abstract

A packaging bag has a bag body on a paper basis, which has front walls that lie opposite one another, side walls arranged between the front walls, and longitudinal edges that connect the front walls with the side walls. A material section that forms the assigned front wall and a material section that forms the assigned side wall, are connected with one another on the longitudinal edges to form a reinforcement fold that runs in the longitudinal direction, by way of a fixation layer that borders on each longitudinal edge. The fixation layer assigned to at least one of the reinforcement folds is an adhesive layer, wherein regions of the bag body between the reinforcement folds are free of an adhesive layer.

Claims

1. A packaging bag having a bag body formed of paper, the bag body having front walls that lie opposite one another, side walls arranged between the front walls, and longitudinal edges that connect the front walls with the side walls, wherein a material section that forms one of front walls and a material section that forms one of the side walls are connected with one another on one of the longitudinal edges by way of a fixation layer that borders on the longitudinal edge to form a reinforcement fold that runs in a longitudinal direction (L), wherein the fixation layer is an adhesive layer, and wherein regions of the bag body between reinforcement folds are free of an adhesive layer.

2. The packaging bag according to claim 1, wherein the adhesive layer is formed from a glue or from a hot-melt adhesive.

3. The packaging bag according to claim 1, wherein the adhesive layer is arranged, at least in part, within the reinforcement fold, and directly connects the material sections of the respective front wall and side wall directly with one another.

4. The packaging bag according to claim 1, wherein the adhesive layer is arranged outside of the reinforcement fold, at least in part, and at least one additional material ply formed of paper connects the material sections of the front wall and side wall with one another.

5. The packaging bag according to claim 4, wherein the at least one additional material ply is structured in strip form and extends only in the longitudinal direction in a region of the reinforcement fold.

6. The packaging bag according to claim 4, wherein the at least one additional material ply encloses the front walls and the side walls.

7. The packaging bag according to claim 4, wherein the at least one material ply comprises at least two material plies that are arranged one on top of the other.

8. The packaging bag according to claim 4, wherein at least one material ply extends into the reinforcement fold in certain sections.

9. The packaging bag according to claim 1, wherein the bag body or at least one layer of the bag body is formed from a kraft paper.

10. The packaging bag according to claim 1, wherein at least the front walls have a sealable coating in a head region and/or in a bottom region on an inner side of the bag body.

11. A method for the production of a packaging bag, comprising the following steps: supplying a material web in a production direction, pressing the material web in at multiple positions that are spaced apart from one another in a transverse direction, to form reinforcement folds, applying an adhesive layer to the material web in a region of each of the reinforcement folds, which layers fix the reinforcement folds in place in the material web, forming a material tube having front walls that lie opposite one another, side walls arranged between the front walls, and longitudinal edges that connect the front walls with the side walls by means of folding of the material web, and cutting off individual bag bodies from the material tube.

12. The method according to claim 11, wherein the adhesive layers are introduced into the reinforcement folds, at least in certain sections, and for fixation, material sections of the material web that lie opposite one another are directly connected with one another by way of the adhesive layer, in a region of the reinforcement folds.

13. The method according to claim 11, wherein one or more additional material plies are connected with the material web by way of the adhesive layers, wherein the material plies are arranged on the material web in such a manner that they cover the reinforcement folds.

14. The method according to claim 13, wherein multiple material plies are laid onto the material web, one on top of the other.

15. The method according to claim 11, wherein after the step of folding of the material web to form a material tube, an overlap region that runs along the production direction forms.

16. The method according to claim 11, wherein a heat-sealable coating is applied to an inner side of the bag body in multiple sections that are arranged one behind the other in the production direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] In the drawings,

[0040] FIG. 1 shows a packaging bag according to the invention; and

[0041] FIGS. 2A, 2B, 2C show the packaging bag according to FIG. 1 in a cross-section, with reinforcement folds formed in different ways.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0042] FIG. 1 shows a packaging bag having a bag body 1, which has front walls 2 that lie opposite one another, as well as side walls 3 arranged between the front walls 2, which connect the front walls 2 with one another, and wherein the front walls 2 and the side walls 3 border on one another by way of longitudinal edges 4.

[0043] Furthermore, the side walls 3 are configured with a side fold that divides the side walls 3 into two side fold halves, in each instance, which lie one on top of the other in the case of a bag body 1 that has been laid flat.

[0044] In order to impart greater rigidity to the bag body 1, reinforcement folds 5 are furthermore provided, which folds are assigned to one of the longitudinal edges 4, in each instance, and run in the longitudinal direction L.

[0045] The precise manner of the formation of the reinforcement folds 5 can be derived from FIG. 2A, 2B, 2C, wherein the packaging bag shown in FIG. 1 has reinforcement folds 5 that are configured in the manner of the left side of FIG. 2A. In this regard, it should be noted that the left side of FIG. 2A, 2B, 2C and the right side of FIG. 2A, 2B, 2C show different embodiment methods of a configuration of the reinforcement folds 5, in each instance, so that accordingly, only half of a bag body is shown in each embodiment, in each instance.

[0046] According to FIG. 2A, the packaging body 1 is formed by way of a tubular pre-blank, so that the material of the front walls 2 makes a homogeneous transition into the side walls 3 at the longitudinal edge 4. Excepted from this is the overlap seam 8, by way of which the bag body 1 is closed along the longitudinal direction L. In the example shown, the overlap seam 8 is arranged next to a reinforcement fold 5, wherein the fixation takes place by means of an adhesive. The overlap seam 8 is formed from a glue or dispersion adhesive. Fundamentally, however, this can also be a hot-melt adhesive, wherein a dispersion adhesive is preferred.

[0047] For formation of the reinforcement folds 5, according to FIG. 2A an adhesive layer 6 composed of a hot-melt adhesive contact adhesive is provided on the left side, in each instance, which layer is arranged at least in part within the assigned reinforcement fold 5, and connects the assigned material sections of the front wall 2 and of the side wall 3 directly with one another. A glue is also possible as an adhesive.

[0048] According to the right side of FIG. 2A, introduction of an adhesive layer 6 directly into the reinforcement fold 5 does not take place. Instead, an additional material ply 7 in strip form is fixed in place above an adhesive layer 6 outside of the reinforcement fold 5, on material sections of the front wall 2 and of the side wall 3, and thereby the reinforcement fold 5 is also held in position. The additional material plies 7 thereby cover an opening of the reinforcement fold 5 that runs in the longitudinal direction L, wherein regions between the additional material plies 7 are free of additional material.

[0049] In total, it is shown using FIG. 2A that in the case of the bag body 1, only fixation layers in the form of adhesive layers 6 are arranged in the region of the reinforcement folds 5, wherein regions of the bag body 1 between the reinforcement folds 5 are free of an adhesive layer 6. An embodiment without an adhesive layer 6 between the reinforcement fold 5 is particularly preferred within the scope of the invention. In particular, the reinforcement fold 5 can subsequently be cut open in a simple manner, in that the additional material plies 7 are removed or cut open.

[0050] This holds true in the same way for the embodiment variants of FIGS. 2B and 2C. According to FIG. 2B, an additional material ply 7 is also provided, but this is now not configured in strip form, but rather encloses the front walls 2 and the side walls 3 within the bag body 1. Thereby this additional material ply 7 represents the actual inner wall of the bag body 2, which stands in direct contact with the goods filled into it. According to the left side of FIG. 2B, this additional material ply 7 is connected with the assigned material sections of the front walls 2 and of the side walls 3 by way of an adhesive layer 6, in each instance, in the region of the corresponding reinforcement seam 5, wherein fixation of the reinforcement fold 5 in the manner of the embodiment form takes place on the right side of FIG. 2A. In contrast to the strip-shaped embodiment of the additional material plies 7, however, merely one continuous material ply 7, not multiple material plies 7 arranged next to one another, needs to be arranged on the material web that forms the bag body 1 during the course of production.

[0051] According to the right side of FIG. 2B, two material plies 7, 7′ are provided, which are arranged one on top of the other or one inside the other in the region of the reinforcement folds 5. In this regard, the point of departure is an embodiment according to the right side of FIG. 2A, wherein now a material ply 7′ that lies on the inside is additionally provided, which ply encloses the front walls 2 and the side walls 3. In order to be able to close off both the bag body 1 and the additional material ply 7′, overlap seams 8, 8′ are provided, wherein the overlap seam 8 closes off the bag body 1, and the overlap seam 8′ closes off the material ply 7′. In the example shown, the overlap seams 8, 8′ are formed from a glue or dispersion adhesive, wherein fundamentally a hot-melt adhesive is also conceivable as an alternative.

[0052] FIG. 2C shows a further embodiment variant, wherein this time, for the sake of simplicity, no overlap seams 8, 8′ are shown, wherein an arrangement can take place in a manner analogous to FIGS. 2A and 2B. The starting point for the embodiment according to FIG. 2C is formed by the representation on the left side of FIG. 2B, according to which an additional material ply 7 that encloses the front walls 2 and the side walls 3 is attached to the bag body 1 by way of an adhesive layer 6. For fixation, strip-shaped material plies 7′ as well as an adhesive layer 6 are then provided directly in the reinforcement fold 5, wherein the material plies 7′ are arranged in a manner analogous to the representation on the right side of FIG. 2A, but now fix the regions of the additional material ply 7 that reach into the reinforcement fold 5 in place in this position and stabilize them.

[0053] All the bag bodies 1 shown are furthermore formed entirely of paper, wherein this is a kraft paper. Fundamentally, however, it is also possible that the outer side, for example, is formed from a coated paper; this is of particular advantage with regard to imprintability.

[0054] 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.