WATER SOLUBLE CONTAINER

Description

[0001] The present invention relates generally to a water-soluble container.

[0002] Water-soluble containers as such are well-known and have a variety of uses, such as in clothes washing. For example, CA 1112534 describes a water-soluble container for a detergent composition. The water-soluble material may be, for example, polyvinyl alcohol (PVOH). This document describes a single chamber with a film form wall of constant thickness. Because the chamber wall is of constant thickness, the entire wall must be dissolved before any product can escape. In certain circumstances product may be required quickly, before the time when the entire container has dissolved. WO 01/83668, EP 593 952, GB 2 356 842 and WO 01/36290 all disclose prior art containers in accordance with the preamble of appended claim 1. According to the present invention there is provided a water-soluble container comprising one ore more discrete chambers for containing product, wherein at least part of a wall of the or at least one of the chamber/s is adapted to dissolve before the remainder of the chamber to allow product to escape, characterised in that the at least part of the wall adapted to dissolve before the remainder of each chamber defines a panel and the at least part of the wall at least partly surrounds the panel, such that when the at least part of the wall dissolves the panel is either partly or completely released undissolved. This means that product can escape from a chamber without requiring complete dissolution of the chamber. This can be useful for decreasing the time taken for product to be released. It can also allow for a greater degree of control over when product is released because the area required to be dissolved is reduced.

[0003] A container according to the present invention for a system combining the advantage of not requiring a whole chamber to dissolve before a product is released, together with the possibility of sequential release of products. In its simplest form a chamber provided with the means for allowing product to escape before complete dissolution could be associated with a chamber not having those means. More complicated systems could involve chambers which allow products to escape after different times before complete dissolution.

[0004] The ability of such containers to provide for sequential release of multiple products is extremely useful. For example, clothing washing usually includes a detergent stage and a stage later in the washing cycle in which a softening agent is introduced. Dish-washing sometimes includes a detergent stage and a separate rinsing stage. In many cases it would be preferable and sometimes essential for different stages of washing operations to be kept completely separate.

[0005] By providing for sequential release of products the present invention removes the need for manual intervention at different stages of washing cycles and allows the complete washing product to be packaged and supplied together.

[0006] The at least part of the wall will most usually be an exterior surface of the container thereby releasing product from the container when it dissolves. However, it is also possible that the at least part of the wall forms part of a chamber which is housed within another chamber which itself includes water, whereby the contents of the chambers are mixed when the at least part of the wall dissolves. This might be useful, for example, if the product in the inner chamber is activated by product in the outer chamber. This allows activation in a controlled environment before the activated product is released into the exterior of the container and could be useful for products which become unstable once activated.

[0007] There are many ways in which the container could be formed in order that product is released from the chamber when the part of the wall dissolves.

[0008] The part of the wall may comprise one or more clip elements, such as a hook. The clip elements initially clip the closure part to the container but then dissolve and release the releasable panel. In this way only a small section of the wall dissolves and yet a large opening can be provided quickly.

[0009] There are many ways in which the part of the wall could be formed in order that it dissolves before the remainder of the container. For example, the at least part of the wall could be made from a thinner section of material and/or from a different material with a faster rate of dissolution than the remainder of the container.

[0010] In embodiments where the at least part of the wall is thinner than the remainder of the container the material thinning may be arranged on the interior surface of the chamber wall. This is particularly relevant when the at least part of the wall defines a thin channel, because if the material thinning was arranged on the exterior surface the channel could become saturated with dissolved material, which would impede further dissolution.

[0011] In order to simplify production and allow for high volume production the container may be formed by injection moulding. In embodiments where the at least part of the wall is a thin section surrounding a panel, the area of the panel may form the gate region for injection moulding. This ensures that the thin section is correctly moulded by avoiding problems with moulded regions which are remote from the injection point.

[0012] As stated above, differential dissolution characteristics may be achieved by forming the container from two or more different materials at least some of which are water-soluble. It may, however, be preferable for simplification of the production process for the whole of the container to be formed from the same material.

[0013] In some embodiments at least part of the material from which the container is formed is a polyvinyl alcohol. Alternatively at least part of the material may be a polylactic acid or a starch based material.

[0014] The container may be flexible. This may be as a result of the choice of material and/or the thickness of the walls.

[0015] Where a container has several walls, the term "wall" can refer to any one or more of the walls. A spherical container, for example, has a single wall whereas a cube has six walls. The term is therefore generic and could refer to any part of the material defining the chamber.

[0016] The present invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:

Fig 1 is a perspective view of a housing formed as part of a container according to a first embodiment;

Fig 2 is a section along line II - II of Fig 1,

Fig 3 shows the housing of Fig 2 with a lid component attached;

Fig 4 shows the container of Fig 3 following an initial exposure to water;

Fig 5 is a section through a container according to an alternative arrangement not covered by the appended claims; and

Fig 6 is a section of a container according to an alternative embodiment.

[0017] Referring first to Figs 1 and 2 there is shown a housing 10 of generally parallelepiped shape comprising a base wall 11, side walls 12,13 and end walls 14,15. The housing is hollow and is open opposite the base 11 to form a tray-like structure. The housing 10 is formed from a water-soluble material. The material could be, for example, a grade of PVOH which dissolves at approximately 50°C. The interior of the housing 10 is divided into two discrete chambers 30, 31 by spaced parallel partition side walls 16, 17 which extend from end wall 15 and are joined at their ends by a partition end wall 18. Each of the partition walls 16, 17, 18 extends the full height of the housing walls 11, 12, 13, 14, 15. The portion of the base wall 14 which is bounded by the partition walls 16, 17, 18 includes a panel 19 surrounded by a region of material thinning 20 the purpose of which will be described in more detail below.

[0018] Referring now to Fig 3 the housing of Figs 1 and 2 is shown forming part of a container 1. The housing 10 is closed by a lid 25. The chambers 30, 31 are filled with different products before the lid 25 is applied. The lid 25 includes a panel 26 and region of material thinning 27 opposite and identical to those of the housing 10. The lid 25 may be secured to the housing 10 by any convenient means such as welding adhesion, interference fit or clipping. In this embodiment the seal is a face seal bond which is chemically activated, in this case by water, and supported internally by a wall 28 depending from the lid 25.

[0019] In this embodiment the thickness of the housing walls and the lid is approximately 0.4mm. This is about the thinnest that material can be without a risk of 'pin holes' i.e. tiny holes in the material which could compromise the integrity of the chamber. The material thinnings are approximately 0.15mm thick and are formed by reducing a small part of the uniform thickness of the container.

[0020] In use, the container 1 is placed in an aqueous environment and the temperature is raised beyond the dissolution temperature of the container material. As the container 1 begins to dissolve the material thinned regions 20, 27 will completely dissolve before the remainder of the container. As a result, the panels 19, 26 are released from the lid 25 and the base wall 14 such that product can escape from the chamber 31. Of course, the panels 19, 26 do not have to be completely released to be effective. For example the material thinned regions 20, 27 could extend part way round the panels 19, 26 such that the panels 19, 26 become flaps which hinge open. Product from the chamber cannot escape until the remainder of the container has dissolved.

[0021] Referring now to Fig 5 there is shown an alternative arrangement. In this arrangement two discrete chambers 130, 131 are formed from two separate, hollow cube-shape housings 110a, 110b which are bonded together along adjacent side walls 112a, 112b. Each housing 110a, 110b is open along one side by closed by a lid 125a, 125b in this embodiment sealed to the housings by adhesion. The lids 125a, 125b are formed from different grades of PVOH which dissolve at different rates, with the material of the lid 125a having the faster dissolution rate. In this embodiment therefore the lid 125a of the housing 110a dissolves before the lid of housing 110b, to allow its product to escape first.

[0022] Referring to Fig 6 there is shown a container 201 with a single chamber 230. A generally cuboid housing 210 comprises a base wall 211 and side walls 214, 215. An open side of the housing 210 is closed by a lid 225.

[0023] The lid 225 is held onto the housing 210 by a clip 220 extending from its periphery. The clip 220 engages under a bead 235 formed around the open side of the housing 210.

[0024] The clip 220 is thinner than the remainder of the container 201. Accordingly, in use of the container the clip 220 dissolves before the remainder of the container so that the bead 235 no longer retains the lid 225, and therefore allows the lid 225 to be released from the housing 210.

Claims

1. A water-soluble container (1) comprising one ore more discrete chambers (30, 31) for containing product, wherein at least part (20, 27) of a wall (11, 25) of the or at least one of the chamber/s is adapted to dissolve before the remainder of the chamber to allow product to escape,
characterised in that
the at least part (20, 27) of the wall (11, 25) adapted to dissolve before the remainder of each chamber defines a panel (19, 26) and the at least part of the wall at least partly surrounds the panel, such that when the at least part of the wall dissolves the panel is either partly or completely released undissolved.

2. A container (201) according to Claim 1, wherein the at least part of the wall (225) comprises one or more clip elements (220) adapted to retain the panel (225) until dissolved.

3. A container (1) according to Claim 1 or Claim 2, wherein the at least part (20, 27) of the wall is thinner than the remainder of the container.

4. A container (1) according to Claim 3, wherein the material thinning (20, 27) is arranged on the interior surface of the chamber wall.

5. A container (1) according to any preceding claim, wherein the container is formed by injection moulding.

6. A container (1) according to any preceding claim, wherein at least part of the material from which the container is formed is a polyvinyl alcohol.

7. A container (1) according to any preceding claim, wherein at least part of the material from which the container is formed is a polylactic acid.

8. A container (1) according to any preceding claim, wherein at least part of the material from which the container is formed is starch-based.

9. A container (1) according to any preceding claim, wherein the whole of the container is formed from the same material.

10. A container (1) according to any preceding claim, wherein the container is flexible.

11. A container according to any preceding claim, comprising two or more chambers, wherein each chamber has a panel and the at least parts of the wall for each panel dissolve at different rates so that the products contained in the chambers are allowed to escape sequentially.

Ansprüche

1. Wasserlöslicher Behälter (1) bestehend aus einer oder mehreren ein Produkt enthaltenden eigenständigen Kammern (30, 31), wobei mindestens ein Teil (20, 27) einer Wand (11, 25) der Kammer/n so beschaffen ist, dass er sich vor dem Rest der Kammer auflöst, damit das Produkt auslaufen kann,
dadurch gekennzeichnet, dass
mindestens ein Teil (20, 7) der Wand (11, 25) so ausgebildet ist, dass er sich auflöst, bevor der Rest jeder Kammer eine Platte (19, 26) bildet und mindestens ein Teil der Wand die Platte zumindest teilweise umgibt, sodass mindestens ein Teil der Platte entweder teilweise oder ganz in ungelöster Form freigegeben wird, wenn sich mindestens ein Teil der Wand auflöst.

2. Behälter (201) gemäß Anspruch 1, dadurch gekennzeichnet, dass mindestens ein Teil der Wand (225) ein oder mehrere Klemmelemente (220) aufweist, die so eingerichtet sind, dass sie die Platte (22) bis zur Auflösung festhalten.

3. Behälter (1) gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass mindestens ein Teil (20, 27) der Wand dünner ist als der Rest des Behälters.

4. Behälter (1) gemäß Anspruch 3, dadurch gekennzeichnet, dass die dünneren Stellen (20, 27) des Materials an der Innenfläche der Kammerwand angeordnet sind.

5. Behälter (1) gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Behälter im Spritzgießverfahren geformt wird.

6. Behälter (1) gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mindestens ein Teil des Materials, aus dem der Behälter geformt ist, Polyvinyllkohol darstellt.

7. Behälter (1) gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mindestens ein Teil des Materials, aus dem der Behälter geformt ist, eine Polyaktidsäure darstellt.

8. Behälter (1) gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mindestens ein Teil des Materials, aus dem der Behälter geformt ist, stärkebasiert ist.

9. Behälter (1) gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der gesamte Behälter aus demselben Material geformt ist.

10. Behälter (1) gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Behälter flexibel ist.

11. Behälter gemäß einem der vorhergehenden Ansprüche mit zwei oder mehreren Kammern, dadurch gekennzeichnet, dass jede Kammer eine Platte aufweist und dass sich mindestens Teile der Wand jeder Platte zu verschiedener Zeit auflösen, sodass die in den Kammern enthaltenen Produkte der Reihe nach freigegeben werden können.

Revendications

1. Récipient soluble dans l'eau (1) comprenant une ou plusieurs chambres discrètes (30, 31) pour contenir un produit, dans lequel au moins une portion (20, 27) d'une paroi (11, 25) de la ou des chambre(s) ou d'une au moins parmi les chambres est apte à se dissoudre avant le reste de la chambre pour permettre au produit de s'échapper,
caractérisé en ce que
la au moins une portion (20, 27) de la paroi (11, 25) apte à se dissoudre avant le reste de chaque chambre définit un panneau (19, 26) et la au moins une portion de la paroi entoure au moins partiellement le panneau, de sorte que le panneau soit partiellement ou entièrement libéré sans être dissout lorsque la au moins une portion de la paroi se dissout.

2. Récipient (201) selon la revendication 1, dans lequel la au moins une portion de la paroi (225) comprend un ou plusieurs éléments d'agrafage (220) qui est apte à retenir le panneau (225) jusqu'à dissolution.

3. Récipient (1) selon la revendication 1 ou la revendication 2, dans lequel la au moins une portion de la paroi (20, 27) est plus mince que le reste du récipient.

4. Récipient (1) selon la revendication 3, dans lequel l'amincissement du matériau (20, 27) est situé sur la surface intérieure de la paroi de la chambre.

5. Récipient (1) selon l'une des revendications précédentes, dans lequel le récipient est formé par moulage par injection.

6. Récipient (1) selon l'une des revendications précédentes, dans lequel au moins une partie du matériau dans lequel le récipient est formé est un polyalcool de vinyle.

7. Récipient (1) selon l'une des revendications précédentes, dans lequel au moins une partie du matériau dans lequel le récipient est formé est un acide polylactique.

8. Récipient (1) selon l'une des revendications précédentes, dans lequel au moins une partie du matériau dans lequel le récipient est formé est amylacée.

9. Récipient (1) selon l'une des revendications précédentes, dans lequel l'intégralité du récipient est formée avec le même matériau.

10. Récipient (1) selon l'une des revendications précédentes, dans lequel le récipient est flexible.

11. Récipient selon l'une des revendications précédentes, comprenant deux chambres ou davantage, dans lequel chaque chambre possède un panneau et les au moins une portion de la paroi de chaque panneau se dissolvent selon différents taux, de sorte que les produits contenus dans les chambres puissent s'échapper séquentiellement.

Drawing