Capsule, Device and Method for Preparing a Beverage by Extraction
The invention relates to a capsule for use in a device for preparing beverages. The invention also relates to an assembly of such a capsule and a device for preparing beverages. The invention further relates to a method for preparing beverages by making use of such an assembly.
Latest BISERKON HOLDINGS LTD. Patents:
The invention relates to a capsule for use in a device for preparing beverages. The invention also relates to an assembly of such a capsule and a device for preparing beverages. In addition, the invention relates to a perforation structure evidently intended for use in such a capsule according to the invention. The invention also relates to the use of such a capsule in a device for preparing beverages. The invention further relates to a method for preparing beverages by making use of such an assembly.
Diverse capsules for use in a device for preparing beverages are known in the prior art. A known capsule as described for instance in EP 0512468 comprises a housing provided with a perforable supply side for injecting a liquid into the housing and with a discharge side located at a distance from the supply side and provided with an opening for the purpose of discharging liquid injected into the housing, a quantity of substance for extraction received in the housing, such as ground coffee beans, and a pierceable foil connected to the housing and sealing the opening located on the discharge side. This known capsule can be placed in a device for preparing a beverage. The capsule is placed for this purpose in a receiving space of a capsule holder of the device. The capsule is clampingly supported here in the receiving space by a support and a clamp. The supply side of a housing of the capsule is perforated by subsequently moving a liquid injector through the housing of the capsule, and a relatively hot liquid, in particular water, can be introduced into the housing under a relatively high pressure, generally of between 15 and 20 bar. The foil is perforated by moving a perforation plate forming part of the capsule holder and the capsule toward each other and the extracted liquid flows via the perforation plate into a beverage container. A drawback of using this known capsule and device for preparing a beverage while making use of such a capsule is that the device requires relatively high maintenance. There is therefore a need for a device requiring less maintenance.
An object of the invention is to provide for the above stated need.
The invention provides for this purpose a capsule of the type stated in the preamble, comprising: a housing at least partially filled with a substance to be extracted and/or dissolved, such as ground coffee, wherein the housing is provided with a supply side for pressing a liquid such as water into the capsule, and with a discharge side located a distance from the supply side for discharging liquid provided with extract and/or dissolved substance and guided through the capsule, wherein at least a part of the discharge side of the housing is initially sealed by a perforable foil; a laterally protruding engaging edge connected to the housing to enable clamping of the capsule in a device for preparing beverages; and a perforation structure coupled substantially rigidly to the engaging edge and/or the housing and provided with at least one perforation element facing toward the foil for perforating the foil, which perforation structure is positioned substantially on a side of the foil remote from the housing, wherein perforation of the foil is caused by deformation of the foil during pressing of the liquid through the capsule. By providing the capsule with its own perforation structure for perforating the foil a conventional perforation plate forming part of the device is no longer required. The advantage hereof is that the prepared beverage need no longer be pressed through the conventional perforation plate of the device, but can optionally be delivered directly from the capsule to a drinking cup. This can drastically reduce the beverage residue left behind in the device, this being advantageous from a hygiene viewpoint and reducing the required maintenance on the device. It is moreover possible in this way to prevent, or at least counter, beverage pressed out of the capsule mixing with beverage residues coming from one or more already used capsules and already present in the device, whereby the taste of the beverage to be prepared can be guaranteed as fully as possible. The perforation structure will be connected substantially rigidly (non-displaceably) to the housing, whereby the external dimensioning of the capsule must generally be smaller than or the same as a volume enclosed by the capsule holder. The perforation structure will generally be provided with one or more throughflow channels or throughfeed openings extending between a side of the perforation structure facing toward the foil and a side of the perforation structure remote from the foil. The particular advantage here is that the number of throughflow channels to be applied and the dimensioning of these throughflow channels can be wholly adapted to the nature of the beverage to be prepared, wherein the intensity of the aeration, the extent of the pressure buildup and the swirling of the beverage pressed out of the capsule can be regulated, which can considerably enhance the taste sensation during consumption of the beverage. Because the foil will be perforated by the generally pointed perforation elements and will be pressed during use against the perforation structure, a filtering action will be realized, whereby solid constituents such as coffee dregs can be kept in the housing. The supply side will otherwise generally take a closed form initially, wherein the supply side will be perforated in the device during use. It is also possible to envisage the supply side already being pre-perforated during the production process, whereby further perforation in the device can be dispensed with. The drawback hereof is however that the capsule generally has to be packaged in order to enable a sufficiently long shelf-life of the substance, and therefore of the capsule. Initial, substantially hermetic sealing of the capsule is generally recommended, wherein the capsule can optionally be filled with an inert gas, such as nitrogen or carbon dioxide, in order to further increase the shelf-life of the substance. The result hereof is that a slight overpressure of several hundred millibar will generally be present in the capsule. This overpressure can possibly increase to some extent if coffee powder, which naturally generates a limited amount of gas, is received in the capsule.
The housing can be manufactured from diverse materials, including an aluminum and/or plastic, in particular polypropylene (PP). When a plastic housing is applied, the housing will generally be manufactured from a laminate of a plurality of plastic layers, such as PP and ethylene vinyl alcohol (EVOH). When an aluminum housing is applied, it is generally also usual to laminate the aluminum with one or more additional layers, including a protective lacquer coating in order to avoid direct contact of aluminum with the beverage to be prepared, and including for instance a PP layer to enable realization of an (ultrasonic) welded connection to the foil. The foil generally also comprises aluminum which is optionally provided on one or two sides with a PP layer in order to facilitate one or two-sided adhesion of the foil. It is also possible to envisage the foil comprising aluminum oxide (ALOX), optionally laminated with plastic such as polyethylene terephthalate (PET), whereby an exceptionally thin foil can be obtained with a thickness in the order of magnitude of several microns. The foil is generally connected by means of welding and/or adhesion to the engaging edge, in particular to a flange forming part of the housing.
The perforation structure usually takes a plate-like form in order to limit the volume taken up by the capsule. The perforation structure is preferably positioned at least partially in a volume enclosed by the housing. The advantage hereof is that the dimensioning of the housing need not be adapted to the standard dimensioning of a capsule and capsule holder, this being advantageous from an economic point of view. It is advantageous here for the perforation structure to connect substantially seamlessly to the engaging edge, wherein the perforation structure can even form an integral part of or be integrally connected to at least a part of the engaging edge. It is a further advantage that a side of the perforation structure remote from the foil and a side of the engaging edge are located in the same plane, so that a completely flat underside of the capsule can in fact be realized. The housing and the perforation structure are generally positioned initially on either side of a plane defined by (a central part of) the foil. A suitable material for a perforation structure is plastic, such as for instance PP or polyethylene (PE).
The engaging edge generally comprises at least one flange connected integrally to the housing. It is also possible to envisage the flange being chemically and/or mechanically connected to an inner side and/or outer side of the housing. The engaging edge will usually be constructed in laminated manner from at least one flange connected to the housing and a support structure coupled to the flange, the support structure being optionally integrally connected to the perforation structure. An edge periphery of the perforation structure is optionally connected via at least one connecting element to the engaging edge. The support structure will generally take a substantially annular form here, because the flange will usually have the same shape. It is possible here to envisage the support structure at least partially enclosing, and even being able to clamp, the flange. It is also possible to envisage welding and/or adhering the support structure to the flange, usually with interposing of the foil. The support structure can be constructed from a plurality of parts which are mutually connected during the production process, for instance by means of welding or adhesion.
The perforation structure and the support structure are preferably manufactured at least partially from the same material, such as polypropylene, in order to enable realization of a reliable mutual connection. As already stated, it is also possible to envisage the perforation structure and the support structure being integrally connected to each other and being manufactured in the same production step, for instance by means of injection moulding. The support structure can here in fact be deemed as an (integral) extension of the perforation structure. The support structure is preferably constructed here from a lower part initially connected directly to the perforation plate and an upper part connected to the lower part, wherein the lower part and the upper part are at least positioned at least partially on either side of the flange connected to the housing or forming part of the housing, whereby the flange is at least partially covered on an underside and an upper side by the support structure. The upper part of the support structure can be connected integrally to the lower part of the support structure, wherein the support structure is even manufactured from one material, in particular plastic, preferably polypropylene. The lower part of the support structure will however generally be adapted to initially hold (support) the perforation structure and the upper part of the support structure will generally be adapted as sealing element. It is therefore generally advantageous to select the material properties of the upper part of the support structure such that a reliable sealing of the capsule in the capsule holder can be realized. These selected material properties are preferably also such that a reliable connection can be realized between the lower part of the support structure and the upper part of the support structure. The upper part of the support structure is preferably manufactured for this purpose from a composition comprising polypropylene and an elastomeric copolymer of units of ethylene and units of an ∀-olefin, such as ethylene, propylene or 1-butene. The upper part of the support structure is preferably manufactured at least partially from a composition comprising 20-50% by weight crystalline polypropylene and 50-80% by weight elastomeric ethylene copolymer. Further details of the thermoplastic polypropylene-based elastomer are described in EP 0770106 and EP 0472946. Such thermoplastic polyolefins are commercially available under the brand names Hifax®, in particular Hifax® 7334 XEP, Adflex®, in particular Adflex® X500F, and Softell®. It is otherwise also possible to envisage providing an outer surface of the capsule with at least one other type of sealing element for sealing the capsule in the device.
In an advantageous embodiment the perforation structure is provided with a plurality of throughflow channels for discharge of liquid, the throughflow channels extending from a side of the perforation structure facing toward the foil to a side of the perforation structure remote from the foil. The perforation structure is generally also provided with a plurality of perforation elements. It is possible here to envisage at least a number of throughflow channels being located at a distance from the perforation elements. It is however also possible to envisage, and even advantageous, for at least one perforation element to be provided with one or more throughflow channels. It is found particularly advantageous in practice to apply a conical perforation element through which extend three throughflow channels which debouch in the cone wall, whereby blocking of the throughflow channels by perforated foil parts can be prevented.
For the purpose of being able to prevent blocking of an outer end of a throughflow channel by the device it is advantageous for a side of the perforation structure remote from the foil to be provided with at least one surface groove, the surface groove connecting to at least one outer end of at least one throughflow channel. It is further possible to envisage a side of the perforation structure remote from the foil being provided with a plurality of surface grooves, the surface grooves connecting the outer ends of the throughflow channels to each other. The surface grooves can connect to each other and intersect each other and in this way form a network.
The perforation elements must be sufficiently sharp to be able to perforate the foil. It is therefore advantageous that at least a number of perforation elements take a pointed, in particular pyramid-shaped and/or cone-shaped form. A cone-shaped (conical) shape is generally recommended above a pyramid-shaped embodiment, since the conical embodiment has a periphery varying less pronouncedly as seen in the height of the perforation elements, whereby the foil will tear and/or deform more gradually and therefore more easily.
An edge part of the perforation structure facing toward the foil is generally provided with one or more perforation elements for realizing an edge perforation in the foil. The perforation element can here form a cutting edge which can extend over the whole or partial edge part of the perforation structure. In addition, it is possible to envisage application of more centrally positioned perforation elements. In order to be able to guarantee a reliable perforation, it is generally advantageous that the foil initially engages under bias on at least one perforation element. This is because sufficient pressure buildup in the housing of the capsule will, as a result of the bias, result relatively quickly in perforation of the foil.
In an advantageous embodiment of the capsule a side of the perforation structure remote from the foil is provided with an upright sealing edge which protrudes in a direction away from the foil. This upright sealing edge provides on the one hand for an improved connection of the capsule to the device, and thereby for an improved sealing. The application of the upright sealing edge moreover makes the perforation structure stackable (nestable) with another perforation structure, this being particularly advantageous during the production process.
The invention also relates to an assembly of a capsule according to the invention and a device for preparing beverages, which device comprises a capsule holder for receiving the capsule. The capsule holder here preferably comprises a plurality of holder parts which are mutually displaceable between an opened state, in which the capsule can be placed in the capsule holder, and a closed state in which the engaging edge of the capsule is clamped substantially liquid-tightly by the holder parts.
The invention further relates to the use of a capsule according to the invention in a device for preparing beverages.
In addition, the invention relates to a perforation structure evidently intended for use in a capsule according to the invention. The perforation structure will generally be optionally integrally connected here to a support structure.
The invention moreover relates to a method for preparing a beverage by making use of an assembly according to the invention, comprising of: A) placing a capsule in at least a part of an opened capsule holder, B) closing the capsule holder with substantially liquid-tight clamping of the engaging edge of the capsule, C) pressing liquid, in particular water, into the capsule via the supply side of the capsule, whereby the foil will be pressed against the perforation structure and will be perforated by the at least one perforation element, and D) discharging via the perforated foil liquid guided through the capsule. During step B the supply side is generally also perforated by perforation means forming part of the capsule holder.
The invention will be elucidated on the basis of non-limitative exemplary embodiments shown in the following figures. Herein:
During clamping of the capsule in a capsule holder upper wall 3 of capsule 1 will generally be perforated by one or more cutting elements forming part of the capsule holder, after which, during the preparation process, water—and generally air—will be pressed into the capsule at a pressure of between 1 and 20 bar, whereby foil 8 is pressed against perforation elements 12, whereby foil 8 will be perforated. The assembly of perforated foil 8 and perforation structure 10 will act here as filter, wherein beverage will be allowed through and solid parts, in particular residue, will be held back.
During the clamping particularly engaging edge 11 of capsule 1 is clamped in order to realize a seal between capsule 1 and the capsule holder. It is advantageous here for upper part 9a of support structure 9 to be manufactured from a resilient material such as a TPO. A reliable seal of the capsule in the capsule holder is realized by the thermoplastic character of the material of upper part 9a of support structure 9. Other than conventional thermosetting elastomers (rubber elastomers), thermoplastic polymers are manufactured using equipment suitable for processing resins. Thermoplastic polymers are quicker and easier to manufacture than thermosetting elastomers, which are manufactured in three lengthy steps (mixing, injection moulding and cross-linking). Other than thermosetting polymers, thermoplastic polymers can moreover be fully or partially recycled. Since lower part 9b of support structure 9 is generally manufactured at least partially from PP and ultrasonic welding is recommended to mutually connect lower part 9b and upper part 9a, it is advantageous for a thermoplastic polypropylene-based elastomer to be applied, such as Adflex®, in particular Adflex® X500F.
In the shown first embodiment of capsule 1 according to the invention the following product specifications can be applied. In the case a plastic housing 2 is applied, the wall thickness thereof can vary and be adapted to the functionality of the relevant part of housing 2. The thickness of flange 7 can for instance amount to between 0.30 and 0.65 mm, while the thickness of the upper wall amounts to 0.15 mm. A slight overpressure of 200 to 300 mbar is present in capsule 1 so that deformation of capsule 1 can be resisted prior to use, foil 8 can be pressed against perforation structure 10 and as much oxygen as possible driven out of capsule 1 during the production process. A typical height of the central perforation elements 12 amounts to between 1 and 2 mm, wherein the length of throughflow channels 13 preferably lies between 0.3 and 0.45 mm. The (narrowest) diameter of throughflow channels 13 amounts to between 0.7 and 0.9 mm. The width of connecting elements 11 amounts in this example to between 1 and 2 mm. The overall thickness of engaging edge 14 amounts to about 1.0 mm, wherein the thickness of flange 7 preferably lies between 0.3 and 0.4 mm, the thickness of foil 8 amounts to about 0.02 mm, the thickness of upper part 9a of support structure 9 amounts to about 0.3 mm and the thickness of lower part 9b of support structure 9 also amounts to about 0.3 mm. Applying the above stated dimensioning results in a capsule with a relatively large internal volume of about 14 cm3.
Referring to
It will be apparent that the invention is not limited to the exemplary embodiments shown and described here, but that within the scope of the appended claims numerous variants are possible which will be self-evident to the skilled person in the field.
Claims
1. A capsule for preparing beverages, comprising:
- a housing at least partially filled with a substance to be extracted and/or dissolved, such as ground coffee, wherein the housing is provided with a supply side for pressing a liquid such as water into the capsule, and with a discharge side located a distance from the supply side for discharging liquid provided with extract and/or dissolved substance and guided through the capsule, wherein at least a part of the discharge side of the housing is initially sealed by a perforable foil;
- a laterally protruding engaging edge connected to the housing to enable clamping of the capsule in a device for preparing beverages; and
- a perforation structure coupled substantially rigidly to the engaging edge and/or the housing and provided with at least one perforation element facing toward the foil for perforating the foil, which perforation structure is positioned substantially on a side of the foil remote from the housing, wherein perforation of the foil is caused by deformation of the foil during pressing of the liquid through the capsule.
2. The capsule as claimed in claim 1, wherein the perforation structure is positioned at least partially in a volume enclosed by the housing.
3. The capsule as claimed in claim 2, wherein the perforation structure is connected integrally to at least a part of the engaging edge.
4. The capsule as claimed in claim 1, wherein the foil initially seals the housing substantially medium-tightly.
5. The capsule as claimed in claim 1, wherein the perforation structure takes a substantially plate-like form.
6. The capsule as claimed in claim 1, wherein an edge periphery of the perforation structure is connected via at least one connecting element to the engaging edge.
7. The capsule as claimed in foregoing claims claim 1, wherein the engaging edge comprises at least one flange connected integrally to the housing.
8. The capsule as claimed in claim 1, wherein the engaging edge has a laminated structure and comprises at least one flange connected to the housing and a support structure coupled to the flange and connected to the perforation structure.
9. The capsule as claimed in claim 1, wherein a side of the perforation structure remote from the foil and a side of the engaging edge are located in the same plane.
10. The capsule as claimed in claim 1, wherein at least a part of the engaging edge is manufactured from a resilient material, in particular an elastomer, more particularly a rubber elastomer.
11. The capsule as claimed in claim 10, wherein the resilient material comprises polypropylene.
12. The capsule as claimed in claim 10, wherein the resilient material is manufactured at least partially from a thermoplastic polyolefin (TPO).
13. The capsule as claimed in claim 12, wherein the thermoplastic polyolefin resilient material comprises a composition of polyolefins comprising polypropylene and an elastomeric copolymer, the copolymer comprising units of ethylene and units of an ∀-olefin.
14. The capsule as claimed in claim 13, wherein the ∀-olefin is formed by ethylene, propylene or 1-butene.
15. The capsule as claimed in claim 1, wherein an outer surface of the capsule is provided with at least one sealing element for sealing the capsule in the device.
16. The capsule as claimed in claim 1, wherein the perforation structure is provided with a plurality of throughflow channels for discharge of liquid, the throughflow channels extending from a side of the perforation structure facing toward the foil to a side of the perforation structure remote from the foil.
17. The capsule as claimed in claim 1, wherein the perforation structure is provided with a plurality of perforation elements.
18. The capsule as claimed in claim 16, wherein at least a number of throughflow channels are located at a distance from the perforation elements.
19. The capsule as claimed in claim 16, wherein at least one perforation element is provided with at least one throughflow channel.
20. The capsule as claimed in claim 16, wherein a side of the perforation structure remote from the foil is provided with at least one surface groove, the surface groove connecting to at least one outer end of at least one throughflow channel.
21. The capsule as claimed in claim 20, wherein a side of the perforation structure remote from the foil is provided with a plurality of surface grooves, the surface grooves connecting the outer ends of the throughflow channels to each other.
22. The capsule as claimed in claim 1, wherein at least a number of perforation elements take a pointed, in particular pyramid-shaped and/or cone-shaped form.
23. The capsule as claimed in claim 1, wherein an edge part of the perforation structure facing toward the foil is provided with at least one perforation element for realizing an edge perforation in the foil.
24. The capsule as claimed in claim 1, wherein the foil engages under bias on at least one perforation element.
25. The capsule as claimed in claim 1, wherein a side of the perforation structure remote from the foil is provided with an upright sealing edge which protrudes in a direction away from the foil.
26. The capsule as claimed in claim 1, wherein the capsule is assembled with a device for preparing beverages, which device comprises a capsule holder for receiving the capsule.
27. The assembly as claimed in claim 26, wherein the capsule holder comprises a plurality of holder parts which are mutually displaceable between an opened position, in which the capsule can be placed in the capsule holder, and a closed position in which the engaging edge of the capsule is clamped substantially liquid-tightly by the holder parts.
28-29. (canceled)
30. A method for preparing a beverage by making use of an assembly as claimed in claim 26, comprising the steps of:
- A) placing a capsule in at least a part of an opened capsule holder,
- B) closing the capsule holder with substantially liquid-tight clamping of the engaging edge of the capsule,
- C) pressing liquid, in particular water, into the capsule via the supply side of the capsule, whereby the foil will be pressed against the perforation structure and will be perforated by the at least one perforation element, and
- D) discharging via the perforated foil liquid guided through the capsule.
31. The method as claimed in claim 30, wherein during closing of the capsule holder as according to step B) the supply side of the capsule is perforated by the capsule holder.
Type: Application
Filed: Jun 20, 2011
Publication Date: Jun 19, 2014
Applicant: BISERKON HOLDINGS LTD. (Nicosia)
Inventors: Sander Gordon Zweed (Bussum), Jan Andreae (Blaricum), Mark Eric Anton Arthur Klep (Andel)
Application Number: 13/805,025
International Classification: B65D 85/804 (20060101);