EP3248254B1 - Emission tip assembly and method for operating same - Google Patents

Description

The invention relates to an emission tip arrangement on high-voltage electrodes for charging or discharging substrates, with at least one emission tip, and with a carrier body made of an insulating material, which has at least one high-resistance series resistor and is arranged on a metal profile provided with an insulating potting, the at least one emission peak can be connected to a high-voltage connection via the series resistor. The metal profile can be grounded and provided with an insulating layer and the series resistor can be arranged on the metal profile in an electrically insulated manner. The invention also relates to a method for operating such an arrangement in alternating voltage at a certain peak voltage and a method for operating an emission tip arrangement with auxiliary air supply.

Passive and active discharge electrodes or active charging electrodes are known in a large number of embodiments and variants. Frequently, such electrodes have several emission tips which are arranged in a single row, in two rows or also as a flat emission tip array in different grid widths in such a way that they resemble a fakir board, for example. Very often such emission peaks are embedded together with a current-limiting resistor in elongated U-profiles by means of insulating cast resin. The electrical resistance is assigned either to each individual peak or n-peaks. In practice, passive discharge electrodes are often used without current-limiting resistors.

In the presence of an electric field, the highest possible electric field strength should be effective in an arrangement of emission tips of active and passive high-voltage electrodes at the tips. In addition to complying with other boundary conditions, the respective tip would have to protrude sufficiently far from the insulating embedment. This can be compared with the necessarily free-standing end of a lightning rod above the object to be protected.

However, when such electrodes are used in practice, it is precisely this condition of the free-standing tip that is subordinate to occupational safety for good reason. In order to minimize the risk of injury to the machine personnel on electrodes with emission tips of this type, the usually rigid and massive emission tips hardly protrude from the insulating encapsulation of the electrode profile. Often the two legs of the mostly U-shaped profile cross-section are designed in such a way that they form a plane with the tips so that the risk of injury remains minimal even if the electrode body is accidentally touched from the side.

The disadvantage here is that this spatial proximity of the emission tip to the surface of the profile body considerably reduces the electric field strength at the tip under the usual operating conditions, since large field areas of the electric field with the free tip end becoming shorter increasingly through the insulating body onto the conductive, cast conductor of the Reach through the inner electrode structure and therefore do not end up at the free-standing tips as intended, in order to generate the highest possible field strength there.

If discharge electrodes are operated passively, this is done, for example, with a significant increase in the corona use based on the surface potential to be discharged hand in hand. The term corona use describes the voltage at which free charge carriers, i.e. electrons and ions of both polarity, are generated in front of the tips by impact ionization, which ultimately cause the passive discharge; the gas between the tips and the charged object surface becomes conductive. In other words, under such non-optimal corona use conditions, the object surface to be passively discharged remains at a higher potential, or: the less the emission tip protrudes from the potting, the lower the passive discharge power of the electrode.

For actively operated discharge electrodes, in the case of short peaks, under the geometrical conditions explained, the alternating operating voltage of the electrode required to generate a sufficient number of air or gas ions must be increased for the desired active discharge effect, which reduces the efficiency of the active discharge capacity. High operating voltages in the kilovolt range entail further disadvantages for the operation of such electrodes, namely reduced operational reliability, the disruptive proximity to earthed machine parts and, last but not least, higher manufacturing costs, both for the electrode and for the high-voltage power supply.

For positively or negatively operated direct voltage (DC) charging electrodes, a non-free-standing tip has the disadvantage that the charging current required for the application can only flow at a higher operating high voltage. The resulting disadvantages are comparable to those of the active discharge electrode. For the sake of completeness, it should be mentioned that this naturally also applies to special, bipolar operated DC discharge electrodes.

From the DE 197 11 342 A1 For example, an active electrode operated with AC high voltage is known, its structure corresponds to what was said before. The rigid emission tips of the arrangement there protrude only minimally from the insulating cast resin and the two legs of the U-shaped profile end approximately at the height of the tips.

We also know from the DE 10 2011 007 138 A1 a version of special high-voltage polymer resistors in connection with rigid emission tips, which are used as semi-finished products in the manufacture of high-voltage electrodes.

The EP 1 241 755 A2 in contrast discloses an active discharge electrode with air assistance. Here you can even find emission peaks that are deeper than the insulating surroundings of the air duct or air nozzle.

Comparably unfavorable conditions can also be found with the usual commercially available charging electrodes with and without air assistance, known for example from DE 20 2004 014 952 U1 .

From the U.S. 1,782,340 A an electrode arrangement is known in which emission tips are designed in the form of an elastic metal spring. However, there is a glaring safety risk with this arrangement, since life-threatening short-circuit currents can flow in the event of contact due to the absence of a series resistor.

From the U.S. 1,735,494 A (D3) an electrode arrangement is also known in which emission tips are designed in the form of an elastic metal spring. With this arrangement, the current flow is capacitively limited when the emission peaks are touched. However, even with such a procedure it cannot be avoided that high Develop influenza charges during operation, since direct current components cannot flow away via the capacities used. There is therefore a risk of electrical breakdowns due to the possible electrostatic charge.

Out DE 197 11 342 A1 an active DC discharge electrode for minimizing positive or negative charges on moving material webs is known, with a large number of needle-shaped individual electrodes arranged parallel to one another. For a particularly efficient formation of an electrical field in the area of the individual electrodes, grounded conductors are provided on both sides of the individual electrodes and are embedded in an electrical insulator.

Building on this, the DE 10 2011 007 136 A1 an antistatic device, which has sensor electrodes for detecting polarity as well as positive and negative discharge electrodes operated with direct voltage. In this case, a ribbon-like high-voltage conductor is arranged in a U-shaped electrode body, which can in particular be made of a carbon fiber composite body and supplies the discharge electrodes with high voltage.

In order to be able to produce a high-voltage electrode arrangement as cost-effectively as possible, the suggests EP 0 871 267 A1 propose to arrange a multiplicity of ceramic substrate resistors arranged parallel to one another on a common substrate which is mechanically fixed and electrically contacted by means of a contact spring. Surface-mountable emission tips can simply be soldered onto the surface of the substrate.

The pamphlet JP 2003 284 945 A discloses a discharge electrode having an outer electrode and a inner electrode. The outer electrode consists of a cylindrical conductor in which the inner electrode is arranged. In order to allow an electrical discharge between the electrodes even with a low applied voltage, the outer electrode has a cylindrical surface, the pointed or sharp parts of the inner electrode are arranged opposite one another. When a voltage is applied, an electric field can concentrate on the pointed or sharp parts of the inner electrode, so that a reliable discharge is possible even with a low voltage applied.
The object is therefore to provide an arrangement of emission tips that avoids the aforementioned features and, despite in principle protruding any distance from its carrier body, does not cause injuries in the event of accidental or deliberate contact and in this way allows safe handling with a high degree of efficiency of the arrangement . This object is achieved by an emission tip arrangement of the type mentioned at the outset, in which the emission tip is formed from a spring metal and forms an elastic spring element and a free end of the emission tip stands as a corona tip at a distance from the carrier body. The spring element can for example be designed like a helical spring. This is however not mandatory, other spring designs are also conceivable.

The emission tip or tips of the emission tip arrangement according to the invention are thus formed from a metallic spring material as spring tips and are provided, for example in the manner of a helical spring, that they can protrude as far as desired beyond the electrode body. The emission tip or tips can thus be designed as a metal spring, that is to say, for example, as a spring element which is formed from a metal.

As a result, they, that is to say the emission tips designed as spring tips, do not cause any noteworthy mechanical resistance in the event of unintentional or intentional contact, which would be suitable for causing injuries. This creates the prerequisite for being able to use the functional advantages of such spring tips as emission tips for discharge and charging electrodes in the best possible way.

In accordance with the associated physical laws and can also be proven through tests, the free-standing nib has a significantly lower level, namely a 30% lower level for corona use and therefore improves the effect of passively working discharge electrodes even in the simplest electrode design or also a number of n pen tips. This positive effect of the low amount of corona increases the efficiency of actively working AC discharge electrodes when generating additional bipolar ions with such free-standing corona tips. Depending on the intended use, it is important that the AC discharge electrode with a free-standing spring tip manages with a lower AC operating high voltage for a comparable discharge power. This fact is particularly important in a tight, earthed machine environment Importance.

The transfer of this effect to DC charging electrodes means that the desired electrical current or that required for the charging application can also flow at a lower, but in this case of course, DC operating high voltage.

Correspondingly, in advantageous embodiments of the emission tip arrangement, the high-voltage electrode can be or are actively or passively operated as a charging and / or discharging electrode, with alternating or direct voltage.

With regard to the wear of the emission tip during use, an embodiment of the emission tip arrangement is advantageous in which an end section of the free end of the emission tip, which acts as a corona tip, for example, is bent towards the longitudinal axis of the extension direction of the spring element. Such a last, relatively short section of the emission spring tip, angled towards the center of the helical spring, wears out, for example via the corona flow, over the life of the electrode under almost constant geometric conditions. In contrast to a classic tip, the truncated cone of which would wear out over the corona flow as the diameter increases, the emission spring tip according to the invention has constant geometric relationships over the life of the corona tip and thus the desired constant low corona threshold.

Another advantage is an embodiment of the emission tip arrangement in which the free-standing emission spring tip can also work with air assistance if necessary, which is why the interior of the helical spring element forms a passage that can be connected to a channel of the carrier body, via which the emission tip a Auxiliary air can be supplied is. For this purpose, the emission spring tip, which is free standing outside the electrode body, can be connected to the carrier body, for example embedded in an insulating encapsulation, in such a way that the inside of the carrier body made of insulating material connects the air duct to the inner diameter of the emission spring tip in an air-technical manner and thus the amount of auxiliary air via an air Distribution channel can reach each individual emission spring tip.

The emission spring tip according to the invention is accordingly designed in such a way that the degree of ionization of the amount of auxiliary air used in the case of AC discharge electrodes can be significantly increased compared to known active discharge electrodes with air assistance. The latter is synonymous with considerable cost savings in generating the amount of compressed air required for operation. In addition to the high costs, large amounts of auxiliary air that are not ionized are undesirable or even disruptive in many processes.

The increase in the degree of ionization of the amount of auxiliary air is primarily due to the formation of the corona tip at the free end of the emission spring tip, which is arranged as a thin conductive wire end freely above the center of the air-guiding spring tip. This means that the corona tip can be understood here as the thin conductive end of the wire which is arranged freely above the center of the spring tip, which may be air-conducting. In a further embodiment of the emission tip arrangement, the spring element, for example the inner contour of the spring element, which acts as a limitation for the amount of auxiliary air supplied within the spring element, can expediently taper towards the free end of the emission tip. The last turns of the helical spring tip then run, for example, conically, which leads to a nozzle-like air outlet. The one aimed specifically at the corona tip Auxiliary air supports the ion wind generated by the corona tip and is therefore ionized in the best possible way, which ultimately determines the high degree of effectiveness or ionization as well as the range effect of the amount of ionized auxiliary air offered.

In the case of advantageous developments of the emission tip arrangement with appropriate insulation of the respective carrier body, the carrier body can be made from a thermoplastic or thermosetting plastic or a ceramic material.

In a preferred development of the emission tip arrangement, which in particular allows a simple and easily manageable arrangement of a plurality of emission spring tips, the carrier body can be provided with at least one receptacle located on a side wall for the arrangement of at least one emission tip into which the emission tip can be pressed . In another development, the contour of the emission tip can advantageously be elastically deformable when it is arranged on the carrier body, the contour at this point meaning that the structure forming the shape of the emission tip is elastically deformable so that, for example, the emission tip can be pressed into the receptacle.

A secure conductive connection between the resistor and the respective emission tip can be established in an embodiment of the emission tip arrangement according to the invention by applying the at least one series resistor in a meandering manner to the carrier body and / or contacting the spring element in the area of the receptacle by means of a conductive adhesive. Other configurations of the series resistor are also conceivable at this point.

In the emission tip arrangement according to the invention, the arrangement with the carrier body is accommodated by a grounded metal profile and the series resistor is arranged on the metal profile in an electrically insulated manner, whereby the advantages of the technology of metal profiles can be used. Due to the ease of handling, the metal profile is preferably made of an extrudable material, in particular an aluminum material, and the isolation of the series resistor from the metal profile can be achieved, if possible, by an insulating potting.

For safety reasons, the mentioned metal profiles are always electrically grounded, which means that a large part of the electrons and bipolar ions generated flow off to earth potential, which is why an expedient development of the invention consists in the mentioned metal profile with a thin, both mechanically and electrically sufficiently resistant Provide insulating layer. If the volume resistance of this insulating layer is selected to be> 10 ⁹ Ωm, with a sufficiently high electrical breakdown voltage, then no electrical ohmic current relevant for the electrode function flows through this resistance to earth potential.

A further advantageous embodiment of the emission tip arrangement according to the invention can be provided with a carrier body which has such a capacitance compared to the metal profile, which can be manipulated during its manufacture, that the capacitive reactive current of the high-voltage electrode at least partially compensates for the inductive reactive current of the high-voltage transformer used when operating an active discharge electrode .

With the quality of the electrical insulation, the design-related quality of the capacitance (small loss angle tan δ) of the metal profile increases, both against the cast Carrier body as well as against the free-standing corona tip. This is desirable insofar as high-voltage transformers are used to operate active AC discharge electrodes, which in themselves represent inductive components. The inductive reactive current required to operate the transformer is advantageously largely compensated for by the capacitive reactive current of the capacitance of the entire electrode structure, provided the metal profile is suitably dimensioned. According to the laws of alternating current theory, this means that metal profiles modified in this way require smaller transformer designs to operate the AC electrodes, which, if necessary, form a unit with the electrode. The latter then advantageously avoids the laying of high-voltage cables between the transformer and the electrode. The primary-side AC supply voltage of the transformer can either be the usual mains voltage or the 24 VAC control voltage of electrical systems. In addition to these cost-effective solutions, the supply of the transformer with electrical energy with 24VDC control voltage is an option; however, the necessary AC voltage for the transformer must then be generated via a semiconductor circuit.

The object is also achieved by a method according to claim 17 for operating an arrangement of emission tips with at least one emission tip, according to an arrangement as described above, which is characterized in that the high-voltage electrode is operated in AC voltage with a peak voltage that is lower than the breakdown voltage for the geometry used for the corona tip against the grounded metal profile provided with the insulating layer. The capacitive coupling of the corona tip of the AC discharge electrode to earth potential is advantageously used. The capacitive coupling between the corona tip and the metal profile, which is electrically isolated on the surface but grounded inside, improves the generation of ions from active ones AC electrodes in addition, which is equivalent to an additional significant increase in efficiency. The distance between the corona tip and the insulating layer must be selected so that the peak voltage of the AC operating high voltage is lower than the breakdown voltage for the geometry of the corona tip against the grounded metal profile with the insulating layer. No further, insulated, embedded earth conductors are necessary here.

In addition, the object is achieved by a method for operating an arrangement of emission tips with at least one emission tip that is characterized in that the emission tip is designed as a spring element and a passage is formed through which an auxiliary air quantity is supplied to the corona tip during operation , since the degree of ionization of the auxiliary air volume used with AC discharge electrodes can be increased significantly compared to known active discharge electrodes with air support. The auxiliary air, which is aimed specifically at the corona tip, supports the ion wind generated by the corona tip and is therefore ionized as best as possible, which ultimately determines the high degree of effectiveness or ionization as well as the range effect of the ionized auxiliary air volume offered. It can preferably be provided that the emission tip forms a passage, in particular the aforementioned passage, through which an auxiliary air quantity is or can be supplied to the corona tip during operation.

The above arrangement of emission peaks accordingly has a number of advantages which can be roughly summarized as follows.

By lowering the corona threshold, it is increased passive discharge achieved. This is equivalent to the electrical discharge of charged surfaces down to correspondingly lower residual electrical surface potentials. The lowering of the corona threshold for the free-standing tip also increases the efficiency of active AC discharge electrodes in the additional generation of bipolar ions and electrons. With a comparable discharge power, the level of the required operating high voltage is reduced accordingly.

The series connection of each free-standing spring tip with a high resistance in the order of 10 ⁸ Ω, whereby all resistors are individually connected to the common high-voltage connection, allows the use of such spring tips for passively operated discharge electrodes as well as for actively operated discharge electrodes, as well as for DC charging electrodes in an explosive environment. In addition, DC charging electrodes with an arrangement of such free-standing emission spring tips also require a lower operating high voltage to generate the charging current required for the respective application.

With regard to the support by means of an auxiliary air flow, there is the advantage of more efficient ionization of the auxiliary air quantity to increase the range of the discharge effect of active discharge electrodes for medium and long ranges. The auxiliary air can also only be used for constant or intermittent efficient cleaning of the corona tip in a dirty environment. This is important for both the discharge and the charging electrodes. Charging electrodes, such as those used in so-called "top loading" ESA systems in printing machines, have a significantly longer maintenance interval.

The active discharge with air support and at the same time The reduced AC operating high voltage allows efficient use even in a relatively closely grounded machine environment, such as in packaging processes in the pharmaceutical industry, etc. Here, a large range of the discharge effect and the closely grounded machine environment are no longer a contradiction in terms.

With regard to the design of the end section of the emission spring tip, there is the design-related advantage that the last, relatively short section of the spring tip, angled towards the center of the helical spring, wears out over the life of the electrode under almost constant geometric conditions. In contrast to a classic tip, the truncated cone of which wore out over the corona flow as the diameter increased, the emission spring tip according to the invention has constant geometric relationships over the life of the corona tip and thus the desired constant low corona threshold.

Finally, there is inevitably mechanical contact protection for any length of spring tips that are free standing beyond the electrode body, thanks to the elasticity and associated flexibility of the spring tip.

Fig.1

eine geschnittene Seitenansicht zweier alternativer Elektrodenausführungen mit den für die Funktion erforderlichen Komponenten, einmal ohne mögliche Luftunterstützung mit Metallprofil (unten) und einmal mit Metallprofil und integriertem Luft-Verteilerkanal für eine optionale Luftunterstützung (oben);

Fig. 2

einen Trägerkörper mit mehreren eingebauten Emissions-Federspitzen und aufgebrachten Widerständen und getrennten Luftkanälen für jede Federspitze in einer geschnittenen Seitenansicht (rechts) und einer Draufsicht von oben (links) zur Verdeutlichung der Aufnahmen für die Emissions-Federspitzen;

Fig. 3

eine geschnittene Seitenansicht der erfindungsgemäßen Emissionsspitzen-Anordnung mit Luft-Verteilerkanal aus der oberen Ansicht der Fig.1 in größerer Detailtiefe.

The invention is explained in more detail below with reference to exemplary embodiments in the drawing. It show here in a partially schematic representation

Fig.1

a sectional side view of two alternative electrode designs with the components required for the function, once without possible air support with metal profile (below) and once with metal profile and integrated air distribution channel for optional air support (above);

Fig. 2

a support body with several built-in emission spring tips and applied resistors and separate air channels for each spring tip in a sectional side view (right) and a plan view from above (left) to illustrate the receptacles for the emission spring tips;

Fig. 3

a sectional side view of the emission tip arrangement according to the invention with air distribution channel from the top view of FIG Fig.1 in greater detail.

The Fig.1 shows two emission tip arrangements designated as a whole by 100, in each of which an emission tip 1 can be seen, which is designed as a helical spring-like spring element. The associated emission tip arrangement 100 each has a carrier body 7 made of an insulating material; Fig. 2 recognizable, high-resistance series resistors 13, the at least one emission tip 1 being connectable in each case to a high-voltage connection 14 via the series resistor 13.

In the representations of the Fig.1 the emission tips 1 with the associated carrier body 7 are each received in a metal profile 10, 10a. In the top view, the metal profile 10 has an air distribution channel 9, which continues into the air channel 8 of the carrier body 7, so that an auxiliary air quantity 15 (only in Fig. 3 recognizable) the emission peak 1 can be fed. The bottom view of the Fig.1 with the metal profile 10a the corresponding air distribution channel is missing.

The emission tips for electrical discharge or charging electrodes the Fig. 1 to 3 are operated with an AC or DC high voltage U _g , the series resistor 13 is, for example, by a potting 6 (cf. Fig. 3 ) electrically isolated from the metal profile and arranged on, for example, in particular on, the carrier body 7, which is embedded in a grounded metal profile 10. The emission tip 1 is made of spring metal and has a helical spring-like shape. The free end of the emission tip 1 stands as a corona tip 2 freely above the carrier body 7 and / or above the respective metal profile 10, 10a and / or freely above the associated insulating potting 6 (cf. Fig. 3 ), the end section 3 of the emission tip 1 facing away from the carrier body being bent towards the longitudinal axis of the direction of extension thereof. Therefore, the end section 3 wears down from the corona tip 2 during operation of the electrode under almost constant geometrical conditions, which is to be equated with almost constant emission conditions for the corona current of the corona tip 2.

In the Fig. 2, 3 and the illustration above Fig. 1 it can be seen that the inside diameter of the emission tip 1 is connected to an air duct 8 in the interior of the carrier body 7. The turns of the spring element of the emission tip 1 form a passage 18 in such a way that the amount of auxiliary air 15 reaches each individual emission tip 1 and corona tip 2 via the air distribution channel 9 to improve the ion range. The increase in the degree of ionization of the amount of auxiliary air 15 takes place via the geometric positioning of the corona tip 2 above the center of the emission tip 1. In addition, the increase in the degree of ionization of the amount of auxiliary air 15 is achieved via the conically decreasing diameter of the last turns 4 of the nozzle-like air outlet 5 of the emission tip 1 causes; the amount of auxiliary air 15, together with the nozzle-like air outlet 5, can also only be used for cleaning or

Keep the corona tip 2 clean.

The ones in the Fig. 1 to 3 Emission tips 1 of the emission tip arrangement 100 shown can protrude as far as desired beyond the potting 6 of the metal profile 10 to achieve the highest possible field strength at the corona tip 2, but there is still no risk of injury because the emission tips are designed as spring elements and are elastically flexible. In the Fig. 1 to 3 it can also be seen that the metal profiles 10, 10a connected to earth potential 12 are provided with an insulating layer 11 so that the emission peaks 1 connected to AC high voltage via the adapted capacitive coupling of the corona tip 2 to the respective metal profile 10 or 10a , which can more than double the bipolar ion production compared to conventional electrodes.

The one in the Fig. 1 to 3 The carrier body 7 shown is made of an insulating plastic. In the Fig. 2 it can be seen here that the carrier body 7 is provided in such a way that the emission tips 1 can be pressed into receptacles 17 of the carrier body 7 that are open on one side without a soldering process, in that the diameter of the emission tips 1 is elastically deformed.

One further recognizes in the Fig. 2 that the series resistor 13 is arranged in a meandering shape on the carrier body 7 and electrically contacts the metallic emission tip 1 in the area of the receptacle 17 open on one side by means of a conductive adhesive 16. The design-related capacity of the support body 7 against the metal profile 10 is dimensioned so that the capacitive reactive current, which increases with the electrode length, largely compensates for the inductive reactive current of an AC high-voltage transformer (not shown) for operating the active discharge electrode, which enables very small transformers to be used together with the metal profile 10 can form a unit (not shown). Again the Fig. 3 Turning to this, one recognizes the sectional view of a strand-like metal profile 10, which continues into the viewing plane, is provided with an insulating layer 11 and is U-shaped at its upper end for the observer. Between the legs of the U-shaped profile, a resistance body 7, for example the aforementioned support body 7, with an air duct 8 is received, at the end of which an emission tip 1 is arranged, facing away from the metal profile 10. The emission tip 1 is made of a spring metal as a spring element, its free end tapers for the viewer with its last turns 4 upwards, the end section 3 of its free end forms a corona tip 2, which is bent in the direction of the longitudinal center axis of the emission tip . The cross section of the lower end of the emission tip 1 for the viewer is connected to the air duct 8 so that an auxiliary air quantity 15 can be supplied from the air distribution duct 9 into the cross section, which leads to the air outlet 5 at the corona tip 2. At the end of the metal profile 10 facing away from the emission tip, the latter has a ground connection 12.

Correspondingly, the invention described above relates to an emission tip arrangement 100 on high-voltage electrodes for charging or discharging substrates, with at least one emission tip 1, and with a carrier body 7 made of an insulating material which has at least one high-resistance series resistor 13, the at least one emission tip 1 Can be connected to a high-voltage connection 14 via the series resistor 13. In order to have an arrangement of emission tips available which, despite in principle protruding arbitrarily far from its carrier body 7, does not cause any injuries in the event of accidental or deliberate contact and in this way ensures safe handling The emission tip 1 is made of a spring metal and forms an elastic spring element, and a free end of the emission tip 1 stands as a corona tip 2 both from the support body 7 and from the respective metal profile 10, 10a and the associated one insulating potting 6 spaced freely.

Claims (18)

1. Emission tip assembly (100) for use on high-voltage electrodes for charging or discharging substrates, comprising at least one emission tip (1), and comprising a carrier body (7) which is composed of an insulating material and has at least one high-resistance series resistor (13) and is arranged on a metal profile (10, 10a) which is provided with an insulating potting compound (6), wherein the at least one emission tip (1) can be connected to a high-voltage connection (14) by means of the series resistor (13), characterized in that the metal profile (10, 10a) is connected to earth, in that the assembly (100) is held, by way of the carrier body (7), by the metal profile (10, 10a) and the series resistor (13) is arranged on the metal profile (10, 10a) in an electrically insulated manner, in that the emission tip (1) is formed from a spring metal and forms an elastic spring element, and in that a free end of the emission tip (1), in the form of a corona tip (2), extends freely at a distance from the metal profile (10, 10a) which is provided with the insulating potting compound.
2. Emission tip assembly according to Claim 1, characterized in that the emission tip (1) is in the form of a metal spring.
3. Emission tip assembly according to Claim 1 or Claim 2, characterized in that the corona tip (2) extends freely at a distance, in particular a projection, of between 3 mm and 20 mm, preferably between 4 mm and 6 mm, above the metal profile (10, 10a) which is provided with the insulating potting compound.
4. Emission tip assembly according to one of Claims 1 to 3, characterized in that the emission tip assembly (100) is designed for the or a high-voltage electrode to be able to be operated or to be operated in an active or passive manner as a charging and/or discharge electrode by AC or DC voltage.
5. Emission tip assembly according to one of Claims 1 to 4, characterized in that an end section (3) of the free end of the emission tip (1) is bent in the direction of the longitudinal axis of the direction of extent of the spring element.
6. Emission tip assembly according to one of Claims 1 to 5, characterized in that a passage (18) is formed, in particular through the at least one emission tip (1), which passage is formed in such a way that an auxiliary air quantity (15) can be supplied to the corona tip, preferably in the interior of the emission tip (1).
7. Emission tip assembly according to one of Claims 1 to 6, characterized in that a passage (18) is formed, preferably through the interior of the spring element, which passage can be connected to an air channel (8) of the carrier body (7), by means of which air channel an auxiliary air quantity (15) can be supplied to the corona tip (2).
8. Emission tip assembly according to one of Claims 1 to 7, characterized in that the spring element tapers in the direction of the free end of the emission tip (1), in particular wherein the inner contour of the spring element tapers in the direction of the free end of the emission tip (1).
9. Emission tip assembly according to one of Claims 1 to 8, characterized in that the carrier body (7) is formed from a thermoplastic or thermoset material or a ceramic material.
10. Emission tip assembly according to one of Claims 1 to 9, characterized in that the carrier body (7) is provided with at least one receptacle (17), which is located on a side wall, for arranging the at least one emission tip (1), it being possible to insert, in particular to press, the emission tip (1) into said receptacle.
11. Emission tip assembly according to one of Claims 1 to 10, characterized in that, when the emission tip (1) is arranged on the carrier body (7), in particular when said emission tip is inserted into the receptacle (17), the contour of said emission tip is elastically deformable.
12. Emission tip assembly according to one of Claims 1 to 11, characterized in that the at least one series resistor (13) is mounted on the carrier body (7) in a meandering manner and/or makes contact with the spring element in the region of the receptacle (17) by means of a conductive adhesive (16).
13. Emission tip assembly according to one of Claims 1 to 12, characterized in that the series resistor (13) is arranged on the metal profile (10, 10a) in an electrically insulated manner by an insulating potting compound.
14. Emission tip assembly according to Claim 13, characterized in that the metal profile (10, 10a) is formed from an extrudable material.
15. Emission tip assembly according to either of Claims 13 and 14, characterized in that the metal profile (10, 10a) is provided with an insulating layer (11).
16. High-voltage electrode for charging or discharging substrates, comprising an emission tip assembly (100) according to one of Claims 1 to 15, characterized in that the high-voltage electrode can be operated or is operated in an active or passive manner as a charging and/or discharge electrode with AC or DC voltage.
17. Method for operating an emission tip assembly (100), in particular according to Claim 1 on a high-voltage electrode, comprising a metal profile (10, 10a), which is connected to earth and is provided with an insulating layer (11), and at least one emission tip (1), which has a corona tip (2) of a specific geometry, characterized in that the high-voltage electrode is operated in AC voltage with a peak voltage which is lower than the breakdown voltage for the used geometry of the corona tip (2) to the metal profile (10, 10a).
18. Method for operating an emission tip assembly (100) according to one of Claims 1 to 16 comprising at least one emission tip (1), characterized in that the at least one emission tip (1) is in the form of a spring element, and in that a passage (18) is formed, preferably by the at least one emission tip (1), an auxiliary air quantity (15) being supplied, preferably continuously or at intervals, to the corona tip (2) through said passage during operation.

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