Lining for a container

Abstract

The invention relates to a lining (1) for a container for receiving a granular material that has a blowing agent. The lining (1) has at least one polyamide layer (4) that is arranged between two ethylene copolymer layers (2).

Description

[0001] Lining for container

[0002] Description

[0003] The invention relates to a lining for a container for receiving a granulate containing a propellant.

[0004] A container or receptacle is an object with a hollow interior, primarily intended to separate its contents from the environment. Some container types have the option of being sealed. Containers and receptacles are used to store or preserve various objects for a specific period of time. They can also be used to group or organize individual or bulk goods. Another area of ​​application is the protection of the contents from external influences or, conversely, the protection of the environment from the hazards posed by the contents during storage and transport.

[0005] Open-top containers are used, for example, in the chemical industry for filling granular substances, where an internal lining with a plastic film is intended to prevent the product from escaping from the container and at the same time provide protection against moisture.

[0006] An octabin is an octagonal container for transporting and storing bulk goods. It is made of sturdy corrugated cardboard and has a base and a removable lid. Its basic dimensions are usually 1200 mm x 1200 mm, allowing it to fit on a Euro pallet. The height can be selected between 800 mm and 2000 mm as required. Octabins are primarily used for granules and other free-flowing products. For dusty goods, a thin plastic film, also called an inlay or liner, can be inserted.

[0007] Film-based lining, for example, of cardboard containers, is usually done manually using prefabricated plastic bags. A prefabricated bag or film sack is inserted from above and folded outward at the top edge of the container, thus preventing it from being drawn into the container. After the filling process, the film sack is manually removed from the top edge of the container and sealed. Alternatively, there are also sealed film sacks that can be filled mechanically via a tube and a tube opening in the film sack.

[0008] DE 20 2015 101 558 U1 discloses a tarpaulin for a container filled with fine-grained bulk material, in particular plastic granulate, having at least one opening for a suction pipe that can be inserted into the container from above and is connected to a suction device that sucks the fine-grained bulk material out of the container and transports it away. The tarpaulin consists of a flexible sheet-like structure and a contour adapted to the top opening of the container, with an edge that projects beyond the casing wall of the container, which edge is elastic or gathered by means of an elastic or inelastic band and rests against the outer surface of the casing wall of the container in the upper edge region, and in that a closable slot is provided in the sheet-like structure, which extends from the edge region towards the center of the container opening and can be expanded to accommodate the suction pipe, at least in the insertion region of the suction pipe.

[0009] EP 2 233 283 A2 describes a method for lining the inside of a container open on one side with a plastic film, comprising the steps of: feeding and positioning a container to be lined at a working position, detecting a container height, providing an expandable film tube, welding and cutting a predetermined length of the film tube and forming a bag-shaped film tube section which has a length depending on the detected container height, gathering the film tube section and moving it into a transfer position adjacent to a container opening, unwinding a part of the gathered film tube section, holding a free edge section of the film tube section and expanding and pulling the edge section over an edge of the container, and unwinding the edge section to rest against an outer wall of the container.

[0010] Granular matter, also called granular medium or granules, consists of many small, solid particles such as grains or spheres. Examples of this state include granular materials such as plastic granules and powdered materials.

[0011] Plastic granulate is the typical delivery form of thermoplastics from raw material manufacturers for the plastics processing industry. Due to its free-flowing properties, it is a bulk material like sand or gravel and is therefore just as easy to transport. Plastic granulate is often also referred to as plastic pellets.

[0012] However, plastic granules often present particular challenges when handling them. For example, filling operations typically result in electrostatic charging of the lining and filling equipment, which can only be safely handled with the help of well-thought-out and consistent electrostatic discharge without creating a significant hazard for workers in the immediate vicinity of such filling operations. Furthermore, there are numerous plastic granules that continue to outgas reactants and / or products and / or additives such as propellants long after production. The combination of outgassing, potentially explosive substances with the electrostatic charge generated by the granules poses a major challenge and enormous hazard potential for linings optimized for their mechanical properties.The object of the present invention is to provide a lining for a container that has sufficient electrostatically dissipative properties while simultaneously preventing the passage of outgassing. Furthermore, the lining should be mechanically suitable for filling and emptying granules. Furthermore, the lining should only allow water vapor to pass through in a very defined area. The lining should be as thin as possible while simultaneously being puncture-resistant.

[0013] This object is achieved according to the invention by a lining for a container, a method, and a use according to the independent main claims. Preferred variants can be found in the dependent claims, the description, the exemplary embodiment, and the drawings.

[0014] According to the invention, the lining comprises at least one polyamide layer arranged between two ethylene copolymer layers.

[0015] Polyamides are linear polymers with regularly repeating amide bonds along the main chain. The amide group is a condensation product of a carboxylic acid and an amine, allowing for the creation of very different polyamides depending on the choice of carboxylic acid and amine.

[0016] Polyamides exhibit excellent strength and toughness, while also being able to block the passage of blowing agents such as pentane. For the polyamide layer according to the invention, for example, PA 6 and / or PA 6.6 and / or PA 6.66 can be used.

[0017] In a particularly advantageous variant of the invention, the thickness of the polyamide layer is less than 50 μm, preferably less than 40 μm, in particular less than 30 μm, and / or more than 5 μm, preferably more than 10 μm, in particular more than 15 μm. The polyamide layer can thus be particularly thin and material-saving, while simultaneously ensuring effective protection against the penetration of propellant. This can, in particular, effectively prevent the formation of an explosive mixture outside the container.

[0018] The ethylene copolymer layer consists of an ethylene and at least one copolymer.

[0019] Ideally, the ethylene copolymer layer is made of ethylene and vinyl acetate. Vinyl acetate is an organic chemical compound from the carboxylic acid ester group. Ethylene vinyl acetate (EVA) is used to achieve a defined water vapor permeation through the lining.

[0020] In a favorable variant, the proportion of ethylene vinyl acetate (EVA) in the ethylene copolymer layer is more than 45 wt.%, preferably more than 55 wt.%, in particular more than 65 wt.% and / or less than 90 wt.%, preferably less than 85 wt.%, in particular less than 80 wt.%.

[0021] Advantageously, the proportion of vinyl acetate in the ethylene-vinyl acetate is more than 10 wt.%, preferably more than 13 wt.%, in particular more than 16 wt.% and / or less than 25 wt.%, preferably less than 22 wt.%, in particular less than 19 wt.%. Within the scope of this weight proportion, a low and defined water vapor permeation can be achieved. The defined water vapor permeation ensures that the container, in particular the octabin made of corrugated cardboard, does not become moistened and thus risk losing stability, and at the same time, no moisture can accumulate inside the lining. In a preferred variant of the invention, the proportion of vinyl acetate in the ethylene copolymer layer is more than 5 wt.%, preferably more than 8 wt.%, in particular more than 12 wt.% and / or less than 35 wt.%, preferably less than 30 wt.%, in particular less than 25 wt.%.

[0022] In an advantageous variant of the invention, the ethylene copolymer layer comprises a chalk compound, wherein the proportion of chalk compound is more than 5 wt.%, preferably more than 10 wt.%, in particular more than 15 wt.%, and / or less than 40 wt.%, preferably less than 35 wt.%, in particular less than 30 wt.%. This advantageously reduces the polymer content of the lining and simultaneously enables rolling onto webs without the individual film webs of the lining sticking to one another.

[0023] In an alternative variant of the invention, the ethylene copolymer layer could also comprise an antiblocking agent.

[0024] The filler content can be determined using well-known measurement methods such as ashing. A sample with a known initial weight is heated to a temperature at which the polymer thermally decomposes but the filler does not. A temperature of 560 °C, for example, has proven effective for this purpose. The sample weight is then measured again. The polymer content per square meter can be calculated from the difference between the initial and final weight.

[0025] As an alternative to ashing, a TGA measurement is possible, in which the weight of a sample is continuously measured during heating. This test method can also clearly differentiate between polymer and filler and allows the polymer content of the film to be determined.

[0026] Ideally, the proportion of chalk in the chalk compound is more than 30% by weight, preferably more than 40% by weight, in particular more than 50% by weight and / or less than 90% by weight, preferably less than 80% by weight, in particular less than 70% by weight.

[0027] In a particularly advantageous variant of the invention, calcium carbonate (CaCO3) is used in the chalk compound, preferably with an average particle size of 0.8 to 2.5 pm.

[0028] In a particularly advantageous variant of the invention, the thickness of the ethylene copolymer layer is less than 45 pm, preferably less than 30 pm, in particular less than 15 pm and / or more than 3 pm, preferably more than 6 pm, in particular more than 9 pm. The ethylene copolymer layer is particularly thin and material-saving, and enables defined water vapor permeation through the lining.

[0029] In a particularly promising variant of the invention, at least one ethylene copolymer layer has a permanent antistatic agent.

[0030] Advantageously, the proportion of the permanent antistatic agent in the ethylene copolymer layer is more than 10 wt.%, preferably more than 15 wt.%, in particular more than 20 wt.% and / or less than 60 wt.%, preferably less than 50 wt.%, in particular less than 40 wt.%.

[0031] Preferably, at least the inner ethylene copolymer layer contains a permanent antistatic agent. The inner layer can be connected to a grounding system during filling and emptying of the granules, thus preventing dangerous electrostatic charging.

[0032] The safe avoidance of electrostatic charging ensures safety, in particular in the case of a propellant such as pentane evaporating from the granulate, which can form an explosive mixture with air or the oxygen in the air and could be ignited by electrostatic sparking.

[0033] Preferably, the permanent antistatic agent, such as ionphase™, consists of inherently dissipative polymers. These reduce the resistivity of polymers, such as those found in ethylene copolymer layers, and provide control and safety for electrostatic problems. Such a permanent antistatic agent can be added during compounding and / or extrusion. These non-migrating additives do not move or migrate through or out of a polymer layer.

[0034] Ideally, the lining, due to the integrated permanent antistatic agent, has a specific surface resistance according to DIN IEC 60093 with parallel contact electrodes of more than 10 7 Q, preferably more than 10 8 Q, especially of more than 10 9 Q on and / or of less than 10 14 Q, preferably less than 10 13 Q, especially less than 10 12 Q. This effectively prevents electrostatic charging.

[0035] In a particularly advantageous variant of the invention, the lining has at least one adhesion promoter layer arranged between the polyamide layer and the ethylene copolymer layer.

[0036] Ideally, the polyamide layer is formed as a middle layer and is bordered on both sides by an adhesion promoter layer, which in turn is covered by an ethylene copolymer layer.

[0037] In a favorable variant, the proportion of ethylene-vinyl acetate (EVA) in the adhesion promoter layer is more than 40 wt.%, preferably more than 50 wt.%, in particular more than 60 wt.% and / or less than 90 wt.%, preferably less than 85 wt.%, in particular less than 80 wt.%. Advantageously, the proportion of vinyl acetate in the ethylene-vinyl acetate of the adhesion promoter layer is more than 10 wt.%, preferably more than 13 wt.%, in particular more than 16 wt.% and / or less than 25 wt.%, preferably less than 22 wt.%, in particular less than 19 wt. Within the scope of this weight proportion, a low and defined water vapor permeation can be achieved. The defined water vapor permeation ensures that the container, in particular the octabin made of corrugated cardboard, does not become moistened and thus lose stability, and at the same time, no moisture can accumulate inside the lining.

[0038] In a preferred variant of the invention, the proportion of vinyl acetate in the adhesion promoter layer is more than 5% by weight, preferably more than 8% by weight, in particular more than 11% by weight and / or less than 30% by weight, preferably less than 25% by weight, in particular less than 15% by weight.

[0039] Advantageously, the adhesion promoter layer contains a proportion of maleic anhydride-modified linear low-density polyethylene, wherein the proportion of maleic anhydride-modified linear low-density polyethylene is more than 5 wt.%, preferably more than 10 wt.%, in particular more than 20 wt.%, and / or less than 60 wt.%, preferably less than 50 wt.%, in particular less than 40 wt.%. As a result, both the polyamide layer and the ethylene copolymer layer adhere particularly well to the adhesion promoter layer. As a result, a stable bond between the individual layers of the lining is achieved, and dissolution effects of the individual layers are avoided.

[0040] In a particularly advantageous variant of the invention, the thickness of the adhesion promoter layer is less than 20 pm, preferably less than 15 pm, in particular less than 10 pm and / or more than 1 pm, preferably more than 2.5 pm, in particular more than 4 pm. The adhesion promoter layer is particularly thin and material-saving, allowing defined water vapor permeation through the lining.

[0041] The special design of a preferably five-layer lining results in a film that has a gas transmission rate for the propellant according to DIN 53380 of less than 5 g / m 2 ■ day, preferably less than 1 g / m 2 ■ day, especially less than 0.1 g / m 2 ■ day, measured at 38 °C and 50% RH. This ensures that the propellant pentane does not pass through.

[0042] Depending on the design of the granulate or plastic granulate surrounded and encased by the lining in the container, a blowing agent may outgas. In the case of expanded polystyrene, such a blowing agent may be pentane, which, together with atmospheric oxygen, can form an explosive mixture. Avoiding explosive mixtures is extremely important for the safe storage and / or transport of the granulate in a container. For this purpose, the lining according to the invention provides an effective blowing agent barrier and / or pentane barrier.

[0043] ASTM F1249 describes a method that uses an infrared detector to measure water vapor transmission. The water vapor transmission rate is expressed in g / m 2■ Day. The relative humidity can be set up to 100% and, along with temperature, is an important comparison factor. Since the infrared detector is a "relative measuring system," calibration must be performed during the measurement cycle using films whose transmittance values ​​are known.

[0044] Advantageously, the lining has a water vapor permeation according to ASTM F1249 of less than 50 g / m 2 ■ day, preferably less than 35 g / m 2 ■ day, especially less than 20 g / m 2 ■ day on and / or of more than 5 g / m 2 ■ day, preferably more than 8 g / m 2 ■ day, especially more than 11 g / m 2 ■ Day, measured at 23 °C and 85% RH.

[0045] After the production of plastic granules, water vapor escapes for a certain period of time. Therefore, a lining that allows water vapor to escape from the interior to the exterior is advantageous. However, the amount of escaping water should be so small that a container surrounding the lining, for example, made of corrugated cardboard, does not become soaked. At the same time, the water vapor permeability should be high enough that no puddles of moisture form within the lining. The lining according to the invention can achieve both of these properties thanks to its special construction and a clearly defined vinyl acetate content.

[0046] The lining preferably has at least five layers, which are preferably mirror-symmetrical to one another.

[0047] In alternative variants, the lining can also have seven or nine layers. In this case, one or two intermediate layers are preferably arranged between the ethylene copolymer layer and the adhesion promoter layer. These intermediate layers are free of a chalk compound and a permanent antistatic agent and consist largely of ethylene vinyl acetate (EVA). In a particularly advantageous variant of the invention, the thickness of the intermediate layer is less than 20 μm, preferably less than 15 μm, in particular less than 10 μm and / or more than 3 μm, preferably more than 5 μm, in particular more than 8 μm. In a preferred variant of the invention, the proportion of vinyl acetate in the intermediate layer is more than 5 wt.%, preferably more than 8 wt.%, in particular more than 11 wt.% and / or less than 30 wt.%, preferably less than 25 wt.%, in particular less than 15 wt.%.In a preferred variant of the invention, the lining has a fracture life according to DIN EN 55445 at 50% integrity of more than 0.25 h, preferably more than 0.5 h, in particular more than 0.75 h.

[0048] Films and sheets up to 1 mm thick are tested using strip or shoulder specimens. According to ISO 527-3 and ASTM D 882, strips are the usual specimen shape. This specimen shape can be easily produced using a cutting press or a film cutter. Shoulder specimens are often used in quality control. In this case, a direct-measuring extensometer is required, which can record the specimen strains directly on the specimen. Typical test results include yield stress, yield strain, maximum stress, and nominal strain at break.

[0049] The tensile properties are determined according to DIN EN ISO 527. In the tensile test, a sample strip of a lining is stretched at a constant speed specified in the test standard and the force F is recorded with the change in length AL of the test section Lo.

[0050] Ideally, the lining has a tensile strength in the machine direction according to DIN EN ISO 527-3 of more than 40 MPa, preferably more than 50 MPa, in particular more than 60 MPa.

[0051] In an advantageous variant of the invention, the lining has a tensile strength transverse to the machine direction according to DIN EN ISO 527-3 of more than 45 MPa, preferably more than 55 MPa, in particular more than 65 MPa.

[0052] The thickness of the lining was measured according to DIN 53370 and reported as an average value. In a preferred variant of the invention, the lining has a thickness of less than 200 pm, preferably less than 160 pm, in particular less than 120 pm, and / or more than 20 pm, preferably more than 30 pm, in particular more than 40 pm. The special combination of the preferably five layers of the lining and the special selection of polymers results in a very thin and material-saving film that can nevertheless withstand the mechanical stresses of filling, storing, and emptying the granulate in an octabin container.

[0053] In a particularly advantageous variant of the invention, the thickness of the lining is 50 pm.

[0054] A particularly obvious example of a plastic granulate is expandable polystyrene (EPS). This belongs to the group of organic, synthetic insulation materials. EPS insulation materials are mostly used for applications in the construction industry.

[0055] The finished plastic is usually sold as granules. In expandable polystyrene, gases are trapped during polymerization to form solid beads. The plastic beads, or plastic granules, are transported in octabins for further processing. When the beads are heated in steam at slightly above 100°C, the gas expands and the thermoplastic swells. The edges of the bubbles melt together. This creates a molded solid whose shape can be customized.

[0056] According to the invention, the container lining is manufactured in a multi-step process. First, the polymer blends of the ethylene copolymer layers, the adhesion promoter layers, and the polyamide layer are produced and prepared. The polymer blends are melted and coextruded into a lining film web, with the polyamide layer forming the inner layer. The film web is finished and welded to form a lining, which can then be inserted into an octabin container.

[0057] According to the invention, the lining is used as an electrostatically dissipative and / or propellant-blocking inner pocket for octabin containers.

[0058] The special combination of selected polymers and the material-saving design result in a lining that can retain outgassing propellants such as pentane within the lining while safely dissipating charges generated during the filling, transport, storage, or emptying of granules, especially plastic granules. Furthermore, despite its particularly thin design and the special material combination, the lining can withstand the mechanical stresses encountered during the filling and transport of plastic granules.

[0059] Further advantages and features of the invention will become apparent from the description of an embodiment with reference to drawings and from the drawings themselves.

[0060] This shows

[0061] Fig. 1 a sketch of an octabin container,

[0062] Fig. 2 is a schematic representation of the lining structure,

[0063] Fig. 3 shows another variant of the schematic representation of the lining structure.

[0064] Fig. 1 shows a commercially available Octabin 5, such as those used for the transport and storage of plastic granules. A lining 1 in the form of an inner pocket is inserted into the Octabin 5, which is usually made of corrugated cardboard and can then be filled with the granules. After filling, the lining 1 can be sealed, and the Octabin 5 can be covered with a lid or cover. This makes the Octabins 5, which are usually placed on pallets, suitable for stacking.

[0065] Fig. 2 shows a schematic representation of the structure of the lining 1. The five-layer lining 1 comprises an inner polyamide layer 4, which in this embodiment is made of PA 6.6 and has a thickness of 20 μm. The polyamide layer 4 is surrounded by two adhesion promoter layers 3, each with a thickness of 5 μm. In the embodiment shown, the adhesion promoter layer 3 consists of 30 wt.% Bondyram TL4110 and 70 wt.% ethylene vinyl acetate, with a vinyl acetate content of 17 wt.%.

[0066] The outer layers are each formed by an ethylene copolymer layer 2 with a thickness of 10 μm. The ethylene copolymer layer 2 comprises a 55 wt.% ethylene-vinyl acetate content with a 17 wt.% vinyl acetate content, a 25 wt.% chalk compound with a 60 wt.% chalk content, and 25 wt.% ionphase™.

[0067] The lining 1 has a gas transmission rate for the propellant pentane according to DIN 53380 of less than 0.1 g / m 2 ■ day, while the water vapor permeation according to ASTM F1249 is less than 20 g / m 2 day and / or more than 11 g / m 2 day. The lining 1 has a surface resistance according to DIN IEC 60093 of more than 10 7 Q and / or less than 10 12 Q on.

[0068] The illustration in Fig. 3 largely corresponds to the illustration in Fig. 2. However, the lining 1 has a seven-layer structure. The outer layers are each formed by an ethylene copolymer layer 2 with a thickness of 4 μm. The ethylene copolymer layer 2 comprises a 55 wt.% ethylene-vinyl acetate content with a 17 wt.% vinyl acetate content, a 25 wt.% chalk compound with a 60 wt.% chalk content, and 25 wt.% ionphase™.

[0069] An intermediate layer 6 is arranged between each outer layer and the adhesion promoter layer 3. The intermediate layer 6 comprises an ethylene-vinyl acetate with a vinyl acetate content of 17 wt.% and has a thickness of 6 pm.

Claims

Patent claims Lining (1) for a container (5) for receiving a granulate comprising a blowing agent, characterized in that the lining (1) has at least one polyamide layer (4) arranged between two ethylene copolymer layers (2). Lining according to claim 1, characterized in that the ethylene copolymer layer (2) is formed from ethylene and a vinyl acetate. Lining according to claim 2, characterized in that the proportion of vinyl acetate in the ethylene copolymer layer (2) is more than 5 wt.%, preferably more than 8 wt.%, in particular more than 12 wt.% and / or less than 35 wt.%, preferably less than 30 wt.%, in particular less than 25 wt.%. Lining according to one of claims 1 to 3, characterized in that the polyamide layer (4) is formed from a copolyamide 6.66.Lining according to one of claims 1 to 4, characterized in that the lining has at least one adhesion promoter layer (3). between the polyamide layer (4) and the ethylene copolymer layer (2). Lining according to claim 5, characterized in that the adhesion promoter layer (3) has a proportion of vinyl acetate, wherein the proportion of vinyl acetate is more than 5 wt.%, preferably more than 8 wt.%, in particular more than 11 wt.% and / or less than 30 wt.%, preferably less than 25 wt.%, in particular less than 15 wt.%. Lining according to claim 5 or 6, characterized in that the adhesion promoter layer (3) has a proportion of maleic anhydride-modified linear low-density polyethylene, wherein the proportion of maleic anhydride-modified linear low-density polyethylene is more than 5 wt.%, preferably more than 10 wt.%, in particular more than 20 wt.% and / or less than 60 wt.%, preferably less than 50 wt.%, in particular less than 40 wt.%.Lining according to one of claims 1 to 7, characterized in that the ethylene copolymer layer (2) comprises a chalk compound, wherein the proportion of chalk compound is more than 5 wt.%, preferably more than 10 wt.%, in particular more than 15 wt.% and / or less than 40 wt.%, preferably less than 35 wt.%, in particular less than 30 wt.%. Lining according to claim 8, characterized in that the proportion of chalk in the chalk compound is more than 30 wt.%, preferably more than 40 wt.%, in particular more than 50 wt.% and / or less than 90 wt.%, preferably less than 80 wt.%, in particular less than 70 wt.%. Lining according to one of claims 1 to 9, characterized in that at least one ethylene copolymer layer (2) comprises a permanent antistatic agent, wherein the proportion of the permanent antistatic agent is more than 10 wt.%, preferably more than 15 wt.%, in particular more than 20 wt.% and / or less than 60 wt.%, preferably less than 50 wt.%, in particular less than 40 wt.%. Lining according to one of claims 1 to 10, characterized in that the lining (1) has a gas transmission rate for the blowing agent according to DIN 53380 of less than 5 g / m 2 ■ day, preferably less than 1 g / m 2 day, especially less than 0.1 g / m2 day, measured at 38 °C and 50% RH. Lining according to one of claims 1 to 11, characterized in that the lining (1) has a water vapor permeation according to ASTM F1249 of less than 50 g / m 2 Day, preferably from less than 35 g / m 2 - day, especially less than 20 g / m 2 - day and / or more than 5 g / m 2 ■ day, preferably more than 8 g / m 2 ■ day, especially more than 11 g / m 2■ day, measured at 23 °C and 85% RH. Lining according to one of claims 1 to 12, characterized in that the lining (1) has at least five layers, which are preferably mirror-symmetrical to one another. Lining according to one of claims 1 to 13, characterized in that the lining (1) has a breaking time according to DIN EN 55445 at 50% integrity of more than 0.25 h, preferably of more than 0.5 h, in particular of more than 0.75 h. Lining according to one of claims 1 to 14, characterized in that the lining (1) has a tensile strength in the machine direction according to DIN EN ISO 527-3 of more than 40 MPa, preferably of more than 50 MPa, in particular of more than 60 MPa. Lining according to one of claims 1 to 15, characterized in that the lining (1) has a surface resistance according to DIN IEC 60093 of more than 10 7 Q, preferably more than 10 8 Q, especially more than 10 9 Q and / or of less than 10 14 Q, preferably less than 10 13 Q, especially less than 10 12 Q.

17. Lining according to one of claims 1 to 16, characterized in that the lining (1) has a thickness of less than 200 pm, preferably less than 160 pm, in particular less than 120 pm and / or more than 20 pm, preferably more than 30 pm, in particular more than 40 pm.

18. A method for producing a lining (1) with the following steps: providing and producing various polymer mixtures, coextrusion of the polyamide layer (4) with the ethylene copolymer layers (2) and the adhesion promoter layers (3) to form a lining (1), characterized in that the polyamide layer (4) is formed as the innermost layer.

19. Use of a lining (1) according to one of claims 1 to 17 as an electrostatically dissipating and / or propellant-blocking inner pocket for Octabin container.

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