A compostable lid having an oxygen barrier layer for sealing a capsule, and a capsule sealed with the lid

Abstract

A compostable lid having an oxygen barrier layer for sealing a capsule, and a capsule sealed with the lid are provided. [Solution] A compostable lid for sealing capsules containing coffee, etc., which is made up of a multi-layer product having at least a nonwoven fabric containing at least 50% by weight of biodegradable fibers, a support made of vegetable parchment, and at least one oxygen barrier layer. [Selected Figure] Figure 1

Description

Technical Field

[0001] The present invention relates to a lid having an oxygen barrier layer for sealing capsules such as coffee capsules. The capsule sealed with the lid is also a subject of the present invention. Finally, the present invention relates to the use of the lid for sealing capsules containing foods such as coffee powder.

[0002] In the following description, the present invention will be described with respect to coffee capsules. However, the present invention is expected to enclose foods with a lid, and the lid must be a water-resistant, pressure-resistant, tear-resistant oxygen barrier, and advantageously applicable to all fields such that it can be heat-sealed to a food container such as a capsule.

Background Art

[0003] Currently, two types of coffee pods are supplied on the market. · A flexible pod essentially composed of a non-woven bag containing coffee. · A rigid pod or capsule composed of a capsule tightly sealed with a lid.

[0004] Specifically, the present invention relates to capsules.

[0005] In the European market, Nespresso(R)-type capsules are widely known. The substantial capsule part and cover of these capsules are essentially made of aluminum. There are also capsules in which the cover is manufactured from a plastic material.

[0006] However, there is a strong desire to convert these non-compostable capsules into compostable capsules.

[0007] Regarding the substantially capsule part, although there are few, some solutions have been proposed. That is, capsules made of polylactic acid (PLA) plastics or so-called "PLA-compatible" plastic materials have been developed. The so-called "PLA-compatible" materials correspond to a mixture of PLA and vegetable fibers. These materials are biodegradable and compostable. Therefore, these capsules meet the condition of being compostable imposed by the EN13432 standard.

[0008] On the other hand, there are many restrictions for the cover or lid, so it is even more difficult to obtain a compostable lid. In fact, the above-mentioned capsules are expected to be used in a coffee machine within a pressure and temperature range that requires mechanical resistance.

[0009] Essentially, the capsule is used in the following process in a coffee machine using individual pods or capsules. When the capsule is placed in a predetermined position, an impact is applied to the bottom of the capsule. Due to the formed hole, water heated up to 96°C can be introduced into the body of the capsule at a pressure of 10 - 12 bar. The water filling the capsule gradually applies pressure to the lid, and the lid comes into contact with the pin-type piercing element arranged in the machine. The pressure during lid piercing and extraction is mostly 5 - 15 bar, although it also depends on the particle size of the coffee. When the lid is pierced in the form of a pin, the coffee flows into the cup. The manufacturer imposes certain conditions on the flow of the coffee. For example, no powder should enter the cup. Also, a pod of about 30 ml should flow in about 30 seconds. Furthermore, the flowing liquid should have a color and density similar to that of foam. Even after the coffee has flowed, there are some restrictions while the capsule is not yet removed. In fact, assuming that the user does not remove the capsule until several hours after the coffee has flowed (i.e., until the temperature of the capsule has returned to room temperature), the capsule should not deform. Otherwise, when inserting a new capsule, it will not fall into the receptacle prepared for this purpose. Also, the lid should not peel off.

[0010] In other words, it must be a compostable lid that is resistant to humidity and pressure so as not to be torn either before or during puncturing. It is also necessary to provide a lid that does not allow powder to pass through when coffee flows.

[0011] Patent Document 1 describes a multilayer article for mold manufacturing that combines a non-woven fabric based on a biodegradable polymer, an adhesive layer suitable for contact with food, and a cellulose fiber-based support. The mold obtained in this way exhibits the property of being resistant to moisture derived from food so that the edge of the mold does not collapse even when food is placed in the mold. Naturally, since it is not a parameter to be considered in this application, pressure conditions are not mentioned.

[0012] Patent Document 2 in the name of the present applicant describes a compostable lid for sealing a capsule containing coffee or the like, which is made from a multilayer article that combines a non-woven fabric based on polylactic acid fibers and a support made of a vegetable parchment.

Prior Art Documents

Patent Documents

[0013]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0014] Accordingly, the problem that the present invention proposes to solve is a compostable lid for sealing capsules such as capsules containing coffee, and the conditions for using this type of lid in a coffee machine such as a coffee machine using individual pods or capsules, for example, resistance to humidity, resistance to a pressure of about 5 to 15 bar applied by a mixture of powder and water during lid perforation and extraction, no peeling, satisfying the filterability such that coffee does not pass into the cup during extraction, and how to devise a lid that is an oxygen barrier.

[0015] Another problem that the present invention proposes to solve is to devise a lid that can be incorporated into the current capsule manufacturing line without significantly changing the line.

Means for Solving the Problems

[0016] For this reason, the applicant has advantageously devised a compostable article combining a non-woven fabric based on PLA fibers, an oxygen barrier layer, and a vegetable parchment support. The lid thus obtained has resistance to the required pressure of 5 to 15 bar and humidity, and is an oxygen barrier that can be easily incorporated into existing capsule manufacturing lines.

[0017] Also, the non-woven fabric can prevent powder from passing through the lid when coffee flows into the cup, and the oxygen barrier can suppress oxygen from permeating into the coffee before the capsule is used.

[0018] More specifically, the subject of the present invention is a compostable lid for sealing capsules containing coffee or the like, a non-woven fabric in which at least 50% by weight of the contained fibers are biodegradable fibers, a support composed of a vegetable parchment, at least one oxygen barrier layer and is a lid composed of a multi-layer article having at least.

[0019] In the following description and claims, "compostable lid" means a lid that meets the EN13432 standard because it contains a maximum total ratio of 5% by weight of organic components whose biodegradability is not measured (e.g., those derived from binders or fibers that are not compostable).

[0020] Similarly, "compostable capsule or capsule body" means a capsule or capsule body that meets the EN13432 standard because it contains a maximum total ratio of 5% by weight of organic components whose biodegradability is not measured (e.g., those derived from binders or fibers that are not compostable).

[0021] As used herein, the term "biodegradable fiber" refers to the decomposition of fibers into organic substances by living organisms such as microorganisms. Examples of biodegradable fibers include polyhydroxyalkanoates (PHA) such as polylactic acid or polylactide (PLA) fibers, copolymers of PLA and PHA other than PLA; biodegradable polyethylene (PE); biodegradable polypropylene (PP); biodegradable polybutane (PB); starch-based polymers; cellulose-based polymers; ethylene vinyl alcohol (EVOH) polymers; and fibers made of other biodegradable polymers such as polybutanediol succinate (PBS), among others.

[0022] In a preferred embodiment, the nonwoven fabric containing the biodegradable fibers described herein meets the compostability standard and biodegradability standard of EN13432.

[0023] It is advantageous that at least 40% by weight of the above biodegradable fibers are heat-sealable fibers, preferably polylactic acid (PLA) fibers.

[0024] In the following description and claims, the expression "heat-sealable fiber" means a biodegradable fiber that can reliably seal a nonwoven fabric onto a capsule by heating. As such fibers, PLA fibers that can heat-seal a nonwoven fabric onto a compatible PLA capsule are advantageous.

[0025] Within the framework of the present invention, when the oxygen transmission rate through the lid is measured according to ASTM D3985 standard and ASTM F1927 standard, it is 1.5 cm 3 / m 2 / day or less, the lid is considered to be sufficient with respect to oxygen barrier properties.

[0026] Similarly, if the lid is not torn when subjected to a pressure of 5 - 15 bar applied by the mixture of powder and water during the perforation and extraction of the lid, the lid is considered to be sufficient with respect to pressure resistance. Before perforation, the lid should not be torn by the influence of the increasing water pressure in the capsule. After perforation, the holes due to perforation should not be torn and enlarged under the influence of pressure so as not to leak the powder and to maintain the foam characteristics of coffee, etc.

[0027] There are several types of coffee capsules, some are currently under development, and some will be developed in the future. The lid according to the present invention has the advantage that it can be easily adapted to all types of capsules, whether known or not yet appeared.

[0028] For example, the frustum-shaped semi-rigid capsules described in U.S. Patent No. 7,658,141 and U.S. Patent No. 7,153,530 can be mentioned. Also, U.S. Patent No. 8,956,672 that discloses an inverted cup-shaped capsule can be mentioned. European Patent No. 2,690,035 discloses a frustum-shaped capsule with its bottom perforated. European Patent No. 2,648,579 describes, as part of it, a frustum-shaped capsule, and the smallest bottom of this frustum is concave when viewed from the outside. Also, European Patent No. 1,344,722 and U.S. Patent No. 7,543,527 that disclose capsules including a dispensing disk, etc. can be mentioned. European Patent Application Publication No. 1,659,909 (A1) that describes a capsule having an integrated injection nozzle can be mentioned. Also, reference can be made to the capsules described in U.S. Patent No. 8,361,527, European Patent No. 1,529,739, and U.S. Patent No. 5,325,765.

[0029] According to the first feature, the lid of the present invention has a non-woven fabric in which at least 50% by weight of the contained fibers are biodegradable fibers.

[0030] The biodegradable fibers are preferably selected from the group consisting of cellulose fibers such as cotton, linen, and wood fibers, PLA (polylactic acid), PHA (polyhydroxyalkanoate), PHB (polyhydroxybutyrate), PHB(V) (poly(hydroxybutyrate-co-hydroxyvalerate)), PBS (polybutylene succinate), and biopolyester fibers.

[0031] Polylactic acid (PLA) has advantages such as being of biological origin, biodegradable, and compostable. "PLA" means polylactic acid, its derivatives (L- and D-forms or copolymers), and mixtures thereof. PLA fibers advantageously have a diameter of 10 to 15 μm.

[0032] Advantageously, at least 40% by weight of the biodegradable fibers are heat-sealable fibers.

[0033] The heat-sealable fibers are preferably selected from the group consisting of PLA, PHA (polyhydroxyalkanoate), PHB (polyhydroxybutyrate), PHB(V) (poly(hydroxybutyrate-co-hydroxyvalerate)), PBS (polybutylene succinate), and biopolyester.

[0034] The heat-sealable fibers preferably have a melting point of at least 100°C, for example, 100 to 250°C, preferably 100 to 200°C.

[0035] Generally, a non-woven fabric is a material obtained by randomly arranging and intertwining individual fibers. The cohesive force between the fibers can be ensured by adding adhesives or binders (such as latex, polyvinyl alcohol, starch, etc.), heating, pressing, or needling. Numerous methods for manufacturing non-woven fabrics form part of the knowledge of those skilled in the art. For example, the meltblown spinning method, the direct spinning or spinlace or spunbond method, the carding method, the air-laying method, or the wet-laying method can be mentioned.

[0036] In addition to fibers, the non-woven fabric may further contain additives and inorganic fillers. By blending additives, fillers, or fibers other than PLA, the melting point of the PLA base layer can be adjusted.

[0037] In practice, at least 20% by weight, preferably at least 50% by weight, advantageously at least 85% by weight, more preferably at least 90% by weight of the fibers constituting the non-woven fabric are PLA fibers, and biodegradable fibers, advantageously cellulose fibers, are added up to 100% to form the non-woven fabric. In addition to PLA fibers, the non-woven fabric may contain other biodegradable fibers, preferably cellulose fibers. In a preferred embodiment, the non-woven fabric is formed of fibers selected only from biodegradable fibers. Advantageously, the non-woven fabric is manufactured by the wet-laying method in this embodiment.

[0038] In a specific embodiment, 100% of the fibers of the non-woven fabric are composed of heat-sealable fibers, advantageously PLA fibers. In this case, the cohesive force of the fibers, and thus the cohesive force of the non-woven fabric, can be obtained without using adhesives or binders by the spunbond manufacturing method.

[0039] When containing 100% by weight of PLA, the non-woven fabric may be single-layered. It is advantageous to be a double-layer non-woven fabric. The double layer may contain a single component, i.e., only one type of PLA, or alternatively two components, i.e., two types of PLA with different melting points.

[0040] According to another feature, the air permeability of the non-woven fabric measured according to the DIN53.887 standard is 3000 to 5000 L / m 2 / second.

[0041] Finally, in practical terms, the basis weight of the non-woven fabric is 5 to 100 g / m 2 , preferably 10 to 30 g / m 2 , more preferably 15 to 20 g / m 2 , preferably about 18 g / m 2 .

[0042] According to an essential feature of the present invention, the support is made of a vegetable parchment recognized as "veritable" in France. A detailed description of this can be found in the following document: Mayer, Ferdinand F (May 1860), "Technical Intelligence-Vegetable Parchment-Papyrene", The American Journal of Science and Arts, XXIX (LXXXVI): 278. Essentially, vegetable parchment is usually paper treated with sulfuric acid. Although less common, zinc chloride may also be used. The fibers are cellulose fibers, usually selected from eucalyptus fibers and resin-based fibers. In practical terms, sulfuric acid dissolves the cellulose around the fibers. A cellulose gel is formed and precipitates. In the final step, the support is washed. The applied treatment forms a vulcanized cross-linked sheet with high density, stability, and heat resistance, and sufficient non-stickiness due to low surface energy.

[0043] Therefore, the support is neither high-density greaseproof paper nor chemically treated (e.g., fluororesin-treated) greaseproof paper. The support does not contain resin, so it imparts mechanical strength when wet.

[0044] To improve the pressure resistance, the ratio of the wet bursting strength measured according to the ISO3689 / 1994 standard to the dry bursting strength measured according to the ISO2758:2001 standard of the vegetable parchment is 50 to 70%, preferably 55 to 65%.

[0045] In practice, the basis weight of the vegetable parchment is 30 to 120 g / m 2 , preferably 70 to 110 g / m 2 .

[0046] Similarly, its thickness is, in practice, 60 to 130 μm.

[0047] According to another essential feature, the lid has at least one oxygen barrier layer. The oxygen barrier allows, for example, the coffee contained in the capsule to be kept for a longer period.

[0048] According to the first embodiment, the oxygen barrier layer is arranged between the non-woven fabric and the support. Thus, the lid has, in the direction of the capsule, successively the support, the oxygen barrier layer, and the non-woven fabric.

[0049] According to the second embodiment, the non-woven fabric is arranged under the support and the oxygen barrier layer is arranged above the support. Thus, the lid has, in the direction of the capsule, successively the oxygen barrier layer, the support, and the non-woven fabric. Each barrier layer itself may consist of a plurality of layers.

[0050] According to the third embodiment, the lid according to the invention has two oxygen barrier layers.

[0051] In a first particular case, the two barrier layers are arranged side by side, preferably between the non-woven fabric and the support.

[0052] Thus, the lid has, in the direction of the capsule, successively the support, the two oxygen barrier layers, and the non-woven fabric.

[0053] In a second particular case, the two barrier layers are separated and arranged on both sides of the support. Thus, the lid has, in the direction of the capsule, successively the oxygen barrier layer, the support, another oxygen barrier layer, and the non-woven fabric.

[0054] According to another feature, each oxygen barrier layer may have a different composition.

[0055] In practice, the oxygen barrier layer is based on polyvinyl alcohol (PVA).

[0056] In the first embodiment, the barrier layer comprises a mixture of polyvinyl alcohol and a polyamide epichlorohydrin resin. The polyamide epichlorohydrin resin is preferably Kymene. In this case, the oxygen barrier layer is composed of 80 to 95% by dry weight, preferably 85 to 90% by weight, of PVA, with the polyamide epichlorohydrin resin added to make up to 100%.

[0057] In the second embodiment, the oxygen barrier layer is based on polyvinyl alcohol with a degree of hydrolysis of 98 to 99%. As described above, the barrier layer may further contain a polyamide epichlorohydrin resin in the same proportion as above.

[0058] In the third embodiment, the oxygen barrier layer is based on highly amorphous polyvinyl alcohol. As an example, Michem(R) Flex Barrier 3510 manufactured by MICHELMAN can be mentioned.

[0059] In the fourth embodiment, the barrier layer is based on an ethylene vinyl alcohol copolymer (EVOH).

[0060] In practice, the total basis weight of the oxygen barrier layer (i.e., when consisting of one or two or more layers) is 0.5 g / m 2 ~8 g / m 2 and advantageously 2 to 5 g / m 2 .

[0061] In practice, the oxygen barrier layer is applied to the support by coating. When the support is treated with two barrier layers, the two different layers are coated continuously.

[0062] It is advantageous for the lid to further have at least one adhesive layer, preferably an adhesive layer suitable for contact with food.

[0063] According to the above embodiment, the adhesive layer is applied between the oxygen barrier layer and the nonwoven fabric, or between the support and the nonwoven fabric.

[0064] The adhesive can ensure the cohesive force of the multi-layer product exposed to a temperature close to or higher than the melting point of PLA, for example, when heat-sealing the lid to the capsule. Also, when the multi-layer product is in contact with hot water during extraction and subsequent cooling, the adhesive can hold the vulcanized support or, if applicable, the vulcanized support article / oxygen barrier layer on the PLA layer welded to the capsule.

[0065] The term "adhesive suitable for contact with food" means any type of adhesive commonly used in the agro-food industry. However, it is advantageous to be selected from the group consisting of acrylic adhesives, polyurethane adhesives, ethylene vinyl acetate, and mixtures thereof.

[0066] In a preferred embodiment, the adhesive suitable for contact with food is selected from acrylic adhesives commercially available as Carbobond(R) and Hycar(R) series from Lubrizol and is used alone or as a mixture.

[0067] In practice, the amount of the adhesive is 1 to 5 g / m 2 in terms of dry weight based on the surface of the multi-layer product, preferably 2 to 4 g / m 2 and preferably about 3 g / m 2 corresponds to.

[0068] The oxygen barrier layer and the adhesive are applied such that the multi-layer product contains a maximum of 5 wt% in total ratio of organic components whose biodegradability is not measured, thereby meeting the EN13432 standard.

[0069] Advantageously, the thickness of the multi-layer product which is the subject of the present invention is 60 to 150, preferably 90 to 110 μm.

[0070] According to another feature, the lid of the present invention may be perforated.

[0071] The subject of the present invention is also a capsule containing coffee or the like, and the capsule has a substantial capsule, also referred to as a "capsule body", containing coffee powder sealed with a lid as described above. Preferably, the lid is arranged such that the non-woven fabric faces the edge of the capsule.

[0072] In practice, the capsule contains 5 to 20 g of coffee powder. The thickness of the coffee layer is 10 to 40 mm, and the diameter of the capsule is 2.5 to 6 cm.

[0073] In a preferred embodiment, the capsule body is made of PLA or a PLA-compatible material. In this case, as long as it is a compatible (PLA or PLA-compatible) material, there is an advantage that the lid can be joined to the capsule body by sealing, heat sealing, adhesion, etc.

[0074] It is advantageous that the capsule and / or the capsule body can be composted according to the above EN13432 standard.

[0075] All the details of the test standard and the requirements for meeting the standard are described in NF EN13432:2000-11 "Requirements for packaging recoverable through composting and biodegradation" (incorporated herein by reference).

[0076] According to the above standard, it is also preferable that the compostable lid and / or the compostable capsule of the present invention decompose in a biological waste treatment process until no more than 10% of the original dry weight of the test material can pass through a fraction sieve of >2 mm, as defined in EN13432.

[0077] In a preferred embodiment, it is advantageous that the compostable lid is itself compostable according to the above EN13432 standard.

[0078] The capsule having a capsule body and a lid is preferably used in a coffee machine using individual capsules or pods.

[0079] The present invention also relates to the use of the above-described lid for sealing capsules such as coffee capsules, wherein the lid is arranged such that the non-woven fabric faces the edge of the capsule.

[0080] The present invention and the advantages derived therefrom will become more apparent from the following examples and drawings shown for the purpose of explaining the present invention. It should be noted that these examples and drawings do not limit the present invention.

Brief Description of the Drawings

[0081]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0082] <Example of the Structure According to the Present Invention> Figure 1 shows · a support (1) made of a vegetable parchment, · an oxygen barrier layer (2), · a non-woven fabric (3) in which 100% by weight of the contained fibers is composed of PLA in the form of a multi-layer product having them continuously.

[0083] The lid of Figure 2 is · an oxygen barrier layer (2), · a support (1), · a non-woven fabric (3) in the form of a multi-layer product having them continuously.

[0084] The lid of Figure 3 is · an oxygen barrier layer (2), · a support (1), ·Another oxygen barrier layer (2), ·A non-woven fabric (3), are continuously provided in the form of a multi-layer product.

[0085] The lid of Figure 4 is ·A support (1), ·An oxygen barrier layer (2), ·Another oxygen barrier layer (2), ·A non-woven fabric (3), are continuously provided in the form of a multi-layer product.

[0086] <Examples of the lid according to the present invention> Examples 1 to 7 show some configurations of the lid according to the present invention.

[0087] In all examples, the non-woven fabric is a double layer formed only of PLA fibers. This is a single-component double layer with a basis weight of 18 g / m 2 .

[0088] Similarly, in all examples, the non-woven fabric is separated from the layer above it, i.e., the oxygen barrier (Figure 1, 3 or 4) or the support, by an adhesive layer (not shown) applied at a rate of up to 3 g / m 2 by dry weight. The adhesive is selected from acrylic adhesives commercially available as Carbobond(R) and Hycar(R) series from Lubrizol and is used alone or as a mixture.

[0089] The support (1) is a vegetable parchment with a basis weight of 70 g / m 2 or 110 g / m 2 commercially available under the name "Sulflex(R)" by the applicant.

[0090] Three types of oxygen barrier layers are tested. ·100% by weight of a primary aqueous layer (commercially available under the name Michem(R)Flex Barrier 3510 from MICHELMAN) containing ultra-amorphous PVA (HAVOH) at a rate of 2 g / m 2 by dry weight · 90 wt% PVA and 10 wt% polyamide epichlorohydrin resin (Kymene(R)) by dry weight. This layer is applied at a rate of 2.5 g / m 2 in terms of dry weight. · 90 wt% partially hydrolyzed PVA (Exceval(R)) and 10 wt% polyamide epichlorohydrin resin (Kymene(R)) by dry weight. This layer is applied at a rate of 2.5 g / m 2 in terms of dry weight.

[0091] For Examples 1 - 7, the oxygen barrier layer and the adhesive layer are applied such that the total ratio of organic components with non - measurable biodegradability is at most 5 wt%.

[0092] The oxygen transmission rate was measured according to ASTM D3895 standard and ASTM F1927 standard at atmospheric pressure (1.013 bar), temperature 23 °C, and relative humidity 50%. The results obtained in Examples 1 - 7 are summarized in the following table. All examples with an oxygen barrier layer have an oxygen transmission rate of less than 1.5 cm 3 / m 2 / day, showing sufficient oxygen barrier performance.

[0093]

Table 1

[0094] In the case where there is no oxygen barrier layer, the above - mentioned sample had a very high oxygen transmission rate and was insufficient.

[0095] Next, the pressure resistance of the lid is confirmed. For this purpose, the capsule is placed in a Nespresso(R) Pixie machine and the pressure increase during the entire extraction time is tracked. The pressure is 5 - 15 bar depending on the particle size of the coffee contained in the capsule. None of the tested lids were torn under the influence of pressure.

Claims

1. A compostable lid for sealing a capsule containing coffee powder, which is used in a coffee machine for extracting coffee under pressure conditions of 5 to 15 bar, a non-woven fabric in which at least 50% by weight of the fibers contained are biodegradable fibers, a support composed of a vegetable parchment in which the ratio of the wet bursting strength measured according to ISO 3689 / 1994 to the dry bursting strength measured according to ISO 2758:2001 is 50 to 70%, at least one oxygen barrier layer and is composed of a multi-layer product having at least The total basis weight of the oxygen barrier layer (when there are multiple oxygen barrier layers, the total weight of the multiple oxygen barrier layers) is 0.5 g / m ２ to 8 g / m ２ and the lid has an oxygen migration rate of less than 1.5 cm ３ / m ２ / day.

2. The lid according to claim 1, characterized in that at least 40% by weight of the biodegradable fibers are heat-sealable fibers.

3. The biodegradable fibers are selected from the group consisting of cellulose fibers such as cotton, linen, and wood fibers, PLA, PHA (polyhydroxyalkanoate), PHB (polyhydroxybutyrate), PHB(V) (poly(hydroxybutyrate-co-hydroxyvalerate)), PBS (polybutylene succinate), and biodegradable polyester fibers. The lid according to claim 1 or 2, characterized in that it is

4. The heat-sealable fibers are selected from the group consisting of PLA, PHA (polyhydroxyalkanoate), PHB (polyhydroxybutyrate), PHB(V) (poly(hydroxybutyrate-co-hydroxyvalerate)), PBS (polybutylene succinate), and biodegradable polyester. The lid according to any one of claims 1 to 3, characterized in that it is

5. At least 50% by weight, preferably at least 85% by weight, more preferably at least 90% by weight of the fibers constituting the non-woven fabric are PLA fibers, and biodegradable fibers are added until it reaches 100%, and the lid according to any one of claims 1 to 4 is characterized in that it is configured.

6. The lid according to any one of claims 1 to 4, characterized in that 100% by weight of the fibers constituting the non-woven fabric are PLA fibers.

7. The basis weight of the above-mentioned vegetable parchment is 30 to 120 g / m ２ Preferably 70 to 110 g / m ２ The lid according to any one of claims 1 to 6, characterized in that it is.

8. The lid according to any one of claims 1 to 7, characterized in that the oxygen barrier layer is disposed between the non-woven fabric and the support.

9. The lid according to any one of claims 1 to 8, characterized in that the non-woven fabric is disposed under the support, and the oxygen barrier layer is disposed on the support.

10. The lid according to any one of claims 1 to 9, characterized in that it has two oxygen barrier layers.

11. The lid according to claim 10, characterized in that the two oxygen barrier layers are arranged side by side between the non-woven fabric and the support.

12. The lid according to claim 10, characterized in that the two oxygen barrier layers are separated and disposed on both sides of the support.

13. The lid according to any one of claims 1 to 12, characterized in that the oxygen barrier layer is based on polyvinyl alcohol or contains a mixture of polyvinyl alcohol and a polyamide epichlorohydrin resin.

14. The total basis weight of the oxygen barrier layer is 2 to 5 g / m ２The lid according to any one of claims 1 to 13, characterized by being such.

15. The lid according to any one of claims 1 to 14, further comprising an adhesive layer applied between the oxygen barrier layer and the non-woven fabric.

16. The lid according to any one of claims 1 to 15, characterized in that the pressure resistance is 5 to 15 bar.

17. A coffee powder capsule having a capsule body sealed with the lid according to any one of claims 1 to 16, wherein the lid is arranged such that the non-woven fabric faces the edge of the capsule body.

18. The capsule according to claim 17, characterized by containing 5 to 20 g of coffee powder, the thickness of the coffee layer being 10 to 40 mm, and the diameter being 2.5 to 6 cm.

19. Use of the lid according to any one of claims 1 to 16 for sealing a capsule, wherein the lid is arranged such that the non-woven fabric faces the edge of the capsule body.

Images