Packaging material web and packaging pouch

Abstract

The present invention relates to a packaging material web, which can be formed into a packaging pouch for wrapping a shipment item, comprising an outer layer, and inner layer and a cushion layer arranged between the outer layer and the inner layer, wherein at least one layer comprises paper, paperboard or cardboard, characterised in that the inner layer is provided with an adhesive coating, more particularly a cold-sealing adhesive coating, at least in some regions.

Description

[0001] Packaging material web and packaging bag

[0002] The present invention relates to a packaging material web and a packaging bag. Packaging material webs and packaging bags according to the invention are used in the packaging industry to package objects, especially shipping items, especially to protect them from damage during shipping. Generic materials for packaging material webs, packaging bags, and packaging material blanks consist of paper, such as recycled paper, and / or are processed into cardboard, especially corrugated cardboard, or carton.

[0003] WO 2005 / 080519 Ai discloses a packaging material web and a packaging bag made therefrom for packaging food. The packaging material web has longitudinal edge strips extending parallel to the longitudinal edges, which are provided with a cold-sealable adhesive. Furthermore, the packaging material web has transverse strips extending transversely to the web's longitudinal direction, which are provided with a cold-sealable adhesive. To form a packaging bag, the packaging material web is severed along the transverse adhesive strips and folded around the respective article. The edge strips are glued or sealed in the longitudinal and transverse directions using the adhesive edge strips, in order to completely enclose the article in a packaging bag by the packaging material web.

[0004] A disadvantage of the packaging material web or the packaging bag according to WO 2005 / 080519 Ai has been found to be that a relatively high amount of force is required to fold the packaging material web and wrap it around the article to form a closed packaging bag. Another disadvantage found to be that the packaging material web, and in particular the packaging bag, adapts only slightly to different article sizes.

[0005] A packaging material web that is easier to process, requires less effort, and can be more precisely adapted to different article sizes is known from the applicant's DE 102020 114211 Ai. The packaging material web consists, for example, of corrugated cardboard and is provided with a cold-sealable adhesive. Furthermore, several folding joints oriented in the longitudinal direction of the web are incorporated into the packaging material web, along which the packaging material web can be easily folded around the article to be packaged.

[0006] Packaging material webs designed in this way are generally very popular. However, it has been found that there is potential for optimization regarding cushioning properties, adhesive application, and pocket forming.

[0007] An object of the present invention is to overcome the disadvantages of the prior art, in particular to further develop a generic packaging material web such that the cushioning properties are improved and / or the application of adhesive and / or the pocket formation are facilitated.

[0008] The problem is solved by the subject matter of the independent claims.

[0009] According to this, a packaging material web is provided that can be formed to wrap a shipping item. The packaging material web according to the invention has a multi-layer structure. The various layers can be joined together using various fastening techniques, such as embossing or gluing. The individual layers can be made of paper, cardboard, or paperboard. According to DIN 6730, paper is characterized by a grammage in the range of 7 to 225 g / m². 2 , cardboard with a grammage of 226 g / m2 and cardboard according to general use a grammage between 150 and 600 g / m 2 has.

[0010] The layers of the packaging material web can be made of paper, such as recycled paper, in particular waste paper and / or 100% recyclable paper, which can be produced without chemical ingredients. Recycled paper is, in particular, paper materials with a low proportion (less than 50%) of paper material containing virgin fibers. For example, paper materials containing 70% to 100% waste paper are used. The recycled paper within the meaning of this invention can be paper material that can have a tensile strength index along the machine direction of at most 90 Nm / g, preferably a tensile strength of 15 Nm / g to 60 Nm / g, and a tensile strength index transverse to the machine direction of at most 60 Nm / g, preferably a tensile strength of 5 Nm / g to 40 Nm / g. A standard such as DIN EN ISO 1924-2 or DIN EN ISO 1924-3 can be used to determine the tensile strength or the tensile strength index.Additionally, or alternatively, a recycled paper or waste paper property can be characterized by its so-called burst resistance. A material in this sense is recycled paper with a burst index of 3.0 kPa*m or less. 2 / g, preferably with a bursting index of 0.8 kPa*m 2 / g to 2.5 kPa*m 2 / g. The standard DIN EN ISO 2758 is used to determine the bursting index. Furthermore, the packaging material has a mass per unit area of ​​40 g / m 2 up to max. 140 g / m 2 The source packaging material can be in the form of a roll of material or a zigzag-folded stack of packaging material, also known as a fanfold stack.

[0011] Within the scope of the present invention, a suitable paper grade is used for each layer of the packaging material web, depending on the packaging requirements. The packaging material web itself, i.e., its structure and number of layers, is thus adaptable to the paper grade used. Each layer can be single- or multi-layered.

[0012] Paper, cardboard, and / or carton can also be used to construct the packaging material web. Other plastic materials, such as a polyurethane foam or similar material that can be applied to a surface, can also be used. The packaging material web is universally and flexibly designed and can be adapted to the respective requirements and application. This also applies to the number and structure of each layer.

[0013] If a paper is used to design the packaging material web, this has a basis weight in the range of 30 g / m 2 up to 225 g / m 2 The paper can be flat and can also be used as a liner. Alternatively, it can also be three-dimensional, such as corrugated. Furthermore, the paper can be designed as a test liner. It is preferably designed as a kraft liner. The paper itself is designed as a sheet and can have one or more layers.

[0014] If cardboard is used to design the packaging material web, this has a mass per unit area of ​​more than 225 g / m 2Depending on the area-related mass, the cardboard can also be flat. Within the scope of the design freedom of the packaging material web, the cardboard can also be used as a liner. However, in comparison to the paper mentioned above, the cardboard itself is preferably three-dimensional or shaped and, for example, is corrugated. The cardboard itself is also designed as a layer or as an additional layer and can have one or more layers.

[0015] If a cardboard box is used to form the packaging material web, it is preferably multi-layered. In a first embodiment of a cardboard box, this is made of at least two layers of paper. Another embodiment of a cardboard box provides a number of layers of paper and / or cardboard, with the cardboard box having at least two layers in this embodiment. The area-related mass of a cardboard box can range from 150 g / m 2up to 600 g / m 2 be called.

[0016] In the context of the present invention, the following types of paper are used in particular:

[0017] Kraftliner is a liner paper made from unbleached (brown) or bleached (white, we don't have that) kraft pulp. The use of primary fibers (fresh fibers) results in good fiber-to-fiber bonding and thus good strength properties. Kraftliner papers have high tear resistance and are therefore suitable for packaging with high strength requirements.

[0018] Testliner is a two-ply recycled liner made from 100% waste paper. Depending on its strength, testliner is classified as TL1-TL3. Due to its fiber composition, the tear strength of this paper is lower than that of kraftliner. However, its stiffness properties are comparable to those of kraftliner. Since testliner papers must also meet specified quality criteria, only certain types of waste paper (e.g., corrugated board waste) are used in its production. Testliner is more cost-effective than kraftliner and, thanks to its recycled fibers, makes an important contribution to environmental protection. Testliner is particularly suitable for packaging with medium strength requirements as the inner and outer liner of corrugated board.

[0019] Sodium mixed papers are substitute kraft papers with low basis weights. These are now only made from high-quality recycled paper (kraft paper). N2 has lower strength values ​​than NM.

[0020] White lined kraftliner is a two-ply liner paper. It combines the good strength properties of a brown kraftliner with the good printability of a white kraftliner. Its two-ply construction results in good strength properties (a plywood effect). This paper is particularly suitable when, in addition to high printability requirements, high strength properties are also required.

[0021] To fill the interfiber spaces on a paper surface and cover the entire fiber layer, it may be necessary to apply a coating. This coating gives the paper a higher surface quality, making it suitable for use with high-quality prints. However, the applied ink film (especially in multi-color halftone prints) is relatively sensitive to mechanical stress and must therefore be sealed with an overprint varnish for optimal protection against abrasion.

[0022] This paper is particularly suitable when, in addition to the high strength requirements for the packaging, very high demands are also placed on the quality of the surface and the printing results.

[0023] White Testliner is a multi-layer liner paper made primarily from recycled fibers. The white top surface is primarily made from white recycled paper (e.g., printing paper, hygiene paper, etc.). The structure of coated white Testliner is identical to that of white Testliner. To improve the surface, a coating compound is applied, as with kraftliner.

[0024] Due to the recycled paper fibers used, the strength properties of these two papers are lower than those of white lined Kraftliner or white coated Kraftliner.

[0025] This paper has a brown kraftliner backing covered with a thin, cloudy bleached pulp layer. The brown kraftliner shines through the bleached pulp layer, creating a mottled (marbled) effect. Its strength and processing properties are roughly equivalent to those of brown kraftliner.

[0026] The same applies to this paper as to white flamed kraftliner, but here the paper layers are made from recycled paper.

[0027] While liner papers are usually high-density papers, which determine certain strength properties and the appearance of the corrugated papers, fluting papers have different requirements. Fluting papers have a lower density, are bulky, and must be easy to emboss. When fully embossed, they should possess high stiffness.

[0028] Fluted paper is a corrugated paper made primarily from primary (fresh) fibers. The term "semi-pulp" derives from the semi-chemical and semi-mechanical pulping of the fibers. A chemical process initially partially removes the undesirable components of the wood, such as resin or lignin, that are undesirable for paper production. This is followed by a mechanical post-treatment (fiberization).

[0029] When fully developed, semi-chemical papers exhibit high stiffness and are therefore particularly suitable as corrugated paper for packaging exposed to high stacking loads (stack crush resistance). Due to their high stiffness (brittleness), processing is more difficult than with corrugated paper. Corrugated paper is a type of corrugated paper made from recycled paper. Its strength and stiffness properties are between 20% and 30% lower than those of semi-chemical paper. The difference from our Schrenz lies in the sizing of the paper. A thin film of starch is applied to the paper in the machine.

[0030] Since corrugating media, like testliner papers, are predominantly made from recycled paper, their share, together with Schrenz and Schrenz Duplex papers, has now risen to over 70% of paper used in the corrugated board industry. With this high proportion of recycled paper, the German corrugated board industry has been making an important contribution to conserving our raw materials and protecting the environment for years.

[0031] The packaging material web extends in a web longitudinal direction and can have a constant web / material thickness and / or a constant width viewed transversely to the web longitudinal direction. In the width direction, the packaging material web ends at a longitudinal edge extending in the web longitudinal direction. For example, the packaging material web has a width of at least 200 mm and in particular of at most 2,000 mm. For example, the width is approximately 500 mm.

[0032] The packaging material web according to the invention comprises an outer layer, an inner layer, and a cushioning layer arranged between the outer layer and the inner layer. At least one layer comprises paper, cardboard, or carton.

[0033] The outer layer facing the environment can form an outer side of the packaging bag and can be made of paper, cardboard or carton, for example.

[0034] The inner layer facing the environment can form an inside of the packaging bag and comprise paper, cardboard or carton.

[0035] The cushioning layer lies between the outer layer and the inner layer when viewed in a direction transverse to the web plane. The cushioning layer can rest against the inner layer and the outer layer, in particular be attached to them, so that any relative movement of the individual layers to one another is prevented. The packaging material web is therefore constructed as a sandwich structure or in multiple layers. The cushioning layer is flexible and dampening, in particular transverse to the web direction and / or serves to absorb shocks or blows that can act on the packaging and the packaging material web, for example during logistics or the transport of goods, and in doing so protects the goods contained in the packaging from mechanical impact, in particular from external mechanical impact. This flexible and dampening cushioning layer can be constructed in various ways. The cushioning layer can, for example, be designed as a corrugated layer.It is essential that the damping or pole structure extends from the plane of the web, particularly perpendicular to the packaging material web, and thus has a significant three-dimensional extension. For example, the corrugated structure has a plurality of beads or cups, which are particularly regularly spaced from one another and extend along the plane in the longitudinal and / or transverse direction of the packaging material web. This spatial structure is also produced from an originally flat paper or cardboard by forming or primary shaping.

[0036] Each of the aforementioned spatial structures is designed as a layer due to its flexibility and damping capacity to absorb shocks or impacts, and is preferably made of paper or cardboard. In a further development and using a different material, the flexible and damping structure is provided as a foam, such as polyurethane foam, with the foam itself forming the spatial structure.

[0037] If the packaging material web is single-layered, it can be made of paper or cardboard with a mass per unit area of ​​more than 200 g / m 2This single-layer packaging material web itself has both an outer and an inner surface. Furthermore, this packaging material web is designed to be inherently flexible or dampening. While the flexibility or dampening capacity is very low, it has been found that this flexibility or dampening capacity is sufficient for particularly simple packaging requirements.

[0038] Special features of the outer layer should also be mentioned. This can be multi-layered, with the outer side of the outer layer, which forms the outside of the packaging, being provided at least in sections with a coating which ensures particularly good adhesion for stickers or labels for shipping. Furthermore, the coating can be designed to better accept prints. Alternatively, the outer side of the outer layer itself is designed as a high-energy, polar, or olefinic surface and is configured to receive and firmly fix prints and / or stickers. Alternatively, the outer layer or an outer layer assigned to the outer layer is designed as a printable and / or printable layer.

[0039] Special features of the inner side should also be mentioned. This is arranged on the side opposite the outer side of the packaging material web and has the adhesive on its surface. Depending on the surface quality or the choice of material used, the inner side can be provided with an adhesive carrier before the adhesive itself is applied. The packaging bag according to the invention, which can be produced from the packaging material web, comprises an outer layer made of paper, cardboard, or paperboard, forming the outer side of the packaging bag.

[0040] Furthermore, the arrangement of the flexible or damping layer should be mentioned, if it is wave-shaped or designed in the manner of a sine wave. The wave shape itself extends transversely to the longitudinal direction of the packaging material web and is thus aligned parallel to the central longitudinal axis of a roll when the packaging material web is rolled up as such a roll-forming roll web and is prepared for the production of the shipping bags.

[0041] According to a first aspect of the present invention, the inner layer, in particular of packaging bags, is coated at least partially with a cold-sealable adhesive on its inside, i.e., on its surface facing away from the outer layer and facing the interior of the packaging bag. In other words, the inner layer is provided with a cold-sealable adhesive coating. The inner layer can be coated with the adhesive over its entire surface or in sections. For example, it is possible for at least one longitudinal edge strip of the packaging material web adjacent to a longitudinal edge to be provided at least partially with a cold-sealable adhesive.

[0042] In an advantageous embodiment, the adhesive is applied over the entire surface of the inner layer. Since the packaging material web is designed as a continuous packaging material web, packaging bags of various lengths can be produced from it by designing the continuous packaging material web so that it can be cut to length. The length of the packaging bag extends in the longitudinal direction of the packaging material web, and if the packaging material web is coated with adhesive over its entire surface on the inner layer, adhesive is always present both inside the packaging bag and on the joining surfaces to be bonded. The adhesive itself has anti-slip properties, so that the goods are practically secured within the packaging bag thanks to a high friction fit and do not slip during transport.If multiple items are contained within the packaging bag, the adhesive is applied to the entire inner layer to practically secure them together, preventing them from bumping into each other during transport. This advantageously eliminates the need for additional padding or filling within the packaging bag.

[0043] The cold-sealable adhesive is capable of creating a permanent bond between packaging material web surfaces. The cold-sealable adhesive, in particular the bond between two surfaces achieved by means of the cold-sealable adhesive, can be characterized in that the bond cannot be separated without destruction. Furthermore, the cold-sealable adhesive can be characterized in that the longitudinal edge strips provided and bonded with cold-sealable adhesive cannot be peeled off or removed from one another without damaging or destroying the packaging material to be bonded, in particular paper or cardboard, in particular corrugated cardboard. According to one embodiment, the adhesive is a natural rubber latex-based adhesive, i.e. an adhesive that contains natural rubber latex.The cold-sealable adhesive can, for example, comprise latex and a styrene-acrylate copolymer, and optionally a proportion of 0.4% to 0.6% of a defoamer. The adhesive solids content can, for example, be 50% ± 10%, with the remainder being water. The cold-sealable adhesive can, for example, be applied to the at least one longitudinal edge strip by means of rollers, i.e., by roller application, which can be made of rubber, brass, or copper, for example, by spraying, or by spraying. For example, the cold-sealable adhesive is an aqueous dispersion based on natural latex. For example, commercially available cold-sealable adhesives can be used.

[0044] According to a preferred embodiment, the adhesive, in particular the cold-sealable adhesive, comprises natural rubber latex, a styrene-acrylate copolymer, and preferably a defoamer. It has been found that an adhesive comprising natural rubber latex, a styrene-acrylate copolymer, and optionally a defoamer achieves excellent adhesive effects and is particularly advantageous for the packaging material webs and packaging bags according to the invention. By adding styrene-acrylate copolymer to the adhesive, the adhesion of the adhesive is significantly improved compared to a natural rubber latex-based adhesive without styrene-acrylate copolymer. Compared to natural rubber latex-based adhesives that contain other polymers instead of a styrene-acrylate copolymer, a natural rubber latex-based adhesive with a styrene-acrylate copolymer has the advantage of extremely high resistance.An adhesive comprising natural rubber latex and a styrene-acrylate copolymer therefore has particularly advantageous properties with regard to application to packaging material webs or packaging bags.

[0045] The adhesive, especially a cold-sealable adhesive, can be in the form of an aqueous dispersion according to one embodiment. An adhesive in the form of an aqueous dispersion is particularly suitable for application to packaging material webs.

[0046] The adhesive, in particular a cold-sealable adhesive, for example a cold-sealable adhesive in the form of a dispersion, preferably has a pH of at least pH 8, more preferably at least pH 9. A pH of the adhesive of at least pH 8, preferably pH 9, can prevent components of the natural rubber latex from precipitating. The pH of the adhesive can optionally be adjusted to the desired pH, preferably at least pH 8, more preferably at least pH 9, by adding a base, for example ammonia. According to one embodiment, the adhesive contains a base, for example ammonia, and preferably has a pH of at least pH 8, preferably pH 9.

[0047] According to one embodiment, the adhesive comprises natural rubber latex, a styrene-acrylate copolymer, and preferably a defoamer, as well as at least one further component selected from a wetting agent, a stabilizing agent, a base, an antiblocking agent, a UV tracer, an ethylene-vinyl acetate copolymer, and a polyvinyl acetate. The adhesive may contain one or more of the further components. For example, the adhesive may comprise any combination of a wetting agent, a stabilizing agent, a base, an antiblocking agent, a UV tracer, an ethylene-vinyl acetate copolymer, and a polyvinyl acetate, for example a wetting agent, a base, and a UV tracer.

[0048] According to one embodiment, the adhesive comprises a defoamer and optionally another component selected from a wetting agent, a stabilizing agent, a base, an antiblocking agent, a UV tracer, an ethylene-vinyl acetate copolymer, and a polyvinyl acetate. A defoamer can, for example, comprise a silicon-based compound such as emulsified silicone or silica, a wax, a mineral oil, a hydrocarbon, a polyether, fatty acid-based compounds such as stearate, acylglycerols, glycol esters, and / or a polyol. The application of the adhesive can be facilitated by means of a defoamer, as foaming of the adhesive during application is prevented. It has been found that foaming of the adhesive can be effectively prevented by a defoamer in an amount ranging from 0.2 wt.% to 0.8 wt.%, preferably in a range from 0.4 wt.% to 0.6 wt.%.According to a preferred embodiment, the cold-sealable adhesive contains a defoamer in an amount ranging from 0.2 wt.% to 0.8 wt.%, preferably in a range from 0.4 wt.% to 0.6 wt.%. According to one embodiment, the adhesive, in a dried or undried state, preferably the adhesive in a undried state, comprises defoamer in an amount ranging from 0.2 wt.% to 0.8 wt.%, preferably in a range from 0.4 wt.% to 0.6 wt.%.

[0049] According to one embodiment, the adhesive comprises a wetting agent. A wetting agent reduces the interfacial tension between two phases and can support the formation of dispersions. A wetting agent can comprise a non-ionic wetting agent, an anionic wetting agent, a cationic wetting agent and / or an amphoteric wetting agent, preferably a non-ionic wetting agent and / or an anionic wetting agent. A wetting agent can comprise, for example, fatty acid esters, fatty alcohol ether sulfates, fatty alcohol polyglycol ethers, fatty alcohol sulfates, alkyl sulfosuccinates, alkyl sulfosuccinamates, alkylbenzene sulfates, fatty alcohol ether phosphates and / or alkyl aryl ether sulfates. It has been found that an adhesive with a wetting agent can be distributed particularly evenly on the packaging material web. According to one embodiment, the adhesive comprises a wetting agent in an amount ranging from 0.01% by weight to 3% by weight.% on.

[0050] According to one embodiment, the adhesive comprises a stabilizer. A stabilizer is an optional adhesive component that serves to improve the stability of the adhesive and / or the adhesive layer, particularly with respect to storage, processing, and stress influences. Stabilizers can include any agent that improves the stability of the adhesive, for example, polysaccharides, cellulose derivatives, resins, polymers such as polyvinyl alcohol, aluminum oxide, carbon black, and / or kaolin. According to one embodiment, the adhesive comprises a stabilizer in an amount ranging from 0.01 wt.% to 5 wt.%.

[0051] The cold-sealable adhesive may contain a base, such as ammonia. A base can be used to adjust the pH of the adhesive, for example, to a pH of at least 8, preferably at least 9.

[0052] According to one embodiment, the adhesive may contain an antiblocking agent, which may include, for example, an amide wax, such as erucic acid or oleic acid amide, talc, and / or chalk. An antiblocking agent promotes easier handling, for example, when opening a packaging bag. According to one embodiment, the adhesive comprises an antiblocking agent in an amount ranging from 0.01 wt.% to 5 wt.%.

[0053] According to one embodiment, the adhesive can contain a UV tracer. A UV tracer can be made visible under UV irradiation and can be used, for example, to detect coated surfaces, for quality control, and / or for (cut) position detection during the production of the packaging material web or the packaging pocket. UV-fluorescent additives, for example, can be used as UV tracers. According to one embodiment, the adhesive comprises a UV tracer in an amount ranging from 0.01 wt.% to 1 wt.%.

[0054] According to a preferred embodiment, the packaging material web is provided with a coating, for example with a coating of the inner layer on the inside of the packaging bag, wherein the coating contains the adhesive in an amount in a range of 2 g / m 2 up to 20 g / m 2 , preferably io g / m 2 up to 12 g / m 2According to one embodiment, the coating comprises the adhesive in an amount in a range of 2 g / m 2 up to 20 g / m 2 , preferably 10 g / m 2 up to 12 g / m 2, wherein the adhesive is in a dried state or in a non-dried state, preferably in a dried state. An adhesive in a dried state is a dried adhesive that can be obtained by drying, for example by oven drying, the adhesive, in particular the adhesive applied to the packaging material web. According to one embodiment, the adhesive in the dried state is in the form of solid particles. An adhesive in a non-dried state is a non-dried adhesive that has a water content in a range of 30 wt.% to 70 wt.% and is preferably present as a dispersion. A coated surface of the packaging material web, for example a surface of the inner layer coated on the inside of the packaging bag, can, according to the invention, have an adhesive quantity in a range of 2 g / m 2 up to 20 g / m 2 , preferably 10 g / m 2 up to 12 g / m 2, based on the coated surface. According to one embodiment, the adhesive quantity is in a range of 2 g / m 2 up to 20 g / m 2 , preferably 10 g / m 2 up to 12 g / m 2 to a dried state of the adhesive, i.e., to the solid particles of the adhesive. The adhesive is preferably applied evenly over the coated surface to increase the adhesive strength of the bonded joints.

[0055] According to one embodiment, the adhesive can have a water content in a range of <10 wt.% or 30 wt.% to 70 wt.%, preferably in a range of <10 wt.% or 40 wt.% to 60 wt.%. It has been found that an adhesive with a water content of 30 wt.% to 70 wt.%, in particular 40 wt.% to 60 wt.%, can be applied particularly well to packaging material webs. After the adhesive has been applied to the packaging material web, the adhesive can optionally be dried, whereby a water content of <10 wt.% is obtained. An adhesive with a water content of <10 wt.% has a particularly high storage stability. An adhesive applied to the packaging material web in a dried state has a water content of <10 wt.%, preferably <5 wt.%. An adhesive applied to the packaging material web in a non-dried state has a water content of 30 wt.% to 70 wt.%, preferably 40 wt.% to 60 wt.%. A packaging material web with dried and / or undried adhesive exhibits excellent adhesive properties and is suitable for forming into a packaging bag.

[0056] The adhesive, which is a natural rubber latex-based adhesive, is preferably applied in such a way that there is no contact between an applied printing ink film and the adhesive in the finished product, in order to prevent premature aging of the adhesive due to a reaction of the natural rubber latex with components of the printing ink film. With the packaging material web according to the invention, an article, such as a packaging and / or shipping article, can be easily wrapped or encased using the packaging material web. This is achieved by folding the packaging material web and moving the folding sections towards one another and, if necessary, placing them on top of one another, so that a permanent connection, in particular a seal, of the two facing folding section surfaces can be established solely through the mutual contact of the folding section surfaces provided with adhesive.The cold-sealable adhesive can further be configured such that activation of the adhesive / sealing effect is necessary for the adhesive to exert its adhesive / sealing effect. Activation can be achieved, for example, by external pressure application, which causes the cold-sealable adhesive to exert its adhesive / sealing effect by firmly pressing the folded sections moving toward one another under the influence of the applied pressure. Thus, the packaging and / or shipping item can be easily wrapped using the packaging material web. For example, it is not necessary to apply additional heat and / or additional adhesive materials. The packaging material web according to the invention allows productivity in the packaging of articles, such as packaging and / or shipping items, to be significantly increased.Furthermore, packaging material can be saved because there is no need to wrap the object to be protected multiple times. Furthermore, a length of the packaging material web, measured in the longitudinal direction of the web, can be flexibly adapted and adjusted to the article to be packaged. Precisely because the packaging material web is designed as a continuous roll and if the inside is fully coated with adhesive, this decisive inventive advantage can be used to produce longer or shorter shipping bags. The length of the shipping bag depends on the length or size of the goods to be packaged. Once the length of the packaging bag is defined, it can be created by simply cutting the packaging material web, which is designed as a roll, to length.This means that shorter packaging bags can be produced that correspond to a low price level of a shipping service provider, but equally long shipping bags can be produced without gradations that meet the requirements of a freight forwarding service provider. Such typical lengths are adapted to Euro pallets, for example, but are generally adapted to the goods to be packaged, if, for example, bar goods with lengths of 1, 2, 3, 5 or 6 meters are packaged. Another advantage of the multi-layer construction according to the invention is that the packaging material web provides good cushioning and thus protection for the article to be packaged. A further advantage of the present invention is that the adhesive can be applied more easily to the flat inner layer than with a corrugated layer, and the adhesion of the adhesive to the flat inner layer is also improved.As an alternative to or in addition to the cold-sealable adhesive, other joining techniques are conceivable. Examples include heat sealing and the application of adhesives on-site, i.e., sealing in-line. Furthermore, it is conceivable to use form-fit and / or friction-lock joining technologies, such as embossing, perforation, or similar, to create an interlocking and secure fastening structure in the packaging material web. Furthermore, it is conceivable to use fastening aids as alternatives or in addition, such as sewing with threads, ultrasound, welding with PE coating, adhesive tapes, or similar.

[0057] According to an exemplary embodiment of the packaging material web according to the invention, the adhesive coating is arranged on a surface of the inner layer facing away from the outer layer. The adhesive coating thus faces the later interior of the packaging bag or the shipping article. According to an exemplary development of the present invention, the cushioning layer has a particularly sinusoidal corrugation layer. For example, the cushioning layer is designed as a corrugated layer. A corrugation of the corrugation layer can be oriented transversely, in particular perpendicularly, to the longitudinal direction of the packaging material web. Furthermore, it is possible for the cushioning layer to comprise paper, cardboard, or foam, such as PUR, in particular with a density of less than 90 kg / m3.

[0058] According to a further exemplary development of the present invention, the cushioning layer comprises flake-like filling material and / or a foam, such as a PUR (polyurethane foam) or the like.

[0059] According to an exemplary embodiment of the packaging material web according to the invention, the material of the outer layer has a grammage in the range of 20 g / m 2 up to 40 g / m 2 In particular, the outer layer is a kraftliner paper with a grammage in the range of 50 g / m 2 up to 420 g / m 2 , preferably in the range of 100 g / m 2 up to 130 g / m 2 . Furthermore, the outer layer can be a testliner paper, in particular with a grammage in the range of 50 g / m 2 130 g / m 2 , preferably in the range of 100 g / m 2 up to 150 g / m 2According to a further exemplary embodiment, the outer layer is a soda mixed paper, in particular with a grammage in the range of 20 g / m2 to 120 g / m2, preferably in the range of 40 g / m 2 up to 70 g / m 2 . Furthermore, the outer layer can also be paper material with a grammage in the range of 40 g / m 2 up to 120 g / m 2 , preferably in the range of 60 g / m 2 up to 70 g / m 2 According to an exemplary embodiment, the outer cover layer consists of a material with a grammage in the range of 120 g / m 2 up to 130 g / m 2 , preferably 125 g / m 2 . Important for the material of the outer layer is significant durability and / or tear resistance. According to a further exemplary embodiment of the present invention, the material of the inner layer has a grammage in the range of 20 g / m 2 up to 150 g / m 2In particular, the inner layer is a paper with a grammage in the range of 50 g / m 2 up to 150 g / m 2 , preferably in the range of 80 g / m 2 up to 120 g / m 2 . Furthermore, it is possible that the inner layer is a paper material with a grammage in the range of 40 g / m 2 up to 120 g / m 2 , preferably in the range of 60 g / m 2 up to 70 g / m 2 According to an exemplary further development, the inner layer is a soda mixed paper, in particular with a grammage in the range of 20 g / m 2 up to 120 g / m 2 , preferably in the range of 40 g / m 2 up to 70 g / m 2 .

[0060] According to an exemplary development of the packaging material web according to the invention, the material of the corrugated layer has a grammage in the range of 7 g / m 2 up to 150 g / m 2 In particular, the flute layer is a paper with a grammage in the range of 20 g / m 2 up to 120 g / m2 , preferably in the range of 50 g / m 2 up to 120 g / m 2 , preferably in the range of 80 g / m 2 up to 120 g / m 2 .

[0061] According to a further exemplary embodiment of the present invention, the cushioning layer is designed as a sinusoidal wave layer, in particular as an E-wave. For example, a wave height (amplitude) transverse to the longitudinal extent of the packaging material web is in the range from 0.5 mm to 5 mm, in particular in the range from 0.75 mm to 3 mm or in the range from 1.0 mm to 1.9 mm, and / or a wave pitch (wave length) transverse to the longitudinal extension direction and width direction of the packaging material web is in the range from 1.0 mm to 10 mm, in particular in the range from 1.5 mm to 7.5 mm, in particular in the range from 2.0 mm to 5 mm or in the range from 2.6 mm to 3.5 mm.

[0062] In a further exemplary embodiment of the present invention, the cushioning layer is recycled paper, in particular with a maximum of 50% or maximum of 70% virgin fiber content. For example, the cushioning layer consists exclusively of recycled paper.

[0063] This E-flute is particularly advantageous for packaging purposes, for example, for labeling the packaging bag or printing it with stickers or advertising. The E-flute allows for particularly space-saving storage of the packaging material wound into a roll, as it has been found that the roll diameter can be kept small while maintaining the highest possible number of running meters on the roll.

[0064] In an exemplary development of the packaging material web according to the invention, a sequence of an intermediate layer made of paper, cardboard, or carton and a further cushioning layer made of paper, cardboard, or carton, particularly shaped in accordance with the cushioning layer and in particular sinusoidally wave-shaped, is arranged between the inner layer and the cushioning layer to form a sandwich structure such that the intermediate layer rests against the cushioning layer associated with the outer layer, and the further cushioning layer rests against the intermediate layer and the inner layer. According to this construction principle, a desired stability and / or deformability can be created as desired, for example depending on the shipping item to be packaged, and in particular depending on the desired buffer properties.

[0065] According to a further exemplary development, the cushioning layer assigned to the outer layer differs from the cushioning layer assigned to the inner layer, in particular with regard to the type of corrugation, the corrugation height, and / or the corrugation pitch. As a result, for example, the cushioning layer facing the interior of the packaging bag can be designed such that the focus is on high damping or buffering capacity, while the focus for the cushioning layer assigned to the outer layer can be on stability. As a rule, the buffering capacity is increased by increasing the corrugation height of the cushioning layer and / or the corrugation pitch. Stability is increased by reducing the corrugation height and / or the corrugation pitch of the cushioning layer.

[0066] According to a further aspect of the present invention, which can be combined with the preceding aspects and exemplary embodiments, a packaging material web is provided which can be formed into a packaging bag for enveloping a shipping article, made of paper, cardboard or carton and with a coating of, in particular, cold-sealable adhesive.

[0067] According to a further aspect of the invention, the adhesive, in particular the cold-sealable adhesive, comprises natural rubber latex, a styrene-acrylate copolymer, and preferably a defoamer. It has been found that an adhesive comprising natural rubber latex, a styrene-acrylate copolymer, and optionally a defoamer achieves excellent adhesive effects and is particularly advantageous for the packaging material webs and packaging bags according to the invention. By adding styrene-acrylate copolymer to the adhesive, the adhesion of the adhesive is significantly improved compared to a natural rubber latex-based adhesive without styrene-acrylate copolymer. Compared to natural rubber latex-based adhesives that comprise other polymers instead of a styrene-acrylate copolymer, a natural rubber latex-based adhesive with a styrene-acrylate copolymer has the advantage of being extremely durable.An adhesive comprising natural rubber latex and a styrene-acrylate copolymer therefore has particularly advantageous properties when applied to packaging material webs or packaging bags. According to one embodiment, the adhesive, in particular a cold-sealable adhesive, can be in the form of an aqueous dispersion. An adhesive in the form of an aqueous dispersion is particularly well suited for application to packaging material webs.

[0068] The adhesive, in particular a cold-sealable adhesive, for example a cold-sealable adhesive in the form of a dispersion, preferably has a pH of at least pH 8, more preferably at least pH 9. A pH of the adhesive of at least pH 8, preferably pH 9, can prevent components of the natural rubber latex from precipitating. The pH of the adhesive can optionally be adjusted to the desired pH, preferably at least pH 8, more preferably at least pH 9, by adding a base, for example ammonia. According to one embodiment, the adhesive contains a base, for example ammonia, and preferably has a pH of at least pH 8, preferably pH 9.

[0069] According to one embodiment, the adhesive comprises natural rubber latex, a styrene-acrylate copolymer, and preferably a defoamer, as well as at least one further component selected from a wetting agent, a stabilizing agent, a base, an antiblocking agent, a UV tracer, an ethylene-vinyl acetate copolymer, and a polyvinyl acetate. The adhesive may contain one or more of the further components. For example, the adhesive may comprise any combination of a wetting agent, a stabilizing agent, a base, an antiblocking agent, a UV tracer, an ethylene-vinyl acetate copolymer, and a polyvinyl acetate, for example a wetting agent, a base, and a UV tracer.

[0070] According to one embodiment, the adhesive comprises a defoamer and optionally another component selected from a wetting agent, a stabilizing agent, a base, an antiblocking agent, a UV tracer, an ethylene-vinyl acetate copolymer, and a polyvinyl acetate. A defoamer can, for example, comprise a silicon-based compound such as emulsified silicone or silica, a wax, a mineral oil, a hydrocarbon, a polyether, fatty acid-based compounds such as stearate, acylglycerols, glycol esters, and / or a polyol. The application of the adhesive can be facilitated by means of a defoamer, as foaming of the adhesive during application is prevented. It has been found that foaming of the adhesive can be effectively prevented by a defoamer in an amount ranging from 0.2 wt.% to 0.8 wt.%, preferably in a range from 0.4 wt.% to 0.6 wt.%.According to a preferred embodiment, the cold-sealable adhesive contains a defoamer in an amount ranging from 0.2 wt.% to 0.8 wt.%, preferably in a range from 0.4 wt.% to 0.6 wt.%. According to one embodiment, the adhesive in a dried or undried state, preferably the adhesive in a undried state, comprises defoamer in an amount ranging from 0.2 wt.% to 0.8 wt.%, preferably in a range from 0.4 wt.% to 0.6 wt.%.

[0071] According to one embodiment, the adhesive comprises a wetting agent. A wetting agent reduces the interfacial tension between two phases and can support the formation of dispersions. A wetting agent can comprise a non-ionic wetting agent, an anionic wetting agent, a cationic wetting agent and / or an amphoteric wetting agent, preferably a non-ionic wetting agent and / or an anionic wetting agent. A wetting agent can comprise, for example, fatty acid esters, fatty alcohol ether sulfates, fatty alcohol polyglycol ethers, fatty alcohol sulfates, alkyl sulfosuccinates, alkyl sulfosuccinamates, alkylbenzene sulfates, fatty alcohol ether phosphates and / or alkyl aryl ether sulfates. It has been found that an adhesive with a wetting agent can be distributed particularly evenly on the packaging material web. According to one embodiment, the adhesive comprises a wetting agent in an amount ranging from 0.01% by weight to 3% by weight.% on.

[0072] According to one embodiment, the adhesive comprises a stabilizer. A stabilizer is an optional adhesive component that serves to improve the stability of the adhesive and / or the adhesive layer, particularly with respect to storage, processing, and stress influences. Stabilizers can include any agent that improves the stability of the adhesive, for example, polysaccharides, cellulose derivatives, resins, polymers such as polyvinyl alcohol, aluminum oxide, carbon black, and / or kaolin. According to one embodiment, the adhesive comprises a stabilizer in an amount ranging from 0.01 wt.% to 5 wt.%.

[0073] The cold-sealable adhesive may contain a base, such as ammonia. A base can be used to adjust the pH of the adhesive, for example, to a pH of at least 8, preferably at least 9.

[0074] According to one embodiment, the adhesive may contain an antiblocking agent, which may include, for example, an amide wax, such as erucic acid or oleic acid amide, talc, and / or chalk. An antiblocking agent promotes easier handling, for example, when opening a packaging bag. According to one embodiment, the adhesive comprises an antiblocking agent in an amount ranging from 0.01 wt.% to 5 wt.%.

[0075] According to one embodiment, the adhesive can contain a UV tracer. A UV tracer can be made visible under UV irradiation and can be used, for example, to detect coated surfaces, for quality control, and / or for (cut) position detection during the production of the packaging material web or the packaging pocket. UV-fluorescent additives, for example, can be used as UV tracers. According to one embodiment, the adhesive comprises a UV tracer in an amount ranging from 0.01 wt.% to 1 wt.%.

[0076] According to a preferred embodiment, the packaging material web is provided with a coating, for example with a coating of the inner layer on the inside of the packaging bag, wherein the coating contains the adhesive in an amount in a range of 2 g / m 2 up to 20 g / m 2 , preferably io g / m 2 up to 12 g / m 2According to one embodiment, the coating comprises the adhesive in an amount in a range of 2 g / m 2 up to 20 g / m 2 , preferably 10 g / m 2 up to 12 g / m 2, wherein the adhesive is in a dried state or in a non-dried state, preferably in a dried state. An adhesive in a dried state is a dried adhesive that can be obtained by drying, for example by oven drying, the adhesive, in particular the adhesive applied to the packaging material web. According to one embodiment, the adhesive in the dried state is in the form of solid particles. An adhesive in a non-dried state is a non-dried adhesive that has a water content in a range of 30 wt.% to 70 wt.% and is preferably present as a dispersion. A coated surface of the packaging material web, for example a surface of the inner layer coated on the inside of the packaging bag, can, according to the invention, have an adhesive quantity in a range of 2 g / m 2 up to 20 g / m 2 , preferably 10 g / m 2 up to 12 g / m 2, based on the coated surface. According to one embodiment, the adhesive quantity is in a range of 2 g / m 2 up to 20 g / m 2 , preferably 10 g / m 2 up to 12 g / m 2to a dried state of the adhesive, i.e. to the solid particles of the adhesive. The adhesive is preferably applied evenly over the coated surface in order to increase the adhesive strength of the adhesive bonds. According to one embodiment, the adhesive can have a water content in a range of <10 wt.% or 30 wt.% to 70 wt.%, preferably in a range of <10 wt.% or 40 wt.% to 60 wt.% It has been found that an adhesive with a water content of 30 wt.% to 70 wt.%, in particular 40 wt.% to 60 wt.%, can be applied particularly well to packaging material webs. After the adhesive has been applied to the packaging material web, the adhesive can optionally be dried, whereby a water content of <10 wt.% is obtained. An adhesive with a water content of <10 wt.% has a particularly high storage stability.An adhesive applied to the packaging material web in a dried state has a water content of <10 wt.%, preferably <5 wt.%. An adhesive applied to the packaging material web in a non-dried state has a water content of 30 wt.% to 70 wt.%, preferably 40 wt.% to 60 wt.%. A packaging material web with dried and / or non-dried adhesive has excellent adhesive properties and is suitable for forming into a packaging bag.

[0077] According to an exemplary development of the packaging material web according to the invention, the packaging material web has a plurality of transverse strips oriented transversely, in particular perpendicularly, to the longitudinal direction of the web and / or arranged at an equidistant distance from one another, which are provided with a cold-sealable adhesive. The cold-sealable adhesive can be applied in a similar way to the longitudinal edge strip. Due to the transverse strips evenly distributed in the longitudinal direction of the web, the packaging material web can be closed and / or glued both at the longitudinal edge strip and at the transverse strips to form a closed sleeve, in particular a packaging pocket. For example, the distance between the transverse strips can be dimensioned according to a standard for shipping packages, e.g., a DHL parcel.

[0078] In a further exemplary embodiment of the packaging material web according to the invention, the transverse strips each lead into at least one, preferably both, longitudinal edge strips. For example, the packaging material web can have a repeating pattern, repeat, or grid of the longitudinal edge and transverse strips provided with cold-sealable adhesive, wherein the pattern has rectangular, in particular square, adhesive windows that form the pattern or grid. Thus, it can be provided that the packaging material web between the longitudinal edge and transverse strips is essentially free of the cold-sealable adhesive, in particular over its entire surface. The pattern or repeat can either be uniform or vary in the longitudinal direction of the web, wherein the patterns or repeats can be dimensioned such that they are also suitable for articles of a predetermined size and / or are tailored to standardized sizes, for example of a DHL parcel.

[0079] In a further exemplary embodiment of the present invention, the transverse strips, in particular in the region of at least one longitudinal edge strip, in particular on the corresponding longitudinal edge, are provided with an indicator for displaying the respective cross-section. The indicator simplifies the production of a packaging material blank from which, for example, a packaging bag and / or a packaging pocket can be made. The indicator can be, for example, a material weakening, in particular a perforation or an external notch, or a color marking. The indicator can be configured to be detectable, so that automated production and packaging is possible or simplified. The indicator enables a precisely fitting and length-specific packaging process for articles that may have different sizes. According to one embodiment, the indicator can be a UV tracer contained in the adhesive.According to a further aspect of the present invention, which can be combined with the preceding aspects and exemplary embodiments, a packaging bag for enveloping a shipping article is provided, which is formed by forming, such as folding, a packaging material web designed according to one of the preceding claims and optionally cutting to length, such as cutting a blank of suitable dimensions from the packaging material web.

[0080] In an exemplary embodiment of the packaging bag according to the invention, it has dimensions in the range of 30 mm to any desired size, in particular up to 350 mm (length in the longitudinal direction of the web) x 50 mm to 1000 mm (width transverse to the longitudinal direction of the web) x 1 mm to 200 mm (depth transverse to the longitudinal direction of the web and to the width direction). For example, the packaging bag has the size of a postal maxi-letter, namely approximately 353 mm x 250 x 50 cm.

[0081] According to a further exemplary embodiment, at least one edge forming an edge of the packaging pocket, in particular two superimposed edges, is formed by cutting, in particular cutting, the packaging material web, in particular by means of a rotary or guillotine cutting knife.

[0082] In an exemplary development, the trimmed edge, in particular the cut edge, is slightly frayed and / or blunt to such an extent that the packaging bag can be manually manipulated along the trimmed edge without injury. In particular, the shape of the trimmed edge results from the shape of the cutting device used, in particular its cutting bar or knife. The trimmed edge can be wavy, jagged, frayed, etc. In particular, the cut edge is slightly serrated, similar to the toothed bar, and in particular the protruding tooth tips of the cardboard are slightly frayed. This means that the cut edge or the edge of the cardboard is not sharp / razor-sharp, but rather a blunt, slightly frayed cut edge remains, so that a user does not cut themselves.According to a further exemplary development of the packaging bag according to the invention, the adhesive coating is designed and in particular applied over the entire surface of the inner layer in such a way that a movement of an article arranged in the packaging bag relative to the inner layer is impaired.

[0083] In a further exemplary embodiment of a packaging material web according to the invention or a packaging bag according to the invention, the packaging material web has a marking or weakening indicating an opening and / or tear-open aid. For example, the cut-to-length edge has a marking or weakening that is clearly visible to the user or the shipping recipient, which is designed as an opening and tear-open aid and extends from the edge across the sealed and cut-to-length edge of the packaging bag towards the bag. For example, the marking or weakening is formed by an incision. Alternatively, the marking or weakening can also be designed as a U- or V-shaped cutout. Furthermore, several markings or weakenings, such as two, can be provided, which are spaced apart by up to 20 millimeters.A cutout is typically up to five millimeters wide and, like the incision, measures up to 20 millimeters long. Furthermore, the incision or cutout extends essentially in the longitudinal direction of the packaging material web. Alternatively, it extends at an acute angle of up to 25 degrees to the longitudinal direction of the packaging material web.

[0084] Furthermore, the packaging material web can be provided with a thread-like web made of a material that is stronger than the packaging material web, such as plastic, yarn, kraft paper, or the like, adjacent to, adjacent to, and / or congruent with an indentation or cutout of the packaging bag. This thread-like web extends in the longitudinal direction of the entire packaging material web and thus also extends over the entire length of the packaging bag. As an alternative to the thread-like web, the packaging material web can instead have some type of material weakening, such as creasing or perforation. When the cut edge is pulled against each other on both sides at the marking, the packaging bag is torn open with reduced force. When a thread-like web, creasing, or perforation is used, further tearing along this web, creasing, or perforation is simplified, which makes opening the packaging bag convenient.

[0085] A special feature can be achieved in terms of process technology by introducing the marking or weakening into the packaging material web or packaging bag, in particular into the edge of the bag, only after the goods to be shipped have been inserted and the packaging bag has been closed.

[0086] Preferred embodiments are specified in the subclaims.

[0087] In the following, further properties, features and advantages of the invention will become clear by describing preferred embodiments of the invention with reference to the accompanying exemplary drawings, in which:

[0088] Figure 1: a schematic perspective view of an exemplary embodiment of a packaging material web according to the invention;

[0089] Figure 2: a schematic perspective view of a further exemplary embodiment of a packaging material web according to the invention; Figure 3: a schematic side view of the packaging material web from Figure 1; and

[0090] Figure 4: a schematic detail of a shaft position of an inventive

[0091] Packaging material web.

[0092] In the following description of exemplary embodiments of packaging material webs according to the invention, which are generally provided with the reference number 1, the exemplary embodiments of the packaging material webs 1 according to the invention are basically to be understood as a multi-layer sandwich structure made of several layers of material webs made of paper, cardboard and / or carton that are suitable for packaging purposes and that are selected in an arrangement suitable for packaging purposes, in particular for providing a good damping function with, at the same time, good deformability of the packaging material web to form the desired packaging bag for wrapping a shipping article.

[0093] All embodiments of packaging material webs 1 according to the invention are characterized, firstly, by an alternating arrangement of flat layers, for example, made of cardboard, paper, or carton, and dampening and / or cushioning layers, in particular made of cardboard, carton, or paper, and by the fact that the layers forming the top and bottom are each realized by flat material layers. A further characterizing feature of the packaging material webs according to the invention is that a flat material layer forming the top or bottom is coated, at least in sections, with an adhesive, in particular a cold-sealable adhesive, which closes the packaging pocket by transforming the packaging material web into a closed envelope and activating the adhesive.

[0094] According to the exemplary embodiment according to Figure 1, the packaging material web 1 according to the invention comprises an outer layer 3 forming an outer side of the packaging bag to be formed, for example made of paper, cardboard or carton, in particular with a grammage in the range of 20 g / m 2 up to 420 g / m 2 , preferably made of kraftliner paper, in particular with a grammage in the range of 50 g / m 2 up to 420 g / m 2 , a cushioning layer, in particular sinusoidal wave-shaped, formed as a wave layer 5 on the outer layer 3, for example made of paper, cardboard or carton, in particular with a grammage in the range of 7 g / m 2 150 g / m 2 , preferably a paper with a grammage in the range of 20 g / m 2 up to 120 g / m 2, and an inner layer 7 lying on the corrugated layer 5, forming an inner side of the packaging bag to be formed, for example made of paper, cardboard or carton, in particular with a grammage in the range of 20 g / m 2 150 g / m 2 , preferably a paper with a grammage in the range of 50 g / m 2 up to 150 g / m 2 . The inner layer 7 is coated on the inside of the packaging bag, ie on its surface facing away from the outer layer 3 and facing the inside of the packaging bag, with an adhesive, in particular a cold-sealable adhesive, which is indicated by the reference numeral 9.

[0095] Figure 2 shows a further exemplary embodiment of a packaging material web i according to the invention, which is based on the same basic principle as the packaging material web i from Figure 1, but has additional layers: Between the inner layer 7 and the corrugated layer 5 there is a sequence of an intermediate layer 11 made of paper, cardboard or carton, which can preferably be designed analogously to the inner layer 7, and a further corrugated layer 13 made of paper, cardboard or carton, which is designed in particular according to the corrugated layer 5 and / or made of the same material and is in particular sinusoidal in shape, to form a sandwich structure, such that the intermediate layer 11 rests against the corrugated layer 5 assigned to the outer layer 3 and the further corrugated layer 13 rests against both the intermediate layer 11 and the inner layer 7.According to this construction principle, any sandwich structures can be produced from packaging material webs according to the invention and adapted to the required buffering capacity, damping capacity, stability and / or deformability depending on the shipping article.

[0096] Figure 3 shows a side view of the packaging material web 1 according to Figure 1, and the adhesive layer 9 is indicated. It should be understood that the solid line with the reference symbol 9, which represents the adhesive layer, is intended only to schematically indicate and clarify the position or application of the adhesive layer 9, but is not to be understood as being true to scale, particularly with regard to the layer thickness of the adhesive 9.

[0097] Figure 4 indicates the characterization and design flexibility in the manufacture and design of the corrugated layers 5 and 13, respectively. In the preferred embodiments, these corrugations are formed as uniform, sinusoidal E-flutes. The selected E-flutes are characterized, among other things, by a corrugation height h oriented transversely to the longitudinal extent L of the packaging material web 1 in the range of 1.0 mm to 1.9 mm, and a corrugation pitch t measured transversely to the longitudinal extent L and transversely to the height direction H in the width direction B in the range of 2.6 mm to 3.5 mm. This E-flute formed in this way has proven particularly advantageous for packaging purposes.It has a low overall height and a very flat design, is highly rigid, has good damping properties for absorbing and cushioning shocks to protect the goods inside the shipping bag, and is easily formable, allowing the aforementioned folding and movement of the folded sections towards each other to be easily achieved. A further advantage is that the E-flute is very easy to print on, for example, to label the packaging bags or to add stickers or advertising. Furthermore, it can be used to optimize the storage of a packaging material roll with a flute layer 5, 13, as the roll diameter can be kept small while maintaining the highest possible number of running meters on the roll, thus saving space.

[0098] In addition to the advantages of the E-flute, other flutes are also conceivable, depending on the requirements of the shipping bag and / or the packaging material web. Preferably, the even flatter F-flute or the taller D-flute, B-flute, or C-flute are used as alternatives to the E-flute. The F-flute has different damping properties, and the structurally higher flutes have, in particular, greater damping properties. The flute layer 5, 13 has alternating peaks 15 and valleys 17, which, according to the preferred embodiments, are evenly distributed in the width direction B and always have the same flute height. Referring again to Figure 2, it can be seen that the flute layer 13 assigned to the inner layer 7 has a smaller flute pitch t but a higher flute height h than the flute layer 5 assigned to the outer layer 3.The features disclosed in the above description, the figures and the claims may be important both individually and in any combination for the realization of the invention in the various embodiments.

[0099] LIST OF REFERENCE SYMBOLS

[0100] 1 packaging material web

[0101] 3 Outer layer

[0102] 5 Wave position

[0103] 7 inner layer

[0104] 9 Adhesive ii Intermediate layer

[0105] 13 Wave position

[0106] 15 Wellenberg

[0107] 17 wave trough

[0108] L longitudinal direction

[0109] B Width direction

[0110] H Height direction h Wave height t Wave pitch

Claims

REQUIREMENTS 1. Packaging material web (i) which can be formed into a packaging bag for wrapping a shipping item, comprising an outer layer (3), an inner layer (7) and a cushioning layer (5) arranged between the outer layer (5) and the inner layer (7), wherein at least one layer comprises paper, cardboard or carton, characterized in that the inner layer (7) is provided at least partially with an adhesive coating (9) which is particularly suitable for cold sealing.

2. Packaging material web (1) according to claim 1, characterized in that the adhesive coating (9) is arranged on a surface of the inner layer (7) facing away from the outer layer (3).

3. Packaging material web (1) according to claim 1 or 2, characterized in that the cushioning layer (5) has a particularly sinusoidal wave pattern, in particular is designed as a wave pattern, wherein in particular a wave of the wave pattern (5) is oriented transversely, in particular perpendicularly, to the longitudinal direction of the packaging material web (1), and / or is made of paper, cardboard, carton or foam in particular with a density of less than 90 kg / nU.

4. Packaging material web (1) according to claim 1 or 2, characterized in that the cushioning layer (5) comprises flake-like filling material and / or a foam, such as PUR (polyurethane foam) or the like.

5. Packaging material web (1) according to one of the preceding claims, characterized in that the material of the outer layer (3) has a basis weight in the range of 20 g / m² 2 up to 420 g / m² 2has, in particular the outer layer (3) being a kraftliner paper, especially with a basis weight in the range of 50 g / m² 2 up to 420 g / m² 2 preferably in the range of 100 g / m² 2 up to 130 g / m² 2 , or a testliner paper, especially with a basis weight in the range of 50 g / m² 2 up to 230 g / m² 2 preferably in the range of 100 g / m² 2 up to 150 g / m² 2 , is. Packaging material web (i) according to one of the preceding claims, characterized in that the material of the inner layer (7) has a basis weight in the range of 20 g / m² 2 up to 150 g / m² 2 has, in particular the inner layer (7) being a paper, especially with a basis weight in the range of 50 g / m² 2 up to 150 g / m² 2 , preferably in the range of 80 g / m² 2 up to 120 g / m² 2, is. Packaging material web (1) according to one of the preceding claims, characterized in that the material of the cushioning layer (5) has a basis weight in the range of 20 g / m² 2 up to 150 g / m² 2A packaging material web (1) according to one of the preceding claims, characterized in that the cushioning layer (5) is designed as a sinusoidal corrugation, wherein in particular a corrugation height (h) (amplitude) is in the range of 0.5 mm to 5.0 mm and / or a corrugation pitch (t) (wavelength) is in the range of 1.0 mm to 10 mm. A packaging material web (1) according to one of the preceding claims, characterized in that the cushioning layer (5) comprises recycled paper, in particular with a proportion of at most 50% or at most 70% virgin fiber paper material, wherein in particular the cushioning layer (5) consists of recycled paper.Packaging material web (1) according to one of the preceding claims, characterized in that a sequence of an intermediate layer (11) made of paper, cardboard or carton and a further cushioning layer (13), in particular designed according to the cushioning layer, is arranged between the inner layer (7) and the cushioning layer (5) to form a sandwich structure such that the intermediate layer (11) abuts the cushioning layer (5) associated with the outer layer (3) and the further cushioning layer (13) abuts the intermediate layer (11) and the inner layer (7). Packaging material web (1) according to claim 10, characterized in that the cushioning layer (5) associated with the outer layer (3) differs from the cushioning layer (13) associated with the inner layer (7) in particular with regard to the flute type, flute height (h) and / or flute pitch (t). Packaging material web (i), in particular according to one of the preceding claims, which can be formed into a packaging bag for wrapping a shipping item, made of paper, cardboard or carton and with a coating of, in particular, a cold-sealable adhesive, characterized in that the adhesive (9) comprises natural rubber latex, a styrene-acrylate copolymer and preferably a defoamer, wherein the adhesive (9) preferably has a pH value of at least pH 8, more preferably of at least pH 9. Packaging material web (1) according to claim 9, characterized in that the adhesive (9) comprises at least one further component, selected from a wetting agent, a stabilizing agent, a base, an antiblocking agent, a UV tracer, an ethylene-vinyl acetate copolymer and a polyvinyl acetate.Packaging material web (1) according to one of the preceding claims, characterized in that the coating contains the adhesive (9) in an amount in the range of 2 g / m. 2 up to 20 g / m² 2 , preferably 10 g / m² 2 up to 12 g / m² 2 comprising. Packaging material web (1) according to one of the preceding claims, characterized in that the adhesive (9) contains the defoamer in an amount in the range of 0.2 wt.% to 0.8 wt.%, preferably in the range of 0.4 wt.% to 0.6 wt.%. Packaging material web (1) according to one of the preceding claims, characterized in that the adhesive (9) has a water content in the range of <10 wt.% or 30 wt.% to 70 wt.%, preferably in the range of <10 wt.% or 40 wt.% to 60 wt.%. Packaging bag for wrapping a shipping item, formed by forming a packaging material web (1) designed according to one of the preceding claims. Packaging bag according to claim 17, having dimensions ranging from 30 mm to, in particular, 350 mm (length) x 50 mm to 1000 mm (width) x 1 mm to 200 mm (depth). Packaging bag according to claim 17 or 18, wherein at least one edge forming a border of the packaging bag, in particular two overlapping edges, is formed by cutting, in particular by trimming, the packaging material web (1), in particular by means of a rotary or guillotine knife. Packaging bag according to any one of claims 17 to 19, wherein the cut edge, in particular the cut edge, is slightly frayed or ragged and / or blunt such that the packaging bag can be manipulated manually at the cut edge without injury.Packaging bag according to one of claims 17 to 20, wherein the adhesive coating (9) is designed and in particular is applied over the entire surface of the inner layer (7) in such a way that movement of an article arranged in the packaging bag relative to the inner layer (7) is impaired.

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