阅读说明：本技术 带脱气阀的胶囊 (Capsule with degassing valve ) 是由 O·波塞蒂 R·加尔巴西尼 G·古洛 A·麦克加南 F·戈利奥 于 2019-01-14 设计创作，主要内容包括：本发明涉及胶囊,其用于借助于加压提取流体从可溶的或可提取的产品制备液体产品的机器中。胶囊(1)包括：容器主体(2),容器主体(2)限定用于容纳借助于加压提取流体可溶的或可提取的产品的封闭腔室,所述流体通过机器的注入元件供应,所述容器主体具有第一基部(3)、第二基部(5)和在第一基部(3)和第二基部(5)之间沿着纵向(X-X)延伸的侧壁(4)；密封关联到所述容器主体(2)并且被设计成被打开以允许将所述加压流体引入所述腔室的注入盖(30)；密封地关联到所述容器主体(2)并且被设计成被打开以释放由所述产品和所述流体制备的饮料的饮料分配盖(50)。胶囊的特征在于包括脱气阀(6),脱气阀被配置为靠近所述容器主体(2),并且通过所述可溶的或可提取的产品释放的气体被致动成打开构造,并且通过所述加压流体被致动成闭合构造,所述脱气阀(6)通过形成在所述注入盖(30)中的至少一个切口(7)与所述封闭腔室(21)流体连通,所述加压流体仅在所述注入盖(30)打开之后才能进入所述封闭腔室(21)。(The present invention relates to capsules for use in machines for preparing liquid products from soluble or extractable products by means of a pressurized extraction fluid. The capsule (1) comprises: a container body (2), the container body (2) defining a closed chamber for containing a product soluble or extractable by means of a pressurized extraction fluid supplied by an injection element of a machine, the container body having a first base (3), a second base (5) and a lateral wall (4) extending along a longitudinal direction (X-X) between the first base (3) and the second base (5); an injection cap (30) sealingly associated to said container body (2) and designed to be opened to allow the introduction of said pressurized fluid into said chamber; a beverage dispensing cap (50) sealingly associated to said container body (2) and designed to be opened to release a beverage prepared from said product and said fluid. The capsule is characterized in that it comprises a degassing valve (6) arranged close to said container body (2) and actuated in an open configuration by gas released by said soluble or extractable product and in a closed configuration by said pressurized fluid, said degassing valve (6) being in fluid communication with said closed chamber (21) through at least one cut (7) formed in said injection cap (30), said pressurized fluid being able to enter said closed chamber (21) only after said injection cap (30) is opened.)

1. Capsule for use in a machine for preparing a fluid product from a soluble or extractable product by means of a pressurized extraction fluid, comprising:

-a container body (2) defining a closed chamber containing a product soluble or extractable by means of a pressurized extraction fluid supplied by an injection element of the machine, said container body having a first base (3) and a second base (5) and a lateral wall (4) extending along a longitudinal direction (X-X) between said first base (3) and said second base (5),

-an injection cap (30) sealingly associated to said container body (2) and designed to be opened to allow said pressurized fluid to enter said chamber;

-a beverage dispensing cap (50) sealingly associated to said container body (2) and designed to be opened to release a beverage prepared from said product and said fluid,

characterized in that it comprises a degassing valve (6), said degassing valve (6) being configured to be close to said container body (2) and to be actuated in an open configuration by gas released by said soluble or extractable product, and to be actuated in a closed configuration by said pressurized fluid, said degassing valve (6) being in fluid communication with said closed chamber (21) through at least one cut (7) formed in said infusion cap (30), said pressurized fluid being able to enter said closed chamber (21) only after said infusion cap (30) has been opened.

2. Capsule according to claim 1, characterized in that the degassing valve (6) is embedded in the thickness (S) of the first base and/or in the thickness (S) of the side wall of the container body (2).

3. Capsule according to claim 1 or 2, characterized in that the first base (3) comprises:

-an inner surface (300) facing the closed chamber (21), an outer surface (301) facing the outside of the capsule (1),

-a first opening (302) for the passage of the extraction fluid and a second opening (303) for the passage of the gas generated by the soluble or extractable product,

a first sealing area (304) and a second sealing area (305) for sealingly associating the injection cap (30) to an inner surface (300) of the first base (3),

-the first opening (302) of the base (3) is closed by the injection cap (30) through the first sealing area (304) and the second opening (303) is closed by the injection cap (30) through the second sealing area (305).

4. The capsule according to claim 3, wherein the first opening (302) comprises a plurality of holes arranged in a circular crown shape and the second opening (303) comprises a plurality of holes arranged along a straight line.

5. Capsule according to claim 4, characterized in that the first sealing area (304) and the second sealing area (305) are shaped like a circular crown, wherein the diameter of the first sealing area (304) is larger than the diameter of the circular crown representing the first opening (302) and the diameter of the second sealing area (305) is larger than the diameter of the circular crown representing the second opening (303) but smaller than the diameter of the circular crown representing the first opening (302).

6. Capsule according to any of claims 3 to 5, characterized in that said first base (3), when observed from the outside, comprises:

-a central portion (3010);

a ring-shaped portion (3011) surrounding the central portion, the ring-shaped portion (3011) being configured to be recessed with respect to the central portion (3010),

-the first opening (302) is provided at the ring-shaped portion (3011) and the second opening (303) is provided at the central portion (3010),

-said at least one cut (7) is provided in said central portion (3010).

7. A capsule (1) according to claim 3, wherein said first sealing area (304) and/or said second sealing area (305) is obtained by heat sealing or by ultrasound or by a bonding material.

8. A capsule (1) according to claim 7, wherein, in use, at least a portion of said first sealing area (304) and/or at least a portion of said second sealing area (305) yield to the pressure of the extraction fluid through said opening (302) such that said injection cap (30) is raised with respect to said lower base.

9. Capsule according to claim 1, characterized in that the degassing valve (6) comprises:

-a valve body (60) having the same thickness (S) as the first base (3);

-a membrane (62) movable between a first operative open position allowing passage of gas from the closed chamber (21) to the outside, and a second operative position preventing passage of gas and entry of extraction fluid into the closed chamber (21), the first operative position being allowed when a predetermined gas threshold is reached;

-a retaining member (63) for preventing loss of the movable membrane (62).

10. Capsule according to claims 3 and 9, characterized in that the retaining member (63) comprises:

-a cover (632) configured to mechanically engage with the outer surface (301) of the first base (3) to prevent the movable membrane (62) from being lost in the first open position and to protect the degassing valve (6) from substances external to the capsule (1).

11. Capsule according to claims 3 and 9, characterized in that the retaining member (63) comprises:

-a protective element (70) associated to the outer surface (301) facing the outside of the capsule (1) at the degassing valve (6), the protective element (70) being configured to prevent the movable membrane (62) from being lost and to protect the degassing valve (6) from the substances outside the capsule.

12. Capsule (1) according to claim 9, wherein said degassing valve (6) comprises a filter (40), said filter (40) being interposed between said injection cap (30) and said movable membrane (62) and being configured to avoid any leakage of product from said closed chamber (21) to the outside.

13. Capsule (1) according to claim 1, wherein said injection cap (30) is a material that is heat shrunk, torn, pierced or dissolved when said pressurized extraction fluid is supplied by said injection element of said machine.

14. The capsule (1) according to claim 1, wherein the second base (5) defines an annular edge (501), the dispensing cover (50) being associated to the annular edge (501) by means of a third sealing area (503).

15. Capsule (1) according to claim 1, wherein said injection cap (30) and said dispensing cap (50) are caps of the dissolvable barrier type, each of said injection cap (30) and said dispensing cap (50) comprising at least one first barrier layer (31, 51) and one oxygen barrier layer (32, 52).

16. Capsule (1) according to claim 1, wherein the container body (2) and/or the degassing valve (6) are made of a decomposable material.

17. A capsule (1) according to claim 1, wherein the degassing valve (6) is arranged in the vicinity of the first base (3), the second base (5) and/or the side wall (4), i.e. in the vicinity of the elements constituting the container body (2).

Technical Field

The present invention relates to a capsule with a degassing valve according to the preamble of claim 1.

In particular, the present invention relates to a capsule (also called cartridge or pod) for preparing a liquid product starting from a soluble product that can be extracted by means of a machine supplying a high-temperature extraction fluid (for example/or steam). The capsule is provided with a degassing valve adapted to degas the gases released by these soluble products during storage (i.e. before the capsule is used in the machine).

More particularly, the invention relates to a capsule provided with a degassing valve, the soluble product in which is fresh coffee.

Background

Dispensable capsules are known for use with suitable machines for preparing beverages.

Such capsules generally comprise a container body defining a closed chamber for containing a soluble or extractable product. The container body has a first base and a second base and a sidewall extending along a longitudinal direction X-X between the first base and the second base.

In particular, the second base and the first base are both closed by covers (also called films or sealing sheets), and one or both covers can be made of plastic material, aluminium, paper or a combination thereof, depending on the type of machine used.

For the extraction of the beverage, the lid or lids may be pierced by a machine piercing head, which in turn may also be configured to feed the extraction fluid into the closed chamber of the capsule.

Soluble or extractable products generally comprise an dehydrated substance for preparing the beverage, examples of which are ground coffee, instant coffee, a mixture of ground coffee and instant coffee or any other dehydrated edible substance.

It is also provided that the substance contained in the capsule can be a soluble, degassed product, such as fresh coffee or other food or non-food substance subjected to degassing.

However, it is well known that fresh coffee produces gases (such as CO)₂) The gas in the closed chamber of the capsule causes a pressure increase to break one or more lids of the capsule.

In this case, the capsule is no longer airtight and coffee degradation occurs.

This makes it impossible to use the capsule for preparing liquid products.

To overcome this problem, it is known to use a degassing valve to degas the gases formed inside the chamber and at the same time prevent any air from entering the closed chamber.

EP3085642 discloses a capsule provided with a degassing valve glued to the lid of the upper base.

In particular, EP3085642 teaches that a valve is adhered to the lid of the upper base so that gas can escape from the chamber through the valve and out of the capsule.

In the production of the beverage, the upper lid and the degassing valve are pierced by a piercing head which supplies the pressurized extraction fluid into the chamber.

Disclosure of Invention

Drawings

Figures 1A and 1B show a first embodiment of a capsule according to the invention in a perspective view from above and in a perspective view from below, respectively.

Figure 1C shows the capsule of figures 1A and 1B in a perspective view from below, but without the covering lid;

figure 1D shows a plan view of the capsule of figure 1A or 1B;

figure 2 shows a perspective view of a section along line II-II of the capsule of figure 1D;

figure 3 shows a side sectional view along line II-II of the capsule of figure 1D;

figure 4A shows an enlarged view of a portion of the capsule of figure 3 in a first operating state;

figure 4B shows an enlarged view of a portion of the capsule of figure 3 in a second operating state;

figure 5 shows an enlarged view of the same part of figure 3 of a second embodiment of the capsule according to the invention.

Detailed Description

Individual features described with reference to particular embodiments must be referred to as being auxiliary and/or interchangeable with other features described with reference to other embodiments, even if not explicitly stated.

In the following, the structure and advantages of the capsule 1 (or box or pod, the terms being used here equally) are explained, the capsule 1 preparing a soluble or extractable product by means of a pressurized extraction fluid supplied by a machine known in the art and therefore not further described.

In various embodiments, the liquid product in question may comprise a beverage obtained by introducing pressurized and heated (i.e. hot) liquid and/or steam into the cartridge, such as coffee.

In various embodiments, the capsule 1 may contain a soluble or extractable product of a substance (not shown in the figures) capable of forming a liquid product by means of the aforementioned liquid and/or vapour. Soluble or extractable products of such substances may include coffee powder or another precursor of a beverage-like liquid product (such as tea, chocolate powder or granules), preparation broths, soups, soft drinks and products of various infusions, this list being merely exemplary and not exhaustive.

In a preferred form of use, the soluble product contained in the capsule is a product that outgases during storage, i.e. a product that releases gas.

Even more preferably, the soluble product contained in the capsule is fresh coffee, in particular freshly ground coffee powder.

The figures show various views of a capsule 1, the capsule 1 comprising:

a container body 2 shaped like a small bowl or cup, defining a closed chamber 21 for containing a soluble or extractable product,

-a first base part 3 which is,

a second base 5, and

a side wall 4 extending along the longitudinal direction X-X between the first base 3 and the second base 5.

It should be noted that the container body 2 of the capsule 1 is preferably made of a decomposable or biodegradable material, wherein biodegradable refers to the ability to degrade organic substances and materials into simpler molecules by means of a series of irreversible chemical reactions. The certification of biodegradable materials includes levels of biodegradability to be achieved that degrade by at least 90% in a period of no more than 6 months.

Preferably, the container body 2 of the capsule 1 is made of biodegradable material selected from the group consisting of: this group comprises corn starch, potato starch, cellulose, biodegradable and decomposable plastics known under the trade name Mater-Bi and/or any combination of the above materials.

In particular, the container body 2 of the capsule 1 is preferably made of a decomposable material, for example based on polyester/PLA/resin derived from starch or the like.

In various embodiments, as shown in the figures, the body 2 may have a basin configuration that diverges from the first base 3 towards the second base 5.

In various embodiments, the diverging configuration may be a frustoconical configuration. In the latter example, preferably used for manufacturing the capsule 1, the term first base 3 refers to a base having a diameter smaller than the diameter of the second base of the capsule having the larger diameter.

However, this preferred embodiment is not essential, since the capsule 1 as a whole may have different shapes, such as prismatic, frustoconical, square, etc.

As shown in the figures, the capsule 1 comprises an injection cap 30 and a beverage dispensing cap 50, the injection cap 30 being designed to be opened to allow the extraction fluid to be supplied into the chamber, the beverage dispensing cap 50 being designed to be opened to release the beverage prepared from the soluble product and the fluid.

In the present description, the term lid refers to the closing element of the container body of the capsule, which is used to contain the soluble or extractable product inside the container body of the capsule and to prevent the liquid and solid foreign substances from entering inside the container body of the capsule.

According to a preferred aspect, both the infusion cap 30 and the beverage dispensing cap 50 are decomposable and oxygen-barrier type caps.

The term barrier cap refers to a closure element having physical and chemical resistance properties to, for example, oxygen or water or gas or fragrance or a combination of the foregoing.

The term decomposable barrier cover refers to a closure element that, in addition to the aforementioned features, also meets the decomposable capability requirements of the present specification.

Preferably, the injection cap 30 is closely associated with the first base 3, while the beverage dispensing cap 50 is closely associated with the second base 5.

The association of the covers 30, 50 with the respective bases is carried out by means of a sealing operation, as described below.

According to a preferred embodiment, there is provided:

an injection cap 30 comprising at least one barrier layer and an oxygen barrier layer, which in turn comprises a decomposable barrier film; the cover 30 has a predetermined thickness ranging from a minimum thickness to a maximum of 200 μm obtainable by this particular technique, exhibiting an elastic modulus ranging from 100 to 5000 MPa.

A dispensing cap 50 comprising at least a first barrier layer, in turn comprising a decomposable barrier film, and an oxygen barrier layer, and having a thickness of between 20 and 200 μm.

Embodiments of the lids 30 and 50 advantageously allow to obtain less than 10ccm at 23 ℃ at 0% Relative Humidity (RH)²An oxygen barrier value of/day atm.

With particular reference to figures 2 to 5, the capsule 1 comprises a degassing valve 6, the purpose of the degassing valve 6 being to vent the gases released by the product contained in the chamber 21 to the outside of the capsule 1.

In particular, the valve 6 is actuated in its open configuration by the gas released by the soluble or extractable product (fig. 4B) and in the closed configuration of the valve 6 by the pressurized fluid supplied by the machine (fig. 4A).

To this end, in order to make a capsule 1 capable of releasing the gas generated by the soluble product out of the capsule 1 and to make the capsule 1 usable with standard machines, it is advantageous that said valve 6 is arranged close to the container body 2 and is configured to be in fluid communication with the closed chamber 21 through at least one cut 7 formed in the injection cap 30, wherein the pressurized fluid supplied by the machine can only enter the closed chamber 21 after opening the injection cap 30.

This configuration of the valve 6 with respect to the container body 2 advantageously avoids wear of the piercing head of the machine, since the valve 6 is not configured on a cap designed to close the second base 5, and above all maintains the thickness of the caps 30 and 50 within values that do not require the use of modified machines to pierce thicker caps.

In other words, degassing valve 6 is arranged in the vicinity of first base 3, second base 5 and/or side wall 4 (i.e. the elements constituting container body 2).

Accordingly, degassing valve 6 is not disposed adjacent to lid 30 and/or lid 50.

According to one aspect, the cut-out 7 comprises one or more cut-outs of suitable shape and/or size and formed in the thickness of the injection cap 30. Allowing the passage of the gas generated by the soluble product through said cut-out, substantially avoiding any passage of the soluble product.

According to one aspect of the valve 6 being in fluid communication with the closed chamber 21 through the cut 7 formed in the injection cap 30 and being isolated from the outside when the valve 6 is in the closed configuration, the cap 30 is arranged behind the valve 6 when the capsule 1 is seen from the outside.

In other words, the cover 30 directly faces the closed chamber 21, i.e. is in direct contact with the soluble product contained in the closed chamber 21.

In the embodiment shown in the figures, the capsule 1 provides for the use of a single valve 6, but having two or more valves 6 is not prohibited if required by the particular application. For example, it may be provided that the valve 6 is arranged near the base 3 and the other valve is arranged near the side wall 4.

In one embodiment of the invention, degassing valve 6 is integrated in the thickness of container body 2, i.e. in the thickness of first base 3 and/or in the thickness of side wall 4. In other words, the valve 6 is made of a single piece or integrated in the thickness of the first base 3 and/or in the thickness of the lateral wall 4.

Making the valve 6 within the thickness of the base 3 and/or the side walls has the following advantages: since the valve 6 is inserted within the thickness of the base 3 and/or the side wall 4, any damage and/or tampering, even if incidental, of the valve 6 is prevented.

According to a preferred embodiment, which will be explained below, the first base 3 (i.e. the base with the smaller diameter in the case of the frustoconical configuration of the capsule 1) is shaped so as to house the degassing valve 6 in its thickness S (see in particular fig. 4A, 4B and 5).

To this end, also with reference to the figures, the various embodiments can be made with reference to the fact that the first base 3 has:

an inner surface 300 facing the closed chamber 21, an

An outer surface 301 facing the outside of the capsule 1.

With reference also to fig. 2 and 3, the first base 3 comprises a first opening 302 for the passage of the extraction fluid from the outer surface 301 to the inner surface 300 of the first base 3 (i.e. the base with the smaller diameter), and a second hole 303 for the passage of the gas generated by the soluble product contained in the closed chamber 21.

Thus:

gas released by the soluble product when the pressure inside the chamber 21 (for example CO in the case of fresh coffee)₂) While increasing, the degassing valve 6 is actuated by gas in its open configuration to allow gas to flow out of the capsule 1 through the cut 7 provided in the injection cap 30 and through the opening 303. The path followed by the gas released by the product from the chamber 21 to the outside of the capsule 1 is shown in dotted lines in fig. 4B;

extracting the fluid (e.g. H) when the capsule 1 is used for preparing a beverage₂O water) opens the injection cap 30 to enter the closed chamber 21 through the opening 302. In particular, the extraction fluid acts on the degassing valve 6 to keep the valve 6 in the closed configuration, preventing the entry of extraction fluid through the valve and the exit of the beverage during preparation and dispensing, since the extraction fluid, also entering through the opening 303, forces the valve to remain closed. Extraction fluid (e.g. H) supplied by the machine₂O water) is shown in fig. 4A with dashed arrows;

when the optimal mixture is obtained, the beverage is extracted through the lid 50, the lid 50 being able to be engraved (engraved) by a punch belonging to the machine.

As shown, advantageously, the presence of the degassing valve 6 does not involve any dimensional variations (even the thickness S of the first base 3) compared to capsules known in the prior art of beverage production, since the presence of the degassing valve 6 does not affect the supply of extraction fluid and how the beverage is produced and extracted.

This ensures that the capsule 1 can also be used in machines already sold on the market without modifications to the machine and, above all, that the capsule 1 does not increase the thickness of the lid 30, 50 or of the side wall 4.

According to one aspect, the first opening 302 and the second opening 303 are constituted by a plurality of through holes having any shape (preferably having a circular cross section).

In particular, the total opening area of the plurality of holes of the first opening 302 is 1mm²To 8mm²Preferably equal to 4mm²And the total opening area of the plurality of holes of the second opening 303 is 0.5mm²To 3mm²Preferably equal to 1.5mm²。

According to one aspect, the number of holes in the first opening is eight, and the number of holes in the second opening is two.

In a preferred embodiment, referring also to fig. 1C and 1D, the apertures of the first opening 302 are arranged in a circular crown (circular crown) while the apertures of the second opening 303 are arranged along a straight line.

The advantage of this configuration of the holes of the first opening 302 and the second opening 303 is that: after opening the lid 30 in the closed chamber 21, the extraction fluid is allowed to enter uniformly through the holes 302, thereby dosing homogeneously the soluble product, while allowing the gas to exit from the holes 303, thereby concentrating in a specific area and avoiding any dispersion.

In particular, the diameter of the circular crown of the first opening 302 is such as to also contain the aperture of the second opening 303 within the hypothetical region identified by the circular crown.

According to a preferred aspect, the incision 7 is provided in the centre of the circular crown of the first opening.

According to one aspect, with reference also to fig. 2 and 4A-4B, the infusion cap 30 is sealingly associated to the inner surface 300 of the first base 3 by means of a first sealing area 304 and a second sealing area 305.

In particular, due to the two sealing areas 304, 305, the first opening 302 is sealed, thereby avoiding any air entering through the opening 302 during storage of the capsule 1.

The sealing areas 304 and 305 are preferably obtained by heat sealing or by other known techniques, such as those using ultrasound or adhesive materials.

According to one aspect, the injection cap 30 comprises a peripheral portion extending beyond the opening 302 of the first base 3, and the injection cap 30 is designed to sealingly close said opening 302, i.e. without any air and/or gas passage.

Preferably, the infusion cap 30 is a seamless material, i.e. without discontinuities in surface or thickness (i.e. not porous), except for one or more cuts 7 arranged for the passage of the liquid product during the liquid product extraction phase.

According to one aspect, the infusion cap 30 is disc-shaped and can be made of a material that thermally shrinks, tears, punctures, dissolves when the pressurized extraction fluid is supplied by the infusion element of the machine.

In a preferred embodiment, the infusion cap 30 is a non-heat-shrinkable cap that does not tear or dissolve in contact with the extraction fluid, but is raised with respect to the inner surface 300 of the first base 3.

To this end, in use, the sealing region 304 is able to yield, at least in a portion thereof, to the pressure of the extraction fluid passing through the opening 302. In other words, sealing region 304 yields under the effect of the hydraulic pressure exerted by the extraction fluid, i.e. the average tension of infusion cap 30 is higher than the average tension of the portion of sealing region 304 that yields under the effect of the hydraulic pressure. According to one aspect, the yielding seal region 304 is only a portion of the entire seal region. This is due to the fact that: once a portion of the sealing region 304 yields, extraction fluid passing through the gap formed between the second cap 30 and the yielded sealing region 304 reduces its pressure while leaving the unyielded remainder of the sealing region 304 unchanged. In particular, the pressure of the extraction fluid determines that for at least a portion of the peripheral region of the second decomposable barrier cover 30, the sealing region 304 is separated from the second side of the annular portion 3011 of the first base 3 and the pressure of the extraction fluid can vary between 0.5bar and 15 bar.

Alternatively, when the capsule 1 is used in a machine-enclosed chamber, the second sealing area 305 can also be a seal as follows: yielding under the pressure of the extraction fluid passing through said opening 302 at least in a portion of the second sealing area 305 causes the infusion cap 30 to rise with respect to the surface 300 of the first base 3.

As shown in fig. 2, the first sealing area 304 and the second sealing area 305 are shaped as circular crowns, wherein the diameter of the first sealing area 304 is larger than the diameter of the circular crown representing the first aperture 302, and the diameter of the second sealing area 305 is larger than the diameter of the circular crown representing said second aperture 303, but smaller than the diameter of the circular crown representing the first aperture 302.

The beverage dispensing lid 50 is sealingly associated to the second base 5, i.e. the beverage dispensing lid 50 provides a gas tight seal.

According to a preferred embodiment, the second base 5 defines an annular edge 501 and the beverage dispensing cap 50 is sealingly associated to the annular edge 501 by means of a sealing area (not shown in the figures).

The sealing area is preferably obtained by heat sealing or by other known techniques, such as those using ultrasound or adhesive materials.

The beverage dispensing cap 50 also advantageously has the ability to be pierced or torn and/or a thickness such as to allow the extraction liquid to be opened under pressure.

According to one aspect, the beverage dispensing cap 50 is disc-shaped and, for example, without cut-outs, i.e. the beverage dispensing cap 50 has no yielding area, but is still in contact with the mechanisms of the device intended to supply pressurized extraction fluid according to known and therefore unexplained techniques.

According to one aspect, as shown in fig. 2 and 3, the first base 3 may have an engraved structure, i.e. with portions that are respectively convex and concave.

In particular, the first base 3 comprises, when viewed from the outside:

-a central portion 3010;

a ring-shaped portion 3011 surrounding the central portion 3010, the ring-shaped portion 3011 being configured to be recessed with respect to the central portion 3010,

a first opening 302 is provided in the ring-shaped portion 3011, a second opening 303 is provided in the central portion 3010,

and, a cut 7 is provided in said central portion 3010.

According to one aspect, the first sealing area 304 and the second sealing area 305 are provided in the annular portion 3011, i.e. in the surface facing the closed chamber 21, so that the infusion cap 30 is arranged inside the closed chamber 21, in direct contact with the soluble or extractable product.

It should also be noted that in the recessed area 3013 facing the outside of the capsule, the head of the machine can be inserted without thereby contacting the injection cap 30.

As shown in fig. 2 and 3, the ring-shaped portion 3011 is preferably connected to the side wall 4 of the capsule 1 by means of a portion 3012 having a preferably rectilinear shape, which portion 3012 serves as a support for the capsule 1 when the capsule 1 is arranged on a support plane.

According to a characteristic aspect of the present description, the degassing valve 6 comprises:

a valve body 60 formed in a single piece in the thickness S of the first base 3.

A membrane 62 movable with respect to said body 60 between a first operative open position, which allows the passage of gas from the closed chamber 21 to the outside (fig. 4B), and a second operative position, which prevents the passage of gas and the extraction of fluids into the closed chamber 21 (fig. 4A), said first operative position being allowed when a predetermined gas threshold is reached;

a holding member 63 for preventing the movable membrane 62 from being lost.

In other words, degassing valve 6 is a one-way type valve, which is normally closed, preventing the release of the gas contained in chamber 21, degassing valve 6 opening when the pressure value of chamber 21 is above a threshold value, allowing the gas to leave chamber 21, and degassing valve 6 closing again when the pressure value inside chamber 21 returns below the threshold value, maintaining the characteristics of the soluble product.

According to one aspect, the movable membrane 62 is configured close to the second opening 303 so as to open/close the opening 303 based on the discharge requirement of the gas generated in the hermetic chamber 21. To this end, the film 62 has a sufficient surface size to cover the second opening 303.

In order to allow passage between the two operating positions of the membrane 62, use is preferably made of a biodegradable oil (for example coffee oil) which acts as a sealant between the valve body 60 and the membrane 62.

It should be noted that during the supply phase of the extracted fluid, this fluid passing through the opening 303 forces the membrane 62 to remain closed by pushing the membrane 62 against the valve body 60, avoiding any leakage of the beverage from the chamber 21 during preparation and dispensing.

The movable film 62 has a thickness of not less than 20 μm and may be made of a material such as PLA or polyester.

In the embodiment of the degassing valve 6 shown in fig. 4A and 4B, the sealing member 63 ensuring that the movable membrane 62 is not lost comprises a protective element 70, the protective element 70 being associated with the outer surface 301, i.e. the surface facing the outside of the capsule 1.

The protection element 70 is arranged at the movable element 62 of the degassing valve 6 and is configured to protect this movable element 62 from substances outside the capsule.

The protection element 70 is implemented as a disc-shaped element associated with the surface 301 of the first base 3 so as to cover the first base 3 completely, i.e. to cover the entire surface of the first base 3. The adhesion of the protective element 70 to the surface 301 of the first base 3 is achieved by means of heat sealing or by other known techniques, such as those using ultrasound or adhesive materials.

According to one aspect, the protective element 70 is preferably made of a biodegradable material that is permeable to liquids.

In use, the protective element 70 is an element pierced by the head of the machine in order to supply the extraction fluid.

An alternative embodiment of the movable membrane 62 (not shown in the figures) provides for the use of a rubber element, preferably made of a disc-shaped elastomer (even NBR) with a thickness of at most 1.5 mm. The rubber element is also held in place by the protective element 70.

In the embodiment of degassing valve 6 shown in fig. 5, similar to the other features of the degassing valve shown in fig. 4A and 4B, the retaining means comprise a cover 632, the cover 632 being configured to mechanically engage with the outer surface 301 of the first base 3, so as to prevent the loss of the movable membrane 62 in the open position and to protect said degassing valve 6 from the substances outside said capsule 1.

It should be noted that the embodiment of the valve of fig. 5 need not provide the protective element 70.

According to one aspect, the capsule 1 comprises a filter 40, the filter 40 being configured to prevent the product from leaving the closed chamber 21 towards the degassing valve 6.

The filter 40 is interposed between the filling cap 30 and the valve body of the degassing valve 6.

To this end, the capsule 1 comprises a seat 41, the seat 41 being formed in the thickness S of the first base 3 in the vicinity of the inner surface 300, the seat 41 being shaped so as to house the filter.

The filter 40 is implemented in an element made of paper, plastic and cellulose material.

Obviously, a man skilled in the art, in order to satisfy contingent and specific requirements, may make numerous modifications to the variants described above, all of which are however contained within the scope of protection defined by the following claims.