Booth system for surface treatment of an item

Abstract

A booth system (100) for surface treatment of items comprising a booth (1) and a filter unit (50) is described. The booth (1) comprises air inlets (112) provided in an upper part of the booth and air outlets (114) provided in the lower part of the booth. The filter unit (50) comprises an air intake (54) and an air exhaust (56) and one or more filters, where at least one of the filters is an activated carbon filter.The booth's air outlet (114) is connected to the filter unit air intake (54) via a first tube-like connection (130) and the filter unit air exhaust (56) is connected to the booth air inlet (112) via a second tube-like connection (120). The filter unit and booth are thus arranged in fluid communication. The booth system also comprises a ventilator configured to generate air flow throughout the booth system. The booth system takes up little space and is easy to transport and bring into contact with objects and allows for surface treatment without the need for a person to stay inside the booth itself while performing the work.

Description

[0001] BOOTH SYSTEM FOR SURFACE TREATMENT OF AN ITEM

[0002] Field of the invention

[0003] The present invention relates to a booth system for surface processing of an item.

[0004] The booth system comprises a booth and a filter unit. The booth comprises air inlets provided in an upper part of the booth and air outlets provided in the lower part of the booth. The filter unit comprises an air intake and an air exhaust and one or more filters, where at least one of the filters is an activated carbon filter.

[0005] The booth’s air outlet is connected to the filter unit air intake via a first tube-like connection and the filter unit air exhaust is connected to the booth air inlet via a second tube-like connection. The filter unit and booth are thus arranged in fluid communication.

[0006] The booth system also comprises a ventilator configured to generate air flow throughout the booth system.

[0007] The booth system takes up little space and is easy to transport and bring into contact with objects and allows for surface treatment without the need for a person to stay inside the booth itself while performing the work.

[0008] Background of the invention

[0009] The present invention is developed in connection with surface processing of items, including surface treatment of smaller items, but also surface treatment of a smaller area of a larger surface. This type of processing is called spot treatment or spot processing.

[0010] Until now, surface processing or treatment such as spot painting of even small areas on a car, such as bumpers, doors, fenders and the like, has required a paint booth. The car is placed in the paint booth and areas not to be painted are covered and the smaller area to be painted is spot painted. Through this procedure, the person doing the painting will be in the paint booth and must be wearing safety equipment. The same approach is used for grinding and welding and similar spot processing. The car occupies a full-size booth which, for capacity reasons, makes it difficult to perform minor damage repairs on a car in a traditional booth.

[0011] Similarly, this has been an issue with refurbishing of smaller items like car rims. Car rim refurbishment typically includes surface treatment in the form of painting or alternatively clear coating on the rims. Painting or coating car rims also takes up an entire paint booth, which, for capacity reasons, makes it difficult to coat car rims in a traditional paint booth.

[0012] This has meant that car rims are often discarded instead of being refurbished. This is obviously a disadvantage, as there are typically four or eight rims associated with each car, depending on whether you have all-season tires or winter and summer tires for a car.

[0013] To relieve the workload in paint booths, there is a desire for an alternative way for surface treatment of the rims and spot treat surface parts of a car where the use of a traditional booth is not required.

[0014] DK 181271 Bl and DK 181256 Bl describe a mobile booth for spot processing a limited area and an openable booth meant for smaller parts, respectively. Both booths are closed during use.

[0015] Object of the Invention

[0016] It is an objective of the present invention to achieve a booth system for surface treatment of items, where this system can be operated as stand-alone systems without access to air extraction.

[0017] It is a further objective of the present invention to achieve a booth system with a closed air flow that cleans and recirculates air. It is a further objective of the present invention to achieve a modular booth system wherein the booth and the filter unit are separate units for easy handling or optimal combination of filter and booth depending on the intended use.

[0018] Description of the Invention

[0019] This is achieved according to the present invention with a booth system for surface treatment of items. The booth system is of the type mentioned above and is characterized by the fact that it is a stand-alone system comprising a booth and a filter unit.

[0020] The booth system may be a modular system comprising a combination of a booth, a filter unit, a first tube-like connection and a second tube-like connection.

[0021] The booth system may be beneficial in providing a booth system with a closed air flow that cleans and recirculates air.

[0022] It may furthermore be beneficial in proving a modular booth system wherein the booth and the filter unit are separate units for easy handling. Furthermore, the modular system supports achieving a booth system for with the optimal combination of filter and booth depending on the intended use or for replacing a non-working unit without replacing the entire system. This may be beneficial both considering costs, down-time and use of resources.

[0023] The booth comprises air inlet provided in an upper part of the booth and air outlet provided in the lower part of the booth.

[0024] The filter unit comprises an air intake and an air exhaust and one or more filters, where at least one of the filters is an activated carbon filter.

[0025] The booth’s air outlet is connected to the filter unit air intake via a first tube-like connection and the filter unit air exhaust is connected to the booth air inlet via a second tube-like connection. The filter unit and booth are thus arranged in fluid communication. The booth system comprise a ventilator configured to generate an air flow through the booth from the booth’s air inlet to the booth’s air outlet, further through the first tubelike connection to the filter unit intake, through the filter unit to the filter unit exhaust and back to the booth’s air inlet through the second tube-like connection. This enables a closed air-flow booth system that cleans and recirculates the air.

[0026] The booth system according to the invention is a simple construction that can easily be placed in workshops without requirements for air extraction, ventilation, circulation, and the like.

[0027] The filter unit can be placed at a given distance from the booth and can ensure that the recirculated air is handled according to environmental regulations.

[0028] In one embodiment, the filter or one of the filters may be a high energy activated carbon filter with a plurality of filter bags so that it also acts as a particle filter.

[0029] The filter unit can advantageously comprise multiple intakes and / or multiple filters so that the filter unit can be adapted to a specific usage. Alternatively, the filter unit with multiple intakes can be adapted to multiple usages by connecting a given filter to a specific intake where the filter is configured for a specific usage.

[0030] The ventilator can be placed in the filter unit or in connection with the air outlet in the booth to reduce the risk of turbulence in the booth and thus the risk of contaminating the item to be coated.

[0031] The same power in the filter unit can ensure a more laminar air flow through the filters, which can be beneficial for optimal filter utilization.

[0032] According to an embodiment, the booth may comprise a perforated panel for forming a space in the booth between the bottom and the perforated panel.

[0033] This compartment can be used to collect surplus material from the surface treatment and / or a particle filter. The air exhaust can be provided at the bottom of the booth in the space created between the perforated panel and the sealed bottom panel of the booth.

[0034] According to an embodiment, the booth’ s air outlet, booth’ s air inlet, filter unit air intake and / or filter unit air exhaust may comprise tube couplings configured for mounting the first or second tube-like connection.

[0035] According to an embodiment, the filter unit and / or the booth may comprise wheels which enable easy movement of the filter unit and / or the booth along an approximately horizontally oriented surface.

[0036] Using wheels on the booth or filter unit, respectively, enables easy relocation of the units so that the booth system can be easily and quickly moved to another location where it is needed. Alternatively, the booth can be moved to a confined area in a workshop where it will take up very little space when not in use.

[0037] Air extraction is advantageously provided in the lower part of the booth, similar to traditional booths. Excess or waste material generated during processing will fall to the bottom and extraction will therefore be more efficient when performed at the bottom of the booth.

[0038] According to an embodiment, the filter unit may comprise a VOC sensor arranged after the activated carbon filter and before or in connection with the air exhaust for measuring volatile organic compounds in the air flow out of the air exhaust of the filter unit and configured to provide a sensor signal indicative of a level of the amount of VOC in the air flow.

[0039] The booth system may also comprise a controller configured to receive the sensor signal from the VOC sensor and configured to provide an alarm signal as a function of the measured VOC level.

[0040] Alternatively, the filter unit can comprise a plurality of sensors or other types of sensors to measure other parameters, e.g. air speed, particle contents etc. By monitoring the VOC level in the air exhaust, the booth system can be operated with a control to give a tactile alarm and / or interrupt the power supply to processing units in use that may cause an increased VOC level.

[0041] Alternatively, using e.g. an air velocity sensor, the controller can signal that there is a risk of explosion if the air exchange in the booth is too low. This could for example be caused by blockage of the fluid connection between the booth and the filter unit, blocked filters etc.

[0042] The tactile alert could be in the form of a visual and / or audio indicator.

[0043] According to one embodiment, the booth may comprise:

[0044] - fixed sides, top and bottom, and door for closing the booth during operation to achieve a closed booth when in use,

[0045] - at least one treatment unit to perform the surface treatment,

[0046] - an item holder provided with mounting means (62) for releasably retaining the item, and

[0047] - a controller connected to at least one treatment unit and configured to control it during operation.

[0048] The booth is a simple construction that can easily be placed in workshops or transported in a car. The booth simply needs to be sized according to the actual items that the booth needs to be suitable for handling.

[0049] The openable booth is intended for automated surface treatment where the item is placed in the item holder, after which the surface treatment is controlled via the controller either as programmed control or manual input to the controller.

[0050] According to a further embodiment, the treatment unit may comprise an application unit with spray nozzles for applying a curable liquid.

[0051] The curable liquid can be a UV or IR curable liquid that can be provided in the form of clear lacquers or colors for a desired coloring of the part. According to a further embodiment, the treatment unit may comprise a curing unit arranged to cure the curable liquid.

[0052] The curing unit can be in the form of a UV light source or an IR heat source.

[0053] According to a further embodiment, the item holder may be arranged to rotate the item holder about a rotational axis, enabling rotation of the item.

[0054] The device can consist of two treatment units, where the first treatment unit comprises spray nozzles and the second treatment unit comprises an illumination unit equipped with UV light sources, e.g. The rotatable item holder enables the application and curing of UV curable liquid on even complex item shapes.

[0055] When applying surface treatment with UV curable liquid, it is essential that the item is rotated and / or angled relative to the UV light, or alternatively rotating the item using the second treatment unit under the UV light. This is especially important with complicated constructions such as car rims that have many surfaces and holes that can be difficult to reach if there is no rotation and / or angling of the item.

[0056] Alternatively, it would also be possible to place the item in a fixed position in the booth and instead rotate UV light sources around the item.

[0057] According to one embodiment, the booth may comprise:

[0058] - sides, bottom and top, wherein a first side is open and wherein along a defining edge area to the open side a flashing sheet of a flexible material is mounted in abutment with a surface where an area of the surface is to be surface treated, which flashing sheet at its free edge area has an edge area provided with sealing means adapted to establish a sealing abutment with the surface enclosing the area to be spot treated and wherein the other sides comprise side walls,

[0059] - one or more windows provided in at least one of the other side walls for visual insight into the booth,

[0060] - armholes provided in one or more of the other side walls, which are provided with flexible material for tight connection against the arms of a person standing outside the booth and where in use the booth achieves a closed booth. In use, the booth is thus an enclosed booth where the surface to be processed both forms one side of the booth and is available for processing inside the booth. A booth that can be operated from the outside.

[0061] The technical effect achieved with the booth system is easy and efficient spot processing of surface parts with limited space requirements and without access to filter extraction or where the exhaust capacity is limited. Furthermore, an environmental benefit can be achieved by not having to stay inside the booth itself for the person doing the processing.

[0062] The mobile booth will, in principle, consist of the area enclosed by the bottom, top, sides and the flashing sheet.

[0063] Due to its flexibility, the flashing sheet can be adapted to different types of surfaces and can therefore easily be placed in a sealing system against the surface of a car, for example. This can be done in the traditional way by taping the flashing sheet to the surface of the car. Likewise, the flashing sheet can be taped to the defining edge area of the booth. This makes it easy to exchange the flashing sheet and replace it with a new flashing sheet. Alternatively, the flashing sheet can be mounted more firmly on the defining edge area of the booth so that it can be reused several times. In this situation, fastening can be done, for example, by clamping rails that clamp an edge area on the flashing sheet.

[0064] The flashing sheet can be made of different materials suitable for a given usage, such as plastic.

[0065] The roofing sheet can be fitted with channels that can contain stiffening tubes, as is known from tents, for example. This allows the flashing sheet to easily maintain a stretched state, which facilitates installation on the object to be spot processed.

[0066] By providing the booth with windows, the person standing outside the booth can perform spot processing and have a continuous visual orientation of the work in progress. Because the person is located outside the booth, there is no need for respiratory protection or similar. The person's arms inserted through the armholes will be in close contact with the flexible material. For example, elastic cuffs with star-shaped openings that ensure a tight fit against the user's arms and at the same time will not be a nuisance or impede work performance. Alternatively, the user's arms can be covered with elongated bag-shaped gloves so that the arms that are inside the booth are covered by these bagshaped gloves. In this way, the person performing the work will not come into contact with materials, vapors, sparks, or other derived materials / phenomena that are emitted or occur in connection with the spot processing work.

[0067] According to a further embodiment of the invention, the booth is characterized in that the flashing sheet is mounted on the defining edge area with tape and that the sealing means at the free edge area of the flashing sheet comprise tape.

[0068] As mentioned previously, tape would be an appropriate way to secure the flashing sheet to the defining edge area, as well as a suitable sealant and fastener against the surface to be treated / processed. As mentioned above, the flashing sheet does not need to be mounted with tape, both at the object and at the free edge area of the booth.

[0069] Using tape, for example, can achieve a masking that is roughly equivalent to traditional masking of an area used in traditional spot painting.

[0070] The object of the invention can be achieved by using the booth system according to the described embodiments for spot processing, where the spot processing concerns welding, grinding or other processing, painting and similar processing work.

[0071] The object of the invention can be achieved by using the mobile booth according to the described embodiments for spot processing, where the spot processing relates to welding and where the one or more windows of the booth are made of a material for this usage.

[0072] The windows can be made of welded glass or other material with similar built-in safety parameters, where the booth user is still guaranteed a visual view into the booth.

[0073] The air exhaust in the booth can also be advantageously designed for this usage. This further ensures that no fumes accumulate in the booth that impair visibility in the booth during work or are released when the booth is removed from the object being worked on.

[0074] The object of the invention can be achieved by using the mobile booth according to the described embodiments for spot processing, wherein the spot processing relates to metal grinding and wherein the windows of the booth are made of a material for this usage.

[0075] The air exhaust in the booth can also be advantageously designed for this usage. This also ensures that there is no metal dust in the booth that obstructs the view into the booth during work or is released when the booth is removed from the object being worked on.

[0076] The windows can therefore be designed with a scratch-free surface on the side facing the booth or made of a scratch-free material, so that the user of the booth is still guaranteed a visual view of the booth during repeated use of the booth.

[0077] The object of the invention can be achieved by using the mobile booth according to the described embodiments for spot processing, wherein the spot processing relates to painting and wherein the air exhaust in the booth is adapted for this usage.

[0078] The air exhaust can be adjusted to ensure that no toxic fumes accumulate in the booth and are released when the booth is removed from the object being worked on.

[0079] One objective of the invention can also be achieved by a method of obtaining the booth system by

[0080] - firstly, providing a booth, a filter unit, a first tube-like connection adapted to be connected to the booth’s air outlet and the filter unit air intake, and a second tube-like connection adapted to be connected to the filter unit air exhaust and the booth air inlet. The four modules being according to any one of the embodiments disclosed herein, and

[0081] - secondly, connecting the first tube-like connection to the booth’s air outlet and the filter unit air intake, and connecting the second tube-like connection to the filter unit air exhaust and the booth air inlet.

[0082] One objective of the invention can also be achieved by a method which is characterized in that the method comprises steps of:

[0083] - providing a booth system comprising a booth with a flashing sheet according to embodiments described herein, - positioning the booth close to the object to be spot processed with the open side facing the object,

[0084] - covering the area between the object and the booth's defining edge area to the open side,

[0085] - connecting a first tube-like connection to the booth’s air outlet and the air intake of the filter unit,

[0086] - connecting a second tube-like connection to the booth’s air inlet and filter unit air exhaust,

[0087] - activation of the ventilator,

[0088] - provide a processing unit inside the booth,

[0089] - a person puts their arms through the armholes and, in a standing or sitting position outside the booth, performs a processing inside the booth of the area to be spot treated, while having visual control of the spot treatment through one or more of the one or more windows.

[0090] One objective of the invention may alternatively be achieved by a method which is characterized in that the method comprises steps of:

[0091] - providing a booth system with an openable booth according to embodiments described herein,

[0092] - connecting a first tube-like connection to the booth’s air outlet and the air intake of the filter unit,

[0093] - connecting a second tube-like connection to the booth’s air inlet and filter unit air exhaust,

[0094] - positioning of the item to be spot processed inside the booth,

[0095] - closing the door,

[0096] - activation of the ventilator.

[0097] Description of the Drawing

[0098] The invention will hereafter be described with reference to the accompanying schematic drawing wherein:

[0099] Fig. 1 shows an embodiment of the booth system with an openable booth.

[0100] Fig. 2 shows a different embodiment of the booth system with a canopied booth. Fig. 3 shows a perspective view of a filter unit according to the invention, wherein the filters contained in the filter unit are shown, and

[0101] Fig. 4 shows a perspective view of an additional embodiment of the filter unit with mounted cover panel above the filters and a filtration wall.

[0102] Fig. 5 shows a side view of a booth according to the invention, in which the flashing sheet is shown in a partially stretched state to illustrate contact with an irregular surface,

[0103] Fig. 6 shows an image of the booth in fig. 5 seen from the right side in fig. 5,

[0104] Fig. 7 shows perspective images of a further embodiment of the booth seen from the side in a section through the booth and from the user’s position. The flashing sheet is not shown.

[0105] Fig. 8 shows a schematic illustration of an openable booth.

[0106] Fig. 9-14 shows further embodiments of the openable booth.

[0107] Detailed description of the invention

[0108] In the various figures, the same part will be labeled with identical reference designations and thus not all design details are explained in connection with each figure.

[0109] Fig. 1 shows an embodiment of the booth system 100 comprising an openable booth 1 with air inlet 112 provided in an upper part of the booth and air outlet 114 provided in the lower part of the booth, and a filter unit 50 with an air intake 54 and an air exhaust 56.

[0110] The booth’ s air outlet 114 is connected to the filter unit air intake 54 via a first tube-like connection 130 and the filter unit air exhaust 56 is connected to the booth air inlet 112 via a second tube-like connection 120. This ensures that the filter unit and the booth are arranged in fluid communication.

[0111] The booth system comprises a ventilator 140 (not shown) configured to generate an air flow through the booth from the booth’s air inlet to the booth’s air outlet, through the first tube-like connection to the filter unit intake, through the filter unit to the filter unit exhaust, and back to the booth’s air inlet through the second tube-like connection, enabling a booth system with a closed air flow that cleans and recirculates the air. Fig. 2 shows another embodiment of the booth system 100. Compared to the embodiment in fig. 1, the booth has been exchanged with a booth with a cover.

[0112] Fig. 3 and 4 illustrate two alternative embodiments of a filter unit 50. The filter units are configured to be mounted in fluid communication with booth 1 via air intake 54.

[0113] The filter units comprise one or more filters 52, which may be active, replaceable and / or self-cleaning.

[0114] Filter units can be designed with filters suitable for specific usages, such as activated carbon filters to clean air of VOC connections or particle filters to name a few, without limiting which filters can be used.

[0115] The illustrated embodiments also comprise air exhaust 56 and in connection with both air intake 54 and air exhaust 56 a tube coupling is fitted. The filter system may include a ventilator mounted in connection with air exhaust 56, so that air flows through the filter unit from air intake 54 to air exhaust 56.

[0116] The filter unit in fig. 3 is illustrated with a sensor 60. In the illustrated embodiment, the sensor is arranged after the filters 52 and in connection with air exhaust 56. The sensor can be a VOC sensor to measure volatile organic compounds in the air flow out of the filter unit's air exhaust. The sensor can alternatively be designed to measure air speed, particle content, or similar in relation to the intended use of the booth system. The filter unit can alternatively comprise multiple sensors.

[0117] The sensor is configured to provide a sensor signal 62 indicating a measurement value or level, for example a threshold value for the amount of VOC in the air flow, a threshold value for a minimum air flow, or the like.

[0118] The booth system may further comprise a controller 70 configured to receive the sensor signal 62 from the sensor 60 and further configured to provide an alarm signal 72.

[0119] The alarm signal 72 can be an electrical signal used to control a work unit used in a booth connected to the filter unit. The alarm signal can, for example, be used to turn off the work unit. For example, the booth system may be configured for use when painting a surface where the sensor is a VOC sensor and where the system should turn off a spray gun if the measured VOC content in the exhaust air exceeds a predetermined threshold.

[0120] Fig. 3 shows the controller in connection with the filter unit. The controller can be implemented in the booth, filter unit, or in the system as a stand-alone unit.

[0121] The filter unit in fig. 3 is illustrated as comprising a plurality of air intakes, allowing a multi-purpose booth to be connected to a first air intake for a first usage and a second air intake with a second usage if the filter unit is divided with different filters designated for specific air intakes and usages.

[0122] The filter unit 50 in fig. 4 differs from that shown in fig. 3 by comprising filtration wall 58. The filter unit 50 is illustrated with a cover panel mounted above the filters 52. The filtration wall can ensure that the filter unit can also be used as a stand-alone filter unit, allowing additional use of the filter unit for e.g. continuous cleansing of the ambient air in a workplace.

[0123] Fig. 5-6 show a schematic view of a booth 1. This is intended for spot processing small areas on a surface of a car (not shown) or other objects.

[0124] The booth 1 is equipped with a first side 2, to which a flexible flashing sheet 4 is attached along a defining edge area 3. The flexible flashing sheet 4 can be brought into contact with the surface where spot processing is required. At its free edge area 5, the flashing sheet 4 is provided with sealants in the form of tape 5', which can establish a sealing contact with the surface. Thus, an area 6 that contains the smaller area to be spot processed on the surface is enclosed.

[0125] The booth comprises other sides 14 as well as a top 7 and a bottom 8. Wheels 9 are mounted at the bottom 8 for easy transportation of the booth, as indicated by the arrow 10. The sides 14 comprise other side walls 14'. At the top 7 there is a top panel. At the bottom there is an air outlet 114, which via a flexible tube, the first tube-like connection 130 is arranged to be connected to the filter unit (not shown). In the other side walls 14', windows 15 are provided. The windows 15 allow an operator standing outside the booth to see the work being done with the help of a processing unit inside the booth. The other side walls 14' are also equipped with arm holes 16, which allow the person to stand outside the booth and have their arms inside the processing area 6. The person can thus perform the work without the need for protective equipment.

[0126] The armholes are fitted with a cuff that can have a star-shaped opening and is formed from a flexible material. This makes it easy for a user to insert their arm through the opening, and the flexible material of the cuff ensures a tight fit to the user's arms. There is no risk of contaminated air escaping through the openings. A seat 19 is mounted on the side wall 14' at the front of the booth 14.

[0127] Figure 7 illustrates an alternative embodiment of a booth 1. The booth 1 in this embodiment differs in that it does not comprise a seat and the armholes 16 have a different shape and location. The illustrations in figure 7 also show an example of how the booth can be implemented with a ventilator mounted in connection with the air outlet to achieve air flow through the booth from the air inlet.

[0128] Figure 7 shows that a perforated bottom panel 27 is provided in the lower part of the booth. You can also see a ventilator mounted in connection with the air outlet.

[0129] Fig. 7 further illustrates an embodiment of the booth with tube coupling configured for mounting a tube-like connection between the mobile booth and the filter unit, here the tube-like connection is illustrated by a flexible tube 130.

[0130] Figures 8A-8D show a schematic illustration of an openable booth 1 seen from the top and side, respectively. The booth here is designed as a paint booth with air inlet and air outlet, as illustrated in figure IB- ID with the arrows at the top and bottom of the paint booth. The paint booth can comprise a door (not shown) to close the paint booth during operation.

[0131] The apparatus comprises an application unit 80 with spray nozzles for applying a UV curable liquid to an item. The applicator unit is mounted in a guide in a displaceable manner. The apparatus in the embodiment shown also comprises an item holder 90 provided with mounting means 92 for retaining the item. The item is detachably mounted in the item holder for easy attachment and removal.

[0132] The item holder is designed to rotate the item holder around a rotary axis 94, enabling rotation of the item.

[0133] The rotation of the item during operation is illustrated in figures 8B-D. The treatment unit may comprise an illumination unit equipped with UV curing light to cure the UV curable liquid after it has been applied to e.g., a rim.

[0134] Figures 9-14 show further embodiments of the openable booth 1, where examples of possible booth designs are shown more explicitly and where the subject is a rim.

Claims

CLAIMS1. A booth system (100) for surface treating an item, wherein the booth system comprises a combination of:- a booth (1) having air inlet (112) provided in an upper part of the booth and air outlet (114) provided in the lower part of the booth, and- a filter unit (50), where the filter unit (50) comprises an air intake (54) and an air exhaust (56) and one or more filters (52), where at least one of the filters being an activated carbon filter,- a first tube-like connection (130) connected to the booth’s air outlet (114) and the filter unit air intake (54), and- a second tube-like connection (120) connected to the filter unit air exhaust (56) and the booth air inlet (112), so that the filter unit (50) and the booth (110) are arranged in fluid communication, via the first and second tube-like connections, where the booth system (100) comprises a ventilator (140) configured to generate an air flow through the booth from the booth’ s air inlet to the booth’ s air outlet, further through the first tube-like connection to the filter unit intake, through the filter unit to the filter unit exhaust, and back to the booth’s air inlet through the second tube-like connection, enabling a booth system with a closed air flow that cleans and recirculates air, wherein the booth and the filter unit are separate units, wherein the filter unit and the booth comprise wheels, which enable easy movement of each of the filter units (50) and the booth along an approximately horizontally oriented surface, and wherein the booth’s air outlet, the booth’s air inlet, filter unit air intake, and / or filter unit air exhaust comprise tube couplings (28) configured for mounting the first or second tube-like connection.

2. The booth system (100) according to claim 1, wherein the booth (1) comprises a perforated panel (27) for forming a space in the booth between the booth’s floor and the perforated panel.

3. The booth system (100) according to any one of the preceding claims, wherein the filter unit (50) comprises a VOC sensor (60) arranged after the filters (52) and in communication with the air exhaust (56) for measuring volatile organic compounds in the air flow out of the filter unit air exhaust and configured to provide a sensor signal (62)indicative of a level of the amount of VOCs in the air flow, and that the booth system comprises a controller (70) configured to receive the sensor signal from the VOC sensor and configured to provide an alarm signal (72) as a function of the measured VOC level.

4. The booth system (100) according to any one of the preceding claims, wherein the booth comprises fixed sides, top and bottom, and a door for closing the booth during operation to provide a closed booth in use,- at least one treatment unit (80) to perform the surface treatment,- an item holder (90) provided with mounting means (92) for releasably retaining the item, and- a controller (70) connected to the at least one treatment unit and configured to control the at least one processing unit during operation.

5. The booth system (100) according to claim 4, wherein the treatment unit (80) comprises an application unit with spray nozzles for applying a curable liquid.

6. The booth system according to claim 4 or 5, wherein the treatment unit comprises a curing unit arranged to cure the curable liquid.

7. The booth system according to any one of the preceding claims, wherein the item holder (90) is arranged to rotate the item holder about a rotational axis (94), enabling rotation of the item.

8. A booth system according to any of claims 1-3, wherein the booth (1) comprises sides (14), bottom (8) and top (7), wherein a first side (2) is open, and wherein along a defining edge area (3) to the open side a covering sheet (4) of a flexible material is mounted which can be brought into contact with a surface, wherein an area of the item is to be surface-treated, which flashing sheet has at its free edge area (5) an edge area provided with sealing means adapted to establish a sealing abutment against the surface enclosing the area (6) to be treated and wherein the other sides comprise side walls (14),- one or more windows (15) provided in at least one of the other side walls (14) for visual viewing of the booth,- armholes (16) provided in one or more of the other side walls and which armholes are provided with flexible material for tight connection against the arms of a person standing outside the booth and where the booth in use achieves a closed booth.

9. A method of obtaining a booth system according to any one of the preceding claims by:- providing according to any one of the preceding claims:- the booth (1),- the filter unit (50),- the first tube-like connection (130) adapted to be connected to the booth’s air outlet (114) and the filter unit air intake (54), and- the second tube-like connection (120) adapted to be connected to the filter unit air exhaust (56) and the booth air inlet (112),- connecting the first tube-like connection (130) to the booth’s air outlet (114) and the filter unit air intake (54), and- connecting the second tube-like connection (120) to the filter unit air exhaust (56) and the booth air inlet (112).

Images