WO2020017964A1 - Capsules contenant une substance à partir desquelles une boisson peut être produite ayant un joint racleur fusionnant avec la paroi latérale - Google Patents

Capsules contenant une substance à partir desquelles une boisson peut être produite ayant un joint racleur fusionnant avec la paroi latérale Download PDF

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Publication number
WO2020017964A1
WO2020017964A1 PCT/NL2019/050453 NL2019050453W WO2020017964A1 WO 2020017964 A1 WO2020017964 A1 WO 2020017964A1 NL 2019050453 W NL2019050453 W NL 2019050453W WO 2020017964 A1 WO2020017964 A1 WO 2020017964A1
Authority
WO
WIPO (PCT)
Prior art keywords
capsule
wiper seal
side wall
pressing sleeve
flexible wiper
Prior art date
Application number
PCT/NL2019/050453
Other languages
English (en)
Inventor
Anthony Kay
Original Assignee
Euro-Caps Holding B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Euro-Caps Holding B.V. filed Critical Euro-Caps Holding B.V.
Publication of WO2020017964A1 publication Critical patent/WO2020017964A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/8043—Packages adapted to allow liquid to pass through the contents

Definitions

  • This invention relates to capsules for containing a substance from which a beverage can be produced.
  • the system which is widely known as the Nespresso (Registered Trade Mark) system uses capsules that contain the substance from which the beverage is produced.
  • the substance initially was ground coffee but subsequently capsules containing other substances such as milk powder, hot chocolate and tea have been introduced.
  • Nespresso capsules are of aluminium foil and each has a frustoconical side wall, a transverse base wall at the smaller diameter end of the side wall and an outwardly projecting flange which encircles the side wall at its wider end.
  • the capsule is filled through its wider end and then closed by a foil disc that is adhered to the flange.
  • the extraction machine which is used with these capsules comprises a structure for positioning the capsule in a cavity of the machine.
  • the longitudinal axis of the capsule extends horizontally and the flange lies in a vertical plane.
  • a cylindrical pressing sleeve of the machine, in use, bears on that surface of the flange which faces towards the smaller end of the capsule.
  • the sleeve presses the foil against a profiled back plate.
  • a blade penetrates the capsule through the base wall as the sleeve moves forward to press on the flange, allowing hot water to enter the capsule from the sleeve.
  • Water is injected into the capsule at a pressure of, for example, 19 Bar.
  • the foil has supported areas which are against raised zones of the back plate and other areas which are unsupported as they span across depressions in the back plate. Water pressure inside the capsule acting on these unsupported areas causes them to burst permitting the extracted beverage to flow out of the capsule through the holes which have been formed in the foil.
  • e is a water tight seal between the leading end of the pressing sleeve of the extraction machine and the capsule. If this seal is inadequate, water flows between the leading end of the sleeve and the flange. This can result in the pressure build up required to burst the foil not occurring which means that extraction fails. It can also result in the volume of beverage produced being reduced as water by-passes the capsule and flows into the trip tray.
  • US 7,993,691 discloses in its fig. 2-4 embodiment an aluminum or plastic capsule body that comprises a radially outwardly protruding flange encircling a circumferential frusto-conical side wall at one end thereof.
  • a free lip is provided that extends from an outer edge of the flange and that is inclined outwards. The lip prolongs a clamping portion of the flange but is self not supposed to be clamped so as to be able to deflect freely under pressure.
  • the lip In a state wherein the capsule has the clamping portion of its flange clamped by a leading end of a bell shaped enclosing pressing sleeve of an extraction machine, the lip is biased against a corresponding inclined inner sealing surface of this pressing sleeve.
  • water coming from a water injector will be pressurized within an interstice between an exterior of the side wall of the capsule body and the pressing sleeve and will eventually arrive at the lip.
  • the lip will block the water flow as it is biased against the inclined inner sealing surface of the pressing sleeve. This blocking effect will lead to the pressure raising at an upstream-side of the lip which in turn will lead to the lip being pressed even stronger against the inclined inner sealing surface and thus to a sealing engagement which is stronger the higher the pressure at the sealing engagement.
  • the sealing effect of the lip at the outer edge of the flange leaves to be improved.
  • the lip finds itself at a vulnerable position at a largest diameter of the capsule, As soon as the lip gets damaged, for example during transport or storage, this immediately shall cause it to no longer be able to perform its aimed sealing function during extraction.
  • the water pressure only is able to have the lip in its entirety tilt around the clamping portion of the flange for obtaining its sealing engagement.
  • the flange even comprises a curved hinge-like transition between its clamping portion and the lip.
  • the lip needs to be dimensioned relative long in order to be able to have the water pressure push it strongly enough against the inclined inner sealing surface of the pressing sleeve. In fact it would even be desirable to make the lip longer to improve the sealing engagement.
  • Another disadvantage is that the sealing engagement of the lip inside and against the skirt may stand in the way of ejection of the capsule after the extraction has finished.
  • the present invention aims to overcome those disadvantages at least partly or to provide a usable alternative.
  • the capsule comprises a capsule body that comprises a side wall, a transverse base wall at a first end of the side wall, a radially outwardly protruding flange encircling the side wall at its second end, and a seal.
  • the seal is a flexible wiper seal encircling said side wall, having one end merging with the capsule body and flaring outwardly from the side wall and defining, with the side wall of the capsule, a first trough for receiving, in use, water under pressure during extraction, whereby the wiper seal merging with and flaring outwardly from the side wall is forced outwardly into contact with a pressing sleeve of an extraction machine.
  • the flexible wiper seal can emerge directly from a wall of the capsule body at a position that lies in between a bearing surface/clamping portion of the flange and the transverse base ; at a position that, in terms of a leakage water flowing direction that during extraction may arise along the exterior of the capsule, lies upstream of such a bearing surface/clamping portion of the radially outwardly projecting flange that also encircles the side wall.
  • This advantageously may result in a superb blocking sealing engagement with a pressing sleeve portion that lies upstream of aimed pressing portions of such a pressing sleeve that are destined to bear on/press against and thus clamp the bearing
  • the flexible wiper seal is now provided at a more protected position of the capsule, that is to say more closely to the side wall of the capsule and preferably also well within maximum cross-sectional dimensions of the capsule that mostly are determined by the radially outwardly protruding flange.
  • the flange as it were can form a sort of bumper to protect the wiper seal. All this may help to make the capsule more economic and easier to manufacture.
  • the capsule can be used with all kinds of pressing sleeves.
  • a pressing sleeve For the blocking sealing engagement to be able to properly function, it no longer matters how the front end of a pressing sleeve is shaped/profiled and whether or not such a pressing sleeve comprises some kind of special skirt around its front end or not. Also it no longer matters whether or not the front end of the pressing sleeve comprises flow paths in between its pressing portions, like castellations, that in the prior art were required for the free lip at the edge of the flange to be able to operate as a seal.
  • the flexible wiper seal according to the invention already blocks any exterior leakage water before it is able to reach the bearing surface/clamping portion of the flange of the capsule at all. This also gives more design freedom for the bearing surface/clamping portion of the flange of the capsule itself.
  • a thickness of the flexible wiper seal may decrease from its one end where it merges with the capsule towards a free edge at the flaring outwardly other end of the wiper seal.
  • the free end portion of the wiper seal can be dimensioned relative short while already being able to have any water pressure push it strongly into sealing engagement with an inner surface of the pressing sleeve that gets to lie directly opposite the circumferential side wall of the capsule.
  • a radially inwardly facing surface of the flexible wiper seal can be frustoconical in shape, with a smaller diameter end of the frustoconical radially inwardly facing surface of the flexible wiper seal gradually merging with the capsule, and the rest of that frustoconical radially inwardly facing surface of the flexible wiper seal flaring outwardly from its smaller diameter end.
  • This specific shaping has the advantage that it makes the capsule body easier to (de-)mould and that it enhances its ability to be quickly and reliably be pushed in sealing engagement with a respective inner surface of the pressing sleeve, even when all kinds of structures and/or profiles have been provided in this inner surface of the pressing sleeve, like an alternating set of projections and indentations, for example bulges and notches.
  • a radially inwardly facing surface of the flexible wiper seal may intersect with a radially outwardly facing surface of the flexible wiper at the free edge of the flexible wiper seal. This gives the flexible wiper seal a sharp edge, which may further help to enhance its sealing abilities with all kinds of profiles.
  • the wiper seal may have one end merging with the side wall of the capsule body and flaring outwardly from the side wall towards one of its ends, particularly that end where an injection of water takes place during extraction.
  • This is practicable and economic to manufacture, and may help to prevent the flexible free end of the wiper to accidentally flip over during its wiping/sliding placement inside the pressing sleeve, that is to say that suddenly starting to flare outwardly towards the end of the side wall where any leakage water also tries to flow towards.
  • the side-wall-emerging wiper seal can be provided to encircle/circumvent the circumferential side wall at any height position (seen in the axial direction), that is to say anywhere between its first and second ends.
  • the wiper seal is provided close to or even directly adjacent the flange, because there it can be better protected against damaging by the protruding flange, and there the capsule gets more accurately centred relative to the pressing sleeve, particularly owing to a cooperation between pressing portions of the pressing sleeve and a bearing surface/clamping portion of the flange.
  • the flexible wiper seal can be provided at an edge zone of a thicker part of the side wall that lies between the first trough and the flange and that is thicker than an upstream remainder of the side wall.
  • the first through then can be a groove, in particular a V-shaped groove, that is provided in this edge zone of the thicker part of the side wall.
  • a radially outer surface of the flexible wiper seal then may form a continuation of the radially outer surface of the thicker part of the side wall.
  • This radially outer surface of the flexible wiper seal then preferably even may get to have a same axial or frustoconical shape as the thicker part of the side wall, making that portion of the capsule body with its integrated wiper seal design easy to (de-)mould.
  • the flange can be formed with a rim or rib which projects from the flange in the direction towards the first end, and wherein there is a second circumferentially extending trough delimited by the flange and the rim or rib.
  • the rim or rib then may help to increase the strength of the flange.
  • the second trough then can be designed to take in a front end of a pressing sleeve. This may help to properly position the capsule relative to such a pressing sleeve just before pressing portions at the front end of the pressing sleeve start to firmly clamp a clamping portion of the flange.
  • the rim or rib may form a crushable sealing zone, in particular by a radially inner flank of the rim or rib intersecting a radially outer flank at an acute angle, wherein the second trough is designed to take in a front end of a pressing sleeve while having the crushable sealing zone of the rim or rib crushed by this front end of such a pressing sleeve.
  • the flexible wiper seal may be encircling the side wall while reaching with is free outer edge to a height in the axial direction that is less than 2 mm, in particular less than 1 mm, above the bearing surface/clamping portion of the flange, and/or that is not more than 1 mm higher, in particular less than 0.5 mm higher than the
  • a capsule for containing a substance from which a beverage can be produced comprising a frustoconical side wall, a transverse base wall at the smaller diameter end of the side wall and a radially outwardly protruding flange encircling the side wall at its larger diameter, there being a flexible wiper seal of frustoconical form encircling said side wall, the smaller diameter end of the seal merging with the side wall and the seal flaring outwardly from its smaller diameter end towards the smaller diameter end of the capsule and defining, with side wall of the capsule, a trough for receiving, in use, water under pressure during extraction whereby the seal is forced outwardly into contact with the pressing sleeve.
  • the thickness of the seal preferably may decrease from its smaller diameter end where it merges with side wall towards its wider end.
  • the radially inwardly facing surface of the seal and the radially outwardly facing surface of the seal may both preferably be frustoconical in shape and intersect at the free edge of the seal.
  • the capsule can preferably be moulded using compostable or biodegradable synthetic plastics material.
  • the preferred plastic is one which softens when heated by the extraction water, this making the thin frustoconical wiper seal more flexible and enhancing its sealing contact with the pressing sleeve.
  • poly-lactic acid (PLA) could be used as material for the capsule body.
  • a beverage extraction system comprising a capsule as defined above and an extraction machine having a pressing sleeve for bearing on and sealing with the capsule, a spike for penetrating the capsule, in particular for penetrating the base wall of the capsule, and a pump for forcing heated water into the capsule.
  • a portion of an inner surface of the pressing sleeve that is destined to have the flexible wiper seal lying in sealing engagement against it after placing of the capsule inside the pressing sleeve may be provided with a profile, in particular a profile of alternating sets of projections and indentations, like bulges and notches.
  • the flexible wiper seal in particular with a free end of the wiper seal becoming thinner towards its free outer edge, then is well able to get elastically deformed/flexed/compressed such that it gets to lie sealing all around along and against such a profile inside the pressing sleeve, in particular while having its free outer edge extend sealing along any projections and into any indentations thereof.
  • Figure 1 is a side elevation of a capsule in accordance with the present invention.
  • Figure 2 is a diametrical section through the capsule of Figure 1 ;
  • Figure 3 shows, to a large scale, the configuration of the capsule’s flange
  • Figure 4 illustrate the relationship between the capsule and the capsule pressing sleeve of an extraction machine just before sealing between the capsule and the sleeve occurs
  • Figure 5 illustrates, to a larger scale, the relationship between the pressing sleeve and the flange of the capsule immediately before sealing takes place;
  • Figure 6 is a figure similar to Figure 5 and showing the relationship between the sleeve and the capsule after sealing has occurred;
  • Figure 7 shows a cross-sectional perspective view of a front end of a variant embodiment of a pressing sleeve
  • Figure 8 and 9 show a cross-sectional view and enlarged partial view of a variant
  • Figure 12 and 13 show the view of Figure 11 during a second and third stage
  • Figure 14 shows a partially diametrically cut-open perspective view of the third stage of Figure 13.
  • the capsule 10 illustrated comprises a frustoconical side wall 12, a transverse base wall 14 at the smaller diameter end of the capsule and a radially outwardly extending flange 16 which encircles the larger diameter end of the side wall 12.
  • the flange 16 and the adjacent part of the side wall 12 are shown in radial section in Figure 3.
  • the flange 16 has a peripheral rim 18 which inhibits flexing of the flange 16 whilst coffee is being extracted.
  • the flange is formed with a rib 22 which projects from the flange 16 in the direction towards the smaller diameter end of the capsule.
  • the rib 22 has a radially outer flank 24 which is conical and is skew to the surface of the flange 16 from which the rib 22 projects.
  • the radially inner flank of the rib 22 is in three distinct parts designated 26, 28 and 30.
  • the flank part 30 intersects the flank 24 at an acute angle to form a crushable sealing zone.
  • the wall 12 has an outer surface 34 which extends from the transverse base wall 14 towards the flange 16.
  • the part of the surface 34 adjacent the flange 16 forms the inner bounding surface of a V-shaped groove 36 which encircles the capsule wall 12.
  • the outer surface of the groove 36 is constituted by the radially inner surface of a V-section wiper seal designated 40.
  • the part of the wall 12 between the groove 36 and the flange 16 is thicker than the remainder of the wall 12. This forms a zone of the wall 12 from the upper edge of which (as viewed in Figure 3) the wiper seal projects towards the smaller apsule.
  • the radially outer surface of the thicker part of the wall 12 and the radially outer surface of the seal 40 together form the radially inner boundary of the trough 32.
  • the radially inner surface of the wiper seal 40 constitutes the radially outer surface of the groove 36.
  • FIG. 5 Part of the leading end of pressing sleeve P of the extraction machine is shown in Figures 5 and 6.
  • the front end of the sleeve is formed with an axial bulge X which extends around the pressing sleeve (see Figures 5 and 6).
  • the bulge X has many radially extending shallow notches in it.
  • the trough 32 defined between wall 12 and the wiper seal 40 on the one hand and the rib 22 substantially matches the shape of the forward bulge of the pressing sleeve.
  • the bulge is shown fully entered into the trough in Figure 6, the radially outer flank of the bulge having contacted and then crushed the rib 22.
  • the radially inner surface S of the pressing sleeve substantially matches the configuration of the surface 34 of the capsule.
  • the inner surface of the part of the sleeve P which bounds the forward bulge is of greater diameter than the wiper seal 40 and slides past it. As the sleeve P advances its effective inside diameter decreases until it contacts the wiper seal 40 pushing it radially inwardly.
  • the crushed rib 24 forms a second seal which further inhibits water flow between the leading end of the pressing sleeve and the capsule.
  • the pressing sleeve P here comprises a frusto-conical inner wall that inside the front end X of the pressing sleeve P is provided with a profile of alternating bulges B and notches N.
  • the bulges B extend in a substantially axial direction AD while decreasing their width.
  • the notches N extend in a substantially axial direction AD while increasing their width.
  • the bulges B also continue to extend around the curved corner of the front end X and there form pressing portions PP that face towards the flange 16 to be clamped. In between those pressing portions PP flow paths are provided by the notches N also continuing to extend around the curved corner of the front end X.
  • the wiper seal 40 here is provided merging with the circumferential frusto-conical sidewall 12 at its transition with the flange 16. Furthermore the wiper seal 40 has a convexly curved radially inwardly facing surface. A radially inward surface of the wiper seal 40 flares outwardly under an angle relative to the radial direction RD of between 60-80 degrees, in particular approximately 75 degrees. A height Hws of the wiper seal 40 in the axial direction AD is only slightly higher, here less than 0,1 mm, than a height Hfr of an upwardly projecting rim 18 at the free edge zone of the flange 16.
  • FIG 12 a second stage is shown in which the capsule 10 has further entered the pressing sleeve P. Owing to the decreasing cross-sectional shape of the frusto-conical inner wall of the front end X of the pressing sleeve P, the free edge of the wiper seal 40 there has just started touching against the bulges B inside the frusto-conical inner wall of the front end X of the pressing sleeve P.
  • FIG 13-14 a third stage is shown in which the capsule 10 has fully entered the pressing sleeve P.
  • the front end X there presses against a clamping portion of the flange 16.
  • the wiper seal 40 there has just finished its wiping movement over and along the bulges B and notches N inside the front end X of the pressing sleeve P.
  • the free edge of the wiper seal 40 has been forced by the decreasing cross-sectional shape of ;r wall of the front end X of the pressing sleeve P to deform complementary to the shapes of the bulges B and into the notches N.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatus For Making Beverages (AREA)

Abstract

La présente invention concerne une capsule (10) pour contenir une substance à partir de laquelle une boisson peut être produite, comprenant un corps de capsule avec une paroi latérale (12), une paroi de base transversale (14) à une première extrémité de la paroi latérale (12), une collerette faisant saillie radialement vers l'extérieur (16) encerclant la paroi latérale (12) à sa seconde extrémité, et un joint. Le joint est un joint racleur souple (40) encerclant ladite paroi latérale (12), ayant une extrémité fusionnant avec le corps de capsule et s'évasant vers l'extérieur depuis la paroi latérale (12) et définissant, avec la paroi latérale (12) de la capsule, une première gouttière (36) pour recevoir, durant l'utilisation, de l'eau sous pression durant l'extraction, moyennant quoi le joint racleur souple (40) est forcé vers l'extérieur en contact avec un manchon de compression d'une machine d'extraction.
PCT/NL2019/050453 2018-07-16 2019-07-16 Capsules contenant une substance à partir desquelles une boisson peut être produite ayant un joint racleur fusionnant avec la paroi latérale WO2020017964A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201804721 2018-07-16
ZA2018/04721 2018-07-16

Publications (1)

Publication Number Publication Date
WO2020017964A1 true WO2020017964A1 (fr) 2020-01-23

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PCT/NL2019/050453 WO2020017964A1 (fr) 2018-07-16 2019-07-16 Capsules contenant une substance à partir desquelles une boisson peut être produite ayant un joint racleur fusionnant avec la paroi latérale

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110185910A1 (en) * 2009-08-05 2011-08-04 Nestec S.A. Capsule with relief-shaped sealing member
US7993691B2 (en) 2004-10-25 2011-08-09 Nestec S.A. Capsule with sealing means and its use in producing a beverage
ITMI20110923A1 (it) * 2011-05-24 2012-11-25 Brasilia Spa Capsula monouso presentante un vano di contenimento di una essenza aromatica per la produzione di un infuso alimentare
WO2013164669A1 (fr) * 2012-05-02 2013-11-07 Russon Holdings Limited Capsule destinée à être utilisée dans des machines d'extraction de café
WO2014012779A2 (fr) * 2012-07-16 2014-01-23 Tuttoespresso S.R.L. Capsule avec élément d'étanchéité amélioré
WO2015075584A1 (fr) * 2013-11-08 2015-05-28 Caffitaly System S.P.A. Capsule et système de fabrication de boissons
WO2015082982A1 (fr) * 2013-12-03 2015-06-11 Biserkon Holdings Ltd. Capsule et dispositif pour la préparation de boissons et procédé de production d'une capsule
US9309042B2 (en) * 2013-06-14 2016-04-12 Nordson Corporation Liquid dispensing syringe and method for reducing piston bounce
WO2018211147A1 (fr) * 2017-05-19 2018-11-22 K-Fee System Gmbh Dosette sous forme de capsule servant à préparer une boisson dans une machine de production de boisson et procédé servant à fabriquer une dosette sous forme de capsule

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7993691B2 (en) 2004-10-25 2011-08-09 Nestec S.A. Capsule with sealing means and its use in producing a beverage
US20110185910A1 (en) * 2009-08-05 2011-08-04 Nestec S.A. Capsule with relief-shaped sealing member
ITMI20110923A1 (it) * 2011-05-24 2012-11-25 Brasilia Spa Capsula monouso presentante un vano di contenimento di una essenza aromatica per la produzione di un infuso alimentare
WO2013164669A1 (fr) * 2012-05-02 2013-11-07 Russon Holdings Limited Capsule destinée à être utilisée dans des machines d'extraction de café
WO2014012779A2 (fr) * 2012-07-16 2014-01-23 Tuttoespresso S.R.L. Capsule avec élément d'étanchéité amélioré
US9309042B2 (en) * 2013-06-14 2016-04-12 Nordson Corporation Liquid dispensing syringe and method for reducing piston bounce
WO2015075584A1 (fr) * 2013-11-08 2015-05-28 Caffitaly System S.P.A. Capsule et système de fabrication de boissons
WO2015082982A1 (fr) * 2013-12-03 2015-06-11 Biserkon Holdings Ltd. Capsule et dispositif pour la préparation de boissons et procédé de production d'une capsule
WO2018211147A1 (fr) * 2017-05-19 2018-11-22 K-Fee System Gmbh Dosette sous forme de capsule servant à préparer une boisson dans une machine de production de boisson et procédé servant à fabriquer une dosette sous forme de capsule

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