CAPSULE FOR PREPARING A BEVERAGE

Abstract

Capsule intended for receiving a substance for preparing a beverage using a coffee machine or infusion machine, to be held by a piston during the passage of the extracting liquid after piercing of the base by the pins of the piston. The capsule made from injected plastic material has a base (1) and a side wall (3) together forming part of a frustrum of a cone, as well as a rim (4) covered by a lid (5) after the filling of the capsule with the substance. The side wall (2) is shaped as a single cone frustrum between the rim (3) and the open (12) base (1), formed as a flattened ring (11), connected to the side wall (2). The side wall (2) is covered by a label (23) and the open base (1), including the ring (11) thereof, is covered by a sealed lid (14) inside the base.

Claims

1. Capsule designed to accommodate a substance for the preparation of a beverage when the capsule is inserted into the housing in a machine of coffee or infusion machine type, to be held therein by a piston during the passage of the extracting liquid through the capsule and the substance that it contains, after the piercing of the bottom by the piston's studs: the capsule made of injected plastic having a bottom (1) and a side wall (3) essentially fitting within a cone frustum, and one edge (4) covered by a membrane seal (5) after loading of the substance into the capsule; the said capsule being characterized by the fact that: the side wall (2) is formed from a single cone frustum between the rim (3) and the bottom (1); the bottom (1) is flat, composed of an interior crown (11) connected to the side wall (2) and surrounding a central opening (12); the side wall (2) is covered with a sealed label (23), and the open bottom (1)including its interior crown (11)is covered with a sealed membrane (14).

2. Capsule in accordance with claim 1, characterized by the fact that the sealed membrane (14) is an interior membrane seal.

3. Capsule in accordance with claim 1, characterized by the fact that the label (23) and the membrane seal (14) are rendered integral by the capsule's injection molding.

4. Capsule in accordance with claim 1, characterized by the fact that the central opening (12) of the bottom (1) is circular.

5. Capsule in accordance with claim 1, characterized by the fact that it incorporates a cross brace (13) composed of a central hub (131) that is connected to the crown (11) by branches (132) entering the volume of the capsule so as not to be touched by the studs.

6. Capsule in accordance with claim 1, characterized by the fact that the crown (11) has a flattened frustoconical shape.

7. Capsule in accordance with claim 1, characterized by the fact that the label (23) and the membrane seal (14) are made of aluminum foil, and by the fact that the membrane seal is notably embossed.

8. Capsule in accordance with claim 1, characterized by the fact that the label (23) and the membrane seal (14) are made of a complex composed of an aluminum (AL) or (EVOH) foil of which the two faces are covered with a film in a plastic chosen from the group including PP, PLA.

9. Capsule in accordance with claim 1, characterized by the fact that the label (23) is of greater height than the height of the side wall (2), so that the upper edge of the labelwhich overhangsis incorporated into the rim (3) of the capsule during the injection of the plastic to produce the capsule.

10. Capsule in accordance with claim 1, characterized by the fact that the branches (137) are radial.

11. Capsule in accordance with claim 1, characterized by the fact that the bottom (1) incorporates an inwardly-turned peripheral edge (22) constituting a bearing point for stacking empty capsules.

12. Capsule in accordance with claim 1, characterized by the fact that the interior crown (11) has a flat exterior surface (113) and a frustoconical interior surface (112).

13. Capsule in accordance with claim 1, characterized by the fact that the interior surface of the conical wall (2) incorporates brackets (21) limiting the extent of insertion of a nested capsule.

14. Capsule in accordance with claim 13, characterized by the fact that the brackets (21) have a bearing surface (211) above the cross brace (13) so that the membrane seal (14) covering the bottom of an inserted capsule does not press against the branches (132) of the cross brace (13) of the capsule in which this other capsule is nested.

15. Production process for a capsule in accordance with claim 1, characterized by the fact that: one produces a mold (200) for a capsule (100) having a side wall (2) in cone frustum form, endowed with a rim (3) at the large base of the cone frustum, and of which the flat summit of the bottom (1) of the capsule is in the form of an interior ring (11) bounding a central opening (12); the mold (200) is composed of a part having a cavity (210) in the shape of the frustoconical side wall of the capsule, with the bottom of the cavity corresponding to the bottom (1) of the capsule, being endowed with a surface in relief (12A) to form the opening (12) of the bottom of the capsule; the other part of the mold is a core (250) defining the interior surface of the capsule; one places a label (23) within the mold cavity, having a shape matching the shape of the frustoconical side wall (2); in the core (250), one places the membrane seal (14), then one closes the mold, and then one injects the plastic.

16. Process for the production of a capsule in accordance claim 15, characterized by the fact that one places the membrane filter (14) on the core (250), and then closes the mold and injects the plastic.

Description

DRAWINGS

[0033] The invention herein will be described below in more detail, by virtue of examples of capsules illustrated in the appended drawings, in which:

[0034] FIG. 1A is a view in perspective of one method of implementation of a capsule according to the invention, in the overturned position;

[0035] FIG. 1B is a view in perspective of the interior of the capsule before its filling and closure;

[0036] FIG. 2A is an axial cross-section of the capsule in FIG. 1;

[0037] FIG. 2B is a top view of the capsule in FIG. 1;

[0038] FIG. 3 is an illustration of a label covering the frustoconical wall of a capsule;

[0039] FIG. 4A is a cross-section of the bottom part of the capsule, without the membrane seal and without the label;

[0040] FIG. 4B is a view similar to that of FIG. 4a with the label and the membrane seal,

[0041] FIG. 5A is a cross-section of the lower part of an injection mold, which is closed but empty;

[0042] FIG. 5B is a cross-section like the one in FIG. 5a, with the label and the membrane seal in position, before injection molding;

[0043] FIG. 6 is an axial cross-section of the nesting of two empty capsules;

[0044] FIG. 7 is an in-perspective top view of the second method of implementation of the capsule according to the invention;

[0045] FIG. 8 is an axial cross-section of the capsule in FIG. 7;

[0046] FIG. 9 is a top view of the capsule in FIG. 7, showing the interior structure;

[0047] FIG. 10 is an illustration of a label foil covering the frustoconical wall of a capsule;

[0048] FIG. 11 is an in-perspective top view of a third method of implementation of a capsule according to the invention;

[0049] FIG. 12 is an axial cross-section of the capsule in FIG. 11;

[0050] FIG. 13A is a bottom view of the capsule in FIG. 11;

[0051] FIG. 13B is a top view of the capsule in FIG. 11;

[0052] FIG. 14 is an axial cross-section of the nesting of two empty capsules in accordance with FIG. 11;

[0053] FIG. 15 is a schematic cross-section of the capsule in FIG. 11, in the coffee machine's piston.

DESCRIPTION OF ONE FORM OF IMPLEMENTATION OF THE INVENTION

[0054] As illustrated in FIGS. 1A and 1B, the invention addresses a capsule 100 intended to accommodate a substance such as a coffee or tea powder for the preparation of a beverage. This capsule 100 is fitted into the housing of a coffee or infusion machine. It is held by a piston endowed with studs to penetrate the bottom of the capsule 100. The other side of the capsule covered by a membrane seal is traversed by the pin(s) injecting the water to impregnate the powder. The known machine itself is not shown.

[0055] The capsule 100 globally has a form of revolution or, more generally, it is rotationally symmetrical with respect to its axis XX. Although this example shows a capsule having a conical form of revolutioni.e. of circular cross-sectionthis form can also be rotationally symmetrical, with a polygonal cross-section.

[0056] The orientation chosen conventionally in the various Figures does not correspond to an imposed orientation, or the positioning of the capsule 100 within the machine. As a language convention, the small base or the summit of the frustoconical shape is bottom 1, and the large baseedged by the rim 3is referred to as the top. Thus, in FIG. 1A, the capsule is illustrated in the overturned position in relation to the position of the capsule in the other illustrations.

[0057] The capsule 100 is composed of a frustoconical volume bounded by bottom 1, and a frustoconical wall 2 formed from one single cone frustum with a right-hand generatrix between the bottom 1 and the rim 3 surrounding the opening at the top of the capsule.

[0058] The flat bottom 1 is composed of an interior crown 11 connected to the side wall 2, and encloses a central opening 12 bounded by the interior rim 111 of the crown 11. The opening 12 left free by the central crown 11 corresponds to the surface for which the capsule 100regardless of its orientation around the axis XX when it is positioned within the cavity in the machineencounters studs that penetrate the bottom.

[0059] The bottom 1 is covered by a membrane seal 14 connected to the crown 11, on the interior side of the capsule, that will be pierced by the studs.

[0060] The upper edge of the frustoconical side wall 2 is connected to the rim 3, of which the upper face 31 is smooth (FIG. 1B). The lower face (FIG. 1A) is surrounded by a rigidifying crown 32 and an exterior crown 33 that itself surrounds the sealing lips 34 interacting with the sealing system of the machine's piston (FIG. 2A).

[0061] According to FIGS. 1B, 2A, 2B, the interior surface of the frustoconical wall 2 incorporatesnear the bottombrackets 21, of which the top is a bearing surface 211 within a plane perpendicular to the axis XX, to accommodate the bottom rim 22 of the frustoconical wall 2 of a nested capsule.

[0062] FIG. 2A shows a schematic illustration, via non-continuous lines, of the label 23 surrounding the lateral frustoconical side wall 2 and the membrane seal 4 closing the top of the capsule and the interior membrane seal 14 capping the crown 11 and the central opening 12 of the bottom 1. These various impermeable covering parts are illustrated at a distance from the surfaces that they cover. In reality, they are pressed against them. The label 23 and the membrane seal 24which are impermeablewill preferably be components formed from an aluminum filament, bearing printing where applicable.

[0063] The label 23 covering the side wall 2 is advantageously endowed with decorative printingpersonalized where appropriatethat also bears information such as the origin, a production number, a date or other information concerning the content of the capsule.

[0064] FIG. 2B is a top view of the capsule 100, revealing the interior of the capsule without the membrane seal 14 and the brackets 21. This view of the capsule 100 shows the interior crown 11 with the inclined form of the frustoconical crown 112 of the interior rim 11 and the central aperture 12.

[0065] FIG. 3 shows a flat illustration of a label 23, which is a circular ring-shaped section. The label 23 has a printed or decorated surface 231. The extended form of the label 23 corresponds exactly to the form of the frustoconical surface of the wall 2, such that the similar edgesfor example, the radials 232a and 232bare connected exactly on a generatrix of the side wall 2 of the cone frustum for its impermeability. The edges 232a and 232b are not necessarily radial, and can have a different shape, with the sole proviso that the similar edges must be of complementary form so that they join with each other on the wall 2, without leaving a gap that would give rise to a non-impermeable area. The decorative pattern 231 is preferably such that there is continuity on the periphery of the wall 2.

[0066] The interior membrane seal 14 covering the bottom 1 is an aluminum foil that can bear markings and/or information, or can be a decorative or advertising-bearing surface. The membrane seal 14 is positioned within the cavity in the mold before the injection of the capsule.

[0067] The flat interior membrane seal 14 is pressed against the crown 11, to connect with the rim of the bottom rim (exterior side) of the label 23 covering the side wall 2, to connect with the interior of the capsule.

[0068] The membrane seal 4 covering the top and closing the capsule is positioned and joined to the rim 3 once the capsule has been filled with the product.

[0069] FIG. 4A shows an enlargement of an axial cross-section of the bottom part of the capsule 100, without either the label 23 or the membrane seal 14, showing the structure of the bottom 1, with its interior crown 11 and its interior rim 111, which is connected to the side wall 2 by means of a highly-belled-out frustoconical crown 112. Under this crown 112, there is the bottom rim 22 of the side wall 2. The bottom 113 of the crown 11 is flat. The bottom rim 22which has an offset formenables precise stacking of empty capsules 100a, 100b, such as illustrated in FIG. 6, preventing the bottom of a capsule sliding over a bracket and thereby jamming this capsule within the capsule accommodating it. This cross-section also shows the reinforcements provided by the brackets 21 combined with the interior crown 11, so that the side wall 2 properly withstands the thrust of the studs penetrating the membrane seal 14 without distorting the side wall 2, with the risk of jamming the capsule within the machine.

[0070] FIG. 4B, which is a cross-section similar to FIG. 4A, shows the label 23 covering the side wall 2 as far as the bottom rim 22, as well as the interior membrane seal 14 connected to the frustoconical crown 112, as far as rim 111 and covering the central opening 12.

[0071] The membrane seal 14, which is heated by the temperature of the injection mold, shrinks during cooling when the injected capsule is released from the mold, so that the part of the membrane seal covering the central opening 12 extends, which is advantageous for the appearance and for facilitating the piercing by the machine's studs.

[0072] FIGS. 5A and 5B show a closed, empty injection mold 200 (FIG. 5A), and the same mold when closed and empty but with the label 23 and the membrane seal 14 positioned before the injection of the material (FIG. 5B). The empty part of the injection mold 200 bears the same references as the corresponding parts of the capsule, with the suffix A.

[0073] The injection mold 200 according to this example is composed of one part with the cavity 210 corresponding to the shape of the exterior surface of the capsule, and one part in relief forming the core 250 endowing the shape of the interior surface of the capsule. The means of securing of the label 23 and the membrane seal 14 within the moldby depression, for exampleare not illustrated.

[0074] The cavity 210 incorporates a bottom 211 of which the central part 12a is in relief so as to form the central aperture 12, since the membrane seal 14 will be on the inside and not the outside of the capsule. The edge of the bottom 211 incorporates a peripheral relief 22A to produce the rim 22 of the capsule. This relief with sharp edge towards the exterior forms a shoulder for precisely positioning the bottom edge of the label 23 (FIG. 5B).

[0075] The core 250 has a peripheral wall receded from the top of the relief 12A of the cavity 250, to take account of the thickness of the membrane seal. The core 250 also has hollow areas 21A to form the brackets 21.

[0076] The bottom 251 is surrounded by the frustoconical form 112A, to produce the thickness of the frustoconical crown 112 on the bottom edge 22 and the peripheral relief 22A.

[0077] FIG. 5B shows the closed mold 200 after the insertion of the label 23 and the membrane seal 14. The label 23 presses, at its lower edge, against the relief 22A and the membrane seal 14 is held tightly between the bottom 251 of the core and the top of the relief part 12A of the cavity, so that it is sufficient to set the exterior edge 141 of the membrane seal 14 against the frustoconical surface 212A of the core 250 for the material not to pass between the edge 141 of the membrane seal and the frustoconical surface 12A of the core 250.

[0078] FIG. 5B shows that the entire surface of the capsule is thus covered by the label 23 and the membrane seal 14, ensuring that the capsule is hermetically sealed.

[0079] It should also be noticed that the membrane seal 14 is tightened between the core 250 and the bottom 12A of the cavity 210, such that it is effectively brought to the temperature of the mold so as to subsequently procure the shrinkage of the membrane seal 14 and its placement under tension through the cooling of the capsule released from the mold.

[0080] The process of production of a capsule 100 with the mold described above consists in producing a capsule mold so as to perform injection molding with it.

[0081] Before the injection of the capsule, the label 23 is secured within the cavity of the mold and the interior membrane seal 14 is secured to the core, each time in the respective position of the label 23 and the membrane seal 14 within the capsule once finished.

[0082] The two components 23, 14 are held in place by depression, for example, to prevent the local detachment of one or other of the components and passage of the material to be injected under the foil of the label or membrane seal. After the closure of the mold 200, the plastic material is injected.

[0083] The mold 200 typically incorporates several ensembles such as described above, namely multiple cavities and as many associated cores.

[0084] FIG. 6 is a cross-section showing the nesting of two capsules 100a and 100b. The capsules are nested after their manufacturing and prior to filling.

[0085] The description of the second and third methods of implementation below uses the same numeric references for the same components, with the suffix (a) for the first method of implementation and the suffix (b) for the second method of implementation.

[0086] FIGS. 7 and 8 show the second method of implementation of a capsule 100a designed to accommodate a substance such as a coffee or tea powder for the preparation of a beverage. This capsule 100a is installed within the housing of a coffee or infusion machine. It is held by a piston 200 (FIG. 9) endowed with studs 210 to pierce the bottom of the capsule 100a. The other side of the capsulewhich is covered by a membrane sealis traversed by the pin(s) injecting the water to impregnate the powder. The machine is not shown, being already known.

[0087] The orientation chosen conventionally in the various Figures is not an imposed orientation or that of the positioning of the capsule within the machine. In the orientation in the Figures, the bottom part is the bottom and the top part is the top.

[0088] FIG. 7 shows the capsule 100a, which is essentially of a revolution form in relation to its axis XX.

[0089] The capsule 100a is composed of a frustoconical cavity bounded by the bottom 1a and a frustoconical wall 2a formed from a single cone frustum with straight generatrix between the bottom 1a and the rim 3a surrounding the opening at the top of the capsule.

[0090] The open bottom 1a is formed from a frustoconical crown 11a connected to the side wall 2a and surrounding its circular central opening 12a. The bottom edge 111a of the frustoconical crown 11awhich is also the interior rim bounding the opening 12apartially outlines a plane.

[0091] The upper edge of the frustoconical side wall 2a is connected to a rim 3a of which the upper face 31a is smooth. The bottom face is surrounded by a rigidifying crown 32a extending beyond the exterior crown 33a, which itself surrounds the sealing lips 34a interacting with the sealing system of the machine's piston.

[0092] The interior surface of the frustoconical wall 2a incorporatesnear the bottombrackets 21a of triangular cross-section with a bearing surface 211a on the top. The bearing surface 211a forms a plane perpendicular to the axis XX, to accommodate the bottom edge 22a of the frustoconical wall 2a of a nested capsule.

[0093] FIG. 8 is a schematic illustration of the label foil 23a surrounding the frustoconical side wall 2a, and the membrane seal 4a closing the top of the capsule and the membrane seal 14a capping the bottom of the capsule, including the frustoconical crown 11a and the central opening 12a of the bottom 1a. These various covering parts are illustrated at a distance from the surfaces that they cover. In reality, they are pressed against them.

[0094] The label foil 23a covering the side wall 2a is an aluminum foil advantageously endowed with decorative printingpersonalized where appropriatethat also contains information such as the origin, a production number, a date or other information about the content of the capsule.

[0095] FIG. 10 shows the flat extension of a label foil 23, which is a ring-shaped section. The label foil 23 incorporates a printed or decorated surface 231. The extended shape of the label foil 23 exactly matches the shape of the frustoconical surface of the wall 2a, so that the radial edges 232 connect to each other exactly on a cone frustum generatrix. The decorative pattern 231a is preferably such that there is continuity over the periphery of the wall 2a.

[0096] The label foil 23 is incorporated into the frustoconical wall 2a at the moment of injection molding. For this, it is placed in the cavity in the injection mold, and one then injects the plastic to form the capsule and render the label foil integral with the frustoconical wall of the capsule.

[0097] The membrane seal 14 covering the bottom 1 positioned after the injection of the capsule is heat-sealed.

[0098] The flat membrane seal 14which will preferably be embossedis folded against its central disc 141 and its ring-shaped rim 142 is pressed against the frustoconical crown 11a, to connect with the label foil 23 covering the side wall 2a. The circular disc 141 covers the opening 12a of the bottom.

[0099] The membrane seal 4 covering the top is positioned and secured to the rim 3a once the capsule has been loaded with product.

[0100] FIG. 9 is a top view of the capsule 100a, showing the flattened frustoconical crown 11a bounding the opening 12a of the bottom, the side wall 2a and the bottom of the rim 3a, with its rigidifying crown 32a, its exterior crown 33a, and its sealing lips 34a.

[0101] FIG. 8 shows the interior of the capsule, with the brackets 21a on the interior surface of the frustoconical wall 2a.

[0102] FIGS. 11 and 12 show the third form of implementation of the capsule 100b without the membrane seal that normally covers its bottom. The capsule has essentially a revolution form in relation to its axis XX.

[0103] The parts of the capsule 100b of this third form of implementationwhich corresponds to the second form of implementationhave the same numeric references, with the suffix (a) being replaced by the suffix (b). The parts that are different have numeric references without a suffix. Such is the case for the label foil 23 and the membrane seal 4 covering the top, and for the membrane seal 14 covering the bottom 1a.

[0104] The capsule 100b is composed of a frustoconical cavity bounded by the bottom 1b and a frustoconical wall 2b composed of a single cone frustum with straight generatrix between the bottom 1b and the rim 3b surrounding the opening at the top of the capsule.

[0105] The open bottom 1b is composed of a frustoconical crown 11b joined to the side wall 2b and surrounding the circular central opening 12b of the bottom. This opening within the crown 11b is occupied by cross brace 13 composed of a hub 131 with branches 132 that connect it to the frustoconical crown 11b. The bottom edge 111b of the frustoconical crown 11b, which is also the interior edge bounding the opening 12b, and the cross brace 13b partially define a plane.

[0106] The inwardly-curved branches 132 connected to the rear of the frustoconical crown 11b are equally distributed around the axis XX of the capsule. The branches 132b are preferably radial.

[0107] The branches 132b of the hub are inwardly curved so as to enter the volume within the capsule and be positioned at a distance from the plane of the bottom that is sufficient to prevent the studs 210 of the machine's piston 200 are not likely to touch either of the branches 132, in accordance with the random orientation of the capsule placed in the machine (see FIG. 15).

[0108] The upper edge of the frustoconical side wall 2b is connected to a rim 3b, of which the upper face 31b is smooth. The bottom face is surrounded by a rigidifying crown 32b beyond the exterior crown 33b itself surrounding the sealing lips 34b interoperating with the sealing system of the machine's piston 210.

[0109] The cross brace 13 is used for the injection of the plastic into the capsule's mold; the hub 131 corresponds to the point of arrival of plastic in the mold, which is then distributed by the branches 132 towards the frustoconical crown 11b and the side wall 2b to the rim 3b. The branches 132 are regularly oriented around the axis of revolution XX, and their cross-section is appropriate to allow the passage of the plastic under pressure, so that it arrives easily at the locations most distant from the injection point, in the sealing lips of the bottom of the capsule's rim 3b.

[0110] The interior surface of the frustoconical wall 2b incorporatesnear the bottombrackets 21b of triangular cross-section with, on the bottom, a bearing surface 211b. The bearing surface 211b forms a plane perpendicular to the axis XX, to accommodate the bottom edge 22b of the frustoconical wall 2b of a nested capsule, so that its bottom 1b is located above the inwardly-curved branches 132 of the capsule within which it is positioned, and so on.

[0111] FIG. 12 shows a schematic illustration of the label foil 23 surrounding the frustoconical side wall 2b, as well as the membrane seal 4 forming the top of the capsule and the membrane seal 14 capping the bottom of the capsule, including the frustoconical crown 11b and the central opening 12b of the bottom 1b. These various covering parts are illustrated at a distance from the surfaces that they cover. In reality, they are pressed against them.

[0112] The label foil 23 covering the side wall 2b is, as already stated, an aluminum foil advantageously embellished with decorative printingpersonalized where appropriatethat also contains information such as the origin, a production number, a date, or other information about the content of the capsule.

[0113] The label foil 23 is incorporated into the frustoconical wall 2 at the moment of injection molding. For this, it is placed in the cavity of the injection mold, and the plastic is then injected to produce the capsule and also render the label foil integral with the frustoconical wall of the capsule.

[0114] The membrane seal 14 covering the bottom 1b is positioned after the injection of the capsule, because the opening 12b at the bottom enables the positioning of the movable parts of the injection mold, which are not illustrated. The membrane seal 14 is then heat-sealed to the frustoconical crown 11b.

[0115] The flat membrane seal 14which is preferably embossedis folded against its central disc 141 and its ring-shaped edge 142 is pressed against the frustoconical crown 11b, to connect with the label foil 23 covering the side wall 2b. The circular disc 141 covers the opening 12b of the bottom, and presses against the bottom surface of the hub 131.

[0116] The membrane seal 4b covering the top is positioned and secured to the rim 3b once the capsule has been filled with product.

[0117] FIG. 13A is a top view of the capsule 100b showing the cross brace 13 composed of three branches 132 distributed at equal angles, with the flat frustoconical crown 11b bounding the opening 12b of the bottom, the side wall 2b and the bottom of the rim 3b, with its rigidifying crown 32b, its exterior crown 33b and its sealing lips 34b.

[0118] FIG. 13B is a top view of the capsule 100b, showing the interior of the capsule with the cross brace 13, its hub 131, its three branches 132, and the brackets 12b. Certain brackets 21b are preferably positioned on the interior surface of the frustoconical wall 2b, in the same radial plane as the branches 132 of the cross brace. Other brackets 21b are in an intermediate position, so as to have six brackets 21b forming a regular bearing surface within the capsule 100b.

[0119] FIG. 14 is a cross-section showing the nesting of two capsules 100b (or 100a). The capsules are nested after their manufacture and before filling. The bottom of the capsules is, at this time, already fitted with the membrane seal 14. The bearing surface 211b of the brackets 21b is located at sufficient height for the downwardly-pressed capsule 100b, which bears via the bottom edge 22b of its frustoconical wall 2b against the bearing surface 211b of the brackets 21b of the wall 2b, namely such that the surface of the membrane seal 14 covering the opening 12b of the bottom is level and, preferably, above the highest part of the branches 132 of the cross brace 13, so that the membrane seal 14 is unlikely to be damaged or dented by a branch 132 of the cross brace 13 of the capsule 100 in which it is nested.

[0120] FIG. 15 shows a schematic illustration of the machine's piston 200 with its studs 210 salient at the moment of closure of the chamber in which the capsule 100 has been placed. The studs 210 pierce the membrane seal 14 to allow liquid to pass through, but they do not touch the branches 132 of the cross brace, and are unlikely to distort the capsule and cause it to become jammed in the piston 200.

[0121] The references used in the description will be simplified in the claims, and are restricted to the numeric part only.

PARTS LIST OF PRINCIPAL COMPONENTS

(Without the Literal References)

[0122] 100 Capsule [0123] 1 Bottom of capsule [0124] 11 Interior crown/frustoconical crown [0125] 111 Interior rim/bottom edge [0126] 112 Frustoconical crown [0127] 113 Flat exterior surfaces [0128] 12 Central opening [0129] 13 Cross brace [0130] 131 Hub [0131] 132 Branch [0132] 14 Interior membrane seal of bottom [0133] 141 Edge of the membrane seal [0134] 142 Central disc [0135] 2 Frustoconical side wall [0136] 21 Bracket [0137] 211 Bearing surfaces [0138] 22 Bottom edge [0139] 23 Label/foil label [0140] 231 Printed surfaces [0141] 232a,b Edges of the label [0142] 3 Rim of the capsule [0143] 31 Upper surface [0144] 32 Rigidifying crown [0145] 33 Exterior crown [0146] 34 Sealing lips [0147] 4 Membrane seal of capsule top [0148] 200 Injection mold [0149] 210 Cavity [0150] 211 Bottom [0151] 212A Frustoconical surface [0152] 250 Core [0153] 251 Top of core [0154] 2A Gap [0155] 12A Relief of bottom of the cavity [0156] 21A Hollow [0157] 300 Piston [0158] 310 Stud [0159] 22A Peripheral relief [0160] 112A Frustoconical surface