DE102007028096B3 - Device for applying a coating agent to a substrate - Google Patents

Abstract

It is a device for applying a liquid coating agent on successively transported substrates, in particular a lubricant to thermoforming materials, proposed with at least one above and / or below a transport plane arranged for the substrates, the transport plane open spray chamber (1a, 1b). In the spray chamber (1a, 1b) at least one row of juxtaposed spray valves (8) are provided, which are supported on a spray valve carrier (10) passing through the spray chamber (1a, 1b) and can be supplied at least with application means and those for controlling the application process Control valves (13) are assigned. The transport plane are assigned to successive conveying elements (22) for transporting the substrates. At the entrance (2) and exit (3) of each spray chamber (1a, 1b) open suction channels (17) are provided for the transport plane. The mutually facing ends of successive conveying members (22) each face an adjacent wall of a spray chamber (1a, 1b) which has a narrow, the spray valves (8) associated between the successive conveyor members (22) engaging the front region (25) and having an opposite, rearward area. The rear region is assigned to the spray valve carrier (10), on which the spray valves (8) are supported by the distance bridging, elongated holder (9).

Description

The The invention relates to a device for applying a liquid applicator on successively transported thermoforming materials, with at least one above and / or below a transport plane for the substrates arranged, open to the transport plane spray chamber, in each case at least a series of juxtaposed spray valves is provided which at one the spray chamber supported by spraying valve carrier and at least with order means are supplied and those to the control the order process control valves are assigned, the transport level successive conveying organs for Transporting the substrates are assigned and being at the entrance and exit of each spray chamber to the transport plane open suction channels are provided.

such Known devices are devices in industrial plants, with which, for example, on a surface of a workpiece, in particular a thermoforming board, an oil film or a layer of adjacent oil droplets is applied. On this way, the "slip" between the stamp, set the drawing ring and the downholder of a deep drawing press become. In the process, the oil film is applied to the transported substrate electronically controlled spray valves used with which the order quantity per area or the desired order geometry can be set exactly. Because a faulty thickness of the applied oil film can negatively affect the press result. This can cause wrinkling or to optical quality defects at Produce finished product.

at a known device of the type mentioned above is one each spray chamber with spray valves arranged above and below a transport plane. The spray valves are each on a spray valve holder supported, whereby these are supplied with application agent and air. The transport level are conveying organs in the form of deflected conveyor belts for Assigned transport of the substrates. These conveyor belts are partially within the spray chamber arranged.

The spray chambers are in the area of transport front and rear side walls with suction channels Mistake. This should be a spray outlet from the spray chambers be avoided.

The Arrangement of the conveying organs with their ribbons inside the spray chambers However, it is particularly disadvantageous, since this is a large amount on spray mist sit down on the conveyor belts can and therefore the conveyor belts in Return area from the oil need to be cleaned.

To make such a cleaning can, for example, in the DE 20 2006 008 506 U1 provided in the return region of the conveyor belt, a scraper, with which the adhering to the conveyor belt oil can be stripped, so that a drop formation on the substrate is avoided. However, this is very expensive and expensive.

Further, the DE 1 796 280 A a device for applying adhesive to veneer lumber, which has above and below the transport plane arranged spray chambers. In the transport plane, pressure devices in the form of pressure rollers and disk rollers for receiving and advancing the veneer woods are arranged at the entrance and exit area of two spray chambers located opposite one another by the distance between the two spray chambers. The spray chambers also each have a narrow tapered front portion, the pressure and disc rollers outside the spray chambers are associated with the narrow tapered areas. The veneer lumbers are sprayed with the adhesive by means of spray heads. The spray heads are directly connected via hoses to an adhesive manifold, an atomizing air manifold and a pilot air manifold. The veneer lumbers are fixed upon exiting the spray chambers by teeth of the pulley wheels, so that the teeth engage the outer surfaces of the veneer lumbers. However, this is disadvantageous in terms of thermoforming materials, as this would significantly damage the surfaces and degrade the quality of the final product.

Therefore It is the object of the present invention to provide a device according to the preamble of Claim 1 to improve that a simple and inexpensive construction is achieved, within the spray chambers running means of transport for Avoid substrates and already sprayed with application agent surfaces of Substrates not adversely affected become.

According to the invention, this object is achieved in that the mutually facing ends of successive conveyors designed as conveyor belts each face an adjacent wall of a spray chamber, which has a narrow, the spray valves associated, engaging between the successive conveyor members front area and the opposite, rearward Area which is associated with the Sprühventilträger to which the spray valves are supported by the distance bridging, elongated holder, wherein the deflection of the conveying members an associated, narrowed Area is adjacent and the conveying members are formed with in an associated, engaging by a constriction of the adjacent spray chamber housing stage deflecting.

Due to the small width of the front region of the spray chamber, the conveying elements of the device according to the invention can advantageously be moved to the outside of the spray chambers, thereby ensuring that adhesion of the application agent, in particular oil, to the conveyor belt when spraying the substrates by means of the spray valves is completely prevented. In this way, a necessary cleaning of the conveyor belt, as in previously known devices avoided. Therefore, additionally necessary cleaning equipment, such as the scraper of DE 20 2006 008 506 U1 no longer necessary, resulting in cost savings and higher quality of finished products. In addition, this facilitates the prevention of undesirable spillage of spray from the spray chambers. Another advantage is to be seen in the increase in freedom from interference and transport accuracy. By eliminating transport means, such as belts or rollers, in the spray chamber, the number of transfers of the transported substrates is reduced from one conveyor to the next. This also reduces the risk at each transition from one conveyor to the next existing danger that the substrates can rotate, for. As a result of an incorrectly set flow height of cut edges and Umkantungen on the substrates or by not 100% synchronization of transport speeds.

By the deflection of the invention conveyors can designed as conveyor belts conveyors be arranged very close to the entrance and exit of the spray chamber, so that the substrates are mainly after the spraying process no negative influences, z. B. tilting suspended become. In particular thermoforming materials with high accuracy sprayed and have to be transported so that later Pressing a high quality has, are the conveying organs provided in the form of conveyor belts, which enable safe transport.

In An advantageous embodiment of the invention can be provided be that respect the transport plane opposite spray chambers are provided, of which at least one a narrow front Has area. It is perfectly sufficient if one of the two spray chambers has a narrow front area. This narrow front Area can advantageously conveyor members be assigned, which, depending on which of the two spray chambers has the narrow front area, above or below the transport plane are arranged.

Farther may be advantageous if the narrow front areas forming Constrictions of opposing ones spray chambers are offset in the transport direction against each other. In this way Is it possible, successive conveying organs for the Substrates on different sides of the transport plane to each other staggered so that, for example, before applying the liquid coating agent inlet side, the substrates on the inlet side conveyor belt rest and after application of the applicator on the outlet side of the Hanging substrates be transported, for example, they are magnetically attached to the outlet side conveyor belt are kept. This outlet side magnetic recording of the substrates, for example, for subsequent Process steps be beneficial.

Around an escape of spray over the Entrance area and exit area of each spray chamber and in particular a cooling down of the application agent by sucked in outside air during aspiration within the spray chamber To prevent the inlet and outlet side suction channels are provided. To form the suction channels can the front and rear boundary of each spray chamber double-walled be. Instead of double-walled boundaries could of course also two parallel single-walled limitations may be provided. This will be in everyone Case suction channels formed over the Air from outside is sucked in, which forms a barrier for outwardly penetrating spray, so that does not go outside can penetrate. Furthermore is by sucking outside the spray area the so-called spray jet or spray cone which does not affect the order quantity of application means during the spraying not unintentionally changed negatively becomes.

Further advantageous embodiments of the invention will become apparent from the other dependent claims.

there the above and the following may be added explanatory Features of the invention not only as specified in the claims Combination, but also in other combinations use, without to leave the scope of the invention.

below The invention will be described with reference to embodiments with reference closer to the drawing explained.

It demonstrate:

1 a transverse cross section through the inventive device for applying a coating agent on substrates;

2 a partial view of in 1 illustrated apparatus for applying the applicator to the substrates; and

3 a schematic representation of another possibility of the embodiment of in 1 shown device.

In 1 is an apparatus for applying a liquid coating agent on substrates, in particular a lubricant, such as oil, on thermoforming plates, shown in cross section, wherein the device comprises two opposing spray chambers 1a and 1b contains a passageway gap with an inlet gap 2 and an outlet gap 3 limit. Through this column 2 and 3 For example, the substrates to be oiled (not shown) can pass through.

As can be clearly seen here are two opposing spray chambers 1 provided, namely seen from the transport plane upper spray chamber 1a and a lower spray chamber seen from the transport plane 1b , Both spray chambers 1a and 1b have a housing 4 on. The housing 4 the spray chambers 1a and 1b owns a frame 16 to which the outer walls are attached. At the upper spray chamber 1a is at least one sidewall 5 of the housing 4 designed as an openable flap by a locking element 6 is lockable. This allows the spray chamber 1a to monitor or replace the in the spray chamber 1a be opened elements. A similar flap is also in the area of the lower spray chamber 1b provided as by a provided at the lower edge hinge 6b is indicated. The lower end of the lower spray chamber 1b is through a drip pan 7 formed, which is suitably fixed.

In detail, each spray chamber 1a and 1b for wetting the substrates with the application means at least one spray valve 8th , in particular an arrangement of several spray valves 8th , wherein, since the device is shown in cross-section, in the spray chambers 1a and 1b only one spray valve at a time 8th is visible. The spray valves 8th are about holders 9 on a spray valve carrier 10 attached, which via a holding device, not shown 11 in the associated spray chamber 1a and 1b is included. The holders 9 are in one of the spray chambers, namely in the lower spray chamber 1b , opposite the height of the spray valves 8th extended trained. However, it is of course also possible that both spray chambers 1a and 1b or just the upper spray chamber 1a on extended holders 9 recorded spray valves 8th having.

This spray valve carrier 10 indicates distribution lines which can be acted upon with air and coating agent 12 on, with which the individual spray valves 8th over in the respectively assigned holders 9 provided, not shown channels communicate. The holders 9 are provided to form the channels with holes, not shown. These are over on the spray valve carrier 10 remote side mounted control valves 13 designed controllable, so that the air and Auftragmittelzufuhr can be controlled according to predetermined conditions. Between the distribution lines 12 for the spray air and the application agent is also a distribution line 12a for the control air for controlling the spray valves 8th by means of the control valves 13 intended. The control valves 13 In addition to pneumatic operation, they can also be operated hydraulically or magnetically. Alternatively to the medium supply to the spray valves 8th over the spray valve carrier 10 could be the medium supply to the spray valves 8th also via hoses.

They are also in the area of the spray valve carrier 10 heaters 14 provided, by means of which the oil or the application agent is heated. The heaters 14 are there with the respective in the Sprühventilträgern 10 distribution lines provided for the application medium 12 connected. Advantageously, the spray valves 8th the next allocated distribution line 12 for passing the application agent to the spray valves 8th intended.

Furthermore, both spray chambers 1a and 1b in the rear of the transport plane remote area a closure element 15 on top of that, the spray chambers 1a and 1b closes to the outside. The closure element 15 is special in the lower spray chamber 1b designed as a tub.

In the area of the inlet gap 2 and the outlet gap 3 every spray chamber 1a and 1b are open to the transport plane suction channels 17 intended. These are the front and rear boundaries of each spray chamber 1a and 1b double-walled design. The suction channels 17 suck in outside air, which prevents the escape of spray mist. As a result, the spray can not reach oiled substrates, whereby the quality of the oil film on the substrates is not adversely affected. In addition, the peripheral suction of a barrier forming outside air makes an extraction of the spray chambers 1a and 1b dispensable inside, eliminating the outside air from the inside of the spray chambers 1a and 1b is kept away, so that the temperature of the oil in the spray cone is not lowered by the suction air. Compared to the direct inner Aspiration of the spray is not adversely affected by a peripheral suction, the amount of oil and spray air. The indicated with arrows connection of the suction channels 17 to a suction device takes place in the rear region of the spray chambers 1a and 1b , For this purpose, the suction channels 17 connected to a rear suction channel, which leads via a filter system to a suction fan, not shown. Should be in the lower spray chamber 1b the spray in the inner space, for example in the region of the Sprühventilträgers 10 , Settle, so this spray can by means of the closure element designed as a trough 15 be caught. Each on the outsides of the side walls of the housing 4 the lower spray chamber 1b are gutters 18 provided for receiving on the side walls possibly down running order means.

The upper spray chamber 1a points in the rear area near the closure element 15 a height adjustment device 19 on, by means of the arrangement of Sprühventilträger 10 , Spray valves 8th , Control valves 13 and heating device 14 in their height in the upper spray chamber 1a according to the substrates and the associated spraying this can be adjusted. In the lower spray chamber 1b is also a height adjustment provided by a slot 20 is hinted that extends into the rear closure element 15 extends. Furthermore, the upper spray chamber 1a below the spray valves 8th , from these laterally towards the side walls of the housing 4 running splash plates 21 on top of the elements in the rear area of the upper spray chamber 1a protect against the spray of the coating agent to prevent contamination and malfunction of these elements. Of course, also the lower spray chamber 1b in the field of spray valves 8th Such splash plates 21 to protect against penetrating into the rear area spray. In the example shown, however, the lower spray chamber 1b no such splash plates 21 on.

Furthermore, the device of the transport plane associated, successive conveying members 22 on. These are designed here as conveyor belts, which have Umlenk- or drive rollers guided around circulation organs on which the substrates are transported on the upper side resting. The conveying organs 22 are designed here as suction belts, a suction device 23 have that with vacuum chambers 24 is provided. The circulatory organs are provided with openings and are thus formed as a perforated bands, which via the vacuum chambers 24 are guided. In this way, the resting on the circulating organs substrates are sucked through the openings to the circulation organs, whereby slippage of the substrates is prevented during transport to the circulation organs. Of course, magnetic tapes or simple standard or standard tapes can be used instead of suction tapes.

In 1 are the conveying organs 22 arranged below the transport plane, which in each case the side walls of the lower spray chamber 1b flank. Another way of arranging the conveying organs 22 is in 3 shown, which will be discussed later.

In previously known devices conveying organs are also within the spray chambers 1 intended. These conveying elements are thus also sprayed when spraying the substrates. In order to avoid such contamination of the conveying or circulating organs and thus to be able to exclude additional work steps or cleaning elements, at least one of the two spray chambers 1a and or 1b with a narrow front area associated with the transport plane 25 educated. This allows the conveying organs 22 to the outside of the adjacent spray chamber 1 , in 1 the spray chamber 1b , are laid so that the circulation organs are protected from contamination. There are now each inlet side before the spray chamber 1b and downstream of the spray chamber 1b each conveying organs 22 arranged with a rotating member in the transport plane, whereby the successive conveying members 22 with their ends facing each other the narrow front area 25 the lower spray chamber 1b flank. The narrow front area 25 the spray chamber 1b thus engages between the successive conveying organs 22 on the other hand, in contrast, the rear area of the lower spray chamber 1b is extended. This narrow front area 25 can be designed so that this to the spray valves 8th adapted in its geometry.

It is of course also possible that both spray chambers 1a and 1b as in the following 3 shown a narrow front area 25 exhibit. But it is also conceivable that only the upper spray chamber 1a has a narrow front area. The narrow front area 25 the spray chamber 1b can advantageously be centrally between the conveying organs 22 be arranged, with a slightly eccentric arrangement is also possible. In addition, the conveying organs 22 be formed with a respectively associated, narrowed housing portion of adjacent deflection, in particular with an associated, by a constriction of the adjacent spray chamber 1b formed housing level 26 of the housing 4 the spray chamber 1b engaging diversion, as out 1 seen.

The narrow front area 25 the lower one spray chamber 1b has at its front end towards the transport plane towards a funnel-shaped extension. Because the front area 25 the lower spray chamber 1b is formed very narrow, thereby the spray cone is not affected during suction, ie an undesirable suction in the spray cone is prevented by the funnel shape. Into the funnel-shaped extension of the front area 25 is a trained from sliding rods pad 27 introduced, which is intended to prevent entanglement or displacement of the substrates during transport through the passage gap. In the middle part of the narrow front area 25 is the arrangement of the spray valves 8th added. The individual spray valves 8th are, as already mentioned, on the extended holders 9 appropriate. The narrow area 25 can in its geometry according to the design of the spray valves 8th in connection with the holders 9 be designed. Unlike the upper spray chamber 1a show the individual holders 9 in the lower spray chamber 1b a longer length to allow the spray valves 8th with the spray valve carrier arranged in the extended area 10 and the control valves 13 can be in communication and thus an application of the application agent is made possible on the substrates.

To a laminar flow of the suction air in conjunction with the spray without turbulence when sucking into the suction channels 17 to achieve are in at least one spray chamber 1a respectively. 1b , preferably the constriction-free upper spray chamber 1a , additional baffles 211 provided in the area of the inputs of the inlet slit 2 and the outlet gap 3 associated suction channels 17 are arranged. The baffles 211 are each outside the case 4 and inside the spray chamber 1a on a profile for the formation of the suction channels 17 appropriate. It is advantageously provided that in the region of the inlet gap 2 outside on the housing 4 attached baffle 211 compared to the baffle 211 in the area of the outlet gap 3 has a greater width, so that easier guidance of the substrates on the conveying member 22 is reached. Inside the spray chamber 1a on the other hand has the baffle 211 in the area of the outlet gap 3 a larger width, which in addition to the flow rate, the transport speed is taken into account. In addition, in the region of the input far end of the suction channels 17 at least one spray chamber 1a respectively. 1b , in this embodiment, only in the upper spray chamber 1a , Baffles 212 intended. These baffles 212 are in the area of the closure element 15 in the upper spray chamber 1a in each case on the profiles for the formation of the suction channels 17 attached, with the baffles 212 with their ends in the direction of the Sprühkammermitte out to reach there a laminar flow. It is of course possible that the lower spray chamber 1b baffles 211 and 212 having. Through the baffles 211 and 212 The suction power can be reduced without the spray can escape to the outside.

The individual substrates are sprayed with the coating agent over the inlet gap 2 introduced and through the passage gap between the two opposite spray chambers 1a and 1b carried out while the top side by the arrangement of the spray valves 8th in the upper spray chamber 1a and underside by the arrangement of the spray valves 8th in the lower spray chamber 1b sprayed with oil as a coating agent. After spraying or wetting the substrates, they are passed over the outlet gap 3 from the field of spray chambers 1 led out to be transported to other processing facilities, for example, for cutting substrate blanks for the production of body parts of a motor vehicle on a deep-drawing press. Due to the position of the oil film on the substrate or its thickness, the flow properties of the substrate between the drawing punch, the drawing ring and the hold-down are adjusted.

2 shows a part of the spray system of the device for applying the liquid application agent on the substrates in front view. As can be seen in this figure, the two spray chambers 1a and 1b with respect to the transport plane of the substrates arranged opposite each other, wherein the spray valves 8th in every spray chamber 1a . 1b advantageously evenly distributed over the width side by side at the across the width of the spray chambers 1a and 1b continuous spray valve carrier 10 are arranged. Also here are the distribution lines 12 for the spray air and for the application agent in the spray valve carrier 10 clearly visible. As already mentioned, in the area of the spray valve carrier 10 the heater 14 arranged, which is also like the Sprühventilträger 10 each across the width of the spray chambers 1a and 1b extends.

3 shows a further embodiment of the structure of the device, wherein the device is shown only schematically and partially in the transport plane. As can be seen, the front areas are 25 the upper and the lower spray chamber 1a and 1b formed narrow, wherein the inlet side, a conveying member 22 the adjacent side wall of the lower spray chamber 1b and on the outlet side a conveying member 22 the adjacent side wall of the upper spray chamber 1a assigned. The two spray chambers 1a and 1b therefore point only on one side, either in the area of the inlet gap 2 or in the area of the outlet gap 3 , a feeder or a housing stage 26 on, which also has a narrow front area 25 is formed. The inlet side is a conveying member 22 arranged below the transport plane and the outlet side a conveying member 22 arranged above the transport plane. As can be seen, thus the two conveying organs 22 offset from each other in the transport plane arranged. Both conveying organs 22 in doing so, access the respective assigned housing level 26 the spray chamber 1a respectively. 1b one.

The narrow front areas 25 the spray chambers 1a and 1b are arranged opposite each other. Again, as in 1 , the narrow front areas 25 the spray chambers 1a and 1b funnel-shaped to be through the induced draft in the suction channels 17 Do not negatively influence the spray cone.

This embodiment of the device is advantageous if the substrates, here designated S, rest before application of the applicator on the revolving member and after spraying with the application means, for example by means of magnetic holders hanging to other processing facilities must be transported because they require special brackets , Also in this way is an arranging the conveying organs 22 inside the spray chambers 1a and 1b avoided, thereby preventing a return of sprayed on the circulating organ application agent and thus does not affect the quality of the substrates or is significantly increased.

Of course they are Deviations from the illustrated embodiments possible without the To leave the basic idea of the invention.

Claims (21)

Apparatus for applying a liquid coating agent on successively transported thermoforming materials, with at least one above and / or below a transport plane arranged for the substrates, to the transport plane open spray chamber ( 1a . 1b ), in each case at least one row of juxtaposed spray valves ( 8th ) provided at one of the spray chamber ( 1a . 1b ) passing through the spray valve carrier ( 10 ) and are at least supplyable with order means and to control the order process control valves ( 13 ), wherein the transport plane successive conveying organs ( 22 ) are assigned to transport the substrates and wherein at the entrance ( 2 ) and output ( 3 ) of each spray chamber ( 1a . 1b ) to the transport plane open suction channels ( 17 ) are provided, characterized in that the mutually facing ends of successive conveyor belts designed as conveyor belts ( 22 ) in each case an adjacent wall of a spray chamber ( 1a . 1b ), which have a narrow, the spray valves ( 8th ), between the successive conveying organs ( 22 ) engaging front area ( 25 ) and an opposite, extended rear portion of the spray valve carrier ( 10 ) to which the spray valves ( 8th ) by the distance bridging, elongated holder ( 9 ) are supported, wherein the deflection of the conveying organs ( 22 ) is adjacent to an associated, narrowed area and the conveying organs ( 22 ) with an associated, by a constriction of the adjacent spray chamber ( 1a . 1b ) formed casing stage ( 26 ) engaging deflection are formed. Apparatus according to claim 1, characterized in that with respect to the transport plane opposing spray chambers ( 1a . 1b ), at least one of which has a narrow front area ( 25 ) having. Apparatus according to claim 1, characterized in that the successive conveying members ( 22 ) with their mutually facing ends the narrow front area ( 25 ) of the same spray chamber ( 1b flank. Device according to one of the preceding claims, characterized in that the narrow front region ( 25 ) is arranged centrally. Device according to claim 2, characterized in that the narrow front areas ( 25 ) forming constrictions of opposing spray chambers ( 1a . 1b ) is offset in the transport direction against each other. Apparatus according to claim 1, characterized in that the spray valve carrier ( 10 ) distribution lines which can be acted upon with air and coating agent ( 12 . 12a ), with which the spray valves ( 8th ) in the respectively assigned holders ( 9 ) communicate channels provided by the control valves ( 13 ) are controllable. Device according to claim 6, characterized in that the control valves ( 13 ) on the spray valve carrier ( 10 ) facing away from the holders ( 9 ) are mounted. Device according to claim 6 or 7, characterized in that the holders ( 9 ) are provided to form the channels with holes. Device according to one of the preceding claims, characterized in that the spray valve carrier ( 10 ) adjustable in height in the associated spray chamber ( 1a . 1b ) is arranged. Device according to one of the preceding claims, characterized in that the front and rear boundaries of each spray chamber ( 1a . 1b ) for forming the suction channels ( 17 ) are double-walled. Device according to one of the preceding claims, characterized in that in the region of the spray valve carrier ( 10 ) a heating device ( 14 ) is provided. Device according to one of the preceding claims, characterized in that on side walls of a housing ( 4 ) a spray chamber ( 1b ) Gutters ( 18 ) are provided for receiving located on the side walls applicator. Device according to one of the preceding claims, characterized in that a rear closure element ( 15 ) a spray chamber ( 1b ) is designed as a trough for collecting application agent. Device according to one of the preceding claims, characterized in that in the region of the inputs of the inlet gap ( 2 ) and outlet gap ( 3 ) associated suction channels ( 17 ) at least one spray chamber ( 1a . 1b ) Flow baffles ( 211 ) are provided. Apparatus according to claim 14, characterized in that in the region of the inputs of the suction channels ( 17 ) of the narrowing spray chamber ( 1a ) Flow baffles ( 211 ) are provided. Apparatus according to claim 14 or 15, characterized in that outside and inside the spray chamber ( 1a . 1b ) Flow baffles ( 211 ) are provided. Apparatus according to claim 14, 15 or 16, characterized in that a in the region of the inlet gap ( 2 ) on the outside of the housing ( 4 ) of the spray chamber ( 1a ) baffle ( 211 ) has a greater width than one in the region of the outlet gap ( 3 ) on the outside of the housing ( 4 ) of the spray chamber ( 1a ) baffle ( 211 ). Device according to claim 14, 15 or 16, characterized in that one in the region of the outlet gap ( 3 ) within the spray chamber ( 1a ) baffle ( 211 ) has a greater width than one in the region of the inlet gap ( 2 ) within the spray chamber ( 1a ) baffle ( 211 ). Device according to one of the preceding claims, characterized in that in the region of the remote end of the suction channels ( 17 ) at least one spray chamber ( 1a . 1b ) Baffles ( 212 ) are provided. Apparatus according to claim 19, characterized in that in the region of the input far end of the suction channels ( 17 ) of the spray chamber ( 1a ) Baffles ( 212 ) are provided. Device according to claim 19 or 20, characterized in that the baffles ( 212 ) in the region of the closure element ( 15 ) of the respective associated spray chamber ( 1a . 1b ) are provided and extend with their ends in the direction of the Sprühkammermitte out.