Spray device and use of that device

Abstract

SPRAYING DEVICE AND USE OF THIS DEVICE The present invention relates to a manual spraying device comprising: -a button (9) manually operable, said button comprising a spray nozzle (16), said spray nozzle comprising an inner chamber (20) adapted to receive a non-gaseous fluid product under pressure and bounded outwardly by a perforated front wall (17), -a reservoir (3) of fluid product to be sprayed, - and a dispensing device (4) mechanically operable by the button and adapted to transfer fluid product from the reservoir (3) to the inner chamber (20) of the nozzle, the front wall (17) comprising a plurality of calibrated holes (22) each having a diameter between 1 and 100 µm, the diameter of each hole not differing from an average of the diameters of the different holes of more than 20%.

Description

Descriptive Report of the Invention Patent for "SPRAYING DEVICE AND USE OF THIS DEVICE". The present invention relates to a spraying device and to an use of that device. More specifically, the invention relates to a manual spraying device comprising: - a manually operable button, said button comprising a spray nozzle, said spray nozzle comprising an internal chamber adapted to receive a non-gaseous fluid product under pressure and delimited outwards by a perforated front wall, - a reservoir of fluid product to be sprayed, - and a mechanically operated dispensing device activated by a button and adapted to transfer fluid product from the reservoir to the internal chamber of the nozzle. US patent document A-6,145,712 describes an example of such a spraying device, in which the front face of the spray nozzle comprises a single central hole. In this type of spraying device, the spray nozzles, which are classically mounted on pumps or spray valves, have the disadvantage of causing a large dispersion in the diameter of the sprayed fluid droplets. In fact, in spray nozzles of this type, the fractionation of the fluid product into fine droplets is achieved by a dynamic phenomenon that is particularly difficult to control, which generally consists of creating a vortex inside the nozzle's inner chamber and fractionating the fluid product into fine droplets as it exits at very high speed through the central orifice. As an example, it was possible to measure that, for a spray nozzle of the type mentioned above, in which the inner chamber receives an alcoholic solution under a pressure of 500 kPa (5 bars) from a hand pump or valve, and for a central hole in the nozzle that has With a diameter of 0.3 mm, the sprayed product consists of droplets with diameters ranging from 5 µm to 300 µm. This dispersion can prove undesirable when it is desired to spray droplets of relatively homogeneous sizes. For example, it may be desirable to spray small droplets for the inhalation of bronchial drug treatments, or it may be desirable to spray larger droplets for cosmetic or perfumery applications, so that the droplets penetrate the user's bronchi as little as possible. Furthermore, droplets of very different sizes follow very different trajectories, which is detrimental to the controlled application of the sprayed product. For example, when spraying perfume towards a user's skin, very large droplets may fall onto the user's clothing instead of being projected onto the skin, posing a risk of causing indelible stains. The present invention notably aims to correct these drawbacks. For this purpose, the invention proposes a spraying device of the aforementioned type in which the front wall comprises a plurality of calibrated holes, each having a diameter between 1 and 100 µm, the diameter of each hole not differing by more than 20% from an average of the diameters of the different holes. It should be noted that the term "diameter" does not necessarily imply that this section is circular. Thus, the holes on the front face could, if necessary, have a polygonal section, for example square, without departing from the scope of the present invention. In this case, the aforementioned diameter would be the equivalent diameter of the hole, that is, the diameter of a circular hole that has a cross-section of the same surface area as the polygonal hole. If the holes do not have a constant cross-section along their length, the diameter in question is the diameter of the minimum cross-section of the holes. Thanks to the provisions described above, the size of the droplets sprayed by the spraying device is controlled, and it is ensured. good homogeneity of this droplet size. On the other hand, the aforementioned arrangements also allow for at least partial elimination of the pressure differences with which the fluid product is fed into the inner chamber of the spray nozzle, since experience shows that the droplet size obtained thanks to the present invention is not very dependent on this pressure (the pressure differences in question may arise, for example, from differences in the actuating force of a user if the fluid product is fed by a manual pump, or, when the fluid product is fed by a valve from a pressurized product reservoir, the pressure differences in question may arise from the fact that the reservoir has already been partially emptied by previous uses of the spraying device). On the other hand, the invention aims to improve control over the shape of the aerosol obtained at the nozzle outlet while also allowing for simplified calibrated hole drilling. For this purpose, in a complementary or independent embodiment of the embodiment defined previously, the front wall is elastically deformable between a state of rest, in which said front wall is flat, and a state of actuation when fluid product under pressure is transferred to the inner chamber, in which said front wall has a convexity facing outwards. Thus, in the resting state, the holes can be easily made in the flat front wall, each hole having an axis that extends in a plane parallel to a central axis perpendicular to the front wall. In the operating state, when fluid product is sprayed, the axes of the holes move away from the central axis so as to present an outward divergence, and the fluid product can be sprayed in the form of an aerosol with a high opening angle. In various embodiments of the spraying device according to the invention, it is eventually possible to resort to another option. to one and / or the other of the following provisions: - the front wall in the operating state has a spherical cap shape, - the front wall is attached to a peripheral side wall that extends longitudinally along a central axis roughly perpendicular to said front wall, - the front wall is formed as a single piece with the side wall, - The side wall is formed from a single piece with the button, and the front wall has a thickness between 0.10 and 0.20 mm. - The side wall is a separate piece from the button, joined to said button, and the front wall has a thickness between 0.05 and 0.10 mm. The front wall is a separate piece from the side wall, but is joined to said side wall. - the front wall is made of a material chosen from silicon, glass, metals and their alloys, ceramics, polymers, The side wall is made of plastic material and is overmolded around the front wall. - the front wall is constructed as a complex comprising at least one polymer layer, - the complex comprises a polyester layer, - the complex also includes a heat-sealable material covering, with the front wall being glued onto the side wall, - the complex also comprises at least one layer of polymer chosen from either polyethylene or polypropylene, the front wall being welded onto the side wall, - the complex also comprises at least one layer of metallic material, - the complex has a thickness between 0.025 and 0.120 mm, - the diameter of each hole in the front wall does not differ from the said average by more than 10%. On the other hand, the invention aims to improve the control of droplet distribution and aerosol shape. To do this, independently or complementarily to the embodiment defined previously, the holes in the front wall are distributed around a center, each hole extending along an axis inclined relative to the normal to said front wall at the level of said hole, said axis and said normal defining a plane approximately tangent to a circle centered at said central point and passing through the hole, and the axes of all holes having an inclination relative to the corresponding normal, and said axes of all holes being inclined in the direction of the same angular direction around said central point so as to generate a swirling aerosol when fluid product is sprayed by said nozzle. Due to the turbulent trajectory of the droplets, the aerosol may present, in the vicinity of the spray nozzle, a first, roughly conical part with a high opening angle and a second part that is roughly symmetrical in relation to the central axis of the nozzle. In various embodiments of the spraying device according to the invention, it is possible to resort to one or the other of the following arrangements: - all the holes have the same angle, - all holes have an inclination between 10 and 60 degrees, - each hole has a segment with a roughly constant cross-section and a length between 0.08 and 0.3 mm, - the front wall of the nozzle comprises from 10 to 1000 holes, - the average diameter of the holes is between 1 and 3 µm (this range of values ​​is specifically suited for spraying pharmaceutical products for lung treatment). - the average diameter of the holes is between 3 and 10 µm (this range of values ​​is especially suited for spraying). (of pharmaceutical products for the treatment of the trachea and bronchi), - the average diameter of the holes is between 10 and 60 pm (this range of values ​​is specifically adapted for spraying pharmaceutical products for treating the nose, mouth, and throat). - the average diameter of the holes is between 50 and 100 µm (this range of values ​​is especially suited for spraying pharmaceutical skin treatment products or for spraying makeup products). - the average diameter of the holes is between 15 and 60 µm (this range of values ​​is especially suited for spraying perfume products). - the average diameter of the holes is between 20 and 70 µm (this range of values ​​is especially suited for spraying cosmetic skin care products). The dispensing device is chosen between a hand pump and a valve. - the reservoir is filled with a fluid product to be sprayed that has a dynamic viscosity of less than 50 cps, - The dispensing device is adapted to supply the nozzle's internal chamber with fluid product to be sprayed under a pressure of less than 700 kPa (7 bars). On the other hand, the invention also relates to the use of a spraying device as defined above, for spraying a non-gaseous fluid product. In various ways of implementing this use, it is possible to resort to one or the other of the following provisions: - The fluid product has a dynamic viscosity of less than 50 cps at 20°C. - The spraying device is used to spray at least one pharmaceutical product for lung treatment, with the average diameter of the nozzle holes being between 1 and 3 µm. - The spraying device is used to spray at least one pharmaceutical product for the treatment of the trachea and / or bronchi, with the average diameter of the nozzle holes being between 3 and 10 µm. - The spraying device is used to spray at least one pharmaceutical product for treatment of the nose, mouth or throat, the average diameter of the nozzle holes being between 10 and 60 µm. - The spraying device is used to spray at least one pharmaceutical skin treatment product, with the average diameter of the nozzle holes being between 50 and 100 µm. - The spraying device is used to spray at least one perfumery product, the average diameter of the nozzle holes being between 15 and 60 mm. - The spraying device is used to spray at least one cosmetic skin care product, with the average diameter of the nozzle holes being between 20 and 70 µm. - The spray device is used to spray at least one makeup product, with the average diameter of the nozzle holes being between 50 and 100 µm. - The internal chamber of the nozzle is fed with the product to be sprayed, under a pressure of less than 700 kPa (7 bars). Other features and advantages of the invention will appear in the following description of three of its embodiments, given by way of non-limiting examples, with reference to the accompanying drawings. In the drawings: Figure 1 is a vertical cross-sectional view of a fluid product spraying device according to one embodiment of the invention. Figure 2 is a vertical cross-sectional view of the spraying device button of Figure 1, in a first embodiment of the invention. Figure 3 is a detailed view of the vertical cross-sectional views of the spray device button of Figure 2; Figures 4 and 5 are vertical cross-sectional views of the spray device button of Figure 1 in a second embodiment of the invention, the figures representing the spray nozzle respectively in a resting state and in an actuated state. Figures 6 and 7 are views similar to Figures 4 and 5 respectively, in a variant of the second embodiment of the invention. Figures 8 and 9 are viewed similarly to Figures 2 and 3, respectively, in a third embodiment of the invention. Figure 10 is a view similar to Figure 9, in a variant of the third embodiment of the invention. Figure 11 is a face view of the front wall of the spray nozzle of the device, in a fourth embodiment, the holes in this front wall being represented wider than in reality, for greater clarity. Figure 12 is a cross-sectional view developed according to the curved line XII-XII of Figure 11. Figure 13 is a view similar to Figure 1, which illustrates the operation of the fourth embodiment of the invention. In the different figures, the same reference designates identical or similar elements. Figure 1 represents a spraying device 1 adapted for spraying a non-gaseous fluid product 2 contained in a reservoir 3. The fluid product in question may be a liquid or semi-liquid product, for example a pharmaceutical product, a cosmetic product, a perfumery product or other. The dynamic viscosity of the fluid product 2 is generally less than 50 cps (centipoises) at 20°C. The spraying device 1 further comprises a distribution device 4 which is conveniently attached to a neck 5 of the reservoir 3 at the upper end of said reservoir. Distribution device 4 could, for example, be a pump. manual spraying or a spray valve, in which case reservoir 3 is under pressure. In all cases, the dispensing device 4 comprises a downward-oriented fluid product inlet 6, which communicates with the bottom of the reservoir 3 by means of a plunger tube 7, and a hollow actuating rod 8 that protrudes upwards. A push button 9 is fitted to the upper end of the actuating rod 8, and serves both to actuate the dispensing device 4 and to release the sprayed fluid product, which is effected through the actuating rod 8, in accordance with the arrow 10 shown in figure 2. It will be noted that the distribution device shown in Figure 1 could, as a variant, be used in the inverted position, that is, with the bottom of the reservoir 3 facing upwards. In this case, the distribution device 4 would not include a plunger tube 7. As shown in Figure 2, button 9 can, for example, be molded from a single piece of plastic material, notably polyolefin, such as polypropylene or another material. Button 9 comprises a roughly horizontal upper wall 11 and a roughly cylindrical and vertical skirt 12, which extends from the periphery of the upper wall 11. On the other hand, button 9 further comprises a central well 13 that extends vertically downwards from the upper wall 11, in the center of the side wall 12. The upper end of the actuating rod 8 is fitted into the central well 13. At the upper end of the central well 13 there is a side passage 14 that communicates with a roughly cylindrical nozzle receiving housing 15, which extends roughly horizontally along a central axis X and opens to the outside of the button 9. As shown in Figures 2 and 3, a spray nozzle 16 is forcibly fitted into the nozzle housing 15. This spray nozzle 16 can be formed from a single piece made of plastic material, for example polybutylene terephthalate (PBT), cycloolefin copolymer (COC) or polyacetal (POM) and comprises: - a perforated front wall 17, - and an annular side wall 18 having a cylindrical shape (of revolution or not) extending along the X-axis into the inner part of the nozzle housing 15, from the periphery of the front wall 17. As is known in itself, the side wall 18 of the spray nozzle 16 may comprise, at its end opposite the front wall. 17 an annular keyway 19 that is radially protruding outwards and that penetrates the button material 9 to anchor the spray nozzle 16 in the nozzle housing 15. The spray nozzle 16, using button 9, delimits an internal chamber 20 that communicates with the passage 14 mentioned above and receives the fluid product to be sprayed when the distribution device 4 is activated. Optionally, as can be seen in Figure 2, button 9 may include a core 21 that protrudes from the inside of the side wall 18 of the spray nozzle to limit the volume of this internal chamber 20. As shown in more detail in Figure 3, the front wall 17 of the spray nozzle comprises a plurality of holes 22 which are distributed across the surface of said front face. The number of holes 22 can be from 10 to 1000 for example. The diameter of each hole 22 is generally between 1 and 100 µm, all holes 22 having approximately the same diameter. More frequently, the diameter of each hole 22 does not differ from the average value of the diameters of the different holes 22 by more than 20%, and advantageously, the diameter of each hole 22 does not differ from said average value by more than 10%. Holes 22 may have a roughly cylindrical shape with a circular cross-section, but they could, if necessary, have a polygonal cross-section, for example a square, in which case the aforementioned diameter This would be the equivalent diameter of the hole, meaning the diameter of a circular hole that has the same surface area as the polygonal hole. The diameter of the holes 22 can be chosen depending on the fluid product to be sprayed, for example: - the average diameter of holes 22 may be between 1 and 3 end (micrometers) for spraying pharmaceutical products for lung treatment, - The average diameter of holes 22 may be between 3 and 10 µm for spraying pharmaceutical products for the treatment of the trachea and bronchi. - the average diameter of the holes 22 may be between 10 and 60 for the purpose of spraying pharmaceutical products for the treatment of the nose, mouth or throat, - the average diameter of the holes 22 can be between 50 and 100 mm, suitable for spraying pharmaceutical skin treatment products or for spraying makeup products. - the average diameter of holes 22 may be between 15 and 60 end for spraying perfumery products, - the average diameter of holes 22 may be between 20 and 70 end for spraying cosmetic skin care products, The front wall 17 may have a curved shape with the concavity facing inwards, as in the example shown in Figure 3, but said front wall may be flat or have any other desired shape. On the other hand, the front wall 17 may have a thickness generally between 0.08 and 1.5 mm, notably between 0.2 and 0.4 mm. Holes 22 may have a constant cross-section, as in the example shown, but holes 22 could, if necessary, have enlarged sections inwards and / or outwards, in which case the length of holes 22 to be considered would be the length at which these holes have a constant cross-section, and the diameter to be considered would be... The consideration would be the diameter of the minimum section. The length of the holes 22 in their constant section portion is generally between 0.08 and 0.5 mm, advantageously between 0.08 and 0.3 mm, and even more advantageously between 0.08 and 0.2 mm, notably equal to 0.1 mm. As shown in Figure 2, when a user presses the button 9, the latter activates the dispensing device 4, which supplies the internal chamber 20 of the nozzle with fluid product under pressure, at a pressure generally less than 700 kPa (7 bar), for example on the order of 500 kPa (5 bar). The fluid product is expelled through the calibrated holes 22 in the front wall 17, which produces an aerosol 23 of fine droplets of relatively homogeneous size and little dependent on the exact value of the fluid product pressure inside the internal chamber 20. In a second embodiment represented in figures 4 and 5, the spray nozzle 16 differs from the spray nozzle previously described in that the front wall 17b is elastically deformable between a resting state represented in figure 4 and an actuation state represented in figure 5, when fluid product under pressure is transferred to the inner chamber 20. Specifically, in the resting state, the front wall 17b extends in a plane perpendicular to the central axis X. And in the actuated state, the front wall 17b exhibits an outward convexity, for example, presenting a spherical cap shape. As shown in Figures 4 and 5, in the resting state, the front wall 17b is flat. This arrangement allows for the simple creation of holes 22, which have an axis extending, for example, along a normal to the front wall 17b, parallel to the central axis X. When a user presses button 9, pressurized fluid is transferred to the internal chamber 20, exerting a force on the front wall 17b, causing it to enter an actuated state. The axes of the holes 22 move away from the central axis X, diverging outwards. The fluid is expelled through the holes 22, diverging from the front wall 17b, producing an aerosol. 23 of fine droplets of relatively homogeneous size, the aerosol 23 being noticeably conical with a high cone angle. In Figures 4 and 5, the side wall 18 is a separate piece from button 9, joined to button 9, and the front wall 17b, molded together with the side wall 18, is made of the same material as the side wall 18. To allow the transition from the rest state to the actuation state, the front wall 17b is provided to have a thickness between 0.05 and 0.10 mm. The embodiment of the elastically deformable front wall 17b according to the second embodiment can be provided in a complementary or independent manner from the embodiment described above, in which all holes 22 have approximately the same diameter, between 1 and 100 pm, and the diameter of each hole 22 does not differ from the average value of the diameters of the different holes 22 by more than 20% and advantageously. In the variant shown in figures 6 and 7, it is possible to foresee that the side wall 18a is formed from a single piece with the button 9. The front wall 17c can thus be made from a single piece with the button 9 and be of the same material as the button 9. The core 21 can then be a piece adapted and joined to the button 9 in an appropriate manner. As shown in Figures 6 and 7, it is possible to predict that the front wall 17c is deformable. To achieve this, the front wall 17c can have a thickness between 0.10 and 0.20 mm. However, it would also be possible to predict that the front wall 17c can have only a flat shape, a curved shape, or any other desired shape. The third embodiment of Figures 8 and 9 is similar to the embodiment of Figures 2 and 3, and will therefore not be described again in detail. In this embodiment of Figures 8 and 9, the spray nozzle 16 differs from the spray nozzle previously described in that the front wall 17a is made of a different material from the side wall 18 of the nozzle, the side wall 18 being a distinct piece from the button 9, joined to the button 9. In the variant represented in Figure 10, it is possible to predict that the front wall 17a is joined to side wall 18a, which is formed as a single piece with button 9. For example, the front wall 17a can be made of a material chosen from silicon, glass, metals and their alloys, ceramics or polymers, while the side wall 18 is made of plastic material as in the preceding example, said side wall 18 being able to be overmolded around the perimeter of the front wall 17a. In the embodiment shown in Figures 8 and 9, the front wall 17a is flat, but it could be curved as in the embodiment shown in Figures 2 and 3, or have any other shape. On the other hand, in another embodiment, the front wall 17a may be deformable. For example, the front wall 17a may be implemented in the form of a complex comprising at least one polymer layer and optionally a metallic material layer. The complex may have a thickness between 0.025 and 0.120 mm. By way of example, but not limited to, the complex may include: - a layer of polyester, 0.025 mm thick, and a heat-sealable coating that allows the front wall 17a to be bonded to the side wall 18, or - a polyester layer, 0.025 mm thick, and a polyethylene layer, 0.020 mm thick, which allow the front wall 17a to be welded onto the side wall 18, or - a layer of polyester, 0.025 mm thick, and a layer of polypropylene, 0.020 mm thick, or - a polyester layer, 0.025 mm thick, an aluminum layer, 0.008 mm thick, and a polyethylene layer, 0.040 mm thick. In the fourth embodiment of the invention, represented in Figures 11 to 13, in a manner complementary to or independent of the embodiment of the elastically deformable front wall 17, each hole 22 of the front wall 17 of the spray nozzle extends along an axis X2 inclined relative to the normal X1 to said front wall at the level of said hole 22. The axis X2 and the normal X1 define a plane approximately tangent to a circle C centered at the midpoint of the front wall 17 and passing through hole 22. The axes X2 of all holes 22 have an inclination y in the same direction relative to the corresponding normal X1. This inclination can advantageously be the same for all holes, and be, for example, between 10 and 60°, notably on the order of 30°. Due to the fact that the holes 22 are all inclined in the same angular direction 24 (figure 6), when an aerosol A is generated by the spray nozzle (see figure 8), the trajectory v followed by each droplet of liquid in the aerosol is a swirling trajectory around the central axis X of the spray nozzle. Aerosol A has a first part b1, near the spray nozzle, in which the liquid droplets are propelled at a high speed and which is roughly conical with a relatively high aperture angle a, for example on the order of 20°C or more. Furthermore, aerosol A has a second part p2 that forms a cloud, in which the liquid droplets have a lower forward velocity than in the first part p1. Thanks to the turbulent movement of the liquid droplets, the second part b2 of the aerosol remains relatively symmetrical with respect to the X-axis. In this embodiment, with a front wall 17 comprising one hundred holes 22 of diameter 3 pm arranged in a wall 17 of thickness 0.3 mm, with an inclination of the holes of the order of 30° and with a pressure of an alcoholic liquid of the order of 50 KPa (0.5 bars) in the internal part of the spray nozzle, the spraying of an aerosol consisting of droplets of diameter 5 pm to 7 pm is obtained. It is possible to foresee, as a variant, that the front wall 17 is elastically deformable. In the resting state, the calibrated holes 22 can then be easily made with an X2 shaft that extends in a plane parallel to the central X-axis of the spray nozzle 16. The divergence of the X2 axis of the calibrated holes 22 can be obtained by pressing the button to increase the opening angle a of the first part of the aerosol A.

Claims

CLAIMS 1. Manual spraying device comprising: - a manually operable button (9), said button comprising a spray nozzle (16), said spray nozzle comprising an internal chamber (20) adapted to receive a non-gaseous fluid product under pressure and delimited outwards by a perforated front wall (17), - a reservoir (3) of fluid product to be sprayed, - and a dispensing device (4) mechanically actuated by a button and adapted to transfer fluid product from the reservoir (3) to the internal chamber (20) of the nozzle, characterized in that the front wall (17) comprises a plurality of calibrated holes (22) each having a diameter between 1 and 100 pm, the diameter of each hole not differing from an average of the diameters of the different holes by more than 20%.

2. Spraying device according to claim 1, wherein the front wall (17b; 17c) is elastically deformable between a resting state, in which said front wall (17b; 17c) is flat, and an actuation state when fluid product under pressure is transferred to the inner chamber (20), in which said front wall (17b; 17c) has an outward convexity.

3. Spraying device according to claim 2, in which the front wall (17b; 17c) in the drive state has a spherical cap shape.

4. Spraying device according to any one of claims 1 to 3, in which the front wall (17) is integral with a peripheral side wall (18; 18a) that extends longitudinally along a central axis (X) approximately perpendicular to said front wall (17).

5. Spraying device according to claim 4, in which the front wall (17) is formed of a single piece with the side wall (18; 18a).

6. Spraying device according to claim 5 when it depends on claim 2, in which the side wall (18a) is formed of a single piece with the button (9), and the front wall (17b; 17c) has a thickness (e) between 0.10 and 0.20 mm.

7. Spraying device according to claim 5 wherein it depends on claim 2, the side wall (18) is a piece distinct from the button, joined to said button (9), and the front wall (17b; 17c) has a thickness between 0.05 and 0.10 mm.

8. Spraying device according to claim 4, wherein the front wall (17a) is a distinct piece from the side wall (18; 18a), joined together with said side wall (18; 18a).

9. Spraying device according to claim 8, in which the front wall (17a) is made of a material chosen from silicon, glass, metals and their alloys, ceramics, polymers.

10. Spraying device according to claim 8 or claim 9, wherein the side wall (18) is made of plastic material and is overmolded around the front wall.

11. Spraying device according to claim 8, in which the front wall (17a) is made in the form of a complex comprising at least one polymer layer.

12. Spraying device according to claim 11, in which the complex comprises a polyester layer.

13. Spraying device according to claim 12, in which the complex comprises, on the other hand, a heat-sealable material covering, the front wall (17a) being glued onto the side wall (18; 18a).

14. Spraying device according to claim 12, wherein the complex comprises on the other hand at least one layer of polymer chosen from between polyethylene and polypropylene, the front wall (17a) being welded onto the side wall (18; 18a).

15. Spraying device according to any one of claims 11 to 14, wherein the complex comprises on the other hand at least one layer of metallic material.

16. Spraying device according to any one of claims 11 to 14 when it depends on claim 2, wherein the complex has a thickness between 0.025 and 0.120 mm.

17. Spraying device according to any one of claims 1 to 16, in which the diameter of each hole (22) in the front wall does not differ from said average by more than 10%.

18. Spraying device according to any one of claims 1 to 17, in which the holes (22) of the front wall (17) are distributed around a center (O), each hole (22) extending along an axis (X2) inclined relative to the normal (X1) to said front wall at the level of said hole (22), said axis (X2) and said normal (X1) defining a plane approximately tangent to a circle (C) centered at said central point (O) and passing through the hole (22), the axes (X2) of all holes having an inclination (y) relative to the corresponding normal (X1), and said axes (X2) of all holes (22) all being inclined in the direction of the same angular direction (24) around said central point (O), so as to generate a swirling aerosol (A) when fluid product is sprayed by said nozzle.

19. Spraying device according to claim 18, in which all holes (22) have the same inclination (y).

20. Spraying device according to claim 18 or 19, in which all holes (22) have an inclination (y) between 10 and 60 degrees.

21. Spraying device according to any one of claims 1 to 20, in which each hole (22) has a segment of approximately constant cross-section and a length between 0.08 and 0.3 mm.

22. Spraying device according to any one of claims 1 to 21, in which the front wall (17) of the nozzle comprises from 10 to 1000 holes.

23. Spraying device according to any one of claims 1 to 22, in which the average diameter of the holes is between 1 and 3 pm.

24. Spraying device according to any one of claims 1 to 22, in which the average diameter of the holes is between 3 and 10 µm.

25. Spraying device according to any one of claims 1 to 22, in which the average diameter of the holes is between 10 and 60 µm.

26. Spraying device according to any one of claims 1 to 22, in which the average diameter of the holes is between 50 and 100 µm.

27. Spraying device according to any one of claims 1 to 22, in which the average diameter of the holes is between 15 and 60 µm.

28. Spraying device according to any one of claims 1 to 22, in which the average diameter of the holes is between 20 and 70 µm.

29. Spraying device according to any one of claims 1 to 28, wherein the dispensing device (4) is chosen between a hand pump and a valve.

30. Spraying device according to any one of claims 1 to 29, in which the reservoir (3) is filled with fluid product to be sprayed having a dynamic viscosity of less than 50 cps.

31. Spraying device according to any one of claims 1 to 30, in which the dispensing device (4) is adapted to feed the inner chamber (20) of the nozzle with fluid product to be sprayed under pressure less than 700 kPa (7 bars).

32. Use of a spraying device as defined in any one of claims 1 to 22, to spray a non-gaseous fluid product.

33. Use according to claim 32, wherein the fluid product has a dynamic viscosity of less than 50 cps at 20°C.

34. Use in accordance with claim 32 or claim 33. tion 33, for spraying at least one pharmaceutical product for lung treatment, the average diameter of the nozzle holes (22) being between 1 and 3 pm.

35. Use according to claim 32 or claim 33, for spraying at least one pharmaceutical product for the treatment of the trachea and / or bronchi, the average diameter of the nozzle holes (22) being between 3 and 10 µm.

36. Use according to claim 32 or claim 33, for spraying at least one pharmaceutical product for treatment of the nose, mouth or throat, the average diameter of the nozzle holes (22) being between 10 and 60 µm.

37. Use according to claim 32 or claim 33, for spraying at least one pharmaceutical skin treatment product, the average diameter of the nozzle holes (22) being between 50 and 100 µm.

38. Use according to claim 32 or claim 33, for spraying at least one perfumery product, the average diameter of the nozzle holes (22) being between 15 and 60 µm.

39. Use according to claim 32 or claim 33, for spraying at least one cosmetic product for skin care, the average diameter of the holes (22) of the nozzle being between 20 and 70 µm.

40. Use according to claim 32 or claim 33, for spraying at least one makeup product, the average diameter of the nozzle holes (22) being between 50 and 100 µm.

41. Use in accordance with any of claims 32 to 40, in which the inner chamber of the nozzle is fed with product to be sprayed, under a pressure of less than 700 kPa (7 bars).