JPH07505337A - Method and apparatus for powder coating - Google Patents

Abstract

Proposed is a method of powder-coating electrically conducting workpieces (1) with a coating powder, in particular a paint coating powder. The method comprises the following steps: first, the optionally cleaned and/or surface-treated workpiece (1) is heated inductively by means of an inductor (2) to the processing temperature or melting or softening point of the coating powder. The coating powder is then sprayed on to the inductively heated workpiece (1) by means of a spraying device (3, 8) so that the coating powder is at least fused on to the inductively heated workpiece (1) by the heat of the workpiece (1).

Description

[Detailed description of the invention] Method and apparatus for powder coating The present invention provides a method for powder coating electrically conductive articles with coating powders, in particular powder coatings. Regarding the method and 3Ii arrangement.

Methods and apparatus for powder coating have been known for some time. Basically powder coating belongs to the technical field of surface treatment, and the process involves the surface treatment of articles by the action of heat. This is done in an environmentally friendly manner by painting the surface. Conventional paints containing solvents In contrast to painting, in this method the coating powder, i.e. the powder coating, is The coating powder is applied to the surface under heat action until a uniform coating is applied to the surface. It will dissolve.

However, it is absolutely necessary that the coating powder adheres to the surface to be painted. Therein lies the fundamental problem with powder coating. This before heat treatment for painting The need for adhesion is achieved by an electrostatic powder coating process, which It is already known as a technique in which particles with opposite charges attract each other. Based on facts. Therefore, materials suitable for powder coating must be electrically conductive or thermally conductive. It is the only solid that is stable. Household appliances, garden supplies, car accessories - 1 equipment The conventional method is to paint wire products, various parts, decorative items, etc. using this method. Ta.

The previously known method involved filling a supply container with dry-exploded paint powder and turning it into a fluid. , stirred, and sprayed with compressed air into the gun. It was done in a certain way. With the spray gun, a low voltage of about 10 volts is cascaded inside the gun. converted to high voltage by the code principle.

One or more electrodes apply between 60 kilovolts and 100 kilovolts to the powder during spraying. Gives a voltage of kilovolts. An electric field is created between the gun and the grounded article.

The powder particles follow their electric field lines and, as a result of their residual charge, give f= to the article being coated. I will wear it. Articles treated in this way are sent to the primary dryer either by hand or by machine. It is transported by plastic, where it is composed of mostly plasti and tsuku. The coating is heated at temperatures reaching 200°C so that the coating powder is melted and a smooth coating is formed. be made to be cured. When enamel powder is used as coating powder, its temperature is about 8 Must be 00°C.

When certain types of coatings are manufactured, coating powders are primarily composed of thermoplastic and thermosetting materials. Contains plastic.

However, in principle, coating using such powder is possible, and its melting temperature The temperature is below the melting temperature of the article being coated. In the past, especially epoxy resin Similar to powder, polyester resin powder and polyurethane powder have been proven to have H effect. It has been made clear.

However, what is common to all methods of powder coating is that the paint used in the application The problem is that the powder must be attached to the article being painted in some way. There is. What means and methods are necessary for this purpose?

In many cases, it requires expensive equipment and the use of so-called adhesives. It will lead you to use it. These may interfere with the painting itself or may be harmful to the environment. or cause serious problems.

Additionally, known methods and equipment for powder coating ensure that the coating powder deposited on a surface is uniform. Articles to be painted are always placed in a furnace or small There was a problem in that it needed to be heated in a room, for example. Therefore, heat acts on the article from the outside, so depending on the heat treatment time, the outside of the article exhibiting a temperature gradient inward from the Applying known methods of final coating, for example, coating long vibrators, etc. Because it requires a large external industrial furnace and itself requires a high energy source, Very uneconomical.

Finally, in the known method, heat from the outside ends up entering the inner wall unevenly, so , it is very difficult to effectively paint the inner surface of the vibrator, even in that case, the object It would be fine to take a very long heating time to heat the entire product, but It's expensive.

It is therefore an object of the present invention, both an apparatus and a method for powder coating, to apply a coating powder that can be used to coat objects in a simple manner, and , it is now possible to paint the inside of hollow bodies such as vibrators without any problems. It is to be.

The method of the invention comprises coating a conductive article with a coating powder, in particular a powder coating; solves the above problems and is characterized by the process (method) of claim 1. ing. Therefore, the method of the present invention is carried out by the following steps. Firstly , the article to be painted, which has been cleaned and/or surface treated, if necessary. (electromagnetic) induction to the processing temperature, melting temperature (melting point), or softening temperature of the coating powder. The coating powder is sprayed by the equipment immediately after heating, i.e. immediately after heating. is sprayed onto the inductively heated article. The item is already heated. paint powder dissolves as soon as it hits the top of the article and no additional adhesive is required. In this way, the coating powder adheres to the article. of goods by inductive heating The temperature that should be maintained on the surface is not only due to the melting of the coating powder, but also due to the surface tension generated. adjusted to form a smooth and uniform surface.

Therefore, the present invention provides, on the one hand, the ability to deposit coating powder on the article to be coated. On the one hand, the problem of having to paint from the outside is solved. eliminates the need for large industrial furnaces that are unavoidable when heating articles so that the article is actually painted in its heated state immediately after it is heated. , the problem is solved by inductively heating the article before the paint powder is sprayed. 1. In the method of the present invention, it is recognized that the coating powder applied to the article The sprayed paint powder is then dissolved using expensive methods and expensive equipment. There is no need to use any of the expensive industrial furnaces for However, one operation with independent steps of deposition and dissolution, i.e., inductive heating and its The time delay between heating and painting is negligible. Ru. The two combined operations take place in one place, thus avoiding wasted time. , thus eliminating the need for costly transportation from one workshop to another. .

Regarding the actual painting process, the heating phase in which the spraying of the paint powder is preceded by a dielectric It is particularly effective if the heating and spraying are started after .

To complete the painting process, the dielectric is deactivated and the remaining area is completely painted. Loading powder is sprayed.

If the article to be painted is a long and narrow part 1, such as a shaft or a If so, it has a symmetrical shape even during rotation, so it can be heated by induction and sprayed onto it. The article can also be rotated about its longitudinal axis. I like it Alternatively, the tightening can be performed by a device. As a result, in this case, all uniform paint - one elongated part, 7. In other words, the vibrator sprays and attaches the derivative. The device is stationary when the inductor and jet are installed so that the device rotates within the effective range of the device. can be placed in

Furthermore, while being induction heated and sprayed, the article is It is relatively movable. In other words, the inductor and the spraying device are relative to the article. It is movable. This relative movement occurs in the axial direction of the article and therefore Therefore, tightening is based on the rotational movement of the article caused by the device and on either the article or the derivative. The associated axial movement means that the article, e.g. a vibrator, effectively The sprayer can be refilled with a device so that the entire length can be painted. Wear.

Particularly in the case of painted vibrators, the pipe wall is The induction heating device is equipped with a second jet, which also sprays into the vibrator from the inside. The inner wall, i.e. the inner surface and the entire pipe wall so that it can be painted and painted. 6 The present invention is effective if it is designed to completely distribute heat to the body. This development of the method is that the vibrator is heated sequentially from the outside by induction heating. This induction heating extends to the inside of the vibrator. Temptation The device with the sprayer next to the conductor sprays paint powder not only on the inside but also on the outside. With the nozzle installed both on the outside and inside of the vibrator, painting can be done As soon as the powder hits it, it adheres to each surface.

Furthermore, the vibrator can be attached from both the outside and inside sides, preferably independently on each side. The attached dielectric and the corresponding jet are simultaneously applied by the device. Possibly heated or painted. The derivative inserted into the vibrator is a probe ( The probe must be formed in the shape of a rod, preferably a rod, and the two Each derivative is completely independent and can be manipulated in different locations. outside and inside It is also easily possible to partially paint from both sides.

In a particularly effective method, the coating depth also depends on the dielectric and spray speed of the equipment. Adjustable depending on the degree.

In addition, the induction heating device and the rotation speed of the article will affect the coating depth. can also be adjusted.

In a more effective method, surfaces that have already been sprayed with paint powder are coated with dielectrics. It can thus be heated again and is therefore at least partially melted. When the coating powder is dissolved and softened, one surface is coated based on the characteristic surface tension. Can be made smooth. Such reheating can be understood as post-treatment However, kneading is a case in which only adhesion of the coating powder is achieved in the first step.

In any case, by further heating, a given roughness of the surface to be painted can be achieved. In other words, you can adjust the smoothness.

When spraying coating powder onto an induction heated article, it is not necessary to spray it as a jet or as a dot. Rather, spraying is based on the shape of the mist, that is, spraying paint powder over a certain area. Spraying the product is always effective. When doing so, the article may be This means that substantially more powder particles are sprayed than should be sprayed. and the unavoidable environmental waste and inefficiency of such coating powders. spray without melting onto the article to avoid wasting huge amounts of paint powder and reduce costs. It is very effective when the deposited paint powder is removed by special suction equipment. The powder particles will be sucked in, and then the powder particles will be put into the device again. The collection and supply container is then refilled by its suction device so that the spray is supplied to the device. is sent back.

Another object of the invention is the device shown here, characterized by claim 12. and achieve the objectives associated with the equipment. Therefore, preferably, the above-mentioned Powder coating conductive articles with coating powders, in particular with powder coatings, by at least one inductor for inductively heating an article; and at least one The spraying device that sprays the powder on the heated article with the coating powder must have a device. It is therefore characterized. Similarly, in this device, the induction and spray The combined use of the It has been found by the present invention that this defect can be compensated for.

Preferably, the inductor is connected to an inverter and is powered by an alternating current of varying frequency. Be biased. The frequency of the dielectric is the frequency of the eddy currents induced by the dielectric in the article. Preferably, it is steplessly variable to influence the penetrating power, but also In addition, it is easily possible to predetermine the individual steps for the adjustment of different frequencies. be.

If the article to be painted is an elongated part, preferably a pipe, the derivative designed to at least partially surround the article, preferably at an adjustable distance; Can be done. This arrangement allows the derivative to move around the article without relative motion between the article and the derivative. Should be designed to bias the range. In a particularly effective way, The derivative can be designed semicircularly. At least the article to be painted is pipe-shaped. In some cases, a semicircular form of the dielectric can be considered, so that on which side of the entire pipe The derivative can also be moved from the surface. Finally, derivatives also. Roughly speaking It can be formed into a layer shape, and in this case, it can also be used to form objects without affecting the objects. It is possible to place each part halfway around the item and close each part.

In order to securely hold the article to be painted, a device is provided for clamping the article. It is even more advantageous if it preferably has two holding devices. In particular, Suitable as a holding device are certain structures, i.e. holding devices, which hold the articles. The article can be secured by holding both sides of the article, for example, its front edges together.

In a more effective method, the clamping device is rotated in the 514 position, and the retaining device is rotated. driven, so that the clamped article can be placed in rotation. painted The rotational movement of an article heated all around it causes the dielectric to form a semicircular shape, for example. Even if formed, it can be painted without transfer of derivatives, making it very effective. be.

The clamping device can be moved in the axial direction of the article to uniformly coat the entire surface of the article. Therefore, as a supplement to the rotational movement of the article, the tightening device Allows both the entire length to be heated and then painted.

Tightening is the arrangement of the device and the tightening of the article by it, so that the article is fixed horizontally. It can also be done. Similarly, it is possible to fix an article so that it extends vertically. in which the fixed state of the article, both in its arrangement and in its movability, It is necessary to adapt the derivative to the situation.

Similarly, a dielectric is moved linearly along the article.

Therefore, when tightening, the device must perform only a rotational movement to rotate the article. It is conceivable that Additionally, both the inductor and the article can move axially. is possible, so that the inductor and the clamping device can each move half its distance. In this way, the maximum travel distance of the device is effectively reduced by the induction and tightening I am made to do so.

The movement and tightening of the inductor, both in the linear movement of the equipment, affect the painting process. Advantageously, its speed is variable so that it can be dropped.

If the article to be painted is a pipe, spraying is used to paint the inner wall of the pipe. into the pipe, preferably by cross beams, lances or cables Another sprayer can be equipped with a device. But in this case, the heat the pipe from the outside so that the eddy current that generates light has an appropriate penetration power into the pipe. is heated by induction, but it is necessary that sufficient induction heating reaches the inner surface of the pipe. The device with the second spout will be operated parallel to the device with the first spout operated on the outside. , the inside of the vibrator can be painted, and both sprayers operate at roughly the same height. It also moves at roughly the same speed along the vibe.

Simultaneous rotation of the vibrator ensures that the entire object to be painted is coated. I can do it.

As an alternative to the examples mentioned above, it is possible to include additional derivatives. and it is preferably a cross beam, in order to heat the inner wall, It is attached by a lance or cable so that it can be inserted into the vibrator. child The second derivative of is operated on the outside so as to uniformly heat the walls of the entire vibrator. The heating operation of the dielectric can be supplemented.

With regard to the arrangement of the device, it means that when viewed in the direction of movement of the derivative, It is always possible to spray behind the The induction heating part deposits coating powder thereon as a result of heating the article and melts it. In order to distribute it evenly, there are 6 profits.

In this case, the spray device is rigidly connected to the dielectric, e.g. installed with the dielectric in the system. Similarly, this array is induction heated The parts can be constantly sprayed with paint powder, and the direction of movement of the derivative is The movement of the conductor causes the device to follow, resulting in a result that always coincides with the movement. but Therefore, if possible: Clause 11 is possible. The spacing will remain unchanged, at least between painting operations.

In particular, as well as regarding minimizing the waste of paint powder as much as possible. In terms of protecting the environment and avoiding pollution, spraying equipment is connected to a suction device. the suction device removes undissolved powder particles from the surface of the article by suction. It is further advantageous because it is used to remove The suction device is essentially a funnel-shaped A hood may be provided, which at least partially surrounds the spray + A position. in other words, at least formed around the article and curved most likely to ensure effective suction, i.e. Suction adapted to the various shapes of the articles to be coated to catch excessive particles of coating powder It's a hood.

A suction device can transfer the removed powder to a collection container. Similarly, The suction device is equipped with a spout so that it can re-supply the removed powder directly to the device. The attachment can be effectively connected to the supply container of the device.

Finally, especially the form of the article and the excessive removal of paint powder by suction In terms of preventing spraying, for each item being painted, It is possible to adapt it. For this purpose, the nozzle of the device should be The different nozzle shapes and spraying speeds will need to be changed depending on the device and the feed rate of the induction Therefore, it is also possible to adjust the coating depth.

Various possibilities exist to fully understand and further illuminate the teachings of the present invention. this eye For this purpose, the claims dependent on claims 1 and 12 on the one hand, and the drawings on the other hand, Reference should be made to the detailed description of the invention made by reference.

A detailed description of the preferred embodiments of the invention and further details of the preferred embodiments and teachings are provided with reference to the drawings. I will explain the development.

The only illustration attached is a powdered conductive article by coating powder, partially shown in cross-section. 1 is a schematic block diagram of an embodiment of an apparatus according to the invention for painting; FIG. This fruit The embodiment consists of one dielectric and two spray devices.

This only figure shows an embodiment of the device according to the invention for powder coating conductive articles. It shows. The article is Vibe 1. This example shows the coating powder as a powder coating. Although it is not shown in the figure that it is used in

This is used to paint the surface of the vibrator.

In the method according to the invention, the inductor 2 is inductively It is used to heat the beer. The spraying device 3 is a heated article, That is, coating powder is sprayed onto the vibrator 1.

Further, as shown in the figure, the inductor 2 is connected to the inverter 4, and the inductor 2 is connected to the inverter 4. The inverter 4 applies an alternating current of variable frequency to the inductor 2. For derivative 2 The frequency gIl is the transmission of the eddy current induced in the vibrator I by the dielectric 2. influence on the force, preferably infinitely adjustable.

The figure also shows that the derivative 2 partially surrounds the vibrator 1.

The gap between the vibe l and the derivative 2 is i! Section II is possible. Furthermore, derivative 2 is Approximately semicircular, but circular or pliers shaped with two derivatives can also be easily designed.

In order to hold the vibrator 1, the device 5 is used to tighten the vibrator 1 using two holding devices. It is provided between 6.7 and 7.

The tightening device 5 or the holding device 6.7 in the tightening device 5 is rotatably driven. Therefore, the vibrator 1 held therein cannot be tightened by the device 5. can be rotated. In order to effectively paint the entire length of the vibrator 1, the tightening is Both the device 5 and the guide 2 are movable in the axial direction of the vibrator 1.

In the embodiment selected here, the tightening device iE5 is attached to the article, i.e. 1 is arranged so that it extends vertically in its tightened state. Derivative 2 is 1. In this case, the article, ie the vibrator 1, is linearly moved and rotated.

The moving speed of the guide 2 is adjustable.

“Also, what is shown in the diagram is that the other device with a jet is device 8, and the device with a jet is This is added to 3.

This is used to spray paint the inner wall of the vibrator 1. This spout is equipped with The vibrator is passed through the upper holding device 6 by the cross beam 9 and the lance lO. 1.

The spray device i23,8 sprays coating powder onto the inductively heated part of the vibrator 1. Follow the guide 2 along the direction of movement of the guide 2 so that the This means that the inductively heated area of vibrator 1 is always This is to follow the position of the derivative 2.

Furthermore, the spray device 3 has a common structure, namely the dielectric on the holder 11. 2 is firmly connected. Thus, the device 5 always follows the induction device 2 when spraying. Ru.

Each sprayer is connected to device 13.8 that does not melt on the surface of the vibrator. A suction device 12.13 for removing powder particles. These suction devices 112.1 3 are each provided with a suction hood 14, 15 substantially in the form of a funnel. Suction flap The cords 14.15 are facing towards the vibrator 1, so the spray is on the side of the device. On the other side, the jet completely covers the nozzle of device 3.8.

Another suction device 20 is arranged at the lower end of the vibrator 1. It is designed to act on the entire opening of No. 1. This suction device is is connected to and forms an integral part of.

Finally, Figure 1 shows that the suction device 12.13° 20 is connected to the compressed air hose 1. Via 6, 17.21 the jet is effectively connected to the supply container 18 of the device 3, 8. This is true. Therefore, the removed paint powder is sprayed again by the device 3. ．． 8. The compressed air made available by the pressure cylinder is again Via the compressed air hose 22.23 the sprayer supplies the coating powder again to the device 3.8. It can be made so that

The examples described above serve only for a better understanding of the teachings of this invention. is intended and is not intended to limit the scope of the invention.

Fig, I Procedural amendment November 29, 1994

Claims (1)

[Claims] 1. Processing, melting, softening temperature of coating powder optionally cleaned and/or table The surface-treated article (1) is heated by induction, Spraying coating powder onto the induction heated article (1) by a spraying device (3) The induction heating article (1) is coated with a coating powder, in particular a powder coating, characterized in that How to paint. 2. After being heat-treated by the derivative (2), coating powder is sprayed, and then 2. A method according to claim 1, characterized in that the spraying is continued simultaneously with the heating. 3. The article to be painted (1) is an elongated part, preferably a pipe, and is While being heated and sprayed, the article (1) is preferably placed in a clamping device (5). Accordingly, the invention is characterized in that it can be rotated about its longitudinal axis. Or method 2. 4. While being inductively heated and sprayed, said article (1) is exposed to said dielectric (2). and the spraying device (3), and said derivative (2) and the spraying device (3) are movable relative to each other. Claim characterized in that the device (3) is movable relative to said article (1) Any one method from items 1 to 3. 5. Claim characterized in that the relative movement occurs in the axial direction of the article (1) Method of Section 4. 6. Said article (1) is a pipe, in particular depending on the frequency of the current in said dielectric Inductive heating of the pipe wall occurs up to the inner wall, and said pipe (1) is connected to another jet It is designed to be sprayed and painted from the inside by means of a spraying device (8). 6. A method according to claim 1, characterized in that: 7. Preferably, said pipe (1) is covered by one derivative (2) from the outside and from the inside. or can be heated at the same time, and the spraying device (3, 8) Any one of claims 1 to 5, characterized in that it can be painted. the method of. 8. The feeding speed of the derivative (2) and the spraying device (3, 8), or the article ( 1) The coating depth is controlled by the rotation speed or heating speed. , the method of any one of claims 1 to 7. 9. The surface of the article (1) onto which the coating powder has been sprayed is again coated with the derivative (2). The at least partially dissolved coating powder is thus heated to a melted and softened state. It is characterized by the fact that surfaces can be made smooth based on the characteristic surface tension in the 9. The method of any one of claims 1 to 8, wherein the method comprises: 10. Particles of the sprayed powder that did not adhere to the article (1) are removed by the suction device (12, 13), characterized in that it is removed by suction according to claim 1-9. Either one method. 11. The powder particles removed by suction are transferred to said jet for further spraying. 11. Method according to claim 10, characterized in that it is fed back to the applicator (3, 8). 12. at least one said derivative (2) for induction heating said article (1); and at least one jet for spraying the heated article (1) with coating powder. An article (1) induction heated by coating powder, characterized by a coating device (3), Apparatus for powder coating, preferably according to the method of any one of claims 1 to 11. 13. The said dielectric (2) is connected to an inverter (4) and is connected to an alternating current voltage of variable frequency. 13. Device according to claim 12, characterized in that it can be biased with current. 14. The penetrating power of the eddy current induced in the article (1) by the dielectric (2) The frequency of said derivative (2) for influencing is preferably steplessly variable. 14. The device of claim 13, characterized in that: 15. The article (1) is of elongated shape, preferably in the shape of a pipe, and the the body (2) at least partially surrounds the article (1) at an adjustable distance; 15. A device according to any one of claims 12 to 14, characterized in that: 16. Claim characterized in that said derivative (2) is made approximately semicircular. 15 devices. 17. Said derivative (2) surrounds the pipe (1) in a circular manner, if necessary: It is characterized by being composed of two parts, 16. The apparatus of claim 15. 18. The derivative (2) is characterized in that it has a substantially briar shape. 16. The apparatus of claim 15. 19. A tightening device (5), preferably having two holding devices (6, 7), Any one of claims 12 to 18, characterized in that the product (1) is comprised of: one device. 20. The tightening device (5) and the holding devices (6, 7) of the tightening device (5) rotate. characterized in that the clamped article (1) is rotatable; 20. The apparatus of claim 19. 21. that the tightening device (5) is movable in the axial direction of the article (1); 21. The device of claim 19 or 20, characterized in that: 22. The tightening device (5) allows the article (1) to be tightened horizontally. 22. According to any one of claims 19 to 21, characterized in that the Device. 23. The tightening device (5) is configured such that the article (1) is tightened in a vertical direction. Any one of claims 19 to 21, characterized in that it is arranged so that one device. 24. The derivative (2) is movable linearly along the article (1). 23. Device according to any one of claims 12 to 22, characterized in that: 25. Claim 2, characterized in that the movement of said derivative (2) takes place at a variable speed. 3 device. 26. The article (1) is a pipe, and the other spray device (8) is a pipe. preferably a cross beam for heating the inner wall of said pipe (1). (9) and can be moved into the pipe (1) by means of a lance (10) or a cable. 25. A device according to any one of claims 12 to 24, characterized in that it is capable of 27. The article (1) is a pipe and is provided with another spraying device (8). and preferably a cross beam (9) for heating the inner wall of said pipe (1). ) and (10) or by means of a cable into the pipe (1). 25. A device according to any one of claims 12 to 24, characterized in that: 28. Said spraying device (3, 8) follows said induction body (2), thus Paint powder can always be sprayed onto the heated parts, which parts are coated with said derivatives. (2), when viewed in the direction of movement of the derivative (2), extending behind said derivative (2); 27. The apparatus of any one of claims 12 to 26. 29. Said spraying device (3) is firmly fixed to said dielectric (2), thus , coating powder can always be sprayed onto the induction heated part, which part When viewed in the traveling direction of the conductor (2), the conductor (2) is characterized in that it extends behind the conductor (2). 28. A device according to any one of claims 12 to 27, characterized in that it has the following characteristics: 30. The spray device (3, 8) is connected to a suction device (12, 13). , the suction device removes undissolved powder particles on the surface of the article (1) by suction. 29. Device according to any one of claims 12 to 28, characterized in that it removes. 31. The suction devices (12, 13) are substantially funnel-shaped suction hoods (14, 15). ).) Apparatus according to claim 29. 32. The suction hood (14, 15) is connected to at least the spray device (3, 8). 31. Device according to claim 30, characterized in that it extends partially around the periphery of. 33. Another suction device is provided at the lower end of the pipe, which 33. Device according to claim 32, characterized in that it operates over the entire opening of (1). 34. characterized in that the suction device (20) is connected to the lower holding device (7). 33. The apparatus of claim 32, wherein: 35. characterized in that said suction device (20) is an integral part of the lower holding device (7). 33. The apparatus of claim 32, wherein: 36. The suction device (12, 13, 20) supplies the spray device (3, 8) is connected to a container (18), so that the removed coating powder is transferred to said spraying device. 3 from 30, characterized in that it can be supplied again to (3,8). 4. Any one device. 37. The nozzle of said spraying device (3, 8) is replaceable and has a coating that can be painted. The loading depth depends on the shape and feed speed of the nozzle of the spraying device (3, 8), or the according to claims 12 to 35, characterized in that it is tunable by the derivative (2). Any one device.