Method for producing a separable packaging container, and separable packaging container

Abstract

The invention relates to a separable packaging container and to a method for producing a separable packaging container, wherein the method has the following steps: - forming a fibrous material container (1); and - applying a film (2) to the fibrous material container (1). In order to apply the film (2), the fibrous material container (1) is introduced into a receiving area (3) of a tool (4), the receiving area being shaped so as to complement the contour of the fibrous material container (1), the film (2) is sealingly stretched over an opening (5) of the receiving area (3), and the film (2) is then pressed into the receiving area (3) by means of a positive pressure such that the film (2) covers the wall (9) of the fibrous material container (1). The aim of the invention is to provide a rapid and technically simple method for producing a separable packaging container and to provide a packaging container that can be separated if necessary. This is achieved in that, first, the wall (9) of the fibrous material container (1) is coated with a coating (6) at least in some parts and then the film (2) is applied, the film (2) being applied to the coating (6) and the coating being designed in such a way that the film (2) releasably adheres to the coating.

Description

METHOD FOR MANUFACTURING A SEALABLE PACKAGING CONTAINER AND SEALABLE PACKAGING CONTAINER Technical field

[0001] The invention relates to a method for producing a separable packaging container according to the preamble of claim 1, in which a fibrous container is formed and a film is applied to the fibrous container. The invention further relates to a separable packaging container according to the preamble of claim 7.

[0002] Fibre packaging is enjoying increasing popularity. Fibre – also known as pulp – is a quantity of fibers, often derived from wood pulp, which can be formed into a wide variety of shapes. Fibre is a widely used material that is highly recyclable. Components of renewable raw materials and / or recycled components of pulp-containing materials, such as wood or paper, are particularly suitable for the production of fibrous packaging. The fibrous material is processed, for example, using the fiber casting process. In this process, the aforementioned raw materials are mixed with water to form an aqueous pulp (also called "fiber slurry" or "fiber dispersion"), from which the fibers are formed into a molded fibrous body, and in particular, a fibrous container. For this purpose, the pulp can be drawn into a suction mold.In this process, water is drawn out through pores in the suction mold, and the fibers are deposited on the porous surface of the mold. The fiber content increases and compacts during the suction process. After a specific suction duration, the fiber-fluid mixture is drawn into the mold, compacting it into a layer of fiber, and a fiber-molded body with the desired contour and wall thickness is formed. If necessary, the fiber-molded body is reshaped (pressed) and dried after demolding. Other processing methods are also known, such as fiber compression molding, in which a pulp is introduced into a first molded part, and this pulp is then shaped, compacted, and dewatered by pressing a second molded part into the first.

[0003] Fibrous packaging is particularly environmentally friendly because it is highly recyclable and biodegradable. If fibrous packaging is additionally coated, as is known, for example, from DE 10 2019 110 593 A1, it can be highly gas- and watertight and used as packaging for food products made primarily from natural raw materials.

[0004] For some packaging applications, special barrier layers are required or advantageous, particularly those not made exclusively from natural raw materials. For example, packaging containers for drugstore and cosmetic products often use films with low permeability to liquid and / or gas molecules, thus ensuring a long shelf life for these products. However, these films are not biodegradable. Approaches exist to improve the sustainability of such packaging containers.

[0005] From EP 4 306 441 A1, for example, a recyclable packaging tube is known. The packaging tube has a receiving container for the direct storage of a substance to be packaged or stored and at least one molded body to provide mechanical, static, and / or dynamic stability to the packaging tube. The molded body consists of a recyclable material, for example, a fiber-containing material, and the receiving container of a material adapted to the substance to be packaged. A separable connection is formed between the molded body and the receiving container or a component of the packaging tube connected to the receiving container. This separable connection is designed such that, during intended use of the packaging tube, the connection remains intact and that a manual and / or tool-free irreversible separation of the separable connection, in particular by cracking, is possible.EP 4 306 441 A1 does not disclose the manufacturing process of the packaging tube.

[0006] Furthermore, WO 2022 / 053879 A1 discloses a packaging component, for example a tube, which comprises a structural component and at least one functional component. The structural component has a high cellulose content and the functional component a low cellulose content. The two components are firmly bonded together, resulting in poor separability and / or reduced purity in the recycling process.

[0007] US Patent 7,370,788 B1 describes a bottle-shaped container with a film applied to its inner wall and a coating applied to its outer wall. US Patent 2013 / 0206,755 A1 describes containers that may be coated with multilayer films. CN Patent 114,351,511 A describes a bottle-shaped container with a film bonded to its inner surface. Further containers are described in patents US Patent 2010 / 0044,267 A1, WO Patent 2024 / 163,097 A1, US Patent 2022 / 0274,367 A1, EP Patent 2338,807 A1, US Patent 11,926,967 B2, and US Patent 5,738,921 A.

[0008] The invention is based on the objective of providing a fast and technically simple method for manufacturing a separable packaging container, as well as a packaging container that can be separable as needed. In particular, the method should enable the production of a sustainable packaging container designed in such a way that the components of the packaging container can be easily separated from one another and thus disposed of or recycled in a sorted manner.

[0009] This problem is solved by a method and a packaging container comprising all the features of the independent claims. Advantageous embodiments are described in the dependent claims.

[0010] The process described here includes the following steps: forming a fiber container and attaching a film to the fiber container.

[0011] The formation of the fiber container can be carried out in particular in the known manner described at the beginning using the fiber casting process.

[0012] To solve the above problem, the method involves inserting the fiber container into a recess in a tool whose contour is complementary to the fiber container's shape. The film is then stretched tightly over an opening in the recess, and subsequently pressed into the recess by overpressure, so that the film coats the wall of the fiber container. In other words, applying the film to the fiber container comprises several steps. The fiber container is inserted into the recess, for example, a cavity or chamber, of the tool such that the side of the wall to be coated faces an opening in the recess. The side of the fiber container facing away from the opening rests against a wall of the recess that is complementary to the contour of the fiber container.In this way, this wall supports the fiber container during the application of the film. The opening can be covered with the film, particularly after the fiber container has been inserted, in such a way that the opening and the receptacle are essentially airtight. A pressure difference is then created between the area outside the receptacle, especially above the film-covered opening, and the area inside the receptacle, resulting in overpressure in the area of ​​the opening. This overpressure presses the film against the fiber container within the receptacle. When air is extracted from the airtight receptacle using a suction device connected to the tool, the resulting negative pressure draws the film into the receptacle, causing the film to deform and conform to the side of the fiber container facing the opening. Alternatively, the opening of the receptacle can be connected to a compressed air source.The tensioning and suction or pressing of the film is technically very simple and enables the rapid production of a high-quality container. In particular, the film can line the inside of the fiber container wall virtually wrinkle-free. The film can also laminate the wall of the fiber container.

[0013] The films used in the process described here are deformable during suction. For this process, the film can be made of any biocompatible material and have any thickness, as long as it remains deformable during suction. Materials are defined as those that do not have a negative impact on living organisms in their environment. In particular, the film can be made of a biodegradable material. However, the process also specifically allows the use of a film that is not biodegradable.

[0014] Using a non-biodegradable material for the film can be particularly advantageous with regard to the required tightness of the packaging container. Nevertheless, optimal disposal is ensured with this packaging container, as the film can be easily separated from the fibrous container and then disposed of or recycled separately. This separate disposal option is especially beneficial for packaging of products that must be disposed of properly as special waste (such as drugstore or cosmetic products). Products that must be disposed of properly as special waste, and especially drugstore or cosmetic products, often require packaging with specially adapted barrier layers to ensure a long product shelf life.The adapted barrier layers are currently mostly made of non-biodegradable materials. As known from the aforementioned EP 4 306 441 A1, they can be arranged in the form of a bag made of film inside a mechanically stable container and come into direct contact with the products that must be disposed of properly as separate waste.

[0015] If the products that come into contact with the film must be disposed of as separate waste and separating these products from the film is technically complex, it may be advantageous to dispose of the film, which in the current state of the art is usually made of non-biodegradable materials, together with the products as separate waste. In this case, it may also be beneficial to be able to separate the film, which is specifically optimized for product shelf life, from the other components of the container in which the products are packaged, in order to reduce the amount of separate waste. With the separable packaging container described here, the film can be detached from the fibrous wall of the container manually.Pressing or suctioning the film into the fiber container causes it to adhere tightly to the container wall, but does not create a bonded connection. This allows the film to be easily removed from the fiber material by hand with minimal force. After the packaging container is opened, the film, which may be made of materials such as polylactic acid (PLA), polystyrene (PS), and / or polyethylene (PE), can be disposed of separately along with the products it contained. The biodegradable fiber container can be disposed of with organic waste or recycled. This effectively reduces the amount of waste generated and achieves a high recycling rate after its intended use.

[0016] During the manufacturing process of the packaging container, the film can be pressed or suctioned, particularly with a pressure differential of 0.01 bar to 0.9 bar. Preferably, the pressing / suctioning is carried out with a pressure differential of 0.5 bar to 0.9 bar, and more preferably with a pressure differential of 0.8 bar.

[0017] To create a tight seal by clamping the film over the opening of the holder, the film can be clamped, in particular, in a clamping device arranged on the tool. The clamping device can have a plurality of clamping jaws arranged around the circumference of the opening, into which the film is clamped. Alternatively, the clamping device can be designed as a hold-down device that presses the film, stretched over the opening, against the tool.

[0018] In practice, the wall of the fiber container can be coated, at least in sections. The coating can be designed to reduce the porosity of the container material. This coating can increase the container's resistance to moisture and / or its gas tightness.

[0019] The coating is designed so that the film adheres to it detachably. To ensure this detachable adhesion, the coating can be applied to the areas of the fiber container wall where the film is intended to be in contact. Specifically, the coating can be applied across the entire surface of these areas. Alternatively, the coating can be applied only locally within these areas, thus increasing the adhesive strength between the film and the fiber container only in those specific locations. This facilitates the manual removal of the film from the fiber container.

[0020] In practice, the coating can be a polymer solution containing inorganic pigments. The polymer solution can be, in particular, a free-flowing, water-based solution containing both polymers and the inorganic pigments. The free-flowing polymer solution can be applied, for example, by filling the fiber container with the solution and then pouring it out, leaving some of the solution on the container wall. Alternatively or additionally, the fiber container can be immersed in a bath containing the polymer solution and then removed, leaving some of the solution on the container wall. Again, additionally or alternatively, the polymer solution can be sprayed onto the container wall.If the coating is only to be applied locally to the wall, the areas of the wall not to be coated can be masked with a masking material before the polymer solution is applied, which is then removed after the coating has been applied.

[0021] The polymers contained in the polymer solution serve primarily as a carrier material for the inorganic pigments. The polymers in the polymer solution are primarily biodegradable biopolymers, such as polysaccharides.

[0022] By applying the coating in the form of a polymer solution containing inorganic pigments and subsequently drying the polymer solution, it is possible to form a coating in which the inorganic pigments remain arranged on the wall of the fiber container in a scale-like manner. The pigments cover the wall of the fiber container and thus increase its resistance to moisture and / or gas tightness.

[0023] Optionally, the fiber container can be rotated with the flowable polymer solution, whereby the part of the polymer solution remaining on the wall forms a uniform layer thickness and excess polymer solution is removed particularly effectively.

[0024] Optionally, the fiber container can be heat-treated with the polymer solution. This can, for example, impart particularly desirable properties to the polymer solution. Specifically, the fiber container can be dried with the polymer solution in an oven, whereby the water is removed from the polymer solution very quickly, and the polymer solution dries to form the coating. Furthermore, the heat treatment can positively modify the properties of the fibers in the fiber container, the polymers, and / or the inorganic pigments.

[0025] The aforementioned steps for applying the coating can be carried out repeatedly, particularly several times in succession. In this way, a coating with predefined properties and a high layer thickness can be created.

[0026] In practice, the coating can be applied first, followed by the film, using the method described here. This ensures that the coating application step does not affect the film. As a result, the film can retain the properties necessary for the long-term durability of the products it encapsulates particularly well.

[0027] If the coating is applied first and then the film, the film can be applied directly onto the coating. In other words, the film at least partially covers the coating. This overlap can be particularly advantageous if the coating is designed to improve adhesion of the film and / or its separability from the fiber container.

[0028] In practice, the film and / or coating can be applied to the inside of the fiber container. The inside is the surface of the fiber container facing the interior. If the coating facilitates the adhesion and / or separation of the film from the fiber container, it is particularly advantageous to apply the coating to the inside of the fiber container and to attach the film to the coating on the inside. This allows the film to be removed from the fiber container with particular ease in the packaging described here. Furthermore, the film provides ideal protection for a product contained within the packaging container, especially a drugstore or cosmetic product, and the coating provides ideal protection for the fiber container from moisture from the drugstore or cosmetic product inside.

[0029] The invention described here is not limited to the aforementioned arrangement of the film and the coating on the inner wall of the fiber container. Alternatively, the film can be applied to the inner surface of the fiber container without the packaging container having a coating. This provides excellent protection for the product contained within. Alternatively, the film can be applied directly to the inner surface of the fiber container, and the coating applied to the outer surface. The outer surface is the surface of the fiber container facing away from the interior. Applying the coating to the outer surface of the fiber container protects it from ambient moisture.Furthermore, the product contained in the packaging container is protected by the film applied to the inside. Alternatively, the film can be applied to the outside of the fiber container and the coating to the inside. This also provides lasting protection for the product contained in the packaging container.

[0030] In the method described here, the film stretched over the opening of the holder can be heated in practice. For this purpose, a heating element, in particular a heating plate, can be brought close to the side of the film facing away from the opening, thus heating the film. When the film is pressed against the tool with the holder by means of a hold-down device, the hold-down device itself can have a heating element that heats the film. The film can be heated, in particular, to a temperature of 70°C to 120°C, preferably to a temperature of 90°C to 110°C, and more preferably to a temperature of 100°C. When the film is heated, it can be drawn in more easily.

[0031] In particular, if, as described in this application, the coating is applied first and then the film, it may be advantageous not to exceed the aforementioned temperatures when heating the film, so that the coating is not undesirably affected by the heating.

[0032] In practice, the film can be made of a thermoplastic material, particularly a thermoplastic polymer such as polylactic acid (PLA), polystyrene (PS), and / or polyethylene (PE). In this case, the film may become plastically deformable when heated, especially to the aforementioned temperatures. The film can then be plastically deformed during insertion or suction, allowing it to easily come into contact with the wall of the fiber container. Heating of the film can be stopped during or after suction. The film can then be passively cooled or actively cooled until it is no longer plastically deformable.Heating the film and its plastic deformability allow for the formation of at least a localized bond between the film and individual fibers of the fiber container and / or individual pigments of the coating. This bond can be particularly form-fit, for example, by the film material partially encasing the fibers and / or pigments. Since a large number of such bonds can be formed, a strong adhesion between the film and the fiber container can be achieved, which, however, can be easily separated again if necessary.

[0033] In practice, the coating can be a first coating, and a second coating can be applied, at least in certain sections. The first coating can be applied, in particular, in the form of a polymer solution containing inorganic pigments. The second coating can provide an additional barrier and further increase the gas tightness of the packaging container. For example, the second coating can contain at least one of the following components: linseed oil; carnauba wax; beeswax; shellac; sugar cane wax.

[0034] It is particularly possible to apply the second coating in a flowable form. For this purpose, the material from which the second coating is formed can be heated. In this context, reference is also made to the methods for applying the flowable coating described in connection with the first coating.

[0035] The second coating can be applied, in particular, after the first coating and before the film. Preferably, the second coating is applied over the first coating, and the film is applied over the second coating. However, it is also possible to apply the second coating to a side of the fiber container that faces away from the side with the first coating.

[0036] The second coating can also have a separating effect. While the open pores of the fiber container often lead to strong adhesion of the film to the surface of the fiber container, oils and waxes in particular can cause the film to adhere to the fiber container with low adhesive strength and be easily separated from it.

[0037] The invention also relates to a separable packaging container comprising a fiber container, a film, and a coating, wherein the coating is applied at least partially to a wall of the fiber container. In the packaging container, the film is detachably attached to the fiber container and / or the coating. Preferably, the film is attached to the coating and, more preferably, is detachably connected to it. More preferably, the coating and the film can be arranged on an inner surface of the fiber container. The coating can serve, firstly, as a barrier against moisture and to increase gas tightness. Secondly, the coating can serve as a kind of release layer, allowing the film to be easily detached from the fiber container as needed.This packaging container allows for the long-lasting storage of a product contained within, particularly a drugstore and / or cosmetic product. Furthermore, due to its separable nature, the packaging container generates only a small amount of waste after use and achieves a high recycling rate of the raw materials used.

[0038] With regard to the separable packaging container, reference is also made to the description of the manufacturing process. The features and advantages disclosed therein are transferable to the packaging container by analogy.

[0039] In practice, the film can lie completely flat against the coating of the packaging container. In other words, the coating can be applied across the entire surface between the areas of the fiber container wall where the film is intended and the film itself.

[0040] In practice, the film can be made of polyethylene (PE), polystyrene (PS), and / or polylactic acid (PLA). These materials have particularly good properties for increasing the shelf life of drugstore and / or cosmetic products in a packaging container.

[0041] In practice, the coating can consist essentially of inorganic pigments and polymers. The polymers can be, in particular, biodegradable biopolymers. The pigments can be, in particular, in the form of flat platelets and at least partially overlap each other within the coating. The pigments are thus arranged essentially in a scale-like structure, similar to the scale structure on fish skin. The pigments can be arranged randomly, so that not every pigment at least partially overlaps another pigment, nor is every pigment at least partially overlapped. Rather, the coating can have individual gaps. To minimize the size and frequency of such gaps, the coating application process, as described, can be repeated.

[0042] In practice, with this packaging ratio, a second coating may be applied to at least part of the wall of the fiber container, and this second coating may contain at least one of the following components: linseed oil; carnauba wax; beeswax; shellac; sugar cane wax.

[0043] Regarding the other features and advantages associated with the second coating, reference is also made to the corresponding description in the context of the manufacturing process.

[0044] Further practical embodiments and advantages of the invention are described below in connection with the drawings.

[0045] shows a schematic flowchart of the manufacturing process described here.

[0046] shows a schematic representation of a device for attaching a film to the fiber container during the application of the film in a cutaway side view.

[0047] Figure 1 shows a schematic representation of the fiber container described here in a first embodiment in a cutaway side view.

[0048] In the figures, matching reference symbols in different figures denote identical or functionally equivalent technical elements or process steps. For clarity, not all reference symbols are included in the figures, although the elements may still be present.

[0049] In the process illustrated by the flowchart shown in Figure 1, a fiber container is first produced in a known way using the fiber casting process in a first process step A.

[0050] In the fiber casting process, water and cellulose are mixed in a mixing tank to form a pulp suitable for producing fiber-based molded bodies, particularly fiber containers. The pulp is conveyed through pipes to an immersion tank, above which a suction mold is positioned and can be raised and lowered. The suction mold has a surface whose contours are complementary to the shape of the fiber container being produced. The suction mold can be lowered into a suction position below the liquid level of the pulp and raised into a discharge position above the liquid level of the pulp.

[0051] The suction mold, as is known, has a porous surface, which can be formed, for example, by a sieve-like metal mesh or by a porous material. Water is drawn in through this porous surface, causing fiber material to be deposited on it. After a certain suction time, during which the desired layer thickness of fiber material has been deposited on the surface, the suction process is stopped and the suction mold is lifted out of the pulp. The resulting, still-wet fiber container can then be removed from the suction mold, for example, using a transfer mold. The still-wet fiber container is then dried to produce the finished fiber container, for example, in the transfer mold or on a conveyor belt in an oven.

[0052] In a second process step B, a coating is applied to the finished fiber container. The coating, in the form of a free-flowing, water-based polymer solution containing inorganic pigments, is applied to the container wall. The polymers are biodegradable biopolymers, such as polysaccharides.

[0053] The coating can be applied, for example, to the inside of the fiber container. To do this, the free-flowing polymer solution is poured into the fiber container until it is completely filled. The polymer solution is then poured out, leaving some on the container wall. The container is then rotated, allowing the remaining polymer solution to form a uniform layer and removing any excess. The container is then transferred, for example, using the aforementioned transfer device, to an oven and heated. This causes the water in the polymer solution to evaporate, and the polymer solution, along with the inorganic pigments, dries to form the coating.The dry coating then consists essentially of the inorganic pigments and the biodegradable biopolymers, with the pigments partially overlapping each other in a scale-like fashion. The coating can be applied several times in succession, if necessary, to achieve a sufficiently thick layer.

[0054] In a third process step, C, a film is applied to the coated fiber container. Process step C comprises several sub-steps, which in this example are designated as steps C1, C2, C3, and C4. The principle of applying the film is also shown schematically in Figure 2, which is described here together with Figure 1.

[0055] In the first step C1, to apply the film 2 to the coated fiber container 1, the fiber container 1 is inserted into a receptacle 3 of a tool 4 shown in Figure 2. The fiber container 1 can be inserted, for example, using the aforementioned transfer mold. However, the tool 4 can also be the suction mold, meaning the coating can be applied directly in the suction mold. The receptacle 3 is essentially complementary to the contour of the fiber container 1. It has an opening 5 through which the fiber container 1 is inserted such that, when inserted, the side of the fiber container 1 to be coated with the film 2 points towards the opening 5.In the example shown in Figure 2, the film 2 is to be attached to the inside of the fiber container 1, onto which the coating 6 has already been applied. Therefore, when inserted, the fiber container 1 rests with its outside against the wall of the receptacle 3, and the inside is accessible from the opening 5. If the film 2 is to be applied to the outside of the fiber container 1, the fiber container 1 can be inserted analogously into a receptacle (not shown in the figures) that is complementary to the inside of the fiber container 1. In this case, the outside is oriented towards an opening of the adapted receptacle and is freely accessible from there.

[0056] In the second step, C2, the film 2 is stretched tightly over the opening 5 of the receptacle 3. For this purpose, in the example described here, the film 2 is clamped in a plurality of clamping jaws 7, as shown in Figure 2, which are arranged next to the opening 5. The clamping jaws 7 can be arranged around the opening 5, in particular at equidistant intervals from each other. In the sectional view of Figure 2, only two clamping jaws 7 are shown, but more than two, for example six or eight clamping jaws 7, can be provided.

[0057] The arrangement of the film 2 over the opening 3, not shown in the figures, can be achieved, for example, by stretching a film web over the side of the tool 4 that has the opening 3, then using a punching device to punch out a piece of film over the opening 3 from the film web, pressing the edges of the film piece into the clamping jaws 7. Alternatively, a pre-cut or pre-punched piece of film can be transferred over the opening 3 using a transfer device and clamped there in the clamping jaws 7. The transfer device can, for example, suction the film piece during the transfer and blow it out to position it against the clamping jaws 7. As an alternative to the clamping jaws 7, a hold-down device can also be provided, which presses the film 2, in the form of the film web or film piece, against the tool 4 over the opening 3.

[0058] In the third step C3, a heating element 8, which in the example described here is designed as a heating plate, is brought from above towards the clamped film 2, as shown in Figure 2 by arrow P1. The heating element 8 is activated and thus heats the film 2 to a temperature of, for example, 100°C.

[0059] In the fourth step, C4, the heated film 2 is drawn into the receptacle 3, so that the heated film 2 lines the wall 9 of the fiber container 1. In the example described here, the inner surface of the wall 9 of the fiber container 1 is coated with the film 2. For this purpose, the atmosphere is extracted from the receptacle 3, which is essentially airtight sealed with the film 2, through flow channels 10, as shown in Figure 2 by arrows P2. The flow channels 10 can be incorporated into the tool 4, particularly on a side opposite the opening 5, and are connected to a suction device, for example a pump (not shown), allowing fluid to flow through them. When the atmosphere is extracted from the sealed receptacle 3, a negative pressure of, for example, 0.8 bar is created in the receptacle 3.This causes the heated film 2 to be drawn through the opening 5 into the receptacle 3, whereby the heated film 2 deforms from its taut state, conforms to the contour of the wall 9 on the inside of the fiber container 1, and comes into contact with this wall 9 or the coating 6 arranged on this wall. Due to the heating during the suction process, the film 2 can be plastically deformed, in particular, and cover the fiber container essentially without wrinkles. Furthermore, the heated film 2 can form locally formed, positive-locking connections with the adjacent wall 9 or the adjacent coating 6, which can be easily separated again if necessary. After the film 2 is positioned against the wall 9, the heating element 8 is removed or deactivated. The film 2 cools down again and subsequently retains its shape.

[0060] In an alternative embodiment, the heating element 8 can also be pressed tightly against the film 2 and have a compressed air channel (not shown) through which compressed air is supplied to the area between the heating element 8 and the film 2. The compressed air generates the overpressure acting on the film 2 relative to the ambient pressure, which presses the film 2 into the fiber container 1.

[0061] In a final step D, the packaging container is removed from the receptacle 3 and can then be used or further processed, e.g. by attaching a lid.

[0062] Optionally, the process can also include the application of a second coating of linseed oil, carnauba wax, beeswax, shellac, and / or sugar cane wax (not shown). The second coating is applied, for example, after the first coating and before the foil is applied to the first coating.

[0063] Figure 3 shows an embodiment of the packaging container described herein, which is produced, for example, by the method described in this application. The embodiment of the packaging container shown in Figure 3 comprises a fibrous container 1', a film 2', and a coating 6'. The film 2' consists, in particular, of polylactic acid (PLA), polystyrene (PS), and / or polyethylene (PE). The coating 6' consists essentially of inorganic pigments and biodegradable biopolymers, the pigments partially overlapping one another in a scale-like manner.

[0064] The film 2' is provided on the inside of the fiber container 1' and is essentially wrinkle-free. The coating 6' is applied over its entire surface to a wall 9' of the fiber container 1', wherein, in the embodiment shown in Figure 3, the coating 6' is applied to the inside of the fiber container 1' on the wall 9'.

[0065] Due to the arrangement of the coating 6' on the inside of the fiber container 1' shown in Figure 3, the film 2' lies directly against the coating 6' and indirectly against the wall 9' of the fiber container 1'. In this case, the film 2' is detachably bonded to the coating 6'. This allows the film 2' to be easily removed from the fiber container 1'. Furthermore, the film 2' provides ideal protection for a product contained in the packaging container, particularly a drugstore or cosmetic product, and the coating 6' ideally protects the fiber container 1' from moisture from the drugstore or cosmetic product contained within. The packaging container described in Figure 3 can be manufactured, in particular, using the method shown in Figures 1 and 2 and described above.

[0066] Of course, it is also possible to arrange the coating and the film on the outside of the fiber container (not shown).

[0067] Furthermore, the packaging container may have a second coating of linseed oil, carnauba wax, beeswax, shellac, and / or sugar cane wax (not shown), particularly between the first coating and the film or between the fiber container and the film. This second coating essentially serves to further improve the gas tightness of the packaging container.

[0068] The features of the invention disclosed in this description, in the drawings, and in the claims can be essential for realizing the invention in its various embodiments, both individually and in any combination. The invention is not limited to the described embodiments. It can be varied within the scope of the claims and taking into account the knowledge of the person skilled in the art.

[0069] 1, 1' Fiber container 2, 2' Film 3 Holder 4 Tool 5 Opening 6, 6' Coating 7 Clamping jaws 8 Heating element 9, 9' Fiber container wall 10 Flow channels P1 Arrow P2 Arrow A Step B Step C Step C1 Substep C2 Substep C3 Substep C4 Substep D Step

Claims

A method for producing a separable packaging container, the method comprising the following steps: forming a fiber container (1, 1') and applying a film (2, 2') to the fiber container (1, 1'), wherein, for applying the film (2, 2'), the fiber container (1, 1') is placed into a receptacle (3) of a tool (4) shaped complementary to the contour of the fiber container (1, 1'), the film (2, 2') is stretched sealingly over an opening (5) of the receptacle (3), and subsequently the film (2, 2') is pressed into the receptacle (3) by an overpressure, so that the film (2, 2') covers a wall (9, 9') of the fiber container (1, 1'), characterized in that, first, the wall (9, 9') of the fiber container (1, 1') is coated at least section by section with a coating (6, 6') is coated and then the film (2, 2') is applied, the film (2, 2') being applied to the coating (6,6') is applied and wherein the coating is designed such that the film (2, 2') adheres detachably to the coating. Method according to claim 1, characterized in that the coating (6, 6', 6'') is applied in the form of a polymer solution comprising inorganic pigments. Method according to one of claims 1 and 2, characterized in that the film (2, 2', 2'') and the coating (6, 6') are applied to an inner side of the fiber container (1, 1') on the wall (9, 9'). Method according to one of claims 1 to 3, characterized in that the film (2, 2', 2'') stretched over the opening (5) of the receptacle (3) is heated. Method according to one of the preceding claims, characterized in that a second coating is applied at least section by section. Method according to claim 5, characterized in that the second coating is applied after the first coating (6, 6', 6'') and in front of the film (2, 2', 2''). Separable packaging container comprising a fiber container (1, 1', 1''), a film (2, 2') and a coating (6, 6'), wherein the coating (6, 6') is applied at least section by section to a wall (9, 9') of the fiber container (1, 1', 1''), characterized in that the film (2, 2') is applied to the coating (6, 6') and the coating is designed such that the film (2, 2') is detachably attached to the coating (6, 6'). Packaging container according to the preceding claim, characterized in that the film (2, 2') lies flat against the coating (6, 6'). Packaging container according to one of the preceding claims 7 or 8, characterized in that the film (2, 2', 2'') is formed from polyethylene, polystyrene, and / or polylactides. Packaging container according to one of the preceding claims 7 to 9, characterized in that the coating (6, 6', 6'') comprises inorganic pigments and polymers. Packaging container according to one of the preceding claims 7 to 10, characterized in that a second coating is applied at least sectionally to a wall (9, 9', 9'') of the fiber container (9, 9', 9'') and this second coating contains at least one of the following components: linseed oil; carnauba wax; beeswax; shellac; sugar cane wax.

Images