Capsule for preparing predetermined amount of beverage suitable for drinking using extractable product

Abstract

A capsule (1) for preparing a predetermined amount of beverage suitable for drinking using an extractable product (2), such as ground coffee, comprises a first capsule half (3) and a second capsule half (4). Each half bladder (3, 4) comprises a thin bladder wall (5, 6). The thin bladder wall (5, 6) is formed with a first thin wall portion (7, 8) in one piece, thereby defining a substantially hemispherical inner half-chamber (9, 10). The bladder wall (5, 6) forms, close to its larger dimension (D), a second thin-walled portion (11, 12) integral with the first thin-walled portion (7, 8), said second thin-walled portion being bent to form an annular flange (13, 14). The two half-bladders (3, 4) are arranged facing each other and mirror-like to each other and connected to each other. At least one of the annular flanges (13 or 14) of the half-bladders (3 or 4) comprises a free flange end edge (26 or 27) which forms a flange annulus (28 or 29).

Description

Technical Field

[0001] The present invention belongs to the general technical field of disposable capsules for preparing drinks, preferably but not limited to coffee, the product to be infused of which is arranged in a packaging serving as an infusion chamber and is kept in this packaging for use, or, if the product to be infused is a soluble extract, is dissolved.

[0002] More specifically, the present invention relates to the technical field of capsules intended to be pierced to allow the injection of a fluid, such as pressurized water, into said capsules. The invention also relates to the technical field of methods allowing such capsules to be soaked. Background Art

[0003] Single-use pods and capsules are known in the prior art and are described, for example, in WO 2004 / 006740 (SEB), WO 94 / 01344 (Nestlé), US 2004 / 0197444 (Kraft Foods), US No. 5,012,629 (Kraft Foods), WO 2004 / 087529 (Hausbrandt), EP 1,221,418 (Melitta Haushaltsprodukte), EP 1,295,554 (SGL Italia) and EP 0,583,210 (Fornari).

[0004] FR 2,879,175 (Luciani) describes a capsule that includes a bag-like element that serves as an infusion chamber. However, the capsule is used solely to deliver a predetermined amount of infusion material to a dedicated infusion chamber within the machine. If the capsule includes a packaging shell, this shell serves only to protect the infusion material and must be removed before the capsule can be removed.

[0005] A sealed capsule adapted to be opened by the pressure of the injected water is particularly advantageous, since such a capsule allows obtaining a high-quality beverage.

[0006] In particular, from EP 0,554,469 (Nestlé) a capsule is known which is intended for use in machines for the automatic preparation of drinks and is formed by a compacted aggregate of the substance to be infused contained in a packaging shell which is impermeable to gas and water and has the shape of a truncated cone.

[0007] Apart from hygienic reasons, the use of an air- and water-impermeable packaging casing offers the advantage that the capsule can be stored for a relatively long period of time without the taste and aroma of the beverage being deteriorated.

[0008] Furthermore, the beverage can be infused directly in the capsule, the packaging housing serving as an infusion chamber.

[0009] Another feature of the bladder is that the packaging shell is configured to rupture when pressurized water is injected into the bladder. The packaging shell ruptures only in a weak area provided at the base of the truncated cone.

[0010] Such a capsule, due to its shape and design, has to be placed in a specific position in the infusion chamber of the extraction machine.

[0011] In practice, the soaking is carried out by a piercing device configured to pierce the upper portion of the truncated cone and inject pressurized water. Under the action of the pressure, a weak area arranged at the base of the truncated cone breaks, and water is injected through the capsule toward a pipe for recovering the soaked substance, and the soaked substance is transported toward a container, such as a cup.

[0012] A disadvantage of this type of capsule is that it must be positioned so that the top of the truncated cone is opposite the piercing device and the weak area at the base of the truncated cone is opposite the duct for recovering the soaked substance, and different arrangements risk damaging the machine.

[0013] Therefore, it is necessary to provide a device for forcibly positioning the capsule in the infusion chamber. This design of the machine becomes complicated and does not allow the machine to be provided with a tank in which the capsules are stored in batches and automatically conveyed to the infusion chamber.

[0014] WO 2021205269A1 discloses a food packaging capsule made of a decomposable material. The capsule comprises coffee-based granular material and at least one binder selected from methylcellulose, methylcellulose derivatives, and mixtures thereof. The capsule has a lenticular and symmetrical shape about the plane connecting the two body portions.

[0015] WO 2011000724A1 discloses a capsule or lenticular capsule having two walls connected to each other at a joint along a transverse midplane. This joint is achieved by sealing the peripheral edge of each wall. Similar solutions are known from FR 2912124A1, WO 0228241A1, FR 2930522, EP 2750563B1, and US Pat. No. 6485766.

[0016] WO02058522A2 discloses a cartridge comprising: a cartridge inlet; a chamber connected to the cartridge inlet to accommodate a suitable material containing fragrance or particles; a cartridge outlet connected to the chamber; and a handle allowing a user to connect and fix the cartridge inlet to a support member to allow pressurized liquid to pass through the material containing fragrance or particles and be distributed into the chamber and directly distributed into a container, such as a cup or kettle, through the cartridge outlet for drinking. The handle comprises at least a portion of a chamber wall that is rigid. The cross-sectional area of ​​the cartridge inlet is much smaller than the cross-sectional area of ​​the chamber to reduce the force exerted by the liquid pressure at the cartridge inlet. The cartridge outlet has a narrowed opening as a port to form a high-speed jet or stream of fluid and can interact with air to produce foam in the dispensed fluid.

[0017] EP2106375A2 discloses a capsule that can be used at any position in a machine for automatically preparing and dispensing drinks, wherein the machine is provided with a device for piercing the shell of the capsule and injecting pressurized water into the capsule. A feature of the capsule is that the capsule does not require any pre-positioning in the infusion chamber of the machine. The capsule is to be used in a machine for automatically preparing and dispensing drinks and is formed by a compacted aggregate of a substance to be infused, which is trapped in an airtight and watertight regulating shell so that it can be infused inside the capsule. The regulating shell has a generally spherical outer shape and is suitable for being pierced on almost any part of its surface when water is injected into the capsule. Although the overlap of the edges of the two half shells is shown, in this document, Figure 1 There is no disclosure of any flanges protruding radially from the spherical element. Quite differently, the document emphasizes the absolute necessity of providing a spherical capsule that "can be pierced substantially on any part of its surface, regardless of its position relative to the piercing and injection means and the device for recovering the injected substance" (reference). The objective of EP 2 106 375 A2 would be completely unattainable if the capsule had flanges for orienting its position. Similar solutions are known from FR 2 879 175 A1, DE 2 981 1 729 U1, FR 1 305 737 A, EP 2 575 490 B1, EP 2 598 417 B1, US 1 931 765, EP 3 501 345 B1, and FR 3 047 159.

[0018] Although these known solutions are satisfactory from certain perspectives, they still leave many unmet needs. In particular, there is a need for a capsule for delivering a single dose that has an optimized ratio between the outer surface (packaging shell) and the volume of the contents (ingredients forming the drink), while allowing good handling and management before and after use.

[0019] WO2022003526A1 discloses a conical bladder and a method for producing the same. The bladder is provided with a packaging shell configured to rupture during the injection of pressurized water into the bladder. The packaging wall is pierced only at a weakened area located at the base of the truncated cone. Due to the shape and design of the bladder, its conical shape necessitates positioning it in a specific position within the injection chamber. Injection is performed using a piercing device configured to pierce the top of the truncated cone and inject pressurized water. The flange in this solution forms a hydraulic seal, preferably formed in a curled fold at the end of the flange. Summary of the Invention

[0020] The object of the present invention is therefore to overcome the drawbacks of the prior art and to allow for a capsule that minimizes the use of packaging material while having a maximum material volume for forming a drink and in particular allows for improved fluid penetration into the ingredients used to form the drink.

[0021] Furthermore, the present invention is based on the use of a capsule having at least one flange, at least a portion of which has a greater thickness, so that the capsule is arranged and / or oriented in a predetermined manner, for example in a predetermined manner inside an extraction chamber of a beverage extraction device or machine.

[0022] This object and others are achieved by a capsule according to claim 1 .

[0023] Advantageous embodiments are the subject matter of the dependent claims.

[0024] In short, an embodiment can be summarized as providing a capsule for preparing a predetermined amount of a beverage suitable for drinking using an ingredient, a ready-to-extract product (e.g., ground coffee), the capsule comprising a first capsule half and a second capsule half, wherein each capsule half comprises a thin capsule wall. The thin capsule wall is formed with a first thin-walled portion in one piece, the first thin-walled portion defining a generally hemispherical inner half-chamber. The two capsule halves are arranged facing each other and mirror-imaged to each other so that at least a second portion of the two capsule halves are in contact when the two capsule halves are connected to each other. The first thin-walled portion has a profile portion with a generally identical volume portion. The mirror-imaged first thin-walled portions essentially form a profile portion with an overall generally spherical volume portion having a truncated pole.

[0025] By means of the general embodiments and variants described above and further below, the following advantages can be achieved.

[0026] The proposed solution, primarily by means of a spherical capsule with truncated poles, for example, of the north-south type (the truncated poles being substantially planar or slightly concave), allows for a spherical shape for single-dose beverages, such as coffee, with an optimal ratio between the outer surface (the packaging shell) and the contents (the ingredients used to form the beverage), while also improving fluid penetration into the ingredients used to form the beverage. In particular, the use of a spherically compressed content optimizes this ratio, minimizing the amount of material used to package the single-dose. This reduces the environmental impact and ensures high quality standards for the beverage. The compressed contents in this spherical shape with truncated poles also reduce the amount of air / gas bound to the solid contents, thereby improving the preservation of the single-dose and reducing waste. Furthermore, the solid contents contribute to the mechanical resistance of the single-dose during packaging, transport, and use. This mechanical resistance, combined with the shell's barrier to oxygen and moisture, allows for the use of secondary, lightweight packaging, such as paper or cardboard, further reducing environmental impact and the use of raw materials and energy.

[0027] Spherical capsules with truncated poles and compressed contents (ingredients) attached to the inner wall are the best solution to ensure the integrity of the panel. The term "panel" is understood to mean an ingredient or compressed extractable product formed from granules, powders or similar mixtures, which ideally remains in this form until use. The use of spherical capsules with truncated poles prevents panel breakage, which can affect extraction efficiency (preferential flow paths of the extraction fluid) and ensures the quality of the permeation. In contrast, packages with contents arranged in a trumpet shape, such as a cone or a cylinder, may remain movable or have a negative impact on the hydraulic resistance, which is crucial for pressurization during the permeation process.

[0028] The resistance of a solid porous mass to hot or cold water (which contributes to the pressure of the hot or cold water for good penetration) depends on a number of factors, including: the amount and compression of the ingredients or mixture, the length and tortuosity of the path of the water through the mass, the uniformity and distribution of the particles, the initial penetration of the water, the duration of "wetting" (the diffusion of water on the ingredients, thereby facilitating the expansion of the mass in the encapsulation cavity), the time of contact between the water flow and the particles to absorb aromas and soluble substances, the consistency and distribution of the water flow on the mass, the adhesion of the ingredients to the inner wall of the mass, the temperature of the water, and the presence of carbon dioxide for foam formation.

[0029] All of these variables affect the pressurization of the mass and, therefore, the quality of the resulting beverage.

[0030] The cylindrical shape is the most common geometry used for porous masses used for extracting or dissolving beverages. This is because, as long as the mass has uniform porosity, uniform water distribution, and a constant flow under static pressurized conditions, the cylindrical shape allows water to pass through the porous mass in a constant and controlled manner, regardless of position relative to the central axis of the flow.

[0031] In the most common systems for preparing beverages by pressurized extraction with hot or cold water, which typically use positive displacement piston pumps, it is difficult to achieve a constant flow, static pressure, and uniform water distribution across the porous mass. This results in a more concentrated flow in the central area at the expense of the peripheral areas of the mass, which are then not optimally extracted. Furthermore, this inhomogeneity in penetration increases the risk of preferential pathways and mass loss in the central area, especially if the porous mass has been damaged by transport or handling prior to use.

[0032] The centrally located spherical shape with a truncated pole provides a longer and more tortuous path through the mass, which gradually shortens as it moves away from the central axis of the flow. This means that water penetrating the peripheral area experiences less hydraulic resistance, thereby balancing the Gaussian distribution of water and also allowing for more efficient extraction of the ingredients in the peripheral area. By means of the spherical shape with truncated poles:

[0033] The water or extract is evenly distributed and further penetrates the entire hemisphere;

[0034] The porous mass adheres correctly to the outer wall during expansion;

[0035] The extract may readily flow towards an outlet region that is centered or eccentric relative to the central axis.

[0036] In short, a spherical shape with truncated poles that accommodates a porous batch with uniform permeability can ensure efficient penetration during infiltration because it reduces the central flow and facilitates a more uniform distribution, thereby further wetting the peripheral area.

[0037] By virtue of the spherical shape and the truncated poles, the flow initially moves apart (meeting the ingredient to be infiltrated), but then the flow moves closer again at the end where the ingredient is denser and more compressed (and more blocked).

[0038] What this means is that when the flow meets the batch, the flow initially slows down, but in the exit area the flow speeds up again, where the batch is denser and more compressed.

[0039] This effect on the flow is determined by the transverse diameter of the path, which is equivalent to the volume of the conduit available for the flow. This can be understood by considering the cross-section of the flow through the porous body.

[0040] The effect of slowing down and accelerating a flow is used in many systems, such as hydraulic systems, ejectors, sprinklers, and venturi valves. In coffee percolation, this effect can also be used to improve the quality of the percolation.

[0041] The gradually widening cross-section facilitates water distribution across the inlet surface, eliminating the need for diffusion gaps. On the other hand, the gradually narrowing cross-section, driven by hydraulic pressure at the top, further compacts the particles in the lower region. The surrounding extraction chamber supports this compaction, providing the necessary counterforce.

[0042] When viewed laterally, the lower layer of the porous mass also offers less hydraulic resistance than the overlying layer due to its reduced resistance thickness. This means that as water gradually flows through the porous mass, it encounters less and less resistance, resulting in a decrease in pressure. To effectively extract the lower layer of the mass, the wedge effect counteracts this reduction in resistance, compacting the particles as they migrate toward the outlet, making the flow path more tortuous and counteracting the acceleration of the flow due to the narrowing of the cross-sectional area.

[0043] The automatic wedge-effect compaction of the lower hemisphere provides greater resistance to the lower layers, thus maximizing the use of the ingredients at these levels. Furthermore, there is a potential "self-healing" effect that can lead to preferred paths due to block breakage or particle migration. In practice, automatic compaction occurs during the penetration period, which is subject to pressure.

[0044] It is known to those skilled in the art that the movement of fine powders or particles during packaging, transport and handling can have a negative impact on the permeate quality of the beverage. These smaller and lighter particles tend to move more easily, resulting in uneven distribution of the particle mixture. This can lead to problems such as the fine particles clogging filters or narrow channels, which can lead to increased hydraulic pressure and decreased permeate flow. However, the presence of fine particles is also very important for achieving good permeate quality and the correct formation of foam. Therefore, it is necessary to find the right balance between the presence of fine particles and their ability to cause problems, ensuring that the fine particles are supported and locked in the network formed by particles / particulates that are larger than the particles compressed in the packaging, and that the fine particles are supported in the extraction chamber without collapsing. If the fine particles move too much, the extraction pressure may increase too much, resulting in a decreased flow. This can lead to over-extraction. The spherical shape of the compressed ingredient helps to trap these fine particles in high areas of the porous mass.

[0045] Shapes with two hemispheres with truncated poles are well-suited for easy deep drawing, especially when made with very thin laminates (such as metal laminates), for example aluminum layers, thus providing comprehensive protection against oxygen and moisture. Their geometry, with a depth / diameter ratio of less than 0.5 and their progressive shape, also make them well-suited for forming with other materials, such as semi-finished products or multilayer materials based on cellulose, paper, polymers, metals, or combinations of these. Such shapes are ideal for preserving perishable foods, such as coffee, ensuring a longer shelf life (reducing waste due to expiration or spoilage and minimizing surface contact with the outside).

[0046] Hemispherical shapes with truncated poles are well-suited for deep drawing because they offer an optimal cavity depth-to-diameter ratio, and their progressive shape reduces the need for ultra-thin materials. Furthermore, these shapes can be manufactured with more rigid alloys containing a higher proportion of recycled content, resulting in more sustainable environmental and technical efficiencies.

[0047] Spherical shapes with truncated poles are suitable for discharge from similarly shaped extraction chambers of the machine, but separated in a central plane of symmetry. This allows the capsules to be loaded and unloaded, maintaining closer proximity to adjacent spherical shapes. The progressive spherical shape also facilitates discharge at discharge angles greater than 6 degrees.

[0048] The spherical shape with truncated poles can be inserted into the extraction system in both orientations (reversing NS or SN polarity) without affecting the final result of the extracted beverage. This means that the user does not need to worry about how to insert the capsule into the machine.

[0049] According to an alternative embodiment, a spherical shape with a truncated pole allows different extraction results to be obtained depending on the insertion direction relative to its plane of symmetry. This means that the user can obtain different drinks simply by positioning the capsule in the machine in different ways. This ability to vary the results without having to modify the user interface of the machine is a significant advantage of a spherical shape with a truncated pole (where the plane of symmetry is located in the middle of the capsule).

[0050] The spherical shape with truncated poles is a simple shape that is easily recognizable, archetypal, iconic and symbolic, and has historical relevance to the concept of the Easy Serving Espresso, which later became a universally popular standard.

[0051] The truncated portion may be made in a slightly concave manner to provide support for the coffee with a "spring effect" or even to allow gases to escape from the coffee within the package. This is just one example of possible performance variations.

[0052] In the following the terms "half-capsule" or "half-shell" will be used interchangeably with each other.

[0053] With the aid of a capsule according to a further structural variant described below, symmetry of the capsule about the plane of symmetry and thus greater ease of use for the user can be achieved: in this further structural variant, the capsule comprises two identical half-shells or half-capsules, which are arranged facing each other and mirror-imaged to each other.

[0054] By means of these features, the production process for manufacturing the capsule housing is simplified, for example by allowing the use of only one mold and / or only one production process for the upper and lower half shells, thereby reducing costs, reducing logistics, reducing waste, etc.

[0055] The bladder, comprising two mirror-image halves or half-shells, provides a uniform barrier effect against oxygen and moisture along its entire circumference. Unlike truncated-conical bladders—which have a membrane acting as a thin cover to meet functional requirements—there are no weak areas prone to uneven thickness, micropore porosity, or thin walls. With a spherical shape with truncated poles, the risk of overflow and outgassing is minimized under harsh conditions (such as internal CO2 / N2 pressure or low external pressure during air transport), without expansion or leakage through micropores or defective areas. This helps maintain a longer shelf life, reduces waste and rejects, and improves perceived reliability and quality.

[0056] The mirrored contour allows the user to visually identify and intuitively read the device in a symmetrical and inverted manner.

[0057] By means of a capsule shape having a truncated pole portion, which in one embodiment is flat, several advantages may be achieved.

[0058] The spherical shape with truncated poles allows the capsule to be stably positioned lying on a support surface, preventing it from rolling. This feature is useful during production, transport, packaging, handling, unpacking and actual use, improving presentation to the user.

[0059] The spherical shape of the capsule with truncated poles allows the capsule to be neatly stacked and saves space, for example in a secondary package. This helps to optimize space utilization, reduce weight, material and clearances, and protect the integrity of the capsule from possible external impacts or drops.

[0060] The flat shape of the truncated end of the capsule makes piercing the capsule easier and more controlled using a piercing member or device for injecting fluid into the capsule, which pierces transversely into the plane of the truncated end. This allows pressure to be applied perpendicular or almost perpendicular to the wall to be pierced, thereby improving ease of opening.

[0061] By piercing the capsule in one of its truncated poles, the capsule has small central inlet and outlet openings, thus reducing contact with the extraction chamber. This results in low contact residues (low cross-contamination), and a minimal impact on the extraction chamber temperature during percolation (the first or second consecutive beverage extraction). The effects of cross-contamination are particularly felt with ingredients that leave noticeable organoleptic traces (such as ginseng or barley) or are easily spoiled by oxidation (such as spoiled coffee). In particular, in the outlet area, it is advantageous to limit contact with the system for containing and channeling the flow toward the outside. Therefore, ideally, minimal contact with the machine at the outlet is desirable.

[0062] According to an embodiment, the capsule is pierced at the inlet by means of a central piercing member which may comprise one or more blades, tubes or cannulas rotatable about a central axis in the direction of flow.

[0063] During extraction of the beverage, the piercing member or opening device used to allow the extract to exit the capsule tears the flat exit area, or truncated end portion, of the capsule, which deforms outward under pressure. The piercing member is a fixed part of the extraction chamber and is positioned to rest on the capsule, but, depending on the embodiment, does not pierce the capsule during the step of closing the extraction chamber. During extraction, the flat area of ​​the capsule's truncated end portion surrounding the piercing member is unsupported and therefore collapses downward against the sharp edge of the piercing member, forming an opening in the outer wall of the capsule, which is subjected to hydraulic pressure. The filter inside the capsule expands, but thanks to its greater deformability and the specific shape of the piercing member, the filter does not rupture.

[0064] The filter retains its ability to retain solid particles while allowing the extract to pass through the opening formed. Only the head of the piercing element is sharp and not too deep, thus limiting uncontrolled damage to the outer wall to a small number of holes caused by tearing and ensuring sufficient support against external hydraulic stresses.

[0065] The geometry and properties of the piercing element can be different, but it is preferred to use a simple piercing element that forms a small amount of openings on the outer wall, preferably by means of shear stress rather than tensile stress, thereby providing sufficient support for the overlying filter element and ensuring a reliable channel for outflow.

[0066] According to an embodiment, for example for beverages where it is undesirable to generate excessive pressure during extraction, such as Americano or "drip" coffee that do not require foam, the spherical capsule with a truncated pole has larger dimensions, wherein the flat area is further from the center of the capsule, but the diameter of the spherical capsule remains unchanged. This allows the outlet of the capsule to be pierced when the chamber is closed before the extraction step, thereby achieving a greater overlap between the truncated pole and the inlet and outlet piercing elements.

[0067] To avoid excessive pressure during the extraction of the beverage, the capsule wall can alternatively be weakened in one or both truncated poles to reduce the pressure required to tear the capsule. This approach allows the use of a single piercing member and a single capsule size, thus simplifying the production process.

[0068] The flat truncated portion of the capsule, which is the thinnest after deep drawing, can be further weakened by a marking or another element. This weakened area allows for controlled tearing, allowing water to enter and the extract to exit the capsule. The embossing achieved through localized embossing can be customized based on the depth of penetration of the pin punch. The greater the depth, the easier it is to open the capsule, minimizing the pressure required for opening. Furthermore, thanks to the unique geometry of the piercing element, the final passage of the extract poses no further resistance, minimizing the formation of foam.

[0069] With the aid of a sac according to another structural variant, in which the sac comprises an annular flange in the equatorial region, for example having a planar contact area (head) for connecting the facing half-sacs, a hot-pressed seal can be obtained between the two half-sacs or half-shells, thereby strengthening them into a strong joint that is sealed and able to withstand mechanical stresses during the operating steps, as well as internal and external pressure differences in various situations of packaging, storage, transportation and handling before use.

[0070] For example, flat, face-to-face sealing achieved by heat sealing is the preferred and proven solution for mass production. However, other joining technologies are not excluded, such as ultrasonic / induction sealing, gluing with wax / adhesive, or press-fitting with adhesive sealing. This flexibility does not significantly impact the machine's support system or extraction chamber. Therefore, it is a reliable and flexible solution for development and production, compatible with other shapes and materials that may be used in future developments.

[0071] The defined flange stands out and is an important element for handling the capsule, helping to avoid contact (for hygienic reasons) with the area intended to come into contact with the liquid of the drink. Moreover, by making it easier to grip, the flange helps to avoid excessive compression of the spherical area, thus contributing to the reliability of the infiltration process and the correct functioning of the capsule during dispensing.

[0072] The flange provides a reinforcement element, dimensional stability, and ease of handling during production and assembly of the bladder.

[0073] According to a general embodiment, a capsule for preparing a predetermined amount of a drink suitable for drinking using an extractable product (e.g., ground coffee) includes a first capsule half and a second capsule half. Each capsule half includes a thin capsule wall. The thin capsule wall forms a first thin-walled portion in a single piece, which defines a generally hemispherical interior semi-chamber. Near its larger dimension, the capsule wall forms a second thin-walled portion in a single piece with the first thin-walled portion, which is curved to form an annular flange. The two capsule halves are arranged facing each other and mirror images of each other, and are connected to each other. At least one of the annular flanges of the capsule halves includes a free flange end edge forming a flange annulus, wherein the flange annulus comprises a total annular thickness h1 that is greater than the thickness h2 of the portion of the annular flange arranged to contact the adjacent capsule half (with an extension indicated by L in the figures).

[0074] By means of an embodiment comprising a flanged annular portion (e.g., a curled portion), a number of advantages can be obtained, such as the following. For example, the outer curled portion serves to maintain an appropriate distance between the capsules to prevent the capsules from sticking together when stacked one on top of the other (spacers for stacking), and facilitates transportation and temporary storage (ordered stacking is convenient for efficient use of space / packaging before production of half-capsules), and allows efficient industrial operation, with positioning and conveying by different robots during production. The outer protruding edge helps prevent attachment or friction when stacking the capsules, and serves as a spacer to facilitate manual separation. In addition, the outer protruding edge provides mechanical support for positioning the half-capsules on the conveyor belt through convenient holes or seats, and allows the assembled capsules to be gripped during packaging operations without contacting or squeezing the spherical portion.

[0075] The flange is an element that becomes very useful for deep drawing technology, which is the most suitable solution for single-dose capsules made of metal sheets or ultra-thin multilayer metals. The curling arranged at the free end of the flange also allows to hide irregularities or wavy edges caused by deep drawing.

[0076] The equatorial flange is crucial for understanding how to insert the capsule into a correspondingly shaped seat or support. Furthermore, it allows for differentiation between different capsule types without requiring multiple capsule shapes or profiles, or increasing the number of production, assembly, or packaging lines. This has a significant impact on the necessary industrial tooling investment and development time.

[0077] The flange also provides a flat surface suitable for forming a seal with, for example, a resilient member in the extraction chamber.

[0078] The flat surface of the flange that is in contact between the two facing half-capsules is suitable for being pressed or clamped by a rigid support (part of the extraction chamber) on the sealing part of the facing flanges during the pressurization of the internal contents, preferably the joint between two layers of varnish adhered to a metal sheet or cellulose-based paper. Whether the hydraulic pressure acts only on the inside of the capsule or also on the outside of the capsule in the space between the shell and the cavity that receives the extraction chamber, this rigid support is essential to ensure the required pressure level during extraction, which is generally in the range of 0 to 22 bars and preferably in the range of 7 to 18 bars. This optimal target pressure on the coffee mass ensures an extraction quality with a good balance of properties and sufficient foam. Obviously, a wider flange (joint) provides a more solid mechanical support, thereby increasing the resistance to opening, favoring the airtight seal and preventing the joint between the half-capsules from failing or completely separating.

[0079] The forces generated by the hydraulic pressure and the expansion of the compressed mass of granular / ground material inside the capsule can lead to significant stresses in the cells supporting the capsule. These stresses cannot be supported solely by the mechanical resistance of the thin capsule wall or its joints (crimping, hot pressing, sealing, gluing, etc.). Therefore, the flange provides an additional support area, allowing the extraction chamber to open in a symmetrical plane to continuously allow its discharge.

[0080] The edge of the capsule can be used as a reference point for expelling the capsule from the extraction chamber using, for example, a compression spring, a Belleville spring or a wave spring, or even a flexible element such as a lip seal, which seals by compression and, in the open state, opens and pushes against the edge of the capsule to expel the capsule from the machine.

[0081] For capsules with predetermined inlets and outlets (or in cases where the inlets and outlets are not random), precise positioning is essential. The flange or joint edge not only provides a visual / perceptual reference, but also provides a grip to position the capsule in a defined manner to prevent the bulb from being squeezed.

[0082] The edge serves as a control and guide element for controlled and directed movements in semi-automatic units, both as units with a horizontal and as units with a vertical closing axis.

[0083] The rim of the capsule prevents it from rolling over long distances. If the capsule is positioned on a raised edge that contacts a surface, it can only make circular movements within a limited radius, thus preventing it from moving away from its original position. This feature is useful in many situations, preventing the capsule from falling off surfaces such as work surfaces or kitchen counters.

[0084] The bladder's flange or edge may or may not include a flange ring or curl. The flange ring serves as a means of facilitating orderly securement within a secondary packaging, such as a box. Furthermore, the flange ring provides a grip for removing the bladder from the packaging. For loose bladders, the flange ring can provide a spacer to prevent damage and dents during transport.

[0085] The annular flange is a useful element for opening the capsule after use, providing a support edge for easy picking and handling of the capsule (especially when the capsule is still hot). Furthermore, the annular shape of the flange makes it easier to empty the capsule due to the gradual draft angle of the capsule compared to a cylindrical shape, thereby allowing for controlled separation of the used ingredients from the capsule. If a dedicated tool is used to empty the capsule and separate the package from the used product, the outer edge can serve as a support point.

[0086] The presence of the connecting flange allows for a seal between the facing flanges of the bladder halves, ensuring a long shelf life, withstanding internal pressure due to degassing, and being strong enough to withstand external pressure during air transport. The flange provides partial mechanical support during the dispensing step, limited to the periphery, so that dispensing facilitates opening approximately half of the seal to allow expansion of the pressurized ingredient. After use, the bladders can be opened and separated more easily due to the reduced resistance of the joint (which is now partially open due to the pressure load during dispensing).

[0087] The edge or flange of the capsule provides a visible surface on both sides for identifying the type of ingredients inside. This surface is very large, allowing the insertion of other information, such as text (e.g., SKU series), icons, pictograms or symbols (e.g., material group code, recycling code), numbers or dates (e.g., production date or expiration date), to help identify or indicate how to open, discard or use the capsule after use. Even if the available space is limited due to the idea of ​​minimizing the weight of the capsule for reasons of sustainability and cost, this information can be presented on the upper surface of the lid or truncated pole.

[0088] The flange can be colored to identify the type of ingredients or preparation. This identification can be performed with the help of an electronic reading system in the extraction machine or the equipment that prepares the product. The reading system can identify the color from the flange area as well as the lid or upper surface area. This will automate the preparation process without any input from the user.

[0089] By means of the capsule of the invention, and in particular by means of the provision of at least one flange ring (eg a curled portion), the following advantages can be achieved.

[0090] At least one or more curls on the edge of the bladder's flange are made, for example, of aluminum sheet material. Due to the shape of the mold, these curls can be formed directly during the deep-drawing step of the half-bladder. These curls help conceal the inevitable irregularities (wavy areas) that arise during the deep-drawing process and thus contribute to a uniform flange edge and, therefore, the bladder. Furthermore, these curls provide mechanical resistance and prevent the formation of sharp, easily deformed edges.

[0091] A flange ring (e.g., a curl) on the edge of the capsule allows for different capsule versions, such as a home version and a professional version, to be differentiated, allowing both capsules to be filled on the same production line with the same dosage and compression. The differentiation is achieved by arranging the curls (e.g., overlapping in a mirror-image arrangement for the home version and adjacent to each other for the professional version), while maintaining the same width and area of ​​connection as the flat flange section (heat-sealed, glued, curled, or a combination thereof).

[0092] The curled portions on the capsule edges serve to keep the capsule or shell halves at a distance from each other, allowing them to be stacked close together without sticking. This allows for robotic handling during the assembly and filling steps, preventing surface friction and reducing direct contact between the capsule or shell halves.

[0093] By providing at least one filter element, the following advantages can be achieved.

[0094] A possible embodiment of the filter element according to the invention is in the form of a disc obtained by cutting or punching from a roll or sheet of industrial and household grade recyclable or decomposable material, the diameter of the filter element being greater than the diameter of the capsule region of the truncated pole.

[0095] The filter material piece is, for example, a piece of material of spunbond nonwoven fabric / thermally bonded spun nonwoven fabric / nonwoven fabric, filter paper, cellulose, laminate or meltblown needle-punched fabric, etc. The filter material piece has a sealing layer according to an embodiment but not necessarily, to allow the filter material piece to be fastened to the inner area of ​​the semi-capsule or capsule half shell, in particular to allow the filter material piece to be fastened to the concave wall near the truncated pole section.

[0096] According to an embodiment, the filter element is sealed to the concave surface of a half-shell, for example made of metal (e.g., aluminum), by means of heat sealing to the largest circumferential portion of the filter element disc. According to an embodiment, even if the larger circumferential surface of the filter element is adapted to the shape of the cover, the filter element forms lateral folds, thereby forming umbrella-shaped channels. According to an embodiment, for larger circumferential surfaces, although the filter element is located within the contour of the cover, the filter element still forms lateral pleats, thereby forming umbrella-shaped channels. In the water injection area, these channels with micro-passages produce a shower effect, thereby properly spreading the water at the central inlet over the entire porous mass or uncompacted dissolved solubles. However, at the outlet of the half-shell or half-capsule, these channels are squeezed and help to partially lift the filter element from the inner surface of the shell, thereby facilitating the discharge of the dispensed beverage.

[0097] By means of the proposed embodiment, the filter partially limits the required and allowed expansion of the porous mass of the ingredient to be extracted during the wetting / permeation step, thereby avoiding the bypass effect or flow around the porous mass in order to facilitate rapid and complete wetting over the entire porous hemisphere.

[0098] Thanks to the proposed embodiment, the filter (which is also intact at the end of dispensing) prevents the aspiration / migration of solid particulate ingredients or ingredients dissolved in the circuit upstream of the capsule inlet, which could clog and block the passages, soil / stick movable parts (such as the center of the solenoid valve), and form scales with residues and fats or sugars that could contaminate / significantly change the taste of the continuous extraction or permeation, or block or even reversibly / irreversibly damage the system.

[0099] By means of the proposed embodiment, the filter in the coffee outlet of the half-shell prevents the outflow / migration of solid particles or undissolved ingredients in the circuit downstream of the capsule, which could clog, block the passage and reversibly / irreversibly block or damage the system.

[0100] The following describes the permeation dynamics that can be achieved by any of the above or below embodiments.

[0101] According to an embodiment, piercing and coffee outflow are achieved during extraction. The method for preparing a coffee beverage using the above-mentioned capsule containing ground roasted coffee comprises inserting the capsule into an extraction unit, which is also called an extraction device or extraction machine, or simply a machine. The extraction unit comprises a container for the capsule and a piercing element for allowing water to enter (an injection or piercing device for injecting fluid into the capsule) and a coffee outlet (or an opening device for allowing the extract to leave the capsule). The shape of the container is formed to accommodate and support the entire surface of the capsule except for the truncated pole part, which is not supported by the shape of the chamber but can be deformed in a concave or convex manner under pressure. The piercing element is positioned in the area of ​​the extraction unit facing the truncated pole part of the capsule.

[0102] According to an embodiment, the opening of the water inlet area is achieved by means of a piercing due to closing the chamber.During the entire extraction period, the piercing element remains inside the capsule, thereby penetrating the capsule.

[0103] According to an embodiment, pressurized hot water is injected through the bladder piercing element so that the water flows mainly inside the bladder and is delivered to a specific area located between the aluminum shell and the filter positioned in the upper part of the bladder, which area is limited to the area of ​​the truncated pole.

[0104] The filter promotes and facilitates rapid and complete wetting over the entire porous surface and also up to the peripheral areas (wetting).

[0105] According to embodiments, the permeation dynamics utilize internal hydraulic pressure to open the capsule (expanding it against the integrated piercing element). Because the capsule is initially closed in the coffee outlet area, water diffuses across the porous coffee mass and into the peripheral area, resulting in efficient infiltration / wetting due to the extended diffusion of water and the healing of any cracks in the porous mass caused by external impact. Furthermore, this process results in the desired foam formation, aided by the expansion of the ingredients and the absorption of aromatic gases (primarily CO2).

[0106] This process is carried out by the capsule being opened during extraction against a central piercing body or opening means for the extraction to flow out of the capsule. After the introduction of water, the pressure inside the capsule, which reaches a relatively high level (between 5 and 12 bars), causes the outer capsule wall to deform and expand in the region of the truncated pole located at the outlet, due to the lack of support from the walls of the extraction chamber.

[0107] This expansion is controlled by the proportional piercing body, which causes a partial rupture of the capsule and a controlled opening. This allows the coffee to flow out after wetting.

[0108] According to an embodiment, the piercing element has an opening, channel, or passageway to allow the extract to pass through. The piercing element does not filter the contents of the capsule, but only serves to open the outer barrier wall of the capsule in a controlled manner, thereby avoiding excessive tearing and supporting the application and deformation of the filter and ingredients. The piercing support prevents the capsule from collapsing along with the internal filter and ingredients.

[0109] According to an embodiment, an internal filter is provided near the truncated pole, fixed in the upper and lower half-shells. The filter located on the upper half-shell prevents particles from rising / being sucked into the water injection area, while the filter located on the lower half-shell prevents the ground coffee from spilling into the cup.

[0110] According to an embodiment, the coffee flow depends on the particle size of the ground coffee contained in the capsule, in particular the percentage of fine particles. Other factors that influence the flow include dosage, temperature, wetting, pump, freshness, resistance of the porous mass, filter and passage.

[0111] According to an embodiment, the coffee outlet is pierced while the extraction unit or device is closed. By modifying the shape of the capsule (e.g., a spherical shape), or simply increasing the height of the half-shell, or, as previously described, by reducing the pressure required to open the opening against the outer piercing body, both the inlet and outlet can be pierced simultaneously while the extraction chamber is closed. This method of opening is preferred, for example, when preparing Americano (drip) coffee or tea, or for dissolving soluble ingredients (e.g., coffee, barley, ginseng, tea, cocoa, or milk), in order to avoid or limit the formation of foam.

[0112] In this case, although the piercing element is a fixed part of the chamber, it interferes more with the capsule and appears to overlap with the outer contour of the capsule. As a result, the piercing element is able to penetrate the capsule better, thereby forming an opening at the beginning of extraction and allowing a smaller initial pressure peak and a wider flow of beverage out of the capsule. BRIEF DESCRIPTION OF THE DRAWINGS

[0113] Further characteristics and advantages of the present invention will become apparent from the following description of a preferred embodiment of the invention given by way of non-limiting illustration, with reference to the accompanying drawings, in which:

[0114] - Figure 1 shows an axonometric view of a capsule according to a first embodiment, wherein the flange rings are arranged to overlap in a direction orthogonal to the plane of the intermediate capsule;

[0115] - Figure 2 Shown Figure 1an axonometric view of the capsule in FIG, with the capsule having separated parts, thereby highlighting the two capsule halves and the two filter elements near the truncated poles, but without showing the extractable product mass;

[0116] - Figure 3 for Figure 1 Axonometric view of the capsule in FIG, the capsule having separate parts and cut along a plane passing through the radial direction RR and the center of the two opposite truncated poles;

[0117] - Figure 4 Shown Figure 3 A cross-sectional view of a bladder having separate components;

[0118] - Figure 5 yes Figure 3 Axonometric section of a detail of the flange of the half-bladder;

[0119] - Figure 6 Shown Figure 1 A side view of a detail of the flanges of the two bladder halves of the connection of the bladder;

[0120] - Figure 7 Shown Figure 6 Detailed radial cross-section of

[0121] - Figure 8 and Figure 9 Shown Figure 6 side view and radial section of details;

[0122] - Figure 10 A cross-sectional view showing details of the truncated pole portion, and Figure 11 Shown Figure 10 A cross-sectional view of a detail of the truncated pole portion in FIG, highlighting the filter element and the concave wall connecting the filter element to the half-bladder;

[0123] - Figure 12 、 Figure 13 and Figure 14 shows five capsule halves according to a first embodiment, wherein the flanged ring extends into the same half of the space in which the first thin-walled portion with the truncated cover extends, wherein the capsule halves are superimposed and highlighting the additional function of the flanged ring (here in the form of a curl), namely for spacing each capsule half from the adjacent capsule half;

[0124] - Figure 15The following is shown in an axonometric view: a user's hand grasps the capsule by grasping its truncated poles with his / her thumb and his / her index finger; the capsule rests stably on a plane with one of its truncated poles; and in the event of an impact, the capsule rolls against the flange on the plane; and a half capsule rests stably on a plane with one of its truncated poles; and in the event of an impact, the capsule rolls against its flange on the plane;

[0125] - Figure 17 、 Figure 18 、 Figure 19 and Figure 20 Shown are: a view of a first capsule, wherein the flange has flange annular portions overlapping in a direction orthogonal to the plane of the intermediate capsule, and a detail of a radial cross-section of the flange annular portions; and a view of a second capsule, wherein the flange annular portions are arranged radially side by side, and a detail of a radial cross-section of the flange annular portions;

[0126] - Figure 21 、 Figure 22 and Figure 23 shows five capsule halves according to a second embodiment, in which the flange ring extends into the half-space opposite the half-space in which the first thin-walled portion with the truncated cover extends, wherein the capsule halves are superimposed and highlighting the additional function of the flange ring (here in the form of a curl) for separating each capsule half from the adjacent capsule half;

[0127] - Figure 24 shows an axonometric view of a capsule according to another embodiment, wherein the flange rings are arranged radially side by side;

[0128] - Figure 25 Shown Figure 24 an axonometric view of the capsule in FIG, having separated parts, thereby highlighting the two capsule halves and the two filter elements positioned close to the truncated poles, but without showing the extractable product mass;

[0129] - Figure 26 Shown Figure 24 Axonometric view of the capsule in FIG, the capsule having separate parts and cut along a plane passing through the radial direction RR and the center of the two opposite truncated poles;

[0130] - Figure 27 Shown Figure 26 A cross-sectional view of a bladder having separate components;

[0131] - Figure 28 Shown Figure 24 Axonometric section of a detail of the flange of the half-bladder;

[0132] - Figure 29 Shown Figure 24 A side view of a detail of a cross section of the flanges of the two coupled half-bladders of the bladder;

[0133] - Figure 30 Shown Figure 29 Detailed radial cross-section of

[0134] - Figures 31 to 34 shows an axonometric view, a side view, and a radial cross-sectional view of a capsule according to another embodiment, wherein the thin wall has a truncated polyhedral spherical shape;

[0135] - Figure 35 and Figure 36 shows an axonometric view of a capsule according to another embodiment, wherein the thin wall has a spherical shape with a groove;

[0136] - Figures 37 to 40 shows an axonometric view, an axonometric view cut along a radial plane, a cross-sectional view, and a detail of a flange according to a further embodiment, wherein the flange has no flange ring;

[0137] - Figure 41 、 Figures 42 to 43 shows an axonometric view of a capsule according to a further embodiment, an axonometric view cut along a radial plane, and a detail of a coupled flange, wherein the flange annular portion has a mirror-imaged annular channel shape;

[0138] - Figure 44 and Figure 45 shows a sectional view of a capsule according to a further embodiment and a view with a detail of said section, wherein a spherical capsule with a truncated pole portion has a flange without a flange ring and with a different radial extension;

[0139] - Figure 46 、 Figure 47 、 Figure 48 and Figure 49 shows an axonometric view, an axonometric view cut along a radial plane, a cross-sectional view, and a detail of a coupled flange of a capsule according to another embodiment, wherein the flange annular portion has the shape of an annular channel, wherein two channels are arranged radially side by side;

[0140] - Figure 50 、 Figure 51 and Figure 52An axonometric view and a radial cross-sectional view according to a radial plane of another embodiment of a capsule are shown, wherein the first portion of the thin wall of each capsule half is shaped like a spherical half-cap, and in this case there is no truncated polar portion; according to this embodiment, the flange rings overlap one another in a direction transverse to the mid-plane;

[0141] - Figure 53 、 Figure 54 and Figure 55 An axonometric view and a radial cross-sectional axonometric view according to a radial plane of another embodiment of a capsule are shown, wherein the first portion of the thin wall of each capsule half is shaped like a spherical half-cap, and in this case there is no truncated polar portion; according to this embodiment, the flanged annular portions are arranged radially side by side;

[0142] - Figure 56 a cross-sectional view showing the opened extraction device of the machine with the capsule inserted;

[0143] - Figure 57 Shown Figure 56 A cross-sectional view of the extraction device enclosed in the capsule;

[0144] - Figure 58 Shown Figure 57 a cross-sectional view of a detail of the extraction device in , thereby highlighting the interaction between the opening means for allowing the extract to leave the capsule and the truncated pole portion intended for opening to allow the extract to flow out, and wherein the integrity of the filter element is highlighted;

[0145] - Figure 59 、 Figure 60 、 Figure 61 、 Figure 62 Shown are cross-sectional views of: an opened extraction device with a capsule inserted; Figure 59 an extraction device enclosed in a capsule; Figure 59 Detail of an extraction device in FIG, highlighting the seating for the flanged annular portions arranged to overlap in a direction orthogonal to the plane of the intermediate capsule, and two flanges overlapping on the same seating, said two flanges having flanged annular portions arranged radially side by side, highlighting the impossibility of housing these annular portions in this seating, preventing the insertion into this extraction device of a type of capsule not suitable for this particular seating for overlapping flanged annular portions;

[0146] - Figure 63 、 Figure 64 、 Figure 65 、 Figure 66Shown are cross-sectional views of: an opened extraction device with a capsule inserted; Figure 63 an extraction device enclosed in a capsule; Figure 63 Detail of an extraction device in , highlighting the seating for flanged annular portions arranged radially side by side; and two flanges superimposed on the same seating, said two flanges having flanged annular portions overlapping in a direction perpendicular to the plane of the intermediate capsule, highlighting the impossibility of housing these annular portions in this seating, preventing the insertion into the extraction device of a type not suitable for an extraction device having this particular seating for overlapping flanged annular portions; and seating for flanged annular portions arranged radially side by side, suitable for receiving capsules with opposite polarity;

[0147] - Figure 67 、 Figure 68 、 Figure 69 、 Figure 70 、 Figure 71 The invention shows cross-sectional views of: an extraction device sealed on a capsule; details of piercing means for injecting a fluid into the capsule, which, when the extraction device is sealed, pierces the thin wall without piercing the filter at the inlet; and three steps of deforming a truncated pole portion for opening the capsule to allow the extract to flow out, wherein, when the extraction device is sealed, the thin wall of the truncated pole portion is not opened but deforms as the pressure of the fluid introduced into the capsule increases until it is cut at the opening means for allowing the extract to leave the capsule, thereby forming an exit opening without damaging the filter arranged close to the truncated pole portion, which is deformed without being cut;

[0148] - Figure 72 and Figure 73 Axonometric and side views showing the six steps of the production process, wherein the first step shows the punching of the thin-walled disc strip, the second step shows the deep drawing of the lower capsule half by means of a punch and a die, the third step shows the filling with the extractable product, the fourth step shows the compacting of the extractable product into a spherical extractable product mass, the fifth step shows the coupling of the upper capsule half in a mirror-image manner, and the sixth step shows the heat sealing of the upper flange to the lower flange;

[0149] - Figure 74 An axonometric view of a device for emptying a used capsule for separating a used extractable product from a thin capsule wall is shown with the components separated, wherein the collecting chamber, the used capsule, and the cover accommodating the piston are shown with the components separated;

[0150] - Figure 75 Shown Figure 74A longitudinal cross-sectional view of the device and the used capsule;

[0151] - Figures 76 to 78 A longitudinal cross-section showing three steps of emptying a used capsule, wherein Figure 76 The capsule is shown resting on the edge of the collection chamber via the annular flange of its lower capsule half, wherein a seating portion accommodates the flanged annular portion of the lower capsule half, and then the cover is fitted outside the collection chamber and locks the annular flange of the upper capsule half via its inner edge and receives the flanged annular portion of the upper capsule half in the opposing seating portion, and wherein the piston slides in a telescopic manner in the seating portion provided in the cover until the piston rests on the upper pole of the upper capsule half; Figure 77 The piston is shown having completed its extension and retraction stroke, thereby fully entering the cover and squeezing the used capsule, thereby tearing the thin capsule wall by means of an opening formed in the used capsule by an opening device for allowing the extract to exit the capsule, thereby allowing the extractable product to flow out as the capsule is gradually squeezed; Figure 78 The opening of the emptying device and the removal of the thin capsule wall of the extractable product collected at the bottom of the collecting chamber are shown;

[0152] - Figure 79 Shown Figure 78 Axonometric drawing of the components in;

[0153] - Figure 80 、 Figure 81 and Figure 82 shows an axonometric view, a side view, and a cross-sectional view of a capsule, wherein a half capsule has a first thin-walled portion with a cylindrical wall section and a spherical cap wall section with a truncated polar portion, wherein the entire first thin-walled portion is circumscribed by an outer hemisphere and inscribed by an inner hemisphere, wherein the difference in diameter between the two hemispheres is less than 10%;

[0154] - Figure 83 and Figure 84 An axonometric view, a side view and a cross-sectional view of a capsule are shown, wherein a semi-capsule has a first thin-walled portion with a cylindrical wall section and a spherical cap wall section without a truncated pole portion, wherein the entire first thin-walled portion is inscribed in the outer hemisphere and circumscribed in the inner hemisphere, wherein the difference in diameter between the two hemispheres is less than 10%. DETAILED DESCRIPTION

[0155] The present invention will now be described in detail with reference to the accompanying drawings to enable those skilled in the art to make and use the invention. Various modifications to the described embodiments will become readily apparent to those skilled in the art, and the general principles described may be applied to other embodiments and applications without departing from the scope of the invention as defined in the appended claims. Therefore, the present invention should not be considered limited to the embodiments described and shown, but should be accorded the widest scope of protection consistent with the features described and claimed.

[0156] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly used by those of ordinary skill in the art to which the present invention belongs. In the event of a conflict, the present specification (including the definitions provided) shall prevail. In addition, the examples are provided for illustrative purposes only, and therefore these examples should not be considered as limiting.

[0157] To facilitate understanding of the embodiments described herein, reference will be made to some specific embodiments and specific language will be used to describe these specific embodiments. The terminology used herein is intended to describe specific embodiments only and is not intended to limit the scope of the invention.

[0158] In the following, when the term "extractable product" is used, it will refer to extractable products and / or soluble products, such as ground, roasted and freeze-dried coffee, such as barley coffee and ginseng coffee, for example.

[0159] Hereinafter, when the term "thin-walled capsule that provides mechanical resistance" is used, it means that the wall can withstand handling and minor impacts without deformation, but cannot withstand being pierced by a flat tool to form an opening. For example, a thin wall is understood to mean a wall made of sheet metal, which is commonly known from its use in the production of commercially available coffee capsules. For example, the thin wall can also be made of paper, cellulose pulp, or recyclable paper-based materials that are compostable for home or industrial use and coated with one or more barrier and heat-sealable layers.

[0160] Hereinafter, when the term "total spherical volume portion or contour portion" is used, it will be understood as any shape that is inscribed and circumscribed by two spherical caps, which are spaced apart from each other by less than 10% of the maximum diameter De of the outer spherical cap, preferably less than 5% of the maximum diameter De of the outer spherical cap. For example, the total spherical volume portion or contour portion refers to any shape that is inscribed and circumscribed by two spherical caps, which are spaced apart from each other by less than 10% of the maximum diameter De of the outer spherical cap, preferably less than 5% of the maximum diameter De of the outer spherical cap, and which have the same center. Depending on the embodiment (but not necessarily for all embodiments), this definition also applies to the shape of the sac after the pressurized fluid is injected into the sac at a pressure of 0 bar to 22 bar, preferably 5 bar to 12 bar, and even more preferably 7 bar to 12 bar.

[0161] Hereinafter, when the term "thin bladder wall forming a barrier" is used, it will be understood that the material is impermeable to the acquisition or transmission of gases and moisture and provides a barrier, even a complete barrier, to fats, oils and water. In addition, the material should also be resistant to corrosion by substances with a pH value between 4 and 9. Examples of such barriers include materials comprising or consisting of one or more aluminum foils having at least one aluminum layer. Aluminum foils having a thickness exceeding 0.025 mm (0.001 inches) are impermeable to light, gases (including oxygen) and water vapor. Thinner foils become slightly permeable due to tiny pores created by the production process, but thinner foils are acceptable in some cases.

[0162] Furthermore, for decomposable and biodegradable packaging (e.g. cellulose-based packaging), the packaging will be made of a material in accordance with EN 13432 or a material having a gas permeability (gas permeability), in particular an oxygen permeability (oxygen permeability), of 1 cm3 / (m2 d bar) to 500 cm3 / (m2 d bar) at 23°C and 50% relative humidity, i.e. 2 cm3 / (m2 d bar) to 400 cm3 / (m2 d bar) in accordance with DIN 53380-3:1998-07.

[0163] For example, the material has a water vapor transmission rate (water vapor permeability) of 15 g / (m2d) to 100 g / (m2d) at 23°C and 50% relative humidity, i.e. 20 g / (m2d) to 80 g / (m2d) according to ISO 7783:2018.

[0164] For example, the material has a water vapor transmission rate (water vapor permeability) of 20 g / (m2d) to 250 g / (m2d) at 23°C and 85% relative humidity, i.e. 25 g / (m2d) to 200 g / (m2d) according to ISO 7783:2018.

[0165] For example, the gas permeability of a material means that under tropical conditions, OTR (oxygen transmission rate) is <0.5cc / m2*day and WVTR (water vapor transmission rate) is <2g / m2*day.

[0166] According to a general embodiment, a capsule 1 for preparing a predetermined quantity of a beverage suitable for drinking using an extractable product 2 , for example ground coffee, comprises a first capsule half 3 and a second capsule half 4 .

[0167] Each capsule half 3 , 4 comprises a thin capsule wall 5 , 6 .

[0168] The thin bladder walls 5, 6 are formed with first thin wall portions 7, 8 in one piece, defining inner half-chambers 9, 10 of generally spherical shape.

[0169] The bladder walls 5 , 6 are formed, close to their larger dimension D, with second thin-walled portions 11 , 12 formed in one piece with the first thin-walled portions 7 , 8 , which are bent to form annular flanges 13 , 14 .

[0170] The two capsule halves 3 , 4 are arranged facing each other and mirror images of each other so that at least a portion of the annular flanges 13 , 14 are in contact when the two capsule halves 3 , 4 are joined to each other.

[0171] The first thin-walled portions 7 and 8 have contours with substantially the same volume.

[0172] The first, mirror-image-facing, thin-walled portions 7 , 8 essentially form a profile having an overall substantially spherical volume with truncated pole portions 15 , 16 .

[0173] According to a general embodiment, a capsule 1 for preparing a predetermined quantity of a beverage suitable for drinking using an extractable product 2 , for example ground coffee, comprises a first capsule half 3 and a second capsule half 4 .

[0174] Each half-bladder 3 , 4 comprises a thin bladder wall 5 , 6 which has mechanical resistance and substantially forms a barrier to air, in particular to oxygen and moisture.

[0175] For example, the thin capsule walls 5, 6 can be pierced with a tool such as a needle or a knife and can resist weak pressure if grasped by hand.

[0176] The thin capsule walls 5 , 6 are formed with first thin wall portions 7 , 8 in one piece, defining generally hemispherical inner half-chambers 9 , 10 suitable for housing the extractable product 2 .

[0177] The capsule walls 5, 6 are formed with second thin-walled portions 11, 12, which are integral with the first thin-walled portions 7, 8, near their larger dimension D or the equatorial diameter of the inner half-chambers 9, 10, and which are bent to form annular flanges 13, 14 which protrude outwardly in the radial direction RR away from the first thin-walled portions 7, 8.

[0178] The two capsule halves 3 , 4 are arranged facing each other and mirror images of each other so that at least a portion of the annular flanges 13 , 14 are in contact when the two capsule halves 3 , 4 are joined to each other.

[0179] The first thin-walled portions 7 and 8 have contour portions with substantially the same volume.

[0180] The first, mirror-image-facing, thin-walled portions 7 , 8 essentially form a profile having an overall substantially spherical volume with truncated pole portions 15 , 16 .

[0181] According to an embodiment, said truncated pole portions 15 , 16 have a thin-walled portion 7 , 8 remote from said greater dimension D.

[0182] According to an embodiment, each of said truncated pole portions 15 , 16 , when intact before extraction, comprises a planar or slightly concave section of said thin capsule wall 5 , 6 which is slightly turned towards the inside of said first thin-walled portion 7 , 8 .

[0183] According to an embodiment, said first thin-walled portions 7 , 8 , with the exception of said truncated pole portions 15 , 16 , form contours that are substantially equidistantly spaced from the center C of the capsule.

[0184] According to an embodiment, said first thin-walled portions 7 , 8 facing each other substantially form a sphere with truncated poles 15 , 16 , each first thin-walled portion forming a hemispherical cap profile with truncated poles.

[0185] According to an embodiment, said first thin-walled portions 7 , 8 facing each other form a first inner half-chamber 9 and a second inner half-chamber 10 , together defining a single inner chamber 25 having a substantially spherical contour with truncated poles.

[0186] According to an embodiment, the thin bladder walls 5, 6 are made of a rigid or semi-rigid material.

[0187] According to an embodiment, said thin capsule walls 5 , 6 comprise at least one aluminum layer.

[0188] According to an embodiment, said thin capsule walls 5 , 6 comprise at least one aluminum layer and are obtained by deep drawing.

[0189] According to an embodiment, the thin bladder walls 5, 6 have a uniform thickness. The term "uniform thickness" should be understood to mean a substantially constant thickness, i.e., a constant thickness, except for variations in thickness produced by deep drawing operations or similar processes, and specific weak points formed to facilitate the opening of the bladder. For example, a uniform thickness is essentially achieved by deep drawing a sheet of material having a constant, uniform thickness. Through operations such as deep drawing, the thickness can vary by 10% to 15%. According to an embodiment, the thin wall thickness can vary from 60 microns to 300 microns. According to an embodiment, the thickness is 100 microns, of which at least 70 microns are metal, such as aluminum. According to an embodiment, the thickness is 300 microns, of which at least 200 microns are cellulose.

[0190] According to an embodiment, the truncated pole portions 15 , 16 of the facing half-capsule 3 , 4 have the same dimensions as one another.

[0191] According to an embodiment, the first thin-walled portion 7 of the first capsule half 3 having the truncated pole portion 15 and the first thin-walled portion 8 of the second capsule half 4 having the truncated pole portion 16 are identical to each other.

[0192] According to an embodiment, the first capsule half 3 and the second capsule half 4 are identical to each other.

[0193] According to an embodiment, each annular flange 13 , 14 comprises a flat flange section 15 , 16 .

[0194] According to an embodiment, each annular flange 13, 14 comprises a flat flange section 15, 16. The two capsule halves 3, 4 are arranged facing each other and mirror images of each other so that at least a portion of the flat flange sections 15, 16 are in contact.

[0195] According to an embodiment, the capsule 1 has a mirrored shape with respect to its median plane M. According to an embodiment, the median plane passes through points equidistantly spaced from the truncated poles 15 , 16 .

[0196] According to an embodiment, the first half-capsule 3 and the second half-capsule 4 face each other in a mirror-image manner, wherein the recess of the first half-capsule 3 and the recess of the second half-capsule 4 face each other to form a first inner half-chamber 9 and a second inner half-chamber 10, thereby together forming a single inner chamber 25, which has a generally spherical shape with truncated poles 15, 16.

[0197] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical contour 17 .

[0198] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with truncated poles 15 , 16 .

[0199] According to an embodiment, the assembly of said first thin-walled portion 7 of the first semi-capsule and said first thin-walled portion 8 of the second semi-capsule has a profile received between two spheres, one sphere being circumscribed and on the outside and one sphere being inscribed and on the inside, the difference in diameter of the two spheres being less than 10%, preferably less than 5%.

[0200] According to an embodiment, the assembly of said first thin-walled portion 7 of the first capsule half and said first thin-walled portion 8 of the second capsule half has a profile with truncated poles 15, 16 received between two spheres, one sphere being circumscribed and on the outside and one being inscribed and on the inside, the difference in diameter of the two spheres being less than 10%, preferably less than 5%.

[0201] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 .

[0202] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with truncated poles 15 , 16 .

[0203] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with flat faces.

[0204] According to an embodiment, the assembly of said first thin-walled portion 7 of the first capsule half and said first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with flat face portions and truncated pole portions 15 , 16 .

[0205] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with flat faces, each of which is triangular.

[0206] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with flat faces and truncated poles 15 , 16 , each face having a triangular shape.

[0207] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with flat faces, each of which is pentagonal.

[0208] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with flat faces and truncated poles 15 , 16 , each face being pentagonal.

[0209] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with flat facets, each of which is circular.

[0210] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical polyhedral profile 18 with flat faces and truncated poles 15 , 16 , each face being rounded.

[0211] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with a convex portion 19 .

[0212] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with truncated poles 15 , 16 and a convex portion 19 .

[0213] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with a helical groove 20 .

[0214] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with truncated poles 15 , 16 and recesses 20 .

[0215] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with meridian grooves 21 .

[0216] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with meridian grooves 21 and truncated poles 15 , 16 .

[0217] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with parallel grooves 22 .

[0218] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with parallel grooves 22 and truncated poles 15 , 16 .

[0219] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with a helical groove 23 .

[0220] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with a helical groove 23 and truncated poles 15 , 16 .

[0221] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with a step 24 .

[0222] According to an embodiment, the assembly of the first thin-walled portion 7 of the first capsule half and the first thin-walled portion 8 of the second capsule half has a spherical profile 17 with a step 24 and truncated poles 15 , 16 .

[0223] According to an embodiment, the difference between the maximum equatorial diameter D of the capsule 1 and the pole distance H measured between the truncated poles 15 , 16 is less than 10%, preferably less than 5%.

[0224] According to an embodiment, the ratio between the distance of the truncated pole portions 15 , 16 and the maximum equatorial diameter D is between 90% and 75%.

[0225] According to an embodiment, the truncated pole portions 15 , 16 are equidistantly spaced from the center C of the first thin-walled portion 7 and the first thin-walled portion 8 of the pair of first and second capsule halves.

[0226] According to an embodiment, the at least one portion of the annular flanges 13 , 14 of the two half-bladders 3 , 4 positioned in contact with each other is heat sealed to each other so that the interior chamber 25 formed by the first interior half-chamber 9 and the second interior half-chamber 10 is sealed relative to the environment outside the bladder 1 .

[0227] According to an embodiment, at least one of the annular flange 13 of the semi-capsule 3 or the annular flange 14 of the semi-capsule 4 includes a free flange end edge 26 or 27, thereby forming a flange annular portion 28 or 29, wherein the flange annular portion 28 or 29 includes an annular portion thickness h1 or a height in a direction perpendicular to the middle separation plane M between the two semi-capsule 3, 4, and the annular portion thickness h1 or height is greater than the height of the portion of the annular flange 13 or 14 arranged to contact the adjacent semi-capsule 4 or 3, or the flange thickness h2 or the height in a direction perpendicular to the middle separation plane M between the two semi-capsule 3, 4.

[0228] According to an embodiment, at least one of the annular flange 13 of the semi-capsule 3 or the annular flange 14 of the semi-capsule 4 includes a free flange end edge 26 or 27, which forms a flange annular portion 28 or 29, wherein the flange annular portion 28 or 29 includes a total annular portion thickness, which is greater than the thickness of the portion of the annular flange 13 or 14 that is arranged to be in contact with the adjacent semi-capsule 4 or 3.

[0229] According to an embodiment, both half-capsules 3 and 4 comprise said flange annular portions 28 and 29 .

[0230] According to an embodiment, both half-capsules 3 and 4 comprise said flange rings 28 and 29 , and said flange rings 28 , 29 are arranged in a mirror-image manner with respect to each other.

[0231] According to an embodiment, both half-capsules 3 and 4 include flange annular portions 28 and 29 arranged side by side in a radial direction RR, wherein, according to an embodiment, the radial direction is determined as the radial direction of the spherical contour of the first thin-walled portion 7 of the first half-capsule or the first thin-walled portion 8 of the second half-capsule, or as the radial direction of a sphere circumscribed or inscribed in the first thin-walled portion 7 of the first half-capsule or the first thin-walled portion 8 of the second half-capsule.

[0232] According to an embodiment, the flange ring 28 or 29 is annular in shape.

[0233] According to an embodiment, said flange annulus 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27 .

[0234] According to an embodiment, said flange annular portion 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27 and is formed in the shape of an overall annular volume.

[0235] According to an embodiment, the flange annulus 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27 , the flange annulus 28 or 29 being formed in one piece with the flange 13 or 14 and being shaped in the manner of a flange end curl 30 or 31 .

[0236] This end curl 30 or 31 is not intended to interact with an extraction device or machine, since it is not intended to deform so as to form a hydraulic seal between the capsule 1 and the extraction chamber of said extraction device or machine.

[0237] According to an embodiment, said flange annulus 28 or 29 extends so as to be completely contained within the half-space defined by the middle capsule plane M and where said thin-walled portion 7 or 8 of the capsule half is situated, forming said flange 13 or 14 .

[0238] According to an embodiment, the flange annular portion 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27, and the flange annular portion 28 or 29 is formed as an integral piece with the flange 13 or 14 and is formed in the form of a flange end curled portion 30 or 31; the flange end curled portion 30 or 31 extends to completely remain in the following half space: the half space is defined by the middle capsule plane M, and the thin-walled portion 7 or 8 of the half capsule is located in the half space, thereby forming the flange 13 or 14.

[0239] According to an embodiment, said flange end curl 30 or 31 extends from the flat flange portion 13 or 14 towards the half-space defined by the middle capsule plane M in which the first thin-walled portion 7 or 8 of the first capsule half is located.

[0240] According to an embodiment, the flange annular portion 28 or 29 extends together with the flange 13 or 14 to basically remain in the following half space: the half space is defined by the middle capsule plane M and the flange 13 or 14 from which the flange annular portion 28 or 29 extends, and the half space is opposite to the position of the thin-walled part 7 or 8 of the half capsule, thereby forming the flange 13 or 14.

[0241] According to a general embodiment, the flange annular portion 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27, and the flange annular portion 28 or 29 is formed as an integral piece with the flange 13 or 14, and is formed in the form of a flange end curled portion 30 or 31; the flange end curled portion 30 or 31 extends together with the flange 13 or 14 to basically remain in the following half space: the half space is defined by the middle capsule plane M and the flange 13 or 14, and the half space is opposite to the position of the thin-walled portion 7 or 8 of the half capsule, thereby forming the flange 13 or 14.

[0242] According to an embodiment, the flange end curled portion 30 or 31 includes an outer annular curled section 32 and an inner annular curled section 33 folded inside the outer annular curled section 32 .

[0243] According to an embodiment, said thin-walled portion 7 or 8 of the semi-capsule forms with said outer annular curled section 32 a flange channel 34 having a flat bottom.

[0244] According to a general embodiment, the thin-walled portion 7 or 8 of the semi-capsule and the outer annular curled section 32 form a section having a profile of a power function with an odd exponent in a cross section containing the radial direction RR.

[0245] According to an embodiment, the capsule 1 comprises two half capsules 3 , 4 that are mirror images of each other and that are in contact in a middle plane M.

[0246] According to an embodiment, the capsule 1 includes two half capsules 3 and 4 that are mirror images of each other, and the two half capsules 3 and 4 are in contact on a middle plane M, and wherein both half capsules 3 and 4 include flange annular portions 28 and 29; and wherein the flange annular portions are raised so as not to contact the middle plane M.

[0247] According to an embodiment, at least one of the truncated pole portions 15 , 16 is suitable for receiving at least one piercing device 35 for injecting a fluid into the capsule 1 .

[0248] According to an embodiment, the truncated pole portions 15 , 16 are each suitable for receiving at least one piercing device 35 for injecting a fluid into the capsule 1 .

[0249] According to an embodiment, at least one of said truncated pole portions 15 , 16 is adapted to receive at least one opening means 36 to allow the extract to leave the capsule 1 .

[0250] According to an embodiment, said truncated pole portions 15 , 16 are each adapted to receive at least one opening means 36 to allow the extract to leave the capsule 1 .

[0251] According to an embodiment, said capsule 1 is suitable for being inserted into an extraction chamber of a system 55 for preparing a predetermined amount of a drink using an extractable product.

[0252] According to an embodiment, the capsule 1 is adapted to be inserted in any polar orientation into the extraction chamber of the system 55 for preparing a predetermined amount of beverage with an extractable product, and thus also with the truncated poles 15 , 16 of the capsule 1 inverted.

[0253] According to an embodiment, a filter element 37 is present in the inner half-chambers 9 , 10 , at least close to at least one of the truncated pole portions 15 , 16 .

[0254] Correspondingly, inside the inner half-chambers 9 , 10 , a filter element 37 is present, at least close to at least one of the truncated pole portions 15 , 16 , which filter element 37 is suitable for receiving at least one piercing device 35 .

[0255] Correspondingly, inside the inner half-chambers 9 , 10 there is a filter element 37 , at least close to at least one of the truncated pole portions 15 , 16 , which is suitable for receiving at least one opening device 35 .

[0256] Correspondingly, inside the inner half-chambers 9 , 10 , a filter element 37 is present, at least close to at least one of the truncated pole portions 15 , 16 , which filter element 37 is suitable for receiving at least one piercing device 35 .

[0257] Correspondingly, inside the inner half-chambers 9 , 10 there is a filter element 37 , at least close to at least one of the truncated pole portions 15 , 16 , which is suitable for receiving at least one opening device 35 .

[0258] According to an embodiment, said filter 37 separates the extractable product 2 from said first thin-walled portion 7 and / or 8 at said truncated portion 15 and / or 16 .

[0259] According to an embodiment, the filter element 37 is disc-shaped.

[0260] According to an embodiment, the filter element 37 is connected to the first thin-walled portion 7 and / or 8 .

[0261] According to an embodiment, the filter element 37 is connected to the first thin-walled portion 7 and / or 8 outside the truncated pole portion 15 and / or 16 .

[0262] According to an embodiment, the filter element 37 is connected to the first thin-walled portion 7 and / or 8 in a concave portion of the first thin-walled portion 7 and / or 8 .

[0263] According to an embodiment, the filter element 37 comprises a filter element edge 38 and the filter element 37 is connected to the thin walls 7 , 8 along the entire filter element edge 38 .

[0264] According to an embodiment, said filter element 37 is made of a material capable of being heat-sealed to the thin walls 7 , 8 .

[0265] According to an embodiment, the filter element 37 comprises a filter element edge 38 and at least the filter element 37 is made of a material that can be heat-sealed to the thin walls 7 , 8 .

[0266] According to an embodiment, the thin capsule walls 5 , 6 comprise a varnish layer at least on their side edges facing the first 9 or second 10 inner half-chamber.

[0267] According to an embodiment, the filter 37 is made of a material that is suitable for gripping, for example by heat sealing, to the varnish layer present in the thin capsule walls 5, 6 when the thin capsule walls 5, 6 are heated. In other words and according to an embodiment, the filter 37 is sealed to the thin capsule walls 5, 6 by melting the heat sealing material of the thin capsule walls and allowing the melted heat sealing material to at least partially enter the structure of the filter 37 and anchor the filter 37 to the thin capsule walls 5, 6.

[0268] According to an embodiment, said filter 37 is made of a material comprising at least one cellulose-based layer.

[0269] According to an embodiment, the filter 37 comprises a filter edge 38 and at least the filter edge 38 can be heat-sealed to the varnish layer.

[0270] According to an embodiment, said filter 37 allows the extract to pass through but blocks the extractable product particles 2 .

[0271] According to a general embodiment, a system 55 for preparing a predetermined amount of a drink using an extractable product 2 comprises a capsule 1 as defined in any of the above embodiments and an extraction device 56 comprising a receiving portion 57 for accommodating the capsule 1, piercing means 35 for injecting a fluid into the capsule, and opening means 36 for allowing the extract to leave the capsule.

[0272] According to an embodiment, the extraction device 56 comprises a flange ring seat 57 suitable for receiving the flange rings 28 , 29 of the capsule 1 .

[0273] According to an embodiment, the extraction device 56 comprises a flange ring seating 57 suitable for receiving the flange rings 28, 29 of the capsule 1 when the two capsule halves 3, 4 comprise mirror-image flange rings 28, 29 overlapping in a direction orthogonal to the middle capsule plane M.

[0274] According to an embodiment, the extraction device 56 includes a flange ring seat 57, which is suitable for receiving the flange rings 28, 29 of the capsule 1 when the two semi-capsule members 3, 4 include flange rings 28, 29 arranged side by side in the radial direction relative to the first thin-walled parts 7, 8 of the semi-capsule members.

[0275] According to an embodiment, the extraction device 56 includes a flange ring seat 57, which is suitable for receiving the flange rings 28, 29 of the capsule 1 when the two semi-capsule members 3, 4 include flange rings 28, 29 arranged side by side in the radial direction relative to the first thin-walled parts 7, 8 of the semi-capsule members.

[0276] According to an embodiment, the extraction device 56 comprises a flange ring seating 57 suitable for receiving the flange rings 28, 29 of the capsule 1 when the two capsule halves 3, 4 comprise mirror-image flange rings 28, 29 overlapping in a direction orthogonal to the middle capsule plane M.

[0277] According to a general embodiment, a method for extracting a beverage from a capsule 1 comprising an extractable product 2 as defined in any of the above embodiments, when the capsule is inserted into a system 55 as defined in any of the above embodiments, comprises the following steps:

[0278] When the capsule 1 is inserted into the receiving portion 57 of the extraction device 56 , the receiving portion 57 is closed so as to pierce at least one of the truncated polar portions 15 , 16 of the capsule halves by the piercing means 35 for injecting a fluid into the capsule;

[0279] Fluid is injected into the capsule 1 through the piercing means 35 for injecting fluid into the capsule.

[0280] According to an embodiment, the following additional step is also provided: fluid is injected into the capsule 1 by means of the piercing device 35 for injecting fluid into the capsule to increase the pressure of the fluid in the single internal chamber 25, thereby deforming the opposite truncated pole portions 16, 15 until the opposite truncated pole portions 16, 15 interfere with the opening device 36, thereby allowing the extract to leave the capsule by opening the capsule and extracting the extract of the extractable product.

[0281] According to an embodiment, said filter (37) remains deformed but intact during the deformation of the opposite truncated pole portions 16, 15 and their opening by said opening means 36 for the extraction to leave the capsule.

[0282] According to an embodiment, the pressure inside the capsule 1 reaches a value between 5 and 12 bar.

[0283] According to an embodiment, during the closure of said receptacle 57 , since said receptacle 57 houses the capsule 1 , said opening means 36 for allowing the extract to leave the capsule open the opposite truncated poles 16 , 15 .

[0284] According to an embodiment, at least one of the truncated pole portions 15, 16 includes a weakened pole portion 39, wherein the thin wall 7, 8 has a reduced and weakened thickness portion to allow opening by interaction of the capsule 1 with at least one of the piercing device 35 for injecting fluid into the capsule and / or the opening device 36 for allowing the extract to leave the capsule.

[0285] According to an embodiment, the capsule 1 is inserted into the receiving portion 57 with any polarity, thereby allowing opening and extraction in any orientation in which the capsule 1 is inserted.

[0286] According to an embodiment, the capsule 1 is inserted into the receiving portion 57, wherein the first truncated pole portion 15 faces the puncturing device 35 for injecting fluid into the capsule and the opposite truncated pole portion 16 faces the opening device 36 for allowing the extract to leave the capsule, or the opposite truncated pole portion 16 faces the puncturing device 35 for injecting fluid into the capsule and the first truncated pole portion 15 faces the opening device 36 for allowing the extract to leave the capsule.

[0287] According to a general embodiment, the method for producing a half-capsule 3 , 4 according to any of the above-described embodiments comprises the following steps:

[0288] Cutting out a disc from the sheet material, the disc being suitable for producing a thin bladder wall 5, 6 which has mechanical resistance and essentially forms a barrier to oxygen and moisture;

[0289] The disc is deep-drawn to form a first thin-walled portion 7, 8 in one piece defining an inner semi-chamber 9, 10 of substantially hemispherical shape suitable for receiving the extractable product 2, and a second thin-walled portion 11, 12 in one piece with the first thin-walled portion 7, 8, formed near the larger dimension D or equatorial diameter of the inner semi-chamber 9, 10, which is bent to form an annular flange 13, 14 that projects outwardly away from the first thin-walled portion 7, 8 on RR.

[0290] According to an embodiment, flange rings 28 , 29 are produced at the ends of said annular flanges 13 , 14 during a deep-drawing step.

[0291] According to an embodiment, pairs of half-capsule parts 3 , 4 are produced which are identical to each other.

[0292] According to an embodiment, the two half-capsules 3, 4 are deep drawn to produce a first flange annular portion 28 with a smaller radial dimension and a second flange annular portion 29 with a larger radial dimension, and so that the two flange annular portions 28, 29 are arranged side by side in the radial direction RR when the two half-capsules face each other.

[0293] According to an embodiment, the method for producing the capsule 1 includes the above steps to obtain two identical half capsules 3 and 4, and also includes a step of connecting the two half capsules 3 and 4, so that the two half capsules 3 and 4 are arranged facing each other and are mirror images of each other to form the capsule 1.

[0294] According to a general embodiment, a capsule 1 for preparing a predetermined amount of a drink suitable for drinking using an extractable product 2, such as ground coffee, comprises a first capsule half 3 and a second capsule half 4. Each capsule half 3, 4 comprises a thin capsule wall 5, 6. The thin capsule wall 5, 6 is formed with a first, thin-walled portion 7, 8 formed in one piece, thereby defining a generally spherical inner semi-chamber 9, 10. Near its larger dimension D, the capsule wall 5, 6 is formed with a second, thin-walled portion 11, 12 formed in one piece with the first, thin-walled portion 7, 8, which is curved to form annular flanges 13, 14. The two capsule halves 3, 4 are arranged facing each other, mirror images of each other, and are connected to each other. At least one of the annular flanges 13 or 14 of the semi-capsule 3 or 4 comprises a free flange end edge 26 or 27 forming a flange annular portion 28 or 29, wherein the flange annular portion 28 or 29 comprises a total annular portion thickness that is greater than the thickness of the portion of the annular flange 13 or 14 that is arranged to be in contact with the adjacent semi-capsule 4 or 3.

[0295] According to a general embodiment, a capsule 1 for preparing a predetermined quantity of a beverage suitable for drinking using an extractable product 2 , for example ground coffee, comprises a first capsule half 3 and a second capsule half 4 .

[0296] The capsule halves 3 , 4 each comprise a thin capsule wall 5 , 6 with mechanical resistance, for example a thin wall which can be pierced by a needle and which can withstand weak pressure if grasped by hand, which essentially forms a barrier to oxygen and moisture.

[0297] The thin capsule walls 5 , 6 are formed with first thin wall portions 7 , 8 in one piece, thereby defining generally hemispherical inner half-chambers 9 , 10 suitable for housing the extractable product 2 .

[0298] The capsule walls 5, 6 are formed, close to their larger dimension D or the equatorial diameter of the inner half-chambers 9, 10, with second thin-walled portions 11, 12 which are integral with the first thin-walled portions 7, 8 and which are bent to form annular flanges 13, 14 which project outwardly away from the first thin-walled portions 7, 8 in the radial direction RR.

[0299] The two capsule halves 3 , 4 are arranged facing each other and mirror images of each other so that at least a portion of the annular flanges 13 , 14 are in contact when the two capsule halves 3 , 4 are joined to each other.

[0300] The first thin-walled portions 7 and 8 have contour portions with substantially the same volume.

[0301] At least one of the annular flange 13 of the semi-capsule 3 or the annular flange 14 of the semi-capsule 4 includes a free flange end edge 26 or 27, which forms a flange annular portion 28 or 29, wherein the total annular portion thickness included in the flange annular portion 28 or 29 is greater than the thickness of the portion of the annular flange 13 or 14 that is arranged to contact the adjacent semi-capsule 4 or 3.

[0302] According to a general embodiment, at least one of the annular flange 13 of the semi-capsule 3 or the annular flange 14 of the semi-capsule 4 includes a free flange end edge 26 or 27, which forms a flange annular portion 28 or 29, wherein the flange annular portion 28 or 29 includes an annular portion thickness or a height in a direction perpendicular to the middle separation plane M between the two semi-capsule 3, 4, and the annular portion thickness or height is greater than the height of the portion of the annular flange 13 or 14 arranged to contact the adjacent semi-capsule 4 or 3 or the height in a direction perpendicular to the middle separation plane M between the two semi-capsule 3, 4.

[0303] According to a general embodiment, the flange rings 28 , 29 are end portions of the flanges 13 , 14 folded in a U-shaped or V-shaped manner.

[0304] According to a general embodiment, the flange ring portions 28 , 29 are end portions of the flanges 13 , 14 folded into an inverted U-shape or an inverted V-shape.

[0305] According to a general embodiment, the first thin-walled parts 7, 8 are in the shape of spherical caps.

[0306] According to a general embodiment, the first thin-walled portions 7 , 8 each form a hemispherical cover profile, and when the first thin-walled portions 7 , 8 face each other, the first thin-walled portions 7 , 8 substantially form a sphere.

[0307] According to a general embodiment, both half-capsules 3 and 4 comprise said flange annular portions 28 and 29 .

[0308] According to a general embodiment, both half-capsules 3 and 4 comprise said flanged rings 28 and 29 , and said flanged rings 28 , 29 are arranged as mirror images of each other.

[0309] According to a general embodiment, both half-capsules 3 and 4 comprise said flange annular portions 28 and 29 arranged adjacent to each other in radial direction RR.

[0310] According to a general embodiment, the radial direction is determined as the radial direction of the spherical contour portion of the first thin-walled part 7 of the first semi-capsule or the first thin-walled part 8 of the second semi-capsule, or is determined as the radial direction of a sphere circumscribed or inscribed in the first thin-walled part 7 of the first semi-capsule or the first thin-walled part 8 of the second semi-capsule.

[0311] According to a general embodiment, the flange ring portion 28 or 29 is annular in shape.

[0312] According to a general embodiment, said flange annulus 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27 .

[0313] According to a general embodiment, the flange annular portion 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27 and is formed to have the shape of an overall annular volume.

[0314] According to a general embodiment, the flange annulus 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27, the flange annulus 28 or 29 being formed as one piece with the flange 13 or 14 and being shaped in the manner of a flange end curl 30 or 31.

[0315] According to an embodiment, said flange annulus 28 or 29 extends so as to be completely contained within the half-space defined by the middle capsule plane M and where said thin-walled portion 7 or 8 of the capsule half is situated, forming said flange 13 or 14 .

[0316] According to a general embodiment, the flange annular portion 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27, and the flange annular portion 28 or 29 is formed as an integral piece with the flange 13 or 14 and is formed in the form of a flange end curled portion 30 or 31; the flange end curled portion 30 or 31 extends to be completely retained in the following half space: the half space is defined by the middle capsule plane M, and the thin-walled portion 7 or 8 of the half capsule is located in the half space, thereby forming the flange 13 or 14.

[0317] According to a general embodiment, said flange end curl 30 or 31 extends from the flat flange portion 13 or 14 towards the half-space defined by the capsule mid-plane M where the first thin-walled portion 7 or 8 of the first capsule half is located.

[0318] According to a general embodiment, the flange annular portion 28 or 29 extends together with the flange 13 or 14 from which it extends to basically remain in the following half space: the half space is defined by the middle capsule plane M and the flange 13 or 14 from which the flange annular portion 28 or 29 extends, and the half space is opposite to the position of the thin-walled portion 7 or 8 of the half capsule, thereby forming the flange 13 or 14.

[0319] According to a general embodiment, the flange annular portion 28 or 29 is formed by a folded portion of the free flange end edge 26 or 27, and the flange annular portion 28 or 29 is formed as an integral piece with the flange 13 or 14 and is formed in the form of a flange end curled portion 30 or 31; the flange end curled portion 30 or 31 extends together with the flange 13 or 14 to basically remain in the following half space: the half space is defined by the middle capsule plane M and the flange 13 or 14, and the half space is opposite to the position of the thin-walled portion 7 or 8 of the half capsule, thereby forming the flange 13 or 14.

[0320] According to a general embodiment, the flange end curl 30 or 31 includes an outer annular curl section 32 and an inner annular curl section 33 folded inside the outer annular curl section 32 .

[0321] According to an embodiment, said thin-walled portion 7 or 8 of the semi-capsule forms with said outer annular curled section 32 a flange channel 34 having a flat bottom.

[0322] According to a general embodiment, the thin-walled portion 7 or 8 of the semi-capsule and the outer annular curled section 32 form a profile in a section containing the radial direction RR in which at least one section has a power function with an odd exponent.

[0323] According to a general embodiment, the capsule 1 comprises two mirror-image capsule halves 3 , 4 , which are in contact in a middle plane M.

[0324] According to a general embodiment, the capsule 1 includes two half capsules 3 and 4 that are mirror images of each other, and the two half capsules 3 and 4 are in contact on a middle plane M, and wherein both half capsules 3 and 4 include flange annular portions 28 and 29; and wherein the flange annular portions are raised so as not to contact the middle plane M.

[0325] In order to meet specific and possible needs, those skilled in the art may make various changes and adjustments to the above embodiments, and may replace various elements with other functionally equivalent elements without departing from the scope of the appended claims.

[0326] In the following, an emptying device 40 for used capsules and a method for emptying a used, waste capsule of a used extractable product, separating the used extractable product from the thin capsule walls 5 , 6 will be described.

[0327] According to an embodiment, the used capsule emptying device 40 for separating the used extractable product 2 from the thin capsule walls 5, 6 includes a collecting chamber 41, which is, for example but not necessarily, cup-shaped, and includes a collecting chamber opening edge 44, which defines a collecting chamber opening 45, which is suitable for receiving at least the first thin-walled part 7 or the second thin-walled part 8 of the half capsule, so that the annular flange 13 of the first half capsule or the annular flange 14 of the second half capsule rests on the collecting chamber opening edge 44.

[0328] The collection chamber opening edge 44 comprises a collection chamber seating portion 50 near its edge opposite to the collection chamber opening 45 , which is adapted to receive the first flange ring portion 28 or the second flange ring portion 29 .

[0329] The emptying device 40 for used capsules further comprises a tubular cover 42 comprising a cover opening 46 suitable for receiving a freely sliding piston 43 .

[0330] The cover 42 includes an outer cover annular portion 47 and an inner cover annular portion 48. The outer cover annular portion 47 is suitable for being fitted around the collection chamber 44 on the outside, and the inner cover annular portion 48 is suitable for being placed against the collection chamber opening edge 44 through its cover edge 49, thereby clamping the annular flange 13 of the first half-capsule and the annular flange 14 of the second half-capsule of the used capsule 1 placed on the collection chamber 44 between the edge 49 and the edge 44.

[0331] The cover 42 further includes a cover seating portion 51 adapted to receive the second flange ring portion 29 or the first flange ring portion 28 .

[0332] For example, the cover seating portion 51 is provided between the outer cover annular portion 47 and the inner cover annular portion 48 .

[0333] The piston 43 can slide in the cover opening 46 to interfere with the used capsule 1 and press the used capsule 1 toward the collecting chamber 44 .

[0334] The method for separating the used extractable product 2 from the thin walls 5 , 6 of the used capsule 1 is briefly described below.

[0335] The figures show three steps for emptying a used capsule 1 . Figure 76 The capsule 1 is shown resting with the annular flange of its lower capsule half, for example the annular flange 13 of the first capsule half, on the collection chamber opening edge 44 , so that the flange ring of the capsule 1 , in this example the first flange ring 28 , is arranged in the collection chamber seat 50 .

[0336] The cover 42 is fitted outside the collection chamber 41 and lowered until the cover edge 49 of the cover 42 abuts the annular flange 14 of the second half-capsule, thereby clamping the annular flange 14 of the second half-capsule against the annular flange 13 of the first half-capsule and the collection chamber opening edge 44.

[0337] The piston 43 then slides in a telescopic manner in a seat provided in the cover, the cover opening 46 , until the first half of the upper capsule, ie the truncated pole portion 15 of the second capsule half 4 , rests on the upper pole portion.

[0338] exist Figure 77 In the process, the piston 43 completes its extension and retraction stroke, thereby fully entering the cover 42 and squeezing the used capsule 1 to tear the thin capsule wall by means of an opening formed in the capsule 1 by an opening device for allowing the extract to leave the capsule, thereby allowing the used extractable product to flow out as the capsule 36 is gradually squeezed and opened to release the used extractable product 2.

[0339] Figure 78 It is shown that the used capsule is opened with the emptying device 40 and the thin capsule walls, ie the second thin capsule wall 6 and the first thin capsule wall 5 are removed, the extractable product 2 is emptied and collected at the bottom of the collecting chamber 41 .

[0340] According to an embodiment, the capsule 1 according to the structural variation includes capsule halves 3 and 4, each comprising a first thin-walled portion 7 of a first capsule halves and / or a first thin-walled portion 8 of a second capsule halves, wherein the first thin-walled portion 7 and the first thin-walled portion 8 have a cylindrical wall section 52 and a spherical cover wall section 53 with truncated poles. The assembly of the cylindrical wall section 52 and the spherical cover wall section 53 with truncated poles, i.e., the entire first thin-walled portion, is inscribed in an outer hemisphere 60 and circumscribed in an inner hemisphere 61, wherein the diameter difference between the two hemispheres 60 and 61 is less than 10%, preferably less than 5%.

[0341] According to an embodiment, a capsule 1 according to another structural variant comprises capsule halves 3, 4, each comprising a first thin-walled portion 7 of a first capsule halves and / or a first thin-walled portion 8 of a second capsule halves, the first thin-walled portion 7 and the first thin-walled portion 8 having a cylindrical wall section 52 and a completely spherical cover wall section 54, i.e. without truncated poles 15 or 16. The assembly of the cylindrical wall section 52 and the completely spherical cover wall section 54, i.e. the entire first thin-walled portion, is inscribed in an outer hemisphere 60 and circumscribed in an inner hemisphere 61, wherein the difference in diameter between the two hemispheres 60 and 61 is less than 10%, preferably less than 5%.

[0342] Reference numerals

[0343] 1 bladder

[0344] 2 Extractable products or ingredients

[0345] 3 First half capsule

[0346] 4 Second half capsule

[0347] 5. First thin bladder wall

[0348] 6 Second thin bladder wall

[0349] 7. First thin-walled portion of the first half-bladder

[0350] 8. First thin-walled portion of the second half-bladder

[0351] 9 First inner half chamber

[0352] 10 Second inner half chamber

[0353] 11. Second thin-walled portion of the first half-bladder

[0354] 12. Second thin-walled portion of the second half-bladder

[0355] 13 annular flange of the first half capsule

[0356] 14 annular flange of the second half capsule

[0357] 15 The truncated end of the first capsule half

[0358] 16 The truncated end of the second capsule half

[0359] 17 Thin-walled portion with spherical contour

[0360] 18 Thin-walled portion with a spherical polyhedral contour and a flat surface

[0361] 19 Convex portion with thin-walled portion having spherical contour

[0362] 20 Grooves with thin-walled sections having spherical contours

[0363] 21 Meridian groove with thin-walled portion having spherical contour

[0364] 22 Parallel grooves with thin-walled sections having spherical contours

[0365] 23 Spiral groove with thin-walled portion having spherical contour

[0366] 24 Stepped portion with thin-walled portion of spherical contour

[0367] 25 single internal chamber

[0368] 26 First free flange end edge

[0369] 27 Second free flange end edge

[0370] 28 first flange annular portion

[0371] 29 Second flange annular portion

[0372] 30 First flange end curled portion

[0373] 31 Second flange end curled portion

[0374] 32 outer annular curled section

[0375] 33 inner annular curled section

[0376] 34 Flange channel between the ball part and the curled part

[0377] 35. Piercing device for injecting fluid into bladder

[0378] 36. Opening means for allowing the extract to leave the capsule

[0379] 37 filter element

[0380] 38 filter edge

[0381] 39 Weakened polar part

[0382] 55 System

[0383] 56 Extraction Equipment

[0384] 57 bladder receiving portion

[0385] 40 Used capsule emptying device

[0386] 41 Collection Room

[0387] 42 Cover

[0388] 43 Piston

[0389] 44 Collection chamber opening edge

[0390] 45 Collection chamber opening

[0391] 46 Cover opening

[0392] 47 Outer cover annular portion

[0393] 48 inner cover annular portion

[0394] 49 Cover edge

[0395] 50 Collection room seating

[0396] 51 Cover seat

[0397] 52 cylindrical wall portion

[0398] 53 Spherical cover wall segment with truncated pole

[0399] 54 Completely spherical cap

[0400] 55 System

[0401] 56 Extraction Equipment

[0402] 57 bladder receiving portion

[0403] 60 Outer Hemisphere

[0404] 61 Inner Hemisphere

[0405] C Center

[0406] RR radial direction

[0407] D is the diameter of the sphere in the inner half chamber

[0408] M Middle capsule plane

[0409] H is the distance between the truncated poles.

[0410] De is the diameter of the circumscribed or external sphere

[0411] Di is the diameter of the inscribed, internal sphere.

[0412] h1 thickness of the upper annular part

[0413] h2 flange thickness

[0414] L The portion of the annular flange that contacts the adjacent half-bladder

[0415] Df flange diameter.

Claims

1. A capsule (1) for preparing a predetermined amount of a drink suitable for drinking using an extractable product and / or a soluble product (2), for example ground coffee, the capsule (1) comprising: - a first capsule half (3) and a second capsule half (4); - wherein each half-bladder (3, 4) comprises a thin bladder wall (5, 6) having mechanical resistance and substantially forming a barrier to oxygen and moisture; - the thin capsule wall (5, 6) is formed in one piece with a first thin wall portion (7, 8) defining a substantially hemispherical inner half-chamber (9, 10) suitable for containing the extractable product (2); - wherein the thin capsule wall (5, 6) is formed with a second thin-walled portion (11, 12) in one piece with the first thin-walled portion (7, 8) near the larger dimension (D) of the thin capsule wall (5, 6) or near the equatorial diameter of the inner half-chamber (9, 10), the second thin-walled portion (11, 12) being bent to form an annular flange (13, 14) projecting radially outwardly (RR) away from the first thin-walled portion (7, 8); - the two half-capsules (3, 4) are arranged facing each other and mirroring each other so that at least one portion of the annular flanges (13, 14) is in contact when the two half-capsules (3, 4) are joined to each other; It is characterized in that - at least one of the annular flanges (13 or 14) of the semi-capsule (3 or 4) comprises a free flange end edge (26 or 27), said free flange end edge (26 or 27) forming a flange annular portion (28 or 29), wherein said flange annular portion (28 or 29) comprises a total annular portion thickness that is greater than the thickness of said portion of the annular flange (13 or 14) arranged to be in contact with the adjacent semi-capsule (4 or 3).

2. The capsule (1) according to claim 1, wherein The capsule (1) comprises one or more of the following features: The first thin-walled parts (7, 8) have contour parts with substantially the same volume; or among them At least one of the annular flanges (13 or 14) of the semi-capsule (3 or 4) includes a free flange end edge (26 or 27), and the free flange end edge (26 or 27) forms a flange annular portion (28 or 29), wherein the flange annular portion (28 or 29) includes an annular portion thickness (h1) that is greater than the height or flange thickness (h2) of the portion of the annular flange (13 or 14) arranged to contact the adjacent semi-capsule (4 or 3).

3. The capsule (1) according to claim 1 or 2, wherein: The flange annular portion (28, 29) is an end portion of the flange (13, 14) folded in a U-shape or a V-shape. Or among them, The flange annular portion (28, 29) is an end portion of the flange (13, 14) folded into an inverted U shape or an inverted V shape.

4. The capsule (1) according to any one of the preceding claims, wherein The first thin-walled portion (7, 8) is formed in the manner of a spherical cap; or among them The first thin-walled parts (7, 8) are each formed with a hemispherical cap contour and substantially form a sphere when facing each other.

5. The capsule (1) according to any one of the preceding claims, wherein Both capsule halves (3, 4) comprise said flanged annular portion (28, 29).

6. The capsule (1) according to any one of the preceding claims, wherein Both half-bladders (3, 4) comprise said flange rings (28, 29), and said flange rings (28, 29) are arranged to be mirror images of each other.

7. The capsule (1) according to any one of claims 1 to 5, wherein: Both capsule halves (3, 4) comprise said flanged annular portions (28, 29) arranged side by side in a radial direction (RR), wherein said radial direction is defined relative to the radial direction of said thin capsule walls (5, 6) defining an inner semi-chamber (9, 10) that is substantially hemispherical in shape; or among them Both half-capsule members (3, 4) include the flange annular portions (28, 29), which are arranged side by side in a radial direction (RR), wherein the radial direction is determined as the radial direction of the spherical contour portion of the first thin-walled portion (7) of the first half-capsule member or the spherical contour portion of the first thin-walled portion (8) of the second half-capsule member, or the radial direction is determined as the radial direction of a sphere inscribed in the first thin-walled portion (7) of the first half-capsule member or the first thin-walled portion (8) of the second half-capsule member or the first thin-walled portion (7) of the first half-capsule member or the first thin-walled portion (8) of the second half-capsule member.

8. The capsule (1) according to any one of the preceding claims, wherein The flange ring portion (28 or 29) is annular in shape.

9. The capsule (1) according to any one of the preceding claims, wherein The flange annular portion (28 or 29) is formed by a folded portion of the free flange end edge (26 or 27).

10. The capsule (1) according to any one of the preceding claims, wherein The capsule (1) comprises one or more of the following features: The flange annular portion (28 or 29) is formed by a folded portion of the free flange end edge (26 or 27) and is formed into a shape having an overall annular volume; and wherein The flange annular portion (28 or 29) is formed by a folded portion of the free flange end edge (26 or 27), the flange annular portion (28 or 29) is formed as a single piece with the flange (13 or 14), and the flange annular portion (28 or 29) is formed in the manner of a flange end curl (30, 31); Or among them, The flange annular portion (28 or 29) extends to be completely retained in the following half space: the half space is defined by the middle capsule plane (M) and the thin-walled portion (7 or 8) of the half capsule is located in the half space, thereby forming the flange (13 or 14); Or among them, The flange annular portion (28 or 29) is formed by a folded portion of the free flange end edge (26 or 27), the flange annular portion (28 or 29) is formed as a single piece with the flange (13 or 14), and the flange annular portion (28 or 29) is formed in the manner of a flange end curl (30 or 31); the flange end curl (30 or 31) extends to remain completely within the same following half space: the half space is defined by the middle capsule plane (M) and the thin-walled portion (7 or 8) of the half capsule is located in the half space, thereby forming the flange (13 or 14); Or among them, The flange end curl (30 or 31) extends from the flat flange portion (13 or 14) towards the half space defined by the middle capsule plane (M) and where the first thin-walled portion (7 or 8) of the first capsule half is located.

11. The capsule (1) according to any one of the preceding claims, wherein The capsule (1) comprises one or more of the following features: The flange annular portion (28 or 29) and the flange (13 or 14) from which the flange annular portion (28 or 29) extends extend together to be substantially retained in the following half space: the half space is defined by the middle capsule plane (M) and the flange (13 or 14) from which the flange annular portion (28 or 29) extends and the half space is opposite to the position of the thin-walled portion (7, 8) of the half capsule, thereby forming the flange (13 or 14); Or among them, The flange annular portion (28 or 29) is formed by a folded portion of the free flange end edge (26 or 27), the flange annular portion (28 or 29) is formed as a single piece with the flange (13 or 14), and the flange annular portion (28 or 29) is formed in the form of a flange end curl (30 or 31); the flange end curl (30 or 31) extends together with the flange (13 or 14) to be substantially retained in the following half space: the half space is defined by the middle capsule plane (M) and the flange (13 or 14) and the half space is opposite to the position of the thin-walled portion (7 or 8) of the half capsule, thereby forming the flange (13 or 14); Or among them, The flange end curled portion (30 or 31) includes an outer annular curled section (32) and an inner annular curled section (33), wherein the inner annular curled section (33) is folded inside the outer annular curled section (32); Or among them, The thin-walled portion (7 or 8) of the semi-capsule and the outer annular curled section (32) form a flange channel (34) with a flat bottom; Or among them, The thin-walled portion (7 or 8) of the semi-capsule and the outer annular curled section (32) form a profile having a power function with an odd exponent on a cross section including the radial direction RR, or among them The capsule (1) comprises two half capsules (3, 4) that are in contact with each other on a middle plane (M) and are mirror images of each other; Or among them, The capsule (1) comprises two mirror-image capsule halves (3, 4) contacting each other on a middle plane (M), wherein both capsule halves (3, 4) comprise a flanged ring portion (28, 29); and wherein the flanged ring portion is raised so as not to contact the middle plane (M).

Images