EP3315209B1 - System for applying temporarily acting surface function coatings by spraying - Google Patents

Description

The invention relates to a system for applying temporary-acting surface functional coatings by spraying by one or more pneumatic two-fluid nozzles with nozzle body, which is connected to at least one storage vessel, wherein the storage vessel is filled or filled with sprayable surface functional coating liquid and further with a compressed gas, in particular compressed air source which can be connected to the respective two-fluid nozzle in order, according to the principle of a jet pump or injector nozzle, to convey the surface functional coating liquid and to apply it to a surface to be treated by spraying according to the preamble of claim 1 or 12.

From the DE 10 2005 024 005 A1 is a method for edge coating a furniture panel previously known. According to this method, a release agent is applied after gluing a first edge band and before gluing a further edge band extending transversely to the first edge band on the edge corner region of the glued first edge band assigned to the second edge band.

This is intended to ensure that no glue or adhesive residue attach to the already glued edge band or adhere so that a removal is possible only with great effort.

According to an advantageous embodiment according to DE 10 2005 024 005 A1 is intended to spray the release agent, by means of stationary spray nozzles. This should result in a reduction in consumption of the release agent, since this can be applied only in a very thin film.

According to one embodiment of the prior art, spray nozzles are respectively arranged in the edge corner areas of the opposing coated edges, with which a liquid release agent is sprayed onto these edge corner areas of the glued edge band.

Details of the formation of the spray nozzles and the supply of a liquid release agent are not explained in the cited published patent application.

Although the use of release agents, for example based on alcoholic liquids for the purpose of improving the training of glued edgebands of furniture panels for years belongs to the prior art and have extensive experience in the related spraying of release agents, it has been found that the nozzles used A considerable amount of wear and tear is subject with the result that after more or less manageable periods either an insufficient spray jet is given or the amount of release agent to be applied is increased with the result that inadmissible concentrations of partially harmful substances are present at the workplace.

From the foregoing, it is therefore an object of the invention to provide a further developed system for applying temporary-acting surface functional coatings by spraying through one or more pneumatic two-fluid nozzles with nozzle body, wherein the surface function coatings are liquids and in this regard are available in a storage vessel.

The system according to the invention should, under all circumstances of an industrial environment, be able to apply reproducible amounts of the corresponding functional coating by means of spraying, the duration of use of the nozzles being increased and the amount of surface functional coating to be applied being subject to reduction. Thus, the possibility of a reduction of pollutant concentrations at the respective machine or the respective workplace with reduced impairment of the worker to realize.

In this respect, the invention is based on a system for applying temporary-acting surface-functional coatings by means of spraying, wherein the surface-functional coating is to be applied to an object by means of one or more pneumatic two-substance nozzles.

The pneumatic two-substance nozzles have a nozzle body, which communicates with at least one storage vessel, wherein the storage vessel is filled with sprayable surface function coating or can be filled accordingly. Usually for the connection between the respective nozzle and the storage vessel hose connections exist in a known manner.

Furthermore, the respective nozzle body of the corresponding two-fluid nozzle is connected to a compressed gas source, in particular a compressed air source in order to promote the surface functional coating liquid and applied by spraying onto the surface to be treated according to the principle of a jet pump or an injector nozzle.

According to the invention, the connection between the respective two-fluid nozzle, that is, the nozzle body, and the storage vessel is formed sealed. It is thereby prevented that contaminants from the industrial environment enter the storage vessel and may possibly be transported via the surface functional coating liquid through the nozzle towards the surface to be treated with adverse consequences in terms of nozzle wear on the one hand and a possibly insufficient effect of the surface function coating on the surface to be treated.

Furthermore, a provided for pressure equalization on the storage vessel opening is provided with a filter body or a filter insert.

Through the filter body or the filter insert soiling of the ambient air are retained with the same advantage as described above.

The respective two-fluid nozzle of the system according to the invention is designed as a minimum quantity nozzle valve with an adjusting device in the nozzle body.

The adjusting device has, in a first embodiment, a preferably interchangeable needle with conical seat tip. The conical seat tip dips into a form complementary hole in the nozzle body to obtain an annular gap. With adjustment of the needle, the annular gap can be increased or even reduced and thereby the amount of surface functional coating liquid supplied to the spray jet can be specified.

According to the invention, in the region of the apex, the needle has a central first bore oriented in the longitudinal direction of the needle over a predetermined path, which intersects with a second bore oriented in the needle transverse direction, such that even with a closed annular gap, an amount of liquid defined over the bore dimensions can be extracted.

As a result of this design of the first and second bores, the supply of a first quantity of surface functional coating liquid is basically ensured, and with the opening of the annular gap by nozzle adjustment a larger amount of liquid to be supplied can be added.

Also, according to the invention, the risk of clogging of the annular gap is reduced for small annular gap widths, since a suction is created by the liquid quantity supplied via the first and second bores, which optionally entrains particles attached to the annular gap or located there.

In a further development of the invention, the nozzle body for receiving the needle located in a needle holder on a blind hole, wherein the needle holder is screwed into the blind hole.

In this respect, the needle holder has an external thread, which is designed to be complementary to an internal thread of the blind hole bore.

The needle holder in turn has a passage opening for guiding the needle, wherein the passage opening and the needle in turn have complementary threads for needle adjustment.

In order to accomplish the most sensitive adjustment, it is possible that the complementary threads in the through hole (internal thread) and the needle (external thread) are realized as a so-called fine thread.

On the needle holder is still a sealing cap preferably attachable by screwing, which seals the needle against the environment in conjunction with a conventional sealing ring. The cap can be performed as a known stuffing box.

The blind hole is in communication with a guided through the nozzle body first channel, wherein the first channel terminates in an opening for supplying the liquid.

This opening may have a screw thread or a screw connection or pass into such a screw connection in order to be able to produce a hose connection, for example.

The annular gap in turn merges into a second channel, which leads to a third channel, to which the compressed gas source can be connected. Also in this respect, the related end of the third channel to a screw or the like means.

At the intersection of the second and the third channel, a two-substance mixture channel connects, which opens into a nozzle opening of the nozzle body.

In a preferred embodiment of the invention, the pressure equalization opening is formed with filter body in a known closure or screw or bayonet cap of the storage vessel. By such an embodiment of the vessel closure or vessel lid, no changes to the actual storage vessel are required, so that standard vessels can be used here.

In an alternative, it is additionally possible to provide a pressure equalization bore with filter element in the upper neck area of a bottle-type storage vessel.

In addition to the possibility of dosing the surface functional coating liquid according to the invention, it is also possible to adjust the amount of compressed gas to be supplied.

For ease of handling when specifying the surface functional coating liquid to be supplied, the needle has an adjustment aid at its end opposite the cone seat tip.

This adjustment aid can be designed, for example, as a thumbwheel.

In addition, it is possible to provide or attach markings on the needle for reproducible needle adjustment.

In a second embodiment of the invention is based on the basic construction of a similar nozzle body with adjusting device according to the first embodiment.

However, the adjusting device of the second embodiment has no interchangeable needle, but a, possibly interchangeable Schraubeinsatzstück. The Schraubeinsatzstück is preferably designed as a grub screw and can be screwed into a blind hole provided with an internal thread in the nozzle body.

The threaded insert has a central longitudinally oriented first bore which intersects with a second, laterally oriented bore. About the bore dimensions, a defined amount of liquid is sucked. As mentioned, the nozzle body for receiving the Schraubeinsatzstückes a blind hole with internal thread, wherein the Schraubeinsatzstück can be screwed into the blind hole.

Depending on the depth of engagement, a further control option and adjustability is given. If the Schraubeinsatzstück not to complete is screwed to the bottom of the blind hole, but has a bottom-side distance, can be done with the help of a lock nut on the protruding from the blind hole end of the grub screw, respectively the available thread a positional fixation of the grub screw. Surprisingly, it has been shown that it is possible to dispense with additional sealing means in this embodiment.

Also in this embodiment, the blind hole is in communication with a guided through the nozzle body first channel, wherein the first channel terminates in an opening for supplying the liquid.

In the bottom of the blind hole a recess is provided, which merges into a second channel, which leads to a third channel, to which the compressed gas source can be connected.

At the intersection of the second and third channel, in turn, a two-component mixture channel follows, which opens into the nozzle opening of the nozzle body.

The preferably designed as a set screw screw insert is the diameter side in the region of his dipping into the blind hole thread-free end diameter side offset. In this respect, a circumferential gap for liquid supply remains.

Both in the case of the first and the second embodiment of the invention, it is ensured that the remaining, free chamber volume in the blind bore is minimal in order to ensure an optimal suction during use of the nozzle system without turbulence, resulting in an undesirable entrainment Gas particles in the liquid jet and / or lead to a non-uniform liquid jet.

According to one embodiment of the invention, it is possible to provide a union nut on the nozzle opening side. This union nut is capable of receiving an exchangeable, jet-forming orifice in order to ensure as laminar a flow as possible in the area of the nozzle opening over a given distance.

Although the system according to the invention particularly advantageously makes use of the sealed configuration of the storage vessel and the opening with filter body provided for equalizing the pressure in the storage vessel, the two-fluid nozzles according to the first or second embodiment are quite fundamentally suitable for metered application of surface functional coating liquids to a wide variety of surfaces or bodies. The use of a storage vessel with sealed compound two-fluid nozzle and the storage vessel and pressure equalization opening with filter body or filter cartridge is therefore not mandatory, but advantageous.

The system according to the invention with the illustrated two-fluid nozzle is extremely reliable even under very heavy industrial environmental load and corresponding contamination.

Furthermore, it is ensured that the materials of the two-component nozzle, in addition to the necessary connection means for supplying a compressed gas or the surface functional coating liquid, have no such electrical conduction potentials that undesired electrochemical corrosion occurs.

With the aid of the filtered supply of pressure-compensating air, it is precluded that solvent-soluble wood constituents from the environment of an edgebander of the furniture production are introduced via aeration of the storage vessels which receive the surface functional coating liquid.

The invention will be explained below with reference to an embodiment and with the aid of figures.

Fig. 1

eine Längsschnittdarstellung durch die im erfindungsgemäßen System eingesetzte pneumatische Zweistoffdüse mit Düsenkörper gemäß erster Ausführungsform;

Fig. 2

eine Darstellung ähnlich derjenigen nach Fig. 1, jedoch mit teilweise durchsichtig illustriertem Düsenkörper zur Erkennung der Lage des ersten bis dritten Düsenkörper-Kanals;

Fig. 3

eine Längsschnittdarstellung durch die im erfindungsgemäßen System eingesetzte pneumatische Zweistoffdüse mit Düsenkörper und Stelleinrichtung gemäß zweiter Ausführungsform;

Fig. 4

eine Darstellung ähnlich derjenigen nach Fig. 3, jedoch mit düsenöffnungsseitig vorgesehener Überwurfmutter ohne separat dargestellter strahlformender Blende, welche im Betriebsfall von der Überwurfmutter gesichert konzentrisch vor der Düsenöffnung des Düsenkörpers befindlich ist; und

Fig. 5

eine Schnittdarstellung ähnlich derjenigen nach Fig. 1, jedoch mit einer Kegelsitzspitze 4 aus einem Kunststoffmaterial, welches am unteren Ende der verstellbaren Nadel eingesetzt ist, wobei die Kunststoff-Kegelsitzspitze 4 in eine formseitig komplementäre Bohrung 5 im Düsenkörper 1 unter Erhalt eines veränderbaren Ringspaltes 6 eintaucht.

Show here

Fig. 1

a longitudinal sectional view of the pneumatic two-fluid nozzle nozzle body according to the first embodiment used in the system according to the invention;

Fig. 2

a representation similar to that after Fig. 1 but with partially transparent nozzle body for detecting the position of the first to third nozzle body channel;

Fig. 3

a longitudinal sectional view of the pneumatic two-fluid nozzle used in the system according to the invention with nozzle body and adjusting device according to the second embodiment;

Fig. 4

a representation similar to that after Fig. 3 , However, provided with nozzle opening side union nut without separately shown beam-forming diaphragm, which is secured in the operating case of the union nut concentrically located in front of the nozzle opening of the nozzle body; and

Fig. 5

a sectional view similar to that after Fig. 1 but with a conical seat tip 4 made of a plastic material, which is inserted at the lower end of the adjustable needle, wherein the plastic conical seat tip 4 dips into a form complementary hole 5 in the nozzle body 1 to obtain a variable annular gap 6.

The in the Fig. 1 to 5 pneumatic two-fluid nozzles shown used, for example, in a system for applying temporary-acting surface functional coatings by spraying. This may be a special coolant, which is used in a method for processing a board made of wood or a wood-based material, in particular when attaching appropriate edge bands.

In particular, it may be a surface function coating according to the German patent application DE 10 2015 012 825.5 that is to say a sprayable, non-corrosive surface-active coating based on an alcoholic acetate solution, wherein a powder-forming functional substance is added to a melt to embed the corresponding powder particles, then the thus enriched melt by addition of a glycol in a solution transfer and subsequently form associating colloids by introducing into demineralized water as a carrier, which envelop the embedded powder particles, wherein the thus pretreated function determining substance of the alcoholic acetate solution is added.

The function-determining substance may be polytetrafluoroethylene (PTFE) nanoparticles, but also metallic powders or inorganic pigments.

The aforementioned melt is provided on the basis of non-ionic, low-foam surfactants, in particular on the basis of block copolymers.

The enriched melt can be added to hexylene glycol. The total mixture has salt for ion formation.

It is pointed out that the surface function coating briefly described above has a minimum water content of in particular <2% in the total mixture.

The aforementioned surface function coating is suitable for cleaning and smoothing plastic surfaces, for treating edge areas of furniture panels but also for application to plastic edge bands before, during and / or after fixing the edge bands to panels, in particular furniture panels.

At least one storage vessel is present to receive the surface function coating. Furthermore, a compressed gas source, in particular a compressed air source is provided which can be connected to the respective two-fluid nozzle to promote the surface functional coating liquid according to the principle of a jet pump or an injector nozzle and applied by spraying on the respective surface to be treated.

So that no contaminants get into the storage vessel and thus into the surface functional coating liquid, the necessary connections between the respective two-fluid nozzle and the storage vessel are formed sealed. A provided for pressure equalization on the storage vessel opening has a filter body or a filter cartridge.

This impurities are securely retained, especially from the ambient air.

That in the FIGS. 1 and 2 from the principle construction side shown two-fluid nozzle system is designed as a minimum quantity nozzle valve with a nozzle body 1.

The nozzle body 1 may consist of a metallic material.

The nozzle body 1 is also produced from a plastic material.

The minimum quantity nozzle valve according to the invention has an adjusting device 2 in the nozzle body 1.

The adjusting device comprises a preferably interchangeable needle 3.

The needle 3 has a conical seat tip 4.

The conical seat tip 4 dives into a form-complementary hole 5 in the nozzle body 1 to obtain an annular gap 6 a.

The needle 3 has in the region of the apex 4 a centric, oriented in the needle longitudinal direction first bore 7.

This first bore 7 intersects with a second, in the needle transverse direction oriented bore 8 such that even when the annular gap 6 is closed, a defined over the bore dimensions amount of liquid can be sucked.

In the nozzle body 1, a blind hole 10 is provided for receiving the needle located in a needle holder 9 3. The needle holder 9 is preferably fixed in the blind hole 10 by screwing.

The needle holder 9 has a through hole 11 for guiding the needle 3, wherein the through hole 11 and the needle 3 have complementary threads for needle adjustment. This may in particular be a fine thread.

The blind hole 10 communicates with a guided through the nozzle body 1 first channel 12 in communication, wherein the first channel 12 terminates in an opening 13 for supplying the liquid.

This opening 13 may be a screw connection known per se.

The annular gap 6 merges into a second channel 14, which leads to a third channel 15, to which the compressed gas source can be connected by means of a connection 16.

The third channel 15, but also a binary mixture channel 17, is realized by introducing a bore in the nozzle body.

It is very advantageous here to resort to a stainless steel material. To design such a stainless steel material on the execution of a hole with a geometrically precisely defined channel, is time-consuming and requires high-precision tools.

According to a further basic concept of the invention, at least the channel 15, but in particular also the channel 17, is realized by a pressed-in and / or glued-in sleeve 150 inserted into a larger-caliber bore in the nozzle body 1.

On the possible insertion of different sleeves can be made an individual vote of the two-fluid nozzle depending on the application, to be sprayed medium or even with regard to the order amount per unit time.

At the intersection of the second channel 14 with the third channel 15, the two-substance mixture channel 17 connects, which opens into a nozzle opening 18 of the nozzle body 1.

The needle 3 has at its opposite end of the conical seat tip 4 an adjustment, this adjustment can be formed, for example, as a knurled wheel 19.

A cap 20 similar to a union nut accommodates the sealing of the needle 3 with respect to the nozzle body 1 and the needle holder 9, respectively.

Here can be used recourse to known sealing means, for example in the form of an O-ring 21, with the sealing effect similar to a stuffing box.

The needle 3 may further include marks 22 for reproducible needle adjustment.

The system for applying temporary-acting surface functional coatings by means of spraying according to the second embodiment of the invention is described with reference to FIG Fig. 3 and 4 explained below.

It should be noted that the basic structure of the nozzle body is formed with channels together with compressed gas and liquid supply analogous to the first embodiment.

It is therefore also a nozzle body 1 is present, which may for example consist of light metal, in particular an aluminum alloy.

In contrast to the first embodiment, however, an adjusting device 30 is present, which now no interchangeable needle, but a Schraubeinsatzstück 31 includes.

The Schraubeinsatzstück 31 can be executed for example as a grub screw.

The threaded insert 31 includes a central longitudinally oriented first bore 70 that intersects with a second, laterally oriented bore 80.

The openings of the bore 80 are in particular in the Figure 3 recognizable.

It should be noted at this point that the central, longitudinally oriented first bore 70 (see dashed line in FIG Fig. 3 and 4 ) extends only to the region of the transverse oriented bore, that is not passed through the entire Schraubeinsatzstück 31 therethrough.

Like from the Fig. 3 and 4 it can be seen, in the nozzle body 1 for receiving the Schraubeinsatzstückes 31 as in the first embodiment, a blind hole 10 is present. The Schraubeinsatzstück 31 has over part of its longitudinal extent an external thread which is complementary to an internal thread in the blind hole 10.

The pointing into the blind hole 10 end of the Schraubeinsatzstückes 31 has a longitudinal portion 81 a diameter reduction, that is, in the section 81, the diameter is detached and thread-free. This leaves between the wall of the blind hole 1 and the shell in section 81, a corresponding gap for liquid inlet with respect to an opening 13 for supplying the liquid (in the Fig. 3 and 4 not shown, but basically similar to Fig. 2 according to the first embodiment).

In the bottom of the blind hole 1, a preferably conical recess 6 is introduced, which merges into the channel 14, which leads to the channel 15 to which the compressed gas source (not shown) can be connected.

At the intersection of the channels 14 and 15, similar to the first embodiment, a two-substance mixture channel 17 connects, which opens into the nozzle opening.

Nozzle opening side is still a replaceable union nut 32 (see Fig. 4 ) to a corresponding threaded end 33 ( Fig. 3 ) screwed.

The union nut 32 serves to receive a jet-forming diaphragm 34 and concentrically in front of the nozzle opening 18 (see Fig. 3 ) to place.

With the help of in the Fig. 4 shown exemplary jet-shaping diaphragm 34 manages to produce a very laminar, non-diverging liquid jet, which extends to a distance range of 5-10 cm, calculated from the exit point on the nozzle body.

The sectional view through a further embodiment of the pneumatic two-fluid nozzle used in the system according to the invention Fig. 5 goes in turn from a nozzle body 1 and the other means, as according to Fig. 1 described, out.

In contrast to the nozzle training after Fig. 1 At the lower end of the needle 3, a conical seat tip 4 made of a plastic material is used. Instead of a plastic material, this may also be an insert made of a ceramic material or the like.

It can thus be reacted on the material side on the erosion effects arising in the region of the maximum flow in the annular gap 6, without all the other components of the needle 3 being made of a special material. If wear occurs in the area of the conical seat tip 4, the needle can be removed and a new conical seat tip inserted into a corresponding blind hole at the bottom of the needle, pressed and / or glued.

Claims (19)

1. A system for applying temporarily acting functional surface coatings by spraying through one or more pneumatic two-substance nozzles having a nozzle body (1), which is in connection with at least one reservoir, wherein the reservoir is filled or can be filled with sprayable functional surface coating fluid, and furthermore having a source of compressed gas, in particular compressed air, which can be connected to the respective two-substance nozzle in order to convey the functional surface coating fluid according to the principle of a jet pump or injector nozzle and to apply it onto a surface to be treated by spraying, characterized in that
   the connection between the respective two-substance nozzle and the reservoir is formed to be sealed, and an opening provided on the reservoir for pressure compensation exhibits a filter body or a filter insert,
   the respective two-substance nozzle is realized as a minimum amount nozzle valve having an actuator device (2) in the nozzle body (1), wherein the actuator device (2) comprises an exchangeable needle (3) having a conical seat tip (4), and the conical seat tip (4) moves into a as to the form complementary bore (5) in the nozzle body (1) while obtaining an annular gap, the needle (3) in the area of the conical seat tip (4) has a centric first bore (7) oriented in the longitudinal direction of the needle, which bore intersects a second bore (8) oriented in the transverse direction of the needle such that, even when the annular gap (6) is closed, an amount of fluid defined by the bore dimensions can be extracted.
2. The system according to claim 1,
   characterized in that
   the nozzle body (1) exhibits a blind hole (10) for receiving the needle (3) situated in a needle holder (9), wherein the needle holder (9) can be screwed into the blind hole (10).
3. The system according to claim 2,
   characterized in that
   the needle holder (9) has a passage opening (11) for guiding the needle (3), wherein the passage opening (11) and the needle (3) exhibit a complementary thread for needle adjustment.
4. The system according to claim 2 or 3,
   characterized in that
   the blind hole (10) is in connection with a first duct (12) extending through the nozzle body (1), wherein the first duct (12) terminates in an opening (13) for supplying the fluid.
5. The system according to anyone of the preceding claims,
   characterized in that
   the annular gap (6) merges into a second duct (14) which leads to a third duct (15) to which the source of compressed gas can be connected.
6. The system according to claim 5,
   characterized in that
   a two-substance mixture duct (17) follows at the intersection of the second and third ducts (14; 15) and opens into a nozzle opening (18) of the nozzle body (1).
7. The system according to anyone of the preceding claims,
   characterized in that
   the pressure compensation opening including the filter body is situated in a closure or screw cap of the reservoir.
8. The system according to anyone of the preceding claims,
   characterized in that
   the supplied amount of compressed gas can be set.
9. The system according to anyone of the preceding claims,
   characterized in that
   the needle (3) exhibits a setting aid at its end opposite the conical seat tip (4).
10. The system according to claim 9,
    characterized in that
    the setting aid is formed as a knurled wheel (19).
11. The system according to claim 9 or 10,
    characterized in that
    markings (22) for reproducible needle setting are provided on or can be mounted to the needle (3).
12. A system for applying temporarily acting functional surface coatings by spraying through one or more pneumatic two-substance nozzles having a nozzle body (1), which is in connection with at least one reservoir, wherein the reservoir is filled or can be filled with sprayable functional surface coating fluid, and furthermore having a source of compressed gas, in particular compressed air, which can be connected to the respective two-substance nozzle in order to convey the functional surface coating fluid according to the principle of a jet pump or injector nozzle and to apply it onto a surface to be treated by spraying, characterized in that
    the connection between the respective two-substance nozzle and the reservoir is formed to be sealed, and an opening provided on the reservoir for pressure compensation exhibits a filter body or a filter insert,
    the respective two-substance nozzle is realized as a minimum amount nozzle valve having a setting device (30) in the nozzle body (1), wherein the setting device (30) comprises an exchangeable screw insert piece (31) which has a centric first bore (70) oriented in the longitudinal direction, which bore intersects a second bore (80) oriented in the transverse direction such that an amount of fluid defined by the bore dimensions can be extracted, wherein the nozzle body (1) exhibits a blind hole (10) for receiving the screw insert piece (31), and the screw insert piece (31) can be screwed into the blind hole (10) provided with an internal thread.
13. The system according to claim 12,
    characterized in that
    the screw insert piece (31) is formed as a grub screw, wherein the end pointing into the blind hole (10) has a stepped diameter free from threads.
14. The system according to claim 12 or 13,
    characterized in that
    the blind hole (10) is in connection with a first duct (12) extending through the nozzle body (1), wherein the first duct (12) terminates in an opening (13) for supplying the fluid.
15. The system according to anyone of claims 12 to 14,
    characterized in that
    a recess (86) is provided in the bottom of the blind hole (10), which recess merges into a second duct (14) which leads to a third duct (15) to which the source of compressed gas can be connected.
16. The system according to claim 15,
    characterized in that
    a two-substance mixture duct (17) follows at the intersection of the second and third ducts (14; 15) and opens into a nozzle opening (18) of the nozzle body (1).
17. The system according to anyone of the preceding claims,
    characterized in that
    on the side of the nozzle opening, a union nut (32) is provided which receives an exchangeable, jet-shaping cover (34).
18. The system according to anyone of the preceding claims,
    characterized in that
    the system can be used in edge coating of furniture boards.
19. The system according to claim 5 or 15,
    characterized in that
    at least the third duct is formed by a sheath which is adaptable to the case of application, wherein the sheath is inserted, in particular pressed in and/or glued in a respective bore of the nozzle body (1).

Images