Capsule made from wood pulp-based material with an optimized outflow of edible products and the production process thereof

Abstract

This invention refers to a capsule (1) made from wood pulp-based material for the preparation of edible products, the capsule comprising a recipient (2) demarcated by a side wall (21), a bottom wall (22), and a top wall (23), wherein said bottom wall (22) comprises a blind-grooved element (4) arranged on its inner side (31), wherein the blind-grooved element (4) comprises a first blind groove (41) and a second blind groove (42) arranged within the first blind groove (41). This invention also refers to the capsule production process and is encompassed by the edible products production industry

Description

CAPSULE MADE FROM WOOD PULP-BASED MATERIAL WITH AN OPTIMIZED OUTFLOW OF EDIBLE PRODUCTS AND THE PRODUCTION PROCESS THEREOF

[0001] This invention refers to single-use capsules made from wood pulp-based material for the preparation of edible products, such as American coffee, tea, or other products, and the fabrication process thereof. This invention falls within the purview of the food industry, more specifically the edible products production industry.

[0002] The state of the art includes several solutions related to single-use capsules for the preparation of edible products, such as American coffee, tea, and other products.

[0003] The capsules consist of small recipients containing the edible product, used in machines compatible therewith and that allow quick preparation of the edible product. The capsule generally comprises two elements: a base cup and a lid. The base cup has a bottom that is either completely closed or pre-perforated; either way, it is perforated through punctures made by the edible products machine in which the capsule is placed. The mouth of the capsule cup may have a rim around it that provides a surface for gluing the lid, which generally comprises a plastic lid, an aluminum sheet, and a micro-perforated plastic or paper filter.

[0004] When capsules for use in edible product machines are placed in the machine, they are perforated on both sides by a mechanized punch system, through which some are perforated when the lid is closed on the machine compartment where the capsule is placed, while others are perforated by a punch mechanism built into the machine that is activated by an electrical system that also pumps and heats the water.

[0005] For example, machines that use American coffee capsules operate through a handle that opens an extraction module comprising a recipient into which the capsule is slotted after its insertion into the machine and a sealing lid that ruptures or opens the capsule and introduces the hot water. In this case, when the capsule is inserted into the machine, it is immediately opened on both the top and bottom (inflow and outflow). There is no high or accumulated pressure, only the normal dynamic pressure of the pumped water, as the actual capsule does not trap it, instead serving merely as a channeling element where the water runs through the coffee contained therein. Finaly, the capsule is not usually ejected automatically by repeating the opening movement with the handle but is instead removed manually after use by the users themselves.

[0006] At the state of the art, there are several types of capsules in countless shapes and materials (paper, plastic, metal and aluminum), which is why they have different compositions that influence their edible product preservation performance. In addition to increasing capsule production costs, the use of assorted types of materials to make capsules gives rise to waste product collection, separation, and selection problems, particularly when capsules are collected for recycling, which is why they are sometimes or even more frequently discarded in regular garbage bins. Many capsules currently in use are not recyclable or are hard to recycle. At the moment, aluminum ranks as the best capsule production material, as it ensures more efficient maintenance of edible product properties, with the added advantage of being “infinitely recyclable”, as it is quickly channeled back into the next production cycle, and also a fairly light material. Nevertheless, aluminum capsules still have a major downside for the afore-mentioned systems, when users must remove capsules manually after the coffee is brewed, because of the temperature reached by the capsule holder. As aluminum is an excellent heat conductor, this makes it hard to handle, with even a risk of burns.

[0007] The coffee capsules currently available have accustomed consumers to drinking coffee in a quick, hygienic, and high-quality manner; however, the material that constitutes the capsule: plastic or metal, combined with the organic matter of the coffee inside makes the recycling process very complex and difficult to carry out. One of the main concerns of coffee brands nowadays is the development and presentation of solutions that reduce the ecological footprint caused by capsule consumption.

[0008] There are coffee capsules on the market that are extremely hard to recycle, due to the use of two materials together: plastic and aluminum, as well as the way in which the lid and cup are welded together, making it practically impossible to access the organic matter they contain. There are currently some solutions at the state of the art that are pursuing a more eco-responsible and sustainable approach, using recyclable materials and limiting the amount of material used to fabricate the capsules.

[0009] Another current hurdle with capsules containing edible products lies in the fact their mechanical performance imposes heavy demands on coffee machines, as opening them requires the rupture of a plastic “door” on one of the cylinder ends through the application of a force which, over continued use, damages the sealing behavior required of the machine extraction groups.

[0010] DocumentPT 109815Bdiscloses a capsule with a configuration that optimizes the positioning and piercing of the capsule through its circular lid construction element, which is adapted to provide an inflow entrance passageway to the inside of the construction element in a recipient-type shape. The passageway presents an area with weaker material that is adapted in a manner whereby it ruptures under a certain outflow pressure. It also mentions the existence of a projection element that exercises mechanical lever-type force on the area with the weakened material. In this case, the circular lid construction element that is pierced is made from plastic material.

[0011] In turn, documentPT 107043Bpresents a capsule that comprises a part of the lid which may have at least one easy-rupture formation for water to flow in. The lid has at least one easy-rupture formation for the infusion water to flow into the recipient. The recipient, the lid, the base, and the piercing element are made of plastic, while the protection element is an aluminum sheet. The capsule lid piercing is merely hydraulic, not mechanical.

[0012] Furthermore, documentPT 2139791discloses a single-use capsule holding an aromatic essence for producing an infusion that comprises a recipient with a cover and a perforated base covered externally with a protection element, and a piercing element on the inner side of the afore-mentioned protection element, which is activated by the fluid pressure built up in the capsule recipient, allowing the outflow of the infusion. The flat cover presents at least one groove to channel the infusion water into the recipient. It also mentions that the recipient, the cover, the base, and the piercing element are made of plastic, with only the protection element being an aluminum sheet. In this case, the cover piercing action is hydraulic.

[0013] The solutions disclosed at the state of the art are focused mainly optimizing capsules to obtain more efficient and precise opening by the machine, as incorrect opening may negatively influence the outcome of an ideal infusion and may also cause loose fragments of materials that contaminate the infusion, in addition to the unwanted outflow of edible product from the capsule.

[0014] Nevertheless, none of the described solutions at the state of the art address the issue of mechanical capsule performances that are very hard on coffee machines, with the ongoing use thereof downgrading the seal behavior required from the machine extraction groups.

[0015] On the one hand, the more recent and rising use of capsules made from wood pulp-based material, generically called paper capsules, which are made from paper pulp, has been introducing new problems associated with their piercing by the machine in order to introduce water under pressure for the resulting infusion and distribution of the beverage.

[0016] Compliant with the physical and mechanical nature of the material used to produce capsules from paper pulp, the behavior of this material when pierced by the machine proves to be different from that noted for plastic or aluminum capsules.

[0017] Indeed, the wood pulp-based material used for paper capsules tends to be pushed by the piercing elements of the mechanical piercing group of the machine, but is often not actually perforated, which hampers the normal operation of the beverage preparation and distribution system.

[0018] Consequently, if on the one hand paper pods can lighten the load applied to the mechanical piercing groups, on the other they introduce a functional problem resulting from the absence of piercing, which is not noted with the more conventional plastic or aluminum capsules, particularly for systems and machines distributing edible products that use piercing elements applied to outflows (of edible products) from capsules.

[0019] Thus, there still exists in the state of the art a need for improved capsules for edible product machines and made from wood pulp-based material, that are pierced in the edible product outflow area, with characteristics that allow correct and effective ruptures and water flows, with the subsequent extraction of edible product under optimum and organoleptically adequate conditions.Summary of the Invention

[0020] This invention refers to capsule (1) made from wood pulp-based material for an edible product, the capsule (1) comprising a closed recipient (2) with an inner cavity (24) containing a single serving of an edible product, and with the recipient (2) demarcated by a side wall (21), a bottom wall (22), and a top wall (23), wherein the bottom wall (22) comprises an inner side (31), facing the inner cavity (24) of the recipient (2); wherein said bottom wall (22) comprises a blind-grooved element (4) arranged on its inner side (31), wherein the blind-grooved element (4) comprises a first blind groove (41) and a second blind groove (42) arranged within the first blind groove (41).

[0021] In a preferred embodiment, a first blind groove (41) has a depth (411) that is less than the depth (421) of the second blind groove (42).

[0022] In another embodiment, the blind-grooved element (4) is arranged in a closed circumferential layout on the inner side (31) of the bottom wall (22).

[0023] In yet another embodiment, said side wall (21), the bottom wall (22), and the top wall (23) of the capsule (1) define an inner side (7) of the recipient (2), with the inner side (7) of the recipient being partially or totally coated with a microfilm (5), whereby, in a preferred embodiment, the microfilm (5) is selected from the group comprised of polylactic acid (PLA), polyhydroxybutyrate (PHB) and polyhydroxybutyrate-co-polyhydroxyhexanoate (PHBHx).

[0024] In a much-preferred embodiment, the wood pulp-based material of the capsule (1) is paper pulp.

[0025] The invention also refers to a production process of a capsule (1) made from wood pulp-based material, with the process comprising the step of shaping a first blind groove (41) on the inner side (31) of the bottom wall (22) of the capsule (1) and shaping a second blind groove (42) inside said first blind groove (41).

[0026] In a preferred embodiment, the afore-mentioned process comprises shaping the first blind groove (41) with a depth (411) that is less than the depth (421) of the second blind groove (42).

[0027] The capsule (1) of the invention is intended for use in the preparation of American coffee, tea, or other edible products.

[0028] Presented below is a detailed description of the invention, referenced to the appended drawings, wherein:Fig.1

[0029] schematically shows a partial cross-section view of an embodiment of the capsule (1) of the invention, as well as a corresponding expanded view (A) of a detail of the bottom wall (22) fitted with a blind-grooved element (4) on its inner side (31).Fig.2

[0030] schematically shows a partial cross-section view of an alternative embodiment of the capsule (1) described in, wherein the inner side of its bottom wall (22) is coated with a microfilm (5).Fig.3

[0031] shows a separate view of the expanded detail of the capsule described in, in which the bottom wall (22) is visible, fitted with a blind-grooved element on its inner side, with the respective depths (411, 421) of its first and second grooves being equally visible, as well as the presence of a piercing element (6) of an edible products machine, before piercing action has been triggered.Fig.4

[0032] shows an expanded view of the capsule described in, after the piercing action has occurred.Fig.5

[0033] presents a schematic cross-section view of the inside of the capsule of the invention (without edible product) and an expanded detail of the bottom wall area (22) where a blind-grooved element (4) is clearly visible, arranged on the inner side (31) of the bottom wall (22) and the respective first and second grooves (41, 42).Fig.6

[0034] presents the capsule described inafter being perforated by the piercing elements (6) of an edible products machine.Fig.7

[0035] schematically presents a ground plan view of a preferred embodiment of the capsule (1) of the invention with a circularly closed blind-grooved element (4), arranged on the inner side of the bottom wall with the edible product outflow.

[0036] This invention refers to capsules made from wood pulp-based material, single-use, for the preparation of edible products, such as American coffee, tea, or similar products. The invention also refers to the production process of the afore-mentioned capsules.

[0037] Capsules containing edible products, such as coffee capsules, have the advantage of allowing the consumer to take the edible beverage in a quick, hygienic manner and with high organoleptic quality. However, the materials, plastic or aluminium, which constitute the more conventional capsules, combined with the organic matter of the edible product inside, make their recycling process very complex and difficult to carry out. In this way, the art has developed efforts in the development of alternative solutions that reduce the ecological footprint caused by the consumption of capsules. In this sense, the present invention is also directed to capsules constituted by more sustainable materials.

[0038] Thus, the capsule (1) of the invention is produced from compostable wood pulp-based material, more specifically from wood pulp, for example paper pulp, which may be optionally laminated with a biopolymer microfilm. Once used, these materials can be placed in either the regular or organic garbage. The most common wood pulp materials that can be used in the capsule (1) addressed by this invention are selected from the group comprising paper, card, cardboard, and blends thereof.

[0039] The invention will be described below, referenced to the appended Figures, which present merely illustrative and exemplificatory embodiments of the capsule of the invention.

[0040] The capsule (1) of the invention is designed for use in edible product machines, such as American coffee, drip coffee, tea, or other options, wherein the opening of the capsule is handled through the direct action of piercing elements in the afore-mentioned machines, on the bottom wall (22) of the capsule (1), with this bottom wall (22) typically located on one of the ends of the capsule (1) recipient (2).

[0041] In other words, and in practice, regardless of the described positioning of the capsule (1), the user can simply insert the capsule into a compatible beverages machine in a single appropriate position, which is pre-planned in the design of the machine and the compatible capsules, whereby the bottom wall (22) of the capsule (1) is located in an appropriate position for the respective piercing action by the machine.

[0042] The purpose of the present invention consists of providing a single-use capsule made from wood pulp-based material, with an enhanced design, for machines offering American coffee, drip coffee, tea, or other options, which is adaptable to any compatible machine on the market, and configured in a manner whereby its opening is the outcome of a first piercing action by the machine on its bottom wall (22), ensuring effective penetration of the machine’s piercing elements (6) into the inner cavity (24) of the capsule recipient (2).

[0043] With reference to, in an embodiment of the invention, there is a microfilm (5) on the bottom wall (22), which must also be ruptured to allow the piercing elements (6) of the machine to reach the inner cavity (24) of the capsule recipient (2) thus ensuring the feasibility of extracting the edible product.

[0044] With reference to Figures 1 and 3, the present invention provides a capsule (1) made from wood pulp-based material for an edible product, the capsule (1) comprising a closed recipient (2) with an inner cavity (24) containing a single serving (not shown) of an edible product, and with the recipient (2) demarcated by a side wall (21), a bottom wall (22), and a top wall (23), wherein the bottom wall (22) comprises:

[0045] an inner side (31) facing the inner cavity (24) of the recipient (2),

[0046] an outer side (32) facing said inner side (31) and

[0047] a thickness (3), defined by the distance between the inner side (31) and the outer side (32);

[0048] and wherein said bottom wall (22) also comprises a blind-grooved element (4) arranged on its inner side (31), wherein the blind-grooved element (4) comprises a first blind groove (41) and a second blind groove (42) arranged within the first blind groove (41), with the depth (411) of the first blind groove (41) less than the depth (421) of the second blind groove (42).

[0049] In the context of this description, the term “comprising” shall be understood as meaning “including, among others”. Consequently, this term shall not be interpreted as “comprising only”.

[0050] Within the scope of the present invention, the terms “top wall” and “bottom wall” shall be understood as the walls closing off the side wall at each end (top and bottom) and referring respectively to the inflow and outflow of water for the edible product. These two walls and the side wall thus define an inner cavity of the recipient, which is necessary for the recipient to contain an individual serving of an edible product.

[0051] Within the scope of the present invention, “groove” is understood to mean a channel cut into the thickness of the bottom wall, carrying the edible product outflow from a capsule.

[0052] Within the scope of the present invention, “grooved element” is understood to mean a groove element carved into the wood pulp-based material forming the bottom wall of a capsule, with such grooved element combining two grooves, wherein a second groove is contained or arranged within a first groove; and in a preferred embodiment, the second groove is deeper or penetrates more (relative to the thickness of the material where it is located) than said first groove.

[0053] In the context of the expression “blind groove” or “blind-grooved element”, the term “blind” mean that said groove or grooved element penetrates only partially into the thickness of the material forming the bottom wall of the capsule; in other words, it does not correspond to an opening or rip allowing throughflow that cuts through the entire thickness of the afore-mentioned material. A person versed in the art will know how to cut a groove or a grooved element, with the characteristics listed in this description, on the inner side of a bottom wall with the edible product outflow from a capsule, with no need for additional information.

[0054] It is noted that any X value presented in this description shall be interpreted as an approximate value for the actual X value, as such as approximation of the real value would be reasonably expected by a person versed in the art, due to experimental and / or measurement conditions that introduce deviations in the real value. For example, the reference to “0.7” thus indicates a value of “about 0.7”.

[0055] With reference to Figures 1 and 2, said side wall (21), bottom wall (22), and top wall (23) of the capsule of the present invention define an inner side (7) of the recipient (2). In an embodiment illustrated in, the inner side (7) of the recipient (2) is coated with a microfilm (5).

[0056] The inner side (7) of the recipient (2) may be fully or partially coated by a microfilm (5).

[0057] The purpose of the afore-mentioned microfilm (5) is to create barrier between the edible product contained in the capsule (1) and the air outside in the surrounding environment, allowing the edible product to be conserved, maintaining its quality and validity for more than 12 months.

[0058] The microfilm (5) comprises a biopolymer film whose thickness lies within a range of 1-200 µm. The biopolymer may be selected from the group comprising polylactic acid (PLA), polyhydroxybutyrate (PHB) and polyhydroxybutyrate-co-polyhydroxyhexanoate (PHBHx).

[0059] In an embodiment of the present invention, the junction between the side wall (21) and the bottom wall (22) is joined by slotting and then welded by heat or ultrasound.

[0060] In either case, a person versed in the art may use any other method for joining the side wall (21) to the bottom wall (22).

[0061] As the capsule (1) of the present invention is made from a wood pulp-based material that forms its structural body, and as the interior of this structure is laminated with a biopolymer microfilm (5), it ensures that the edible product has no contact whatsoever with the air / atmosphere outside the capsule, which constitutes an improvement for the organoleptic conditions of the edible product, compared to capsules that do not offer this isolation, as the wood pulp-based material is essentially a porous material.

[0062] However, it should be noted that the presence or absence of the afore-mentioned microfilm (5) does not affect other functional aspects of the capsule, in particular its perforation by the piercing elements (6) of an edible products machine.

[0063] On the other hand, the wood pulp-based material of the capsule (1) offers little resistance to mechanical deformation, due to its nature and its physical and chemical constitution, which is not desirable for use in edible product systems (machines) whose operations are based on piercing (rupturing) a capsule wall through the insertion of the piercing elements (6) of the machine. Indeed, it is noted in many cases that the capsule (1) material is deformed but not ruptured by the action of the piercing elements (6) which, for piercing in the outflow area, blocks the feasibility of the subsequent outflow of water into the inner cavity (24) of the capsule recipient, thus hampering the function of distributing the edible product to the user.

[0064] It was thus possible to solve the afore-mentioned piercing problem on the bottom wall (22) of the capsule (1), by opening or, in other words, providing a blind-grooved element (4) on the inner side (31) of the bottom wall (22). The blind-grooved element (4) is comprised of a first blind groove (41) and a second blind groove (42), with the second blind groove (42) contained within the first blind groove (41) and with the depth (411) of the first blind groove (41) being less that the depth (421) of the second blind groove (42), as shown in Figures 1, 2 and 3.

[0065] Successful tests were run on several capsules with different width and depth ratios between the first blind groove (41) and the second blind groove (42), leading to the conclusion that the decisive factor is the existence of a blind-grooved element (4), wherein the second blind groove (42) is contained within the first blind groove (41), in other words, the second groove (42) is located within the radial space of the first groove (41), being necessarily narrower than the first groove (41), and with the second groove (42) being deeper than the first groove (41), in other words, the second groove (42) ends in a position closer to the outer side (32) of the bottom wall (22) than the first groove (41), as clearly shown in Figures 1 and 3, for example.

[0066] As described above, said blind-grooved element (4) configuration provides a tension distribution that allows and facilitates the penetration of the piercing elements of the machine into the wood pulp-based material of the capsule, in an efficient embodiment.

[0067] With regard to, in a preferred embodiment of the capsule of the invention, the blind-grooved element (4) is arranged, as a single element, in a closed circle layout on the inner side of the bottom wall (22).

[0068] Different numerical ratios between the widths of the first and second blind grooves (41, 42), as well as the ratios between the depths to which they penetrate the bottom wall (22) material, have no decisive effects on the piercing action, which was successfully achieved in tests covering a broad range of size ratios.

[0069] Normally, the thickness adopted at the state of the art for the fabrication of capsule recipients (2) made from wood pulp-based material lies between 0.6 mm and 0.8 mm, most frequently being 0.7 mm. Although different depth (411, 421 respectively) ratios were tested for the grooves (41, 42), from the production standpoint it was noted that capsules with a thickness of 0.7 mm, a first groove depth (411) of 0.4 mm, and a second groove depth (421) of 0.6 mm ensured good piercing performances by the machine. These values are merely indicative and are not exclusionary for a good performance; however, it was found that a depth (421) greater than the afore-mentioned 0.6 mm is hard to achieve without running the risk of perforating the entire thickness (3) of the bottom wall (22), which is undesirable. Moreover, for practical implementation reasons and the functional threshold range, differences of less than 0.1 mm are not desirable between the depth (411) and the depth (421) of the grooves forming the blind-grooved element (4).

[0070] For practical implementation reasons, the width of the grooves (41, 42) in the grooved element (4) may range from 1 mm to 2 mm for the first groove (41) and 0.5 mm to 1 mm for the second groove (42), in a preferred manner. However, other values may be used for the width in the afore-mentioned grooves (41, 42) without adversely affecting the proposed functional purpose, provided that such implementations are consistent with the space available on the bottom wall and the implementation capsule production process / system for the afore-mentioned grooves.

[0071] It was thus noted that the new layout of the bottom wall (22) fitted with a blind-grooved element (4) can ensure an optimized outflow of edible product, together with a functionally correct edible product extraction performance from capsules made from wood pulp-based material, while simultaneously ensuring that the mechanical piercing action penetrates the capsule without requiring a mechanical opening performance that imposes heavy demands on coffee machines.

[0072] Tests demonstrated that this invention is also fully functional for capsules made from plastic or aluminum materials, with the underlying problem (piercing difficulty) in such cases becoming less tricky, at least with the thicknesses commonly used in the current plastic and aluminum capsule fabrication process. Nevertheless, it is expected that the application of the blind-grooved elements of the invention will lead to an across-the-board reduction in the thicknesses adopted for plastic and aluminum capsule production processes, which might constitute an improvement in economic terms, as well as better resource management and lighter ecological footprints.

[0073] In turn, using the afore-mentioned ecological materials (wood pulp), which are more sustainable and fully compostable, eases the current negative impacts of plastics and aluminums on consumers and the environment.

[0074] The geometry and weight of the capsule (1) of the invention are compatible with the operation of edible product filling lines.

[0075] The invention also encompasses a capsule production process (1) using a wood pulp-based material, with this process comprising a step of shaping, on the inner side (31) of the bottom wall (22) of the capsule (1), a first blind groove (41) and shaping a second blind groove (42) inside said first blind groove. In this process, the step of shaping the first blind groove (41) uses a depth (411) that is less than the depth (421) of the second blind groove (42).Examples

[0076] Tests were conducted with multiple depth (411) and width (421) and ratios between the first groove (41) and the second groove (42). This led to the conclusion that these ratios do not significantly affect the main purpose of achieving the successful piercing of the capsule (1) by the edible products machine, provided that the afore-mentioned grooves are configured as a blind-grooved element (4), as explained above.

[0077] During the single weak point tests (only one groove or channel) in the material of the capsule to be pierced by the edible products machine, several flawed or incomplete perforations were noted, or even the absence of piercing by the machine, thus resulting in the faulty operation of the machine-capsule system.

[0078] 1- Capsule made from wood pulp-based material;

[0079] 2- Recipient;

[0080] 3- Thickness of the bottom wall with the edible product outflow;

[0081] 4- Blind-grooved element;

[0082] 5- Microfilm;

[0083] 6- Piercing element of edible products machine;

[0084] 7- Inner side of the recipient;

[0085] 21- Side wall;

[0086] 22- Bottom wall with the edible product outflow;

[0087] 23- Top wall water inflow;

[0088] 24- Inside of the recipient;

[0089] 31 Inner side of the bottom wall with the edible product outflow;

[0090] 32- Outer side of the base with the edible product outflow;

[0091] 41- First blind groove;

[0092] 42- Second blind groove;

[0093] 411 - Depth of the first groove;

[0094] 421 - Depth of the second groove;

[0095] It is noted that, although the description of this invention mentions a plurality of embodiments, modifications may be made and other alternatives adopted by a person versed in the art, without stepping beyond the range encompassed by this invention, which is defined by the claims

Claims

A capsule (1) made from wood pulp-based material for an edible product, the capsule (1) comprising a closed recipient (2) with an inner cavity (24) containing a single serving of an edible product, and with the recipient (2) demarcated by a side wall (21), a bottom wall (22), and a top wall (23), wherein the bottom wall (22) comprises an inner side (31) facing the inner cavity (24) of the recipient (2), characterized in that said bottom wall (22) comprises a blind-grooved element (4) arranged on its inner side (31), wherein the blind-grooved element (4) comprises a first blind groove (41) and a second blind groove (42) arranged within the first blind groove (41).Capsule (1) made from wood pulp-based material according to claim 1, characterized in that the first blind groove (41) has a depth (411) that is less than the depth (421) of the second blind groove (42).Capsule (1) made from wood pulp-based material according to claim 1, characterized in that the blind-grooved element (4) is arranged in a closed circumferential layout on the inner side (31) of the bottom wall (22).Capsule (1) made from wood pulp-based material, according to any one of claims 1 to 3, characterized in that said side wall (21), a bottom wall (22), and the top wall (23) define an inner side (7) of the recipient (2), with the inner side (7) of the recipient being partially or fully coated with a microfilm (5).Capsule (1) made from wood pulp-based material, according to claim 3, characterized in that the microfilm (5) is selected from the group comprised of polylactic acid (PLA), polyhydroxybutyrate (PHB) and polyhydroxybutyrate-co-polyhydroxyhexanoate (PHBHx).Capsule (1) made from wood pulp-based material, according to any one of claims 1 to 5, characterized in that the wood pulp-based material is paper pulp.Production process of a capsule (1) made from wood pulp-based material as claimed in any of Claims 1 to 6, characterized in that it comprises a step of shaping, on the inner side (31) of the bottom wall (22) of the capsule (1), a first blind groove (41) and shaping a second blind groove (42) inside said first blind groove (41).Production process of a capsule (1) according to claim 7, characterized in that it shapes the first blind groove (41) with a depth (411) that is less than the depth (421) of the second blind groove (42).Use of the capsule (1) as claimed in any one of claims 1 to 6, characterized in that it is for the preparation of American coffee, tea, or other edible products.

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