Separation and/or closure wall for a container and methods for assembling containers using such a wall

Abstract

A separation and/or closure wall designed in the first place, to cover the opening of at least a container to retain a substance contained therein for conservation before use, and subsequently to be torn to reveal said opening and release the substance outside said container for use. The separation and/or closure wall has a deformable membrane arranged on the periphery of the opening of the container to cover the same, with a tension which enables its being burst under the effect of a perforation and/or tear, to be retracted over the periphery and completely reveal said opening. The invention also concerns methods for assembling two containers each containing a substance portioned with respect to the other with such a separation and/or closure wall. The invention is applicable to food, pharmaceutical, and dietetic products.

Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] The present application is a national stage of PCT/FR02/02360 filed Jul. 5, 2002 and based upon French Application No. 01/08913 filed Jul. 5, 2001 under the International Convention.

FIELD OF THE INVENTION

[0002] The present invention relates to adaptations that permit assurance of closure of a packaging, that is, the packaging in a closed volume of at least one product for the purposes of keeping before its utilization, followed by the opening of the same packaging at the time of utilization of the said product under optimum conditions.

[0003] The present invention also concerns double packaging, that is, packaging in two different volumes of two products which are intended to be in contact for the purposes of mixing at the time of utilization.

DESCRIPTION OF PRIOR ART

[0004] The development of the food market, of chemistry, pharmaceutics, dietetics and cosmetics led to the creation of new products consisting of several substances which must not be mixed until the moment of their utilization.

[0005] The separation within the two substances to be mixed should be clear to ensure keeping of the products before utilization, notably when the mixing of these is possible only just a short time before their use, because of the physicochemical reaction caused by the mixing, as is frequently the case in the field of pharmaceutics for injectable products and pasty products, such as creams and gels or in the field of manufacture of certain hardeners of fast-acting glues, or creation of paint colors where the volumes of the two paints should each be dosed so as to provide a particular tint after mixing, resulting from the mixing of two paints.

[0006] In the food area, the separation of substances becomes important and, for several reasons, the main ones of which include:

[0007] esthetic aspect, because the eye of the client is more attracted by a bicolor or multicolor product on a shelf,

[0008] novelty, because the presence of two substances in the same packet is unusual,

[0009] the taste, because of the fact that the mixture is made in the last moment, which guarantees the distinction of aromas as well as the preservation of the taste,

[0010] the possibility for the client to choose a mixture or not, that is, to begin with one substance and finish with another.

[0011] In order to avoid mixing before consumption, the majority of multilayer food products present on the market today use a concept that is based on the existing difference of viscosity and density between the product that constitutes the layers, to prevent mixing them. The fact that this solution is widely used does not guarantee that mixing will not occur, notably during transportation which, due to poorly damped shocks, may cause instantaneous and unintended mixing of the two substances, thus making the product difficult to market.

[0012] A solution to these problems of migration and mixing of substances constituting the product to be sold is based on a new packaging concept, that is, double packaging.

[0013] A device for double packaging is described in French Patents Nos. 2633250 and 2783804, which propose a packaging made with a homogeneous and tight block superimposing two compartments, one of the containers having an orifice which is covered on its outside surface in a piercable manner by an exterior means, with which the said packaging is equipped, the said means of perforation also serving to perforate the separation of the two compartments in order that the two contents can mix. A disadvantage of this device is that the perforation of the separating cover does not always provide efficient communication between the two superimposed compartments, so that mixing is not provided under good conditions.

[0014] The double packaging as it exists at the present time may also be in other forms, such as:

[0015] a packet glued to the main container,

[0016] a packet packaged inside the main container,

[0017] a product to be added, located inside the cover.

[0018] The Applicants noted that, although this new concept of double packaging solves the problems of migration between the products, it removes the unity of the product, that is, the “added” packet or sachet is considered by the consumer to be an accessory. As a matter of fact, the consumer frequently loses the “additional” packaging, for various reasons:

[0019] by negligence,

[0020] because of the fact that an additional opening has to be performed on an auxiliary packet,

[0021] because of the fact that the utility of this packet is not recognized and

[0022] because of the lack of unity, the customer does not perceive the immediate complementarity with the first packaging.

[0023] There are several devices in the prior art that permit elimination of the above disadvantages. But, for example, the device, described and represented in the text of French Patent No. 2507573 consists of a two-compartmental container, the two compartments being separated by a separation wall that can be perforated by a perforating device placed inside the container. The disadvantage of this device is that it can be handled only with the aid of a straw, which provides the movement of the perforating device toward the separation wall of the two compartments. Moreover, the assembling conditions are not evident. As a matter of fact, according to the embodiment illustrated, the two compartments will be covered separately and then assembled so that their separation walls are superimposed and the perforating device provides tearing of both.

[0024] The difficulty in double packaging lies in the destruction of the separation and/or closure wall of the two packagings and in the method of assembly of these two latter. As a matter of fact, although the concept itself permits separate filling of the contents, followed by their assembly, several problems occur during the performance from the point of view of hygiene and from the point of view of maintaining the hygienic conditions to the final assembly.

[0025] Moreover, theoretically, double packaging requires twice as many assembling operations and twice as many working materials, which considerably increase the cost of the products presented in such packages. Thus, for example, the device described by the aforesaid patent superimposes two equivalent covers.

[0026] Another device of the prior art, described and represented in European Patent No. 0232814 starts from a two-compartment container, the cover of which has a perforating device. The deformation of the container in its totality permits perforation of the separation wall and mixing of the two substances stored separately. The opening of the container is done from the top and does not always remove the torn separation wall of the container. Moreover, the filling and covering by the cover under good conditions, notably under conditions accepted for food products, seems to be difficult to attain in the embodiments that are represented.

[0027] Another device described and represented in European Patent No. 0173547 proposes a container composed of three parts, namely:

[0028] a first principal container filled with a first substance,

[0029] a second container located in the first compartment and closing it, and being supported on the edge of its opening, and

[0030] a cover assuring closure of the second container and perforation of the bottom of the second compartment.

[0031] This concept of the two-compartment system has the disadvantage of perforating the bottom of a compartment and not a cover, which requires additional force from the user, as well as much more expensive materials for the perforating device and for the joints between the first and second containers.

[0032] Another device described and represented in U.S. Pat. No. 3,695,478 and in European Patent No. 0461693 proposes an elastically deformable stopper for the injection syringe, the objective of which is to separate the ampoule from the injection needle of the syringe. Tensioning of the membrane, which forms the upper part of the stopper, here has only the purpose of keeping the orifice formed by the perforation of the needle open during the injection or aspiration into the ampoule and then closing the said orifice again once the needle was removed, in order to assure good tightness.

[0033] Another device described and represented in British Patent No. 1,192,817 proposes a packaging for predosed dental amalgam, which has two compartments, containing two substances which are intended to be mixed only at the time of use, and which are separated by a membrane having a fragile or rupture zone which can be torn by means of a tearing device, such as an internal plunger, moved by axial sliding of one compartment in the other. This principle, which merely provides tearing of the membrane, additionally requires the presence of a foreign body (plunger) in one of the compartments, which naturally should be removed from the final mixture.

SUMMARY AND DETAILED DESCRIPTION

[0034] Starting from this state of affairs, the Applicants then carried out research aimed at improving this new concept of double packaging, the research having led to the conception of a new separation and/or closure wall of a container that permits elimination of the disadvantages of the existing double packagings cited above, while assuring separate storage of substances until their mixing before use under optimal conditions and without risk of migration between the two substances.

[0035] The problem that the Applicants proposed to solve in order to attain this objective is based on a separation and/or closure wall, which is capable first of all to cover the opening of at least one container to retain a substance introduced inside it for the purposes of storage before utilization and, secondly, to be torn by uncovering the said opening and thus releasing the substances out of the cavity of said container through this opening for the purposes of utilization.

[0036] In order to achieve this, they conceived a separation and/or closure wall of a container resting on a deformable membrane placed around the periphery of the opening of the said container to cover the latter with a tension that would permit it to be burst under the effect of perforation and/or tearing, in order to retract to the periphery of the said opening and uncover the aforesaid opening entirely. The presence of a deformable membrane tensioned on the periphery of the opening of a container offers great advantages both with regard to the closing function as well as that of the opening of the container. In fact, due to its great flexibility to deformation, the membrane will provide better shock resistance to the closed container and because of its ability to burst under the effect of simple perforation or simple pinching, to retract completely to the periphery of the opening of the container, the same membrane will provide complete uncovering of the said opening. It is self-evident that the person skilled in the art will utilize adequately all the physicochemical parameters of the material employed for the deformable membrane in order to determine compatibility with the substance contained in the cavity of the container that it closes, and, by using a classical dynamometric study, will determine the ability of the membrane to flex and/or to resist shock when under tension and exposed to the effect of shock of blunt objects and/or to the pressure of the substance contained inside the container with its immediate ability to be torn and burst under the effect of the pressure of an object perforating or cutting or pinching by torsion of the said membrane. The physical properties of this deformable membrane thus are reminiscent of those of the membrane of a balloon, which, when it is blown up with a gaseous fluid, increases the volume and accepts a flexion when it is compressed with the hands (blunt object), while it bursts when it encounters the thorn of a rosebush (a perforating or cutting object). Another advantage of such a deformable membrane, which, during industrial serial production could be in the form of an extended film according to a known method of manufacture, which will be adjusted and maintained on the periphery of the openings of the juxtaposed containers, is to increase the surface of the film to cover the said openings, greatly reducing the price of the closure walls thus produced. Another advantage of such a deformable membrane is its adaptability to any profile of the opening and thus to any container presently on the market.

[0037] It is apparent that, in comparison to other devices of the prior art described above, the means of opening of the periphery of the container is only provided here by the ability of bursting the membrane, which previously provided the closing of the container, a bursting which can only be produced by previously placing the same membrane under tension. Thus, we are not dealing here with a tension for maintaining a constant orifice at the time of passage of a needle and then to close it, or with a zone of fragilization of a membrane that can be torn with a plunger.

[0038] According to a particularly advantageous characteristic of the invention, the aforesaid deformable wall separation and/or closure membrane is made of a pliable material in order to withstand the deformation under tension more easily, notably the flexion when it is tensioned to resist excessive shock to which containers are generally subjected.

[0039] According to another particularly advantageous characteristic of the invention, the aforesaid deformable membrane of the separation and/or closure wall is made of an elastic material in order to withstand a greater deformation under tension and to offer better retractability on the periphery of the opening under the effect of tearing, as a function of the modulus of elasticity of the material used. As indicated above, this modulus of elasticity will also be adjusted to other physicochemical parameters of the material, selected judiciously to permit the membrane tensioned on the periphery of the opening to resist shocks by blunt objects and/or the pressure of the substance contained inside the container without tearing, while tearing and bursting with little flexion under the effect of contact with a cutting or perforating object or under the effect of torsion causing pinching, followed by tearing of the said membrane, or by combination of these two modes of bursting of the said membrane.

[0040] According to another particularly advantageous characteristic of the invention, the aforesaid deformable wall separation and/or closure membrane is made of a plastic material which will facilitate putting the membrane in place on the periphery of the opening of the container, and accepting a deformation under tension and providing hermetic sealing on the periphery of the opening by packing, gluing or by any other equivalent technique known to the person skilled in the art.

[0041] According to another particularly advantageous characteristic of the invention, the aforesaid deformable wall separation and/or closure membrane is placed tightly on the periphery of the opening of the container in order to provide absolute separation between the inside and the outside of the closed container by the said membrane. This arrangement allows filling the container under vacuum.

[0042] According to a first embodiment of the invention, the aforesaid deformable wall separation and/or closure membrane is tensioned directly on the periphery of the opening of the said container. This embodiment will be particularly suitable when the production chain in which the membrane is put in place will lay out the containers. This case, which will surely be the most frequently used for reasons of economy, could also be used for containers filled with substance, as well as for empty containers, the filling of which in a filling unit different from the unit that places the membrane, will subsequently occur through another opening, which will be closed classically by a cap or a cover that can be sealed on its periphery.

[0043] According to a second embodiment of the invention, the aforesaid deformable wall separation and/or closure membrane is tensioned on a support placed on the periphery of the opening of the said container. This second embodiment will be particularly suitable when the production chain that provides the placement of the membrane will not have the containers, that is, when the support with its extended membrane will be installed on the periphery of the opening of the container by a production unit, for example, by that which will perform the filling of the substance into the cavity of the container.

[0044] As described above, the membrane of the invention finds direct application in serving as the separation and/or closure wall of a container considered as simple and classical packaging of a product to be seen when presented for sale, such as the packaging most commonly known under the name of “blister” packaging, that is, a transparent plastic cover glued onto a tearable support, in the form in which some merchandise is sold, such as tablets, gel caps or lyophilized or nonlyophilized pharmaceutical products, presented in the form of plates with several recesses in which the said products can be contained by the membrane of the invention.

[0045] However, the first application of the new concept of separation and/or closure wall of the present invention, which lead to the main research work of the Applicants and the double packaging, that is, the packaging of several substances in different volumes which are intended to come in contact for the purposes of mixing at the time of their utilization. To satisfy this need, the Applicants thus improvised, according to the fundamental concept of the invention, the arrangement of a deformable membrane, tensioned between at least two volumes of substance, in order to form first of all a physical barrier between the said volumes of two substances delimited by the said membrane in at least one container for the purposes of isolated storage of substances, and, secondly, to put into communication the said volumes by tearing and bursting of the tensioned membrane in order to provide good flow of substances between the two volumes, mixing of the said two substances for the purpose of utilization of the latter.

[0046] The utilization of a separation and/or closure wall based on the utilization of a deformable membrane installed under tension, which bursts under the effect of contact with a perforating or cutting object or by tearing under the effect of torsion or by the combination of these two modes of bursting of the said membrane, permits considerable improvement of the concept of double packaging indicated above, with, on the one hand, the two volumes being physically separated before utilization so that the double packaging will be maintained, avoiding any problem of migration between the two substances, and, on the other hand, putting the two volumes in free communication after bursting of the membrane, to produce the mixture correctly. Advantageously, in combination with tight attachment of this membrane on one of the containers, it permits filling this container under vacuum and also aspiration of the other substance, which will greatly facilitate the mixing operation of the two substances. Moreover, the techniques of assembling or the creation of the compartments can be adapted to any production unit, whether or not the operation of placement of the membranes takes place after or before the filling operation of the containers or whether or not the two units of placement and filling of the containers are separate.

[0047] Thus, a first embodiment of the assembly of the two containers consists of the following:

[0048] tensioning a deformable membrane according to the invention on the periphery of the opening of a first container in one placement unit,

[0049] filling the first container with a first substance and closing the said first container, for example, by means of a sealable cover, in a filling unit which can be separated from the placement unit,

[0050] filling the second container with a second substance via a filling opening, in a filling unit which can be the same or different from the filling unit of the first container,

[0051] and assembling the two containers by sealing, clipping or screwing the first container on the second container by joining the peripheries of the openings of the container in such a way that the two containers are separated, via the separation wall which forms the aforesaid closing membrane with their openings facing one another.

[0052] This first mode of assembly, which is carried out by superimposing two containers joined at their openings, the volumes of which are partitioned by the tensioned membrane, permits, among other things, to be able to differentiate the membrane placement unit from the container filling unit, because frequently the first unit has specialized packaging production chains and the second unit has specialized substance filling production chains. Moreover, if the substances used must be produced in different units, this first mode of assembly finds particularly dedicated application to the extent that it can allow the manufacture of the containers in one unit, the placement of the deformable membrane in another unit, the filling of the first container in one unit and the filling of the second container in another unit. Thus, for example, in the food area, one of the containers can be subcontracted, thus giving the possibility to a business specializing in dairy products to provide products with double packaging without having to diversify its production, by subcontracting one of the containers to a business specializing in the manufacture of the product to be added, which is different from the dairy product.

[0053] A second mode of assembly of two containers consists in the following:

[0054] filling the first container with a first substance via a filling opening, in a first filling unit,

[0055] closing the aforesaid filling opening of the first container by tensioning the said wall separation and/or closure membrane on the periphery of the filling opening, in a placement unit which can be integrated with the first filling unit,

[0056] filling the second container with a second substance via a filling opening, in a filling unit which can be the same or different from the first filling unit,

[0057] and assembling the two containers by sealing, clipping or screwing of the first container onto the second container by joining the peripheries of the two filling openings of the two containers so that the two containers are separated via the separation wall, which forms the aforesaid closing membrane, with their openings facing one another.

[0058] This second mode of assembly permits control of the deformable membrane placing unit and the container filling units in the same production chain.

[0059] A third mode of assembly of assembly of the two containers consists of:

[0060] tensioning the aforesaid deformable wall separation and/or closure membrane on the periphery of the opening of the first container, in a placement unit,

[0061] filling the second container with a second substance via an inlet opening, in a first filling unit which can be different from the placement unit,

[0062] assembling the two containers by hermetic engagement of the first container in the inlet opening of the second container by first placing the membrane inside the second container so that the two contents are only separated by the said closure membrane,

[0063] filling the first container with a first substance in a second filling unit which can be the same as or different from the first filling unit,

[0064] and closing the openings of the two containers simultaneously.

[0065] This third mode of assembly offers the same possibilities as those of the first mode of assembly with respect to the placement and filling units. However, as that which was recalled above in European Patent No. 0173547, it proposes to assemble the containers differently by providing to lodge the first in the second by closing it and supporting it on the edge of its opening, for example, with a cover that concomitantly assures hermetic sealing of the two containers. This mode of assembly thus avoids assembly by sealing of the two containers at the membrane.

[0066] A fourth mode of assembly of the two containers consists of:

[0067] filling the first container with a first substance via a filling opening, in a first filling unit,

[0068] closing the aforesaid filling opening of the first container by tensioning the aforesaid deformable membrane of the separation and/or closure wall on the periphery of the filling opening, in a placement unit which can be integrated with the first filling unit,

[0069] filling the second container with a second substance via a filling opening, in a second filling unit which can be the same as or different from the first filling unit,

[0070] assembling the two containers by hermetic engagement of the first container in the filling opening of the second container by first placing the membrane inside the second container so that the two containers are separated only by the aforesaid closure membrane.

[0071] This fourth mode of assembly offers the same possibilities of those of the second mode of assembly with respect to the placement and filling units and the same possibilities as those of the third mode of assembly with respect to the actual joining of the two containers.

[0072] A fifth mode of assembly concerning a single container consists of the following:

[0073] tensioning the aforesaid deformable wall separation and/or closure membrane on a support, in a placement unit,

[0074] filling the first compartment of the container with a first substance via the filling opening, in a first filling unit which can be different from the placement unit,

[0075] positioning the said support with the tensioned membrane, on the contours of an internal shoulder of the container, via the aforesaid filling opening,

[0076] filling the second compartment located on the other side of the membrane of the container with a second substance via the said filling opening, in a second filling unit which can be the same as or different from the first filling unit,

[0077] and closing the aforesaid filling opening of the container.

[0078] This fifth mode of assembly, which applies more precisely to a container which has a bottom and a filling opening, permits the partitioning of one container into one or several compartments according to the number of supports installed with the placement and filling units which can be the same or different.

[0079] A sixth mode of assembly concerning a single container consists of the following:

[0080] tensioning the aforesaid deformable membrane of the separation and/or closure wall on a support, in a placement unit,

[0081] positioning the said support with the tensioned membrane on the contours of an internal shoulder of the container,

[0082] filling the first compartment of the container with a first substance via the first filling opening, in a first filling unit which can be different from the placement unit,

[0083] filling the second compartment located on the other side of the membrane of the container with a second substance via the second filling opening in a second filling unit, which can be the same as or different from the first filling unit,

[0084] and closing the two filling openings of the two compartments of the aforesaid container.

[0085] This sixth mode of assembly differs from the fifth in that it applies to a container having two opposite filling openings.

[0086] It is understood that the separation and/or closure wall and the modes of assembly of the containers, which were described above, were made in view of a disclosure rather than a limitation, and their purpose is to underline the most elementary expression of the fundamental concept of the invention, which is based on the original utilization of a tensioned deformable membrane on the periphery of an opening to provide the closure of a cavity of a container. This is why the means of bursting the membrane with a perforating or cutting organ or by torsion of the latter to produce pinching, triggered by a manual action of the user/consumer was not described in the present Description because it is without direct implication on the concept of the invention. The method of bursting of the membrane could be carried out easily depending on the method of assembly used. It can be obtained with the aid of a perforating object, such as described in numerous patents of the prior art, such as one lodged inside of one of the containers or one located outside or between the two containers or one formed by the wall of one of the containers so that a supplementary device is not added to the assembly of the two containers. Another method of bursting of the membrane will be obtained without a piercing object by simple increase of the tension of the membrane under the effect of accentuated pressing of the upper packaging on the lower packaging or under the effect of turning the upper container in the lower packaging. In this case, there is torsion of the membrane, generating an increase of the tension of the membrane, in combination with a pinching phenomenon, leading to tearing of the latter. The clipping or torsional phenomenon can be combined with the presence of a perforating object placed inside one of the compartments and being attached to the wall of these latter. Similarly, the membrane could be made from a single or composite material and/or of a monolamellar or multilamellar material and/or with incorporation or no incorporation of an insulating substance, such as aluminum, teflon or similar, and/or with the two faces treated to be compatible with the two media with which they are in contact. This same membrane could be selective toward gases in contact with it, allowing them to pass through or not, such as nitrogen, oxygen or carbon dioxide, thus permitting better preservation of the product contained in one or the other compartments, depending on the membrane used.

[0087] As in the food area, double packaging is also applicable in the pharmaceutical area, notably in the case of syringes with double compartment in which a first substance is contained in the body of the syringe and the second substance is contained in that of the piston, the latter being closed by a membrane of the invention placed in contact with the first substance, so that the said membrane serves the purpose as a separation wall between the two substances which can be either two liquids or a powder and a liquid. Placement of the two substances in contact is obtained by simple pressing on the piston, thus resulting in a bursting of the membrane with the aid of a perforating obstacle placed inside the body of the syringe that can be attached to or not attached to the latter or by turning of the piston in the body of the syringe, thus generating torsion of the membrane, resulting in its rupture.

Claims

1-18 (cancelled)

19. A separation wall for a packaging having at least two compartments, intended, firstly, to cover the opening of at least one said compartment to hold a substance introduced therein for the purpose of conservation before utilization, and, secondly, to be torn to uncover the said opening and to release the substance from said compartment into the second compartment for the purposes of utilization,

wherein said separation wall consists of a deformable membrane, arranged under tension on the periphery of the opening of said compartment to cover the latter, which permits it to be burst under the effect of perforation or tearing, to be retracted onto the periphery of the said opening and to uncover said opening entirely, as the membrane of a balloon, which, when it is blown up with a gaseous fluid, increases in volume and accepts flexing when it is compressed with a hand or blunt object, while it bursts when it encounters the thorn of a rosebush or other piercing or cutting object.

20. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is arranged tightly on the periphery of the opening of the said compartments.

21. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is made of a pliable material.

22. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is made of an elastic and/or plastic material.

23. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is made of a single material.

24. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is made of a composite material.

25. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is made of a monolamellar or multilamellar material.

26. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is made of a material containing an insulating substance.

27. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is made of a material which has a selectivity to gases.

28. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is tensioned directly on the periphery of the opening of the compartments.

29. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is tensioned on a support mounted on the periphery of the opening of the compartments.

30. The separation wall according to claim 19, wherein said deformable membrane of the separation wall is arranged under tension between at least two volumes of substances, in order to form, firstly, a physical barrier between the volumes of the said two volumes of substances delimited by the said membrane in at least one compartment for the purpose of isolated storage of the substances, and, secondly, by tearing and bursting of the tensioned membrane with a perforating and/or cutting object or by pinching under the effect of torsion of the latter, a means of placing in communication the said volumes to assure the mixing of the said two substances.

31. A method of assembling at least two compartments, each containing a substance, wherein said substances are partitioned from one another by a separation wall according to claim 30, said method comprising:

tensioning said deformable membrane of the separation wall on the periphery of the opening of a first compartment,

filling the first compartment with a first substance and closing the first compartment,

filling a second compartment with a second substance via a filling opening, and

assembling the two compartments by sealing, clipping or screwing of the first compartment onto the second compartment by bonding the peripheries of the openings of the two compartments, so that the two compartments are separated with their openings facing one another via the closure wall formed by the aforesaid separation membrane.

32. A method of assembling at least two compartments, each containing a substance partitioned from one another by a separation wall according to claim 30, said method comprising:

filling a first compartment with a first substance via a filling opening,

closing the filling opening of the first compartment by tensioning the deformable membrane of the separation wall on the periphery of the filling opening,

filling a second compartment with a second substance via a filling opening, and

and assembling the two compartments by sealing, clipping or screwing of the first compartment onto the second compartment by bonding together the peripheries of the two filling openings of the two compartments in such a way that the two compartments are separated with their openings facing one another, via the separation wall formed by the aforesaid closure membrane.

33. A method of assembling at least two compartments, each containing a substance partitioned from one another by a separation wall according to claim 30, said method comprising:

tensioning the aforesaid deformable membrane of the separation wall on the periphery of the opening of a first compartment,

filling a second compartment with a second substance via a filling opening,

assembling the two compartments by hermetic engagement of the first compartment in the inlet opening of the second compartment by prearranging the membrane in the inside of the second compartment so that the two compartments are only separated by the aforesaid closure membrane,

filling the first compartment with a first substance, and

closing the two compartments.

34. A method of assembling at least two compartments, each containing a substance, partitioned from one another by a separation wall according to claim 30, said method comprising:

filling a first compartment with a first substance via a filling opening,

closing the filling opening of the first compartment by tensioning the deformable membrane of the separation wall on the periphery of the opening,

filling a second compartment with a second substance via a filling opening, and

assembling the two compartments by hermetic engagement of the first compartment in the filling opening of the second compartment by prearranging the membrane inside of the second compartment in such a way that the two compartments are separated only by the aforesaid closure membrane.

35. A method of assembling a compartment having a single filling opening with at least two substances partitioned from one another by a separation wall according to claim 30, said method comprising:

tensioning the deformable membrane of the separation wall on a support,

filling a first compartment of the compartment with a first substance via the filling opening,

positioning the support with the membrane tensioned on the contours of an internal shoulder of the compartment, via the aforesaid filling opening,

filling a second compartment located on the other side of the membrane of the compartment, with a second substance via the filling opening, and

closing the filling opening of the compartment.

36. A method of assembling a compartment having two opposite filling openings with at least two substances partitioned from one another by a separation wall according to claim 30, said method comprising:

tensioning the deformable membrane of the separation wall on a support,

positioning the support with the tensioned membrane on the contours of an internal shoulder of the compartment,

filling a first compartment of the compartment with a first substance via a first filling opening,

filling a second compartment located on the other side of the membrane of the compartment with a second substance via a second filling opening, and

closing the two filling openings of the first and second compartments of the aforesaid compartment.