EP0602203B1 - Sealed flexible bag and method for making same - Google Patents

Sealed flexible bag and method for making same Download PDF

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Publication number
EP0602203B1
EP0602203B1 EP19930912540 EP93912540A EP0602203B1 EP 0602203 B1 EP0602203 B1 EP 0602203B1 EP 19930912540 EP19930912540 EP 19930912540 EP 93912540 A EP93912540 A EP 93912540A EP 0602203 B1 EP0602203 B1 EP 0602203B1
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EP
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Grant
Patent type
Prior art keywords
sachet
characterized
sheets
substance
compacted
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
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EP19930912540
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German (de)
French (fr)
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EP0602203A1 (en )
Inventor
Olivier Fond
Jean-Pierre Pleisch
Roland Rossier
Jacques Schaeffer
Alfred Yoakim
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Societe des Produits Nestle SA
Nestle SA
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Societe des Produits Nestle SA
Nestle SA
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D85/00Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/8043Packages adapted to allow liquid to pass through the contents
    • B65D85/8046Pods, i.e. closed containers made only of filter paper or similar material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D85/00Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/8043Packages adapted to allow liquid to pass through the contents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D65/00Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38Packaging materials of special type or form
    • B65D65/46Applications of disintegrable, dissolvable or edible materials
    • B65D65/466Bio- or photodegradable packaging materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D85/00Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/36Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for bakery products, e.g. biscuits

Abstract

A sealed flexible bag (1) designed for pressure extraction and containing at least one powdered substance for preparing a beverage. The bag consists of two identical, round, oval or polygonal flexible sheets (2, 3) defining therebetween a space for said powdered substance (5) and being sealed around their periphery (4) such that said bag is substantially symmetrical relative to its sealing plane. The material used for the sheets is impermeable to oxygen and steam and said bag may be used as in the provided extraction device.

Description

  • L'invention concerne un sachet souple fermé, prévu pour être extrait sous pression, contenant au moins une substance pulvérulente pour la préparation d'une boisson. The invention relates to a closed flexible sachet provided for extraction under pressure, containing at least one pulverulent substance for the preparation of a beverage. L'invention concerne en outre le procédé de fabrication dudit sachet. The invention further relates to the process for manufacturing said bag.
  • L'utilisation de portions prédosées et préemballées de café moulu pour la préparation de café type espresso présente l'avantage de faciliter les opérations de préparation du café tout en garantissant une relative constance de qualité du produit. The use of pre-measured servings and pre-packaged ground coffee for preparing espresso coffee kind has the advantage of facilitating brewing operations while ensuring relative stability of product quality.
  • Ces portions se présentent actuellement sous trois formes principales. These portions now present in three main forms. Selon une première version, les portions, décrites dans les documents CH-A-636311, US-A-5012629 et EP-A-0272432, sont constituées de deux feuilles en papier filtre soudées sur leur périphérie et remplies de café moulu. In a first version, the portions described in the documents CH-A-636 311, US-A-5012629 and EP-A-0272432, consist of two paper sheets filter sealed over their periphery and filled with ground coffee. Cette solution présente le désavantage de devoir suremballer de manière étanche afin d'éviter toute - oxydation du produit pendant le stockage, ce qui constitue un coût supérieur et une opération supplémentaire du consommateur pour obtenir l'extrait de café désiré. This solution has the tightly suremballer duty drawback to avoid - product oxidation during storage, which is a higher cost and a further operation of the consumer to get the desired coffee extract.
  • Le même type de solution est envisagé dans le document CH-A-495,138 concernant un emballage contenant du café rôti et moulu avec un premier emballage en papier filtre et un suremballage. The same type of solution is envisaged in the document CH-A-495.138 for a package containing roast and ground coffee with a first package of filter paper and an overwrap. Le document US-A-3,607,299 concerne un procédé de fabrication de capsule fabriqué avec du non-tissé. US-A-3,607,299 relates to a capsule manufacturing process made with nonwoven fabric.
  • Selon une seconde version, décrite dans la demande de brevet WO-A-92/07775, la portion est constituée d'une capsule étanche s'ouvrant dans son dispositif d'extraction sous l'effet de l'introduction du fluide d'extraction après déformation puis successivement perforation par des pointes. According to a second version, disclosed in patent application WO-A-92/07775, the portion is comprised of a sealed capsule opening into its extraction device under the effect of the introduction of the extraction fluid after deformation and successively perforation spikes.
  • Cette capsule, constituée d'une enveloppe étanche formant une paroi latérale ainsi que deux parois dont l'une constitue le fond de la cartouche et l'autre ferme l'extrémité opposée de la cartouche, présente l'inconvénient d'employer différents matériaux d'emballage, certains suffisamment épais pour leur conférer une semi-rigidité et ne peut être utilisée que dans un seul sens c'est-à-dire avec la face operculée vers le haut avec un dispositif d'extraction parfaitement adapté et à la capsule et à sa disposition. This capsule comprises a sealed envelope forming a lateral wall and two walls of which one constitutes the bottom of the cartridge and the other closes the opposite end of the cartridge, has the drawback of using different materials packaging, some thick enough to impart a semi-rigid and can be used only in one direction that is to say with the front operculated up with an extraction device and perfectly adapted to the capsule and at its disposal.
  • Selon une troisième version, le document US-A-3607297 propose des sachets pour la préparation de boisson sous forme de bande présentant des cavités de remplissage et un opercule plat à la face supérieure. According to a third version of the document US-A-3607297 proposes bags for web-like beverage preparation having filling cavities and a flat lid to the upper face. Selon l'auteur, ces sachets sont destinés à un écoulement par gravité et doivent être perforés sur les deux faces par des plaques dentées dont l'une est poussée par un ressort. According to the author, these bags are intended for gravity flow and must be perforated on both sides by toothed plates one of which is pushed by a spring.
  • Le but de la présente invention est de proposer un sachet souple fermé contenant du café torréfié et moulu et destiné à être extrait sous pression pour la préparation d'une boisson, ledit sachet ne nécessitant aucun suremballage et le système d'extraction étant seulement adapté au sachet et non à la disposition dudit sachet, car il est parfaitement apte à être extrait dans un sens ou dans l'autre. The object of the present invention is to provide a closed flexible bag containing roasted and ground coffee to be extracted under pressure for the preparation of a beverage, said bag requiring no overpack and the extraction system being only adapted to bag and not to the provision of said bag because it is perfectly able to be extracted in one direction or the other.
  • La présente invention a également pour but de limiter au minimum la quantité de matière nécessaire à l'emballage d'une portion. The present invention also aims to minimize the amount of material required for packaging a portion.
  • L'invention concerne un sachet souple sous forme de portion individuelle constitué de deux feuilles minces et identiques, de forme circulaire, ovale ou polygonale, ménageant entre elles un espace pour la substance pulvérulente et soudées sur leur périphérie de manière à ce que ledit sachet soit sensiblement symétrique par rapport à son plan de soudage. A flexible sachet in the form of individual portion consisting of two thin sheets and identical, circular, oval or polygonal, leaving between them a space for the pulverulent substance and sealed over their periphery so that the said sachet is substantially symmetrical relative to its welding plane. Le matériau utilisé pour les feuilles souples est imperméable à l'oxygène et à la vapeur d'eau. The material used for the flexible sheets is impermeable to oxygen and to water vapor. Le sachet est ouvert sous l'effet de la seule montée en pression lors de l'injection du fluide d'extraction. The sachet is opened under the effect of the only pressure increase upon injection of the extraction fluid.
  • Le sachet selon l'invention est destiné à être utilisé tel quel dans le dispositif d'extraction prévu. The sachet according to the invention is intended to be used as such in the provided extraction device.
  • Comme le sachet selon l'invention est symétrique, l'utilisateur peut l'introduire dans le système d'extraction sans prêter attention au sens d'introduction. As the bag according to the invention is symmetrical, the user can be introduced into the extraction system without paying attention to the inserting direction. D'autre part, le sachet est directement prêt à l'emploi et ne nécessite aucune préparation préalable avant de le mettre dans le système d'extraction. On the other hand, the bag is directly ready for use and requires no prior preparation before putting it in the extraction system.
  • En variante, pour des raisons propres à la fabrication, les deux feuilles souples peuvent toutefois être légèrement différentes l'une de l'autre en forme et/ou en matière, sans pour autant nuire à la symétrie recherchée pour l'extraction. Alternatively, for clean manufacturing reasons, the two flexible sheets may however be slightly different from each other in shape and / or material without harming the desired symmetry for extraction.
  • La méthode et le dispositif utilisés pour l'extraction des sachets selon l'invention peuvent être avantageusement du type faisant l'objet de la demande de brevet EP No 92'107'548.7 ou EP 92'112'364. The method and device used for the extraction of sachets according to the invention may advantageously be of the type forming the subject of patent application No. EP or EP 92'107'548.7 92'112'364. La face supérieure du sachet est d'abord ouverte par un ou plusieurs éléments perforants prévus sous la face supérieure dudit dispositif et la face inférieure est ouverte par ruptures localisées consécutives à sa déformation contre les éléments en relief et en creux ni perforants ni tranchants disposés sur la face inférieure dudit dispositif sous l'effet de la seule montée en pression lors de l'injection du fluide d'extraction. The upper surface of the sachet is first opened by one or more piercing elements provided in the upper face of said device and the lower face is opened by localized ruptures, its deformation against the relief elements and recessed or perforating or cutting edges arranged on the underside of said device under the effect of the only pressure increase upon injection of the extraction fluid. Il n'y a donc pas lieu d'ouvrir préalablement le sachet ou de lui retirer une fraction de matière avant son utilisation. There is no need to first open the bag or to withdraw a fraction of material prior to use. Après usage, ledit sachet peut être retiré facilement avec un minimum de déchet. After use, the sachet can be removed easily with a minimum of waste.
  • Néanmoins, au cas où l'on ne dispose que d'un dispositif d'extraction partiel par rapport à celui décrit ci-dessus, c'est à dire ne comprenant pas les moyens pour ouvrir l'une ou l'autre des deux faces, par exemple un dispositif tel que celui des machines espresso conventionnelles, on peut réaliser, juste avant la mise en place dans ce dispositif d'extraction partiel, dans l'une et/ou l'autre face du sachet des ouvertures, permettant de laisser passer le fluide d'extraction. However, in case there is only a partial extraction device with respect to that described above, i.e. not comprising the means for opening one or the other of the two faces , for example a device such as that of conventional espresso machine, it is possible, immediately before the insertion into this partial extraction device, in one and / or the other face of the bag openings, to leave pass fluid extraction.
  • Le diamètre intérieur du sachet se situe, de préférence entre 25 et 70 mm et la bordure soudée a une largeur de 3 à 15 mm. The inner diameter of the sachet is preferably between 25 and 70 mm and the sealed edge has a width of 3 to 15 mm. Une fois rempli, le sachet présente une épaisseur en son centre, de préférence, entre 5 et 20 mm. Once filled, the sachet has a thickness at its center, preferably between 5 and 20 mm. La dose de substance pulvérulente contenue peut varier entre 5 et 20 g, selon son utilisation. Contained the dose of powdered substance can vary between 5 and 20 g, according to its use.
  • Le sachet est rempli d'une substance pulvérulente pour la préparation d'une boisson. The pouch is filled with a powdery substance for the preparation of a beverage. Cette substance est de préférence du café torréfié et moulu, mais peut aussi être du thé, du café soluble, un mélange de café moulu et de café soluble, un produit chocolaté ou toute autre substance comestible déshydratée. This substance is preferably roasted and ground coffee, but may also be tea, soluble coffee, a mixture of ground coffee and soluble coffee, a chocolate product or any other dehydrated edible substance.
  • La forme extérieure du sachet est de préférence circulaire, mais peut aussi être ovale ou polygonale de 4 à 10 cotés à bords éventuellement arrondis, ou peut être une combinaison de ces trois éléments. The outer shape of the bag is preferably circular, but can also be oval or polygonal from 4 to 10 climbs optionally rounded edges, or may be a combination of these three elements. Sa section est de préférence sensiblement hexagonale aplatie, mais peut aussi présenter une forme lenticulaire. Its section is preferably substantially flattened hexagonal, but may also have a lenticular shape.
  • Dans une variante d'éxécution, non représentée ci-après, le sachet est muni d'au moins une languette latérale facilitant sa mise en place. In an alternative embodiment, not shown below, the bag is provided with at least one lateral tab facilitating its implementation. Cette languette est simplement ménagée lors du découpage du sachet. This tab is only provided when cutting the bag.
  • Selon une première configuration, le sachet est constitué de deux feuilles soudées sur leur périphérie, la soudure étant réalisée en face plane. In a first configuration, the bag consists of two sheets sealed on their periphery, the weld being made planar face.
  • Dans une première variante de fabrication, les deux feuilles auront été préalablement étirées (déformation dans la zone plastique) afin d'éviter tout pli aléatoire dû à la mise en volume d'une matière à l'origine plane, soit par l'intermédiaire de la compression dans un ensemble matrice-piston, soit par l'intermédiaire de la mise sous pression par un gaz des faces intérieures et/ou éventuellement d'une aspiration des faces extérieures dans un moule de forme adéquate à température contrôlée où les feuilles sont maintenues planes à leur périphérie. In a first production variant, the two sheets have been previously stretched (strain in the plastic zone) to prevent random folds due to the erecting of a plane at the origin material, either via compression in a die assembly piston, or by means of pressurization by a gas of the inner sides and / or possibly a suction of the outer faces in a suitably shaped mold at a controlled temperature where the sheets are maintained plane at their peripheries.
  • Dans une seconde variante, la matière est simplement repoussée comme dans les deux exemples précédents, mais dans ce cas elle n'est pas retenue sur sa périphérie et présentera alors des plis, plus ou moins aléatoires résultant de la mise en volume d'une surface plane. In a second variant, the material is simply pushed back as in the two previous examples, but in this case it is not retained on its periphery and then present the folds, more or less random resulting from the volume of a surface plane.
  • Selon une deuxième configuration, les deux feuilles sont préformées d'une manière systématique et contrôlée et la soudure est effectuée, après remplissage de la substance pulvérulente, selon un dispositif en trois dimensions. In a second configuration, the two sheets are preformed in a systematic and controlled manner and the welding is performed, after filling the powdery substance according to a scheme in three dimensions. En effet, en mettant en volume une surface plane sans étirement ni élastique ni plastique, on modifie le diamètre apparent de la matière par rapport à son diamètre réel. In fact, by setting a volume planar surface without stretching or elastic or plastic, modifying the apparent diameter of the material with respect to its actual diameter. Cet excès de matière doit être compensé par une forme géométrique adéquate afin d'éviter tout pli aléatoire. This excess material must be compensated by adequate geometry to avoid random fold.
  • Pour parvenir à ce but, le moulage, systématique et contrôlé s'effectue dans un moule où, en tout endroit, le principe de l'égalité du diamètre apparent déployé et du diamètre réel est assuré. To achieve this goal, casting, systematic and controlled is made in a mold where, in any place, the principle of equality of the apparent diameter deployed and the actual diameter is assured. Ceci est obtenu dans le moule par la création d'ondulations plus ou moins hautes et s'évasant vers l'extérieur. This is achieved in the mold by creation of undulations more or less high and flaring outwardly. Dans la partie centrale des feuilles du sachet, la déformation est inexistante ou réduite car il s'agit du plan de référence. In the central part of the leaves of the pouch, the deformation is non-existent or reduced because it is the reference plane. Par contre, en évoluant vers le diamètre extérieur, ces ondulations augmentent en hauteur et s'évasent. By cons, moving towards the outer diameter, the waves increase in height and flare. L'ondulation est maximale au niveau de la bordure de soudage. The ripple is maximum at the sealing edge. Cette ondulation dépend du rapport entre le diamètre du sachet et la distance entre les plans de la zone de soudage et celui dans la zone centrale du sachet, c'est-à-dire la demi-profondeur du sachet. This ripple depends on the ratio between the bag diameter and the distance between the planes of the welding zone and in the central zone of the bag, that is to say the half-depth of the bag.
  • Les deux feuilles du sachet subissent une mise en volume équivalente et sont positionnées lors de la soudure, après remplissage, de manière à se superposer parfaitement l'une dans l'autre. The two sheets of the bag undergo an equivalent volume setting and are positioned at the welding after filling so as to be superimposed perfectly into one another. La zone de soudage des deux feuilles se présente donc sous la forme d'une bande ondulée circulaire. The two sheets welding area is therefore in the form of a circular corrugated strip.
  • Ce moulage des feuilles est assuré, soit par l'intermédiaire de la compression dans un ensemble matrice-piston, soit par l'intermédiaire de la mise sous pression par un gaz des faces intérieures et/ou d'une aspiration des faces extérieures. This molding of the sheets is provided either by means of compression in a die assembly piston, or by means of pressurization by a gas of the inner sides and / or suction of the outer faces. Dans les deux cas le moule présente le relief désiré. In both cases, the mold has the desired relief.
  • Selon une troisième configuration, le sachet peut présenter des soufflets, sur un ou plusieurs côtés. According to a third configuration, the bag can have bellows, on one or more sides. Les soufflets, issus d'un pliage préalable au soudage des feuilles, permettent de donner un volume défini à l'ensemble tout en éliminant les plis aléatoires. Bellows, from a prefolding welding leaves, allow to provide a defined volume in the assembly while eliminating the random pleats. La fabrication des sachets selon ce dernier mode de réalisation peut s'effectuer de manière connue en soi. Producing the bags according to the latter embodiment can be carried out in manner known per se.
  • Les feuilles peuvent être faites de matériau souple tel que de l'aluminium d'une épaisseur de 5 à 40 µm ou du plastique tel que le PET. The sheets may be made of soft material such as aluminum with a thickness of 5 to 40 .mu.m or plastic such as PET. Préférentiellement, les feuilles seront constituées d'un matériau multicouches souple se prêtant au soudage par les méthodes usuelles tout en constituant une protection suffisante du produit face à l'oxygène et à la vapeur d'eau. Preferably, the sheets will consist of a flexible multilayer material of weldable by conventional methods while providing sufficient protection of the product against the oxygen and water vapor. La combinaison suivante des matériaux est recommandée: The following combination of materials is recommended:
    • couche extérieure: PET (normal, tissé ou non tissé), PE, PP, PA, PS ou papier outer layer: PET (normal, woven or non-woven), PE, PP, PA, PS or paper
    • couche centrale haute barrière: aluminium d'une épaisseur de 5 à 20 µm, EVOH, PVDC, PET, ou PVA high barrier core layer aluminum with a thickness of 5 to 20 microns, EVOH, PVDC, PET or PVA
    • couche intérieure: plastique, de préférence PE ou PP ou OPP. inner layer: plastic, preferably PE or PP or OPP. On peut envisager les combinaisons multicouches suivantes: PET-EVOH-PE ou PET-aluminium-PE. We can consider the following multi-layer combinations: PET-EVOH-PE or PET-aluminum-PE. L'utilisation de matériau biodégradable ou hydrosoluble est également possible en monocouche ou en combinaison avec d'autres matériaux. The use of biodegradable or water-soluble material is also possible in a monolayer or in combination with other materials.
  • Dans le cas où le PET est employé, il peut se présenter sous une seule couche combinant l'extérieure et la centrale, surtout s'il est chargé d'une couche d'oxyde de silicium ou s'il est métallisé. In the case where PET is used, it may be in a single layer combining the outer and the plant, especially if it is charged with a silicon oxide layer or if it is metallic.
  • Dans une variante d'éxécution, l'opération de thermosoudage est facilitée par l'insertion entre les deux feuilles d'une matière intermédiaire, telle une colle alimentaire ou une garniture de matériau plastique. In an alternative embodiment, the heat sealing operation is facilitated by inserting between the two sheets of an intermediate material, such as a food-grade adhesive or a plastic liner. Cette matière peut alors former une surépaisseur mise à profit pour réaliser une parfaite étanchéité lors de l'extraction. This material can then form a thickening exploited to achieve a perfect seal during extraction.
  • Le sachet selon l'invention contient préférentiellement une substance compactée, se présentant sous forme d'un ou plusieurs morceaux, le taux de compactage étant tel qu'on a une réduction de volume par rapport à la substance non compactée compris entre 10 et 60%. The sachet according to the invention preferably contains a compacted substance, in the form of one or several pieces, the degree of compaction being such that a volume reduction compared to the uncompacted substance between 10 and 60% . Ce compactage est réalisé de manière à ce que l'espace libre entre les deux feuilles souples et ladite substance représente entre 1 et 20% de l'espace total entre lesdites feuilles souples. This compacting is carried out so that the free space between the two flexible sheets and said substance represents between 1 and 20% of the total space between the said flexible sheets. Cet espace libre est nécessaire pour permettre au café, lors de l'extraction, de gonfler suffisamment pour assurer une bonne extraction. This free space is necessary to allow the coffee during extraction, to swell sufficiently to ensure good extraction.
  • La substance compactée présente en outre, sur au moins une de ses faces des empreintes formant canaux de circulation d'eau de forme appropriée (par exemple croix, cercle) permettant d'améliorer le prémouillage du sachet et son extraction. The compacted substance present in addition, on at least one side indentations forming channels for circulating water suitably shaped (e.g., cross, circle) to improve pre-wetting of the bag and its extraction. La forme de ces empreintes est choisie en relation avec le dispositif d'extraction utilisé. The shape of these footprints is selected in relation to the extraction apparatus used.
  • La matière compactée peut présenter en outre sur au moins une de ses faces une forme concave ou convexe permettant, si nécessaire, de modifier l'état de compactage lors de sa mise en place dans le dispositif d'extraction. The compacted material is further present on at least one side thereof a concave or convex shape enabling, if necessary, modify the compaction state upon its introduction into the extraction device.
  • Cette forme est adaptée à la disposition de la chambre d'extraction et peut être mise à profit pour assurer une bonne étanchéité du sachet dans la zone périphérique de l'injection, soit entre la face supérieure de la chambre d'extraction et la feuille supérieure du sachet. This shape is adapted to the provision of the extraction chamber and can be utilized to ensure a good seal of the sachet into the surrounding area of ​​the injection, between the upper face of the extraction chamber and the topsheet of the bag.
  • L'invention concerne en outre le procédé de fabrication du sachet décrit ci-dessus, dans lequel on déforme de manière symétrique par moulage ou par étirage deux feuilles souples imperméables à l'oxygène et à la vapeur d'eau, on dose la quantité de substance pulvérulente, on dépose ladite substance sur une des feuilles souples déformées et on soude les deux feuilles sur leur périphérie. The invention further relates to the pouch manufacturing method described above, wherein is deformed symmetrically by molding or by drawing two flexible sheets impermeable to oxygen and to water vapor, the amount of one dose powdery substance is deposited on a said substance of the deformed flexible sheets and welding the two sheets on their periphery.
  • La substance pulvérulente est usuellement compactée lors du processus de fabrication. The powdery substance is usually packed during the manufacturing process.
  • Selon un premier mode de réalisation, la substance peut être compactée postérieurement à son dosage et à sa dépose entre les feuilles du sachet. In a first embodiment, the substance can be compacted after its dosage and its removal between the sheets of the bag.
  • Selon un second mode préféré de réalisation, la substance est compactée puis dosée et déposée entre les feuilles du sachet. According to a second preferred embodiment, the substance is compacted and then metered and deposited between the sheets of the pouch. Selon la forme et la taille des morceaux de substance compactée, un ou plusieurs morceaux sont utilisés pour obtenir la dose désirée. Depending on the shape and size of the pieces of compacted substance, one or more pieces are used to achieve the desired dose.
  • Le compactage est réalisé de manière classique, soit par rouleaux, soit par un ensemble matrice-piston, les paramètres physico-chimiques tels que pression, température, taux d'humidité du café sont adaptés à la nature de la substance à compacter. Compaction is achieved in conventional manner, either by rollers or by a die assembly piston, the physico-chemical parameters such as pressure, temperature, humidity coffee are adapted to the nature of the substance to be compacted.
  • Selon un mode de réalisation particulier, la substance compactée peut être partiellement ou totalement décompactée après fermeture du sachet, par exemple par vibration ou par tout autre moyen mécanique connu. According to a particular embodiment, the compacted material may be partially or fully decompressed after closure of the bag, for instance by vibration or by any other known mechanical means.
  • Un nouveau compactage selon une pression et une forme appropriée peut encore être effectué après la fermeture du sachet. A new compacting apparatus as a pressure and a suitable shape may be further carried out after the closure of the bag.
  • Lorsque la substance pulvérulente est sujette à oxydation, les opérations de fabrication peuvent être réalisées sous protection d'un courant de gaz inerte exempt d'oxygène, par exemple sous azote ou CO2. When the powdery substance is subject to oxidation, manufacturing operations can be performed under the protection of a stream of inert gas free of oxygen, for example under nitrogen or CO2.
  • Certaines matières plastiques ont la propriété de reprendre sensiblement leur forme initiale après avoir été momentanément déformées. Some plastics have the property to substantially regain their original shape after being momentarily distorted. Le sachet selon l'invention met à profit cette propriété, conjointement à une configuration appropriée de son dispositif d'extraction. The sachet according to the invention takes advantage of this property, together with an appropriate configuration of the extraction device. Ainsi les lèvres des ouvertures constituées par les parties perforées du sachet se referment autour d'organes perforants effilés tels des aiguilles, assurant l'étanchéité souhaitée autour de cet organe pendant l'extraction. Thus the lips of the openings formed by the perforated portions of the bag are closed around perforating tapered members such as needles, ensuring the desired tightness around this body during extraction. Après l'extraction, cette même propriété limite efficacement le dégorgement du sachet lors de son dégagement, y compris sur les parties déchirées par le système d'extraction. After extraction, the same property effectively limits the disgorgement of the bag upon its release, including parts torn the extraction system.
  • La symétrie du sachet, tant en forme qu'en matériau, sa souplesse et la propriété relevée ci-dessus permettent de varier à volonté le mode et l'emplacement de l'introduction de l'eau et de l'extraction. The symmetry of the bag, both shape and material, its flexibility and property raised above allow to vary at will the mode and location of the introduction of water and extraction. L'un et l'autre peuvent par exemple être concentriques, sur la même face ou sur les faces opposées, l'objectif restant de faire parcourir à l'eau un chemin optimal. One and the other may be, for example concentric, on the same side or on opposite sides, the remaining objective to browse with water an optimal path.
  • La souplesse des parois du sachet est également mise à profit pour permettre, par sa déformation sans rupture dans le dispositif d'extraction, une reconfiguration du volume de café contenu. The flexibility of the bag walls is also harnessed to allow, by its deformation without rupture in the extraction device, a reconfiguration of the volume of coffee content. Cette déformation contrôlée a alors pour but une amélioration de la distribution de l'écoulement dans le lit de café et par conséquent de la qualité d'extraction. This controlled deformation is therefore to improved flow distribution in the bed of coffee, and therefore the quality of extraction.
  • Par ailleurs, compte tenu du mode d'extraction auquel il est destiné, le sachet est constitué d'une combinaison de matières choisie selon un critère supplémentaire de plasticité. Furthermore, taking into account the mode of extraction which it is intended, the pouch is formed of a combination of materials selected according to a further criterion of plasticity. La déformabilité par allongement de son matériau doit être suffisante pour permettre la mise en forme décrite ci-dessus, mais il doit également, sous l'effet de la pression du liquide et à l'endroit des reliefs du dispositif d'extraction, se rompre sous forme de petites déchirures sans que son allongement soit trop important. The deformability by extension of its material must be sufficient to allow the shaping described above, but must also, under the influence of the liquid pressure and location of the reliefs of the extraction device, rupture form small tears without its elongation is too important.
  • La suite de la description est faite en référence aux dessins donnés à titre d'exemples non limitatifs sur lesquels: The following description is with reference to the drawings given as non-limiting examples in which:
    • Fig. Fig. 1 est une représentation schématique en coupe du sachet selon l'invention, 1 is a schematic sectional sachet according to the invention,
    • Fig. Fig. 2 est une représentation schématique en coupe du sachet selon une seconde forme de réalisation, 2 is a schematic sectional view of the bag according to a second embodiment,
    • Fig. Fig. 3 est une perspective de la feuille moulée utilisée pour le sachet de la Fig. 3 is a perspective of the molded sheet used for the pouch of Fig. 2, 2
    • Fig. Fig. 4 est une vue en plan d'un sachet selon une troisième forme de réalisation, 4 is a plan view of a bag according to a third embodiment,
    • Fig. Fig. 5 est une représentation schématique en coupe selon la ligne AA' de la Fig 4, 5 is a schematic sectional view along the line AA 'of Fig 4,
    • Fig. Fig. 6 est une perspective d'une feuille du sachet, dans une quatrième forme de réalisation. 6 is a perspective view of a sheet of the sachet in a fourth embodiment.
    • Fig. Fig. 7 est une vue perspective du café compacté non emballé. 7 is a perspective view of compacted unpackaged coffee.
  • Le sachet (1) de forme circulaire comporte deux feuilles de matière souple (2) et (3) soudées sur leur périphérie (4) par thermoscellage et contenant du café torréfié moulu (5) compacté pour la préparation d'une boisson. The bag (1) comprises two circular sheets of flexible material (2) and (3) welded to the periphery (4) by heat sealing and containing ground roasted coffee (5) compacted to the preparation of a beverage. Le café compacté présente des faces concaves (35), la forme générale de sa section étant un octogone aplati, alors que celle du sachet est hexagonale. The compacted coffee has concave surfaces (35), the general shape of its section being a flattened octagon, while the pouch is hexagonal. Le flan cylindrique (38) de la galette a pour but d'éviter la présence indésirable de grains dans la zone de soudage. The cylindrical blank (38) of the wafer is intended to prevent the undesirable presence of grains in the weld zone.
  • Pour donner un exemple chiffré, on dispose d'un sachet ménageant un espace total entre les deux feuilles de 15 cm3, le volume du café compacté étant de 14 cm3 avec un taux de compactage de 30%. To give a numerical example, there is provided a pouch leaving a total gap between the two sheets of 15 cm3, the volume of the compacted coffee was 14 cm3 with a compaction rate of 30%.
  • Le sachet (10), de la Fig. The pouch (10) of Fig. 2 obtenu à partir de deux feuilles moulées (6, 7) présente des ondulations (8), (12) et (13) dont l'amplitude et la distance de l'une à l'autre augmentent depuis la face plane (11) vers le bord de soudage (9). 2 obtained from two molded sheets (6, 7) has undulations (8), (12) and (13) whose amplitude and the distance from one to the other increases from the planar face (11) to the welding edge (9). Dans cet exemple, la galette de café présente une seule face concave (35) et n'est pas exactement symétrique, mais cette différence n'est pas liée à la forme du sachet. In this example, the coffee wafer has a single concave surface (35) and is not exactly symmetrical, but this difference is not related to the shape of the bag.
  • La Fig. Fig. 3 montre bien une feuille moulée (7) avec un fond plat (11) et des ondulations de plus en plus accentuées au fur et à mesure qu'on se rapproche du bord extérieur. 3 shows a molded sheet (7) with a flat bottom (11) and undulations increasingly accentuated as one moves closer to the outer edge. Ces ondulations présentent des bosses (14) et des creux (15). These corrugations have bumps (14) and depressions (15).
  • Après avoir déposé le café torréfié et moulu sur le fond (11), on pose la feuille (6) de manière à avoir en regard les bosses de (6) face aux creux de (7) et inversément. After removing the roast and ground coffee on the bottom (11), the sheet is placed (6) so as to have opposite bumps (6) facing the hollow (7) and vice versa. On peut alors effectuer le thermoscellage. We can then carry out the sealing.
  • En référence aux Fig. Referring to Fig. 4 et 5, le sachet (18) est de forme carrée avec deux soufflets sur les côtés opposés. 4 and 5, the bag (18) is square-shaped with two gussets at opposite sides. Les deux feuilles (20) et (22) sont soudées le long des deux soufflets en (19, 23, 24, 25) et sur les bords (26, 27) où les deux feuilles sont simplement jointes. The two sheets (20) and (22) are welded along the two bellows (19, 23, 24, 25) and the edges (26, 27) where the two sheets are simply attached. Les soufflets permettent de donner un volume défini au sachet sans apparition de pli aléatoire. The bellows used to provide a defined volume to the bag without the occurrence of random folds.
  • La Fig. Fig. 6 montre une feuille (30) présentant des ondulations (31) sur le bord, mais aussi sur le fond (32). 6 shows a sheet (30) having corrugations (31) on the edge, but also on the bottom (32). La fabrication se fait de la même manière que pour le sachet de la Fig. The manufacturing is done in the same way as the bag of Fig. 2. 2.
  • La Fig. Fig. 7 montre la substance compactée seule (36). 7 shows only the compacted substance (36). Elle présente sur au moins une face des zones (37) de circulation d'eau sous forme de canaux permettant un prémouillage et une extraction uniforme. It has on at least one side zone (37) for circulating water in the form of channels for a pre-wetting and uniform extraction.
  • Explication des abrévations Explanation of abbreviations
  • PVDC PVDC
    : Polychlorure de vinylidène : Polyvinylidene chloride
    EVOH EVOH
    : Copolymère d'éthylène et d'alcool de vinyle Copolymer of ethylene and vinyl alcohol
    PP PP
    : Polypropylène : Polypropylene
    PE PE
    : Polyéthylène : Polyethylene
    PET PET
    : Polyester Polyester
    PA PA
    : Polyamide : Polyamide
    PVA PVA
    : Polyvinyl alcool : Polyvinyl alcohol
    OPP OPP
    : Polypropylène orienté : Polypropylene oriented

Claims (18)

  1. A sealed flexible sachet in the form of an individual portion, adapted to be extracted under pressure, containing at least one powdered substance for the preparation of a beverage selected from ground roast coffee, tea, soluble coffee, a mixture of ground coffee and soluble coffee, a chocolate product or any other edible dehydrated substance, consisting of two identical flexible sheets of circular, oval or polygonal shape, which provide between one another a space for a powdered substance and are sealed over their periphery so that the said sachet is substantially symmetrical with respect to its plane of sealing, the material used for the flexible sheets being impermeable to oxygen and water vapour for its storage and the sachet being opened only under the effect of the increase in pressure when the extraction fluid is injected.
  2. A sachet as claimed in claim 1, characterized by the presence of at least one tongue prolonging the edge of the sachet.
  3. A sachet as claimed in any one of claims 1 or 2, characterized in that the two sheets are stretched in order to support volume expansion without folding.
  4. A sachet as claimed in one of claims 1 or 2, characterized in that corrugations are intentionally and systematically provided in the two sheets.
  5. A sachet as claimed in one of claims 1 or 2, characterized in that it comprises one or two gussets.
  6. A sachet as claimed in any one of claims 1 to 5, characterized in that the substance to be extracted is compacted and takes the form of one or a plurality of pieces, the degree of compaction being such that there is a volume reduction of between 10% and 60%.
  7. A sachet as claimed in claim 6, characterized in that the free space between the two flexible sheets and the compacted substance represents between 1 and 20% of the total space between the said flexible sheets.
  8. A sachet as claimed in one of claims 6 or 7, characterized by the general hexagonal shape of the section of the sachet and the general octagonal shape of the compacted cake, providing an empty volume in the peripheral space, this space facilitating sealing free from powder.
  9. A sachet as claimed in any one of claims 1 to 8, characterized in that the compacted material has impressions on at least one of its surfaces adapted to facilitate the optimum distribution of water.
  10. A sachet as claimed in any one of claims 1 to 9, characterized in that the compacted material has at least one concave or convex surface.
  11. A sachet as claimed in any one of claims 1 to 10, characterized in that the powdered material is ground roast coffee.
  12. A sachet as claimed in any one of claims 1 to 11, characterized in that the material for the flexible sheets is selected from aluminium, PET, PE, PP, PA, PS, paper, EVOH, PVDC and PVA, the said sheets being single-layer or multi-layer.
  13. A sachet as claimed in any one of claims 1 to 12, characterized in that the material for the flexible sheets has the property that it creates leak-tightness about the water introduction means and closes again at least partially during removal to prevent discharges.
  14. A method for the manufacture of a sachet as claimed in any one of claims 1 to 13, characterized in that two flexible sheets impermeable to oxygen and water vapour are deformed in a symmetrical manner by moulding or by stretching, the quantity of powdered substance is metered out, this substance is placed on one of the deformed flexible sheets and the two sheets are sealed over their periphery.
  15. A method as claimed in claim 14, characterized in that the powdered substance is compacted into one or a plurality of pieces prior to metering.
  16. A method as claimed in claim 14, characterized in that the powdered substance is compacted after being placed on one of the flexible sheets.
  17. A method as claimed in any one of claims 14 to 16, characterized in that the compacted substance is decompacted after the closure of the sachet during the manufacturing process, for instance by vibration or by any other known mechanical means.
  18. A method as claimed in any one of claims 14 to 16, characterized in that the operations prior to the closure of the sachet are carried out under a current of an inert, oxygen-free, gas.
EP19930912540 1992-07-06 1993-07-02 Sealed flexible bag and method for making same Expired - Lifetime EP0602203B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP92111422 1992-07-06
EP92111422 1992-07-06
PCT/CH1993/000171 WO1994001344A1 (en) 1992-07-06 1993-07-02 Sealed flexible bag and method for making same
EP19930912540 EP0602203B1 (en) 1992-07-06 1993-07-02 Sealed flexible bag and method for making same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19930912540 EP0602203B1 (en) 1992-07-06 1993-07-02 Sealed flexible bag and method for making same

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EP0602203A1 true EP0602203A1 (en) 1994-06-22
EP0602203B1 true EP0602203B1 (en) 1997-04-16

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EP (1) EP0602203B1 (en)
JP (1) JP3332924B2 (en)
CA (1) CA2111991C (en)
DE (2) DE69309868T2 (en)
DK (1) DK0602203T3 (en)
ES (1) ES2102034T3 (en)
FI (1) FI110180B (en)
WO (1) WO1994001344A1 (en)

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US6025000A (en) 2000-02-15 grant
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DK0602203T3 (en) 1997-09-08 grant
FI110180B (en) 2002-12-13 application
US20030077359A1 (en) 2003-04-24 application
JPH06510264A (en) 1994-11-17 application
WO1994001344A1 (en) 1994-01-20 application
FI941013A (en) 1994-03-03 application
JP3332924B2 (en) 2002-10-07 grant
DE69309868D1 (en) 1997-05-22 grant

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