DE102013011107A1 - Method for operating a surface treatment system and device for separating overspray - Google Patents

Abstract

In a method for operating a surface treatment system (12), overspray that arises in one or more coating booths (10) is absorbed by an air stream and fed to at least one disposable separation unit (44), in which overspray is separated and which, after reaching a Limit loading with overspray as a loaded disposable separation unit (64) is exchanged for an empty disposable separation unit (44). A filter aid material is fed to the air stream in a feed area (70) upstream of the at least one disposable separation unit (44) and / or the interior (48) of the at least one disposable separation unit (44). A device for separating overspray is also specified. Booth air laden with overspray can be passed through at least one disposable separation unit (44) in which overspray is separated. The disposable separation unit (44) is designed as an exchangeable structural unit with an interior space (48) in which a filter unit (50) is accommodated. The air flow loaded with overspray can be guided to the disposable separation unit (44) via an air guide device (42). An auxiliary filter device (68) is provided, by means of which an auxiliary filter material can be supplied to the air flow in a supply area (70) upstream of the at least one disposable separation unit (44) and / or the interior (48) of the at least one disposable separation unit (44) .

Description

The invention relates to a method for operating a surface treatment system, in which overspray, which results in one or more coating booths, is taken up by an air flow and guided to at least one disposable separation unit, in which overspray is deposited and which after reaching a limit loading with overspray loaded disposable separation unit is exchanged for an empty disposable separation unit.

• a) wenigstens einer Einweg-Abscheideeinheit, durch welche mit Overspray beladene Kabinenluft leitbar ist und in welcher sich Overspray abscheidet; wobei
• b) die Einweg-Abscheideeinheit als austauschbare Baueinheit mit einem Innenraum ausgebildet ist, in dem eine Filtereinheit untergebracht ist;
• c) der mit Overspray beladene Luftstrom über eine Luftleiteinrichtung zu der Einweg-Abscheideeinheit leitbar ist.

In addition, the invention relates to a device for separating overspray from the overspray-laden cabin air of surface treatment plants, in particular paint shops, with

• a) at least one disposable separation unit through which cabin air laden with overspray can be conducted and in which overspray separates; in which
• b) the disposable separation unit is designed as a replaceable unit with an interior, in which a filter unit is housed;
• c) the airflow laden with overspray can be conducted via an air guiding device to the disposable separation unit.

In the case of manual or automatic application of lacquers to objects, a partial flow of the lacquer, which generally contains both solids and / or binders and solvents, is not applied to the article. This partial flow is called "overspray" in the professional world. Furthermore, the terms overspray or overspray particles are always understood to mean a disperse system, such as an emulsion or suspension or a combination thereof. The overspray is detected by the air flow in the paint booth and fed to a separation, so that the air can optionally be returned to the coating booth after a suitable conditioning.

In particular, in systems with a larger paint consumption, for example in systems for painting vehicle bodies, wet separation systems on the one hand or electrostatic dry separators on the other hand are preferably used in a known manner. In known wet scrubbers relatively much energy is required to circulate the required, quite large amounts of water. The treatment of the rinse water is costly due to the high use of paint-binding and detackifying chemicals and the Lackschlammentsorgung. Furthermore, the air absorbs a lot of moisture due to the intensive contact with the rinse water, which in turn results in a high energy consumption for the air treatment in the recirculation mode. In the case of electrostatic dry separators, the paint overspray must be continuously removed from the separation surfaces, which is usually associated with structurally quite complex measures. In addition, the energy consumption of such separators is higher in comparison.

As an alternative to common, stationary wet and dry separation systems, which can also work electrostatically, systems with exchangeable disposable separation units are used, which are replaced after reaching a limit loading with overspray against unloaded separation units and disposed of or recycled if necessary. The treatment and / or disposal of such separation units can be energetically and also with regard to the required resources more compatible than the cost of a wet scrubber or an electrostatic working separation device.

Overspray usually has strong adhesive properties and usually has liquid components. Therefore, it may happen that the disposable separation units are added by separating overspray and stick together, so that such a separation unit can no longer be traversed by cabin air before it has reached its limit loading. In such a case, therefore, the relevant separation unit must be prematurely replaced with respect to the possible operating time and the possible absorption capacity for an unloaded, fresh separation unit.

In addition, the liquid components of the overspray can collect at the bottom of a separation unit, which makes their handling difficult in their disposal or further utilization. In particular, care must then be taken that the separation units are not tilted, since the collected liquid components could otherwise leak out.

It is an object of the invention to provide a method and a device of the type mentioned, which reduce these disadvantages.

This object is achieved by a method of the type mentioned in that
the air stream in a feed region upstream of the at least one disposable separation unit and / or the interior of the at least one disposable separation unit a filter aid material is supplied.

The invention is based on the recognition that by adding a filter aid, which may also be a mixture of substances, a bonding of the separation units and / or an accumulation of liquid in separation units effectively can be prevented, which are designed as disposable units.

The filter aid is preferably particulate or granular and / or has a fibrous or void structure.

The filter aid can be supplied particularly well if it can be atomized or atomized.

In this context, it is advantageous if a powder material is used as filter aid.

Particulate, d. H. Also powdery, filter aid preferably has an average particle diameter of 10 .mu.m to 100 .mu.m.

As a filter aid materials are used in particular for this purpose, which detackify the overspray and / or absorb or bind liquid components of the overspray. Such materials are used as filter aids in the DE 20 2011 107 555 U1 described.

Preferably, these are thus lime, stone powder, in particular limestone powder, aluminum silicates, aluminum oxides, silicon oxides or the like.

Also, materials having cavity structures and thereby having a large inner surface compared to the outer surface of individual particles may be used. Examples of such materials are natural or synthetic zeolites or fiber materials as well as correspondingly constructed polymer or glass materials and aluminum silicates.

With regard to the zeolites, calcium, magnesium, calcium magnesium, sodium and / or potassium zeolites and mixtures of these are suitable.

Environmentally and economically advantageous, the filter aid may be a material obtained from spent disposable separation units. Overspray-loaded disposable separation units are subjected to a treatment treatment for this purpose, which will be discussed in detail below.

The filter aid may also include compounds that chemically bind the overspray solid particles and / or its liquid components. According to the above DE 20 2011 107 555 U1 For this purpose, compounds with amine, epoxide, carboxyl, hydroxyl or isocyanate groups, particles of octylsilane aftertreated alumina or solid or liquid mono-, oligo- or polymers, silanes, silanols or siloxanes can be used.

• d) eine Filterhilfseinrichtung vorhanden ist, mittels welcher
• da) dem Luftstrom in einem Zuführbereich stromauf der wenigstens einen Einweg-Abscheideeinheit und/oder
• db) dem Innenraum der wenigstens einen Einweg-Abscheideeinheit

ein Filterhilfsmaterial zuführbar ist.In a device of the type mentioned above, the above object is achieved with the same advantages in that

• d) a filter auxiliary device is present, by means of which
• da) the air flow in a feed region upstream of the at least one disposable separation unit and / or
• db) the interior of the at least one disposable separation unit

a filter aid material can be supplied.

It is advantageous if the filter aid device comprises nozzles, via which atomizable or nebulizable filter aid material can be supplied to the feed region and / or the interior of the at least one disposable separation unit.

Alternatively or additionally, in particular with other filter aids, it is expedient for the filter aid to comprise one or more conveying units, in particular screw conveyors, by means of which particulate or granular filter auxiliary material can be supplied to the feed region and / or the interior of the at least one disposable separation unit.

Embodiments of the invention will be explained in more detail with reference to the drawings. In these show:

1 a first embodiment of a Lackierkabine with a separator for overspray in a front view in which the overspray laden cabin air is supplied on its flow path to disposable filter modules by means of a filter aid means a filter aid material;

2 a second embodiment of a paint booth in a modification of the paint booth of 1 wherein an exchange of disposable filter modules is done manually;

3 a third embodiment of a paint booth in a modification of the paint booth of 2 wherein an exchange of disposable filter modules is automated;

4 a fourth embodiment of a paint booth in a further modification of the paint booth of 2 showing only a lower plant area with two further variants to supply a filter aid material;

5 schematically different treatment stations in a treatment plant in which loaded disposable filter modules can be subjected to a treatment, which support their utilization.

In 1 is with 10 a total of a coating booth a surface treatment plant 12 denotes in which objects 14 to be painted. As an example of objects to be painted 14 are vehicle bodies 16 shown. Before this to such a coating booth 10 For example, they were cleaned and degreased in pre-treatment stations not specifically shown.

After that, the vehicle bodies 16 in successive coating stations 18 . 20 and 22 provided with a primer, a basecoat and a topcoat, as it is in itself known; such coating stations 18 . 20 and 22 are exemplary in the 1 . 2 respectively. 3 characterized. In each of these coating stations 18 . 20 . 22 is a coating booth 10 arranged in which the respective coating material on the vehicle body 16 is applied, wherein in the 2 and 3 modified coating cabins 10 ' and 10 '' are shown.

In every coating booth 10 the different treatment stations 18 . 20 and 22 arise different types of overspray, ie in general terms includes the surface treatment plant 12 several coating booths 10 in which different types of overspray arise.

The coating booth 10 has a top coating tunnel 24 with a blanket 26 , which in the usual way as the lower boundary of an air supply space 28 with filter cover 30 is trained.

The vehicle bodies 16 be with a in the coating tunnel 24 accommodated and in itself known conveyor system 32 from the input side of the coating tunnel 24 transported to its output side. Inside the coating tunnel 24 are application facilities 34 in the form of multi-axis application robots 36 as they are known in and of themselves. By means of the application robot 36 can the vehicle bodies 16 be coated with the appropriate coating material.

At the bottom is the coating tunnel 24 via a walk-in grate 38 to a plant area arranged underneath 40 open in which are separated from the cabin air Überspraypartikel separated from the cabin air.

From the air supply room 28 During the coating process air flows down through the coating tunnel 24 through to the plant area 40 , where the air in the coating tunnel 24 absorbs existing paint overspray and carries with it.

This overspray-laden air is supplied by a louver 42 to several disposable separation units 44 passed, which in the present embodiment in the form of disposable filter modules 46 are formed. These are in the longitudinal direction of the coating booth 10 arranged one behind the other, which is why in 1 only such a filter module 46 you can see. Below is on filter modules 46 Reference is made, the comments apply mutatis mutandis to disposable separation units 44 in general, which is also different than the filter modules shown 46 can be trained.

Each filter module 46 may be formed in a manner known per se, for example, as a separation filter or as an inertia filter or else as a combination thereof.

The louver 42 includes air baffles 42a that at least partially limit the flow path of the cabin air and this to the filter modules 46 to lead. In operation is every filter module 46 Fluidic and detachable with the louver 42 connected. The cabin air flows through in the filter module 46 an interior 48 and a filter unit housed there 50 at which the paint overspray deposits in particular. The filter unit 50 is only with the filter module 46 in the 1 and 4 to recognize, in which the interior 48 is visible. Overall, each disposable separation unit 44 designed as a replaceable unit.

The cabin air, which is now largely freed from overspray particles, flows out of the filter module 46 in an intermediate channel 52 through which they enter a collection flow channel 54 arrives. The cabin air is via the collecting flow channel 54 fed to a further conditioning and conditioning and then in a not shown here specifically circuit back into the air supply 28 from where they come back from the top into the coating tunnel 24 flows.

If the cabin air through the existing filter modules 46 is not sufficiently freed from overspray particles, the filter modules 46 be further downstream filter stages, where the cabin air is supplied and in which, for example, fleece filter or electrostatic working separation filters are used, as they are known in and of themselves. If necessary, you can one or more such further filter stages also in the filter module 46 be integrated.

The filter module 46 is locked by means not shown locking device in its operating position. In the present embodiment, the filter module 46 fluidically with the louver 42 be connected or detached by being moved in the horizontal direction.

Generally, however, the coupling and decoupling depends on the interaction of the components and can also have vertical components of movement.

Each filter module 46 is designed to accommodate a maximum amount of paint, ie for a limit load with overspray, the type of the filter module 46 and depends on the materials used for this. The amount of paint already absorbed can only be used in 1 shown measuring device 56 be monitored. In 1 are as complementary or alternative components of such a measuring device 56 on the one hand, a balance 58 and on the other hand sensor 60a and 60b shown.

With the help of the balance 58 becomes the loading of the filter module 46 determined by its weight. At the sensor 60a it may be, for example, a layer thickness sensor, through which the thickness of the filter unit 50 constituting paint layer, which arises when depositing the overspray, can be detected. From the thickness of this layer can in turn draw conclusions about the loading amount of the filter module 46 getting closed. The sensor 60b For example, it can be a sensor for humidity, temperature or pressure. In particular, in the latter case, the presence of the boundary load can be detected by means of a differential pressure determination. The larger the loading of the filter module 46 is, the larger is the through the filter module 46 constructed air resistance.

If a filter module 46 reached its maximum capacity, the locking device is released and the fully loaded filter module 46 from the lower plant area 40 the coating booth 10 moved out.

Overall, the replacement of one or more disposable filter modules 46 fully or at least semi-automatic. Alternatively, such an exchange, for example, by means of a lift truck 62 done by a worker 64 what is at the coating station 20 in 2 is illustrated. For this purpose, the bottom portion of the filter module 46 be designed in its geometry and its dimensions as a standardized support structure and, for example, according to the specification of a so-called Euro-pallet.

Beforehand, the flow connection of the filter module to be replaced 46 with the louver 42 closed by not specifically shown locking slide. After the full filter module 46 has been removed, becomes an empty filter module 46 pushed into the operating position, in which this flow-tight with the louver 42 is connected, whereupon the locking device is locked again. The gate valve of the louver 42 is brought back into an open position, so that the repositioned filter module 46 flows through the cabin air.

The disposable filter module 46 can total, including its filter unit 50 , be made of a wet-strength recycled material. Generally speaking, one component, several components or all components of the filter module 46 be made of a wet-strength recycled material. For this purpose, for example, cellulosic materials such as optionally treated paper and cardboard materials, corrugated cardboard, cartons with standing wave, honeycomb cartons or wrapping cartons, but also other materials such. As MDF materials in question. The bottom area of the filter module 46 can also be formed separately by a Euro pallet made of wood. Also plastics such as in particular polyethylene or polypropylene come into question.

In this case, the filter module 46 even supplied as a modular kit in individual parts and at the site of the surface treatment plant 12 be assembled. For example, a filter module 46 also be designed so that it can be deployed from a collapsed configuration. A filter module kit has a volume that can be considerably smaller than the volume of the deployed or constructed disposable filter modules 46 , In 5 is a filter module kit 66 as folding pattern without filter unit 50 illustrated.

As mentioned above, it may happen without further measures that the filter modules 46 or their filter units 50 be added by depositing overspray and stick together, so that such a filter module 46 no more cabin air can flow through it before it has reached its limit load. In such a case, the relevant filter module 46 So already compared to the possible operating time and absorption capacity prematurely against an empty filter module 46 be replaced.

Also, liquid components of the overspray may be at the bottom of the filter modules 46 collect, which makes their handling in further recovery difficult. In particular, it must then be ensured that the filter modules 46 can not be tilted because the collected liquid components could otherwise leak out.

To prevent this, the coating booth includes 10 a filter aid 68 , with the help of which the air flow in a feed area 70 upstream of the disposable separation units 44 and / or the respective interior 48 the disposable separation units 44 a filter aid can be supplied.

At the feed area 70 upstream of the disposable separation units 44 In the present exemplary embodiments, this is the area of the flow path of the cabin air between the coating tunnel 24 and the disposable separation units 44 , Optionally, the cabin air, the filter aid material but also in the coating tunnel 24 be supplied, for example, in an area below the vehicle bodies 16 ,

As a filter aid, in particular a material is used which detackifies the overspray and / or can absorb liquid components of the overspray. Possible filter aids and their properties were explained at the beginning.

When in 1 embodiment shown includes the filter aid 68 several delivery elements in the form of nozzles 72 , which are just below the grating 38 arranged in the longitudinal direction of the coating booth 10 arranged one behind the other.

Always two nozzles 72 are as a nozzle pair 74 arranged so that filter aid material from the center to both sides in the feed area 70 is delivered. With the nozzles 72 For example, a nebulizable or nebulizable filter aid may be added to the feed area 70 be delivered.

The nozzles 72 be through a supply pipe 76 supplied with filter aid, which in turn is fed from a not specifically shown Filterhilfsmaterialquelle. Delivery components such as pumps, lines and control devices or the like for the filter aid are not shown specifically for the sake of clarity.

The filter aid is introduced in the direction of flow of the cabin air. In a modification, the nozzles 72 also on both sides of the louver 42 be arranged so that the filter aid from below in the direction opposite to the overspray laden cabin air in the feed 70 is introduced.

The cabin air laden with overspray takes this into the feed area 70 introduced filter aid, which detackifies the overspray and / or absorbs or binds liquid components of the overspray and so sticking the filter modules 46 or prevents fluid retention in these.

Optionally, forms on the walls of the filter modules 46 and their filter units 50 a barrier layer of filter aid, which prevents sticking of the wall areas occupied by the barrier layer.

In 2 is a coating booth as a second embodiment 10 ' shown, in which all components already described above bear the same reference numerals.

In contrast to the coating booth 10 to 1 are there across the coating booth 10 ' two filter modules each 46 arranged side by side, between which the collecting flow channel 54 is arranged. The louver 42 comprises two juxtaposed and downwardly open flow trays 78 the cabin air to the filter modules 46 lead and in this embodiment, the feed 70 define.

The nozzles 72 the filter aid 68 are there arranged so that they filter aid from below in countercurrent to the overspray laden cabin air in the feed 70 submit. In a modification not shown may alternatively or additionally nozzles 72 be present, the filter aid in the flow direction of the cabin air in the feed 70 submit.

In 3 is a coating booth as a third embodiment 10 '' shown, in which all components already explained above again bear the same reference numerals.

In contrast to the coating booth 10 ' to 2 is the conveyor system 32 There, set up so that the vehicle bodies 16 rotated and thus can be conveyed transversely to the transport direction. This may be desirable, for example, when the front portion of the vehicle body 16 with a first coating material, for example a top coat of a first color, and the rear area of the vehicle body 16 be coated with a second coating material, such as a topcoat of a second color, and the different coating materials are to be collected largely separated sorted.

These are the flow trays 78 through a centrally arranged vertical guide bulkhead 80 in the direction down from the grate 38 fluidically separated from each other. The cabin air is thereby divided into two partial flows, in each of which overspray of the first or the second type of material predominates.

The nozzles 72 the filter aid 68 are there again arranged so that they filter aid from below in countercurrent to the overspray laden cabin air in the feed 70 submit. In a modification not shown, alternatively or additionally, here also nozzles 72 be present, the filter aid in the flow direction of the cabin air in the feed 70 submit.

In 4 is as a fourth embodiment, a coating booth 10 ''' shown, in which again all components already described above bear the same reference numerals.

The coating booth corresponds in construction 10 ''' the coating booth 10 '' according to 3 with guide bulkhead 80 However, it can also be like the coating booths 10 and 10 ' be educated. In 4 Two alternative or complementary concepts to those discussed above are shown to deliver filter aid.

In 4 on the left a concept is shown, can be used with the filter aid, which can not or can not be easily atomized or atomized. Such filter aid may be in the form of, for example, granules and also in the form of coarse or coarse granules consisting of overspray-loaded filter modules 46 is gained in a recycling process. This will be related below 5 again in detail received.

The filter aid 68 includes conveyor units 82 with which the filter aid from a respective supply line 84 to the walls 42a the louver 42 can be promoted. There, the filter aid trickles on the walls 42a towards the filter modules 46 down into which it slips in and there can absorb well liquid components of the overspray. In the present embodiment, the conveyor units 82 as a screw conveyor 86 educated.

In 4 on the right, a concept is shown where the filter aid is not in the feed area 70 upstream of the filter modules 46 but directly to the interior 48 the disposable separation unit 44 is supplied. For this purpose, nozzles open 72 the filter aid 68 directly into the interior 48 the filter modules 46 , In this way, the filter aid material is directly on the walls of the filter modules 46 led on which it forms a barrier.

If the internal structure of the accommodated there filter unit 50 it allows, also their interior can be acted upon directly with filter aid. In this case, includes a disposable separation unit 44 For example, a connection piece from the outside of the separation unit 44 into the interior of the filter unit 50 ,

Overspray loaded filter modules 46 , after reaching their limit loading during operation of the coating booth 10 . 10 ' . 10 '' or 10 ''' against an empty and unloaded filter module 46 can be used in different ways. The loaded filter modules 46 depend on which treatment cabin 10 or treatment station 18 . 20 or 22 they come loaded with different types of overspray.

The loaded filter modules 46 be in a treatment plant 88 a treatment treatment to produce a treatment material, which allows a subsequent recovery. This is therefore based on 5 explains which the treatment plant 88 illustrated with exemplary treatment stations. There is also again very schematically a coating booth 10 shown, the coating tunnel 24 with the conveyor system 32 as well as their lower plant area 40 with the feed area 70 and the filter modules 46 Marked are. The coating system 10 is also representative of the coating booths 10 ' . 10 '' . 10 ''' ,

In a drying station 90 become the loaded filter modules 46 dried. By drying, all processes are meant in which the recorded overspray can be cured, be this by expelling solvents or by crosslinking the coating substance. For this purpose, the overspray, for example, with electromagnetic radiators 92 gelled or by blowers 94 be tempered with warm air.

In a crusher station 96 become the filter modules 46 coarsely shredded or reduced. This can be done, for example, by a cutting device 98 done in which the individual filter modules 46 in smaller filter parts 100 be cut. Alternatively, the filter modules 46 for example, in a pressing device 102 to a smaller filter package 104 be pressed together.

The filter modules 46 or the filter parts 100 or the filter packages 104 can in a shredder station 106 with the help of a shredder device 108 to coarse shredder material 110 and optionally with the help of a shredding device 112 to fine shredder material 114 are processed. This may optionally be in a mill 116 even further to powder material 118 be ground.

In each case additives can be added to the consistency of the shredding material 110 or 114 or its properties, in particular its calorific value, to change and influence. This is each by a conveyor belt 120 indicated. Thus, for example, stone and wood materials in the form of flours, powders or dusts can be added both as a binder and to increase the calorific value. For example, the fine shredder material 114 the shredder device 108 fed and there with the shreddering filter modules 46 , Filter parts 100 or filter packages 104 be mixed.

With the powder material 118 after passing through the mill 116 Then, for example, the inner walls of the filter module kits 66 be pre-coated, at which the overspray laden cabin air will flow along.

The powder material 118 is used alternatively or additionally as a filter aid to the coating booth 10 promoted and there in the manner described above the feed area 70 the coating plant 10 or the interior 48 the filter modules 46 fed. The fine shredder material 114 on the other hand, for example, according to the feeding concept 4 be used for coarse or coarse filter aid.

In addition, the material of the filter modules 46 be used as a carrier material for pastes or liquids that arise elsewhere as waste products and should be disposed of or incinerated and where the further treatment is difficult because of their consistency, pasty or liquid.

The illustrated treatment stations 90 . 96 . 106 should only be an example and also stand for not specifically explained treatment treatments, of which depending on the filter modules 46 and the overspray taken by them can be traversed by all but a few or even a single one.

The fine shredder material 114 can also be further processed, so that by means of the treatment plant 88 a treatment material 122 which is opposite to the starting material in the form of the loaded filter modules 46 may have other physical properties. For example, the volume, the density, the structure, the consistency and / or the moisture and the like have been changed by the treatments and optionally adjusted in a targeted manner.

Also the chemical properties of the treatment material 122 can be compared to the loaded filter modules 64 have been changed. In particular, properties such as combustibility, flash point, pH, adhesiveness and the like are mentioned here.

In the production of the treatment material 122 can also be ensured that the treatment material 122 is storable, so that the processing material 100 after the treatment plant 70 initially stored and optionally collected. For example, the resulting conditioning material 100 be designed for landfill disposal or thermal recycling.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202011107555 U1 [0015, 0020]

Claims (9)

Method for operating a surface treatment plant ( 12 ), in which overspray, in one or more coating booths ( 10 ), received by an air stream and to at least one disposable separation unit ( 44 ), in which overspray is separated and which, after reaching a boundary loading with overspray, is loaded as a loaded disposable separation unit ( 64 ) against an empty disposable separation unit ( 44 ), characterized in that the air flow in a feed area ( 70 ) upstream of the at least one disposable separation unit ( 44 ) and / or the interior ( 48 ) the at least one disposable separation unit ( 44 ) a filter aid is supplied. A method according to claim 1, characterized in that the filter aid material is particulate or granular and / or has a fiber or cavity structure. A method according to claim 2, characterized in that a filter aid material is used, which can be atomized or atomized. A method according to claim 2 or 3, characterized in that a powder material is used as filter aid. Method according to one of claims 2 to 4, characterized in that the filter aid material is particulate with a mean particle diameter of 10 .mu.m to 100 .mu.m. Method according to one of claims 1 to 5, characterized in that a material is used as the filter aid, which comprises one or more of the following materials: lime, stone powder, in particular limestone, aluminum silicates, aluminum oxides, silicon oxides, powder coatings, natural or synthetic zeolites, preferably Calcium, magnesium, calcium-magnesium, sodium and / or potassium zeolites, fiber materials, polymer or glass materials, material recovered from spent disposable precipitators ( 114 . 118 ). Device for separating overspray from the overspray-laden cabin air of surface treatment plants, in particular paint shops, with a) at least one disposable separation unit ( 44 ), through which cabin air laden with overspray can be conducted and in which overspray separates; wherein b) the disposable separation unit ( 44 ) as a replaceable unit with an interior ( 48 ) is formed, in which a filter unit ( 50 ) is housed; c) the airflow laden with overspray via an air guiding device ( 42 ) to the disposable separation unit ( 44 ) is conductive, characterized in that d) a filter auxiliary device ( 68 ) is present, by means of which da) the air flow in a feed area ( 70 ) upstream of the at least one disposable separation unit ( 44 ) and / or db) the interior ( 48 ) the at least one disposable separation unit ( 44 ) A filter aid material can be fed. Apparatus according to claim 7, characterized in that the filter aid device ( 68 ) Nozzles ( 72 ), via which atomizable or nebulizable filter auxiliary material the feed area ( 70 ) and / or the interior ( 48 ) the at least one disposable separation unit ( 44 ) can be fed. Apparatus according to claim 7 or 8, characterized in that the filter auxiliary device ( 68 ) one or more conveyor units ( 82 ), in particular screw conveyors ( 86 ), by means of which particulate or granular filter aid material the feed area ( 70 ) and / or the interior ( 48 ) the at least one disposable separation unit ( 44 ) can be fed.

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