Compostable top cover structure for a beverage preparation capsule

Abstract

The present invention relates to a capsule (100) for preparing a beverage in a beverage production machine, the capsule (100) comprising a capsule body (200) defining a chamber (250) for containing a beverage substance (500), an injection wall (220) closing the chamber at a first end of the capsule body (200), and a delivery wall (300) closing the chamber (250) at a second end. The delivery wall (300) comprises, in a layered manner, a carrier layer (320) for carrying subsequent layers, an optional filter layer (310), and a barrier layer (340) applied to the carrier layer (320), the barrier layer (310) providing preferred bidirectional barrier against moisture and / or gases. The delivery wall also includes at least one protective layer (350) and a connecting layer (330), the at least one protective layer being applied to the chamber-facing side of the barrier layer to protect the barrier layer from moisture at least, and the connecting layer being located on the chamber-facing side of the delivery wall (300) to connect the delivery wall (300) to the edge portion (211). The connecting layer (330) is made of a biodegradable material and contains at least a nonwoven aliphatic or aliphatic aromatic polyester selected from the list of materials including: polylactic acid (PLA), polyhydroxyalkanoate (PHA), polybutylene succinate (PBS), polybutylene succinate-co-adipate (PBSA), polybutylene adipate-co-terephthalate (PBAT), polybutylene sebacate-co-terephthalate (PBSeT), and their respective copolymers and combinations thereof. The invention also relates to systems comprising the proposed capsule and the use of the proposed capsule for preparing beverages in beverage production machinery.

Description

Technical Field

[0001] This invention relates to a capsule for preparing beverages in a beverage production machine, a system comprising the proposed capsule, and the use of the proposed capsule for preparing beverages in a beverage production machine. Background Technology

[0002] Single-serving beverage capsules for use in beverage preparation machines are known in the art. These capsules are commonly used for dispensing beverages on demand, such as coffee, tea, or hot chocolate, and are popular due to their fresh taste, flavor variability, and ease of beverage preparation.

[0003] Typically, a capsule containing beverage components is inserted into a capsule holder of a beverage preparation machine, the capsule holder is closed, and beverage preparation begins. A fluid (such as water or milk) is delivered to the capsule to interact with the beverage components contained within the capsule to produce the desired beverage. When a sufficient amount of fluid fills the capsule, the capsule opens under the pressure of the fluid to release the prepared beverage. For example, capsule opening can be accomplished by using the force generated by increasing the fluid pressure inside the capsule to press the extraction surface of the capsule against an opening structure provided in the capsule holder, causing the extraction surface to tear when it reaches its breaking stress. The opening structure can be multiple protruding and recessed elements, such as pyramidal elements, which the extraction surface extends onto and tears under the internal pressure of the fluid. This pressure-controlled beverage preparation has the advantage of producing high-quality beverages.

[0004] However, a large number of parameters and dynamic effects can affect the opening process of the capsule on the extraction surface with the aforementioned opening structure, and therefore, repeatability and consistency in the opening process are difficult to achieve, which may have a negative impact on the results of the finished beverage.

[0005] In particular, it has been found that the extraction surface, typically in the form of a delivery wall, needs to exhibit a certain amount of stiffness to ensure pressure buildup within the capsule while preventing capsule collapse during the opening process. Conversely, the extraction surface should be constructed such that it can be torn by the opening structure during opening. Furthermore, it is desirable to retain particles and fibers from beverage components inside the capsule to avoid not only contaminating the prepared beverage but also blocking the openings and / or opening structures within the capsule, which are configured to dispense the prepared beverage from the beverage preparation machine.

[0006] In existing technologies, these technical challenges are addressed by forming an extraction surface using an aluminum membrane with a very precisely controlled thickness, specifically around 30 to 40 micrometers. Aluminum offers numerous advantages, such as high pressure resistance, durability, flexibility, low weight, long shelf life, and preservation of the flavor of the prepared beverage. In addition to aluminum capsules, some consumers expect capsules made from alternative materials, particularly compostable ones.

[0007] Therefore, various attempts have recently been made to replace aluminum with alternative materials used in capsules. For example, bioplastics made from corn starch or dried pulp made from sugarcane fiber have been proposed as capsule materials. However, a drawback of such materials is that they do not possess the same material properties as currently used materials such as aluminum. For instance, capsules made from alternative materials typically have a limited shelf life because they do not provide the same reliable oxygen and moisture barrier as aluminum.

[0008] In particular, designing extraction surfaces with alternative materials appears challenging because it is not possible to simply transfer the design principles and solutions applied to aluminum extraction surfaces to these new materials. For example, simply replacing known aluminum-based extraction surfaces with paper-based materials has proven unsuccessful, as the quality, flavor reproducibility, and consistency of the resulting beverages are incomparable to the high standards set by known aluminum-based extraction surfaces.

[0009] Additionally, even if some attempts to offer alternative compostable capsules begin to succeed, the structure and design of the capsule cap membrane remains a challenge, as the capsule membrane needs to meet several requirements. In fact, the capsule cap membrane should:

[0010] - It is fully biodegradable and / or compostable.

[0011] - It has optimal barrier properties to extend the shelf life of the capsule contents.

[0012] - It is tightly sealed with high sealing strength to the edge of the capsule.

[0013] - Resistant to air transport and, especially under tropical conditions, does not detach or separate from the capsule body.

[0014] - It has a structure and related materials that allow the capsule to be opened by an opening mechanism through a beverage preparation machine during the capsule opening process.

[0015] - Maintains pressure inside the beverage extraction machine, preventing breakage and separation during extraction, and

[0016] - Provides optimized extraction.

[0017] Therefore, the object of the present invention is to provide a capsule whose configuration and design facilitate the use of compostable material throughout the capsule, while maintaining and / or exceeding the quality and consistency standards of the prepared beverage set by the capsule itself and by comparable aluminum capsules, particularly having an improved top cap membrane as a delivery wall for the beverage to be delivered during extraction.

[0018] These and other objectives, which become apparent upon reading the description, will be addressed by the subject matter of the independent claims. The dependent claims relate to preferred embodiments of the invention. Summary of the Invention

[0019] As used herein, the terms "machine" or "apparatus" may refer to an electrically operated device or machine that can: prepare beverages and / or food from precursor materials or ingredients, or prepare precursor materials from pre-precursor materials that can subsequently be prepared into beverages and / or food. The machine can perform the preparation through one or more of the following processes: dilution; heating; pressurization; cooling; mixing; stirring; dissolving; soaking; macerating; extraction; conditioning; brewing; grinding; and other similar processes. The dimensions of the machine may be set for use on a workbench; for example, the length, width, and height of the machine may be less than 70 cm. As used herein, the term "preparation" with respect to beverages and / or food may refer to the preparation of at least a portion of a beverage and / or food (e.g., the beverage is entirely or partially prepared by the machine, or additional fluids, including milk and / or water, may be manually added to the beverage by the end user before consumption). As a preferred embodiment of the present invention, the beverage extraction device is a Nespresso Original Line extractor as described in, for example, one or more of EP0512468A1, EP0512470A1, EP1654966A1 or EP2142054A1.

[0020] For example, one or more of EP0512468A1, EP0512470A1, EP1646305A1 or EP1165398A1 discloses Nespresso when used with capsules made of aluminum. ® The original line system, along with its opening system, is also disclosed in these references. Details of the construction, manufacture, and / or (beverage) extraction of such aluminum capsules and / or closure components are also disclosed.

[0021] In such a system, the capsule is designed to be inserted into an extraction device, in which the capsule can be punctured and fluid injected through a coffee bed housed within the capsule. The capsule then opens against a support portion of a device comprising protruding elements (in the form of truncated pyramids) under the pressure of the fluid entering and rising within it.

[0022] As used herein, the term "container" or "capsule" may refer to any configuration that contains precursor material (e.g., as a single, pre-quantified portion). A container may have a maximum capacity such that it can hold only a single portion of precursor material. A container may be single-use, for example, physically altered after a preparation process that may include one or more of the following: perforation to supply a fluid, such as a liquid like water, to the precursor material; perforation to supply a beverage / food from the container; or opening by a user to extract the precursor material. A container may be configured to operate with a container handling unit of a machine; for example, the container may include flanges for aligning and guiding the container through said unit or arranged on said unit. A container may include a rupture portion arranged to rupture upon exposure to a specific pressure to deliver a beverage / food. A container may have a diaphragm for sealing the container. Containers may have various forms, including one or more of the following: truncated conical; cylindrical; disc-shaped; hemispherical; and other similar forms. The container can be formed from various materials, such as metal or plastic or combinations thereof with wood pulp. Preferably, the container is a compostable capsule, preferably made of cellulose, and preferably formed as a cellulose or wood pulp molded capsule. The material can be selected such that it is: food-safe; and can withstand the pressure and / or temperature of the preparation process. The container can be defined as a capsule, wherein the capsule can have an internal volume of 20 ml to 100 ml. The capsule includes coffee capsules, for example, Nespresso. ® Capsules (including Classic / Original Line, Professional or other capsules).

[0023] As used herein, the term "system" or "beverage or food preparation system" may refer to any combination of two or more of the following: beverage or food preparation machinery; containers; server systems; and peripheral devices.

[0024] As used herein, the term "beverage" can refer to any substance that can be processed into a form suitable for drinking, which may be iced or hot. A beverage can be one or more of the following: solid; liquid; gel; paste. A beverage may include one or a combination of the following: tea; coffee; hot chocolate; milk; liqueur; vitamin compositions; herbal tea / infusion; brewed water / flavored water; and other substances. As used herein, the term "food" can refer to any substance that can be processed into a nutritious substance for consumption, which may be iced or hot. Food can be one or more of the following: solid; liquid; gel; paste. Food may include yogurt; mousse; parfait; soup; ice cream; sorbet; custard; smoothie; and other substances. It should be understood that there is some overlap between the definitions of beverage and food; for example, a beverage can also be a food, and therefore the machine described for preparing a beverage or food does not preclude the preparation of both. Preferably, the beverage is coffee, including roasted and ground coffee.

[0025] As used herein, the terms "precursor material" or "ingredient" can refer to any material that can be processed to form part or all of a beverage or food. Precursor materials can be one or more of the following: powder; crystalline; liquid form; gel; solid; and others. Examples of beverages that form precursor materials include: ground coffee; milk powder; tea leaves; cocoa powder; vitamin compositions; herbs, such as those used to form herbal / infused teas; flavorings; and other similar materials. Examples of foods that form precursor materials include dried vegetables or broths as anhydrous soup powders; powdered milk; flour-based powders, including custard; powdered yogurt or ice cream; and other similar materials. Precursor material can also refer to any pre-precursor material that can be processed into a precursor material as defined above, i.e., any precursor material that can be subsequently processed into a beverage and / or food. In examples, pre-precursor materials include coffee beans that can be ground and / or heated (e.g., roasted) into precursor materials. Preferably, in the disclosed extraction process, the precursor material is roasted and ground coffee.

[0026] As used herein, the term "fluid" (as opposed to fluid supplied by a fluid conditioning system) may include one or more of the following: liquid, such as water; milk; others.

[0027] As used herein, the term "wood pulp-based" can refer to a material or part of a material forming a container, which is one or more of the following: porous; fibrous; cellulose; formed of cellulose material; formed of natural cellulose material; formed of reconstituted or regenerated cellulose material; nonwoven; consisting entirely of wood pulp or a composition of wood pulp, and formed by wet or dry processes. The thickness of the wood-based material can be from 0.25 mm to 0.75 mm, or about 0.5 mm. The wood-based material can be from 200 gsm to 400 gsm.

[0028] As used herein, the term "nonwoven" can refer to nonwoven or knitted woven fabrics. Nonwoven materials can be made of fibers bonded together. As used herein, the term "porous" can refer to a material constructed with pores to allow water (or other liquids) to pass through. As used herein, the term "fibrous" can refer to a material composed of fibers, which can be present in one or more material compositions.

[0029] As used herein, the terms “cellulose-based,” “cellulose-based,” or “cellulose material” can refer to conventional woody materials (from softwood and / or hardwood species) and / or non-woody materials. These materials can be bleached and unbleached and may include regenerated or reconstituted cellulose. Examples of softwoods are pine, spruce, redwood, etc. Examples of hardwood cellulose-based materials are maple, oak, ash, eucalyptus, maple, birch, walnut, beech, etc. Examples of non-woody cellulose-based materials are rice, Manila hemp, sisal, jute, bamboo, corn, sugarcane, sugarcane bagasse (bagasse), banana peel, and coffee powder.

[0030] As used herein, the term "natural cellulose material" may refer to conventional wood-based or non-wood-based materials that are not recycled. As used herein, the term "reconstructed or recycled cellulose material" may refer to natural cellulose materials that have undergone treatment (including reconstruction or recycling), examples of which include rayon and lyocell fiber.

[0031] As used herein, the term "wood pulp" can refer to lignocellulosic cellulose fibrous materials, which can be prepared by mechanically or chemically separating cellulose fibers from one or more of wood, fiber crops, paper, or rags. As used herein, the term "wet forming" can refer to a process formed from an aqueous solution of fibers. The aqueous solution of fibers can be heated and pressed in a mold to shape the material and remove water from it. As used herein, the term "dry forming" can refer to a process formed without using an aqueous solution of fibers.

[0032] The capsules of this invention have the same properties as Nespresso. ® The capsule shares the same design as the Original Line capsule and is made entirely of compostable material (capsule body and delivery wall), preferably of cellulose-based material, and more preferably of pulp-molded cellulose-based material. The capsule is in the form of a truncated conical cup and has, for example, a diameter of 2 cm to 5 cm and an axial length of 2 cm to 4 cm.

[0033] In variant embodiments not illustrated: the capsule may have other cross-sectional shapes, including square, other polygonal, or elliptical; the flange or edge portion is alternatively connected to the upper surface of the closure member, for example, by curling; the sidewalls are alternatively arranged, including having an inverted tapered shape or aligned with the depth direction, or being curved; the base is alternatively arranged, including being flat or curved; the flange or edge portion is connected to the storage portion rather than being integrally formed; the closure member is arranged as the storage portion, for example, it includes a cavity; and the flange portion is omitted, for example, the closure member is directly connected to the storage portion.

[0034] A first aspect of the invention relates to a capsule for preparing a beverage in a beverage production machine. In these aspects, the invention provides a capsule according to claim 1.

[0035] More specifically, a capsule can be understood as a container or vessel for containing a substance for preparing a beverage, and preferably can form a shell or container surrounding the substance.

[0036] The capsule body has a three-dimensional shape. The capsule body defines a chamber (at least partially) with its sidewalls, which can be, for example, a compartment, cavity, or hollow space within a capsule. This chamber typically contains beverage or food ingredients or substances used to prepare a beverage. The capsule body also includes edge portions defining openings in the sidewalls. The capsule also includes an injection wall that closes the chamber at one end of the sidewall and is adapted to inject fluid into the chamber. The injection of fluid can result in an interaction between the fluid and the substance, which can include any kind of chemical and / or physical reaction between the substance and the fluid, such as wetting, infusion, extraction, dissolution, and / or any other corresponding interaction, to produce a beverage product. The capsule also includes a delivery wall connected to the capsule body to close the chamber. For example, it is conceivable that the space inside the capsule can be (completely) surrounded from all sides by the capsule body (sidewalls), the injection wall, and the delivery wall, preferably forming (and closing) a chamber for receiving the substance. Thus, capsules can be provided that can be filled with substances for preparing a beverage and used with known capsule machines. The substance is protected from degradation and external factors such as oxidation or moisture, and its flavor is preserved inside the capsule even during long-term storage.

[0037] The delivery wall of the present invention is made of a biodegradable material and comprises, in a layered manner and in this specific order (from the side opposite to the capsule to the side facing the capsule), a filter layer, a carrier layer, a barrier layer, a protective layer, and a connecting layer for connection to the capsule body. Therefore, the delivery wall may include different portions arranged as sheets, strips, layers, or as layers. Thus, the delivery wall can be provided with any number of layers, each layer providing a desired functionality, such as, for example, an adhesive layer for bonding one or more layers, and / or for purifying and / or screening certain particles or contents from the prepared beverage before it leaves the capsule (chamber), such as using a filter layer. The delivery wall can have various (layer) configurations, forms, and shapes.

[0038] A filter layer is configured to filter particulate matter from a prepared beverage dispensed via a delivery wall. The filter layer is positioned away from the chamber within the delivery wall. The filter layer is made of biodegradable and / or compostable materials.

[0039] The carrier layer (also known as the retaining layer) of the delivery wall can be configured such that it opens upon interaction with the opening element of the capsule retainer (of a beverage production machine's capsule chamber) under pressure increases within the capsule and / or under pressure increases of the fluid injected into the capsule, for example, through relative movement between the respective elements. The opening element can have various configurations, forms, and shapes, and may include multiple protruding and recessed elements, such as pyramidal elements. This design allows for customization of the delivery wall design according to technical requirements. Similarly, the carrier layer is made of biodegradable and / or compostable materials.

[0040] As mentioned, each of the filter layer and the carrier layer is made of a biodegradable, preferably compostable, material. This could lead to more direct recycling of the organic material inside the capsule, as well as the capsule material itself.

[0041] The barrier layer is also made of a biodegradable material. The barrier layer provides preferred two-way barrier against moisture and / or gases, and is preferably made of a material different from the filter layer and / or carrier layer; the barrier layer is applied to the chamber-facing surface of the carrier layer.

[0042] In the proposed solution, the barrier properties preferably prevent moisture and / or liquid and / or gaseous substances, and preferably prevent oxygen from entering and / or leaving the room.

[0043] It is proposed that the barrier layer is preferably made of a different material from the filter layer and / or carrier layer, because the intended physicochemical properties of the barrier layer are to protect the material encapsulated in the chamber from moisture and / or oxygen, rather than any filtering or retaining properties.

[0044] Preferably, each of the filter layer, barrier layer, and carrier layer is made of a different biodegradable and preferably compostable material, wherein preferably, the different materials are distinguished by at least one of their respective physical properties, such as tensile strength, ductility, elasticity, puncture resistance, density, porosity, and / or (if applicable) fiber structure and / or fiber orientation.

[0045] The term "biodegradable material" can be understood as any material that can be broken down into environmentally harmless products by biological processes (such as microorganisms, like bacteria, fungi, or algae). This process can be carried out in an environment with or without oxygen (aerobic). This can be understood, for example, to mean that composting can be carried out without any residue. Specifically, at the end of the composting process, there are no residues of materials that could cause environmental problems, or any non-biodegradable components.

[0046] Examples of biodegradable materials used for the carrier layer or filter layer can be various plant-based materials, such as wood, bamboo, bamboo fiber, cellulose, cellulose pulp, wood pulp, sugarcane pulp, paper, and / or paperboard. Additionally, the family of bioplastics (such as biopolymers) such as polyhydroxybutyrate (PHB) and copolymers, polybutylene succinate (PBS), poly(butylene succinate-co-butylene adipate) (PBS-A / PBSa), polylactic acid (PLA), polybutylene adipate-terephthalate (PBAT), cellulose acetate, starch, and / or complexes or combinations thereof are other examples.

[0047] International standards (e.g., EU 13432 or US ASTM D6400) specify the technical requirements and procedures for determining the compostability of materials. Biodegradability can be tested according to standards such as ISO 14855, ISO 17556, or ISO 14851. For example, one of these tests requires (in order to be considered "industrially compostable") that at least 90% of the material under consideration be biodegraded within 6 months under controlled conditions. Similar tests also exist for achieving home compost certification.

[0048] According to the present invention and as previously mentioned, the delivery wall also includes at least one protective layer and a connecting layer.

[0049] A protective layer is applied to the side of the barrier layer facing the capsule chamber to protect the barrier layer from moisture.

[0050] A connecting layer is applied over the protective layer and forms the outer layer of the delivery wall facing the chamber. The connecting layer allows the delivery wall to be attached to the edge portion of the capsule body.

[0051] Similarly, like the filter layer, carrier layer, and barrier layer, the connecting layer is made of biodegradable material, thus contributing to the biodegradability of the entire structure.

[0052] In addition, the connecting layer comprises at least a nonwoven aliphatic or aliphatic aromatic polyester selected from the list of materials including: polylactic acid (PLA), polyhydroxyalkanoate (PHA), polybutylene succinate (PBS), polybutylene succinate-co-adipate (PBSA), polybutylene adipate-co-terephthalate (PBAT), polybutylene sebacate-co-terephthalate (PBSeT), and their respective copolymers and combinations thereof.

[0053] The proposed structure has the following advantages: it provides an increased amount of material for connecting to the edge portion of the capsule body to improve the seal of the delivery wall on the capsule body, while the total thickness of the delivery wall is managed to allow it to be opened during capsule extraction in a beverage preparation machine due to the use of nonwoven material.

[0054] The materials proposed for the connecting layer are not defined as having adhesive properties. However, when (sealed) onto the edge portions of the capsule body, these materials provide a high-strength and efficient connection of the delivery wall to the capsule body.

[0055] As a proposed feature, the connecting layer has a density between 30 g / m². 2 and 180g / m 2 Between, preferably between 35g / m 2 and 120g / m 2 The weight between.

[0056] The amount of material typically used when heat-sealing varnish or heat-sealable coating is between 10 g / m³ and the amount used when joining the delivery wall and capsule body is typically between 10 g / m³. 2 and 20g / m 2 Between these two methods, the amount of material in the proposed connecting layer is important, as it provides a seal on the capsule while still allowing the delivery membrane to be opened during extraction.

[0057] The connecting layer of the delivery wall is preferably sealed to the edge portion of the capsule body by heat sealing or ultrasonic sealing. Combining the sealing technology with a higher quantity of material available for sealing allows for increased seal strength between the delivery wall and the capsule body. Utilizing the proposed materials and sealing technology for the connecting layer, the connection between these two elements can withstand air transport and tropical conditions.

[0058] Depending on the additional features, the capsule body and preferably the injection wall include a barrier-like, layered and / or laminated protective film extending to the edge portion of the capsule body, to which the bonding layer of the delivery wall is sealed. The protective film may be in the form of a liner structure or a coating (applied in one or more layers). Protective films in the form of multilayered, biodegradable structures comprising polymers (also known as liner) may be used. Examples of such protective films are disclosed in WO 2021 / 145764.

[0059] The bonding layer and protective film are then sealed together, and their respective materials are locally melted and mixed to provide a high-strength bond.

[0060] For the proposed material used for the connecting layer, the sealing strength of the delivery wall on the edge portion of the capsule body, including the protective membrane, is at least 6 N / 15 mm, measured according to ASTM F88 / F88M-21, a standard test method for the sealing strength of flexible barrier materials.

[0061] Compared to currently available compostable cellulose-based capsule solutions that use heat-sealing varnish for the delivery wall / cup body connection, the seal strength between the delivery wall and the capsule body is improved.

[0062] During the attachment of the delivery wall to the capsule body, the seal between the attachment layer and the edge portion is limited to the peripheral portion of the attachment layer. Therefore, once attached, two regions can be defined on the attachment layer:

[0063] - A first region, located at the periphery of the connecting layer and corresponding to the portion sealed to the protective film laminated or thermoformed onto the capsule body, wherein the connection between the first region and the capsule body is improved, and

[0064] - The second region corresponds to the unsealed portion of the connecting layer. Due to the nonwoven structure of the material, this second region still allows the delivery wall to be opened despite the thickness of the connecting layer.

[0065] The proposed delivery wall structure with an integrated nonwoven connecting layer combines improved sealing strength between the delivery wall and the capsule body with a larger thickness of the connecting layer, while still achieving optimized opening of the delivery wall despite the thickness of the connecting layer.

[0066] The proposed method involves obtaining the bonding layer via spunbonding, meltblowing, or short fiber processes, and applying it to the delivery wall via lamination during the production of the delivery wall. This allows for controlled production and precise application to the delivery wall.

[0067] Preferably, the bonding layer is obtained using a spunbond manufacturing process that allows for nonwoven structures with controlled material density and thickness.

[0068] Furthermore, the delivery wall also includes at least one adhesive layer positioned between the protective layer and the connecting layer to ensure optimal adhesion of the connecting layer to the protective layer. Similarly, the adhesive layer helps protect the barrier layer during the lamination of the connecting layer onto the delivery wall structure.

[0069] The proposed feature is that the adhesive layer, like the other layers of the delivery wall, is biodegradable. This adhesive layer may specifically comprise materials such as plant-based starch or acrylic adhesive polymers.

[0070] According to another possible feature, the filter layer is made of compostable nonwoven material, preferably made of cellulose fibers, such as wood fibers or non-wood fibers or sugarcane pulp.

[0071] Alternatively, materials may be rayon fibers, aliphatic or aliphatic aromatic polyesters selected from the list including the following materials: polylactic acid (PLA), polyhydroxyalkanoate (PHA), polybutylene succinate (PBS), polybutylene succinate-co-adipate (PBSA), polybutylene adipate-co-terephthalate (PBAT), polybutylene sebacate-co-terephthalate (PBSeT), and their respective copolymers and combinations thereof.

[0072] The filter layer has a density between 10 g / m 2 and 150g / m 2 Between, preferably between 20 g / m 2 and 100g / m 2 The weight between.

[0073] The filter layer has a density of between 10 g / m 2 and 150g / m 2 Between, preferably between 20 g / m 2 and 100g / m 2 The weight between these parameters allows for efficient filtration of any particles from the material encapsulated in the capsule chamber, such as roasted and ground coffee.

[0074] Therefore, the properties of a filter layer can be defined by limiting the areal density of its material, i.e., the mass per unit area. For example, the tensile strength of the filter layer can be improved by increasing the basis weight of its material and / or by using a (non-woven) material comprising fibers of a defined length and / or with defined fiber bonding strength. Furthermore, by appropriately setting the material properties of the filter layer, the filtration capacity and / or porosity of the filter layer can be modified, for example, by reducing it to a smaller particle size. Thus, a filter layer can be customized to meet the specific requirements of beverage preparation.

[0075] According to additional features, the carrier layer is made of a biodegradable and compostable material having a defined closed fibrous structure, wherein at least 50% by weight comprises paper, cork, hardwood, or non-wood materials, or combinations thereof. In a preferred embodiment, the carrier layer is made of a paper-based material.

[0076] When the carrier layer is cellulose-based, it can have a strength between 20 g / m³. 2 and 150g / m 2 Between, preferably between 30g / m 2 and 100g / m 2 The weight between.

[0077] Alternatively, the closed fiber structure corresponds to polyhydroxyalkanoates (PHA), polyhydroxybutyrates (PHB) and copolymers, polybutylene succinate (PBS / PBS-A), biopolyesters, cellulose acetate, starch, polyvinyl alcohol (PVOH), polymers or copolymers of which at least one monomer unit is ethylene alcohol, composites and / or laminates of the above materials.

[0078] According to the use of the capsule in a beverage preparation machine that can feed a certain amount of fluid into the capsule under pressure, the carrier layer (preferably the material of the carrier layer) is configured such that it resists the accumulation pressure in the chamber between 1 bar and 20 bar, more preferably between 10 bar and 20 bar, and most preferably between 12 bar and 18 bar.

[0079] The properties of the carrier layer can be adjusted as needed. For example, the tensile strength of the carrier layer can be increased by increasing the basis weight of its material.

[0080] In a preferred embodiment, the filter layer is positioned opposite the carrier layer to the chamber. This specific order and orientation of the carrier and filter layers relative to the capsule body results in numerous improvements. For example, a more consistent and reproducible pressure distribution can be observed during beverage preparation. Furthermore, this configuration is found to result in better crema formation and extraction in beverages, and a lower concentration of particulate matter and residues of substances such as roasted and ground coffee.

[0081] As can be seen from the above, the carrier layer can face the room, or it can be set closer to the room than the filter layer. For example, the expression "facing" can be understood as pointing to the corresponding reference object, rather than being directly set on the corresponding reference object.

[0082] As mentioned, the delivery wall also includes a barrier layer. The barrier layer provides a preferred two-way barrier against moisture and / or oxygen and is made of a biodegradable (preferably compostable) material, such as a biopolymer, polyglycolic acid (PGA), polyvinyl alcohol (PVOH), butanediol-vinyl alcohol copolymer (BVOH), or any vinyl alcohol copolymer in which at least one monomer unit is vinyl alcohol, as well as composites or laminates of the above materials.

[0083] Preferably, the barrier layer is made of a different material than the filter layer and / or the carrier layer. This allows for the benefit of the different material properties of both the filter layer and the carrier layer.

[0084] The barrier layer has a density of 2 gsm (g / m 2 ) to 50 gsm (g / m 2 ), preferably 5 gsm (g / m 2 ) to 40 gsm (g / m 2 The total amount of barrier layer is applied in one or more layers. The proposed total amount of barrier layer allows for sufficient barrier material to provide a barrier effect.

[0085] As proposed, a barrier layer is applied to the chamber-facing surface of the carrier layer.

[0086] As an option and to improve the OTR performance of the delivery wall, the surface of the carrier layer to which the barrier layer is applied preferably has a surface roughness of less than 1.3 micrometers when measured according to ISO 3274. Oxygen permeability (OTR) is a measurement of the amount of oxygen that passes through a substance over a given period of time. It is primarily performed on non-porous materials where the transport mode is diffusion. In the case of this invention, it relates to oxygen permeating through the packaging material (delivery wall) into sensitive foods such as coffee. The OTR measurement method uses ASTM D3985 / ISO 15105, where a typical measurement test area is 50 cm², and the analysis conditions are 23°C and 50% relative humidity. Surface roughness (often simply referred to as roughness) is a component of surface texture. It is quantified by the deviation of the normal vector direction of the actual surface from its ideal form. Roughness measurement can be performed using surface profilometry. In the case of this invention, this is accomplished using a contact or stylus profilometer (such as Smithers' portable Handysurf E-35B), which moves a loaded diamond probe across the surface and records the vertical movement of the stylus caused by surface irregularities. The sample is measured 15 times. Controlling the surface roughness of the carrier layer before applying the barrier layer ensures regular application of the barrier layer on material surfaces with more closed pores, thereby improving the barrier layer properties, especially OTR performance.

[0087] Therefore, for the proposed delivery wall structure comprising a filter layer, a carrier layer, and a barrier layer made of the previously proposed materials, the oxygen permeability (OTR) of the delivery wall (300) is less than 35 cc / m. 2 / day, preferably less than 10cc / m 2 / day, preferably less than 1cc / m 2 / day, the oxygen permeability is measured according to the ASTM D3985 / ISO 15105 method.

[0088] Controlled surface roughness, combined with the total amount of barrier material applied to the carrier layer, allows for improved OTR performance of the delivery wall by reducing the OTR value. This results in denser capsules.

[0089] According to another feature, one or more protective layers are applied directly to the surface of the barrier layer facing the capsule chamber. The protective layer is at 5 gsm (g / m²). 2 ) to 30 gsm (g / m 2 Preferably, it is between 5 gsm (g / m³) 2 ) and 20gsm (g / m 2 The total amount between ) is applied with one or more protective layers, and has a maximum total thickness of 20 micrometers.

[0090] The proposed protective layer ensures protection of the barrier layer, thereby guaranteeing complete protection of the barrier layer during the application of additional layers to the delivery wall and against moisture (barrier layers are typically sensitive to moisture).

[0091] The protective layer is made of biodegradable and preferably compostable materials, such as plant starch-based adhesives, protein-based adhesives, natural rubber-based adhesives, aqueous dispersions of polyester and / or polyurethane elastomers, or acrylic polymers and copolymers, and / or combinations thereof.

[0092] Furthermore, the protective layer is preferably non-water-soluble to prevent degradation by the moisture content of the substances encapsulated within the chamber. The protective layer is also preferably made of a different material than the filter layer and / or carrier layer to ensure proper separation of the physicochemical properties of the different layers.

[0093] The improved delivery wall structure, achieved by applying a protective layer (one or more layers), results in a delivery wall OTR value of less than 10 cc / m. 2 / day, and preferably less than 1cc / m 2 / sky.

[0094] Controlled surface roughness, a limited total amount of barrier material applied to the carrier layer, and the application of one or more protective layers allow for further improvement in the OTR performance of the delivery wall.

[0095] The proposed delivery wall, with its improved OTR performance and sealing strength properties, helps to increase protection for the material (typically roasted and ground coffee) filled in the capsule chamber, thereby extending the shelf life of the capsule itself to benefit consumers.

[0096] As an option, the delivery wall also includes an adhesive layer that allows the filter layer and the carrier layer to be at least partially joined together on their opposite sides, preferably by adhesive bonding or heat sealing.

[0097] Specifically, an adhesive layer is disposed between the carrier layer and the filter layer to ensure efficient adhesion of the two layers.

[0098] The adhesive layer is made of a biodegradable and preferably compostable material (such as plant-based starch or acrylic adhesive) and contributes to the biodegradable properties of the entire capsule.

[0099] Preferably, the different layers forming the delivery wall, namely the filter layer, adhesive layer, carrier layer, barrier layer, protective layer, binder layer, and connecting layer, are made of different biodegradable, preferably compostable, materials, and these layers may each be formed in one or more layers.

[0100] In addition to the above, the delivery wall may include additional layers besides the filter layer, carrier layer, and adhesive layer. These additional layers may be inserted between the filter layer, carrier layer, and adhesive layer as needed and according to their function.

[0101] The different layers are preferably made of different materials, which are preferably distinguished in terms of at least one of their respective physical properties, such as tensile strength, ductility, elasticity, puncture resistance, density, porosity, and / or (if applicable) fiber structure and / or fiber orientation.

[0102] The delivery wall can be provided as a composite structure by providing at least the aforementioned carrier layer, filter layer, and barrier layer from different materials. However, it is also conceivable that the delivery wall may comprise multiple different layers, preferably made of different materials. This can lead to the advantageous effect that a combination of two or more constituent materials with different physical or chemical properties produces a structure with properties different from each of the individual components. Therefore, the interface between the capsule and the outside can be customized according to the technical requirements of the application. For example, by providing different tensile strengths to each layer, the pressure accumulated inside the capsule can be controlled and limited as needed. Thus, for example, the capsule can be designed to produce a beverage according to the specifications of its formulation. Furthermore, by providing two layers from materials with different fiber configurations, material properties related to the interaction between the delivery wall and the prepared beverage can be customized for individual applications, such as limiting the filtering capacity of the delivery wall. Moreover, differences in the orientation of the individual layers of the delivery wall can result in different stresses within the layers, which can be considered by selecting different materials for the aforementioned configuration. For example, the material of one layer may rupture under lower pressure than the material of another layer, but the structure can be held together by the combined resistance of each material, which can support each other under pressure.

[0103] Specifically, one or more of the different layers of the delivery wall, namely the filter layer, adhesive layer, carrier layer, barrier layer, protective layer, bonding layer, and connecting layer, are laminated together with other layers of the delivery wall. Due to the lamination of one or more of the aforementioned layers, a blank foil that is cut or stamped to form the delivery wall can be produced. Depending on the size of the blank, several delivery walls can be formed from the same blank.

[0104] As mentioned, the proposed capsule body and preferably the injection wall are preferably made of molded pulp fibers and include a layered and / or laminated protective film.

[0105] In the proposed solution, the capsule body and injection wall are constructed as separate parts, or integrally formed, for example, as one piece. This opens up different manufacturing options for the capsule body and / or injection wall.

[0106] Another aspect of the invention relates to a system for preparing a beverage, the system comprising containing beverage ingredients (preferably roasted and ground coffee) and capsules as described above, as well as a beverage production machine.

[0107] The proposed system utilizes a beverage production machine having a fluid dispensing device and a brewing chamber. The fluid dispensing device is capable of supplying a certain amount of fluid (such as water) to the capsule at a pressure between 2 bar and 20 bar at a first end formed by the injection wall. The brewing chamber includes a first component for receiving the capsule and a second component for closing the brewing chamber. The second component of the brewing chamber includes a capsule holder with an opening structure (having an opening element) for engaging with the capsule's delivery wall at a second end of the sidewall when the brewing chamber holding the capsule is closed. The opening structure includes a surface with protrusions and recesses facing the delivery wall (preferably the capsule's filter layer) in use.

[0108] According to the proposed implementation, when used in a closed brewing chamber, the delivery wall opens with reduced tearing due to the raised and recessed surfaces of the opening structure, compared to capsules that include aluminum delivery walls.

[0109] An additional aspect of the invention relates to the use of the capsules described above for preparing beverages in a beverage production machine having a capsule holder. Thus, beverages can be prepared in an advantageous and ecologically beneficial manner. Attached Figure Description

[0110] The invention is further described with reference to the following examples. It should be understood that the invention protected by the claims is not intended to be limited in any way by these embodiments.

[0111] Embodiments of the present invention will now be described by way of example with reference to the following accompanying drawings, in which:

[0112] - Figure 1 A schematic exploded view of a capsule according to an embodiment of the present invention is shown.

[0113] - Figure 2 It shows Figure 1 An enlarged schematic cross-section of a portion of the delivery wall of the capsule, showing the different layers of the delivery wall.

[0114] - Figure 3 The present invention integrates... Figure 2 A detailed view of another embodiment of the capsule with a delivery wall. Detailed Implementation

[0115] As used in this specification, the words “including,” “contains,” and similar terms should not be construed as having an exclusive or exhaustive meaning. In other words, these terms are intended to mean “including but not limited to.”

[0116] Any references to prior art documents in this specification should not be construed as an admission that such prior art is well-known or constitutes part of common general knowledge in the art.

[0117] The accompanying drawings illustrate different views, aspects, and features of the capsule 100 and related components of the present invention for preparing beverages in a beverage production machine, according to the present invention. Figure 1 An exploded view of a schematic capsule according to an embodiment of the present invention is shown, while Figure 3 A detailed design of another embodiment of the capsule of the present invention is shown, and Figure 2 The detailed layered structure of the delivery wall of the capsule of the proposed invention is shown in schematic cross-section.

[0118] Capsule 100 may have a composite structure and / or may be made of a composite material, which is preferably composed entirely of biodegradable and / or compostable materials.

[0119] Capsule 100 includes a capsule body 200 having a three-dimensional shape with sidewalls 210. The capsule body 200 can have any shape or form; for example, the capsule body can be in the form of a cup-shaped body. For example, the capsule body 200 can have features suitable for inserting the capsule 100 into a (known) beverage production machine (e.g., Nespresso). ® The capsule body 200 is in the form of a capsule holder in a beverage production machine. The capsule body 200 may have a truncated conical, truncated apex, cup, or bowl shape. The capsule body 200 may have a circular cross-section. Therefore, for example, it can absorb pressure-related forces applied to the capsule body 200.

[0120] The capsule body 200 includes sidewalls 210. The sidewalls 210 define a chamber 250 inside the capsule 100. The sidewalls 210 can be configured such that they enclose a continuous space inside the capsule body 100. This is in Figure 1 As exemplarily shown in the figure.

[0121] Chamber 250 is arranged to receive and store substance 500 for the preparation of beverages. Substance 500 can be any type of article (solid, liquid, at least partially soluble, and / or permeable) having a specific or defined chemical composition. Examples of substance 500 can be roasted and ground coffee, instant coffee, tea leaves, syrup concentrates, fruit extract concentrates, chocolate products, dehydrated edible substances, and / or combinations thereof, depending on the extraction process in which they are prepared. Therefore, examples of beverages that can be prepared can be coffee-based or chocolate-based beverages, or other similar types of food. However, the above examples of substance 500 and beverages are not to be considered an exhaustive list. Rather, various other examples are contemplated.

[0122] The capsule body 200 may have an opening 230 leading to a chamber 250. The opening 230 may be at at least one of the opposite ends of the capsule body 200. For example, substance 500 may be filled into the capsule 100 through the opening 230. The substance 500 may completely fill the chamber 250. However, a free space may exist between the opening 230 and the level of filling of the substance 500, which may be filled with an inert gas to keep the substance 500 fresh. Preferably, an edge portion 211 of the sidewall 210 may define the opening 230. The edge portion 211 may be in the form of a flange and extend from the sidewall 210, preferably away from the chamber 250. In operation, the capsule 100 may be placed on the edge portion 211 inside a capsule holder of a beverage production machine.

[0123] The sidewall 210 may be configured such that it forms a continuous covering surface of the capsule body 200. For example, the sidewall 210 may have an inner surface facing the chamber 250 and an outer surface facing away from the chamber 250.

[0124] A protective film 400 may be provided on the capsule body 200 and / or sidewalls 210, which serves to provide a preferred bidirectional barrier against moisture and / or oxygen for the substance 500. Figure 1 In this embodiment, the protective film 400 is exemplarily illustrated as a lining disposed on the inner surface of the sidewall 210, the lining extending to and over the edge portion 211. The protective film 400 may additionally or alternatively be disposed on the outer surface of the sidewall 210. Additionally or alternatively, the protective film may be provided as a coating having similar barrier properties. The protective film 400 may be made of a biodegradable and preferably compostable material, such as biopolymers or families of bioplastics, such as PHA and copolymers (including PHB), PBS, PBS-A, PLA, PBAT, cellulose acetate, starch, PGA, PVOH, and may include any polymer or copolymer in which at least one monomer unit is vinyl alcohol (e.g., BVOH, butene glycol vinyl alcohol), and any composites or laminates of the aforementioned materials. Preferably, the protective film 400 may be made of food-safe materials (FCS, FCM).

[0125] For example, the capsule body 200 may be made of (wet / dry) molded pulp fibers. Preferably, the capsule body 200 may be made of biodegradable and / or compostable materials. The capsule body 200 may be made of food-safe materials (FCS, FCM). The capsule body 200 may include a layered and / or laminated structure. For example, the capsule body 200 may be relatively rigid or stiff, so as not to collapse during operation in a beverage production machine or during storage. Layered and / or laminated designs can provide additional rigidity and / or stiffness to the capsule body 200 compared to other designs. The molded pulp fibers may be a composite material having an additional substrate (such as a biodegradable resin) laminated onto the capsule body 200. For example, the laminated structure of the capsule body 200 may be formed by providing a protective film 400 thereon. However, it is also contemplated that, for example, in addition to the protective film 400, the capsule body 200 may include, for example, additional laminated films or layers.

[0126] Alternatively, the capsule body 200 may be made of a paper-based material or a paper-based material having a laminate, the paper-based material being specially shaped to define the chamber 250.

[0127] In the case of the present invention, the capsule body 200 is made of cellulose-based pulp molding material, preferably wood pulp material using a wet pulp molding process.

[0128] Capsule 100 includes an injection wall 220 for injecting fluid into chamber 250 to prepare a beverage as the fluid interacts with substance 500. This is in Figure 1 The example is illustrated below.

[0129] Injection wall 220 may be disposed on the end of capsule body 200 opposite to opening 230. Injection wall 220 may be integrally or separately disposed with capsule body 200. Thus, capsule body 200 and injection wall 220 may be constituted as separate pieces or may be integrally formed as one piece. Injection wall 220 may form the tapered end portion of capsule body 200. Injection wall 220 may be configured to be perforated by blades of a coffee-making machine, such that the blades provide openings for fluid injection. Preferably, the fluid may be a liquid or a liquid / gas mixture, such as water or milk. Like capsule body 200, injection wall 220 may also include the aforementioned protective membrane 400. It is also contemplated that injection wall 220 may include (small) openings through which blades of the coffee-making machine can enter and puncture protective membrane 400. Similar to capsule body 200, injection wall 220 may include a layered and / or laminated structure and may be made of (laminated) molded pulp fibers and / or food-safe materials (FCS, FCM).

[0130] The capsule body 200 and injection wall 220 may be configured such that the chamber 250 is preferably closed (sealed) from at least three sides, such as Figure 1 As shown. The capsule body 200 and injection wall 220 can be configured such that the injected fluid is uniformly dispersed in the chamber 250 along the sidewall 210.

[0131] Figure 3 The document presents an alternative and detailed capsule body 200, in which, in addition to the integrally molded injection wall 220 and edge portion 211, the capsule also includes a tapered sidewall 210, a stacked edge 280, and a base portion 260 including reinforcing ribs 270 and the injection wall 220. The capsule body 200 is disclosed in detail, for example, in WO2023 / 051967 A1 and WO2023 / 052352 A1, the contents of which are incorporated herein by reference. Figure 3 The capsule body 200 is composed of and combined Figure 1 and Figure 2 The disclosed delivery wall is similar to a delivery wall (not shown in the figure) and is closed.

[0132] Capsule 100 includes a delivery wall 300 connected to capsule body 200 to close chamber 250. This is in Figure 1 and Figure 2 As exemplarily indicated in the text.

[0133] Delivery wall 300 is arranged in a layered manner, such as Figure 1 As exemplified in the example. There is no limitation on the number of (different) layers that the delivery wall 300 may have. Figure 1 In the middle, only the main layer of the delivery wall is shown, while... Figure 2 In this context, additional layers were added between the main layers for connectivity purposes.

[0134] The delivery wall 300 is flat. The term "flat" should be understood to mean that the delivery wall 300 extends substantially in a plane. In other words, the delivery wall 300 extends in a plane, but it can deform in a convex or concave plane depending on the relative pressure between the inside and outside of the capsule. Specifically, it is possible that the ingredients contained therein (e.g., roasted and ground coffee) will generate gases, such as carbon dioxide, during the capsule's storage period. In this case, overpressure can be created inside the capsule, causing the initially flat delivery wall to bulge outwards. It is also possible that atmospheric pressure changes around the capsule, for example, if the capsule is formed, filled, and sealed in a factory near sea level, and then transported at a higher altitude where atmospheric pressure is lower. In such a case, the initially flat delivery wall will deflect inwards into a concave shape.

[0135] like Figure 1 The delivery wall presented includes:

[0136] o Filter layer 310, which is used to filter particles from the prepared beverage dispensed via the delivery wall.

[0137] o Carrier layer 320, which is adapted to open under the pressure increase of the fluid injected into the capsule.

[0138] A barrier layer 340, which provides a preferred two-way barrier against moisture and / or gases, is applied to the surface of the carrier layer 320 facing the chamber 250 of the capsule body 200.

[0139] A protective layer 350, applied to the side of the barrier layer facing chamber 250, is used to protect the barrier layer 340 from moisture at least.

[0140] A connecting layer 330 is applied as an outer layer to the side of the delivery wall 300 facing the chamber 250 to connect the delivery wall 300 to the edge portion 211 of the capsule body 200.

[0141] The delivery wall 300 is intended to be attached (by lamination / thermoforming) to a protective film 400 applied to the inner wall of the chamber 250 and to the edge portion 211 of the capsule body. Preferably, the delivery wall 300 is sealed to the protective film 400 at the location of the edge portion 211.

[0142] The filter layer 310, carrier layer 320, barrier layer 340, protective layer 350 and connecting layer 330 are all made of biodegradable, preferably compostable, materials, and are currently made of different materials.

[0143] The filter layer 310 may be configured to filter particles from the prepared beverage before dispensing the prepared beverage via the delivery wall 300. The filter layer 310 may be a thin film, membrane, or sheet having a defined thickness (and / or having a (mostly) planar surface).

[0144] As proposed, the filter layer 310 is made of a biodegradable material. Preferably, the filter layer 310 may also be made of compostable materials and / or food-safe materials (FCS, FCM).

[0145] In the proposed implementation, the filter layer 310 is made of a nonwoven material, such as cellulose fibers from wood pulp (softwood or hardwood materials) or from non-wood materials (such as sugarcane, bamboo, or hemp).

[0146] Alternatively, alternative materials may be selected, such as PLA, rayon fibers, PBS, PBS-A, PHB, PBAT, PBSeT, their corresponding copolymers, and combinations thereof.

[0147] The mechanical and filtration properties of the filter layer 310 may be affected by the thickness of the material, its density, and its permeability to particles. The filter layer 310 may have a material thickness of 10 micrometers to 300 micrometers, preferably 20 micrometers to 250 micrometers. Additionally or alternatively, the filter layer 310 may have a thickness between 10 gsm (g / m³). 2 ) and 150gsm (g / m 2 The values ​​are between 20 gsm (g / m³) and 20 gsm (g / m³). 2 ) and 100gsm (g / m 2 The weight between )

[0148] The carrier layer 320 is adapted to open during extraction in a beverage preparation machine under the pressure of an increase in the fluid injected into the capsule 100. The carrier layer 320 may be a thin film, membrane, or sheet having a defined thickness and preferably a substantially planar surface.

[0149] The carrier layer 320 is also made of a biodegradable material. Preferably, the carrier layer 320 may also be made of compostable materials and / or food-safe materials (FCS, FCM).

[0150] In the proposed solution, the carrier layer 320 (material) has a defined fibrous structure, such as a closed fibrous structure. For example, the carrier layer 320 material can be a fibrous structure having at least 50% by weight corresponding to cellulose fibers, including paper, cork, hardwood, or non-wood materials.

[0151] The carrier layer 320 may be configured to be resilient to cumulative pressure in chamber 250, preferably between 1 bar and 20 bar, more preferably between 10 bar and 20 bar, and most preferably between 12 bar and 18 bar. Specifically, the material of the carrier layer 320 may be configured to be resilient to cumulative pressure within such a pressure range in chamber 250. The thickness and density of the material can affect the stiffness, i.e., the resistance to bending, of the carrier layer 320. The carrier layer 320 may have a material thickness of 0 micrometers to 150 micrometers, preferably 30 micrometers to 70 micrometers. Alternatively or additionally, the carrier layer 320 may have a material thickness of between 20 g / m³. 2 and 150g / m 2 Between, preferably between 40 g / m 2 and 100g / m 2 The weight between.

[0152] like Figure 1 and Figure 2As shown, the delivery wall 300 also includes a barrier layer 340 that provides a barrier against moisture and / or oxygen. This barrier is chosen to be a two-way barrier against both moisture and oxygen to protect the substance 500 (preferably roasted and ground coffee) from moisture and oxygen present outside the capsule. The two-way barrier layer 340 is used to prevent liquid and / or gaseous substances / contents from entering or leaving the chamber 250. With this arrangement, the substance 500 maintains its initial quality and does not change over time.

[0153] The barrier layer 340 is positioned on the side of the carrier layer 320 facing the capsule opening 230. This barrier layer is actually positioned closest to the capsule opening 230 in order to allow all the nutritional properties and aroma of the substance 500 to be retained.

[0154] The barrier layer 340 may be provided in the form of a single layer or in multiple layers, and its total thickness may vary between 1 micrometer and 10 micrometers. The amount of barrier material in one barrier layer 340 may include between 0.1 gsm (g / m²) and 10 gsm (g / m²), so that the total amount in all barrier layers 340 is between 2 gsm and 50 gsm, preferably between 5 gsm and 40 gsm.

[0155] The barrier layer is made of a biodegradable (preferably compostable) material, such as polyglycolic acid (PGA), polyvinyl alcohol (PVOH) or copolymers, or butanediol-vinyl alcohol copolymers (BVOH) or any polymer or copolymer in which at least one monomer unit is vinyl alcohol, as well as composites or laminates of the above materials.

[0156] In this invention, the barrier layer 340 is made of BVOH (butanediol-vinyl alcohol copolymer) or a copolymer. The barrier layer is applied in several layers and has a total thickness between 3 and 4 micrometers. The total thickness of the barrier layer should not exceed 10 micrometers and 50 gsm, as this poses a risk that the delivery wall may not be punctured or may be poorly punctured during capsule extraction.

[0157] exist Figure 1 and Figure 2 In the delivery wall 300, when the delivery wall 300 is sealed to the capsule body 200, the barrier layer 340 is applied directly to the surface of the carrier layer 320 facing the capsule chamber 250.

[0158] Figure 1 and Figure 2 The oxygen permeability (OTR) of the delivery wall 300 (measured in cc / m² / day) was measured to be less than 10 cc / m² / day. 2 / day, and in some cases (depending on the material selection of different layers) less than 1cc / m 2 / sky.

[0159] To further improve OTR, the surface of the carrier layer 320 on which the barrier layer 340 is applied can be controlled / processed to have reduced surface roughness.

[0160] like Figure 1 As presented, the delivery wall 300 also includes at least one protective layer 350, which is applied to the side of the barrier layer 340 facing the chamber 250. The protective layer 350 is applied directly to the barrier layer 340 and is designed to protect the barrier layer 340 from moisture and / or oxygen to ensure optimized oxygen barrier performance of the barrier layer. During the production of the delivery wall 300, the protective layer 350 also protects the barrier layer 340 during the lamination of subsequent layers (e.g., connecting layers).

[0161] The protective layer 350 is preferably applied in several layers to enhance the protective effect of the protective layer on the barrier layer 340.

[0162] The protective layer 350 is made of a biodegradable and preferably compostable material and contributes to the complete biodegradability of the delivery wall 300.

[0163] To effectively protect the barrier layer 340, the protective layer 350 may be made of a preferably non-water-soluble material, such as a plant starch-based adhesive, a protein-based adhesive, a natural rubber-based adhesive, an aqueous dispersion of polyester and / or polyurethane elastomers, or acrylic polymers and copolymers, and / or combinations thereof. Commercially available products from various companies (such as BASF, Henkel, or SunChemicals) may be used.

[0164] Preferably, the total amount of protective layer material applied in multiple layers is 5 gsm (g / m²) and 30 gsm (g / m²), more preferably 5 gsm (g / m²) and 20 gsm (g / m²). The selected materials and amounts allow the thickness of the protective layer 350 to be limited to a maximum total thickness of 20 micrometers.

[0165] In practice, due to the potential for puncture of the delivery wall during extraction, the amount of material and thickness of the protective layer (applied in one or more layers) should not exceed 40 gsm to 50 gsm and 30 micrometers, respectively.

[0166] In addition to the layers previously discussed and as shown in the figure, the delivery wall 300 includes a connecting layer 330 to connect the delivery wall 300 to the edge portion 211 of the capsule body 200 to close the chamber 250, thereby forming a closed capsule 100.

[0167] Therefore, the connecting layer 330 is applied as an outer layer to the side of the delivery wall 300 facing the chamber 250 to connect the delivery wall 300 to the edge portion 211.

[0168] As understood and as Figure 1 As can be seen, the connecting layer 330 is attached to the edge portion 211 of the capsule body, which includes the protective film 400. The protective film 400 and the connecting layer 330 are then bonded together to ensure a tight seal of the capsule 100.

[0169] The material of the connecting layer 330 is selected to be biodegradable and preferably compostable, and is selected to be non-water-soluble to avoid any interaction with / degradation by the moisture content of the beverage substance 500 (e.g., roasted and ground coffee) contained in chamber 250.

[0170] It is proposed that the material of the connecting layer 330 is selected to include nonwoven aliphatic or aliphatic aromatic polyester or a combination thereof.

[0171] Nonwoven materials may be selected from a list including the following materials: polylactic acid (PLA), polyhydroxyalkanoate (PHA), polybutylene succinate (PBS), polybutylene succinate-co-adipate (PBSA), polybutylene adipate-co-terephthalate (PBAT), polybutylene sebacate-co-terephthalate (PBSeT), and their respective copolymers and combinations thereof.

[0172] Due to the nonwoven structure of the connecting layer 300, the weight of the material of the connecting layer can be between 25 g / m² and 150 g / m², preferably between 35 g / m² and 100 g / m², while having a limited impact on the opening of the delivery wall and extraction during capsule extraction.

[0173] The connecting layer 330 can be obtained through spunbond, meltblown, or short fiber processes. However, additional manufacturing processes that result in a nonwoven structure can be considered.

[0174] During the production of delivery wall 300, the bonding layer is applied to delivery wall 300 by lamination.

[0175] The connecting layer 330 is sealed (preferably by heat sealing or ultrasonic sealing) or attached to the protective film 400 at the edge portion 211 of the capsule body 200 by adhesive bonding to form the final capsule 100.

[0176] The following diagram illustrates the sealing strength of delivery walls that have the same basic structure but use different materials for their connecting layers. The basic structure is the previously disclosed structure having a filter layer 310, a carrier layer 320, a barrier layer 340, and a protective layer 350.

[0177] Sealing strength can be defined as the force required to separate / delaminate the delivery wall from the surface it is attached to (the edge portion of the capsule body). Sealing strength is given in Newtons per 15 mm and is related to the adhesive width.

[0178]

[0179] Table 1.

[0180] As can be seen from Table 1, the sealing strength provided by the heat-sealable coating is lower than that obtained by the nonwoven structure.

[0181] Based on the tests conducted, the seal strength obtained with a heat-sealable coating may not be sufficient to withstand Nespresso in some cases. ® The coffee machine has high extraction pressure or can withstand air transport conditions.

[0182] Additional basis weight of heat-sealable coated joints cannot be tested because higher basis weight, even if it provides higher sealing strength, may not provide efficient puncture or may render the delivery wall completely impenetrable.

[0183] Based on the above test results, under the proposed structure and materials of the connecting layer 330, when measured according to ASTM F88 / F88M-21, which is related to the standard test method for the sealing strength of flexible barrier materials, the sealing strength of the delivery wall on the edge portion 211 of the capsule body 200 (including the protective film 400) is at least 6 N / 15 mm.

[0184] As proposed, the delivery wall 300 includes a connecting layer 330 made of a biodegradable / compostable nonwoven material, preferably produced by a spunbond process, which provides high sealing strength (above 6 N / 15 mm) when considering existing technology solutions. Due to the nonwoven structure, the (larger) thickness of the connecting layer 330 will not prevent the opening element (pyramidal plate) of the beverage extraction machine from piercing the delivery wall of the capsule and allowing coffee to flow through it.

[0185] Due to the proposed nonwoven structure and high material basis weight of the connecting layer 330, a high-strength (thermally) sealable delivery wall can be provided, while still allowing for optimized puncture of the delivery wall and coffee extraction.

[0186] In addition to the filter layer 310, carrier layer 320, barrier layer 340, protective layer 350, and connecting layer 330, the delivery wall 300 may also include additional layers. These additional layers may be inserted between different layers as needed and according to their function.

[0187] For example, such as Figure 2 As proposed, the adhesive layer 360 is inserted between the carrier layer 320 and the filter layer 310 to bond them together by adhesive bonding or heat sealing.

[0188] Therefore, the carrier layer 320 and the filter layer 310 are at least partially joined to each other on their opposing sides, i.e., joined to each other on their facing sides due to the adhesive layer 360. The adhesive layer 360 may be made of one or more adhesive layers, and an adhesive bond is provided between the carrier layer 320 and the filter layer 310 to ensure efficient adhesion of the two layers.

[0189] The adhesive layer is also biodegradable, and preferably compostable, such as plant-based starch or acrylic adhesive, and contributes to the biodegradable properties of the entire capsule.

[0190] The bonding strength of the adhesive layer 360 can vary depending on the materials of the filter layer 310, the carrier layer 320, and the adhesive layer 360.

[0191] like Figure 2 As can also be seen, the delivery wall 300 also includes at least one adhesive layer 370 for adhering the connecting layer 330 to the protective layer 350. In addition to providing the required adhesion between the connecting layer 330 and the protective layer 350, the adhesive layer 370 also has a protective effect (on the protective layer and the barrier layer) during the lamination of the connecting layer 330 onto the delivery wall structure.

[0192] The adhesive layer 370 can use materials commonly used for bonding or sealing purposes. For example, commercially available sealants, adhesive polyesters, or polyurethane-based elastomers can be used. The amount of material used for the adhesive layer 370 is typically between 0.5 gsm and 20 gsm to ensure efficient bonding while maintaining the open nature of the delivery wall 300.

[0193] In the case of the present invention, the nonwoven structure of the connecting layer 330 is laminated onto the adhesive layer 370, which provides high adhesion between the two layers and also protects the barrier layer 340 from moisture, thereby helping to maintain the barrier properties of the barrier layer 340.

[0194] The additional layer presented above neither affects nor degrades the previously presented results regarding the OTR performance of delivery wall 300.

[0195] Therefore, according to Figure 1 or Figure 2 The implementation scheme has improved OTR performance (OTR less than 10cc / m 2 / day, preferably less than 1cc / m 2 The delivery wall 300 (per day) can be used with ( Figure 1 or Figure 3 The capsule body 200 described above is used in combination to provide a capsule 100 with an extended shelf life and optimized extraction.

[0196] use Figure 1 and Figure 2 In the proposed delivery wall implementation scheme, a filter layer 310 and a carrier layer 320 are disposed on the capsule body 200, such that the filter layer 310 is positioned opposite the carrier layer 320 to the chamber 250.

[0197] In the example, carrier layer 320 faces chamber 250. Alternatively or additionally, carrier layer 320 may be disposed in the delivery wall closer to chamber 250 than filter layer 310. This is in Figure 1 and Figure 2 The example is illustrated below.

[0198] Preferably, each of the filter layer 310, the carrier layer 320, and the barrier layer 340 may be made of different biodegradable and preferably compostable materials. These three layers may be distinguished by at least one of their respective physical properties, such as tensile strength, ductility, elasticity, puncture resistance, density, porosity, and / or (if applicable) fiber structure and / or fiber orientation. For example, it may be preferred that the filter layer 310 be more elastic than the carrier layer 320, because typically, for a layered structure, layers further from the base layer experience greater strain during bending compared to layers closer to the base layer.

[0199] As shown, the delivery wall 300 may be positioned relative to the chamber 250 opposite the injection wall 220. The delivery wall 300 and the injection wall 220 may be positioned relative to each other such that, in operation, the injected fluid traverses the capsule 100 in the order of the injection wall 220, the chamber 250 (and, if available, the substance 500 contained therein), and the delivery wall 300. The chamber 250 may be completely enclosed by the delivery wall 300 (at one end), the injection wall 220 (at its opposite end), and the side wall 210 (along / around the side between the two opposite ends). The delivery wall 300 extends completely above the opening 230 and overlaps with the edge portion 211.

[0200] Another aspect of the present invention relates to a method for manufacturing the above-described capsule 100.

[0201] The capsule body 200 is formed of a biodegradable pulp material, such as cellulose pulp, bamboo pulp, bagasse pulp, or wood pulp. An injection wall 220 (preferably together with the capsule body 200) is formed such that it constitutes at least a portion of a chamber 250 for receiving a substance 500 for preparing a beverage. As described above, a delivery wall 300 is provided and attached to the capsule body 200, for example, by a heat seal. The delivery wall 300 is disposed on the capsule body 200 such that the filter layer 310 is positioned opposite the carrier layer 320 to the chamber 250.

[0202] Preferably, the capsule body 200 can be formed by wet pulp molding. A pulp of biodegradable pulp material (such as wood pulp, bagasse pulp, non-wood pulp, and / or any form of cellulose-based pulp) can be pressed into a mold to form the capsule body 200. The capsule body 200 thus formed is then dried. At least a portion of the inner surface (before filling) or at least a portion of the outer surface of the capsule body 200 may be provided with a protective film 400, for example, by thermoforming.

[0203] Alternatively, the capsule body 200 can be formed by dry slurry molding. Thus, a preform of preferably dried cellulose fibers can be provided, and the capsule body 200 is preferably formed from this preform using tools under the influence of heat and / or water. A protective film 400 can be applied as a lining to the interior of the capsule body 200 (e.g., by applying heat and / or vacuum), extending between the two ends of the capsule body 200 on the inward-facing surface of the sidewall 210 and covering that inward-facing surface, and extending on its surface opposite to the chamber 250 and covering the edge portion 211.

[0204] In either of the two aforementioned methods, the injection wall 220 may be formed together with the capsule body 200, for example, in the same step. Preferably, the injection wall 220 may be formed by (wet / dry) slurry molding or by attaching a membrane or film, serving as the injection wall 220, to the capsule body 200 after its formation, for example, with a biodegradable adhesive. For example, by (wet / dry) slurry molding, the injection wall 220 may be formed together with the capsule body 200 in the same process step, while a second separate process step may be required to attach the injection wall 220 with an adhesive. The capsule body 200 may be filled with a substance 500 for preparing a beverage. Due to the connecting layer 330, a delivery wall 300 may be provided and attached to the capsule body 200, such that the carrier layer 320 is oriented towards the chamber 250. A protective film 400 may be added to the (circumferential) surface of the capsule 100, which is preferably made of a biodegradable and / or compostable material. At least a portion of the inward-facing or outward-facing surface of the injection wall 220 (which may also define the surface of the chamber 250) may be provided with a protective film 400.

[0205] As disclosed, the disclosed delivery wall 300 is therefore composed of different layers of material, each layer having specific properties and functions, and contributing as a whole to the final properties of the delivery wall 300.

[0206] The delivery wall 300 may then include a layered structure or is proposed to be a laminated structure. Typical laminate manufacturing processes are known in the prior art.

[0207] The specific arrangement of one or more connecting layers 330 on the protective layer 350 or on the barrier layer 340 can be accomplished using coating or printing techniques. If a coating is applied, the coating is, for example, water-based.

[0208] Another aspect of the invention relates to a system comprising the aforementioned capsule 100 and a beverage production machine, and to the use of the aforementioned capsule 100 for preparing a beverage in a beverage production machine having a capsule holder.

[0209] For example, the capsule 100 as described above can be positioned and inserted into the brewing chamber of a beverage production machine. The brewing chamber includes a first component for receiving the capsule and a second component including a capsule retainer with an opening structure. During the extraction process, the capsule 100 is placed in the beverage production machine such that the filter layer 310 is closer to (and eventually contacts) the opening structure of the capsule retainer of the second component of the machine's brewing chamber (including an opening element in the form of a surface with raised and recessed features) than the carrier layer 320. The brewing chamber is then closed.

[0210] The injection wall 220 of capsule 100 may be perforated by an injection nozzle of a beverage production machine to inject fluid into chamber 250 to interact with substance 500. Fluid (such as a liquid or liquid / gas mixture) may be injected into chamber 250, causing pressure to build up in capsule 100, and delivery wall 300 will press against, for example, an opening element of the beverage production machine. At least a portion of delivery wall 300 may be opened when the pressure of the injected fluid in chamber 250 reaches a predetermined level. Preferably, carrier layer 320 may be perforated. Alternatively or additionally, delivery wall 300 may be configured such that (e.g., regarding its material configuration / selection) carrier layer 320 may be perforated while filter layer 310 itself is not perforated (because it has an open fibrous structure). In this preferred embodiment, carrier layer 320 is perforated while filter layer 310 remains integral. The prepared beverage can be discharged from the capsule 100, wherein the beverage can pass through an opening in the carrier layer 320 and a cavity in the filter layer 310 (a porous material), wherein the carrier layer 320 can be closer to the chamber 250 than the filter layer 310, and the filter layer 310 is positioned opposite the chamber 250 relative to the carrier layer 320.

[0211] Compared to capsules that include aluminum delivery walls, the delivery walls 300 of capsules used in closed brewing chambers therefore open with a surface having raised and recessed features to reduce tearing.

[0212] As previously mentioned, the present invention also relates to the use of the capsules and systems described above.

[0213] It should be understood that various changes and modifications to the currently preferred embodiments of the capsule described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the scope of the invention as covered by the appended claims.

[0214] In the claims, any reference marks placed between parentheses should not be construed as limiting the claims. The word “comprising” does not exclude the presence of other elements or steps besides those listed in the claims. Furthermore, as used herein, the terms “a” or “an” are defined as one or more. Additionally, the use of introductory phrases such as “at least one” and “one or more” in the claims should not be construed as implying that any particular claim containing such introduced claim elements is limited to the invention comprising only one such element, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an.” The same applies to the use of definite articles. Unless otherwise specified, terms such as “first” and “second” are used to arbitrarily distinguish the elements described by such terms. Therefore, these terms are not necessarily intended to indicate the time or other priority of such elements. The mere fact that certain measures are stated in mutually different claims does not imply that a combination of these measures cannot be used advantageously.

[0215] Unless otherwise expressly specified as incompatible, or if the physics or other aspects of the embodiments, examples, or claims prevent such combinations, the features of the foregoing embodiments and examples, as well as those of the following claims, can be integrated in any suitable arrangement, especially where doing so has beneficial effects. This is not limited to any particular beneficial effect, but may arise from “post-hoc” beneficial effects. That is, the combination of features is not limited to the forms described, especially not to the forms (e.g., numbering) of one or more examples, one or more embodiments, or one or more dependent claims. Furthermore, this also applies to the phrases “in one embodiment,” “according to one embodiment,” etc., which are merely stylistic forms of wording and should not be construed as limiting the following features to a single embodiment, but rather to all other instances of the same or similar wording. That is, references to “a,” “an,” or “some” embodiments may refer to any one or more and / or all of the disclosed embodiments or combinations thereof. Similarly, references to “the” embodiment may not be limited to the preceding embodiment.

[0216] The foregoing description of one or more specific embodiments is provided for illustration and description, but is not intended to be exhaustive or to limit the scope of the invention to the precise forms disclosed. Modifications and variations are possible in light of the foregoing teachings, or may be obtained from practice of various specific embodiments of this disclosure.

Claims

1. A capsule (100) for preparing a beverage in a beverage production machine, wherein the capsule (100) comprises: - Capsule body (200), the capsule body including sidewalls (210) and edge portions (211), the sidewalls defining chambers (250) for containing substances (500) for preparing the beverage, and the edge portions defining openings (230) in the sidewalls (210). - Injection wall (220), the injection wall closing the chamber at a first end, the injection wall being used to inject fluid into the chamber (250) to prepare the beverage when the fluid interacts with the substance (500); and - A delivery wall (300), connected to the capsule body (200), preferably connected to the edge portion (211), to close the chamber (250) at a second end of the capsule body (200), the delivery wall (300) comprising in a layered manner and in the following order: A filter layer (310) made of a biodegradable material, facing away from the chamber (250), is used to filter particles from the prepared beverage dispensed via the delivery wall (300). a carrier layer (320) made of a biodegradable material, said carrier layer (320) being adapted to open under pressure increase of the fluid injected into said capsule (100), and A barrier layer (340) made of a biodegradable material, the barrier layer being used to provide a preferred two-way barrier against moisture and / or gases, the barrier layer (340) preferably being made of a material different from that of the filter layer (310) and / or the carrier layer (320); the barrier layer (340) being applied to the surface of the carrier layer (320) facing the chamber (250). The delivery wall (300) further includes: At least one protective layer (350) is applied to the side of the barrier layer facing the chamber (250) to protect the barrier layer from moisture at least. A connecting layer (330), which is applied as an outer layer to the side of the delivery wall (300) facing the chamber (250) for connecting the delivery wall (300) to the edge portion (211), the connecting layer being made of a biodegradable material and comprising at least a nonwoven aliphatic or aliphatic aromatic polyester selected from the list of materials including: polylactic acid (PLA), polyhydroxyalkanoate (PHA), polybutylene succinate (PBS), polybutylene succinate-co-adipate (PBSA), polybutylene adipate-co-terephthalate (PBAT), polybutylene sebacate-co-terephthalate (PBSeT), and their respective copolymers and combinations thereof.

2. The capsule (100) according to claim 1, wherein the connecting layer (330) has a density of between 25 g / m³. 2 and 180g / m 2 Between, preferably between 35g / m 2 and 120g / m 2 The weight between.

3. The capsule (100) according to claim 1 or 2, wherein the connecting layer (330) is preferably sealed to the edge portion (211) of the capsule body (200) by heat sealing or ultrasonic sealing.

4. The capsule (100) according to any one of the preceding claims, wherein the capsule body (200) and preferably the injection wall (220) further include a barrier, layered and / or laminated protective film (400) extending to the edge portion (211) of the capsule body (200), wherein the connecting layer (330) of the delivery wall (300) is sealed to the protective film.

5. The capsule (100) according to any one of the preceding claims, wherein the sealing strength of the delivery wall on the edge portion (211) of the capsule body (200) including the protective membrane (400) is at least 6 N / 15 mm, the sealing strength being measured according to ASTM F88 / F88M-21, a standard test method for the sealing strength of flexible barrier materials.

6. The capsule (100) according to any one of claims 3 to 5, wherein the seal between the connecting layer (330) and the edge portion (211) is limited to the periphery of the connecting layer (330), thereby defining two regions with different technical characteristics in the connecting layer (330).

7. The capsule (100) according to any one of the preceding claims, wherein the connecting layer (330) is obtained by spunbonding, meltblowing or short fiber process, and is applied to the delivery wall by lamination during the production of the delivery wall (300).

8. The capsule (100) according to any one of the preceding claims, wherein the filter layer (310) is made of a compostable nonwoven material, preferably of cellulose fibers, such as wood fibers or non-wood fibers or sugarcane pulp, or of rayon fibers, or of aliphatic or aliphatic aromatic polyesters selected from the list of materials including: polylactic acid (PLA), polyhydroxyalkanoate (PHA), polybutylene succinate (PBS), polybutylene succinate-co-adipate (PBSA), polybutylene adipate-co-terephthalate (PBAT), polybutylene sebacic acid-co-terephthalate (PBSeT), and their respective copolymers and combinations thereof; and / or The filter layer (310) has a density of between 10 g / m³. 2 and 150g / m 2 Between, preferably between 20 g / m 2 and 100g / m 2 The weight between.

9. The capsule (100) according to any one of the preceding claims, wherein the carrier layer (320) is made of a compostable material having a defined closed fibrous structure, wherein at least 50% by weight corresponds to cellulose fibers, said cellulose fibers including paper, cork, hardwood or non-wood materials and combinations thereof, and / or; The carrier layer (320) has a density of between 20 g / m³. 2 and 150g / m 2 Between, preferably between 30g / m 2 and 100g / m 2 The weight between.

10. The capsule (100) according to any one of the preceding claims, wherein the barrier layer (340) provides a preferred two-way barrier against moisture and / or oxygen, wherein the barrier layer (340) is made of a biodegradable and preferably compostable material comprising polyglycolic acid (PGA), polyvinyl alcohol (PVOH), butanediol-vinyl alcohol copolymer (BVOH) or any ethylene alcohol copolymer in which at least one monomer unit is ethylene alcohol, and a composite or laminate of the above materials, and wherein the barrier layer (340) is preferably made of a material different from that of the filter layer (310) and / or the carrier layer (320).

11. The capsule (100) according to any one of the preceding claims, wherein the barrier layer (340) is applied in one or more layers to the surface of the carrier layer facing the chamber (250) in a total amount of 2 gsm (g / m²) to 50 gsm (g / m²), preferably 5 gsm (g / m²) to 40 gsm (g / m²).

12. The capsule (100) according to claim 11, wherein the oxygen permeability (OTR) of the delivery wall (300) is less than 35 cc / m² / day, preferably less than 10 cc / m² / day, most preferably less than 1 cc / m² / day, said oxygen permeability being measured according to the ASTM D3985 / ISO 15105 method.

13. The capsule (100) according to any one of the preceding claims, wherein the protective layer (350) is applied directly onto the barrier layer (340) and is applied in one or more protective layers in a total amount between 5 gsm (g / m²) and 30 gsm (g / m²), preferably between 5 gsm (g / m²) and 20 gsm (g / m²), and has a maximum total thickness of 20 micrometers.

14. The capsule (100) according to claim 13, wherein the protective layer (350) is made of a biodegradable and preferably compostable material, and preferably non-water-soluble, such as a plant starch-based binder, a protein-based binder, a natural rubber-based binder, an aqueous dispersion of polyester and / or polyurethane elastomers, or an acrylic polymer and copolymer, and / or a combination thereof.

15. The capsule (100) according to any one of the preceding claims, wherein the injection wall (210) is integrally formed with the capsule body (200), and the capsule body (200) is made of cellulose-based pulp molding material, preferably wood-based pulp molding material.

16. A system for preparing a beverage, the system comprising a beverage production machine and a capsule (100) according to any one of claims 1 to 15, the beverage production machine having a fluid dispensing device and a brewing chamber, the fluid dispensing device being capable of supplying a quantity of fluid, such as water, to the capsule (100) at a pressure between 2 bar and 20 bar, the brewing chamber comprising a first component defined as a capsule retainer for receiving the capsule and a second component for closing the brewing chamber. The second component of the brewing chamber includes an opening structure for engaging with the delivery wall (300) of the capsule (100) when the brewing chamber containing the capsule is closed. The opening structure includes a raised and recessed surface on the delivery wall (300) facing the capsule in use, preferably facing the filter layer (310). When used in a closed brewing chamber, the delivery wall (300) of the capsule opens with reduced tearing through the raised and recessed surfaces of the opening structure, compared to capsules that include aluminum delivery walls.

17. Use of the capsule (100) according to any one of claims 1 to 15 in the beverage preparation system according to claim 16 for preparing a beverage in a beverage production machine having a capsule holder.

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