FR3035085A1 - BIODEGRADABLE CAPSULE AND METHOD FOR MANUFACTURING THE SAME - Google Patents

Abstract

The invention relates to a capsule (1) comprising: - a hollow body (2) able to receive an ingredient, said body (2) having a closed side wall (4), at a first end (6), by a bottom ( 3), and bordered, at a second end (5), by a flange (14), - a cover (7) attached to said flange (14) for closing said second end (5) of the side wall (4), characterized in that said operculum (7) is composed of at least one paper membrane (8) covered with at least 5 g / m2 of a resin layer (9) which comprises one or more rupture primers (10) , so that said resin layer (9) is positioned between said paper membrane (8) and said body (2), said lid (7) being able to withstand a water pressure of at least 8 bar.

Description

TECHNICAL FIELD TO WHICH THE INVENTION RELATES The present invention relates generally to the field of the preparation for drinking under water pressure. It relates more particularly to a capsule comprising a substance, such as ground coffee or tea, intended to be extracted under water pressure; said capsule being advantageously biodegradable. It also relates to a method of manufacturing the aforementioned capsule, as well as its use to prepare drinks.

BACKGROUND The use of capsules to prepare beverages under the effect of a pressure of water injected into a device for making beverage, such as an espresso machine, is described in particular in document EP0242556. . This document describes in particular an apparatus comprising a capsule-holder and extraction means for receiving the capsule. Such a capsule comprises a hollow body containing for example a bed of ground coffee, which is closed at one end by a bottom and at a second end by a cap. The extraction means comprises in particular at least one tip capable of piercing the bottom of the capsule and to allow the entry of hot water under pressure ranging from 2 to 20 bar. The rise in pressure causes the capsule to swell and the water to mix with the coffee bed until the lid breaks, thus releasing the liquid. Once the drink has been prepared, the capsule is extracted into the capsule-holder. The beverage preparation from capsule as described above has many advantages. By way of example, the use of espresso-type coffee capsules allows ease of use, optimal preservation of the coffee, a better control of the quality of the coffee obtained, or even a good reproducibility of the extraction conditions, while meeting the highest standards of hygiene. In particular, the substance contained in the capsule is immune to external influences. Several types of capsules have been developed in the state of the art to perfect these benefits. There are first of all capsules whose lid is made of filter paper such as the subject of patent EP272432. However, with this type of lid 3045085 2, the water passes too quickly on the coffee bed, without large pressure rise, which leads to a coffee without presence of residual foam in good quantity. There are also capsules whose lid is made of plastic / aluminum or aluminum. The document FR 2 373 999 describes in particular a capsule comprising: a sealed body, for example of aluminum, having the general shape of a truncated cone with a border at the base, and a lid closing this base. The seal comprises in particular a plastic filter, such as a 40 to 60 μm polypropylene screen with an orifice and an aluminum membrane having a sagging line, or even radial grooves, so that it can be break more easily after the pressure rise phase. However, such a capsule is difficult to recycle because of the lid made of polypropylene (non-biodegradable plastic) and aluminum. The separation of the two compounds is indeed not easy. The document EPO 309 708 describes a capsule identical to that of the document FR 2 373 999 except that the filter of the lid is preferably composed of aluminum covered with a heat-sealable lacquer. The capsule described in this document has the advantage of withstanding a pressure of up to 15 bar, thus enabling a rapid rise in pressure within the capsule during the phase of bringing the coffee into contact with water. In particular, the aluminum seal has a sufficiently high mechanical strength to withstand a pressure to extract the coffee and thus obtain an espresso, aerated and unctuous, while allowing the flow of coffee through the subsidence line arranged on the membrane of the lid. However, the use of such an aluminum capsule, although potentially recyclable is, in fact, only rarely recycled by the consumer and thus has a poor record on the ecological level. To overcome this ecological problem, a solution developed in the state of the art is to provide fully biodegradable capsules, such as those described in WO 2011/015973. This document describes a capsule comprising a lid made of a membrane made of a material based on cellulose derivatives (Naturflex® NE30 marketed by Innovia Films) covered with a cotton thread frame. The membrane and the weft can be made integral with one another by using a resin, or by welding or by gluing. However, such a capsule does not tear and therefore does not allow the making of a coffee with a residual foam in good quantity and good quality. There is thus a need in the state of the art to provide a new capsule for the preparation of drink under water pressure and in particular, a smooth drink at a pressure ranging from 13 to 20 bars and which is advantageously biodegradable.

The object of the present invention is thus to propose a novel capsule which avoids, at least in part, the aforementioned disadvantages. OBJECT OF THE INVENTION In order to overcome the above-mentioned disadvantage of the state of the art, the present invention proposes a capsule, preferably a biodegradable capsule, comprising: a hollow body capable of receiving an ingredient, said body comprising a wall; side closed, at a first end, by a bottom, and bordered at a second end by a flange; An operculum attached to said rim, preferably said outer rim, for closing said second end of the side wall, characterized in that said operculum is composed of at least one paper membrane covered with at least 5 g / m 2 a resin layer which comprises one or more rupture primers, so that said resin layer (9) is positioned between said paper membrane (8) and said body (2), said lid being able to withstand a pressure of water of at least 8 bar, preferably 13 bar, in particular ranging from 13 to 20 bar and typically from 14 to 18 bar. By virtue of its characteristics, the capsule according to the invention thus has the advantage of withstanding pressures of around 8 to 15 bars allowing a rapid rise in pressure and obtaining an aerated and unctuous espresso drink when the ingredient contained in the hollow body is in particular ground coffee or powdered chocolate. In addition, thanks to the presence of the breaker or primers, the seal is able to tear / crack in a defined time, thus making the process of reproducible use of capsule in capsule. In addition, the capsule is advantageously composed of biodegradable materials as will be described below. Other nonlimiting and advantageous features of the capsule 5 according to the invention, taken individually or in any technically possible combination, are the following: said paper membrane is coated with at least 10 g / m 2, preferably 12 to 25 g / m 2 and typically 15 to 20 g / m 2 of said resin layer; Said one or more rupture primers of said resin layer comprise one or more zones of reduced thickness or one or more through openings, or one of their combinations; the resin layer is made of agro-polymers, polyesters or a mixture thereof; The agro-polymers are chosen from: polysaccharides (such as starches of potato, corn, wheat or rice), proteins (such as casein, collagen, gelatin, gluten), or a mixture thereof; the polyesters are chosen from: poly (butylene adipate-co-terephthalate) (PBAT), poly (butylene succinate-co-adipate) (PBSA), poly (butylene succinate-co-lactide) (BPSL), poly (butylene succinate-co-terephthalate) (PBST), poly (butylene succinate) (PBS), polymers derived from lactic acid (PLA), polycaprolactones (PCL), polyesteramines (PEA), polyglycolide (PGA), poly (methylene adipate-co- terephthalate) (PTMAT), vinyl alcohol polymer, polyhydroxyalkanoate (PHA) or a mixture thereof; The paper membrane is of kraft paper, filter paper, nonwoven, biopolymer, cotton, or a combination thereof; said body is biodegradable; said capsule is adapted to allow the percolation of said ingredient; Said body contains ground coffee, powdered chocolate, tea, powdered soup, or an infusion. The invention also proposes a method of manufacturing a capsule as described above, comprising the following steps: (a) the manufacture of said body of said capsule; (B) manufacturing said seal of said capsule; (c) closing said lid on the rim of said body so that said resin layer of said lid is positioned between said paper membrane and said body.

The present invention also relates to the use of a capsule as described above for preparing a drink under water pressure. DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT The following description with reference to the accompanying drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be achieved. In the accompanying drawings: - Figure 1 is a schematic representation of a capsule according to one embodiment of the present invention; Figure 2 is another schematic representation of the capsule according to Figure 1; - Figure 3 is a partial section of an extraction means for receiving a capsule according to Figure 1 and to thereby allow the extraction of the substance contained in said capsule.

Referring to Figures 1 and 2, a capsule 1 according to the invention will be described. This capsule 1 is particularly suitable for being inserted into a coffee-making apparatus, such as that disclosed, for example, in document E P0242556 described above or in document E P0468078. As mentioned above, the capsule 1 comprises a hollow body 2, 25 intended to contain an ingredient for the preparation of drink under water pressure, such as roast and ground coffee, which is closed by a lid 7. The body hollow 2 comprises in particular a side wall 4 from which extends, at a first end 6, a bottom 3 and, at a second end 5, an outer circular rim 14. The wall 4 has in particular the general shape of an acute cone frustum, whose conicity with respect to an axial axis is generally from 2 to 20 °, preferably from 10 ° to 1 (ie 20 ° of angle at the apex). By truncated cone, one understands as well frustoconical in the strict sense, that trunk of ellipsoid, trunk of sphere or even cylindrical. This wall 4 is closed at its smallest end, namely at the end 6, by the bottom 3. This bottom 3035085 6 generally has the shape of an obtuse cone. Alternatively, the bottom 3 may be flat or may be domed. In general, the bottom 3 is able to be perforated and comprises in particular a recess 11 having a cavity 12. The obtuse-shaped portion of the bottom 3 may be weakened in order to facilitate the piercing by an injection member of the medium. extraction of the beverage making apparatus and thereby facilitate the introduction of pressurized water into the capsule 1. For example, the recess 11 and the cavity 12 may cooperate with a rod of the injection member for centering and holding the capsule firmly in place while one or more points of this injection member 10 will pierce the obtuse cone or the bottom 3 may be pierced by the injection member at the recess 11. The body 2 generally has a thickness of 30 to 500 μm, preferably 80 to 400 μm and is preferably semi-rigid. It advantageously comprises one or more biodegradable materials. Preferably, the body 2 is made entirely of biodegradable materials. According to the invention, the body may be made of a material essentially based on agroresources, which are the plants which provide the basic compounds necessary for energy, chemistry and materials, in particular: lipids and proteins obtained from rapeseed, sunflower, soybean, flax, ..., carbohydrates obtained from cereal and sugar beet crops, lignocellulosic fibers from crop residues, such as straw, annual crops such as hemp and sorghum, and silviculture, as well as specific molecules from co-products of various plants, these 25 agro-resources being or not transformed, the transformation may lead to materials, such as polylactic acid (PLA), poly hydroxy butyrate (PHB) ), polyhydroxyalkanoate (PHA), biodegradable polyesters, etc. By way of example, the body 2 may be made from at least: starch, proteins, cellulose, hemicellulose, lignin, lipids, sugars or polylactic acid (PLA) or a mixture thereof. According to an alternative embodiment, the body 2 is made from a composition comprising in mass relative to its total mass (dry matter): 20% and 60% of starch, 3% and 20% of proteins, 15% and 60% cellulose, hemicellulose and lignin, 1% and 15% lipids and 0.01% and 3035085% sugar. According to another alternative embodiment, the body 2 is made from a composition comprising, by weight, relative to its total mass (dry matter): from 30 to 90% of PLA and from 10 to 70% of starch .

The circular flange 14 is formed when the body 2 is made by thermoplastic injection into a mold having the appropriate shape as will be described hereinafter. It may have a width ranging from 1 to 4 mm. The flange 14 has the main function of abutting against a border of a capsule-holder of the beverage making apparatus during the extraction phase 10 of the coffee and thus allow the firm holding of the capsule during the climb in pressure. The lid 7 has a size calibrated so as to come to conform to the contour of the flange 14 of the body 2 of the capsule 1 thus closing said body 2. The ingredient, here coffee, is thus trapped in the hollow body 2. In general, the cover 7 will be glued or heat-welded to the flange 14 of the body 2 of the capsule 1. In particular, this cover 7 comprises a paper membrane 8 covered with at least 5 g / m 2 of a layer of resin 9. This resin layer 9 according to the invention is disposed between the body 2 and the paper membrane 8.

According to the invention, the paper membrane 8 is advantageously strong enough so as not to yield / tear during the extraction phase of the coffee and thus retain the coffee grounds. It can, however, deform under the pressure of water. The paper membrane 8 may be, for example, made from kraft paper, filter paper, or nonwovens, biopolymer, cotton, or a combination thereof. It preferably has a basis weight ranging from 20 to 180 g / m 2, preferably ranging from 40 to 80 g / m 2, typically a grammage of the order of 60 g / m 2. Preferably, the paper membrane 8 also has a thickness preferably ranging from 80 to 600 μm, in particular from 100 to 400 μm.

It also has a certain porosity: the pore size may range, for example, from 1 to 60 μm, advantageously from 2 to 30 μm, and preferably has a passage area of 2 to 8% of its total surface area. Generally, the membrane 8 has a bursting resistance ranging for example from 0.2 to 3 kg / cm 2.

By way of example, the kraft paper marketed by the company LEIPA under the reference VKP80 is suitable as a paper membrane according to the present invention. The resin layer 9 which covers the paper membrane 8 serves in particular to reinforce said membrane 8. This is why it is applied to it at a rate of at least 5 g / m 2, preferably at least 10 g / m 2. g / m 2, in particular from 12 to 25 g / m 2 and typically from 15 to 20 g / m 2. Within the meaning of the invention, at least 5 g / m 2 includes the following values: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, etc.

It has a thickness generally ranging from 5 μm to 30 μm, typically from 10 μm to 20 μm. The resin layer 9 according to the invention is advantageously biodegradable and suitable for heat-bonding, thermo-welding the paper membrane 8 to the body 2. It may be for example in agro-polymer (s), polyester (s) or a of their mixtures. By way of example, the one or more agro-polymers may be chosen from: polysaccharides (such as starches of potato, corn, wheat or rice), proteins (such as casein, collagen, gelatin, gluten), or a mixture thereof.

The polyester or polyesters suitable for producing the resin layer 9 may be generally chosen from: poly (butylene adipate-co-terephthalate) (PBAT), poly (butylene succinate-co-adipate) (PBSA), poly (butylene succinate) colactide) (BPSL), poly (butylene succinate-co-terephthalate) (PBST), poly (butylene succinate) (PBS), polymers derived from lactic acid (PLA), polycaprolactones (PCL), polyesteramines (PEA), polyglycolide ( PGA), poly (methylene adipate-co-terephthalate) (PTMAT), polyvinyl alcohol, polyhydroxyalkanoate (PHA) or a mixture thereof. The resin layer 9 according to the invention comprises one or more failure primers. Indeed, without these fracture primers, the Applicant has discovered that the resin layer does not yield under the water pressure during the extraction phase of the coffee in the beverage making apparatus. The one or more breakthroughs of said resin layer that is suitable for the invention comprise in particular one or more zones of reduced thickness or one or more through openings, or one of their combinations.

According to an alternative embodiment, the one or more rupture primers can thus be one or more zones of reduced thickness. Within the meaning of the invention, "one or more zones of reduced thickness" means that one or more zones of weakness have been formed in the thickness of the resin layer 9, but that they are not not through, unlike the "through openings" according to the invention. By way of example, one or more zones of reduced thickness may correspond to one or more cavities that can be obtained for example by mechanical crushing, such as embossing, or to lacerations, or else radial edges that can be obtained. by shearing. For example, 4 radial edges or an embossing of 5 to 10 cavities per cm 2 make it possible to obtain rupture primers according to the invention. According to another embodiment, the one or more rupture primers can thus be one or more through openings. According to the invention, this or these through openings may correspond to orifices, slots or a combination thereof. By "orifices" is meant a hole passing through the layer from one side to the other which can be obtained for example by perforation; while "slot" means an opening which also passes through the resin layer from one side to the other but which has a length greater than its width.

The orifices and slots may be arranged in line with the resin layer 9 or at an angle. According to this variant embodiment, the resin layer may comprise from 20 to 40, preferably from 25 to 30 through openings per cm 2. Generally, the openings 10 will be orifices. In this case, the orifices are uniformly distributed over the surface of the resin layer and may have, for example, a mean diameter ranging from 0.05 to 0.15 mm, preferably ranging from 0.08 to 0.12 mm. In general, the orifices are spaced from 2 to 18 mm, preferably from 4 to 10 mm. The holes may be straight or have the shape of a truncated cone, truncated pyramid or tetrahedron trunk.

The seal 7 thus defined has the advantage of being able to withstand a water pressure of at least 8 bar, advantageously at least 13 bar, in particular 13 to 20 bar and typically 14 to 18 bar. Within the meaning of the invention, a pressure of at least 8 bar includes the following values: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, etc.

A method of manufacturing the capsule according to the invention will now be described below. This process comprises in particular the following steps: (a) the manufacture of said body of said capsule; (B) manufacturing said seal of said capsule; (c) closing said lid on the rim of said body, so that the resin layer 9 is disposed between the paper membrane 8 and the body 2 of the capsule 1. Preferably, the step (a) is carried out by extrusion of one or more biodegradable thermoplastics, and then by thermoplastic injection into a hot runner mold. In general, the biodegradable thermoplastic material (s) forming the body 2 of the capsule 1, as well as the rim 14, are initially in the form of granules. These granules undergo an extrusion before being injected into the molds having the desired shape for the body 2 of the capsule 1, namely that of an acute cone frustum closed by an obtuse cone-shaped bottom and bordered to its shape. Another end by the border 14. This step is then followed by that of the manufacture of the lid (b) which is carried out by: coating of said resin layer on said paper membrane (at least 5 g / m 2 of layer resin); the formation of the rupture zone (s) by shearing, mechanical crushing, laceration, perforation or a combination of these techniques. Then, the body of the capsule is dosed in molded coffee and roasted. The dose of coffee contained may vary between 2 and 20 g, the thickness of the coffee bed may for example represent between 10 and 25 mm. Finally, the body 2 is closed by the cover 7 during step (c) which can be performed by gluing or heat-sealing. These techniques are known to those skilled in the art and will not be further detailed.

The operation of the capsule in a beverage making apparatus, such as a coffee machine, suitable for the present invention and having an extraction means 20 will now be briefly described below with reference to FIG. The extraction means 20 according to FIG. 3 comprises an upper portion 21 with thread 23 and a housing 24 adapted to receive a seal (not shown) to be screwed onto the water outlet of the machine. A lower portion 22, the extraction means 20 comprises an annular body 22 having a housing 29. Between the bore 25 and 5 the annular body 22 is disposed an injection member 27. L water thus arrives through the bore 25 on the injection member 27, here constituted of 3 points with adjournments 28. When it is desired to extract the coffee from the capsule 1, it is placed in the housing 29 of the means of Extraction 20. The spikes 27 will cut the f ond 3 of the capsule 1 at its weakening zone. The hot water will then arrive under a pressure of at least 10 bar via the adjournments 28 of the injection member 27 and will wet the bed of ground coffee and roasted (not shown). Due to the high pressure, there is no need for a seal at the injection member 27, the water will remain in the capsule 1. The annular body 22 of the extraction means 20 will cooperate with a capsule holder (not shown) to firmly hold the edge 14 of the capsule 1 against a stop on the capsule holder. Under the effect of the pressure of the water, the capsule 1 will deform at its lid 7 to its rupture tension, causing the opening of the lid 7 at the level of the rupture primers 10. According to an alternative embodiment, the capsule-holder may comprise a punch or a multitude of holes protruding facilitating the rupture of the rupture primers 10 of the resin layer 9 of the lid 7. In this case, the capsule 1 is perforated at its two ends, namely at the bottom 3 via the injection member 27 and at the level of the cap 7 via the projections and the holes present on the capsule-holder. During this phase, the paper membrane 8 will deform without, however, tearing so as to retain the coffee grounds. Once the operculum is pierced, the actual extraction can then begin. The liquid will flow through the openings 10 of the lid 7, 30 and then through the pores of the paper membrane 8 and will pass through the flow holes provided for this purpose within the coffee machine. At this point, the pressure increases in the capsule 1. The drink is collected in a container (not shown). We usually get to extract a capsule in less than a minute and we get a drink with all the characteristics of an espresso.

The present invention thus also relates to the use of a capsule as defined above, for preparing a drink under water pressure. EXAMPLES Comparative tests were carried out by the Applicant to test different pressure rises of coffee capsules having a different operculum in a nespresso machine marketed by KRUPS under the reference INISSIA. For these tests, capsule # 1 is a reference capsule sold by Nespresso® (ROMA). The capsules 2 to 3, 5 and 6 have the following composition: the body of these capsules is made of Vegemat® (biodegradable polymer from natural resources) marketed by Vegeplast and has a thickness of 0.6 mm. It has the shape of a calibrated truncated cone to fit into the capsule cage of the coffee machine. The capsule No. 4 provides a body also in the form of a conical frustum of plastic closed by an aluminum cap (marketed by the company Capsul-in). The capsule No. 5 according to the invention comprises in particular a lid made from an 80 g / m2 kraft paper marketed by MONDI under the reference "Sackkraft se brown" which has been coated with 30 g / m 2 of a biodegradable Sustainex® resin (PLA) with 25 perforations per cm2 uniformly on its surface (ref.192926-10). Comparative capsule No. 6 was made in the same manner as capsule 5 except that it has no break primers, namely the aforementioned perforations. Ex Type of seal Pressure Time Up in Max (bar) flow (s) pressure 1 Aluminum cap of the 17 22 fast Nespresso® brand 2 Filter paper (marketed 8 13 Progressive by Ahlstrom under 3035085 13 Table 1 The Table 1 above shows that the capsule according to the invention is able to withstand high pressures of up to 16 bar and thus has the same properties as the reference capsule 1. In addition, it allows to obtain an espresso, aerated and unctuous drink with a residual foam in good quantity, in which even the volatile aromas were recovered for a total extraction time of around twenty seconds. developed by the Applicant allows a good reproducibility of the extraction conditions, while being biodegradable Type of lid Max pressure (bar) Flow time (s) Pressure rise Ex the reference wccF 54 g) Kraft paper sold by MONDI under the reference Sackkraft se brown (80 g / cm 2) 3 10 10 Progressive Capsul-in marketed aluminum sealer (plastic body) 4 15 17 Rapid biodegradable Operate according to the invention with rupture primers.

16 21 Fast Biodegradable Opercule with no breakage primers impossible 6 0

Claims (15)

REVENDICATIONS1. Capsule (1) comprising: - a hollow body (2) capable of receiving an ingredient, said body (2) having a closed side wall (4), at one end (6), by a bottom (3), and lined , at a second end (5), by a rim (14), - a cover (7) attached to said flange (14) for closing said second end (5) of the side wall (4), characterized in that said operculum (7) is composed of at least one paper membrane (8) covered with at least 5 g / m2 of a resin layer (9) which comprises one or more rupture primers (10), so that said resin layer (9) is positioned between said paper membrane (8) and said body (2), said lid (7) being able to withstand a water pressure of at least 8 bar. The capsule (1) according to claim 1, wherein said paper membrane (8) is coated with at least 10 g / m 2, preferably 12 to 25 g / m 2 and typically 15 to 20 g / m 2 of said resin layer (9). The capsule (1) according to claim 1 or 2, wherein said one or more rupture primers (10) of said resin layer (9) comprise one or more zones of reduced thickness or one or more through openings, or a of their combinations. 4. Capsule (1) according to one of the preceding claims, wherein the resin layer (9) is in agro-polymers, polyesters or a mixture thereof. 5. Capsule (1) according to claim 4, wherein the agro-polymers are selected from: polysaccharides, proteins, or a mixture thereof. 6. Capsule (1) according to claim 4, wherein the polyesters are chosen from: poly (butylene adipate-co-terephthalate) (PBAT), poly (butylene succinate-co-adipate) (PBSA), poly (butylene succinate- co-lactide) (BPSL), poly (butylene succinate-co-terephthalate) (PBST), poly (butylene succinate) (PBS), polymers derived from lactic acid (PLA), polycaprolactones (PCL), polyesteramine (PEA), polyglycolide (PGA), poly (methylene adipate-coterephthalate) (PTMAT), polyvinyl alcohol, polyhydroxyalkanoate (PHA) or a mixture thereof. 3035085 15 7. Capsule (1) according to any one of the preceding claims, wherein the paper membrane (8) is kraft paper, filter paper, nonwoven, biopolymer, cotton, or a combination thereof. The capsule (1) according to any one of the preceding claims, wherein said body (2) is biodegradable. 9. Capsule (1) according to any one of the preceding claims, adapted to allow the percolation of said ingredient. The capsule (1) according to any one of the preceding claims, wherein said ingredient is ground coffee, powdered chocolate, tea, powdered soup, or infusion. 11. A method of manufacturing a capsule (1) according to one of claims 1 to 10, comprising the steps of: (a) the manufacture of said body (2) of said capsule (1); (b) producing said seal (7) of said capsule (1); (C) closing said seal (7) on the rim (14) of said body (2), so that said resin layer (9) of said seal (7) is positioned between said paper membrane (8) and said body (2). The manufacturing method according to claim 11, wherein step (a) is carried out by extruding one or more biodegradable thermoplastics and then thermoplastic injection into a hot runner mold. The manufacturing method according to claim 11 or claim 12, wherein step (b) is performed by: coating said resin layer (9) on said paper membrane (8); - The formation of the breaker or primers (10) by shearing, mechanical crushing, perforation or one of these techniques. 14. The manufacturing method according to one of claims 11 to 13, wherein step (c) is carried out by gluing or heat-sealing. 30 15. Use of a capsule according to one of claims 1 to 10, for preparing a drink by percolation under water pressure.