Protective bubble wrap and repair tape for repairing protective bubble wrap

Abstract

. Protective cushioning film as, in particular, thermally insulating, packaging protection with at least one layer of a bubble film (3) with bubbles (3.1), characterized by at least one layer of a reinforcing film (2) which has a reinforcing network (2.1) to increase the strength, wherein the bubble film (3) and the reinforcing film (2) are based on the same type of polymer, in particular polyethylene.

Description

[0001] The present invention relates to a protective cushioning film as, in particular, thermally insulating, packaging protection comprising at least one layer of a bubble wrap film with bubbles. A further aspect of the invention is a method for producing such a protective cushioning film. Furthermore, a repair tape and a method for repairing the protective cushioning film according to the invention with such a repair tape are disclosed.

[0002] These types of protective bubble wrap are used to protect a wide variety of goods, such as delicate furnishings or food products. For this purpose, the bubble wrap is typically wrapped around the goods requiring protection, thus preventing both surface damage and temperature-related damage to the goods, especially during transport.

[0003] To protect sensitive goods from dents, scratches, or other surface damage, protective bubble wrap is known to consist of at least one layer of bubble wrap. The numerous bubbles, usually filled with air, provide comprehensive cushioning of the object encased in the bubble wrap, effectively dampening external forces such as vibrations or impacts to a harmless level.

[0004] Due to the low thermal conductivity of the air trapped within the bubbles, such a protective cushioning film can, to a certain extent, achieve thermal decoupling of the goods from their environment. In this way, not only can external forces be mitigated, but potentially damaging temperature fluctuations can also be dampened, allowing the goods to be stored for extended periods without additional cooling.

[0005] A classic example of such protective bubble wrap, commonly referred to as air cushion film, is shown in WO 2020 / 141376 A1. These types of protective bubble wrap are usually made of plastic, which allows for cost-effective production and is also responsible for their characteristic lightness and flexibility. However, a disadvantage is often their low strength, which can make them susceptible to tearing. Such a tear can quickly develop into a larger gap and significantly reduce the protective effect of the bubble wrap. The risk of tearing is particularly high when sharp or pointed objects come into contact with the protective bubble wrap.

[0006] Against this background, the invention aims to improve the protective capacity of a protective bubble wrap film.

[0007] In the case of a protective bubble wrap of the type mentioned above, this task is solved by at least one layer of a reinforcing film which has a reinforcing network to increase the strength, wherein the bubble wrap and the reinforcing film are based on the same type of polymer, in particular polyethylene.

[0008] By adding at least one layer of reinforcing film in addition to the layer of bubble wrap, the strength of the protective cushioning film can be significantly increased. For this purpose, the reinforcing film features a reinforcing mesh which, due to its grid-like structure, can gradually stop the propagation of surface damage. As a result, the reinforcing film—and therefore the protective cushioning film—exhibits significantly higher tear and tensile strength compared to bubble wrap alone. Depending on the mesh size of the reinforcing mesh, tearing caused by an external hazard, which could otherwise penetrate the protective cushioning film, can be completely prevented. Furthermore, the protective cushioning film retains its characteristic lightness and flexibility, as the reinforcement provided by the mesh is applied only at specific points and the film thickness is not increased across the entire surface.

[0009] The increased strength of the protective cushioning film is therefore achieved primarily through the shape of the reinforcing network integrated into the reinforcement film. This makes it possible to manufacture the entire reinforcement film from a single material, specifically a common polymer type, similar to bubble wrap. The inclusion of other materials to increase the strength of the protective cushioning film is therefore unnecessary.

[0010] The term "polymer type" is used in this application as a collective term for any polymer. Examples of polymer types are polyethylene, polypropylene, PVC, PC, or polystyrene.

[0011] The monomers that form a polymer can be linked together in different ways, particularly with regard to the chain structure or branching density. This allows a single polymer type to exhibit several variants with different material properties, which are subsequently referred to as "polymer type variants." Exemplary polymer type variants of the polymer type polyethylene (PE) are high-density polyethylene (HDPE) and low-density polyethylene (LDPE), as well as blends based on these.

[0012] If the bubble wrap and the reinforcing film are made from the same type of polymer, a single-material protective cushioning film can be produced, which can be recycled in a single process step with minimal effort. The separation of the reinforcing film and the bubble wrap as a preparatory step for recycling can be advantageously omitted. Furthermore, depending on the polymer type, purely mechanical recycling of the protective cushioning film is possible without the use of environmentally harmful chemicals.

[0013] Advantageous further developments of the protective cushioning film according to the invention are specified in the dependent subclaims.

[0014] For particularly easy recycling, it can be advantageous if the protective bubble wrap consists of only a single polymer type, especially polyethylene. Even small amounts of another monomer, as is the case with copolymers such as ethylene-vinyl acetate, can negatively affect recyclability, and especially the quality of the recycled material.

[0015] An advantageous embodiment of the invention provides that the reinforcing film has a multilayer structure, with the reinforcing network forming one of the layers. Such a multilayer structure allows the reinforcing film to be tailored to a specific strength requirement.

[0016] For the thermal protection of heat-sensitive goods, it can be advantageous for the reinforcing film to have a metallization layer for heat reflection. Direct heat radiation can be reflected by such a metallization layer. In particular, temperature-sensitive goods can thus be shielded from, for example, incoming sunlight. For the sake of simplicity, the metallization layer can be applied to only one side of the reinforcing film. Alternatively, the metallization layer can also be applied to both sides of the reinforcing film to further enhance heat reflection.

[0017] The metallization layer is preferably a PE film with an aluminum coating. This metallization coating is to be so thin, preferably microscopic, that the purity of the protective cushioning film remains unaffected from a recycling perspective.

[0018] Furthermore, it has proven advantageous for the reinforcing film to have a carrier layer. The use of such a carrier layer can facilitate the particularly simple bonding of further layers to form the reinforcing film, for example, by thermal lamination. In particular, the carrier layer can be used to support the reinforcing mesh, resulting in a particularly strong and simultaneously resource-efficient composite.

[0019] Furthermore, it is proposed that the reinforcing mesh and / or the metallization layer and / or the carrier layer be based on the same polymer type, in particular polyethylene. This would result in a monomaterial reinforcing film that can be recycled in an environmentally friendly manner. Moreover, the temperature ranges at which the reinforcing mesh and the carrier layer can be bonded together particularly easily can overlap in a process-compatible manner.

[0020] In a preferred embodiment of the protective cushioning film, the polymer type of the metallization layer is based on a different polymer type variant than the polymer type of the carrier layer and / or the reinforcing network. While maintaining the purity of the polymer types, the strength of the reinforcing film can be further increased by forming its individual layers—i.e., the metallization layer and / or the carrier layer and / or the reinforcing network—based on different polymer type variants. Because these layers share the same common polymer type, the basis weight of the reinforcing network is not significantly affected.

[0021] It has proven particularly advantageous if the metallization layer is based on a stronger polymer type than the substrate layer and / or the reinforcing mesh. By using a stronger polymer type as the material base for the metallization layer, the strength of the reinforcing film can be increased across its entire surface, including in the spaces between the film layers that are not covered by the reinforcing mesh.

[0022] Furthermore, a fundamentally more robust base for the metallization layer can simplify the metallization process. For example, the coating of the metal, particularly aluminum, can be pressed firmly onto a film made of a rigid polymer type without the resulting metallization layer exhibiting subsequent pressure-induced damage. In contrast, the carrier layer for advantageously bonding the reinforcing network to, for example, the metallization layer, can preferably be made of a softer polymer type. Since the strength of the reinforcing network is essentially determined by its shape, polymer types that do not significantly restrict its deformability and flexibility are particularly advantageous.

[0023] In a preferred embodiment, the metallization layer is based on biaxially oriented polyethylene (BOPE). With regard to material costs, the carrier layer and the reinforcing network can be based on conventional polymer types such as LDPE or LLDPE without impairing their functionality.

[0024] In certain applications, it can be advantageous if the reinforcing film has a higher tensile strength and / or tear resistance than the bubble wrap, preferably at least one and a half times higher tensile strength and / or tear resistance than the bubble wrap, particularly preferably at least twice as high tensile strength and / or tear resistance as the bubble wrap, and especially a tensile strength in the range of 110 N / 5 cm to 190 N / 5 cm according to test standard ASTM D882 and / or especially a tear resistance in the range of 20 kg to 55 kg according to test standard ASTM D1117. Such high tensile strength and / or tear resistance can provide particularly strong protection of the goods against, for example, sharp-edged hazards.

[0025] According to a structurally advantageous embodiment, the reinforcing film has a greater thickness than the bubble wrap, preferably a maximum of six times greater than the bubble wrap, particularly preferably a maximum of three times greater than the bubble wrap, and especially including the metallization layer, a maximum thickness of 180 µm. Even with the aforementioned thicknesses of the reinforcing mesh, the protective cushioning film can gain significantly in strength. Oversizing the reinforcing mesh and the associated material expenditure can be avoided.

[0026] It is further proposed that the reinforcing film have a higher basis weight than the bubble film, preferably a maximum of six times higher basis weight than the bubble film, particularly preferably a maximum of three times higher basis weight than the bubble film, and in particular, including the metallization layer, a maximum basis weight of 60 g / m². 2, exhibits. With a basis weight of the reinforcing film in the aforementioned ranges, a sufficiently high strength of the reinforcing film can already be achieved with appropriate design of the reinforcing network, which will be discussed in more detail in a later section of the application. Therefore, to achieve the aforementioned tensile and tear strength ranges, it is not necessary to increase the basis weight of the reinforcing film by orders of magnitude compared to the bubble wrap. As a result, the protective cushioning film can still have a low overall weight and be easy to handle.

[0027] According to a preferred embodiment, the reinforcing foil together with the metallization layer has a basis weight in the range of 40 g / m² while maintaining the aforementioned strengths. 2 up to 60 g / m² 2 at a thickness of 110 µm to 180 µm.

[0028] In an advantageous embodiment, the invention includes at least one end layer designed as a reinforcing film. An end layer typically forms the outermost layer of the protective bubble wrap and is preferably robust for functional reasons. This robustness can be achieved by designing the end layer as a reinforcing film. This allows subsequent layers of the protective bubble wrap to be protected particularly effectively from damage. The service life of the protective bubble wrap can thus be extended, making it advantageously reusable.

[0029] In this context, it can be advantageous if the protective bubble wrap has two outer layers with at least one intermediate layer, designed as a bubble wrap film, positioned between them. This results in a sandwich-like arrangement of the outer layers and the intermediate layer, which protects the intermediate layer on all sides.

[0030] It has also proven advantageous to seal the edges of the outer layers. This allows the intermediate layer to be protectively encapsulated by the outer layers. The edge sealing also results in a slip-resistant bond between the outer and intermediate layers. Such a multi-layered protective cushioning film can be characterized by particularly long-term dimensional stability. This type of protective cushioning film can be reused many times.

[0031] Furthermore, it is advantageous if at least one intermediate layer is designed as a bubble wrap film. An intermediate layer designed as a bubble wrap film ensures the long-term cushioning and thermal insulation properties of the protective bubble wrap film. The bubble wrap film, which is more susceptible to surface damage, especially cracking, can be advantageously protected by the outer layers, which are designed as reinforcing films. This reduces the likelihood of defective bubbles, which significantly contribute to cushioning and thermal insulation.

[0032] Depending on the application, it can also be advantageous for the interlayer to have a metallized layer. Such an interlayer can enhance the heat-reflecting function of the protective bubble wrap, if required. The interlayer can, for example, be designed as a metallized bubble wrap film with the metallized layer applied to one or both sides. Alternatively, the interlayer could simply consist of the metallized layer described above.

[0033] In a preferred embodiment of the invention, several intermediate layers are arranged in a stacked fashion between the outer layers. This stacked arrangement of the intermediate layers allows the protective cushioning film to be precisely configured for a specific application with regard to its protective effect. To meet higher protection requirements for particularly fragile and / or temperature-sensitive goods, for example, several layers of bubble wrap and / or other metallized intermediate layers may be necessary. Furthermore, this can result in a protective redundancy that makes isolated damage to the protective cushioning film tolerable with respect to the required protective effect.

[0034] A preferred embodiment of the protective bubble wrap film, with a view to enhanced surface and thermal protection, provides at least one layer of bubble wrap as an intermediate layer and at least one outer layer of a reinforcing film with a metallization layer. To protect the protective bubble wrap film from degradation caused by sunlight, the metallization layer can be oriented towards the outside.

[0035] According to an advantageous embodiment of the invention, the reinforcing network has a higher, preferably at least three times higher, particularly preferably at least five times higher, and especially at least ten times higher, tensile strength and / or tear strength than the carrier layer. Such a reinforcing network can transfer its tensile and / or tear strength to the entire reinforcing film. This allows the carrier layer to remain thin and the overall material requirement of the reinforcing film to be reduced in a resource-saving manner.

[0036] An advantageous embodiment of the invention provides that reinforcing threads form the reinforcing network. The reinforcing network can be formed easily using a large number of individual reinforcing threads. Furthermore, a particularly flexible design of the reinforcing network based on reinforcing threads is possible.

[0037] In this context, it is further proposed that the reinforcing threads be segmented. Segmenting the reinforcing threads can counteract large-scale cracking of the reinforcing film.

[0038] If a single, particularly long reinforcing thread, for example, becomes defective and creates a weak point in the reinforcing film, a crack may extend along this defective reinforcing thread across the entire surface of the reinforcing film. If, instead, this reinforcing thread is designed as a series of segmented, i.e., slightly spaced, reinforcing threads, such cracking can be localized.

[0039] It has proven particularly advantageous if the reinforcing threads are oriented along the surface of the reinforcing film in at least two different directions, preferably in at least three different directions, and most preferably in at least four different directions. Such a large number of different orientations of the reinforcing threads prevents cracking of the reinforcing film, regardless of the direction of the cracks. The number of directions can be adjusted accordingly, depending on the required strength.

[0040] In this context, it is further proposed that the reinforcing threads, oriented in at least two different directions, form a grid-like reinforcement structure, wherein the reinforcing threads of a grid-like reinforcement structure are essentially perpendicular to each other. Such a grid-like reinforcement structure can counteract cracking of the reinforcing film particularly effectively. For many applications, the necessary tensile and / or tear strength can be achieved with a single grid-like reinforcement structure.

[0041] According to a manufacturability-friendly design, the reinforcement mesh is structurally formed as a superposition of two reinforcement structures, wherein the two reinforcement structures are rotated relative to each other. Such a reinforcement mesh can be manufactured in a particularly simple manner. In this context, a rotation angle in a preferred range of 25 degrees to 65 degrees between the grid-like reinforcement structures has proven to be particularly advantageous. This allows for the formation of a superimposed reinforcement structure that can effectively prevent crack formation regardless of direction.

[0042] For maximum tensile and / or tear strength, the reinforcing film can have a reinforcing structure that combines the aforementioned advantageous features. This can result in reinforcing structures with a large number of differently oriented reinforcing threads, whereby the reinforcing threads can be partially segmented.

[0043] An advantageous embodiment of the invention provides that the bubbles are filled with a thermal insulating gas, preferably an air-noble gas mixture, particularly argon, to increase thermal insulation. By using thermal insulating gases to fill the bubbles, the thermal insulation of the bubble film, and thus of the protective cushioning film, can be increased. For this purpose, the air typically contained in the bubbles can preferably be partially replaced by a noble gas. Noble gases are particularly suitable for improving thermal insulation due to their low chemical reactivity and the resulting low thermal conductivity. In particular, argon, as the most abundant noble gas in the Earth's atmosphere, can be advantageously used for this purpose due to cost considerations.

[0044] A further aspect of the invention relates to a repair tape for repairing protective bubble wrap, which is designed as a reinforcing tape, particularly a rollable tape, comprising a reinforcing mesh, a carrier layer, and an adhesive layer for bonding firmly to the protective bubble wrap, wherein the reinforcing mesh and the carrier layer are based on the same type of polymer, particularly polyethylene. Such a repair tape can be used to cover any surface damage, in particular tears and / or gaps, in the protective bubble wrap.

[0045] Another possible application is securing the protective bubble wrap to prevent it from slipping. For this purpose, the protective bubble wrap can be attached to the goods being protected using the repair tape, for example.

[0046] Another advantage of the repair tape lies once again in its single-material composition. This allows the repair tape and the protective cushioning film to be made from the same type of polymer and recycled together in a single, low-effort process step.

[0047] In certain applications, it can be advantageous for the reinforcing film to have a metallization layer for heat reflection. A repair tape can be used over a metallized reinforcing film to restore the complete heat reflection of damaged protective bubble wrap. If a repair tape without such a metallization layer were used to repair a damaged protective bubble wrap, the repaired area would still have gaps in the heat reflection necessary to protect the goods. This gap could allow sunlight to directly heat the goods, quickly rendering them unusable. Damaged areas in heat-reflective protective bubble wrap can be completely sealed with a repair tape featuring a metallized reinforcing layer.

[0048] To protect the inner layers of the protective bubble wrap from sun-induced aging effects, the metallization layer of the reinforcing film can form the outermost layer of the repair tape.

[0049] It has proven particularly advantageous if the polymer type of the metallization layer is based on a different polymer variant than the polymer type of the substrate and / or the reinforcing mesh. In this way, the metallization layer and / or the reinforcing mesh and / or the substrate can exhibit material properties adapted to their respective functions without requiring the use of different polymer types. For example, the metallization layer can be made of a stronger polymer variant, particularly biaxially oriented polyethylene (BOPE), compared to the substrate, in order to increase the overall strength of the reinforcing film.

[0050] It has proven aesthetically advantageous if the repair tape has a finishing layer that matches the finishing layer of the protective bubble wrap. Using such a repair tape allows damage to the protective bubble wrap to be concealed, as the finishing layers of the bubble wrap being repaired and the repair tape blend seamlessly into one another. As a result, the damage to the protective bubble wrap becomes virtually invisible to the naked eye after the repair.

[0051] Another object of the invention is a method for producing a protective cushioning film, wherein the bubble film and the reinforcing film are formed on the basis of the same polymer type, in particular polyethylene.

[0052] The manufacturing process offers the same advantages and properties as described above in relation to the protective bubble wrap.

[0053] According to an advantageous embodiment, it is proposed that the reinforcing mesh, the carrier layer, and, in particular, the metallization layer, be thermolaminated together to form the reinforcing film. Thermolamination enables a particularly environmentally friendly production of the protective cushioning film without the use of other chemicals such as adhesives.

[0054] Furthermore, it can be advantageous to thermolaminate at least one layer of reinforcing film to at least one layer of bubble wrap. This results in a particularly strong bond between the reinforcing film and the bubble wrap, which together form a protective cushioning film. Alternatively or additionally, different layers of the protective cushioning film can be added loosely to customize the level of protection.

[0055] According to another advantageous embodiment, two reinforcing layers are sealed at their edges to protect at least one intermediate layer, designed as a bubble wrap film, located between the layers. In this way, the intermediate layers, which are particularly sensitive to mechanical stress, can be enclosed by the more robust outer layers, providing both protection and stability. This reduces the likelihood of damage to the intermediate layer and thus to the entire protective cushioning film. As a result, the service life of the protective cushioning film can be significantly extended, which can have a positive impact on its recyclability.

[0056] As a further object of the invention, a repair method for repairing a protective bubble wrap film with a repair tape is specified, wherein a strip of repair tape is cut from the repair tape and glued onto a damaged area to be repaired, in particular a tear, of the protective bubble wrap film.

[0057] The repair process offers the same advantages and properties as those already mentioned in relation to the repair tape.

[0058] Further details of a protective bubble wrap film according to the invention and the associated manufacturing method, as well as a repair tape according to the invention, including the repair method, are explained in more detail below with reference to the accompanying drawings of various embodiments. These show: Fig. 1 a schematic representation of a protective bubble wrap; Fig. 2 a sectional view of a section of the protective bubble wrap according to Fig. 1; Fig. 3-5 different variants of the protective bubble wrap as shown in the illustration Fig. 2; Fig. 6 a perspective top view of a section of a reinforcing film according to the embodiment shown in Fig. 1; Fig. 7a - 7c a schematic representation of reinforcing threads for the purpose of explaining the resulting reinforcement structures; Fig. 8 a perspective side view of an embodiment of a manufacturing process for producing the reinforcing foil; Fig. 9 a schematic representation of a repair tape; Fig. 10 a schematic representation of the top and bottom of a repair tape strip of the repair tape according to Fig. 9, and Fig. 11 - 12 a schematic representation to explain the repair procedure of a protective bubble wrap film with the repair tape strip according to Fig. 9 and Fig. 10.

[0059] Based on the Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5 The basic structure of the protective cushioning film 1 according to the invention is first explained.

[0060] The Fig. Figure 1 shows an embodiment of a protective cushioning film 1 with an upper layer of a reinforcing film 2 and a layer of bubble film 3 arranged below it.

[0061] The protective bubble wrap 1 shown can be precisely fitted around various types of goods, such as temperature-sensitive foodstuffs or fragile decorative objects, to provide protective packaging. Pre-shaped protective bubble wrap 1 could also be used, for example, as covers for larger shipments or smaller transport bags for pharmaceuticals. During transport, such goods are often exposed to vibrations, impacts, and / or prolonged storage in direct sunlight.

[0062] Given the diverse risks involved, the protective cushioning film 1 must possess various protective properties. For this purpose, the properties of the bubble wrap film 3 are combined with those of the reinforcing film 2. The protective cushioning film 1 can therefore be considered a type of composite film, although the individual film layers, according to the exemplary embodiment, are made of Fig. The two layers can lie loosely on top of each other. The reprocessing of such composite films can typically be complex, as the various protective properties are usually achieved through the use of different materials, which must be separated from each other prior to recycling. However, in the protective cushioning film 1 according to the invention, the reinforcing film 2 and the bubble film 3 are based on the same polymer type, in particular polyethylene. This eliminates the need to separate the different film layers of the protective cushioning film 1 as a prerequisite for further recycling. This can result in environmentally friendly and low-effort recycling of the protective cushioning film 1.

[0063] The structural aspects of the reinforcing film 2 and the bubble film 3 are explained in more detail below, under which the mechanical and thermal protection requirements can be met while maintaining the advantageous purity of the protective cushioning film 1.

[0064] By applying a layer of the reinforcing foil 2 in the embodiment according to Fig. The primary purpose of the reinforcement is to increase the strength of the protective cushioning film 1, making it more resistant to potentially damaging influences from, for example, external hazards 16. This prevents the formation of surface damage such as cracks or holes. For this purpose, the reinforcement film has a reinforcement network 2.1, which is the main source of the increased strength of the protective cushioning film 1. The reinforcement network 2.1 is formed by a large number of reinforcement threads 2.4, the increased strength of which is largely due to an enlarged diameter. The grid-like arrangement of the reinforcement threads 2.4 across the entire surface of the reinforcement film 2 ensures that their strength is distributed across the entire film.

[0065] A detailed explanation of advantageous arrangements of the reinforcing threads 2.4 is given in the following. Fig. 6 and Fig. 7 related sections will be provided later in the registration process.

[0066] In addition to mechanical protection, the reinforcing film 2 can also be used to enhance thermal protection. For this purpose, the reinforcing film 2 has a metallization layer 4, which is particularly visible in the lateral section view as shown in Figure 1. Fig. 2 can be seen. Due to the metallization layer 4, incident sunlight can be reflected at the surface of the protective bubble wrap 1 and therefore does not penetrate, or at least only in a weakened form, to the goods 15 requiring protection. Likewise, the layers of the protective bubble wrap 1 arranged below the metallization layer 4, i.e., the remainder of the multi-layered reinforcing film 2 and the bubble wrap 3, are shielded from UV-induced degradation.

[0067] In the illustrated embodiment, the metallization layer 4 is a film based on a particularly robust polyethylene variant, namely biaxially oriented polyethylene (BOPE), with an ultra-thin aluminum coating. The use of such a robust polymer type fulfills a dual function: On the one hand, the BOPE enables the aluminum coating to be applied using a simple pressing process. On the other hand, the metallization layer 4 also forms the film surfaces located between the reinforcing mesh 2.1, which are now also reinforced due to the BOPE. In this way, the strength of the reinforcing film 2 is increased across its entire surface, except in the areas of the reinforcing mesh 2.1.

[0068] Bubble wrap 3 also performs a dual function to meet the diverse protective requirements placed on protective cushioning film 1. Like the Fig. As shown in Figure 1, the bubble film 3 is fundamentally characterized by a grid of bubbles 3.1, which are closely spaced and form a tight mesh across the entire bubble film 3. The sealed bubbles 3.1 are classically filled with air and therefore form a carpet of cushions. The shape of the bubbles 3.1 can be, for example, round or polygonal, in particular hexagonal.

[0069] The cushioning bubbles (3.1) distribute external forces over a large area and dampen them to a harmless level. While there is a risk that individual bubbles may become damaged and burst over time, such localized defects generally do not result in a significant reduction of the overall cushioning. Only above a certain size can such surface damage adversely affect the protective properties of the bubble wrap.

[0070] Secondly, the bubbles 3.1, due to the low conductivity of their filling material, often air, serve to thermally insulate the goods 15 requiring protection. In the exemplary embodiment, the bubbles 3.1 are at least partially filled with a technical thermal insulating gas, namely argon, to further increase the thermal insulation. Argon is a noble gas, which, due to its low reactivity, exhibits even lower thermal conductivity than air. As the most abundant noble gas in nature, argon is particularly suitable as a thermal insulating filling material for the bubbles 3.1 for cost reasons. The essentially seamless arrangement of the air-noble gas mixture encapsulated by the bubbles results in a bubble sheet 3 with consistently low thermal conductivity.

[0071] In contrast to the reinforcing film 2, or more specifically its metallization layer 4, it is not necessary to form the bubble film 3 based on a particularly strong polymer type. Instead, the bubble film can comprise common and therefore cost-effective polymer types, such as low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE). Such soft polymer types also advantageously possess the necessary elasticity for the formation of the bubbles 3.1 and are therefore particularly suitable as a base material for the production of the bubble film 3.

[0072] By combining the bubble wrap 3 with the reinforcing film 2, a protective cushioning film 1 with diverse protective properties can be produced without the need for different polymer types. This includes the metallization layer 4, the metallization of which is applied so thinly, preferably microscopically thinly, that it can be processed in the recycling process similarly to an ordinary polyethylene layer. The purity of the protective cushioning film remains unaffected from a recycling perspective.

[0073] Polyethylene is particularly suitable in terms of cost-effectiveness and low-effort recyclability. Depending on the application, however, the use of other polymer types would also be conceivable, such as the even more robust polypropylene. In any case, the versatile protective properties of the protective cushioning film 1 can be achieved using a single polymer type.

[0074] Advantageous designs of the multi-layered protective cushioning film 1 are described below with the aid of the Fig. 2, Fig. 3, Fig. 4 to Fig. 5 explained in more detail.

[0075] The Fig. Figure 2 shows an enlarged section of the protective bubble wrap 1 according to the diagram in Fig. Figure 1 shows a side sectional view of the embodiment. Accordingly, a reinforcing film 2, used as the upper outer layer 7, including its heat-reflecting metallization layer 4, and an intermediate layer 8 of a bubble film 3 arranged underneath are visible. For enhanced thermal insulation, the bubbles 3.1 of the bubble film 3 in the illustrated embodiment are filled with a thermal insulating gas 9, here an air-argon mixture.

[0076] To protect the tear-sensitive bubbles 3.1 of the bubble wrap 3, it can be advantageous if the protective cushioning film 1 is positioned such that the reinforcing film 2 is located on the side facing away from the goods 15 requiring protection. This is because, as the Fig. As illustrated in Figure 2, potentially crack-causing hazards 16 typically act on the protective bubble wrap 1 from the outside. In the illustrated embodiment, the hazard 16 first comes into contact with the reinforcing film 2, which, due to its particularly high strength, is able to prevent the hazard 16 from penetrating to the bubble wrap 3 – or more generally to the inner intermediate layers 8. In this way, relevant damage to the protective bubble wrap 1 can be effectively prevented.

[0077] The embodiment of the protective bubble wrap 1 in Fig. 3 essentially corresponds to the one in Fig. 2. The differences lie in the missing thermal insulation extensions, which is reflected in the fact that the reinforcement foil 2 according to Fig. 3 no metallization layer 4 and the bubble wrap 3 only has air-filled bubbles 3.1. This design of the protective cushioning film 1 is therefore more suited as mechanical surface protection. Depending on the protection requirements of the goods 15, such a protective cushioning film 1 can be used as a particularly cost-effective packaging protection.

[0078] In addition to damage caused by external hazards 16, there is also the possibility that the bubble wrap 3 may be damaged by the goods 15 themselves. For example, the bubble wrap 3 may become caught on pointed corners of the goods 15 during wrapping, which could result in tearing. To prevent such a risk, the protective cushioning film 1 can have two outer layers 7, which are designed as reinforcing film 2, cf. Fig. 4. In this case, the inner intermediate layer 8 made of bubble wrap 3 is protected on both sides from surface damage by the two outer layers 7. This protects the bubble wrap 3 both from damage caused by external hazards 16 and from damage caused by any protrusions of the goods 15 requiring protection themselves.

[0079] How this the Fig. As Figure 4 further shows, the two reinforcing films 2 arranged as end layers 7 of the protective cushioning film 1 can be sealed at their edges. This edge sealing of the end layers 7 encapsulates the inner intermediate layers 8. In the present embodiment, the bubble film 3 used as an intermediate layer 8 is enclosed by both end layers 7, which are designed as reinforcing films 2, and thus advantageously secured against displacement. This is because the bubble film 3 can often slip during a winding process and leave gaps in the protective covering. Alternatively, an intermediate layer 8, for example, a layer of bubble film 3, can be thermolaminated to a finishing layer 8, also designed as a reinforcing film 2, to form a solid bond. In this way, any movement of the intermediate layer 7 relative to the finishing layer 8 can be completely eliminated.

[0080] Depending on the application, a particularly high level of protection for the goods 15 may be required. If the goods 15 are extremely valuable or temperature-sensitive, for example in the case of pharmaceuticals, the protective effect of a single bubble wrap film 3 as an intermediate layer 8 may be considered insufficient. To ensure increased protection requirements, the protective cushioning film 1 can be modified according to a [missing information - likely a specific specification or method]. Fig. The embodiment shown in Figure 5 has several intermediate layers 8. By stacking several intermediate layers 8 on top of each other, the degree of protection of the protective cushioning film 1 can be individually adapted to the respective application.

[0081] The use of two layers of bubble wrap 3 as an intermediate layer 8 between two outer layers 7 creates redundancy, such that damage to a single intermediate layer 8 does not lead to any relevant reduction in the protective properties of the protective cushioning film 1. Furthermore, the effective thickness of the thermally insulating layer of bubbles 3.1, and thus the overall thermal protection effect of the protective cushioning film 1, is significantly increased.

[0082] According to Fig. Furthermore, there is the option of adding a metallization layer 4 as an additional intermediate layer 8 to the protective bubble wrap film 1. Alternatively or in addition to a single metallization layer 4, metallization of the bubble wrap film 3 would also be conceivable.

[0083] The metallization layer 4 reflects incident heat radiation, particularly incident sunlight, for the purpose of enhanced thermal protection. If the reinforcing films 2, designed as outer layers 7, are metallized, the goods 15 are protected from heat all around. Ideally, the metallization layer 4 of the outer layers 7 is always their outermost layer to protect all inner layers of the protective cushioning film 1 from degradation caused by sunlight. A protective cushioning film 1 tailored to the specific protection requirements of the goods 15 can be created by configuring the outer layers 7, the number and type of intermediate layers 8 (bubble film 3, metallization layer 4), and the optional metallizations. In particular, such a versatilely configurable protective cushioning film 1 can also meet particularly high thermal and mechanical protection requirements.

[0084] The following will be based on the Fig. 6 and 7a to 7c explain in more detail the advantageous configurations of the reinforcement network 2.1.

[0085] As previously described, a key element for achieving the increased strength of the reinforcing foil 2 is the reinforcing mesh 2.1. Fig. Figure 6 shows an enlarged view of a section of a reinforcing film 2, within which an exemplary reinforcing network 2.1 is formed. As can be seen there, the basic elements of the reinforcing network 2.1 form a multitude of reinforcing threads 2.4, which extend over the entire surface of the reinforcing film 2.

[0086] For the application of the reinforcing threads 2.4, the reinforcing film includes a so-called carrier layer 6. The carrier layer 6 can be an ordinary, thin-film layer made of, for example, polyethylene. If the reinforcing film 2 is to be formed without a metallization layer 4, it would be conceivable to form the carrier layer 6 based on a stronger polymer type variant, for example, based on BOPE, to further increase the strength of the reinforcing film 2. Otherwise, the carrier layer 6 can primarily serve to bond the reinforcing network 2.1 to the metallization layer 4 during a thermolamination process, acting as a kind of bonding layer. The use of any chemicals can be avoided for the sake of environmental friendliness.

[0087] The strength of the reinforcing film 2 is primarily due to the reinforcing network 2.1 and its reinforcing threads 2.4, which are significantly thicker than those of the carrier layer 6. It has now been shown that simply increasing the thickness of the reinforcing network 2.1 at specific points is sufficient to increase the overall strength of the reinforcing film 2. Therefore, it is not necessary to make the entire reinforcing film 2 as thick as the reinforcing threads 2.4 that form the reinforcing network 2.1. In this way, the reinforcing film 2 can be manufactured in a particularly material-friendly manner without any significant loss of strength.

[0088] A further contribution to increasing the strength is made by the alignment of the reinforcing threads 2.4, which will be discussed in more detail below.

[0089] How this Fig. As illustrated in Figure 6, the reinforcing threads 2.4 in the illustrated embodiment run in a total of four different directions, R1 to R4. Along directions R1 and R2, the reinforcing threads 2.4 extend vertically and horizontally across the reinforcing film 2. In contrast, along directions R3 and R4, the reinforcing threads 2.4 run obliquely across the surface of the reinforcing film 2. Due to this large number of differently oriented reinforcing threads 2.4, the propagation of an incipient crack can be stopped regardless of direction.

[0090] To further improve the strength of the reinforcing film 2, individual reinforcing threads 2.4 are segmented in the illustrated embodiment. This segmentation of the reinforcing threads 2.4 allows defects in a single reinforcing thread 2.4 to be localized. In this way, the formation of large-scale defects 14 within the reinforcing film 2 can be prevented.

[0091] The Fig. Figures 7a to 7c illustrate simplified network structures, which are used to explain in more detail the functional orientation of the reinforcing threads in section 2.4.

[0092] To effectively prevent the formation and / or progression of defects 14 on a surface, it is advantageous if the reinforcing threads 2.4 are oriented in at least two different directions R that are essentially perpendicular to each other. For example, if the reinforcing threads 2.4 were to run exclusively parallel, i.e., only along a single direction R, larger, continuous sections of the reinforcing film 2 would result that would not be supported by the reinforcing threads 2.4 and would therefore be susceptible to cracking.

[0093] An exemplary orientation of the reinforcing threads 2.4 in two mutually perpendicular directions R shows the grid-like reinforcing structure 2.2 in Fig. 7a. The reinforcing threads 2.4 run along directions R1 and R2, each perpendicular to the edges of the reinforcing film 2. This results in rectangular, and in particular square, reinforced meshes 2.5. These reinforced meshes 2.5 are characterized by a complete enclosure of reinforcing threads 2.4. For surface damage, such as a tear, to develop into a defect 14 that reduces the level of protection, such a tear must repeatedly penetrate the individual reinforced meshes 2.5. This requires repeatedly overcoming the increased tensile and / or tear strength of the reinforcing network 2.1. The probability of a large-area defect 14 occurring within the reinforcing film 2 is thus significantly reduced.

[0094] Another reinforcement structure 2.3 is in Fig. Figure 7b shows that the reinforcing threads are again oriented essentially perpendicular to each other along directions R3 and R4, but extend obliquely across the surface of the reinforcing foil 2. The coordinate system of the reinforcing structure 2.3 is therefore rotated compared to the coordinate system of the reinforcing structure 2.2. This results in the same advantages as with the previously described reinforcing structure 2.2. As can also be seen, the reinforcing threads 2.4 are spaced apart along direction R4 to further increase strength and are also offset from each other. This gives the reinforcing structure 2.3 a certain asymmetry, which can again have a beneficial effect on preventing cracking or similar problems.

[0095] To maximize strength, the two reinforcement structures 2.2 and 2.3 can be arranged according to Fig. 7c are superimposed, as is implemented in the illustrated embodiments. This results in reinforcing meshes 2.5 of varying sizes and shapes, which are particularly suitable for counteracting the continuous formation of a potential defect 14.

[0096] This orientation of the reinforcing threads 2.4 results in a tensile and tear strength of the reinforcing film 2 that is approximately 20 to 30 times higher compared to a conventional bubble wrap, with a thickness of only D. V The reinforcement network typically achieves a thickness of 130 µm. Including the metallization layer 4, this thickness increases D. V only to about 160 µm. Thus, the reinforcing film 2 is thicker than typical thin-film sections such as the bubble-free spaces of the bubble film 3 with thickness D. B , cf. Fig. 2. However, the thickness D VThe reinforcement film 2 is only increased at specific points due to the structure of the reinforcement network 2.4. This results in a particularly low basis weight of the reinforcement film 2, with a maximum of 60 g / m². 2 including the metallization layer 4, where the reinforcement network 2.4 is responsible for approximately half of this areal weight.

[0097] Based on the Fig. Section 8 below explains in more detail the production of the reinforcing foil 2.

[0098] In the Fig. Figure 8 shows a simplified embodiment of a manufacturing process for producing the reinforcing film 2. This is a particularly cost-effective thermal lamination process, made possible by the standardized production of all film layers of the protective cushioning film 1 using the same polymer type, in particular polyethylene. The manufacturing principle shown, based on thermal lamination, can be applied to the production of the bubble film 3 and thus to the entire protective cushioning film 1.

[0099] In Fig. Figure 8 shows the individual layers of the reinforcing film 2, namely the carrier layer 6, the reinforcing mesh 2.1, and the preferably added metallization layer 4. The individual layers 4, 6, and 2.1 of the reinforcing film 2 move towards each other via the lamination rollers 11 shown, in the directions of movement indicated by arrows, and are thermolaminated in pairs. In the illustrated embodiment, for example, the carrier layer 6 is first bonded to the reinforcing mesh 2.1 via the upper pair of lamination rollers 11. This is preferably followed by lamination with a metallization layer 4, resulting in a metallized reinforcing film 2 with heat-reflective protective properties.

[0100] For a bond-resistant lamination, the individual layers are typically heated to keep the required contact pressure low and thus prevent the formation of pressure-induced defects 14. The thermolamination process can be simplified by using the same polymer type for the carrier layer 6, the reinforcing network 2.1, and the metallization layer 4, despite different polymer variants, as their thermolamination-compatible temperature ranges can be similar. This allows all layers 4, 6, and 2.1 to be bonded together securely at a single temperature, typically in the range of approximately 100 °C to 120 °C, without intermediate steps. If the temperatures for softening layers 4, 6, and 2.1 even overlap, a particularly strong thermal weld can result.

[0101] Sufficiently strong lamination can be achieved simply by softening the carrier layer 6. For this purpose, it can be advantageous if the carrier layer 6 is based on a particularly soft polyethylene variant with a low softening temperature, for example, on LDPE or LLDPE. The softened carrier layer 6 then acts as a kind of adhesive layer into which, for example, the reinforcing mesh 2.1 can be embedded under pressure. The pressure required for a sufficiently strong lamination can therefore be lower, depending on the temperature of the layer to be embedded, and especially when close to its own softening temperature. After cooling, the carrier layer 6 is cured and bonded to the reinforcing mesh 2.1.

[0102] The production of the bubble film 3 is not shown further, but it can be carried out in a similar way by thermolamination of the carrier layer 6 with a dimpled layer with open bubbles 3.1.

[0103] In any case, such thermal lamination processes enable particularly cost-effective production of the different layers, the resulting film layers, and thus the entire protective cushioning film 1. The use of foreign materials, especially chemicals and / or adhesives, can be avoided. In this way, the inherent purity of the protective cushioning film 1, which is often conducive to recycling, can be advantageously maintained.

[0104] In the illustrated embodiments, all layers of the protective cushioning film 1 are based on the polymer polyethylene. Through the combination of different polymer variants and the structural stabilization of the reinforcing network 2.1, the protective cushioning film 1 exhibits significantly higher strength compared to conventional bubble wrap. Furthermore, due to the metallization options and the thermally insulating filler in the bubbles 3.1, the protective cushioning film 1 is also suitable as thermal insulation.

[0105] In summary, the protective cushioning film 1 disclosed above exhibits excellent overall protective properties – both mechanical and thermal – combined with the flexibility typical of films and low basis weight, while maintaining their material purity. Furthermore, its monomaterial composition based on a single polymer type results in cost-effective production and particularly environmentally friendly recycling.

[0106] Despite its increased strength, damage to the protective bubble wrap 1 cannot be completely ruled out, especially over extended periods of use. Instead of discarding a damaged protective bubble wrap 1, a repair option would be preferable from a sustainability perspective.

[0107] One such ecological repair option is the repair tape 12 according to the invention, which, together with a corresponding repair method, utilizes the Fig. 9, Fig. 10, Fig. 11 to Fig. 12 will be explained in more detail below.

[0108] Fig. Figure 9 shows a schematic representation of a repair tape 12 according to the invention.

[0109] The repair tape 12 is designed as a band of reinforcing film 2 and, in the illustrated embodiment, is wound around a roll for unwinding. Alternative designs of the repair tape, such as a patch-like configuration of individual repair tape strips 13 of different sizes and shapes, are also conceivable. The reinforcing film 2 of the repair tape 12 again comprises a carrier layer 6 with a reinforcing network 2.1 to increase strength and preferably with a metallization layer 4, particularly an outer one, and thus essentially corresponds to the reinforcing film 2 of the protective cushioning film 1. Even though the repair tape 12 has a metallization layer 4, it can, in principle, be used to repair a protective cushioning film 1 without a metallization layer 4. For the sake of simplicity, however, the metallization layer 4 is not shown in the present embodiment.

[0110] How this Fig. As illustrated in Figure 11, the repair tape 12 serves to repair protective cushioning films 1 according to the invention. The illustrated protective cushioning film 1 comprises a sandwich-like composition of two end layers 7 designed as reinforcing films 2 and an intermediate layer 8 designed as a bubble film 3 arranged between them. As can also be seen, the protective cushioning film 1 has a crack-like defect 14 on the upper end layer 7. The intermediate layer 7, however, is undamaged.

[0111] Such damage can significantly reduce the protective capacity of the protective cushioning film 1 locally. In some cases, the likelihood of damage to the bubble wrap 3 beneath the damaged area 14 is increased. Depending on the sensitivity of the goods, the entire protective cushioning film 1 would then have to be disposed of and replaced. To avoid such inefficient resource use, the damaged area 14 can instead be covered with a section of the repair tape 12. For this purpose, a strip of repair tape 13 corresponding to the size of the damaged area 14 is cut from the repair tape and then applied to the area of ​​the damaged area 14 of the protective cushioning film 1. The repair tape 12 has an adhesive layer 5 on its underside, which enables a secure bond to the protective cushioning film 1 (see figure). Fig. 10. The gap reducing protection caused by the damaged area 14 is closed, cf. Fig. 12.

[0112] Alternatively, the repair tape 12 can be manufactured perforated, thus determining the size of the repair tape strips. Perforation allows the repair process to be carried out more quickly. However, in this case, a section shaped to fit the damaged area 14 would no longer be possible.

[0113] A durable repair can be carried out using the repair tape as described above, particularly in cases where only the reinforcing layers 7 of the protective bubble wrap 1 are damaged. In all other cases, the defective intermediate layers 7 would also need to be replaced. Otherwise, the protective effect of the protective bubble wrap 1 can only be restored to a certain extent. This can be particularly useful, however, if no fully functional protective bubble wrap 1 and / or intermediate layers 7 are available.

[0114] Even with edge-sealed protective cushion films according to the embodiment shown in Fig. 5. It would be possible to replace the intermediate layers 7 with intact intermediate layers 7 by intentionally opening the seal of the end layers 8. After replacing the defective intermediate layers 7, the preferably minimally invasive opening of the end layers 8 can be resealed using the repair tape. The stability of the intermediate layers 7 against displacement can thus continue to be ensured.

[0115] How this Fig.As also illustrated in Figure 12, the after-effects of the repair are barely visible from the outside. For aesthetic reasons, the repair tape 12 in the illustrated embodiment has a reinforcing film 2 with a reinforcing mesh 2.1, which, with respect to its reinforcing structures 2.2, 2.3, corresponds to the reinforcing mesh 2.1 of the outer layer 7 of the protective bubble wrap 1, which is designed as a reinforcing film 2. Consequently, such a repair tape strip 13 can cover the damaged area 14 so completely that its reinforcing mesh 2.1 and the reinforcing mesh 2.1 of the protective bubble wrap 1 surrounding the damaged area 14 merge into each other as seamlessly as possible with respect to their structures. Furthermore, the repair tape 14 can have a metallization layer 4 if the protective bubble wrap to be repaired is also metallized. This results in successful concealment of the repair process.

[0116] An alternative application, not shown here, is the use of the repair tape 12 according to the invention for fixing the protective cushioning film 1. The protective cushioning film 1 is fixed to the goods and / or a transport pallet, for example, at specific points using several strips of repair tape 13. Otherwise, the protective cushioning film 1 can unintentionally slip during transport of the goods requiring protection, potentially exposing parts of the goods without protection. By fixing the protective cushioning film 1 with the repair tape 12, the protective cushioning film can be securely attached to the goods to prevent slippage.

[0117] Another aspect of the repair tape according to the invention lies in the advantageous preservation of the material purity of the repaired protective cushioning film 1. For this purpose, the reinforcing network 2.1 and the carrier layer 6 of the repair tape 12 are based on the same polymer type as the protective cushioning film 1, in particular on polyethylene. Repairing the protective cushioning film 1 with such a repair tape therefore does not lead to any contamination of the monomaterial structure of the protective cushioning film 1. Even after the repair, environmentally friendly recycling is still possible without the need to remove the repair tape strips 13 from the protective cushioning film 1.

[0118] The repair tape 12 described above enables a satisfactory repair and / or fixation of the protective cushioning film 1 while maintaining the advantageous purity of the material. Reference symbol: 1 protective bubble wrap 1.1 Protective bubble wrap 1.2 Protective bubble wrap 1.3 Protective bubble wrap 2 Reinforcing foil 2.1 Reinforcement network 2.2 Reinforcement structure 2.3 Reinforcement structure 2.4 Reinforcing thread 2.5 Reinforcement stitch 3 bubble wrap 3.1 Bubbles 4 Metallization layer 5 adhesive layers 6 Carrier layer 7 Final situation 8 Intermediate layer 9 Thermal insulating gas 10 Device for producing bubble film 11 Laminating roller 12 Repair tape 13 repair tape strips 14 Damage point 15 items 16 Source of danger Thickness D V Reinforcing foil, thickness D B Bubble wrap, thickness R direction R1 direction R2 direction R3 direction R4 direction QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2020 / 141376 A1

[0005]

Claims

. Protective cushioning film as, in particular, thermally insulating, packaging protection with at least one layer of a bubble film (3) with bubbles (3.1), characterized by at least one layer of a reinforcing film (2) which has a reinforcing network (2.1) to increase the strength, wherein the bubble film (3) and the reinforcing film (2) are based on the same type of polymer, in particular polyethylene. Protective cushioning film according to claim 1, characterized in that the reinforcing film (2) is multilayered, wherein the reinforcing mesh (2.1) forms one of the layers. Protective bubble wrap according to claim 2, characterized in that the reinforcing film (2) has a metallization layer (4) for heat reflection. Protective bubble wrap according to claim 2 or 3, characterized in that the reinforcing film (2) has a carrier layer (6). Protective cushioning film according to claim 4, characterized in that the reinforcing network (2.1) and / or the metallization layer (4) and / or the carrier layer (6) are based on the same polymer type, in particular polyethylene. Protective cushioning film according to claim 5, characterized in that the polymer type of the reinforcing network (2.1) is based on a different polymer type variant than the polymer type of the metallization layer (4) and / or the polymer type of the carrier layer (6). Protective bubble wrap according to one of the preceding claims, characterized by at least one end layer (7) designed as a reinforcing film (2). Protective bubble wrap according to claim 7, characterized by two end layers (7) between which at least one intermediate layer (8) designed as a bubble wrap film (3) is arranged. Protective bubble wrap according to claim 8, characterized in that several intermediate layers (8) are arranged in a stacked manner between the final layers (7). Protective bubble wrap according to one of the preceding claims, characterized by reinforcing threads (2.4) forming the reinforcing network (2.1). Protective cushioning film according to claim 10, characterized in that the reinforcing threads (2.4) are aligned along the surface of the reinforcing film (2) in at least two different, preferably at least three different and particularly preferably at least four different directions (R). Protective bubble wrap according to one of the preceding claims, characterized in that the bubbles are filled with a thermal insulating gas, preferably with an air-noble gas mixture, in particular with argon, to increase the thermal insulation. Repair tape for repairing a protective bubble wrap film (1) according to one of the preceding claims, wherein the repair tape is designed as a, in particular unwindable, tape reinforcement film (2) with a reinforcement network (2.1), with a carrier layer (6) and with an adhesive layer (5) for adhesive bonding to the protective bubble wrap film (1), wherein the reinforcement network (2.1) and the carrier layer (6) are based on the same type of polymer, in particular polyethylene.

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