BAGS, ESPECIALLY SHIPPING BAGS, WITH AT LEAST ONE ADHESIVE AGENT

Description

[0001] The present invention relates to bags, in particular shipping bags, comprising at least one adhesive agent. Furthermore, the invention relates to the use of these bags for shipping foodstuffs.

[0002] Shipping bags are used in a variety of ways in the logistics industry. These bags are typically made of plastic to adequately protect the goods from external influences such as moisture. Paper bags, for example, do not offer comparable protection against moisture and are generally not used as shipping bags. Furthermore, shipping bags made of plastic film, when sealed with suitable adhesives or by heat sealing, can be very reliably sealed to prevent them from being opened without damage. To facilitate opening such shipping bags, perforation lines are often placed next to the adhesive strips in the opening area. This design is generally not applicable to paper bags.In particular, with paper bags, it is not as reliably guaranteed as with plastic shipping bags that unauthorized opening of a sealed bag can be detected. Furthermore, adequate protection of the opening, especially against tearing, is often not ensured. While it is possible to seal bags and simply tear them open (similar to an envelope), this method does not create a defined and stable opening. Neither the size nor the position of the opening is standardized.

[0003] WO 2008 / 022308 A2 discloses a resealable packaging comprising a first wall and a second wall connected to the first wall to form a package suitable for filling and closing, wherein the packaging has a foldable section adjacent to an opening of the packaging, the foldable section being foldable for closing and sealing the packaging. The foldable section includes a tamper-evident structure comprising an adhesive tape attached to the foldable section and adhering to the first wall while the foldable section is folded to close and seal the packaging. Such packaging is intended to protect against unintentional tampering.

[0004] GB 2 070 564 A refers to a bag with two opposing flat surfaces, wherein on one outer surface at or near the edge of the bag opening a first area of ​​contact adhesive is located, and on the other outer surface a second, corresponding area of ​​contact adhesive is located, which is generally arranged parallel to the first area but offset from its outermost boundary by two area widths. Such bags should be able to be stacked and separated without the risk of sticking together.

[0005] US 4,937,040 A discloses a security bag for receiving items, comprising a first wall and a second wall, the walls being joined to form sides and a bottom of the bag. The bag further comprises an opening providing access to the interior. The bag also includes an adhesive sealant that adheres to the first wall and is capable of joining the walls together to seal the opening of the bag, the adhesive sealant being effective at temperatures significantly below room temperature.The adhesive closure further comprises tamper-evident features, which include a layer of low-adherent material applied in close surface contact with the first wall, the second wall, and the adhesive closure itself. These features are designed to produce visually perceptible indications on the outside of the bag after the adhesive closure has bonded the walls together and the walls are separated at temperatures significantly below room temperature to open the bag. A bag with such an adhesive closure is intended to indicate from the outside whether the bag has been sealed and reopened.

[0006] Finally, EP 1 296 306 A2 discloses the use of a multilayer adhesive tape with a carrier based on a stretched thermoplastic film, an upper surface and a lower surface, on the lower surface of which at least the following layers are applied: a) a primer layer not applied over the entire surface, wherein the primer layer is anchored to the thermoplastic film, b) a release layer applied over the entire surface over the applied primer layer and the free thermoplastic film surface, wherein the release layer is more strongly anchored to the primer layer than to the thermoplastic film, and c) an adhesive compound applied over the entire surface to the release layer, which is more strongly anchored to the release layer than the release layer is to the thermoplastic film, for sealing shipping bags, pouches, envelopes, and packages. Such an adhesive tape is intended to make it possible to indicate unauthorized opening of packaging.

[0007] Accordingly, the following invention was based on the objective of providing bags that are not afflicted with the disadvantages of the prior art and that, in particular, allow an unauthorized opening of a sealed bag to be detected without doubt.

[0008] The problem is solved by a bag, in particular a shipping bag, with a substantially closed bottom end and an opposite opening end, comprising a bag front wall and a bag back wall, which are connected to each other at least partially, preferably completely, directly or indirectly, in particular via at least one wall, in particular at least one side wall for connecting the side edges and / or at least one bottom wall for connecting the bottom edges, and / or at least one fold, in particular at least one side fold for connecting the side edges and / or at least one bottom fold for connecting the bottom edges, in the area of ​​their opposing first and second side edges and bottom edges, wherein the bag is equipped with an opening edge of the bag front wall and an opening edge of the bag back wall, which in particular run substantially in the same direction.preferably wherein a bag opening is limited and / or defined by said two opening edges, wherein the bag is further equipped with at least one first fold or first weakening line, in particular a perforation line, in the bag front wall, which extends at a first mean distance from the opening edge of the bag front wall from the first side edge or spaced from the first side edge to the second side edge or in the direction of the second side edge, wherein a region of the bag front wall and a region of the bag back wall from the opening edge of the bag front wall to the first fold or first weakening line of the bag front wall form a first fold section,in particular an area of ​​the bag front wall from the opening edge of the bag front wall to the first fold or first weakening line of the bag front wall and an area of ​​the bag back wall from the opening edge of the bag back wall to the first fold and first weakening line of the bag back wall, wherein the bag is further equipped with at least one second fold or second weakening line, in particular a perforation line, in the bag front wall, which extends at a second mean distance from the opening edge of the bag front wall from the first side edge or spaced from the first side edge to the second side edge or in the direction of the second side edge, wherein the second mean distance from the opening edge of the bag front wall is greater than the first mean distance from the opening edge of the bag front wall,wherein a region of the bag front wall and a region of the bag back wall from the first fold or the first weakening line of the bag front wall to the second fold or second weakening line of the bag front wall form a second fold section, in particular a region of the bag front wall from the first fold or the first weakening line of the bag front wall to the second fold or second weakening line of the bag front wall and a region of the bag back wall from the first fold or the first weakening line of the bag back wall to the second fold or second weakening line of the bag back wall, further comprising at least one adhesive agent, in particular with a split film, wherein the adhesive agent is indirectly or directly attached to the bag front wall or the bag back wall with a first adhesive side and is partially or completely, in particular partially,extending from the first to the second lateral edge or at least sectionally between the first and second lateral edge of the bag front wall or bag back wall, in particular from the first to the second lateral edge, wherein the at least one adhesive is designed and configured to join the bag front and bag back wall together, in particular to join the first folded section of the bag front wall to the bag back wall or the first folded section of the bag back wall to the bag front wall.

[0009] This has the advantage that the bag is inexpensive to produce and can be securely sealed. The multiple folds at the opening end during closing, along with the adhesive, stabilize this end, effectively preventing accidental opening, for example in an accident.

[0010] It is preferred if the first and / or second weakening line is at least mostly or entirely straight, wavy, needled, or zigzag-shaped, particularly straight and / or needled. This is especially suitable for folding.

[0011] In one embodiment, the weakening lines, particularly the first and / or second weakening line, are designed to reduce resistance to folding, meaning less force is required for folding. While it is theoretically possible to provide a weakening line that weakens the material of the bag's front or back wall to such an extent that tearing for accessing the bag is possible, this is a secondary aspect of the invention and not desirable. It is preferable for the weakening line to be designed and configured to effect a folding movement, rather than to tear the bag's front or back wall.Therefore, it is further preferred if the force required to separate the bag's front wall from the bag's back wall in the area of ​​the adhesive is less than the force required to separate the bag at the weakening line, especially when, in the case of a closed bag, tensile forces act on the first weakening line orthogonally to the bag's front wall (so that in this case not the first weakening line but the adhesive is destroyed).

[0012] The at least one first fold and / or first weakening line, as well as the at least one second fold and / or second weakening line, are preferably each a perforation line that simultaneously forms a fold edge. This is hereinafter referred to as a fold perforation, so that the first fold and first weakening line constitutes a first fold perforation and the second fold and second weakening line constitutes a second fold perforation. Fold perforations are surprisingly easy to fold, making closure particularly smooth.

[0013] It is also preferred if the prey front wall and the bag back wall each have the first fold and / or first weakening line, preferably such that the first fold and / or first weakening line of the prey front wall is opposite the first fold and / or first weakening line of the bag back wall, at least when the bag is spread flat (i.e., unfilled). Furthermore, it is preferred if the prey front wall and the bag back wall each have the second fold and / or second weakening line, preferably such that the second fold and / or second weakening line of the prey front wall is opposite the second fold and / or second weakening line of the bag back wall, at least when the bag is spread flat (i.e., unfilled). This further facilitates folding and is particularly cost-effective to manufacture, as the perforation in the prey front wall and bag back wall can be produced simultaneously.

[0014] Furthermore, it is preferred if the at least one adhesive and / or the first fold and / or second fold run substantially parallel to the opening-side edge of the bag's front wall and / or back wall.

[0015] In a further embodiment, it is preferred if the at least one adhesive is arranged adjacent to the first fold and / or the first weakening line or to the second fold and / or the second weakening line, preferably adjacent to the second fold and / or the second weakening line. It has been shown that this ensures a particularly secure closure, while improving the stiffening of the bag at the top. Particularly preferred is the adhesive being arranged adjacent to the first fold and / or the second weakening line, as described above, with an average distance of less than 10 mm, and particularly less than 5 mm.

[0016] Preferably, the first folding section has a bag back wall portion formed by the bag back wall and a bag front wall portion formed by the bag front wall, wherein the second folding section has a bag back wall portion formed by the bag back wall and a bag front wall portion formed by the bag front wall.

[0017] The adhesive is designed to be bonded to the front or back wall of the bag by means of adhesive forces and comprises a split film which is designed and configured to split upon separation of the front and back walls of the bag in the area of ​​the split film into at least a first component of the split film on the front wall of the bag and at least a second component of the split film on the back wall of the bag, wherein the first component is irreversibly delaminated from the second component, in particular substantially parallel to the front wall of the bag. Preferably, the components are opposing layers of the split film.

[0018] Although it is possible to split the foil completely cleanly, resulting in a first component that—apart from its thickness—has the same dimensions as the foil, and a second component that—apart from its thickness—also has the same dimensions, it has proven advantageous if the splitting occurs in such a way that the first and second components have irregular edges, and in particular, are not of the same size. Preferably, the splitting occurs in such a way that the first and second components—similar to a fingerprint—assume an individual and / or irregular shape upon delamination, so that an opened bag can be identified by the shape of the components of the split foil. This can be described as an individual delamination characteristic. This has the advantage that it is not easily possible to replace a bag without the user noticing.

[0019] Preferably, the at least one adhesive is at least one single-sided or double-sided adhesive strip, in particular exactly one single-sided or double-sided adhesive strip. This may consist of several adhesive strips arranged side by side. Preferably, however, it is exactly one adhesive strip, and the bag does not include any further adhesive strips. The at least one adhesive strip preferably extends between the opposite first and second side edges, in particular orthogonally to these, preferably such that the ends of the adhesive strip have a mean distance of at least 1 cm, in particular at least 3 cm, and preferably at least 5 cm, from the side edges.

[0020] In a first embodiment of the invention, it is provided that the at least one adhesive means comprises at least one single-sided or double-sided adhesive strip with a first and second adhesive side and is fixed on the front wall of the bag, preferably wherein the adhesive strip is located at a third mean distance from the opening edge of the front wall of the bag, which is greater than the second mean distance from the opening edge of the front wall of the bag, and the back wall portion of the bag of the first folding section, after folding the first folding section onto the second folding section, is connectable or joined with an adhesive side, in particular the second adhesive side, of the at least one adhesive means, in particular irreversibly, by means of the front wall portion of the bag of the first folding section being in contact with the front wall portion of the bag of the second folding section.

[0021] In a second embodiment of the invention, it is provided that the at least one adhesive means comprises at least one single-sided or double-sided adhesive strip with a first and second adhesive side and is fixed on the back wall of the bag, preferably wherein the adhesive means is located at a third mean distance from the opening edge of the back wall of the bag, which is greater than the second mean distance, and the front wall portion of the bag of the first folding section, after folding the first folding section onto the second folding section, is connectable or joined with an adhesive side, in particular the second adhesive side, of the at least one adhesive means, in particular irreversibly, with the back wall portion of the bag of the first folding section in contact with the back wall portion of the bag of the second folding section.

[0022] In a third embodiment of the invention, it is provided that the at least one adhesive means comprises at least one single-sided or double-sided adhesive strip with a first and second adhesive side and is fixed on the front wall of the bag in the first folding section, preferably wherein the adhesive means is located at a fourth mean distance from the opening edge of the front wall of the bag, which is smaller than the first mean distance from the opening edge of the front wall of the bag, and the back wall of the bag, in particular a region of the back wall of the bag with a third mean distance from the opening edge of the back wall of the bag, is connectable or joined, in particular irreversibly, to an adhesive side, in particular the second adhesive side, of the at least one adhesive means after the first folding section is folded onto the second folding section, with the back wall portion of the bag of the first folding section abutting the back wall portion of the bag of the second folding section.

[0023] In a fourth embodiment of the invention, it is provided that the at least one adhesive means comprises at least one single-sided or double-sided adhesive strip with a first and second adhesive side and is fixed on the bag back wall in the first folding section, preferably wherein the adhesive means is located at a fourth mean distance from the opening edge of the bag back wall, which is smaller than the first mean distance from the opening edge of the bag front wall, and the bag front wall, in particular a region of the bag front wall with a third mean distance from an opening edge of the bag front wall, is connectable or joined, in particular irreversibly, to an adhesive side, in particular the second adhesive side, of the at least one adhesive means after the first folding section is folded onto the second folding section, with the bag front wall portion of the first folding section abutting the bag front wall portion of the second folding section.

[0024] The four embodiments mentioned above can be combined as desired with the features and / or embodiments discussed above and below according to the present invention. Preferably, the third distance is larger than the second distance and / or the fourth distance is smaller than the first distance from the opening edge of the bag's front and / or back wall.

[0025] Preferably, the first and second folding sections have substantially identical dimensions. This has the advantage of a more secure closure. Substantially identical dimensions means that the deviation of the surfaces is less than 25%, in particular less than 15%, preferably less than 10%, and more preferably less than 5%, and / or that the larger surface area is not more than 25%, in particular not more than 15%, preferably not more than 10%, and more preferably not more than 5% larger than the smaller surface area.

[0026] Preferably, the first and second folds and / or the first and second weakening lines are arranged to run essentially parallel to each other, with the first and second folds and / or the first and second weakening lines, which are essentially in the same direction, preferably having an average distance from each other in the range of 5 mm to 5 cm, in particular in the range of 1 cm to 3 cm.

[0027] Irreversible splitting within the meaning of the invention means that the adhesive cannot be removed or reversibly split without damage, but is destroyed upon splitting, and in particular can no longer perform its original adhesive function for bonding the front and back walls of the bag. It is particularly preferred if the adhesive no longer exhibits any significant adhesive effect after opening. The bag therefore preferably cannot be resealed with the adhesive. In a further embodiment, it is particularly preferred if the strength of the adhesive forces is reduced by at least 80%, in particular at least 90%, preferably at least 95%, after irreversible splitting, compared to an unused adhesive. The adhesive strength is tested according to the European standard EN 1939:2003.

[0028] A mean distance to a side edge within the meaning of the present invention is preferably an average distance, which is determined in particular substantially parallel to the opening edge of the bag front wall and / or parallel to a longitudinal extension of the adhesive and / or orthogonal to the first side edge of the bag front wall. A mean distance to an opening edge within the meaning of the present invention is preferably an average distance, which is determined in particular orthogonal to the opening edge of the bag front wall and / or orthogonal to a longitudinal extension of the adhesive and / or parallel to the first side edge of the bag front wall.

[0029] A split film according to the invention is a layer that can be split, particularly substantially parallel to its surface area, i.e., the film is separated into opposing layers. One way to ensure splitability is the coextrusion of several film layers, so that the layers of the film can later be separated again. These could be, for example, coextruded polyethylene films. A foamed film, for example made of polystyrene, or a foam film, for example made of polyurethane, is also conceivable. Many foams are characterized by low strength, which can be used to facilitate splitting. Nonwovens are also conceivable and are likewise characterized by low strength.

[0030] The slit film has, entirely or at least partially, in particular predominantly and / or in at least one layer of the slit film, an average density of less than 0.85 g / cm³, in particular less than 0.8 g / cm³, preferably less than 0.75 g / cm³, and most preferably less than 0.65 g / cm³. Slit films have proven advantageous which, entirely or at least partially, in particular predominantly, have average densities of 0.1 to 0.8 g / cm³, in particular 0.25 to 0.75 g / cm³, preferably 0.35 to 0.7 g / cm³, and most preferably 0.45 to 0.65 g / cm³. These average densities are significantly lower than the usual densities of plastic films, for example, of pure HDPE films and LDPE films. Surprisingly, it has been shown that particularly good cleavage foils are obtained due to the low density.The aforementioned low densities can be selectively achieved, among other things, by the inclusion of cavities, the choice of fillers, the choice of polymers, and / or the degree of cross-linking. In particular, gap films with cavities, especially those described below, have proven suitable. A gap film with a density that only partially corresponds to the density mentioned above can be produced, for example, by co-extruding a core with one of the densities mentioned above, for example, a density of 0.55 g / cm³, with films of higher density. In this case, the core area has the aforementioned density, for example, 0.55 g / cm³, within the gap film, while the co-extruded films surrounding the core can have a higher density, preferably significantly higher, for example, 0.95 g / cm³, and in particular, an average density of the co-extruded films of more than 0.85 g / cm³.This can facilitate the processing of the film, and surprisingly, it has been shown that a low core density can ensure very good cleavage, even if other film layers have a higher density. Alternatively, it is also possible to extrude only a film with a density of < 0.55 g / cm³, such a film being easily cleaved across its entire diameter. In a particularly advantageous embodiment, the cleavage film predominantly exhibits one of the aforementioned maximum densities or density ranges, i.e., in an area comprising more than 50% of the film's volume. In another particularly advantageous embodiment, the cleavage film additionally or alternatively exhibits one of the aforementioned maximum densities or density ranges in at least one layer. It has been shown that these areas, and especially these layers, can then be cleaved particularly well longitudinally.The entire gap film can also have an average density that corresponds to one of the maximum densities or density ranges mentioned above.

[0031] Preferably, the slit film comprises cavities, in particular cavities that are smaller than the thickness of the slit film, and / or have an average diameter of less than 200 µm, in particular less than 110 µm, more preferably less than 80 µm, and most preferably less than 50 µm. In a particularly suitable embodiment, some or all of the cavities are substantially ovoid, in particular spherical, and / or have a convex surface (concave when viewed from the inside). A volume of the cavities of less than 5 x 10⁶ µm³ is also preferred, in particular less than 5 x 10⁵ µm³, and more preferably less than 5 x 10⁴ µm³. It has been shown that said cavities can weaken the slit film, which significantly improves its cleavage.

[0032] The split film is a cavitated thermoplastic extruded plastic film or a multilayer coextruded plastic film. In said thermoplastic plastic film, air or another gas is preferably introduced during extrusion, particularly coextrusion, leading to the generation of cavitations in the cavitated thermoplastic extruded plastic film. The introduction of air or gas occurs either directly, by supplying gas or air during coextrusion, or by using a blowing agent that releases gas or air during or after coextrusion, in particular wherein the split film includes a blowing agent for this purpose. Such films are particularly easy to split, and this also applies to monoextruded films. Coextruded multilayer split films are discussed in more detail below.

[0033] In one embodiment, the split film is composed entirely or predominantly of several adjacent, co-extruded, multilayer plastic sheets. It has been shown that co-extruded multilayer split films, particularly those comprising polyethylene, are especially suitable for controlled, irreversible delamination, particularly resulting in a unique delamination pattern. Therefore, these are often avoided in shipping bags to prevent accidental opening. Surprisingly, it has been found that splitting the film upon opening and secure resealing can be effectively achieved with the split film described above.

[0034] The slit film is a plastic film. Preferably, it is a thin layer with a thickness of less than 0.3 cm, particularly less than 0.2 cm, and preferably less than 0.1 cm. Particularly suitable embodiments of the slit film have thicknesses of 30 to 500 µm, particularly 60 to 200 µm, and most preferably 80 to 150 µm. Particularly suitable materials for slit films are, in principle, polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl chloride, various polyesters, and polycarbonate, or also mixtures or multilayer composites of several of the aforementioned plastics.

[0035] The adhesive preferably also has a thickness that is composed of the gap film and any other layers that may be present, in particular possibly also the first and second adhesion layers. This thickness is preferably in the range of 80 to 800 µm, particularly 100 to 300 µm, and most preferably 120 to 180 µm.

[0036] The thickness of the adhesive and / or the split film is less than the thickness of the bag's front and back walls, in particular where the thickness of the bag's front wall is at least 50%, and especially at least 100%, greater than the thickness of the adhesive and / or the split film. The same applies to the bag's back wall. This reduces the risk of the bag's front or back wall tearing instead of the strip when separating the front and back walls in the area of ​​the adhesive. The goal is not to create a hole in the bag's front or back wall, but rather to break the bond with the adhesive. The former would significantly impair the bag's further use. Food is often stored in the bag until it is consumed. Only then is the bag disposed of or recycled.

[0037] The basis weight of the slit film is preferably in the range of 20 to 200 g / m², in particular 30 to 120 g / m², and especially preferably 40 to 80 g / m². It has been shown that such films are particularly suitable for delamination.

[0038] Preferably, the bag according to the invention comprises at least one first fold and / or first weakening line, in particular a perforation, in the bag's front wall and / or back wall, which extends at a first mean distance from the opening edge of the bag's front wall and / or back wall from the first side edge, or from the first side edge to the second side edge, or in the direction of the second side edge, wherein a region of the bag's front wall and a region of the bag's back wall from the opening edge of the bag's front wall and / or back wall to the first fold and / or first weakening line of the bag's front wall and / or back wall form a first folded section. In this embodiment, it is particularly preferred that at least one second fold and / or second weakening line, in particular a perforation, in the bag's front wall and / or back wall is also included.which extends at a second mean distance from the opening edge of the bag front wall and / or the opening edge of the bag back wall from the first side edge, or spaced from the first side edge to the second side edge, or in the direction of the second side edge, wherein the second mean distance from the opening edge of the bag front wall and / or bag back wall is greater than the first mean distance from the opening edge of the bag front wall and / or bag back wall, wherein a region of the bag front wall and a region of the bag back wall from the first fold and / or the first weakening line of the bag front wall and / or bag back wall to the second fold and / or second weakening line of the bag front wall and / or bag back wall form a second fold section.

[0039] In a further embodiment, the second mean distance is at least twice as large as the first mean distance, in particular at least twice to a maximum of three times, preferably a maximum of 2.5 times, as large as the first mean distance.

[0040] In a preferred embodiment, it is provided that the first component is a first plastic layer of the split film and the second component is or comprises a second plastic layer of the split film, which are plastic layers arranged at least partially opposite each other, preferably lying flat against each other, in the area of ​​the split film before the irreversible separation of the bag front wall from the bag back wall, in particular wherein the plastic layers are of different sizes, in particular having different surface areas.In a preferred embodiment, the at least one adhesive agent is an adhesive strip comprising the split film, which is connected to the front and back walls of the bag by means of adhesive forces. The adhesive strip, and in particular its material stability, is designed and configured such that, when the front wall of the bag is separated from the back wall, particularly completely, at least the first component of the adhesive strip remains on the front wall of the bag and at least the second component remains on the back wall of the bag. The adhesive strip can be multi-layered from the outset, or the first and second components can form only during separation.

[0041] Preferably, the at least one adhesive is an adhesive strip, in particular an adhesive strip comprising the split film, which is connected to the front and back walls of the bag by means of adhesive forces, wherein the adhesive forces are greater than the forces required to tear the adhesive strip in the area of ​​the adhesive strip when separating the front wall from the back wall of the bag and / or to separate the plastic layers of the adhesive strip. Tearing can mean a separation of plastic layers, in particular parallel to the adhesive surface, and / or tearing perpendicular to the adhesive surface, i.e., the split strip is cut perpendicular to the adhesive surface. In a preferred embodiment, both are provided, since it has surprisingly been found that in this case it is particularly difficult to conceal unauthorized opening.Furthermore, the geometry of the adhesive tape residue is often unpredictable, making it difficult to identify a bag based on this residue. This makes it harder to replace a bag opened by an authorized user with one opened without authorization. Once opened, the bags are preferably unique due to individual delamination characteristics, particularly of the gap film.

[0042] Preferably, the at least one adhesive layer comprises a first adhesive layer, which includes or forms the first adhesive surface, a second adhesive layer, which includes or forms a second, in particular opposite, adhesive surface of the adhesive layer, and at least one intermediate layer arranged between the first and second adhesive layers, wherein the at least one intermediate layer is or comprises the gap film. Here, the at least one intermediate layer represents the gap film and is a carrier for the first and second adhesive layers.

[0043] In a suitable embodiment, the intermediate layer can comprise at least one adhesion promoter layer in addition to the release liner. The adhesion promoter layer can, in particular, be a mineral coating, preferably a kaolin coating. Preferably, both sides of the release liner are coated in such a way that the bond to the adhesive layer is strengthened. This facilitates the release of the release liner, as it more effectively prevents the release of the adhesive forces between the release liner and the adhesive layer.

[0044] Preferably, the adhesive comprises a pressure-sensitive adhesive, in particular a permanently and / or irreversibly bonding adhesive. In some embodiments, the first and / or second adhesion layer comprises said pressure-sensitive adhesive. Preferably, the gap film is coated on at least one side, and in particular on both sides, with an adhesive, in particular a pressure-sensitive adhesive.

[0045] Suitable adhesives include acrylate adhesives, adhesives based on natural or synthetic rubber, silicone-based adhesives, and polyolefin adhesives. Adhesives suitable for use in the food industry are particularly preferred. Adhesives based on natural or synthetic rubber have proven to be especially adhesive, resulting in exceptionally reliable splitting of the slit film. Acrylate adhesives are also particularly suitable, especially due to their excellent splitting properties combined with above-average processability, thus enabling particularly cost-effective production.

[0046] The adhesive application weight, i.e., the mass of adhesive per unit area, is preferably 8 to 100 g / m², more preferably 12 to 60 g / m², more preferably 16 to 30 g / m², and more preferably 18 to 25 g / m². It has been shown that if adhesive quantities are selected beyond the aforementioned ranges, particularly beyond the aforementioned preferred ranges, the splitting and / or processability, especially die-cutting with a die during manufacturing, is less reliable.

[0047] A layer within the meaning of the invention can, for example, be a plastic layer or an adhesive layer. Although plastics and adhesives are not mutually exclusive, a layer consisting solely of adhesive within the meaning of the invention is not understood to be a plastic layer, but rather an adhesive layer. A plastic layer is a layer that comprises plastic, preferably a plastic film, in particular the gap film.

[0048] Alternatively or additionally, it would also be conceivable to provide an adhesive with adjacent segments, where some segments adhere better to the front wall of the bag and others better to the back wall. In this case, when separating the front and back walls of the bag, it is not necessarily the case that the adhesive separates the layers of plastic that are bonded together across the entire surface, but rather adjacent segments. This corresponds to a separation perpendicular to the adhesive surface, although a substantially parallel separation is also conceivable. A suitable, individual delamination characteristic is achieved particularly when combining both approaches.

[0049] Furthermore, it is preferred if the at least one adhesive and / or the first fold and / or second fold run substantially parallel to the opening-side edge of the bag's front wall and / or back wall.

[0050] In a suitable embodiment, it is provided that the at least one adhesive extends section by section between the first and second side edges and ends at a mean lateral distance from the first and second side edges, in particular a mean lateral distance that corresponds to at least 10% of the total distance between the first and second side edges.

[0051] Preferably, the split film has at least one weakening zone, in particular substantially parallel to the front wall of the bag, and especially wherein the first and second components are separably connected by the weakening zone. This weakening zone can be a contact zone between layers of the split film joined by co-extrusion. Weakening zones made of or containing foam or nonwoven fabric are also conceivable and suitable.

[0052] Furthermore, it is preferred if the at least one adhesive is spaced apart from the first and second edges, in particular with an average distance of at least 15% of the average distance between the first and second edges, preferably at least 30% of the average distance between the first and second edges. Surprisingly, it has been found that the adhesive, in particular the adhesive strip, does not need to extend over the entire length to ensure a secure closure. In this embodiment, therefore, edge areas of the bag remain without an adhesive, in particular an adhesive strip, so that there is a risk of unfolding in these areas. However, it has been found that unfolding can be prevented by folding the bag not just once, but multiple times, as already described.This stiffens the top edge of the bag to such an extent that opening it without destroying the adhesive, especially the adhesive strip, is no longer possible. This technical effect can be further enhanced by choosing a suitable type of paper (see below). The advantage of this method is that it is much easier to open the bag by grasping the folded-over section at the edge to release the adhesive. This is particularly important for elderly people who often have to purchase groceries through mail order.

[0053] For example, a single-sided or double-sided adhesive can be used. A double-sided adhesive, in particular a peelable adhesive strip, has proven suitable. However, it is also conceivable to use a single-sided adhesive, especially a single-sided adhesive strip, which, for example, is welded to the bag.

[0054] The adhesive can be composed of two parts, with the gap film preferably positioned opposite an adhesive layer of the adhesive. Preferably, the adhesive is described in the closed state of the bag, in which the two parts interact, resulting in a single-part adhesive. Thus, the adhesive has a two-part and a single-part state before and after the bag is sealed. When the bag is reopened, the adhesive is destroyed because the adhesive effect is no longer sufficient to reseal the bag.

[0055] A block bottom bag and / or a side-gusseted bag, especially a paper block bottom bag and / or a paper side-gusseted bag, has proven particularly suitable. A bag that combines the features of a block bottom and a side-gusseted bag is especially preferred. This significantly reduces the risk of food damage, as the block bottom creates a cavity that exerts little or no pressure on the bag's contents.

[0056] It is also preferably intended that the water absorption of the paper material, in particular paper, determined according to Cobb as per GOST 12605 (03 / 2001), is in the range of 15 to 45 g / m², preferably in the range of 20 to 35 g / m². It is virtually impossible to prevent food from releasing moisture. Surprisingly, it has been found that it is advantageous for the paper to absorb enough moisture to create a food-safe environment in the bag while simultaneously preventing the bag from becoming soggy. The latter is necessary to prevent the bag from tearing more easily.

[0057] Furthermore, it is preferred if the front and back walls of the bag, as well as, where applicable, the side walls and / or the bottom of the bag, are based at least substantially on paper material, in particular paper with a basis weight in the range of 60 to 100 g / m², as determined according to DIN EN ISO 536:2012-11, or at least partially comprise or are manufactured from such material. Paper with these properties has proven to be particularly durable. Furthermore, the weakening lines are especially well stabilized, thus preventing accidental tearing, while at the same time allowing for particularly good folding, especially at perforation lines.

[0058] Furthermore, it is preferred if the longitudinal extent of the bag's back wall, measured from the bottom end to the opening edge, is essentially the same as the longitudinal extent of the bag's front wall, measured from the bottom end to the opening end.

[0059] It is also preferred if the bag comprises first and / or second side wall elements between the first and second side edges of the bag front and bag back walls, in particular wherein the side wall elements are side folds which preferably extend from the bottom end of the bag front and bag back walls.

[0060] Furthermore, it is preferred if the transverse extent of the bag's back wall and front wall, measured from the first to the second side edge of the bag, is smaller than the longitudinal extent of the bag's front wall and / or back wall, measured from the bottom end to the opening end.

[0061] In a preferred embodiment, the problem is solved by a shipping bag with a substantially closed bottom end and an opposite open end, comprising a bag front wall and a bag back wall which are connected to each other, at least sectionally, directly or indirectly, in the area of ​​their opposing first and second side edges and bottom edges, wherein the bag has an opening edge of the bag front wall and an opening edge of the bag back wall which run in a substantially the same direction, wherein the bag is further equipped with at least one first fold and weakening line in the form of a perforation line in the bag front wall and in the bag back wall.which extends at a first mean distance from the opening edge of the bag front wall and the parallel opening edge of the bag back wall from the first side edge, or spaced from the first side edge to the second side edge, or in the direction of the second side edge, wherein a region of the bag front wall and a region of the bag back wall from the opening edge of the bag front wall and bag back wall to the first fold and first weakening line of the bag front wall and bag back wall form a first fold section, wherein the bag is further equipped with at least one second fold and second weakening line in the form of a perforation in the bag front wall and bag back wall,which extends at a second mean distance from the opening edge of the bag front wall and the parallel opening edge of the bag back wall from the first side edge, or spaced from the first side edge to the second side edge, or in the direction of the second side edge, wherein the second mean distance from the opening edge of the bag front wall and bag back wall is greater than the first mean distance from the opening edge of the bag front wall and bag back wall, wherein a region of the bag front wall and a region of the bag back wall from the first fold and the first weakening line of the bag front wall and bag back wall to the second fold and weakening line of the bag front wall and bag back wall form a second fold section, further comprising at least one adhesive in the form of a single-sided or double-sided adhesive strip, with a first and opposite second adhesive side,which is attached to the bag front wall or bag back wall with the first adhesive side and extends, in relation to the opening edge of the bag front wall and bag back wall, beyond the second fold and weakening line, sectionally or completely between the first and second side edges of the bag front wall or bag back wall, in particular from the first to the second side edge, wherein the at least one adhesive means is designed and configured to connect the first fold section of the bag front wall to the bag back wall.

[0062] Furthermore, it is preferred if the bag's front wall, back wall, bottom gusset, side walls and / or side gussets, in particular the front and back walls, and optionally the bottom gusset, side gussets and / or side walls, are based entirely or partially, and in particular substantially entirely or at least predominantly, on a paper material, especially paper. It has been shown that this results in a particularly long shelf life for the food and also allows for environmentally sound disposal of the bag, especially as paper waste.

[0063] It is also preferred if the bag is essentially and / or predominantly made in one piece, in particular, apart from the adhesive, if it is based on an essentially and / or predominantly single-piece paper web. This reduces manufacturing costs and is particularly environmentally friendly. This is especially significant for shipping bags, which are regularly produced in large quantities.

[0064] Furthermore, it is preferred if the at least one adhesive on the second adhesive side has at least one removable protective film. The protective film can also be a release or protective paper. Preferably, however, it is a plastic film, in particular a plastic film that protects the first and / or second adhesive layer until the bag is sealed. This protective film is optionally removed before the bag is sealed, in particular so that the first and / or second adhesive layer is exposed.

[0065] Preferably, the bag is a disposable shipping bag for food. A disposable shipping bag according to the invention is suitable, in terms of its design, manufacturing costs and / or disposal properties, for shipping by an online retailer of food products and the subsequent, in particular environmentally sound, disposal of the shipping bag, especially in paper recycling.

[0066] In one embodiment, the bag's front wall and / or back wall and / or optionally at least one side wall and / or bottom wall have perforations, at least in sections, and / or the bag's front wall and / or back wall have a multitude of openings, particularly breathable ones. These have proven especially effective for transporting food.

[0067] The opening edge of the bag's front wall and the opening edge of the bag's back wall, which run in a substantially similar direction, can preferably be arranged substantially parallel to each other. It is preferred that the mean distance between the opening edge of the bag's front wall and its bottom edge is equal to or differs from the mean distance between the opening edge of the bag's back wall and its bottom edge by no more than 10%, and in particular no more than 5%, especially if the opening edges of the bag, when closed with the adhesive according to the generic principle, come into contact with each other or are spaced less than 1 cm apart, in particular less than 0.5 cm, and preferably less than 0.2 cm.The edges of the openings are substantially aligned, preferably at least when the average distance is less than 5 cm and the orientation deviates by no more than 10° from a parallel alignment, and particularly when the average distance is less than 1 cm and / or the orientations deviate by no more than 2° from each other. Two elements or surfaces are substantially parallel when their respective orientations deviate by no more than 10°, particularly no more than 5°, and preferably no more than 1°, from a parallel alignment.

[0068] The invention further relates to the use of the bag for the transport, in particular shipping, of foodstuffs. It is preferably a shipping bag for foodstuffs.

[0069] The invention further relates to the use of a bag for food shipping with at least one adhesive agent designed and configured to close the bag by means of adhesive forces, wherein the adhesive strip is designed and configured such that, in particular when the front and back walls of the bag are completely separated in the area of ​​a gap film, at least a first component of the adhesive strip remains on the front wall of the bag and at least a second component remains on the back wall of the bag, wherein the first component is irreversibly delaminated from the second component, in particular substantially parallel to the front wall of the bag, in particular forming an individual delamination characteristic.

[0070] The present invention is based on the finding that secure sealing is possible with the mechanism described above. Furthermore, it has been established that by selecting a suitable adhesive, unauthorized opening cannot go unnoticed. This is particularly important in the food sector, as it is crucial for consumers that the food has not been handled by third parties. Hygienic considerations play a role here, as does the fear of poisoning by said third parties. Against this background, it is of particular importance for food products that it can be proven without any gaps that packaging, or in this case bags, especially shipping bags, has not been tampered with, opened, or had its contents altered. Moreover, by appropriately selecting the materials and designing the bag, a particularly secure yet easy-to-open closure can be achieved.

[0071] Further features and advantages of the invention will become apparent from the following description, in which exemplary embodiments of the invention are explained by means of schematic drawings, without thereby limiting the invention.

[0072] This shows Figure 1 shows the bag in an embodiment according to the invention, wherein the view with the front wall of the bag is shown; Figure 2 shows the bag from Figure 1 , where the view is shown with the bag's back wall, i.e., the bag has been turned over once; Figure 3 shows the bag of Figure 1, where only the upper part of the bag's front wall is shown; Figure 4 shows an alternative embodiment of the bag, where only the upper part of the bag's front wall is shown;Figure 5 shows a first embodiment of the adhesive before parallel splitting, wherein the bag walls are connected; Figure 6 shows the first embodiment of the adhesive after parallel splitting, wherein the bag walls have been separated; Figure 7 shows a second embodiment of the adhesive before parallel splitting, wherein the bag walls are connected; Figure 8 shows the second embodiment of the adhesive after parallel splitting, wherein the bag walls have been separated; Figure 9 shows a first variant of the first embodiment of the adhesive before parallel splitting, wherein the bag walls are not yet connected; Figure 10 shows a second variant of the first embodiment of the adhesive before parallel splitting, wherein the bag walls are not yet connected; Figure 11 shows a third embodiment of the adhesive before parallel splitting, wherein the bag walls are not yet connected.

[0073] Figure 1Figure 1 shows a bag 1, in particular a shipping bag, with a substantially closed bottom end 15 and an opposite opening end 17, comprising a bag front wall 5 with opposite first and second side edges 7, 8 and a bottom edge 9. The bottom edge 9' of the back of the block bottom bag is also visible. The bag front wall 5 has an opening edge 16 that is substantially aligned with the opening edge of the bag back wall (not shown). A first fold and / or first weakening line 2, which in this case is a perforation, in the bag front wall 5 has a first mean distance from the opening edge 16 of the bag front wall 5 and extends from the first side edge 7 to the second side edge 8, wherein the area of ​​the bag front wall 5 from the opening edge 16 of the bag front wall 5 to the first fold and / or first weakening line 2 of the bag front wall 5 forms a first fold section 21.wherein the bag is further equipped with at least a second fold and / or second weakening line 3, which in this case is a perforation, in the bag front wall 5, which extends at a second mean distance from the opening edge 16 of the bag front wall 5 from the first side edge 7 to the second side edge 8, wherein the second mean distance from the opening edge of the bag front wall 5 is greater than the first mean distance from the opening edge 16 of the bag front wall 5, wherein the area of ​​the bag front wall 5 from the first fold and / or the first weakening line 2 of the bag front wall 5 to the second fold and / or second weakening line 3 of the bag front wall forms a second fold section 23, further comprising an adhesive 11 in the form of a double-sided adhesive strip,which is attached to the bag front wall 5 with the first adhesive side and extends section by section or completely, in particular section by section, from the first to the second side edge 7, 8 with respect to the opening edge 16 of the bag front wall 5 beyond the second fold and / or second weakening line 3, wherein the at least one adhesive means 11 is designed and arranged to connect the bag front and bag back wall together, in particular the first folded section 21' of the bag back wall with the bag front wall 5 (cf. , Figure 2 ).

[0074] Figure 2 shows the opposite side of the bag Figure 1 , i.e. the bag back wall 4. Figure 2Figure 1 shows the bag 1, in particular a shipping bag, with a substantially closed bottom end 15 and an opposite opening end 17, comprising a bag back wall 4, with opposing first and second side edges 7', 8' and the bottom edge 9' of the bag back wall 4. The opening edge 16' of the bag back wall 4 is spaced at a first mean distance from a first fold and / or first weakening line 2' in the form of a perforation in the bag back wall 4, which extends at a first mean distance from the opening edge of the bag back wall 16' from the first side edge 7' to the second side edge 8', wherein the area of ​​the bag back wall 4 from the opening edge 16' of the bag back wall to the first fold and / or first weakening line 2' of the bag back wall 4 forms a first fold section 21.wherein the bag is further equipped with at least one second fold and / or second weakening line 3' in the form of a perforation in the bag back wall 4, which extends at a second mean distance from the opening edge 16' of the bag back wall 4 from the first side edge 7' to the second side edge 8', wherein the second mean distance from the opening edge 16' of the bag back wall 4 is greater than the first mean distance from the opening edge 16' of the bag back wall 4, wherein the area of ​​the bag back wall 4 from the first fold and / or the first weakening line 2' of the bag back wall 4 to the second fold and / or second weakening line 3' of the bag back wall 4 forms a second fold section 23.

[0075] Figure 3 shows a section of the pouch's anterior wall Figure 1, namely the upper end with the first and second fold sections 21, 23. A first weakening line 2 in the bag front wall 5 extends at a first mean distance A1 from the opening edge 16 of the bag front wall 5. A second weakening line 3 extends at a second mean distance A2 from the opening edge 16 of the bag front wall 5. The adhesive 11 extends at a third mean distance A3 from the opening edge 16 of the bag front wall 5. The mean distance A1 is the smallest and A3 is the largest labeled mean distance within the figure of Fig. 3 . When the front wall of the bag 5 is folded in accordance with the invention, the adhesive 11 comes into contact with the back wall of the bag and is fixed thereto.

[0076] Figure 4Figure 5 shows a section of the bag front wall of an alternative embodiment according to the invention, specifically the upper end of the bag front wall with the first and second fold sections 21 and 23. A first weakening line 2 in the bag front wall 5 extends at a first mean distance A1 from the opening edge 16 of the bag front wall 5. A second weakening line 3 extends at a second mean distance A2 from the opening edge 16 of the bag front wall 5. The adhesive 11, however, is arranged in the first fold section 21 and therefore has a very small fourth mean distance A4 from the opening edge 16 of the bag front wall 5. When the bag front wall 5 is folded according to the invention, the adhesive 11 comes into contact with the bag back wall and is fixed thereto.

[0077] In the Figures 5 to 10The embodiments of the adhesive according to the present invention will be discussed. For the sake of clarity, only the aspect relating to the adhesive will be addressed. Each of the following embodiments is suitable for combination with the aforementioned bags, in which case the adhesive must be designed accordingly.

[0078] Figure 5 relates to a first embodiment, wherein the at least one adhesive agent, in particular in the form of an adhesive strip, has a first adhesion layer 131 on the front wall of the bag 105 as an adhesive layer, an intermediate layer, in particular a gap film, as a gap film 132 and a second adhesion layer 130 on the back wall of the bag 104 as an adhesive layer. Figure 5Figure 1 shows the bag in its closed state, i.e., the adhesive bonds the bag's front and back walls 105 and 104 by means of adhesive forces. The at least one split film 132 is designed and configured to split when the bag's front and back walls are separated. For this purpose, in the present embodiment, it is a multilayer coextruded plastic film.

[0079] Figure 6 shows once again the initial design of the Figure 5The bag was opened by separating the adhesive, causing it to disintegrate into two components. Since re-adhesion is impossible, the adhesive was destroyed in the process. The split film 132 was irreversibly split into at least one first component 135 of the split film 132 on the front wall 105 of the bag and at least one second component 134 of the split film 132 on the back wall 104 of the bag, with the first component being irreversibly delaminated from the second component, particularly parallel to the front wall of the bag. These components 134 and 135 prevent re-adhesion because they do not exhibit significant adhesive properties. The first component 135 is attached to the first adhesive layer 131, and the second component 134 is attached to the second adhesive layer 130.

[0080] Figure 7relates to a second embodiment, wherein the at least one adhesive has a first adhesion layer 231 as an adhesive layer, an intermediate layer as a gap film 232 and a second adhesion layer 230 as an adhesive layer. Figure 7 Figure 1 shows the bag in its closed state, i.e., the adhesive bonds the bag's front and back walls 205, 204 by means of adhesive forces. The at least one split film 232 is designed and configured to split when the bag's front and back walls 205, 204 are separated. For this purpose, in the present embodiment, it is a low-strength foam film.

[0081] Figure 8 shows once again the second design of the Figure 7The bag was then opened by separating the adhesive, causing it to disintegrate into two components. Since re-adhesion is not possible, it was destroyed in the process. The split film 232 was irreversibly split into at least one first component 235 of the split film 232 on the front wall 205 of the bag and at least one second component 234 of the split film 232 on the back wall 204 of the bag. The first component was irreversibly split by the second component parallel to the front wall 205 of the bag by fragmenting the low-strength foam. These components 234 and 235 prevent re-adhesion because they do not exhibit significant adhesive properties. The first component 235 is attached to the front wall 205 of the bag by the first adhesive layer 231, and the second component 234 is attached to the back wall 204 of the bag by the second adhesive layer 230.

[0082] Figure 9shows an initial position of the opened bag before it is closed, whereby this variant represents the first shaping of the Figure 5 is produced. The bag is in Figure 9 The bag is now open and has not yet been sealed by the adhesive. A protective film 140 is applied to the adhesive, which prevents the second adhesive layer (130) from forming adhesive forces to the opposite bag back wall 104. Furthermore, the structure of the gap film 132 and the adhesive effect of the first adhesive layer (131) to the bag front wall 105 are already in conjunction with Figure 5 as described. When the protective film 140 is removed and the bag's back wall 104 and front wall 105 are brought close together in the area of ​​the adhesive, adhesive forces act so that the bag adheres as described. Figure 5 shown, closed.

[0083] Figure 10shows a second starting position of the opened bag before it is closed, whereby this variant represents the first configuration of the Figure 5 is produced. The bag is in Figure 10 The bag is now open and has not yet been sealed by the adhesive. The adhesive consists of two parts: the second adhesive layer 152 is bonded to the back wall 104 of the bag and has a protective film 151 applied to it. This film prevents the second adhesive layer 152 from forming adhesive forces with the opposite gap film 132. The gap film is bonded to the front wall 105 of the bag by means of the first adhesive layer 131. When the protective film 151 is removed and the back wall 104 and front wall 105 of the bag are brought close together in the area of ​​the adhesive, adhesive forces act, causing the bag to seal as described in the diagram. Figure 5 shown, closed.

[0084] Figure 11shows a third starting position of the opened bag before it is closed, whereby this variant represents the first configuration of the Figure 5 is produced. The bag is in Figure 11The bag is now open and has not yet been sealed by the adhesive. The adhesive consists of two parts: a second adhesive layer 152 is bonded to the back wall 104 of the bag, and a second protective film 151 is applied to it. This film prevents the second adhesive layer 152 from forming adhesive forces with the opposite second adhesive layer 130. The second adhesive layer 130 is bonded to the gap film 132, and a first protective film 140 is applied to it. This first protective film prevents the second adhesive layer 130 from forming adhesive forces with the opposite second adhesive layer 152. The gap film is bonded to the front wall 105 of the bag by means of the first adhesive layer 131. When both protective films 151, 140 are removed and the bag's back wall 104 and front wall 105 are brought close together in the area of ​​the adhesive, adhesive forces act so that the bag, as in Figure 5As shown, the structure is closed. Here, two secondary adhesion layers 130, 152 come into contact, resulting in a particularly secure bond. It may be possible to implement a two-component adhesive.

[0085] The features of the invention disclosed in the foregoing description, in the claims and in the drawings may be essential for the realization of the invention in its various embodiments, both individually and in any combination.

Claims

1. A bag (1) with a substantially closed bottom end (15) and an opposite opening end (17), comprising a front bag wall (5, 105, 205) and a rear bag wall (4, 104, 204), which in the region of their mutually opposite first and second side edges (7, 7', 8, 8') and bottom edges (9, 9') are directly or indirectly connected to one another at least in sections, and with an opening edge (16) of the front bag wall (5, 105, 205) and an opening edge (16') of the rear bag wall (4, 104, 204) and with at least one first crease or first weakening line (2, 2') in the front bag wall (5, 105, 205), which extends at a first average distance (A1) from the opening edge (16) of the front bag wall (5, 105, 205) from or spaced apart from the first side edge (7, 7') up to or in the direction of the second side edge (8, 8'), wherein a region of the front bag wall (5, 105, 205) and a region of the rear bag wall (4, 104, 204) form a first fold section (21) from the opening edge (16, 16') of the front bag wall (5, 105, 205) up to the first crease or first weakening line (2, 2') of the front bag wall (5, 105, 205), and with at least one second crease or second weakening line (3, 3') in the front bag wall (5, 105, 205), which extends at a second average distance (A2) from the opening edge (16) of the front bag wall (5, 105, 205) from or spaced apart from the first side edge (7, 7') up to or in the direction of the second side edge (8, 8'), wherein the second average distance (A2) from the opening edge of the front bag wall (5, 105, 205) is greater than the first average distance (A1) from the opening edge of the front bag wall (5, 105, 205), wherein a region of the front bag wall (5, 105, 205) and a region of the rear bag wall form a second fold section (23) from the first crease or the first weakening line of the front bag wall (5, 105, 205) up to the second crease or second weakening line of the front bag wall (5, 105, 205), further comprising at least one adhesive (11), wherein the adhesive (11) is directly or indirectly attached with a first adhesive side to the front bag wall (5, 105, 205) or the rear bag wall (4, 104, 204) and extends in sections or completely from the first to the second side edge or at least in sections between the first and the second side edge of the front bag wall (5, 105, 205) or the rear bag wall (4, 104, 204), wherein the at least one adhesive (11) is designed and configured to connect the front bag wall and the rear bag wall (5, 4; 105, 104; 205, 204) to one another, characterized in that the at least one adhesive (11) is connected by way of adhesive forces to the front bag wall or the rear bag wall (4, 104, 204) and comprises a split film (132, 232), which is designed and configured to split during separation of the front bag wall and the rear bag wall (5, 4; 105, 104; 205, 204) in the region of the split film (132, 232) into at least one first component (135, 235) of the split film (132, 232) on the front bag wall (5, 105, 205) and into at least one second component of the split film (132, 232) on the rear bag wall (4, 104, 204), wherein the first component is irreversibly delaminated from the second component (134, 234), wherein the thickness of the adhesive (11) and / or of the split film (132, 232) is less than the thickness of the front bag wall (5, 105, 205) and the rear bag wall (4, 104, 204), wherein the split film (132, 232) has an average density of less than 0.85 g / cm3 entirely or in regions, and wherein the split film is a cavitated thermoplastic extruded plastic film or a multi-layered coextruded plastic film.

2. The bag according to claim 1, characterized in that the at least one first crease or first weakening line (2, 2') is present in the front bag wall (5, 105, 205) and the rear bag wall (4, 104, 204) and the at least one second crease or second weakening line (2, 2') is present in the front bag wall (5, 105, 205) and the rear bag wall (4, 104, 204).

3. The bag according to claim 1 or 2, characterized in that the first and second creases and / or the first and second weakening lines run substantially parallel to one another, wherein preferably the first and second creases, which are each substantially aligned in the same direction, and / or the first and second weakening lines have an average distance from one another in the range of 5 mm to 5 cm, in particular in the range of 1 cm to 3 cm.

4. The bag according to any one of the preceding claims, characterized in that the at least one adhesive (11) is an adhesive strip comprising the split film (132, 232), which is connected by way of adhesive forces to the front bag wall and the rear bag wall (5, 4; 105, 104; 205, 204), wherein the adhesive forces are greater than the forces required to tear the adhesive strip during separation of the front bag wall (5, 105, 205) from the rear bag wall (4, 104, 204) in the region of the adhesive strip and / or to separate, in particular delaminate, the plastic layers of the adhesive strip.

5. The bag according to any one of the preceding claims, characterized in that the at least one adhesive (11) has a first adhesive layer (131, 231), which comprises or forms the first adhesive side, a second adhesive layer (130, 230), which comprises or forms a second, in particular opposite, adhesive side of the adhesive (11), and preferably at least one intermediate layer arranged between the first and second adhesive layers, wherein the at least one intermediate layer is or comprises the split film (132, 232), which carries the first and second adhesive layers.

6. The bag according to any one of the preceding claims, characterized in that the at least one adhesive (11) and / or the first crease and / or second crease run substantially parallel to the opening-side edge of the front bag wall (5, 105, 205) and / or of the rear bag wall (4, 104, 204) of the bag (1).

7. The bag according to any one of the preceding claims, characterized in that the at least one adhesive (11) extends in sections between the first and second side edge (7, 7', 8, 8') and ends at an average side distance from the first and second side edge (7, 7', 8, 8'), in particular in each case corresponds to an average side distance of at least 10% of the total distance between the first and second side edge (7, 7', 8, 8').

8. The bag according to any one of the preceding claims, characterized in that the front bag wall (5, 105, 205), the rear bag wall (4, 104, 204), the bottom fold, the side walls and / or the side folds of the bag (1), in particular the front bag wall (5, 105, 205) and the rear bag wall (4, 104, 204) as well as optionally the bottom fold, the side folds and / or the side walls, are based completely or in sections on a paper material, in particular paper, wherein preferably the bag is formed from a one-piece paper material web.

9. The bag (1) according to any one of the preceding claims, characterized in that the thickness of the front bag wall (5, 105, 205) and / or of the rear bag wall (4, 104, 204) is in each case at least 50%, in particular at least 100% greater than the thickness of the adhesive (11) and / or of the split film (132, 232).

10. The bag according to any one of the preceding claims, characterized in that the split film (132, 232) has an average density of less than 0.80 g / cm3, preferably less than 0.75 g / cm3, in particular preferably less than 0.65 g / cm3, entirely or in regions.

11. The bag according to any one of the preceding claims, characterized in that the split film (132, 232) is a multi-layered coextruded plastic film, comprising polyethylene.

12. The bag according to any one of the preceding claims, characterized in that the split film (132, 232) has at least one weakening zone, preferably parallel to the front bag wall (5, 105, 205), in particular wherein the first and second components are separably connected by the weakening zone.

13. The bag according to any one of the preceding claims, characterized in that it is a block-bottom bag and / or side gusset bag, in particular a paper block-bottom bag.

14. Use of the bag (1) according to any one of the preceding claims for shipping food.

15. The use according to claim 14, wherein the bag has at least one adhesive, which is designed and configured to close the bag by way of adhesive forces, wherein during renewed opening with separation of the front bag wall and the rear bag wall (5, 4; 105, 104; 205, 204) in the region of a split film (132, 232) at least one first component (135, 235) of the adhesive strip remains on the front bag wall (5, 105, 205) and at least one second component (132, 232) remains on the rear bag wall (4, 104, 204), wherein the first component is irreversibly delaminated from the second component.