EP4323122A1

EP4323122A1 - Spray apparatus for spraying a cosmetic liquid, method for operating a spray apparatus, nozzle for a spray apparatus and nozzle array for a spray apparatus

Info

Publication number: EP4323122A1
Application number: EP22722693.3A
Authority: EP
Inventors: Sebastian Mangold; Mujo Taletovic; Thomas Jeltsch; Alfred Göhring; Manuel FIESEL
Original assignee: J Wagner GmbH
Current assignee: J Wagner GmbH
Priority date: 2021-04-16
Filing date: 2022-04-08
Publication date: 2024-02-21
Also published as: US20240207873A1; CN117500606A; DE102021109651A1; WO2022218848A1

Abstract

The invention relates to a spray apparatus (101) for spraying a cosmetic liquid (F) using electrostatic forces, comprising: a fluid supply (103), at least one feed device (104), at least one nozzle (105), wherein the nozzle (105) comprises a nozzle body (106), a connection flange (107), a nozzle channel (108), a spray opening (109) and an electrode (102), wherein the fluid supply (103) is connected to the feed device (104), wherein the feed device (104) is connected to the nozzle (105), and wherein the electrode (102) is arranged in the nozzle channel (108). Here, the electrode (102) is arranged in the nozzle channel (108) in such a way that said electrode is at a distance (D), measured along a longitudinal axis (L108) of the nozzle channel (108), of at most 2.1 mm and at least 0.0 mm, in particular at least 0.1 mm, preferably at least 0.7 mm, from the spray opening (109).

Description

"SPRAYING DEVICE FOR SPRAYING A COSMETIC LIQUID, METHOD OF OPERATING A SPRAYING DEVICE, NOZZLE FOR A SPRAYING DEVICE AND NOZZLE ARRAY FOR A SPRAYING DEVICE"

The invention relates to a spray device for spraying a cosmetic liquid, a method for operating a spray device, a nozzle for a spray device and a nozzle array for a spray device according to the preamble of claim 1, 10, 12 or 13.

DE 102019 135 150 A1 discloses an atomizer nozzle system for an electrodynamic atomizer, in which the distance between an electrical contact element and a nozzle opening is between 5 mm and 20 mm.

The object of the invention is to propose a spray device for spraying a cosmetic liquid, a method for operating a spray device, a nozzle for a spray device and a nozzle array for a spray device, in which the spraying of cosmetic liquid functions particularly reliably .

Starting from the features of the preamble of claim 1 or 10 or 12 or 13, this object is achieved by the characterizing features of claim 1 or 10 or 12 or

13 solved. Advantageous and expedient developments are specified in the respective dependent claims.

The spray device according to the invention for spraying a cosmetic liquid by electrostatic forces comprises a fluid supply, at least one feed device and at least one nozzle, the nozzle having a nozzle body, a connecting flange, a nozzle channel, a spray opening and a Electrode comprises, wherein the fluid supply is connected to the feed device, wherein the feed device is connected to the nozzle, wherein the electrode is arranged in the nozzle channel and wherein the electrode is arranged in the nozzle channel in such a way that it leads to the spray opening along a longitudinal axis of the Nozzle channel measured distance of at most 2.1 mm and at least 0.0 mm, in particular at least 0.1 mm, preferably at least 0.7 mm. It has been shown that spray devices dimensioned in this way work particularly reliably when spraying cosmetic liquids. Even an electrode lying in the same plane as the spray opening does not pose a problem in the light of the invention. A small distance, in particular up to 0.1 mm, preferably 0.7 mm, is preferred.

Provision is also made to apply an operating voltage of at most 10 kV and in particular of approximately 7 kV to 8 kV to the electrode during operation of the spray device. This also promotes reliable operation according to the tests that have been carried out.

It is also provided to equip the spray device with a safety device, by which the operating voltage is reduced to a maximum safety voltage of 120 V direct current and preferably 0 V if a safety device detects a current flow of more than 10 microamperes and preferably more than 4 microamperes. In this way, undesired operating states can be reliably avoided.

It is also contemplated that an operating current of approximately 2 microamps will flow during trouble free spray operation. This allows the spraying process to be monitored and documented using the operating current.

Provision is also made for the electrode to be in the form of a rod-shaped electrode which is arranged in the nozzle channel, or for the electrode to be in the form of a tubular electrode which is arranged in the nozzle channel, with the tubular electrode in particular having a lateral surface in contact with an inner lateral surface of the nozzle channel. It has been shown empirically that such elongated electrodes also promote reliable operation.

Provision is also made for the end of the electrode opposite the spray opening to be flattened. It has been shown empirically that electrodes shaped in this way, which end with a circular surface or an annular surface, for example, also promote reliable operation.

Provision is also made for the spray device to be operated with a power of at least 14 milliwatts and at most 100 milliwatts. As a result, power consumption can be kept within limits while maintaining reliable operation.

Provision is made for the cosmetic liquid to be in the form of an electrically insulating liquid and in particular as a liquid and electrically insulating cosmetic sun protection product. Particularly good results could be achieved in the test with such liquids.

Finally, it is provided that the nozzle of the spray device be equipped with a contact body, the contact body encasing a section of the electrode and being connected to a high-voltage supply line, the contact body is formed from an electrically conductive synthetic polymer, preferably from an electrically conductive silicone, it being provided in particular that the contact body forms a contact resistance between a contact point and the section of the electrode for providing a current flow for a switch-off sensor system, one being provided in particular that the contact body is designed as a plug, it being provided in particular that the contact body forms the connection flange and is accommodated in the nozzle body or that the contact body is accommodated in the connection flange, it being provided in particular that the high-voltage supply line is designed as a guide plate and the contact body is contacted by means of the guide plate and it is provided that the contact body is designed to taper in the manner of a cone towards the spray opening. By equipping the spray device with such a contact body, it was possible to achieve particularly good results in tests.

In addition, the contact resistance between the contact point and the section of the electrode makes it possible, for example, to obtain a current flow of 10 mA even at a high voltage of 7 kV, and thereby to activate the switch-off sensor system. The transition resistance should therefore be less than or equal to 700 mega-ohms in order to cause at least a 7kV voltage drop. With a preferred sensitivity of as little as 1% of the voltage from a voltage drop of as little as 70V, the contact resistance should even be less than or equal to 7 megaohms. The corresponding method for using this possible embodiment is described below. However, the method is not limited to the operating variables described in this section. The method according to the invention for operating a spray device, which is designed in particular according to at least one of claims 1 to 9, comprises the steps:

starting a spraying operation by activating a fluid supply and applying an operating voltage of at most 10 kV and in particular of about 7 kV to 8 kV to an electrode;

Monitoring the spray operation using a safety device, the safety device reducing the operating voltage to a safety voltage of 120 V DC and preferably 0 V if the safety device detects a current flow of more than 10 microamperes and preferably more than 4 microamperes. In this way, according to the tests carried out, reliable operation is also promoted and undesired operating states can be reliably avoided as a result.

Furthermore, the method provides for the safety device to reapply the operating voltage to the electrode within milliseconds after it has been shut down to the safety voltage. As a result, an almost uninterrupted operation can be realized for the user's perception.

The nozzle according to the invention for a spray device for spraying a cosmetic liquid, which is designed in particular as an electrically insulating liquid, by electrostatic forces comprises a nozzle body, a connecting flange, a nozzle channel, a spray opening and an electrode, the electrode being arranged in the nozzle channel and being the electrode is arranged in the nozzle channel in such a way that it is at a distance from the spray opening of at most 2.1 mm and at least 0.0 mm, in particular at least 0.1 mm, measured along a longitudinal axis of the nozzle channel at least 0.7 mm. It has been shown that the spraying of cosmetic liquids can be implemented particularly reliably with such a nozzle. Even an electrode lying in the same plane as the spray opening does not pose a problem in the light of the invention. A small distance, in particular up to 0.1 mm, preferably 0.7 mm, is preferred.

The array of nozzles according to the invention for a spray device for spraying a cosmetic liquid by electrostatic forces comprises at least three nozzles according to the invention. Empirically it has been shown that with such a nozzle array, the spraying of cosmetic liquids can be implemented particularly reliably and efficiently, particularly on larger areas of skin.

Provision is also made for the longitudinal axes of the nozzle channels to be aligned parallel to one another. Such an orientation of the nozzle channels makes handling easier for a user, since he can be guided by his feeling for the orientation of one of the nozzles.

Finally, the cosmetic liquid is in the form of an electrically insulating liquid and in particular a liquid and electrically insulating cosmetic sun protection product. Particularly good results could be achieved in the test with such liquids.

Further details of the invention are described in the drawing on the basis of exemplary embodiments shown schematically. This shows:

Figure 1: a schematic partial view of a first

Embodiment of a spray device according to the invention with a rod-shaped electrode in a sectional side view;

FIG. 2: a schematic partial view of a second embodiment variant of a spray device according to the invention with a tubular electrode in a sectional side view;

FIG. 3: a schematic partial view of a third

Embodiment of a spray device according to the invention with a contact body in a sectional side view and

Figure 4-6: Partial perspective views of a fourth

Embodiment of a spray device according to the invention with a contact body.

FIG. 1 shows a schematic partial view of a first embodiment variant of a spray device 101 according to the invention with a rod-shaped electrode 102 in a sectional side view. The spray device 101 is designed for spraying a cosmetic liquid F by electrostatic forces and comprises a fluid supply 103 shown purely schematically, a feed device 104 and a nozzle 105. The fluid supply 103 comprises a tank 103a for the cosmetic liquid F and a pump 103b to promote the cosmetic liquid F through the supply device 104 of the nozzle 105. The nozzle 105 comprises a nozzle body 106, a connecting flange 107, a nozzle channel 108, a spray opening 109 and the electrode 102. The fluid supply 103 is connected to the feed device 104 and the feed device 104 is connected to the nozzle 105. The electrode 102 is arranged in the nozzle channel 108 . Electrode 102 is arranged in nozzle channel 108 in such a way that it is at a distance D of 1.5 mm from spray opening 109, measured along a longitudinal axis L108 of nozzle channel 108, with this distance being up to 2.1 mm and can be at least 0.7 mm or less.

An operating voltage of about 7.5 kV is present at the electrode 102 when the spray device 101 is in operation. Operation with up to 10 kV and at least about 7 kV is provided for in the case of design variants.

The spray device 101 includes a safety device 110, by which the operating voltage is reduced to a safety voltage of maximum 120 V direct current when a safety device 110 detects a current flow of more than 10 microamperes. According to embodiment variants, a safety voltage of 0 V can also be provided and a current flow of more than 4 microamperes can also be provided as a limit value for reducing the operating voltage to the safety voltage. In the case of the spraying device 101, an operating current of approximately 2 microamperes flows during trouble-free spraying operation.

The rod-shaped electrode 102 is arranged centrally in the nozzle channel 108 . Here, the nozzle channel 108 runs through the connecting flange 107 and the nozzle body 106 and opens into the spray opening 109 formed in the nozzle body 106. One of the Spray opening 109 in the nozzle channel 108 opposite end 102a of the electrode 102 is flat in the form of a circular disk. According to an embodiment variant, a planar design in the form of a polygonal area is also provided.

One coming from a high voltage source 111

High-voltage feed line 112 is designed as a baffle plate 113, with which the electrode 102 is connected to a second end 102b lying opposite the first end 102a. In this case, the baffle plate 113 in the area of the nozzle channel 108 comprises an annular contact 113a with a web 113b leading to the electrode 102 .

The spray device 101 is operated with a power of at least 14 milliwatts and at most 100 milliwatts. In this case, the power is selected to match the liquid F to be sprayed and to match the application and to match the number of nozzles. The spray device 101 shown in FIG. 1 can—as shown—be equipped with a nozzle 105 and alternatively also with further nozzles, these then being constructed in a manner comparable to the nozzle shown and with several nozzles forming a nozzle array.

The cosmetic liquid F is an electrically insulating liquid EF and is designed as a liquid and electrically insulating cosmetic sun protection product SP.

The operation of the spray device 101 is as follows:

Starting a spray operation by activating the fluid supply 103 and applying the operating voltage to the electrode 102; Monitoring of the spray operation by means of the safety device 110, the operating voltage being reduced by the safety device 110 to a safety voltage of maximum 120 V direct current if the safety device 110 detects a current flow of more than 10 microamperes;

Reapplying the operating voltage to the electrode 102 if the operating voltage has previously been reduced to the safety voltage within milliseconds by the safety device 110 .

FIG. 2 shows a schematic partial view of a second embodiment variant of a spray device 201 according to the invention in a sectional side view. In principle, reference can be made here to the explanations relating to FIG. 1 and the first embodiment variant shown there. In contrast to this, the spray device 201 comprises a nozzle 205 with a tubular electrode 202 and not with a rod-shaped electrode.

The spray device 201 is designed for spraying a cosmetic liquid F by electrostatic forces and comprises a fluid supply 203 shown purely schematically, a feed device 204 and the nozzle 205. The fluid supply 203 comprises a tank 203a for the cosmetic liquid F and a pump 203b to promote the cosmetic liquid F through the feed device 204 to the nozzle 205. The nozzle 205 comprises a nozzle body 206, a connecting flange 207, a nozzle channel 208, a spray opening 209 and the electrode 202. The fluid supply 203 is connected to the feed device 204 and the feed device 204 is connected to the nozzle 205. The electrode 202 is arranged in the nozzle channel 208 . Here, the electrode 202 is such in the Nozzle channel 208 is arranged such that it has a distance D of 1.5 mm from the spray opening 209 measured along a longitudinal axis L208 of the nozzle channel 208, this distance being up to 2.1 mm and at least 0.7 mm or less in variant embodiments of the spray device can.

The tubular electrode 202 is arranged centrally in the nozzle channel 208 and rests with a lateral surface M202 on an inner lateral surface IM208 of the nozzle channel 208 . The nozzle channel 208 runs through the connecting flange 207 and the nozzle body 206 and ends in the spray opening 209 formed in the nozzle body 206. An end 202a of the electrode 202 opposite the spray opening 209 in the nozzle channel 208 is flat in the shape of a circular ring disk.

One coming from a high voltage source 211

High-voltage feed line 212 is designed as a baffle plate 213, with which the electrode 202 is connected to a second end 202b lying opposite the first end 202a. In this case, the baffle plate 213 in the area of the nozzle channel 208 comprises an annular contact 213a.

The spray device 201 is operated with a power of at least 14 milliwatts and at most 100 milliwatts. In this case, the power is selected to match the liquid F to be sprayed and to match the application and to match the number of nozzles. The spraying device 201 shown in FIG. 2 can—as shown—be equipped with a nozzle 205 and alternatively also with further nozzles, these then being constructed in a manner comparable to the nozzle shown and forming a nozzle array. Like the first variant, the second variant also includes a safety device 210. The cosmetic liquid F is an electrically insulating liquid EF and is designed as a liquid and electrically insulating cosmetic sun protection product SP.

FIG. 3 shows a schematic partial view of a third embodiment variant of a spray device 301 according to the invention with a nozzle 305, which includes a contact body 340, in a sectional side view.

As in the second embodiment variant shown in FIG. 2, one electrode is a tubular electrode

302 trained. In contrast to this, however, the electrode 302 is not contacted by means of a ring-like contact, but by means of the contact body 340, which also forms a connecting flange 307 and is accommodated in a nozzle body 306. The contact body 340 encases the tubular electrode 302 up to a first end 302a, with which this is located opposite a spray opening 309 of the nozzle 305.

The spraying device 301 is designed for spraying a cosmetic liquid F by electrostatic forces and comprises a fluid supply 303 shown purely schematically, a feed device 304 and the nozzle 305. The fluid supply

303 comprises a tank 303a for the cosmetic liquid F and a pump 303b for conveying the cosmetic liquid F through the feed device 304 to the nozzle 305. The nozzle 305 comprises the nozzle body 306, the connecting flange 307 formed by the contact body 340, a nozzle channel 308, the spray orifice 309; and the electrode 302. The fluid supply 303 is connected to the delivery device 304 and the delivery device 304 is connected to the nozzle 305. The electrode 302 is arranged in the nozzle channel 308 . In this case, the nozzle channel 308 is essentially through the contact body 340 educated. The tubular electrode 302 is arranged in the nozzle channel 308 in such a way that it is at a distance D from the spray opening 309 of 1.5 mm measured along a longitudinal axis L308 of the nozzle channel 308, this distance being up to 2.1 mm and can be at least 0.7 mm or less.

The tubular electrode 302 is arranged centrally in the nozzle channel 308 and rests with a lateral surface M302 on an inner lateral surface IM308 of the nozzle channel 308 . The nozzle channel 308 runs through the connecting flange 307 formed by the contact body 340 and the nozzle body 306 and ends in the spray opening 309 formed in the nozzle body 306. The end 302a of the electrode 302 opposite the spray opening 309 in the nozzle channel 308 is flat in the shape of a Annular disk formed.

A high-voltage supply line 312 coming from a high-voltage source 311 is connected via a ring-like contact 313a to a base 340b of the contact body 340 embodied as a sleeve-like plug 341 . The contact body 340 is designed to taper in the manner of a cone towards the spray opening 309 .

The spray device 301 is operated with a power of at least 14 milliwatts and at most 100 milliwatts. In this case, the power is selected to match the liquid F to be sprayed and to match the application and to match the number of nozzles. The spraying device 301 shown in FIG. 3 can—as shown—be equipped with one nozzle 305 and alternatively also with further nozzles, these then having a structure comparable to that shown. Several nozzles then form a nozzle field. Like the first and the second variant the third variant also includes a safety device 310.

Figures 4 to 6 show perspective partial views of a fourth embodiment of a spray device 401 according to the invention with a contact body 440. Here, Figures 4 and 5 are designed as exploded views. The fourth embodiment variant of the spray device 401 comprises three nozzles 405-1, 405-2 and 405-3, with the three nozzles 405-1, 405-2 and 405-3 forming a nozzle field 450 and with the first nozzle 405-1 being described below as an example is described in more detail.

2 and in the third embodiment shown in FIG. 3, an electrode 402 (see FIG. 6) of the first nozzle 405-1 of the fourth embodiment is designed as a tubular electrode 402. Similar to the third embodiment, the electrode 402 is contacted by the contact body 440 . In contrast to the third embodiment variant, the contact body 440 is not held by a nozzle body, but rather by a connecting flange 407 . The contact body 440 encases the tubular electrode 402 in the region of a second end 402b, which is opposite a first end 402a, with which the electrode 402 is opposite a spray opening 409 of the first nozzle 405-1.

The spraying device 401 is designed for spraying a cosmetic liquid F by electrostatic forces and includes a device that is only shown schematically in FIG Fluid supply 403, a supply device 404 shown as an example and schematically only in FIG. 4 and only for the third nozzle 405-3, and the three nozzles 405-1, 405-2 and 405-3 mentioned. The fluid supply 403 comprises a tank 403a for the cosmetic liquid F and a pump 403b for conveying the cosmetic liquid F through the feed device 404 to the nozzles 405-1, 405-2 and 405-3. The nozzle 405-1 comprises the nozzle body 406, the connecting flange 407, the contact body 440, a nozzle channel 408, the spray opening 409 and the electrode 402. The fluid supply 403 is connected to the feed device 404 and the feed device 404 is connected to the nozzle 405-1 , 405-2 and 405-3 connected. The electrode 402 is arranged in the nozzle channel 408 . In this case, the nozzle channel 408 is formed by the contact body 440 in a lower third remote from the spray opening 409 and by the connecting flange 407 and the nozzle body 406 in the two upper thirds. The electrode 402 is arranged in the nozzle channel 408 in such a way that it is at a distance D of 1.5 mm from the spray opening 409, measured along a longitudinal axis L408 of the nozzle channel 408, this distance being up to 2.1 mm and at least can be 0.7 mm or less.

The tubular electrode 402 is arranged centrally in the nozzle channel 408 and rests against an inner lateral surface IM408 of the nozzle channel 408 with a lateral surface M402 in the area of the contact body 440 and in an area of the connecting flange 407 close to the spray opening 409 . The nozzle channel 408 runs through the contact body 440, the connecting flange 407 and the nozzle body 406 and ends in the spray opening 409 formed in the nozzle body 406. The end 402a of the electrode 402 opposite the spray opening 409 in the nozzle channel 408 is flat in the shape of a circular ring disk educated. A high-voltage supply line 412 coming from a high-voltage source 411 (shown only in FIG. 4), which is designed as a guide plate 413, is connected via a ring-like contact 413a to a shoulder 440c of the contact body 440 designed as a sleeve-like plug 441. The contact body 440 is designed to taper in the manner of a cone towards the spray opening 409 . The contact bodies of the second nozzle 405-2 and the third nozzle 405-3 are also contacted via the baffle plate 413.

The spray device 401 is operated with a power of at least 14 milliwatts and at most 100 milliwatts. In this case, the power is selected to match the liquid F to be sprayed and to match the application and to match the number of nozzles. The spray device 401 shown in FIGS. 4 to 6 can, as shown, be equipped with the three nozzles 405-1, 405-2 and 405-3 and alternatively also with further nozzles or only two nozzles or only one nozzle.

Like the first, the second and the third embodiment variant, the fourth embodiment variant - as shown exclusively in Figure 4 - also includes a safety device 410, shown only schematically.

The cosmetic liquid F is an electrically insulating liquid EF and is designed as a liquid and electrically insulating cosmetic sun protection product SP. List of references:

101 spray device

102 rod-shaped electrode

102a first end of 102

102b second end of 102

103 fluid supply 103a tank from 103 103b pump from 103

104 feeder

105 nozzle

106 nozzle body of 105

107 connection flange of 105

108 nozzle channel of 105

109 spray opening of 105

110 safety device 111 high voltage source 112 high voltage supply line 111 113 guide plate 113a ring-like contact of 113

113b web of 113

201 spray device

202 tubular electrode

202a first end of 202

202b second end of 202

203 fluid supply 203a tank from 203 203b pump from 203

204 feeder

205 nozzle

206 nozzle body of 205 207 connection flange of 205

208 nozzle channel of 205

209 spray opening of 205

210 safety device 211 high voltage source 212 high voltage supply line 211 213 guide plate 213a ring-like contact of 213

301 spray device

302 tubular electrode 302a first end of 302

303 fluid supply 303a tank from 303 303b pump from 303

304 feeder

305 nozzle

306 nozzle bodies from 305

307 connection flange of 305

308 nozzle channel from 305

309 spray opening of 305

310 safety device

311 high voltage source

312 high voltage lead 311 313a ring-like contact of 313

340 contact body 340b bottom of 340

341 sleeve-like plug

401 spray device

402 tubular electrode

402a first end of 402

402b second end of 402 403 fluid supply

403a tank from 403

403b pump from 403

404 feeder

405-1 first nozzle

405-2 second nozzle

405-3 third nozzle

406 nozzle body from 405

407 connection flange of 405

408 nozzle channel from 405

409 spray opening of 405

410 security device

411 high voltage source

412 high voltage lead 411

413 baffle 413a ring-like contact of 413

440 contact body 440c heel of 440

441 sleeve-like plug

450 nozzle field

D Distance between 102 and 109 or 202 and 209 or 302 and 309 or 402 and 409

EF electrically insulating liquid

F cosmetic liquid

IM208 inner lateral surface of 208 IM308 inner lateral surface of 308 IM408 inner lateral surface of 408 LI08 longitudinal axis of 108 L208 longitudinal axis of 208 L308 longitudinal axis of 308 L408 longitudinal axis of 308

M202 lateral surface of 202 M302 lateral surface of 302 M402 lateral surface of 402 SP sun protection product

Claims

Expectations :

1. Spray device (101; 201; 301; 401) for spraying a cosmetic liquid (F) by electrostatic forces, comprising:

- a fluid supply (103; 203; 303; 403),

- at least one feed device (104; 204; 304; 404),

- at least one nozzle (105; 205; 305; 402-1, 405-2, 405-3),

- wherein the nozzle (105; 205; 305; 402-1, 405-2, 405-3) has a nozzle body (106; 206; 306; 406), a connecting flange (107; 207; 307; 407), a nozzle channel ( 108; 208; 308; 408), a spray opening (109; 209; 309; 409) and an electrode (102; 202; 302; 402),

- wherein the fluid supply (103; 203; 303; 403) is connected to the feed device (104; 204; 304; 404),

- wherein the feeding device (104; 204; 304; 404) to the nozzle

(105; 205; 305; 402-1, 405-2, 405-3) is connected,

- wherein the electrode (102; 202; 302; 402) in the nozzle channel

(108; 208; 308; 408) is arranged, characterized in that

- that the electrode (102; 202; 302; 402) is arranged in the nozzle channel (108; 208; 308; 408) in such a way that it extends along a longitudinal axis (L108; L208; L308; L408) of the nozzle channel (108; 208; 308; 408) measured distance (D) of at most 2.1 mm and at least 0.0 mm, in particular at least

0.1 mm, preferably at least 0.7 mm.

2. Spray device according to claim 1, characterized in that at the electrode (102; 202; 302; 402) during operation of the spray device (101; 201; 301; 401) an operating voltage of at most 10 kV and in particular from about 7 kV to 8 kV applied.

3. Spray device according to at least one of the preceding claims, characterized in that the spray device

(101; 201; 301; 401) includes a safety device (110; 210; 310; 410) by which the operating voltage is reduced to a safety voltage of maximum 120 V direct current and preferably 0 V if a safety device (110; 210; 310 ; 410) detects a current flow greater than 10 microamps, and preferably greater than 4 microamps.

4. Spray device according to at least one of the preceding claims, characterized in that an operating current of about 2 microamperes flows in a trouble-free spray operation.

5. Spray device according to at least one of the preceding claims, characterized in that the electrode (102) is designed as a rod-shaped electrode (102) which is arranged in the nozzle channel (108), or that the electrode (202;

302; 402) is designed as a tubular electrode (202; 302; 402) which is arranged in the nozzle channel (208; 308; 408), wherein the tubular electrode (202; 302; 402) has in particular a lateral surface (M202; M302; M402 ) rests against an inner lateral surface (IM208; IM308; IM408) of the nozzle channel (208; 308; 408).

6. Spray device according to at least one of the preceding claims, characterized in that one of the spray opening

(109; 209; 309; 409) opposite end (102a; 202a; 302a; 402a) of the electrode (102; 202; 302; 402) is flat.

7. Spraying device according to at least one of the preceding claims, characterized in that the spraying device (101; 201; 301; 401) operates with a power of at least 14 milliwatts and at most 100 milliwatts.

8. Spray device according to at least one of the preceding claims, characterized in that the cosmetic liquid (F) is an electrically insulating liquid (EF) and in particular a liquid and electrically insulating cosmetic sun protection product (SP).

9. Spray device (301; 401) according to at least one of the preceding claims, characterized in that the nozzle (305; 405-1, 405-2, 405-3) comprises a contact body (340; 440), the contact body (340 ; 440) a section of the electrode (302; 402) is encased and connected to a high-voltage supply line (312; 412), the contact body (340; 440) being formed from an electrically conductive synthetic polymer, preferably from an electrically conductive silicone, wherein it is provided in particular that the contact body (340; 440) forms a contact resistance between a contact point (413a) and the section of the electrode (302; 402) to provide a current flow for a switch-off sensor system, with the resistance preferably being less than or equal to 700 megaohms Is formed, particularly preferably less than or equal to 7 mega ohms, it being provided in particular that the contact body (340; 440) as a plug (341; 441) is formed, wherein it is esp special provision is made for the contact body (340) to form the connecting flange (307) and in the nozzle body (306; 406) is accommodated or that the contact body (440) is accommodated in the connecting flange (407), it being provided in particular that the high-voltage supply line (312; 412) is designed as a guide plate (313; 413) and the contact body (340; 440 ) is contacted by means of the guide plate (313; 413) and It is provided that the contact body (340; 440) tapers towards the spray opening (309; 409) in the manner of a cone.

10. Method for operating a spray device (101; 201; 301; 401), which is designed in particular according to at least one of claims 1 to 9, comprising the steps:

Starting a spray operation by activating a fluid supply (103; 203; 303; 403) and applying an operating voltage of at most 10 kV and in particular of about 7 kV to 8 kV to an electrode (102; 202; 302; 402);

Monitoring of the spraying operation by means of a safety device (110; 210; 310; 410), the safety device (110; 210; 310; 410) reducing the operating voltage to a safety voltage of 120 V DC and preferably 0 V when

Safety device (110; 210; 310; 410) a current flow of more than 10 microamperes and preferably more than 4 microamperes is detected.

11. The method according to claim 10, characterized in that the operating voltage is applied to the electrode (102; 202; 302; 402) again within milliseconds by the safety device (110; 210; 310; 410) after shutting down to the safety voltage.

12. Nozzle (105; 205; 305; 405-1, 405-2, 405-3) for a spray device (101; 201; 301; 401) for spraying a cosmetic liquid (F), which is used in particular as an electrically insulating liquid ( EF) is formed by electrostatic forces comprising:

- a nozzle body (106; 206; 306; 406),

- a connecting flange (107; 207; 307; 407), - a nozzle channel (108; 208; 308; 408),

- a spray orifice (109; 209; 309; 409) and

- an electrode (102; 202; 302; 402),

- wherein the electrode (102; 202; 302; 402) in the nozzle channel

(108; 208; 308; 408) is arranged, characterized in that

0.1 mm, preferably at least 0.7 mm.

13. Nozzle array (450) for a spray device (101; 201; 301;

401) for spraying a cosmetic liquid (F) by electrostatic forces, characterized in that the array of nozzles (450) comprises at least three nozzles (105; 205; 305; 405-1, 405-2, 405-3) according to claim 12 .

14. Nozzle array according to claim 13, characterized in that the longitudinal axes (L108; L208; L308; L408) of the nozzle channels (108; 208; 308; 408) are aligned parallel to one another.

15. Nozzle field according to claim 14, characterized in that the cosmetic liquid (F) is an electrically insulating liquid (EF) and in particular a liquid and electrically insulating cosmetic sun protection product (SP).