EP0269068B1 - Aerosol package - Google Patents

Abstract

The aerosol container has two separate chambers (11, 12) for different components (A, B) which are to be mixed during use, the two chambers (11, 12) being arranged one above the other and being connected to each other by a connection channel (21), which can be opened during use, in such a way that the opening of the connection channel (21) can be produced by mechanical movement of the chambers (11, 12) relative to each other, and a discharge valve (13), which can be actuated independently, being assigned to the upper chamber (11). In order to be able to construct the lower chamber more easily, the latter is filled with a first component (A), in particular hydrogen peroxide, and a first propellant (T1), in particular butane, propane or the like, and the upper chamber (11) is filled with a second component (B), in particular hair dye or the like, and a second propellant (T2). Said propellant (T2) causes a smaller pressure, which is sufficient for discharging the component mixture through the discharge valve (13), inside the upper chamber (11) than the propellant (T1) in the lower chamber (12). The purpose of the latter propellant is merely to press the first component (A) out of the lower chamber (12) into the upper chamber (11), mixing it with the second component (B), when the connection channel (21) which is common to both chambers (11, 12) is opened. Finally, the connection channel (21), consisting of only three plastic components, is also of importance. <IMAGE>

Description

The invention relates to an aerosol packaging with two separate chambers for different components to be mixed in use according to the preamble of claim 1.

From US-A-3 181 737 an aerosol packaging with two separate chambers is known, which are provided for different components to be mixed during use. The two chambers are arranged one above the other and connected to one another by a connection channel that can be opened in use such that the opening of the connection channel can be produced by mechanically moving the chambers toward one another. The connecting channel includes a plunger with an axially extending fluid passage. When the chambers are used or mechanically moved against one another, the plunger is displaceable relative to a bottom closure of the upper chamber and relative to a lid closure of the lower chamber, to be precise in establishing the fluid connection between the upper and the lower chamber. Furthermore, an independently operated dispensing valve is assigned to the upper chamber. While the lower chamber is filled with a first component and a first blowing agent, a second component and second blowing agent are introduced into the upper chamber. The second blowing agent causes a lower pressure within the upper chamber than the first blowing agent filled into the lower chamber, through which when the connection channel common to both chambers is opened, the first component can be pressed into the upper chamber from the lower chamber while mixing with the second component. To this extent, this known aerosol packaging comprises a mother-daughter valve arrangement which connects the two chambers to one another, both the mother valve and the daughter valve each being conventional aerosol check valves.

The lower chamber is usually filled with hydrogen peroxide and a blowing agent, so that the lower chamber must be permanently pressure-resistant and resistant to pressure.

Under these conditions, the known mother-daughter valve arrangement of this known aerosol packaging is extremely disadvantageous. So the mother-daughter valve assembly includes a variety of individual components, such as valve body, stem, check valve balls, helical compression springs, sheet metal surrounds, separate sealing rings, etc. On the one hand, these parts are highly sensitive to the hydrogen peroxide located in the lower chamber. Practice has shown that the first signs of decomposition can be observed in the valve area after only three to four months of storage. Accordingly, leakages that make the entire system unusable cannot be prevented in the event of a longer storage time. In addition, the hydrogen peroxide stored in the lower chamber decomposes into water and oxygen after some time. This also increases the pressure in the lower chamber, which further promotes leakage. In addition, the corrosion on the valve parts mentioned, in particular on the valve parts made of metal, is promoted to a very considerable extent in this way. On the other hand, due to the large number of individual parts, it is not guaranteed that the fluid seal is absolutely fluid-tight from the environment even before use. The fluid seal alone depends on the accuracy of fit of the two tappet sections within the respectively assigned base closure or cover closure and on the effectiveness from the compression springs assigned to the two tappet sections. However, these are particularly susceptible to aggressive container fillings.

Finally, the lower chamber in this known aerosol packaging must be under such a high pressure that, on the one hand, the component stored in the lower chamber, when the connecting channel between the two chambers is opened, is pressed into the upper chamber by mixing with the component stored in the upper chamber and on the other hand the mixture is discharged from the upper chamber to a sufficient extent. The lower chamber must therefore be built to be extremely pressure-resistant. The same requirements apply to the above-mentioned mother-daughter valve arrangement, wherein - as stated - practice has shown that the mother-daughter valve arrangement of this known aerosol packaging does not meet these requirements perfectly.

The present task is therefore based on the task of developing an aerosol packaging of the generic type in such a way that the lower chamber can be under a lower pressure while the functionality and safety are unchanged, while at the same time being both structurally and assembly-technically much simpler , extremely corrosion-resistant and absolutely leakproof fluid connection between the two chambers can be achieved before use.

This object is achieved by the characterizing features of patent claim 1.

In this way it is possible to build up a pressure in the lower chamber which is just sufficient to press the component stored in the lower chamber, in particular hydrogen peroxide, into the upper chamber after opening the connecting channel between the two chambers. The two components are then mixed there. The discharge of the component mixture from the upper chamber from the conventional aerosol check valve then takes place under a lower pressure which is caused by the propellant filled into the upper chamber. In addition, the construction according to the invention is characterized by a one-piece tappet, the bottom closure and the lid closure by an extremely simple, uncomplicated construction. Finally, the characteristic measures ensure that the interior of the aerosol packaging according to the invention is absolutely fluid-tight to the environment before use and also remains in place until first use.

The pressure ratios are preferably selected in accordance with claim 4. Furthermore, the blowing agent filled into the upper chamber for discharging the component mixture is at the same time a foaming agent. This dual function cannot easily be imparted to a propellant filled in the lower chamber. This is not least due to the chemical reactivity of the hydrogen peroxide, which is usually filled into the lower chamber.

Advantageous refinements of the aerosol packaging according to the invention are also described in the further subclaims.

• minimale Anzahl von Einzel-Bauteilen (Stößel mit axialem Fluiddurchgang; zwei dem Stößel zugeordnete Verschlußkappen);
• sämtliche Einzel-Bauteile können aus widerstandsfähigen Kunststoff hergestellt werden;
• minimaler Montageaufwand;
• höchste Dichtigkeit;
• hohe Funktionssicherheit, insbesondere keine Gefahr einer versehentlichen Trennung der beiden Kammern durch die Maßnahmen nach den Ansprüchen 11 und 12;
• einfachste Gestaltung der Bauteile für den Verbindungskanal zwischen den beiden Kammern.

Regardless of the type of filling of the two chambers, but also in combination with it, the inventive design of the connecting channel between the two chambers offers a number of technical advantages, namely:

• minimal number of individual components (plunger with axial fluid passage; two sealing caps assigned to the plunger);
• all individual components can be made from resistant plastic;
• minimal installation effort;
• highest tightness;
• high functional reliability, in particular no risk of inadvertent separation of the two chambers by the measures according to claims 11 and 12;
• simplest design of the components for the connecting channel between the two chambers.

With regard to preferred structural details of the connecting channel and the locking mechanism, reference is made to claims 6 to 12; with regard to advantageous handling of the packaging to claims 13 and 14.

Fig. 1

eine erfindungsgemäß ausgebildete Aerosol-Verpakkung im schematischen Längsschnitt, und zwar vor Gebrauch;

Fig. 2

den Verbindungskanal zwischen oberer und unterer Kammer der Aerosol-Verpackung nach Fig. 1 im Längsschnitt und in vergrößerten Maßstab, und zwar vor Gebrauch;

Fig. 3

den Verbindungskanal entsprechend der Darstellung nach Fig. 2 nach Herstellung eines Fluiddurchgangs, d. h. nach Öffnung desselben, ebenfalls in vergrößertem Maßstab;

Fig. 4a, 4b

eine Abwandlung des Verbindungskanales im Längsschnitt und vergrößerten Maßstab sowie vor und beim Gebrauch der Aerosol-Verpackung;

Fig. 5

einen Teil der Aerosol-Verpackung nach Fig. 1 in Längsschnitt und vergrößerten Maßstab unter Darstellung eines Zahnrichtgesperres zwischen oberer und unterer Kammer;

Fig. 6

einen Schnitt längs Linie VIII-VIII in Fig. 5 im Bereich des Zahnrichtgesperres;

Fig. 7

einen Teil einer abgewandelten Ausführungsform einer Aerosol-Verpackung entsprechend der Darstellung nach Fig. 5; und

Fig. 8

einen Schnitt längs Linie X-X in Fig. 7 unter entsprechender Darstellung eines abgewandelten Zahnrichtgesperres.

Embodiments of the aerosol packaging according to the invention are explained in more detail below with reference to the attached drawing. Show it:

Fig. 1

an aerosol packaging designed according to the invention in a schematic longitudinal section, namely before use;

Fig. 2

the connecting channel between the upper and lower chamber of the aerosol packaging according to Figure 1 in longitudinal section and on an enlarged scale, before use;

Fig. 3

the connection channel according to the representation of Figure 2 after establishing a fluid passage, ie after opening the same, also on an enlarged scale.

4a, 4b

a modification of the connecting channel in longitudinal section and enlarged scale and before and when using the aerosol packaging;

Fig. 5

a part of the aerosol packaging of Figure 1 in longitudinal section and enlarged scale showing a Zahnrichtgesperres between upper and lower chamber.

Fig. 6

a section along line VIII-VIII in Figure 5 in the area of the Zahnrichtgesperres.

Fig. 7

a part of a modified embodiment of an aerosol packaging according to the illustration of FIG. 5; and

Fig. 8

a section along line XX in Fig. 7 with a corresponding representation of a modified Zahnrichtgesperres.

The embodiment shown schematically in longitudinal section in FIG. 1 of an aerosol packaging designed according to the invention consists of an upper chamber 11 and a lower chamber 12. The upper chamber 11 has a head valve 13 of conventional type (aerosol dispensing valve) and a bottom opening in the pot-like cap 14 is used in a fluid-tight manner. The lower chamber 12 has at its top an opening 15 (here bottle-like opening) into which a pot-like cap 16 is also inserted in a fluid-tight manner. The caps 14, 16 thus have axial recesses, the openings in the assembled state of the packaging face each other and are aligned with one another in the assembled state of the packaging. In Figures 2 and 3, the axially extending recesses of the caps 14, 16 are identified by the reference numerals 17 and 18, respectively.

The lower chamber 12 is arranged within a pot-like container 19 which can be screwed into a sleeve-like extension 20 arranged on the underside of the upper chamber 11 such that the upper and lower chambers can be moved relative to one another by opening a connecting channel 21 to be described in more detail below between the upper and lower chamber. The sleeve-like extension can be an integral part of the upper chamber 11. In Fig. 1, the sleeve-like extension 20 is, however, a separate component, preferably made of plastic, which can be snapped into place at the lower peripheral edge 22 of the upper chamber. The outer circumferential surface of the sleeve-like extension 20 is flush with the outer circumferential surface of the upper chamber 11, so that the impression of a downwardly continued upper chamber 11 is given. In order to facilitate screwing the container 19 receiving the lower chamber 12 into the sleeve-like extension 20, the container 19 is provided with knurling or corrugation 23 along the lower outer circumference. The screw connection between the container 19 and the sleeve-like extension 20 is identified in FIG. 1 by the reference number 24. The container 19 is preferably also made of plastic. The circumferential surface of the part of the container 19 protruding from the sleeve-like extension 20 is flush with the peripheral surface 19 of the sleeve-like extension 20. This gives the impression that the aerosol packaging described is a one-piece aerosol can.

The aforementioned connection channel 21 between the upper Chamber 11 and lower chamber 12 is formed by a plunger 25 with an axially extending fluid passage 26, the upper end 27 of the plunger 25 within the correspondingly dimensioned axial recess 17 of the first closure cap 14 inserted in the bottom 28 of the upper chamber 11 in a fluid-tight manner and the lower one End 29 of the plunger 25 within the correspondingly dimensioned axial recess 18 of the second closure cap 16 inserted into the opening 15 of the lower chamber 12 in a fluid-tight manner is axially displaceable and is fluid-tight relative to the surroundings. As a result, when the chambers 11 and 12 move mechanically against each other through the upper and lower ends 27 and 29 of the plunger 25 defining the connecting channel 21, the bottom walls 30 and 31 of the closure caps 14 and 12, respectively, which are located inside the chambers 11 and 12, respectively. 16 openable, namely breakable while simultaneously establishing a fluid connection between the upper and lower chamber through the fluid passage 26. On the inside of the closure cap 16, a riser pipe 32 is formed which extends to the bottom of the lower chamber 12. The riser pipe 32 and the closure cap 16 thus form a one-piece component, which considerably simplifies production compared to the previous designs. The bottom walls 30, 31 of the caps 14, 16 are membrane-like with a predetermined breaking point. In the exemplary embodiment shown, the predetermined breaking point is in each case formed by a material weakening 33 or 34 extending over the circumference of the bottom walls 30, 31 (see FIG. 2). 1 and 2 show the state of the connecting channel before the aerosol packaging is used, while FIG. 3 shows the connecting channel 21 in its open position, ie with the bottom walls 30, 31 of the closure caps 14, 16. The fluid connection between the lower chamber 12 and upper chamber 11 is in Fig. 3 with the arrows 35 indicated.

When the lower container 19 is screwed into the sleeve-like extension 20, the upper and lower chambers are moved towards one another until the plunger ends 27, 29 come into contact with the bottom walls 30, 31 of the closure caps 14, 16 which are moved towards one another. When the upper and lower chambers move further against each other, the bottom walls 30, 31 are then broken open by the tappet ends 27, 29 according to FIG. 3. The end faces 36, 37 of the tappet 25 are each inclined relative to the longitudinal central axis thereof, so that a kind of "membrane cutting edge" "38 arises. Furthermore, the end faces 36, 37 of the plunger 25 defining the connecting channel 21 each have a groove 39 and 40, which extends transversely across the end face and crosses the axial fluid passage 26, in order to ensure the fluid connection between the two chambers 11 and 12, even only partially Opening of the broken bottom walls 30, 31.

As can also be seen in FIGS. 1 to 3, a stop which is effective both in relation to the lower and in relation to the upper chamber is formed on the plunger 25 in the form of an approximately half-length ring flange 41 which extends over the circumference of the plunger 25 , which at the same time limits the mutual movement of the upper and lower chamber and which at the same time ensures that when the upper and lower chamber move against each other both caps 14, 16 are broken open.

In order to ensure a fluid seal in the position of use according to FIG. 3 with respect to the environment or between the plunger 25 on the one hand and the axial recesses 17 and 18 of the closure caps 14, 16 on the other the central region 42 of the plunger 25 arranged between the two plunger ends 27, 29 has an outer diameter which is somewhat larger than the inner diameter of the axial recesses 17, 18 in the two closure caps 14 and 16. The plunger 25 is thus moved when the two chambers 11 move against one another and 12 pressed into the axial recesses 17, 18 of the closure caps 14, 16 assigned to the two chambers, forming an interference fit. For this purpose, the caps 14, 16 are made of resilient plastic material.

In the embodiment shown in Fig. 1, the lower chamber 12 is filled with a first component A, in particular hydrogen peroxide, and a first blowing agent T₁, in particular butane, propane or the like, while the upper chamber 11 with a second component B, in particular a hair dye or the like, and a second blowing agent T₂ is filled. The latter causes a lower pressure within the upper chamber 11 than the propellant T 1 filled in the lower chamber. When the two chambers 11, 12 common connecting channel 21 is opened, the first component A is pressed out of the lower chamber 12 while mixing with the second component B into the upper chamber 11, namely by means of the propellant T 1 filled into the lower chamber. The propellant T₂ filled in the upper chamber is used only for discharging the component mixture from the upper chamber 11 through the discharge valve 13. In the upper chamber 11 there is preferably a pressure of about 1.8 bar, while in the lower chamber 12 a pressure of about 3.2 bar prevails. Freon is preferably used as the blowing agent T₂ in the upper chamber 11. This is also suitable as a foaming agent.

4a and 4b is a modification of the connecting channel 21 in a schematic longitudinal section and enlarged Scale shown, the figures indicated with the letter "a" show the state before opening and the figures indicated with the letter "b" show the state after opening of the connecting channel. 4a and 4b, parts that have already been described with reference to FIGS. 1 to 3 are provided with the same reference numerals. In this regard, reference is made to the description of FIGS. 1 to 3.

The embodiment according to FIGS. 4a, 4b differs from the above-described embodiment only with regard to the design of the closure cap 14 inserted in the bottom 28 of the upper chamber 11. The closure cap 14 shown there is characterized by an extension 45 projecting into the interior of the upper chamber 11 , the one at an axial distance from the closure membrane 30 has arranged opening 46, which can be closed by a ball 47 in the direction of the lower chamber 12. The ball 47 is held within a cage 48 provided with fluid openings. In this way, the closure membrane 14 also serves as a check valve.

5 to 8, a locking mechanism assigned to the two chambers 11, 12 will now be explained, which only allows the two chambers to move against one another, but not to move them apart. Here, too, parts that have already been described with reference to the preceding figures are provided with the same reference numbers. With regard to their function, reference is therefore made to the preceding description.

5 and 6 show a first embodiment of the locking mechanism mentioned. This embodiment is also shown in FIG. 1. It is a tooth lock, whereby the sleeve-like extension 20 rigidly connected to the upper chamber 11 is provided with an internal toothing 49, to which a plurality of pawls 50, which are distributed uniformly over the circumference, are assigned and which extend along the upper peripheral edge of the lower chamber 12 receiving container 19 are formed. The internal toothing is formed directly below the connection of the sleeve-like extension 20 on the lower peripheral edge 22 of the upper chamber 11. When the container 19 is screwed into the sleeve-like extension 20, the container 19 together with the lower chamber 12 is moved upwards or towards the upper chamber 11, the axial flaps 50 serving as pawls engaging in the internal toothing 49 after about one revolution such that the lower chamber 12 receiving container 19 can only be screwed further into the sleeve-like extension 20, ie in the direction of arrow 51 in FIG Turning back and thus moving the two chambers apart is no longer possible. This is prevented by the tooth alignment lock described, as can be seen particularly well in FIG. 6. The serving as pawls axial tabs 50 are an integral part of the container 19 such that they are resilient in the radial direction.

Also in the embodiment according to FIGS. 7 and 8, the locking mechanism is designed as a tooth lock. Otherwise, the embodiment according to FIGS. 7 and 8 also differs in that the lower chamber 12 is connected to the upper chamber 11. The lower chamber 12, like the preceding embodiments, is bottle-shaped, the bottle neck 52 having an external thread 53, which can be screwed into a corresponding internal thread 54, which is formed on a sleeve-like extension 55 surrounding the connecting channel 21 on the underside of the upper chamber 11. The sleeve-like extension 55 is part of a cover sleeve 56 fastened to the bottom 28 of the upper chamber 11 and receiving the lower chamber 12, the outer circumferential surface of which is flush with the outer circumferential surface of the upper chamber 11. Furthermore, an external toothing is provided on the bottle neck 52 in the region of the neck connection 57 formed, which is shown in cross section in Fig. 8. With this external toothing act several on the free (in Fig. 7 lower) end face of the sleeve-like extension 55 axial tab 58 together such that when the external teeth 57 and axial tab 58 mesh, the lower chamber 12 only in the sleeve-like extension 55 on the underside of the upper chamber 11 can be screwed. The screw connection can then no longer be loosened. The chambers 11 and 12 can therefore only be moved towards one another after the intermeshing of the external toothing 57 and the axial flap 58, but can no longer be moved apart. The axial lobes 58 are also how the axial flaps 50 in the embodiment according to FIGS. 5 and 6 are designed to be resilient in the radial direction.

In the embodiment according to FIGS. 7 and 8, the two chambers are moved towards one another by direct attack or direct action on the lower chamber 12. For this purpose, a handle 59 is arranged on the bottom of the lower chamber 12, by means of which the lower chamber 12 rotated relative to the upper chamber 11 and can thus be moved towards the upper chamber 11. Specifically, in the embodiment according to FIG. 7, the handle 59 is a cross bar 60 that can be rotatably attached to the lower chamber 12.

Instead of a tooth lock, a conventional clamp lock can also be used.

It is also conceivable to mechanically move the upper and lower chambers against each other by axially pressing against the action of an axially effective toothing or the like.

Claims (14)

1. An aerosol can having two separate chambers (11, 12) for different components (A, B) which have to be mixed for use, wherein

   a) the two chambers (11, 12) are disposed one above the other and are so interconnected by a connecting duct (21) which has to be opened for use, that the opening of the connecting duct (21) is possible by mechanical movement of the chambers (11, 12) towards one another, the connecting duct (21) containing a plunger (25) having an axially extending fluid passage (26) which, when the chambers (11, 12) move mechanically towards one another for use, is slidable relatively to a bottom closure (14) of the upper chamber (11) and relatively to a top closure (16) of the lower chamber (12) to establish the fluid connection between the upper and lower chambers,

   b) the upper chamber (11) has an associated independently actuated dispensing valve (13),

   c) the lower chamber (12) is filled with the first component (A) and a first propellant (T₁) and the upper chamber (11) is filled with the second component (B) and a second propellant (T₂), the latter producing a lower pressure inside the upper chamber (11) than the first propellant (T₁) introduced into the lower chamber, by means of which latter propellant the first component (A) can be forced out of the lower chamber (12) and into the upper chamber (11), mixing with the second component (B), on opening of the connecting duct (21) common to the two chambers (11, 12),
   characterised in that

   d) the plunger (25) is in one piece and the bottom closure associated with the plunger (25) and the top closure, also associated with the plunger (25), of the upper and lower chambers respectively are each formed by a closure cap (14, 16) with a closure diaphragm (30, 31; 43; 44) or the like which, when the chambers (11, 12) move mechanically towards one another, can be broken by the plunger ends (27, 29) and in that

   e) the two chambers (11, 12) have an associated locking mechanism which only allows the two chambers (11, 12) to move towards one another, but not apart.
2. A can according to claim 1, characterised in that the upper chamber (11) is subject to a propellant pressure sufficient to discharge through the dispensing valve (13) of the upper chamber (11) the component mixture which, after the fluid connection is established between the lower and upper chambers, forms in the latter.
3. A can according to claim 1 or 2, characterised in that the propellant in the upper chamber (11) is Freon and the propellant in the lower chamber (12) is butane, propane or the like.
4. A can according to any one of claims 1 to 3, characterised in that the pressure in the upper chamber (11) is between approximately 1.5 and 2.0, more particularly approximately 1.8 bar, and the pressure in the lower chamber (12) is approximately 2.8 to 3.6, more particularly approximately 3.2 bar.
5. A can according to any one of claims 1 to 4, characterised in that the propellant (T₂) in the upper chamber (11) is also a foam forming agent.
6. A can according to any one of claims 1 to 5, characterised in that the bottom wall (31) at least of one of the two closure caps (14 or 16) associated with the plunger (25) defining the connecting duct (21), more particularly the closure cap (16) associated with the lower chamber (12), is constructed as a breakable diaphragm having a predetermined breaking point (33, 34).
7. A can according to claim 6, characterised in that the closure cap (14) associated with the upper chamber (11) comprises a non-return valve openable only in the direction of the upper chamber (11), more particularly the bottom wall (30) of the closure cap (14) associated with the upper chamber (11) is itself constructed as a non-return valve which is to be opened only in the direction of the upper chamber, preferably in the form of a flap valve (43) or beak or lip valve (44).
8. A can according to any one of claims 1 to 7, characterised in that the end face (36, 37) at least of that end (27 and/or 29) of the plunger (25) defining the connecting duct (21), which is associated with a breakable bottom wall or diaphragm (30, 31) is inclined to the longitudinal centre-line of said plunger, more particularly to form a kind of "diaphragm knife edge (38)".
9. A can according to claim 8, characterised in that the or each end face of the plunger (25) defining the connecting duct comprises a groove (39, 40) extending across the end face and crossing the axial fluid passage (26) of the plunger (25) to ensure the fluid connection between the two chambers (11, 12) even if the bottom walls or diaphragms (30, 31) originally closing the axial recesses (17, 18) in the closure caps (14, 16) are only partially open.
10. A can according to any one of claims 1 to 9, characterised in that the plunger (25) defining the connecting duct (21) has a stop operative both with respect to the lower chamber (12) and with respect to the upper chamber (11), more particularly in the form of an annular flange (41) disposed over approximately half the length and extending over the periphery of the plunger (25), such flange at the same time limiting the movement of the upper and lower chambers (11 and 12) respectively towards one another.
11. A can according to any one of claims 1 to 10, characterised in that the locking mechanism is in the form of a silent ratchet or pawl and ratchet mechanism.
12. A can according to claim 11, characterised in that with a pawl and ratchet locking mechanism toothing, more particularly internal toothing (49), is formed on the upper chamber (11), more particularly on the underside thereof, with an associated pawl (50) disposed on the lower chamber (12), more particularly on the top thereof, or vice versa (external toothing (57) on the top of the lower chamber (12) with an associated pawl (58) on the underside of the upper chamber (11)).
13. A can according to one or more of claims 1 to 12, characterised in that the lower chamber (12) is movable towards the upper chamber (11), more particularly is pushable or screwable, either directly, i.e. through the direct agency of the user, or indirectly, more particularly inside a pot-shaped receiving container (19), together with the latter.
14. A can according to any one of claims 1 to 13, characterised in that the lower chamber (12) is disposed or mounted to be axially movable and rotatable relatively to and inside a continuation (20, 56) in the form of a sleeve disposed on the underside of the upper chamber (11), and hence relatively to the upper chamber (11).

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