CN1273358C - Device for packaging at least one product especially for cosmetics - Google Patents

Abstract

The present application relates to a device (1) for packaging a product, in particular a cosmetic product, comprising: i) at least one chamber (9, 12) for containing said product; ii) at least partially elastically compressible and iii) means (2, 3) capable of generating hydraulic pressure on at least a part of said compressible member (20) according to manual control, the hydraulic pressure Applied in at least two opposite directions so as to cause a reduction in the volume of the compressible member to at least partially release the channel. The device is particularly suitable for extemporaneous mixing of at least two products packaged separately.

Description

Device for packaging at least one cosmetic product and device for extemporaneous mixing of at least two products

technical field

The invention relates to a device for packaging at least one cosmetic product. The invention relates in particular to a device for extemporaneously mixing at least two products in order to produce a composition, in particular a cosmetic composition, for example, for use in the field of hair coloring.

Background technique

However, other uses may also be involved. The device may notably be of the type comprising a container containing said product, the dispensing of which can be effected according to the pressure exerted on the wall of said container or by means of a manually operated pump mounted on the device. For devices of this type, especially for certain products which have a strong tendency to dry out or oxidize when exposed to air, it is desirable to ensure a hermetic closure of the dispensing orifice of the device, so that the Residual product maintains an airtight seal.

In other fields such as hair dyeing, the preparation of many coloring compositions involves the extemporaneous mixing of two (or even three) products (colour, oxidizing agent and possibly fragrance) which for reasons of stability must remain Separate from each other until it's time to use the coloring composition. At least one of the products may be in powder form.

In recent years, the field of hair coloring has witnessed the advent of mixing devices capable of packaging two products individually in a substantially automatic manner and mixing them extemporaneously at the time of application of the coloring composition. A device of this type is disclosed in patent application FR-A-2708913 purely for illustrative purposes.

Such systems are expensive and often complex to manufacture. It is often difficult to achieve a seal between two chambers containing each product separately. Additionally, it is sometimes difficult to find materials that are compatible with the composition to be packaged because at least one of the packaged products is very corrosive.

There are also systems that tend more towards "manual" work, where each product to be mixed is packaged in its own packaging, in particular in the form of a tube or bag. To perform the mixing, the user injects the contents of one package into the other, or injects the contents of both packages into a third package, where the mixing takes place.

All these manipulations are very cumbersome. There is a high risk of contamination during handling of the product. There is also a high risk that the user will fail to take the correct dose of the product and will use the amount required for one use in two or more uses. In this way, the result of hair dyeing is not in line with the expected result.

Patent EP0606429 discloses a mixing system with two chambers separated by a first rubber piston which is pushed from its first position separating the two products to a second position depending on the pressure exerted by the second piston , in the second position, it forms a channel together with the inner surface of the neck separating the two chambers, allowing the two products to come into contact.

The disadvantages of this structure are manifold. Therefore, it is not very suitable for mixing non-liquid products, especially those in powder form. It is limited to small volume preparations. It is not very comfortable to use, especially the high pressure required to force the rubber piston to deform and enter the part whose cross-sectional shape differs from that of the piston.

Contents of the invention

It is therefore an object of the present invention to make a packaging device, in particular for the temporary mixing of at least two products, which completely or partially solves the above-mentioned problems associated with the above-mentioned traditional systems.

A particular object of the invention is to create a device that is simple to use and that can be produced at low cost.

Another object of the invention is to create a device that limits the risk of misuse and thus reduces the risk of obtaining a product whose properties do not correspond to those expected.

Other objects of the present invention can be understood through the following detailed description:

The present invention provides a device for packaging at least one cosmetic product, the device comprising:

i) at least one first chamber for containing said product;

ii) a second chamber connected to said first chamber by a channel;

iii) an at least partially resiliently compressible member mounted on said channel formed by said device; and

iv) means capable of exerting pressure on at least a portion of said resiliently compressible member under manual control, said pressure being applied in at least two opposite directions, so as to cause a reduction in the volume of said compressible member, thereby at least partially releasing said aisle,

It is characterized in that the part is held inside the cylindrical part of the channel by a small pressure prior to manual control.

The term "fluid" means either "hydraulic" (liquid) or "pneumatic" (air).

Said channel may be a channel located upstream of the dispensing orifice of the device, which channel must remain sealed, with the best possible seal, at times other than during dispensing of the product, in order to avoid any residual product located upstream of the dispensing orifice in the Dry or oxidize on exposure to air.

Alternatively, the channel may be a channel formed by the device between two chambers. According to this variant, the device forms a first chamber containing a first product, and a second chamber that may be arranged on at least a part of said first chamber and contains a second product, the second a partition member movable from a first position isolating said first product from said second product to a second position contacting said first product with a second product, the means may be designed to The volume reduction of the part due to the pressure acting on the interior of one and/or the other of the first and second chambers, in particular a multi-directional volume reduction, causes the first insulating part to move from the Movement of the passage from the first position to the second position creates a corresponding pressure balance between said first and second chambers.

Thus, the separating element is such that it ensures a physical separation of the two products. On the other hand, it must be able to achieve the balance of pressure.

In practice, the lower the degree of sealing required to ensure the physical separation of the two products, the lower the pressure that needs to be generated and the more comfortable to operate. To this end, at least the product contained in the second chamber is preferably in powder form, and it is arranged on the separating part when said second chamber is located above the first chamber. Whereas said other products may in particular be in liquid form.

As a result of this design of the device, the generation of the mixture is particularly easy to achieve.

In particular, when hydraulic pressure is applied in a substantially uniform manner on the free surface of said dividing member, a small pressure is sufficient to cause the channel of the device to move from the first position to the second position.

This design differs from the type of system disclosed in patent EP0606429, in which the spacer plug is forced to move by pressure applied in a multi-layered manner, said pressure also being transmitted through a product located between said spacer plug and the pressure piston . This pressure on the product trapped between the spacer plug and the piston can be detrimental to the product, especially if the product is a powder.

The reduction in volume preferably results in a reduction in the surface area of said first separating member in a direction perpendicular to the longitudinal axis of the device, as well as in its entire axial direction. Thus, in the first position, the divider has a sufficiently large diameter to be held in place by a small clamping force despite the weight of the second product mounted on top of the divider. According to the pressure applied in multiple directions, the partition member is compressed towards its axis in all directions, especially in the radial direction. As a result of this compression, it can no longer grip and, under the combined action of its weight and the weight of the second product, the dividing member descends with the second product into the first container. The two products can then come into contact with each other.

For a separating element with a circular cross-section, a reduction in its diameter of several tens of millimeters is sufficient to achieve this result.

In practice, a small reduction in the axial height of the partition member is also found when the pressure exerted on said partition member is distributed substantially over its entire outer surface. In the latter case, the reduction in volume is multidirectional. The partition member is made of a material that can shrink under pressure, and thus can be reduced in size.

Said pressure is preferably generated in the first chamber when the first chamber is located below the second chamber, the height of the first product contained in the first chamber is such that between the first product and the The height of the first product is passable from the first position to the second position before the contact of the first separating member. The pressure exerted on the partition member is pneumatic pressure.

Alternatively, the pressure may be applied to a chamber disposed on top of another chamber. If the product contained in the top chamber is in liquid form and its density is greater than the material from which the partition is produced, under pressure the partition shrinks in volume and can no longer remain in the separation of the two chambers position. When the liquid mixes with the product contained in the other chamber, the dividing member rises to the surface of the liquid. In this case, the pressure exerted on the partition member is hydraulic pressure.

Said first partition member preferably comprises at least partly a member made of a material elastically compressible in response to said pressure and at least part of its outer surface area is impermeable. "Impermeable" means impermeable to pressurized fluids, especially air.

The material is more preferably a foamed material with closed cells. Specifically, it may be polyethylene, polyester or polyurethane foam.

In said second position, said first dividing member preferably floats on the surface of the mixture, so that said dividing member does not interfere with the dispensing of said mixture.

As mentioned above, prior to said pressurization, said first partition member is preferably mounted inside the channel formed by said first and second chambers by partial compression in at least one direction perpendicular to said channel Retained in said first position, in contact with the inner surface forming said channel. Despite a small compression of the partition member, air can pass between the side surface of the partition member and the inner surface of the channel so that an equalization of pressure can be obtained.

When the pressures have reached equilibrium, the pressure of the first chamber and the pressure of the second chamber are substantially the same and each has an excess pressure relative to the initial pressure of the chambers. The separating part installed between these two chambers is thus compressed in at least two opposite directions, for example, said pressure is exerted on at least two opposing surfaces of the part which are to come into contact with the inner surface of said channel .

According to a preferred embodiment, at least one wall forming one and/or the other of said first and second chambers is elastically deformable so that it can act on said elastically deformable The pressure on the wall creates the compression.

More particularly, at least a part of one and/or the other of said first and second chambers can form a bellows. In this case, the pressure to be applied is axial.

In addition, the chamber inside which the pressure is generated is formed by a container with elastically compressible walls. In this case, the pressure to be applied is perpendicular to the axial direction.

According to a particular embodiment, said first chamber is formed by a first container and the second chamber is formed by a second container, which can be mounted on the first container, in particular by means of screws Or fasten with snap buttons.

The second container includes an opening separated from the second product by the first dividing member when the first dividing member is in the first position.

Preferably, before mounting the second container on the first container, said opening is insulated in a removable manner by a cover, in particular in the form of a plug, in particular a screw cap.

Means are provided for maintaining the dividing member in a fixed position prior to mounting the second container on the first container.

The fixtures may include:

i) in one aspect, a part of said stopper;

ii) On the other hand, axial blocking means located in the vicinity of the first partition member opposite said plug.

Thus, when the stopper is mounted on the second container, it fixes the partition member from the axial direction. Once the bung is removed, the second product is retained in the second container by the dividing member when the second container is mounted on top of the first container.

Said second chamber is preferably formed by an element forming an applicator head for mixing said product.

Said second chamber is preferably able to communicate with a dispensing orifice which is isolated prior to mixing by a cover part, in particular a sealing part in the form of a self-destructing part.

According to another embodiment, the device forms a third chamber at least partially mountable on top of the second chamber and contains a third product, said first, second and third products being produced by said The first partition member and the second partition member are spaced two by two. Said first and second dividing members are each movable from a first position in which said first, second and third products are isolated in pairs to a second position in which these three products are in contact with each other, due to said The multidirectional reduction in the volume of the first and second partition members caused by the pressure generated inside one and/or the other of the first, second and third chambers results in the first and second Movement of the second dividing member from said first position to the second position creates a corresponding pressure equalization between the chambers they separate from each other.

The mixing is preferably achieved by positioning the device such that the second chamber is on top of the first chamber and the third chamber is on top of the second chamber, and the first chamber room pressure.

Said second and third products may be packaged separately in the same container, in particular in an applicator tip.

Products installed in chambers other than the chamber in which the pressure is to be generated are preferably in powder form. Thus, the first product may be an oxidizing agent in liquid form. The second product can be a colorant in powder form. The third product may be a fragrance composition, also in powder form.

According to another aspect, the present application relates to a device for temporarily mixing at least two products, which device forms a first chamber containing a first product, and is capable of being mounted at least partially on top of the first chamber and containing A second chamber for a second product, a first separation capable of moving from a first position separating said first product and second product to a second position bringing said first product and second product into contact The device is designed to move said first dividing member from a first position to a second position when pressure is generated in one or the other of said first and second chambers. When the partition member moves from the first position to the second position, it moves in the direction of the chamber inside which the pressure is generated.

As mentioned above, the device according to the invention is used to produce a mixture for forming cosmetic components, in particular for hair coloring.

Description of drawings

In addition to the above-mentioned designs, the present invention also includes other designs, which are described below in conjunction with non-limiting embodiments, which are illustrated in conjunction with the accompanying drawings, wherein:

- Figure 1 is an exploded schematic view of a device according to a first embodiment of the invention;

- Figure 2 is a sectional view of the device shown in Figure 1;

- Figures 3A-3F represent the main stages of operation of the device shown in Figures 1 and 2;

- Figure 4 is a sectional view of a device according to a second embodiment of the invention; and

- Figures 5A-5D represent the main stages of operation of the device shown in Figure 4 .

Detailed ways

The device 1 shown in FIGS. 1 and 2 comprises a container 2 ending in a bottom 3 at one end. A part 4 of the container body close to the bottom 3 is designed in the form of a bellows. The container 2 forms an enclosure 9 for containing the coloring oxidizing agent in liquid form.

The end of the container opposite the bottom 3 terminates in a threaded neck 5 forming a hole 6 .

The container 2 is obtained by extrusion blow molding polyethylene or polypropylene.

In the storage and/or transport state of the device 1 , the container 2 is sealed by a stopper 7 , the inner surface of which comprises threads capable of cooperating with the threads of the neck 5 . The plug 7 comprises a sealing skirt 8 in conventional manner.

The device 1 also includes an applicator head 10 .

The applicator head 10 comprises an elongated hollow part, a part 11 of which has a cross-section that decreases in the direction of an opening with a lower cross-section 19 , which is sealed by a self-destructive head 40 .

Near the end of applicator head 10 opposite self-destructive head 40 , applicator head 10 comprises a first cylindrical portion 13 having a diameter greater than the largest diameter of portion 11 and separated from portion 11 by a shoulder 14 .

In the vicinity of the first cylindrical portion 13 , opposite the portion 11 , the applicator head 10 forms a second cylindrical portion 15 , the inner diameter of which is greater than the inner diameter of the first cylindrical portion 13 . The free edge of the cylindrical part 15 forms an opening 45 for the applicator head 10 .

The second cylindrical portion 15 is separated from the first cylindrical portion 13 by a shoulder 16 .

The inner surface of the cylindrical portion 15 includes threads 17 . Inside the cylindrical portion 15 is formed a sealing skirt 18 which extends axially from the shoulder 16 in the direction of the end of the head 10 opposite the self-breaking head 40 .

The applicator head 10 is obtained by injection of a rigid thermoplastic material such as polyamide, polystyrene, polycarbonate, polypropylene, propylene butadiene styrene (ABS) or acrylonitrile polystyrene (ANS).

After introducing the coloring powder into the housing 12 formed by the part 11 of the applicator head, a closed-cell polyurethane foam block 20 is placed inside the cylindrical part 13 . The foam mass 20 has substantially the same height as the cylindrical part 13 . The movement of inserting the foam mass into the interior of the applicator head 10 is limited by the presence of the shoulder 14 on which the surface 21 of the foam mass 20 rests.

At rest, the foam mass 20 has a diameter slightly larger than the inner diameter of the cylindrical portion 13 so that it can be slightly compressed laterally inside the cylindrical portion 13 . The degree of compression is sufficient for the foam mass 20 to hold itself inside the cylindrical portion 13 despite the weight of the powder located in the portion 11 of the applicator head 10 .

During storage and/or transport, the end of the applicator head 10 is sealed by a plug 30 , the outer surface of which has threads 31 capable of cooperating with the threads 17 of the applicator head 10 . The transverse wall 32 of the stopper 30 is designed to be substantially in contact with the surface 22 of the foam mass opposite the surface 21 .

The bung 30 is accessible by an outer wall 33 concentric with the circular wall on which the thread 31 is formed.

The function of the device 1 just disclosed will now be described with reference to Figures 3A-3F.

In Fig. 3A, the stopper 7 of the container 2 has been removed. The stopper 30 of the applicator head 10 has been removed. Even in the head-up position, despite the weight of the powder, the foam mass 20 is held inside the cylindrical part 13 of the applicator head 10 by a small pressure, with the result that the powder is kept inside the housing 12 .

In FIG. 3B , the applicator head 10 is screwed onto the container 2 .

In Figure 3C, axial pressure is applied to the bottom 3 of the container 2 to axially compress the portion 4, forming a bellows. As a result, pressure builds up in container 2 . Due to the lack of an airtight seal around the foam mass 20 , a pressure equalization is obtained between the housing 9 and the housing 12 . The result of this is that the pressure is applied in a substantially uniform manner over the entire outer surface of the foam mass 20 . This compresses in a multi-directional fashion. This results in particular in reducing its outer diameter, so small that it can no longer remain inside the cylindrical portion 13 . It then falls under the combined effect of its weight and the weight of the powder contained in the housing 12 .

In FIG. 3D the above two products are mixed inside container 2 . Foam pieces 20 float on the surface of the mixture. This mixture can be mixed in a suitable manner by stirring the device 1 .

In FIG. 3E the opening 19 of the applicator head 10 is released from the breaking head 40 by breaking.

In FIG. 3F , the mixture is applied to the hair in a conventional manner by means of the portion forming the bellows 4 , so that the discharged mixture settles through the opening 19 .

This is advantageous if it is desired to use the device described above with two liquids.

i) An annular rib (not shown) is provided on the inner surface of the shoulder 14 to reduce the formation of a liquid film between the side surface of the foam block 20 and the inner surface of the cylindrical portion 13 before using the device. the danger of; and

ii) Mixing is performed with the device head down, since the material forming the foam mass 20 has a lower density than the liquid contained in the container 2 .

The difference between the embodiment shown in Figure 4 to be disclosed below and the above-mentioned embodiment mainly lies in:

1) the container 2 has a wall that is elastically deformable in a direction substantially perpendicular to the axis X according to the pressure exerted on the container; and

II) The applicator head 10 generally has another cylindrical part 41 in the middle between the cylindrical part 13 of the applicator head 10 and the self-destructive head 40 , the inner diameter of which is slightly smaller than the inner diameter of the cylindrical part 13 . The cylindrical portion 41 is separated from the portion adjacent to the applicator head of the self-destructive member 40 by an annular shoulder 42 . Inside the tubular part 41 is mounted a foam block 50 similar to the foam block 20 , which face 51 has an axial stop against the shoulder 42 . The foam block 20 thus separates the chamber 9 formed by the container 2 from the chamber 12 formed at the bottom of the applicator head 10 in the mounted state of the applicator head 10 in the container 2 . The foam block 50 separates the chamber 12 from the chamber 43 formed by the top of the applicator head. Chamber 9 contains a coloring oxidizing agent in liquid form. Chamber 12 contains colorant in powder form. Chamber 43 contains fragrance in powder form.

The remainder of the device is similar to that disclosed in connection with the above embodiments. Therefore, a detailed description of these parts will not be given here.

On initial use, the process is as described for the first embodiment disclosed in connection with Figures 3A and 3B.

The remainder of the method is illustrated in conjunction with Figures 5A-5D, which are described below.

In FIG. 5A , the chamber 9 is compressed according to the pressure exerted laterally on the deformable wall of the container 2 . The result is a pressure build-up inside the container 2 . Due to the lack of an airtight seal around the foam mass 20 and foam mass 50, a pressure equalization is established between the shells 9, 12 and 43 almost immediately. As a result, said pressure is applied in a substantially uniform manner over the entire outer surface of the foam pieces 20 and 50 . The compression is performed in a multi-directional fashion. This results in particular in a reduction in their external diameter, sufficiently that they can no longer remain inside their respective cylindrical parts 13 and 41 . They then fall under the combined effect of their weight and the weight of the powder contained in the housings 12 and 43 respectively.

In practice, the two foam pieces are dropped slightly in succession, the foam piece 20 being dropped before the foam piece 50 .

In FIG. 5B , the three products are present in a mixture inside the housing 9 . Foam pieces 20 and 50 float on the surface of the mixture. The mixture is then mixed in a suitable manner by stirring the device 1 .

In FIG. 5C , the opening 19 of the applicator head 10 is released by breaking from the breaking head 40 .

In FIG. 5D , the mixture is applied to the hair in a conventional manner by applying pressure to the deformable body 2 so as to allow the expelled mixture to settle through the opening 19 .

In the foregoing detailed description, there have been described preferred embodiments of the invention. It is obvious that changes may be made in the described embodiments without departing from the spirit of the invention as defined in the following claims.

Claims (22)

1. A device (1) for packaging at least one cosmetic product, the device comprising: i) at least one first chamber (9) for containing said product; ii) a second chamber (12) connected to said first chamber by a channel (13); iii) an at least partially resiliently compressible member (20) mounted on said channel (13) formed by said device; and iv) means (2, 3) capable of exerting pressure on at least a part of said elastically compressible member (20) according to manual control, said pressure being applied in at least two opposite directions so as to cause a reduction in the volume of said compressible member , thereby at least partially releasing the channel, It is characterized in that said elastically compressible member (20) is held inside the cylindrical portion of said channel (13) by a slight compression of said elastically compressible member prior to manual control. 2. The device (1) as claimed in claim 1, characterized in that: a) the device forms a first chamber (9) containing a first product, and a second chamber (12) which may be arranged at least partly above said first chamber and contains a second product ; b) said resiliently compressible member forms a first separating member (20) movable from a first position isolating said first and second products to a position bringing said first and second products into contact In the second position, the device is designed according to the pressure on the inside of one and/or the other of the first and second chambers (9, 12) caused by said first partition member (20) The multi-directional volume reduction resulting in a corresponding pressure balance between the first and second chambers is caused by moving the first isolation member (20) from the first position to the second position. 3. The device (1) as claimed in claim 1 or 2, characterized in that the reduction of the volume of the compressible member (20) can at least cause the elastic compressible member (20) to move in a direction perpendicular to the axial direction of the passage (13). The reduction in the surface area of the cross-section. 4. The device (1) as claimed in claim 2, characterized in that it is designed so that when the first chamber (9) is lower than the second chamber (12), the first partition member (20) acts on The pressure inside the first chamber (9) causes the first spacer to move from the first position to the second position, the height of the first product in the first chamber (9) is such that , that is, the movement from the first position to the second position is performed before said first product comes into contact with said first partition member (20). 5. The device (1) according to claim 1, characterized in that the elastically compressible means (20) has an outer surface area which is at least partially impermeable. 6. The device (1) according to claim 5, characterized in that said elastically compressible means (20) is at least partially made of a foamed material having closed cells. 7. The device (1) as claimed in claim 6, characterized in that the foamed material with closed cells is polyethylene, polyester or polyurethane foam. 8. Apparatus (1) according to claim 2, characterized in that in said second position the first separating member (20) floats on the surface of said mixture. 9. The device (1) according to claim 2, characterized in that a first partition member (20) is installed inside said channel (13) formed by the first chamber and the second chamber, and before said compression , held in said first position by partial compression in at least one direction perpendicular to said channel, in contact with an inner surface forming said channel. 10. Apparatus (1) as claimed in claim 1, characterized in that at least one of the walls forming said chamber (9, 12) or one of said chambers is elastically deformable so as to be able to The compression is caused by pressure exerted on the elastically deformable wall. 11. Device (1) according to claim 1, characterized in that at least a part of said chambers (9, 12) or one of said chambers forms a bellows. 12. The device (1) as claimed in claim 2, characterized in that the first chamber (9) is formed by the first container (2), and the second chamber (12) is formed by the second container (10) Yes, the second chamber can be threaded or snapped onto the first chamber. 13. The device (1) as claimed in claim 12, characterized in that the second container (10) comprises an opening (45), when the first partition member (20) is in the first position, the first partition member (20) ) separates the opening from the second product. 14. Device (1) according to claim 13, characterized in that said opening (45) is movably isolated by a cover plate (30) in the form of a plug or screw cap before the second container is mounted on the first container of. 15. Apparatus (1) as claimed in claim 13 or 14, characterized in that before the second container (10) is mounted on the first container (2), means (14, 32) are provided for holding said separating member (20) IN STATION. 16. The device (1) as claimed in claim 15, characterized in that said fixing device comprises i) on the one hand, a part (32) of said stopper (30), and ii) On the other hand, axial blocking means (14) opposite said plug (30) next to the first partition part (20). 17. Device (1) according to claim 2, characterized in that the second chamber (12) is formed by a part (10) constituting an applicator head for mixing said product. 18. Device (1) according to claim 17, characterized in that said second chamber can communicate with a dispensing orifice (19) which is isolated before mixing by a self-destructive cover part (40). 19. The device (1) according to claim 1, characterized in that said device forms a third chamber (43) at least partially mountable on top of the second chamber (12) and containing a third product, The first, second and third products are separated two by two by the first partition member (20) and the second partition member (50), and the first and second partition members (20, 50) Can each be moved from a first position in which pairs of said first, second and third products are isolated to a second position in which these three products are in contact with each other, since in said first, second and third cavities The multidirectional reduction in the volume of said first and second partition members (20, 50) caused by the pressure generated inside one and/or the other of the chambers (9, 12, 43) results in said Movement of the first and second dividing members from said first position to the second position creates a corresponding pressure equalization between the chambers they respectively divide. 20. The device (1) according to claim 2, characterized in that the chambers (12, 43) other than the chamber (9) in which the compression is generated inside contain the product in powder form. 21. A device (1) for temporarily mixing at least two products, which device forms a first chamber (9) containing a first product, and can be at least partially mounted on top of the first chamber and contains a second A second chamber (12) for a product, movable from a first position separating said first and second products to a second position in which said first and second products are in contact. a partition member (20), said first partition member (20) being held in said first position by a small pressure inside a cylindrical portion of the passageway defined between the first and second chambers, the device is designed to move said first partition member (20) from a first position to a second position when pressure is generated in one or the other of said first and second chambers, when said partition member When moving from the first position to the second position, the partition member moves towards the chamber in which the pressure is generated. 22. Use of the device (1) according to any one of the preceding claims for the production of a mixture for forming cosmetic components for hair coloring.

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