EP3548185B1 - Fluid product dispenser - Google Patents

Description

The present invention relates to a fluid dispenser comprising a pump or a propellant gas aerosol equipped with a valve and a fluid dispenser head. The dispensing head can be integrated into, or mounted on, the pump or the propellant aerosol equipped with a valve The dispensing head can include a support surface so as to constitute a pusher on which the user presses to actuate the dispensing member. Alternatively, the dispensing head may be devoid of a bearing surface. This type of fluid product dispensing head is frequently used in the fields of perfumery, cosmetics or even pharmacy.

• un puits d'entrée destiné à être raccordé à une sortie d'un organe de distribution, tel qu'une pompe ou une valve,
• un logement de montage axial dans lequel s'étend une broche, définissant une paroi latérale et une paroi frontale, et
• un gicleur en forme de godet comprenant une paroi sensiblement cylindrique dont une extrémité est obturée par une paroi de pulvérisation formant un orifice de pulvérisation, le gicleur étant monté selon un axe X dans le logement de montage axial avec sa paroi cylindrique engagée autour de la broche et sa paroi de pulvérisation en butée axiale contre la paroi frontale de la broche.

A conventional dispensing head, for example of the pusher type, comprises:

• an inlet well intended to be connected to an outlet of a dispensing device, such as a pump or a valve,
• an axial mounting housing in which extends a pin, defining a side wall and a front wall, and
• a cup-shaped nozzle comprising a substantially cylindrical wall, one end of which is closed off by a spray wall forming a spray orifice, the nozzle being mounted along an X axis in the axial mounting housing with its cylindrical wall engaged around the spindle and its spray wall in axial abutment against the front wall of the spindle.

Typically, the inlet well is connected to the axial mount housing by a single supply conduit. On the other hand, it is common to form a swirl system at the spray nozzle wall. A swirl system conventionally comprises several tangential swirl channels which open into a swirl chamber centered on the nozzle spray orifice. The swirl system is arranged upstream of the spray orifice.

In the document FR2903328A1 , several embodiments of a nozzle are described comprising a spray wall pierced with several spray holes of substantially or perfectly identical diameter, of the order of 1 to 100 μm, with a tolerance of 20%. Such a spray wall would generate a spray whose droplet size is relatively homogeneous. Another realization is described in EP 1 878 507 A2 .

However, for certain fluid products, in particular in the field of perfumery, it has proven to be advantageous for the spray to have a more complex droplet size distribution, that is to say less homogeneous as a whole, making it possible to fill several distinct specific functions. For example, for a fluid product containing a fragrance, such as a perfume, it is advantageous for the spray to ensure on the one hand the deposition of droplets on the skin of the user and on the other hand the dispersion in the air. of olfactory compounds resulting from the rapid evaporation of the solvent part of very fine droplets. The deposit of droplets on the skin of the user must be perceived by the user so that he can be sure that perfume has reached the target, and this perception results in a feeling of humidity or "wetness" at the level skin. The dispersion of the olfactory compounds allows the user to smell or smell the top note of the fragrance so that he is sure of its effectiveness. Thus, these two perceptions, tactile and olfactory, must be provided by a single spray. This is the case with most perfume dispensers, but not optimally. With the classic distributors with swirl chamber and distribution orifice of 200 to 300 µm in diameter, the results are obtained average, but acceptable, because they generate sprays with an inhomogeneous droplet size distribution centered on about 55 µm, with 90% of droplets between 30 and 80 µm, and droplets up to 300 µm at the start and/or end of spraying. With a distributor equipped with a pusher according to the document FR2903328A1 , a clearly insufficient result is obtained, due to the fact that the size of the droplets is homogeneous: the tactile perception is then optimal, whereas the olfactory perception is non-existent, or vice versa.

In the field of the administration of fluid products by oral route, it may prove to be advantageous to have a spray making it possible to fulfill several very distinct precise functions. For example, a fluid product can be adapted to treat several distinct targets (oral cavity & pharynx, or, pharynx and larynx, or, larynx and trachea, or, trachea and lungs, or even different segments of the lungs, etc.). To reach their targets, the droplets must penetrate more or less deeply into the patient's respiratory circuit. With conventional dispensers, the results are average, but acceptable, due to the fact that they generate sprays with an inhomogeneous droplet size distribution, ranging from 30 to 80 µm. With a distributor equipped with a pusher according to the document FR2903328A1 , a clearly insufficient result is obtained, due to the fact that the size of the droplets is homogeneous: a target is then reached in an optimal manner, while the other (or the other) target remains inaccessible, or vice versa.

In a distant technical field, there are devices that include a dispensing wall with holes of different sizes, such as the document dispenser WO2016/036228A1 , which includes a wall with differently sized holes through which a gel is extruded to impregnate a puff that serves as an actuator. There are also shower heads with much larger holes that do not generate spray.

The problem of the invention, namely to fulfill several very distinct precise functions with a single and same spray, is encountered in perfumery and in inhalation as described above, but also in other fields, where a multifunction spray is advantageous.

To achieve this object, the present invention proposes a pump dispenser according to claim 1 and a valve dispenser according to claim 2. The pump dispenser generates a pressure of the order of 2 to 7 bars on the fluid product, whereas the valve distributor is in the form of a propellant gas aerosol, which generates a pressure of the order of 6 to 13 bars on the fluid product.

Instead of having a wide and inhomogeneous droplet size distribution, as with conventional dispensers, or a narrow and homogeneous droplet size distribution, as with the document dispenser FR2903328A1 , a complex droplet size distribution with two (or more) Gaussians is obtained with the nozzle of the invention, which are relatively narrow, homogeneous and above all separated and quite distinct, making it possible to reach different targets to perform different functions .

Advantageously, a series of larger holes is arranged around a series of smaller holes. With this configuration, the finest droplets are surrounded, guided and/or channeled by the largest droplets. For perfume, the humectant (wet) aspect is preponderant over the olfactory aspect. Conversely, a series of smaller holes can be arranged around a series of larger holes. In this case, the olfactory aspect predominates over the humectant (wet) aspect.

According to an advantageous arrangement, the series of holes are arranged in concentric rings. Alternatively, the series of holes may have an overall polygonal arrangement.

According to another advantageous arrangement, the spray wall defines an upper zone and a lower zone, the series of holes of smaller size extends mainly in the upper zone, while the series of holes of larger size mainly extends in the lower area. This particular arrangement is advantageous with a perfume dispenser, because the finest droplets are located above the largest droplets, so that the finest droplets, and therefore the most volatile, can easily and quickly disperse in the air, while the largest droplets, and therefore the most wetting, will directly reach the skin without being disturbed by the finest droplets.

As a variant, the series of holes can be nested in a substantially homogeneous manner. With this configuration, the droplets of different sizes are intimately mixed, potentially reducing their own characteristics, but producing a visually more homogeneous spray.

Very generally, the size of the holes of the series of holes can be of the order of 1 to 100 μm, advantageously of the order of 5 to 30 μm, and preferably of the order of 10 to 20 μm. Each series of holes comprises at least 5 holes (O) of substantially identical size. On the other hand, the hole sizes of different series differ by at least 30%.

For the spraying of a fluid product containing a fragrance, the hole size of the series of smaller holes can be of the order of 5 to 15 μm and the hole size of the series of larger holes is the order of 15 to 30 µm. Indeed, it has been observed, following various studies carried out with fragrance professionals and with users, that the particle size (size) of the perfume droplets generated during atomization had a great impact on the effectiveness of the perfuming and also on the quality perceived by the user. A low particle size (between 10 µm and 30 µm) allows rapid evaporation of the solvent phase and, therefore, reveals the top notes of the perfume very well, which is very positive for the user. Conversely, this small particle size does not allow the fragrance to be truly conveyed to the user. This was observed in the studies carried out on the piezo spray in the late 2000s. The rapid evaporation of the fragrance after its atomization produces a 'dry' spray which perfumes the environment more than the person using it. . A larger particle size, such as that generated by current pumps equipped with a swirl nozzle (Gaussian centered on +/- 55 µm), produces a more wetting spray which conveys the fragrance and its heart notes well, but reveals less the top notes.

With the dispensing head of the invention, a spray is produced whose particle size distribution would not be a wide Gaussian, but the superposition of two rather narrow Gaussians (or more), centered on distinct values (30 μm and 50 μm by example).

In addition, he also demonstrated, with technical studies of piezo-type spray characterization, that particles that are too fine tend, due to their low inertia, to swirl rapidly and therefore the contour of the spray cone is revealed disturbed and very subject to the disturbances of the surrounding air. This is why it is sometimes advantageous to generate on the periphery of the spray cone the particles that are the largest in diameter and those that are the finest in diameter at the heart of the cone. This makes it possible to reduce these effects of turbulence and to obtain a more controlled spray. By way of example only, a possible configuration could be 40 holes of 10 µm in the central part and 10 holes of 15 µm on the outer rim.

• un puits d'entrée destiné à être raccordé à une sortie d'un organe de distribution, tel qu'une pompe ou une valve,
• un logement de montage axial,
• un conduit d'alimentation reliant le puits d'entrée au logement de montage axial,
• un gicleur comprenant une paroi de montage engagée dans le logement de montage axial, la paroi de pulvérisation étant solidaire du gicleur.

According to a practical embodiment which is conventional in the fields of perfumery, cosmetics and sometimes pharmacy, the dispensing head comprises:

• an inlet well intended to be connected to an outlet of a dispensing device, such as a pump or a valve,
• an axial mounting housing,
• a supply conduit connecting the inlet well to the axial mounting housing,
• a nozzle comprising a mounting wall engaged in the axial mounting housing, the spray wall being integral with the nozzle.

Advantageously, the mounting wall is molded onto the spray wall.

The spirit of the invention lies in the fact of producing, in a single distribution or spray wall, groups of holes of different sizes to generate distinct sprays which are however superimposed, adjacent, surrounded, nested or even intermingled, during distribution.

The invention will now be more fully described with reference to the attached drawings, giving, by way of non-limiting examples, several embodiments of the invention.

• La figure 1 est une vue en coupe transversale verticale à travers une pompe équipée d'une tété de distribution selon l'invention,
• La figure 2 est une vue en perspective de la tête de distribution de la figure 1,
• La figure 3 est une vue en coupe transversale à travers la tête de distribution des figures 1 et 2,
• La figure 4 est une vue agrandie en perspective du gicleur des figures 1 à 3,
• La figure 5 est une vue coupe transversale agrandie à travers le gicleur de la figure 4, et
• Les figures 6 à 13 sont des vues de face fortement agrandies de la paroi de pulvérisation du gicleur des figures 4 et 5 selon huit modes de réalisation de l'invention.

In the figures:

• The figure 1 is a vertical cross-sectional view through a pump fitted with a dispensing head according to the invention,
• The figure 2 is a perspective view of the dispensing head of the figure 1 ,
• The picture 3 is a cross-sectional view through the dispensing head of the figure 1 and 2 ,
• The figure 4 is an enlarged perspective view of the nozzle of the figures 1 to 3 ,
• The figure 5 is an enlarged cross-sectional view through the nozzle of the figure 4 , and
• The figures 6 to 13 are greatly enlarged front views of the nozzle spray wall of the figures 4 and 5 according to eight embodiments of the invention.

On the figure 1 , the dispensing head T is mounted on a dispensing member P, such as a pump or a valve, which has a completely conventional design in the fields of perfumery or pharmacy. This dispenser member P is actuated by the user by pressing axially with a finger, generally the index finger, on the head T.

In the case of a pump, the normal pressure generated by this axial pressure on the fluid product inside the pump P and the head T is of the order of 5 to 6 bars, and preferably 5.5 at 6 bar. Peaks at 7 to 8 bars are however possible, but we are then in abnormal conditions of use. Conversely, when approaching 2.5 bars, the spray deteriorates, between 2.5 and 2.2 bars, the spray is strongly altered, and below 2 bars, there is no more spray.

In the case of an aerosol equipped with a valve, the initial pressure generated by the propellant gas is of the order of 12 to 13 bars and then drops, as the aerosol empties, until about 6 bar. An initial pressure of 10 bars is common in the field of perfumery and cosmetics.

When the assembly comprising the head (T) and a pump or valve is mounted on a reservoir of fluid product, this constitutes a fluid product dispenser, which is entirely manual, without the supply of energy, in particular electricity.

In comparison, in the technical field of sprayers with ultrasonic vibration (in particular piezoelectric), the pressure of the fluid product at the level of the nozzle is of the order of 1 bar, that is to say the atmospheric pressure, or even slightly less . Due to the pressure value implemented and the energy used, these ultrasonic vibration sprayers fall outside the scope of the invention.

We will refer interchangeably to figures 1 to 6 to describe in detail the constituent parts, as well as their mutual arrangement, of a dispensing head T, which is part of a fluid dispenser, made according to the invention.

The dispensing head T comprises two essential constituent parts, namely a head body 1 and a nozzle 2. These two parts can be produced by injection molding of plastic material. The head body 1 is preferably made in one piece: it can however be made from several parts assembled together. It is the same for the nozzle 2 which can be produced in a monobloc mono-material manner, or else by overmolding or bi-injection, possibly with a subsequent recovery operation.

The head body 1 comprises a substantially cylindrical peripheral skirt 10 which is closed off at its upper end by a plate 14. The head body 1 also comprises a connection sleeve 15 which here extends concentrically inside the peripheral skirt 10. The connecting sleeve 15 extends downwards from the plate 14. It defines internally an inlet well 11 which is open downwards and closed off at its upper end by the plate 12. The connection 15 is intended to be mounted on the free end of an actuating rod P5 of the dispensing member P. This actuating rod P5 is movable back and forth along the axis Y. The rod actuation P5 is hollow so as to define a discharge duct in communication with a chamber of P0 dosing of the P pump or the valve. The inlet well 11 extends in the extension of the actuating rod P5 so that the fluid product coming from the metering chamber P0 can flow into the inlet well 11. The head body 1 defines also a supply conduit 13 which connects the inlet well 11 to a mounting housing 12, as can be seen in the figure 1 and 3 . Axial mounting housing 12 is generally cylindrical in configuration, thereby defining an inner wall which is substantially cylindrical. The supply duct 13 opens into the mounting housing 2 in a centered manner. It can also be noted that the internal wall of the mounting housing 12 has hooking profiles allowing better maintenance of the nozzle 2, as will be seen below.

Optionally, the head body 1 can be engaged in a covering cap 3 comprising an upper support surface 31 for a finger and a lateral casing 32 forming a lateral opening 33 for the passage of the nozzle 2.

The nozzle 2 has a substantially conventional overall configuration in the form of a cup which is open at one end and closed at its opposite end by a spray wall 26 at the level of which several holes or spray orifices O are formed. , the nozzle 2 comprises a nozzle body 20 of substantially cylindrical overall shape which preferably has an axial symmetry of revolution around the axis X, as shown in the figure 1 . In other words, the nozzle 2 does not need to be oriented angularly before its presentation in front of the inlet of the axial mounting housing 12. The nozzle body 20 forms an external mounting wall 21 which is advantageously provided with hooking reliefs capable of cooperating with the hooking profiles of the mounting housing 12. Thus, the nozzle 2 can be engaged axially without any particular orientation in the axial mounting housing 12, as shown in the figure 1 . Once the axial assembly is complete, the nozzle 2 is in the configuration shown on the figure 1 and 3 .

The nozzle body 20 internally forms a chamber 22 delimited by an internal wall 23 of substantially cylindrical overall configuration, although it forms a frustoconical section 23a and two small cylindrical sections 2b and 23c. On its outer front face, the nozzle body 20 forms a flat annular area 25 in which is formed a guide cone 25.

The spray wall 26 is integral with the nozzle body 20, advantageously at the level where the small cylindrical section 23c meets the guide cone 25. The spray wall 26 is fixed to the nozzle body 20 by any means, such as overmoulding, bi-injection, one-piece mono-material molding, snap-fastening, crimping, expanding, etc.

The spray wall 26 can be a one-piece single-material part, an assembly of several parts or even a multilayer product, for example laminated. It can be made of metal, plastic, ceramic, glass or a combination thereof. More generally, any material capable of being pierced with small holes or orifices can be used. The thickness of the spray wall 26, at the level where the holes O are formed, is of the order of 10 to 100 μm. The number of holes O is of the order of 30 to 500. The thickness can be constant, or on the contrary variable. The diameter of the spray wall 26, at the level where the holes O are formed, is of the order of 0.5 to 5 mm. The spray wall 26 can be entirely flat on one or both of its faces, or on the contrary curved, preferably towards the outside. It can also be partially flat and partially curved, for example in the center. The bending of the wall 26 can be carried out after the drilling of the holes O, or on the contrary before their drilling. The holes O can have an identical orientation, for example parallel to the axis X, or on the contrary have divergent orientations, in particular when the wall 26 is curved. The density of the holes O on the wall 26 can be homogeneous, or on the contrary inhomogeneous, for example increasing or decreasing starting from the center of the wall.

According to an advantageous manufacturing process, the holes O are drilled in the spray wall 26 when it is already integral with the nozzle body 20. Thus, the nozzle body 20 can be used as a manipulation member of the spray wall. spraying 26 for its drilling operation, which can for example be carried out by laser. It should be borne in mind that the spray wall 26 is a very small piece, and therefore difficult to handle. It should be noted that the drilling of the holes O with the spray wall 26 premounted on the nozzle body 20 is a process which can be implemented whatever the size of the holes O, that is to say independently of the causes the holes to be of different sizes.

Indeed, according to the invention, the holes or spray orifices O form a network of holes comprising two series 27, 28 of holes O of different sizes with the holes O of the same series 27 or 28 having an identical hole size. or unique, taking into account manufacturing tolerances, which do not exceed 10%. Thus, for a spray wall 26 pierced with 100 holes O, it is possible to have a first series 28 of 50 holes O having a diameter of 10 μm and a second series 27 of 50 holes O having a diameter of 20 μm. The first series 28 of 50 holes O will generate a spray of fine droplets whose particle size curve has a peak formed by a relatively narrow Gaussian, then the second series 27 of 50 holes O will generate a spray of larger droplets whose particle size curve also has a peak formed by a relatively narrow Gaussian, which is however shifted and distinct from the first Gaussian of the 28 series. A spray is thus obtained with two major droplet sizes corresponding to the two Gaussians of the granulometric curves.

The distribution between series 27 and 28 can vary from 10 to 90%, and vice versa, with a minimum of five O holes per series. The hole size of the 27 series can vary from 15 to 50 µm, while the hole size of the 28 series can vary from 5 to 20 µm, with always the size of the 27 series significantly larger, at least by order of 30%, to that of the 28 series.

On the figure 6 , we see the visible part of the spray wall 26 of the dispensing head T of the figures 1 to 5 . It can be noted that it comprises a first series 27 of ten holes O having a size or a diameter clearly greater than the forty holes O of a second series 28. The first series 27 forms a ring which surrounds two other rings forming the series 28 The overall configuration is concentric. This spray wall 26 can be used to spray perfume on the body of a user. The diameter of the holes of the first series 27 can be of the order of 15 to 30 μm and the diameter of the holes of the second series 28 can be of the order of 5 to 15 μm. We thus manage to optimize the wet perception of the perfume when it is deposited on the skin thanks to the spray from the first series 27 and the olfactory perception of the perfume thanks to the spray from the first series 28. On the other hand, by having the 27 series around the 28 series, the finest droplets from the 28 series are surrounded, channeled and guided by the larger droplets from the 27 series. This prevents the finest droplets from dispersing too much by creating turbulence.

On the figure 7 , we see a spray wall 26a which has an inverse arrangement, with the series 27a of larger diameter surrounded by two rings of small holes forming a series 28a of smaller diameter. A spray is then obtained with a dense central core surrounded by a vaporous cloud. With perfume, we favor the olfactory aspect, while guaranteeing the wetting tactile aspect.

On the figure 8 , we see a spray wall 26b defining two distinct zones, namely an upper zone Zs and a lower zone Zi separated by a horizontal median. The holes O of the series 27b of larger diameter occupy the lower zone Zi, while the holes O of the series 28b of smaller diameter occupy the upper zone Zs. The two series 27b and 28b present a semi-circular configuration by forming together a complete disc. With this arrangement, the wispy cloud from the O holes of the 28b series quickly disperses in the air and will be immediately perceived by the user's sense of smell, because in general, the target to be perfumed is located below the nose.

On the figure 9 , we see a spray wall 26c with a series 27c of larger diameter occupying the lower zone Zi and arranged in a disc and the series 28c of smaller diameter occupying the upper zone Zs and arranged in an elongated rectangle. The resulting spray will be even more complex than the previous one.

On the figure 10 , we see a spray wall 26d with a series 27d of larger diameter occupying the lower zone Zi and a part of the upper zone ZS and arranged in a crescent moon, and the series 28d of smaller diameter occupying the upper zone Zs and arranged in disc inside the crescent moon of the 27d series. For perfume, the wetting aspect is preponderant with a channeled olfactory aspect, but nevertheless directed upwards.

On the figure 11 , we see a 26th spray wall with a 27th series of larger diameter arranged in a triangle surrounded by a 28th series of smaller diameter also arranged in a triangle around the 27th series. It can be noted that the triangle points downwards, so that the majority of the small holes O of the 28e series are arranged in the upper zone of the wall.

On the figure 12 , we see a spray wall 26f with a series 27f of larger diameter arranged in a square surrounding by a series 28f of smaller diameter also arranged in a square inside the series 27f. A spray substantially comparable in performance to that of the spray wall 26 of the figure 6 .

On the figure 13 , a 26g spray wall is seen with a larger diameter 27g series dispersed within a smaller diameter 28g series. The holes O of different sizes are mixed and distributed in a substantially homogeneous manner.

Without departing from the scope of the invention, it is possible to produce spray walls comprising more than two series of holes. Starting from the face 7 , one can very well imagine that the intermediate ring has a size of holes different from those of the outer and inner rings.

The number of series of holes, the number of holes per series, the layout of the holes on the spray wall, and the size or diameter of the holes are all parameters that make it possible to determine the number of Gaussians, the peak value of each Gaussian and the structure of the spray. These parameters must be set according to the fluid product to be sprayed and the multiple functions sought: tactile and olfactory for fluid products containing fragrances - penetration at different depths in the respiratory system for a fluid product to be inhaled - precise density gradient and controlled on an application surface.

Claims (14)

1. A fluid dispenser comprising a pump (P) and a fluid dispenser head (T) including a spray wall (26) that is perforated with a network of holes (O) through which the fluid under pressure passes so as to be sprayed in small droplets, the pump (P) generating pressure on the fluid lying in the range about 2 bars to 7 bars,
   the fluid dispenser being characterized in that the network of holes (O) comprises at least two series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) of holes (O), with the holes (O) of a given series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) presenting holes that are substantially identical in size, and with the holes (O) of different series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) presenting holes that are different in size, such that one series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g) of holes (O) generates a spray of small droplets with droplet sizes that define a first Gaussian distribution, while another series (28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) of holes (O) generates a spray of small droplets with droplet sizes that define a second Gaussian distribution that is offset relative to the first Gaussian distribution, thus producing a complex spray having at least two distinct Gaussian distributions.
2. A fluid dispenser comprising a propellant aerosol with a valve and a fluid dispenser head (T) including a spray wall (26) that is perforated with a network of holes (O) through which the fluid under pressure passes so as to be sprayed in small droplets, the aerosol propellant generating pressure on the fluid lying in the range about 6 bars to 13 bars,
   the fluid dispenser being characterized in that the network of holes (O) comprises at least two series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) of holes (O), with the holes (O) of a given series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) presenting holes that are substantially identical in size, and with the holes (O) of different series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) presenting holes that are different in size, such that one series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g) of holes (O) generates a spray of small droplets with droplet sizes that define a first Gaussian distribution, while another series (28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) of holes (O) generates a spray of small droplets with droplet sizes that define a second Gaussian distribution that is offset relative to the first Gaussian distribution, thus producing a complex spray having at least two distinct Gaussian distributions
3. A dispenser according to claim 1 or 2, wherein a series (27; 27d; 27f) of holes (O) of larger size is arranged around a series (28; 28d; 28f) of holes (O) of smaller size.
4. A dispenser according to claim 1 or 2, wherein a series (28a; 28e) of holes (O) of smaller size is arranged around a series (27a; 27e) of holes (O) of larger size.
5. A dispenser according to any preceding claim, wherein the series (27; 27a; 27e; 27f, 28; 28a; 28e; 28f) of holes (O) are arranged in concentric rings.
6. A dispenser according to any preceding claim, wherein the series (27c; 27e; 27f, 28c; 28e; 28f) of holes (O) present an arrangement.
7. A dispenser according to claim 1 or 2, wherein the spray wall (26) defines an upper zone (Zs) and a lower zone (Zi), the series (28b; 28c; 28d; 28e) of smaller-size holes (O) extends mainly in the upper zone (Zs), while the series (27b; 27c; 27d; 27e) of larger-size holes (O) extends mainly in the lower zone (Zi).
8. A dispenser according to claim 1 or 2, wherein the series (27g, 28g) of holes (O) are interleaved in substantially uniform manner.
9. A dispenser according to any preceding claim, wherein each series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) of holes (O) comprises at least five holes (O) that are substantially identical in size.
10. A dispenser according to any preceding claim, wherein the sizes of the holes (O) of different series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) differ by at least 30%.
11. A dispenser according to any preceding claim, wherein the size of the holes (O) of the series (27; 27a; 27b; 27c; 27d; 27e; 27f; 27g, 28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) of holes (O) lies in the range about 1 µm to 100 µm, advantageously in the range about 5 µm to 30 µm, and preferably in the range about 10 µm to 20 µm.
12. A dispenser according to claim 11, wherein the size of the holes (O) of the series (28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) of smaller-size holes (O) lies in the range about 5 µm to 15 µm, and the size of the holes (O) of the series (28; 28a; 28b; 28c; 28d; 28e; 28f; 28g) of larger-size holes (O) lies in the range about 15 µm to 30 µm, in particular for spraying fluid that contains a fragrance.
13. A dispenser according to any preceding claim, wherein the dispenser head comprises:

    • an inlet well (11) for connecting to an outlet of a dispenser member, such as a pump or a valve,

    • an axial assembly housing (12),

    • a feed duct (13) that connects the inlet well (11) to the axial assembly housing (12), and

    • a nozzle (2) including an assembly wall (21) that is engaged in the axial assembly housing (12), the spray wall (26) being secured to the nozzle (2).
14. A dispenser according to claim 12, wherein the assembly wall (21) is overmolded on the spray wall (26).

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