Method and device for forming and coating fibre-containing containers

Abstract

The present invention relates to a method of forming and coating a fibre-containing (in particular pulp-containing) container, where the method comprises: forming a fibre-containing (in particular pulp-containing) container, the container comprising an opening (3), where the container is provided in a mould, and in particular is formed around a coating bubble; or forming a fibre-containing (in particular pulp-containing) container element, the container element comprising an opening, in which the container element is provided in the mould, and in particular formed around the coating bubble; forming a coating bubble, the coating bubble being arranged at least temporarily and / or partially in the container or the container element; pressurizing the coating bubble with a pressure medium of a pressure source so as to expand the coating bubble, so that the coating bubble at least partially bears against the inner wall of the container or the container element and optionally at least partially compresses the wall thickness of the container; and separating the coating bubble from the pressure source while the coating bubble remains at least partially in the container or the container element as a container coating. The invention further relates to a device.

Description

Technical Field

[0001] The present invention relates to a method and apparatus for forming and coating fiber-containing containers. Background Art

[0002] In the prior art, it is known to use air bubbles in the drying step of a wet molded body made of pulp to maintain the shape of the molded body and flatten it. This is usually done in the drying step to minimize the shrinkage of the pulp container during the drying process.

[0003] The inner wall of the pulp container is then coated in order to minimize the impermeability of the container and the permeability to gases and water vapor. In order to improve the processability of the coating material, the coating material is usually sprayed onto the inner wall of the pulp container at a temperature of more than 100° C. A disadvantage of this method according to the prior art is that the gas bubble is pressurized against the inside of the container during or before drying and must be depressurized again before it can be pulled out of the container. In addition, a specific gas bubble must be provided for each model, which complicates format changeovers.

[0004] The next step is to apply the coating to the inner wall of the pulp container, for which at least the coating material is heated.

[0005] Pulling out air bubbles, heating the container coating and spraying the coating material on the inside all add to the energy and time required to manufacture the pulp container. Summary of the invention

[0006] On this basis, the object of the present invention is to provide a method and a device for forming and coating fiber-containing containers, which method / device enables the production of fiber-containing containers in a more efficient manner in terms of time and energy compared to the prior art.

[0007] This object is achieved by the method according to the invention.

[0008] In the following the term "container" refers both to the complete container and to a plurality of individual container elements.

[0009] The fibers are in particular at least partially plant fibers, such as cellulose. The pulp may comprise a suspension of water and fibers. The fibers may comprise lignin, banana leaves, quinine, glass fibers, metal wires, cellulose fibers, hemp, sisal, flax, silica gel, wheat and / or surgical thread. The fibers may, for example, comprise fibers of conifers, leafy shrubs and / or sycamores, and / or fibers of grasses, reeds and / or bamboos, etc. Lignin may support the slurry and is also suitable for transparent purposes. Banana leaves are suitable for larger containers, such as disposable tableware. Strength may be improved by embedding glass fibers, metal wires and / or surgical thread.

[0010] With this method, the coating bubble remains in the container as a coating on the inner wall of the container after the container has been formed, in particular after the container wall has been flattened and compressed. This eliminates the need to release excess pressure and subsequently to pull the bubble out after the forming step and to carry out an additional coating step. The coating bubble thus has a dual role, and the forming and coating processes can take place simultaneously. This allows the method for producing fiber-containing containers to be carried out in a more time-saving and energy-efficient manner.

[0011] In another embodiment, the method may further include: increasing the temperature of at least one area of ​​the container and at least one area of ​​the coating bubble, thereby at least partially drying the container and making the coating bubble at least partially conform to the container, and optionally at least partially connecting the coating bubble to the inner wall of the container.

[0012] Since the coating bubble is used both for forming and coating in the container, the container and the coating bubble can be heated together to dry the container and bring the coating bubble to processing temperature. This saves energy and time when manufacturing coated containers because the heating required for drying and coating can be combined.

[0013] Furthermore, due to the high temperature, the coating bubbles can adhere to the inner wall of the container, thereby increasing the stability and durability of the container. In particular, the coating bubbles can be bonded to the container or container element in such a way that the two components can be separated for recycling.

[0014] As an alternative, the coating bubble can also be fixed with the notch on the container to prevent it from sliding relative to the container. When the coating bubble is abutted against the notch of the container, a shape-fit connection is formed.

[0015] In an alternative embodiment, particularly when the coating bubble and the material of the container cannot or cannot be easily recovered together, the coating bubble may simply rest against the inner wall of the container, which makes it easier to separate the layers for recycling the container.

[0016] In another embodiment, biodegradable materials, in particular PLA, PBAT, PHA; PHBH, cellulose-based polymers, starch polymers, protein-based polymers, lignin-based polymers or natural rubber, or plastics, in particular PEF, PE, PET, HDPE, PVOH or EVOH, or mixtures thereof, can be used as the material for coating the bubbles. This can reduce the environmental impact of the container, especially in the event of improper disposal. In addition, the recycling of the container can be simplified. In particular, the coated bubbles can be designed as a multilayer structure to increase the resistance to thermal and / or mechanical loads.

[0017] Furthermore, if the material of the container is made of biodegradable fibers (as described above), such a container, for example with an eco-fiber base structure and a biodegradable material coating, can be recycled or biodegraded in an environmentally friendly manner in one step.

[0018] In another embodiment, the coating bubbles are pressurized in such a manner that the coating bubbles account for less than 25% of the weight of the container, particularly less than 10%.

[0019] As an alternative, the coating bubble is pressurized in such a way that the wall thickness of the expanded coating bubble is at least partially less than 20%, in particular less than 10%, of the container wall thickness.

[0020] In this case, the wall thickness of the coating bubble and the container are compared in the region in which the coating bubble lies against the container.

[0021] Such a coating bubble wall thickness helps to seal the fiber-containing material of the container watertightly on the inside. At the same time, the mass of the container is not excessively increased by the coating bubble or the coating formed thereby, and less coating material is consumed.

[0022] In another embodiment, the coating bubble can be pressurized with an overpressure of at least 50,000 Pa (0.5 bar), in particular between 1,000,000 Pa (10 bar) and 4,000,000 Pa (40 bar), so that the container is shaped with a corresponding counterpressure and the coating bubble is pressed against the inner wall of the container to flatten the inner wall of the container. The wall thickness of the container can also be compressed so that the moisture is at least partially pressed out of the container, thereby reducing the residual moisture content of the container.

[0023] In another embodiment, the temperature of at least one area of ​​the container and at least one area of ​​the coating bubble can be increased by hot air, steam, infrared radiation, microwave radiation, induction or fluid or thermocouple heat transfer, thereby drying some areas of the container in an energy-saving manner and bringing some areas of the coating bubble to processing temperature in an energy-saving manner.

[0024] In another embodiment, the temperature of at least one region of the container can be increased and the container can be at least partially dried to a residual moisture content of less than 20%, in particular to a residual moisture content of less than 10%, in order to produce a dimensionally stable and wear-resistant container. The overpressure that presses the coating gas bubble against the inner wall of the container during the drying of the container helps to prevent the container from shrinking.

[0025] In another embodiment, the temperature of at least one region of the coating bubble can be at least temporarily increased to 20° C. to 250° C., in particular to 100° C. to 200° C. This makes the coating bubble more elastic, easier to process, and conforms to the inner wall of the container when it is pressed against it.

[0026] In another embodiment, a gas (especially air) or a liquid (especially water) or a product to be packaged in a container can be used as a pressure medium. In particular, when the product to be packaged is used as a pressure medium, the filling step can be performed simultaneously with the application of the coating bubble, thereby improving the efficiency of the manufacturing process.

[0027] In another embodiment, the method may include: forming a fiber-containing (especially pulp-containing) container element, the container element comprising an opening, wherein the container element is provided in a mold and the container element is formed especially around a coating bubble, wherein the individual container elements are spliced ​​together by the coating bubble. In this way, the flexibility of container forming can be increased.

[0028] This object is also achieved by the device according to the invention.

[0029] The device is designed so that the coating bubbles can be separated after the container is pressurized and can remain in the container as a coating on the inner wall of the container. This eliminates the need to release the pressure in the coating bubbles and then remove the bubbles after forming. The coating bubbles thus have a dual function and the forming and coating processes can be carried out simultaneously. This means that the device can be used to implement the method of manufacturing fiber-containing containers in a more time-saving and energy-saving manner.

[0030] According to another embodiment, the device may further include: a drying device for increasing the temperature of at least one area of ​​the container and at least one area of ​​the coating bubble, wherein the drying device can be designed to at least partially dry the container, to allow the coating bubble to at least partially adhere to the inner wall of the container, and in particular to allow the coating bubble to at least partially form a connection with the inner wall of the container.

[0031] Since the coating bubble can be used for both forming and coating in the container, the container and the coating bubble can be heated together by the drying device so that the container can be dried and the coating bubble can be brought to processing temperature. This can save energy and time when manufacturing coated containers because the heating required for drying and coating can be combined.

[0032] According to another embodiment, the coating device is designed so that the coating bubbles are subjected to an overpressure of at least 50,000 Pa (0.5 bar), in particular an overpressure between 1,000,000 Pa (10 bar) and 4,000,000 Pa (40 bar), so that the container can be formed under a corresponding counterpressure, the coating bubbles can be pressed against the inner wall of the container, thereby flattening the inner wall of the container. It is also possible to compress the container wall thickness, so that water can be at least partially pressed out of the container, thereby reducing the residual moisture content of the container.

[0033] According to another embodiment, the drying device can be designed to increase the temperature of at least one area of ​​the container and at least one area of ​​the coating bubble by hot air, steam, infrared radiation, microwave radiation, induction or fluid or thermocouple heat transfer, thereby drying at least some areas of the container and bringing at least some areas of the coating bubble to processing temperature in an energy-saving manner.

[0034] In another embodiment, the coating device can be designed to splice different container elements together by means of coating bubbles. In this way, the flexibility of container molding can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be described in further detail below with reference to the accompanying drawings and in conjunction with the embodiments. The individual features of the various embodiments may be combined here to achieve a new design.

[0036] Figure 1 This is the device according to the first embodiment.

[0037] FIG. 2A to FIG. 2F The method steps for forming and coating a container using the device according to the first embodiment.

[0038] FIG. 3A to FIG. 3C Various embodiments of coating bubbles. DETAILED DESCRIPTION

[0039] Figure 1 An apparatus 100 is shown, which comprises a mould 2 in which the container 1 is to be at least partially formed. The mould 2 can be of two-piece or multi-piece design. In order to pressurize the coating bubble 4, the apparatus 100 further comprises a coating device 5 and a pressure source 10, in particular a pump or a compressor, and a separation device 8. The pressure source 10 can be designed to generate a maximum overpressure of at least 50000 Pa (0.5 bar), in particular at least 1000000 Pa (10 bar).

[0040] Furthermore, the device 100 can also comprise a drying device 7 , by means of which the temperature of the container 1 and the coating bubble 4 can be at least partially increased.

[0041] The drying device 7 can provide heat in particular by means of hot air, steam, infrared radiation, microwave radiation, induction, fluid or thermocouple heat transfer.

[0042] like Figure 2E As shown, the separation device 8 can mechanically separate the coating bubble 4 from the coating device 5. The separation device 8 can be designed to have a sharp edge, in particular, it can be screwed in or retracted, so as to separate or cut off the coating bubble 4 from the coating device 5 after the coating bubble 4 enters the container 1 and is pressurized.

[0043] The separating device 8 can be designed in two parts, wherein two mechanical separating elements, which are designed in particular with sharp edges, can be moved towards each other in order to separate or cut off the coating bubble 4 from the coating device 5 .

[0044] The separation device 8 can be further designed as a thermal element. In this way, the coating bubble 4 can be locally heated, the coating bubble 4 is melted at the heated position, and the coating bubble 4 is separated from the coating unit 5.

[0045] In addition, the separation device 8 can also separate the coating bubble 4 from the coating unit 5 by moving away the coating device 5 or the mold 2 or the container 1 .

[0046] With the aid of the device 100, the method can be carried out as follows:

[0047] In the first method step I ( Figure 2A ), the container 1 is at least partially formed in a mold 2 and comprises an opening 3. The mold 2 can in particular be of two-piece or multi-piece design so that the container 1 with the undercut 9 can be removed from the mold 2 without damaging the mold 2 or the container 1, the undercut being in particular a region of the opening 3 of the container 1 which is conical compared to the body 6 of the container 1. Furthermore, the container 1 in the first method step I can be formed from a pulp-containing material having a residual moisture content of more than 20%.

[0048] Therein, the container 1 can be formed in the mold 2 with the opening 3 facing upward, but can also be formed upside down or in another orientation.

[0049] In method step II ( Figure 2B ), the coating bubbles 4 can be formed inside the container 1 by means of the coating device 5, or can be fed into the container 1 through the opening 3. The material used to form the coating bubbles 4 can be, for example, a film / foil, or a liquid, especially a biodegradable material, such as Ecovio, PLA, PBAT, PHA, PHBH, cellulose-based polymers, starch-based polymers, protein-based polymers, lignin-based polymers, natural rubber or base materials such as PEF, PE, HDPE, PVOH and EVOH.

[0050] If the coating bubble 4 is introduced into the container 1 through the opening 3, the coating bubble is designed in particular to pass through the opening 3 in an unpressurized state (no overpressure inside the coating bubble 4 or an overpressure greater than 50,000 Pa (0.5 bar)).

[0051] exist Figure 2C In the method step III shown, the coating bubble 4 is pressurized with a pressure medium by means of a pressure source 10, so that it expands, and the coating bubble is at least partially pressed against the inner wall of the container. Figure 2CIn the embodiment, the pressure of the container 1 is indicated by an arrow pointing to the inner wall of the container 1, in particular at least 50000 Pa (0.5 bar), in particular at least 1000000 Pa (10 bar), so that the coating bubbles 4 press the container 1 against the mold 2 or compress its wall thickness. In this way, the inner surface of the container 1 can be smoothed. The coating bubbles 4 can also compress the wall thickness of the container 1 to squeeze out the liquid in the material of the container 1 (in particular the pulp-containing material). In this way, the residual moisture content of the container 1 can be reduced to below 20%, in particular below 10%, so that the container 1 does not need to be further dried.

[0052] In particular, a gas (e.g. air), a liquid (e.g. water) or a product to be filled into the container 1 can be used as the pressure medium. If the product to be filled into the container 1 is already used as the pressure medium, an additional filling process can be omitted and the production of the container and the subsequent packaging of the product can also be carried out more efficiently.

[0053] Furthermore, the coating bubble 4 can be designed in such a way that when the pressure medium transfers the overpressure from the pressure source 10 to the coating bubble 4, the coating bubble 4 first abuts against the inner wall of the container 1 in the lower region 6 and then also against the inner wall of the container 1 in the region of the opening 3. This prevents the formation of inclusions in the wall thickness of the container 1, in particular inclusions of air previously present in the container 1.

[0054] In particular, the coating bubble 4 is pressurized in such a way that the wall thickness of the coating bubble is less than 20% of the wall thickness of the corresponding section of the container 1 against which the coating bubble 4 is in contact.

[0055] exist Figure 2D In the optional method step IV shown, the temperature of the container 1 and the coating bubble 4 can be increased. Figure 2D As shown by the arrow pointing to the inside of the container 1, the pressure source 10 pressurizes the coating bubble 4 during the heating or temperature increase process.

[0056] As the temperature increases, the container 1 can be dried, in particular to reduce the residual moisture content to below 20%, in particular to 1%-10%. The drying process helps to improve the stability and shape accuracy of the container 1. Since the coating bubble 4 is pressurized during the optional drying process, the shrinkage of the container 1 during the drying process is offset. This ensures that the finished container has an accurate shape.

[0057] Furthermore, at least partially elevated temperatures, in particular temperatures between 100° C. and 200° C., may allow the coating bubbles 4 to adhere to the inner wall of the container 1, thereby making the coated container 4 more stable and durable.

[0058] As an alternative, the temperature can also be lowered. In this way, the coating bubble 4 is only attached to the inner wall of the container 1, and adhesion between the coating bubble 4 and the container 1 is prevented. This method is particularly suitable for the following situations: one of the materials of the coating bubble 4 or the container 1 is not biodegradable, and the two layers can be separated during the recycling process.

[0059] The temperature can be increased using various heat sources such as hot air or steam, infrared, microwave radiation, induction, thermally conductive liquids or thermocouples. A schematic diagram of an infrared lamp for increasing the temperature of at least one region of a container or coated bubble is shown in FIG. Figure 2D shown.

[0060] In method step V ( Figure 2E ), use a separation device 8 to separate the coating bubble 4 that has at least partially adhered to the inner wall of the container 1 from the coating device 5 or the pressure source 10, so that the coating bubble 4 remains in the container 1 as a coating.

[0061] In addition, if Figure 2F As shown in optional method step VI in , in addition to the coating bubbles 4 that have been fed into the container 1, at least one additional coating step can be performed to apply at least one additional coating layer. The maximum thickness of the additional coating layer can be 1.0 mm, in particular 0.000001 mm. The additional coating layer can be applied to the coating bubbles 4 as additional coating bubbles 12, for example using an additional coating device 11, with the additional coating layer facing the inside of the container. As an alternative, the additional coating bubbles 12 can also be applied by a coating device 5, which is also used to feed the coating bubbles 4 into the container 1 and pressurize them.

[0062] The additional coating bubble 12 can be separated from the additional coating device 5 or (in the alternative) coating device 5 by the separation device 8 or an additional separation device (not shown) mechanically, thermally or by moving away from the additional coating device 5 or (in the alternative) coating device 5 .

[0063] It is likewise conceivable to increase the temperature of the container 1 and of the additional coating, which enters the container 1, for example in the form of additional coating bubbles 12, by means of the drying device 7. This can make the additional coating easier to process.

[0064] It is conceivable that the additional coating is applied, for example by spraying or otherwise, so that the additional coating is directed toward the inside of the container 1. In particular, the additional coating can be made of a material that minimizes the gas permeability of the coated container 1, in particular SiOx, with a thickness in particular between 0.000015 mm and 0.00002 mm.

[0065] As an alternative, the additional coating can also be applied with the aid of plasma coating technology. For this purpose, a processing device (not shown) can introduce a gas into the interior of the container 1. A gas suitable for a plasma process can be introduced into the container 1 and distributed as evenly as possible inside the container. In particular, the gas introduced into the interior of the container 1 can be ignited, thereby generating a plasma. For this purpose, for example, an electrode can be placed in the container 1. The energy for igniting the plasma can then be introduced in the form of high frequency via this electrode. Specifically, this gas can be a mixture of a silicon-containing precursor and oxygen, which is particularly suitable for PECVD (plasma enhanced chemical vapor deposition) of silicon oxide. However, other gases are also conceivable, such as acetylene for depositing so-called DLC layers.

[0066] The additional coating helps reduce gas permeation of the container 1, thereby extending the shelf life of the liquid / food stored in the container. At the same time, the additional coating helps to keep the overall weight of the coating below 10%, especially below 5%, which is convenient for recycling.

[0067] Figure 2F The implementation of method step VI is shown when the container 1 has been removed from the mold 2. However, method step VI can also be implemented while the container 1 is still in the mold 2.

[0068] As an alternative embodiment, a coating bubble 4 with an internal pressure lower than 10000 Pa (10 bar) or another device (not shown) can be used to move the container 1 to a second mold (not shown), in particular a mold having a smoother surface than the first mold 2, and to mold and / or dry the container 1 in the mold.

[0069] In particular, the second mould can be preheated or heated continuously, which means that energy-intensive heating of the mould 2 for drying the container 1 and processing the coating bubble 4 can be dispensed with.

[0070] Furthermore, the mold 2 can be heated during the forming process of the container 1 so that the temperature of the mold 2 is higher than the temperature of the container 1 in order to dry the container 1. The mold 2 can be heated to 500° C., in particular 250° C. The mold 2 heated in this way can be used for pre-drying or complete drying of the container 1. In the case of pre-drying, the residual moisture content of the container can be reduced from up to 90% to between 10% and 30%, and in the case of complete drying, to between 5% and 10%. During the drying process, free water can be removed by compression on the one hand, and water bound to the fibers of the container 1 can also be removed by increasing the temperature of the mold 2 on the other hand.

[0071] In addition, the mold 2 can be porous and have vacuum channels. This allows vacuum to be applied to the mold 2 (e.g. FIG. 2A to FIG. 2D ) in order to be able to extract free water / water vapor released during the forming and / or drying process.

[0072] According to Figure 3A In the embodiment shown, no other fasteners (not shown) may be provided in the outlet region 41 of the coating bubble 40 toward the container outlet (not shown). In another step, fasteners (not shown) for sealing members may also be glued to the bubble 41, or sealing members, such as lids (with or without threads) and / or seals, may be fastened directly to the container.

[0073] According to Figure 3B In the embodiment shown, the coating bubble 50 may have a lip 52 in the outlet region 51. By means of the lip 52, the coating bubble 50 can be connected to the outlet section of the container (not shown) in a waterproof manner in the axial direction of the longitudinal axis A. It is also possible to connect a closure directly to the lip 52 of the coating bubble 50, thereby forming a waterproof sleeve to prevent the container (especially a container made of pulp-containing material) from contacting the liquid in the coating bubble 50.

[0074] like Figure 3C As shown, the coating bubble 60 can have a thread 63 and a closing ring / support ring 62, in particular in the outlet region 61. The thread 63 can be used to connect the coating bubble 60 to the closure in a waterproof manner. The closing ring / support ring 62 can serve as a stop for the closure screwed onto the thread. In addition, when transporting the coating bubble 60, there can be a container (not shown) around the coating bubble 60, or there can be no container.

[0075] As an alternative, it is also possible to first mold a plurality of container elements and then join them together using the coating bubble. The multi-piece design of the container means that more complex geometries can be produced with relatively simple molds. At the same time, the coating bubble can also seal the individual container elements from each other in an airtight and / or waterproof manner.

[0076] In another alternative embodiment, the coating bubble can be fed into the mold before the container is formed. In this case, the fibers (especially pulp) are made to flow around the coating bubble, and then the container is formed and coated. This allows the manufacturing process to be designed more flexibly.

Claims

1. A method for forming and coating a fiber-containing (especially pulp-containing) container (1), wherein the method comprises: - forming a fiber-containing (especially pulp-containing) container (1), said container comprising an opening (3), wherein said container (1) is provided in a mold (2), or - shaping a fiber-containing, in particular pulp-containing, container element, said container element comprising an opening, wherein said container element is provided in a mold (2), - a shaped coating bubble (4, 40, 50, 60) which is at least temporarily and / or partially surrounded by the container (1) or container element, - pressurizing the coating bubble (4, 40, 50, 60) with a pressure medium from a pressure source (10) to expand it, so that the coating bubble (4, 40, 50, 60) at least partially abuts against the inner wall of the container (1) or the container element and optionally at least partially compresses the wall thickness of the container (1), and - separating the coating bubble (4, 40, 50, 60) from the pressure source (10), At the same time, the coating bubbles (4, 40, 50, 60) remain at least partially in the container (1) or in the container element as a container coating.

2. The method according to claim 1, wherein a biodegradable material, in particular PLA, PBAT, PHA; PHBH, cellulose-based polymers, starch polymers, protein-based polymers, lignin-based polymers or natural rubber, or a plastic, in particular PEF, PE, PET, HDPE, PVOH or EVOH, or a mixture of the above materials, is used as the material of the coating bubble (4, 40, 50, 60).

3. A method according to claim 1 or 2, wherein the coating bubbles (4, 40, 50, 60) are pressurized in such a way that the coating bubbles (4, 40, 50, 60) account for less than 25%, in particular less than 10%, of the weight of the container (1) or the container part.

4. The method according to any of the preceding claims, wherein the coating bubble (4, 40, 50, 60) is pressurized with an overpressure of at least 50,000 Pa, in particular between 1,000,000 Pa and 40,000,000 Pa.

5. The method according to any one of the preceding claims, wherein the method further comprises: The temperature of at least one area of ​​the container (1) or the container element and at least one area of ​​the coating bubble (4, 40, 50, 60) is increased, thereby at least partially drying the container (1) or the container element, and making the coating bubble (4, 40, 50, 60) at least partially adhere to the container (1) or the container element, and optionally connecting the coating bubble (4, 40, 50, 60) at least partially to the inner wall of the container (1) or the container element.

6. A method according to claim 5, wherein the temperature of at least one region of the container (1) or the container element and at least one region of the coating bubble (4, 40, 50, 60) is increased by hot air, steam, infrared radiation, microwave radiation, induction or fluid or thermocouple heat transfer.

7. The method according to claim 5 or 6, wherein the temperature of the container (1) or at least one area of ​​the container element is increased so that the container (1) is at least partially dried to a residual moisture content of less than 20%, in particular to a residual moisture content of less than 10%.

8. The method according to any one of claims 2 to 7, wherein the temperature of at least one region of the coating bubble (4, 40, 50, 60) is at least temporarily increased to 20°C to 250°C, in particular to 100°C to 200°C.

9. The method according to any of the preceding claims, wherein a gas, in particular air, or a liquid, in particular water, or the product to be packaged in the container is used as the pressure medium.

10. The method according to any one of the preceding claims, wherein the method comprises: A shaped fiber-containing (especially pulp-containing) container element comprising an opening, wherein the container element is provided in a mold (2) and is especially formed around coating bubbles (4, 40, 50, 60), wherein the individual container elements are spliced ​​together by the coating bubbles (4, 40, 50, 60).

11. A device for forming and coating a fiber-containing (especially pulp-containing) container (1) or a container element, the container element having an opening (3), in particular according to the method of claims 1 to 10, wherein the device (100) comprises: a mould (1) in which the container (1) or the container element is to be at least partially formed, - a coating device (5) for forming a coating bubble (4, 40, 50, 60) and a pressure source (10), the pressure source being used to apply a pressure medium to the coating bubble (4, 40, 50, 60) to expand it, so that the coating bubble (4, 40, 50, 60) at least partially abuts against the inner wall of the container (1) or the container element, in particular, the coating bubble (4, 40, 50, 60 at least partially compresses the container (1) or the wall thickness of the container element, and A separation device (8) for separating the coating bubble (4, 40, 50, 60) from the pressure source (10), while the coating bubble (4, 40, 50, 60) remains as a coating in the container (1) or in the container element.

12. The device according to claim 11, wherein the coating device (5) is designed so that the coating bubble (4, 40, 50, 60) is subjected to an overpressure of at least 50,000 Pa, in particular an overpressure between 1,000,000 Pa and 40,000,000 Pa.

13. The device according to claim 11 or 12, wherein the device (100) further comprises: A drying device (7) for increasing the temperature of at least one area of ​​the container (1) or the container element and at least one area of ​​the coating bubble (4, 40, 50, 60), wherein the drying device is designed to at least partially dry the container (1) or the container element, so that the coating bubble (4, 40, 50, 60) at least partially adheres to the inner wall of the container (1) or the container element, and in particular, so that the coating bubble (4, 40, 50, 60) is at least partially connected to the inner wall of the container (1) or the container element.

14. An apparatus according to claim 13, wherein the drying device (7) is designed to increase the temperature of at least one region of the container (1) or the container element and at least one region of the coating bubble (4, 40, 50, 60) by hot air, steam, infrared radiation, microwave radiation, induction or fluid or thermocouple heat transfer.

15. The device according to any one of claims 11 to 14, wherein the coating device (5) is designed to join together different container elements by means of the coating bubble (4, 40, 50, 60).

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