Hot gas device for providing hot gas and coating device and method for coating workpieces

Abstract

The invention relates to a hot gas device (10) for supplying hot gas to a coating device (1) for coating workpieces (2) with a coating material (3), in particular for coating narrow sides (4) of plate-shaped workpieces (2) with a narrow-area coating material, with an energy source (11) for supplying the hot gas and with at least one hot gas guide path (12) for supplying the hot gas to a deflection device (9), wherein the deflection device (9) has at least one outlet opening (13) to activate a functional layer provided on the coating material (3) and / or on the workpiece (2) with the hot gas, wherein a cooling device (14) is provided.by which at least the deflection device (9) and / or the workpiece (2) and / or the coating material (3) and / or the energy source (11) can be cooled, as well as a coating device (1) and a method for coating workpieces (2) with a coating material (3).

Description

[0001] The invention relates to a hot gas device for providing hot gas for a coating device according to the preamble of claim 1, as well as to a coating device and a method for coating workpieces with a coating material according to the preamble of claim 12. Such a hot gas device and such a method for coating workpieces are known from document EP 0 169 188 A2.

[0002] In furniture and construction component manufacturing, workpieces are often coated on their surfaces for functional and aesthetic reasons. Especially in the case of panel-shaped workpieces, their narrow sides are also coated with a coating or edge banding material.

[0003] The coating material is typically applied to the workpiece using a functional layer provided on the workpiece or on the coating material. This functional layer can be an adhesive layer containing a thermally activated hot-melt adhesive, or a heat-activated layer that enables an adhesive-free bond to the workpiece. Before applying the coating material to the workpiece, such a functional layer must be activated. A hot-gas device can be provided for this purpose. This provides a hot gas that heats the functional layer to an activation temperature, for example, a melting temperature of the hot-melt adhesive or the heat-activated layer.

[0004] From DE 10 2011 015 898 A1 an edge coating device for applying a strip-shaped multi-layer edge material to narrow surfaces of a workpiece is known.

[0005] This edge material can be activated and attached to the narrow surfaces without the need for adhesive. The edge coating device comprises at least one feed device for the edge material and a pressure device that presses the edge material against the narrow surface of the workpiece. In the area of ​​the feed device and / or pressure device, an outlet for a hot gas is provided, which pressurizes the edge material and / or a heat-activatable layer of the edge material with the hot gas. To activate the edge material and / or the layer, the hot gas is heated to temperatures of up to 600°C. The workpieces to be coated and the edge material are usually made of wood and / or plastic.Due to the high temperatures of the hot gas and the radiated thermal energy of the components heated by the hot gas, workpieces or edge materials made of these materials can be damaged if the thermal load acts locally on the workpiece and / or the edge material for too long.

[0006] Application EP 0 169 188 A2 describes a method for gluing or bonding edgebanding material to panel-shaped workpieces. An adhesive, such as glue, containing a thinning agent is applied to the edgebanding material and / or the panel-shaped workpieces, then intermittently heated, for example, with warm air, and then the edgebanding material is pressed onto the panel-shaped workpieces. The adhesive applied to the edgebanding material and / or the panel-shaped workpieces is alternately heated and cooled before the edgebanding material is finally pressed onto the workpieces.

[0007] Furthermore, DE 20 2013 101 826 U1 and WO 93 / 06995 A1 are known.

[0008] The object of the present invention is to provide a hot gas device, a coating device with a hot gas device and a method for coating workpieces, by means of which a high functional and operational reliability is achieved when coating the workpieces.

[0009] This object is achieved according to the invention by a hot gas device for providing hot gas according to the features of claim 1, as well as by a coating device for coating workpieces with a coating material according to the features of claim 11, and by a method for coating workpieces with a coating material according to the features of claim 12. Particularly preferred embodiments of the invention are specified in the dependent claims.

[0010] The invention is based on the idea of ​​reducing the thermal load on a workpiece and / or a coating material due to the components of the coating device heated by the hot gas.

[0011] The hot gas is heated to temperatures above 400°C by an energy source of the hot gas device, in particular by a heat exchanger, and fed to the coating material and / or the workpiece. For this purpose, a deflection device is provided, which has at least one outlet opening for the hot gas in order to activate a functional layer provided on the workpiece and / or the coating material. At least the deflection device heats up, in particular in the region of the at least one outlet opening, to a temperature that essentially corresponds to the temperature of the hot gas. The deflection device can thus dissipate high levels of thermal radiation and convection heat.Since the ignition temperature of wood is between 280°C and 340°C and the melting temperature of a plastic or composite material can be significantly lower, there is a risk of damage or even ignition of the workpiece and / or coating material under certain operating conditions.

[0012] According to the invention, the hot gas device comprises a cooling device by means of which at least the workpiece and / or the coating material and / or the deflection device and / or the energy source can be cooled. Such cooling can reduce thermal stress on the workpiece and / or coating material, in particular due to the emitted thermal radiation and convection heat of the components of the hot gas device heated by the hot gas. Damage to or ignition of the workpiece and / or the coating material can be prevented in this way. Furthermore, it is provided that the cooling device comprises a control system by means of which the cooling and / or the supply of the hot gas can be controlled as a function of at least one defined operating state of the coating device.This control enables precisely controllable cooling, which only occurs in an operating state of the coating device that requires cooling of the workpiece and / or coating material.

[0013] In a preferred embodiment of the hot gas device, active cooling can be provided by the cooling device. This allows for effective cooling of the deflection device and / or the workpiece and / or the coating material and / or the energy source. In this way, the deflection device, the workpiece, the coating material and / or the energy source can be briefly cooled to a temperature that does not cause damage to the workpiece and / or the coating material.

[0014] In one embodiment of the hot gas device, it can be provided that this defined operating state of the coating device is formed at least by a delay in a relative movement between the workpiece to be coated and / or coating material and at least the deflection device. In particular, this operating state can be an interruption or termination of the relative movement. The delay in the relative movement can, in particular, represent a stop in the feed of the workpiece or the coating material. This can result in high local thermal stress on the workpiece or the coating material, which can lead to damage. By only activating the cooling system when the relative movement is delayed in this way, damage can be efficiently prevented on the one hand, and energy-saving cooling can be achieved on the other.

[0015] An advantageous development of the hot gas device provides that the cooling device has a cold gas source for providing a cold gas and comprises at least one cold gas guide path, which is connected to the deflection device and / or the energy source and / or at least one application device of the cooling device for supplying the cold gas. The cold gas source can ensure rapid and sufficient availability of the cold gas. The cold gas can be either cold air or any desired inert gas. Cold gas is understood to be a gas whose temperature is significantly lower than the temperature of the hot gas. For example, the cold gas can have a temperature corresponding to the ambient temperature, i.e., approximately 20°C.

[0016] An advantageous embodiment of the hot gas device provides that the cold gas can be supplied to the workpiece and / or the coating material for cooling through the at least one outlet opening of the deflection device or through at least one additional cold gas outlet opening of the deflection device. By supplying the cold gas through the at least one outlet opening of the deflection device, through which the hot gas can also be supplied to the functional layer, a simple design of the deflection device can be provided. If the cold gas is provided through the at least one additional cold gas outlet opening of the deflection device, a separate gas supply for the cold gas and the hot gas can also be provided.

[0017] In a preferred development of the hot gas device, it can be provided that the at least one outlet opening or the at least one cold gas outlet opening of the deflection device is directed toward the workpiece and / or coating material to be coated, and the cold gas can be supplied into a region between the workpiece and the deflection device and / or into a region between the coating material and the deflection device. This configuration allows the cold gas to be supplied specifically to areas where cooling is required. These areas to be cooled are, in particular, the surface of the workpiece and / or the coating material.

[0018] A preferred embodiment of the hot gas device provides for the deflection device to be provided adjacent to a pressing device of the coating device and preferably arranged between the workpiece to be coated and the coating material. This allows the activation of the functional layer to occur immediately before the coating material is pressed against the workpiece. Furthermore, by arranging the deflection device between the workpiece and the coating material, it is possible to supply the hot gas and / or the cold gas to both the coating material and the workpiece.

[0019] In a further development of the hot gas device, it can be provided that the at least one application device is assigned to the deflection device and has at least one outlet nozzle through which the cold gas can be supplied to the coating material and / or the workpiece and / or the deflection device for cooling. Preferably, at least one outlet nozzle of the application device is assigned to a side of the coating material that is opposite the functional layer on the coating material. The at least one application device can provide a flexible cooling arrangement in the coating device. The application device can preferably be provided where targeted cooling is required.In particular, the application device is arranged in such a way that, in the defined operating state of the coating device, effective cooling of the coating material is possible, preferably on a side of the coating material opposite the functional layer.

[0020] An advantageous embodiment of the hot gas device provides that the cold gas source comprises a compressed gas reservoir or is designed as a compressed gas reservoir, and preferably the compressed gas reservoir is connected to a compressed air supply. The compressed gas reservoir can be used to store the cold gas. The compressed air supply ensures a continuous supply of cold gas. The compressed air supply is preferably a local compressed air network. By extracting the pressurized cold gas from the compressed gas reservoir, a cooling effect can be utilized due to the expansion of the pressurized cold gas, thus cooling it further.

[0021] Preferably, the control of the cooling device can comprise at least one controllable valve, by which the provision of the cold gas and / or hot gas can be controlled. The at least one controllable valve can be moved between a closed position and an open position, thus enabling a controllable supply of the cold gas and / or hot gas depending on the defined operating state of the coating device.

[0022] The object is further achieved by a coating device for coating workpieces with a coating material, in particular for coating the narrow sides of plate-shaped workpieces with a narrow-surface coating material, wherein the workpieces are preferably formed at least partially from wood, wood-based materials, plastic, composite materials, or the like, wherein the coating device has a hot gas device for providing hot gas according to one of the previously described embodiments. Such a coating device can significantly reduce thermal stress on the workpiece and / or the coating material, in particular due to the emitted thermal radiation and convection heat of the components of the hot gas device heated by the hot gas, so that no damage to the workpiece and / or coating material occurs during the coating process.

[0023] Furthermore, the object is achieved by a method for coating workpieces with a coating material, in particular for coating narrow sides of plate-shaped workpieces with a narrow-surface coating material, with a coating device, wherein the coating device has a hot gas device for providing a hot gas and a cooling device for providing a cold gas, and the method comprises the steps: Providing the hot gas for activating a functional layer on the coating material and / or on the workpiece, pressing the coating material onto the workpiece with a pressing device, wherein the workpiece and / or coating material and the pressing device are moved relative to one another, and providing the cold gas for cooling at least the workpiece and / or coating material and / or a deflection device and / or energy source of the coating device, depending on a defined operating state of the coating device.

[0024] The invention, as well as further advantageous embodiments and developments thereof, are described and explained in more detail below with reference to the example shown in the drawing. The features shown in the description and the drawings can be used individually or in any combination according to the invention. They show: Fig. 1 shows a schematic representation of a coating device with a hot gas device.

[0025] A preferred embodiment of the present invention is described below with reference to the attached figure. Further modifications of individual features mentioned in this context can be combined with one another to form new preferred embodiments of the present invention.

[0026] Figure 1 shows a schematic representation of a coating device 1 for coating plate-shaped workpieces 2 with a coating material 3. In particular, the coating device 1 is intended for coating narrow sides 4 of plate-shaped workpieces 2 with a narrow surface coating material, also referred to as edge band or edge material.

[0027] The following explanations are generally based on the coating of a workpiece 2 with a coating material 3, although this also means the coating of a narrow side 4 of a workpiece 2 with a narrow surface coating material.

[0028] For coating, workpieces 2 are usually used that consist at least partially of wood, wood-based materials, plastic, composite materials, or the like, as used, for example, in furniture and construction element manufacturing. These can be a wide variety of workpieces, such as solid wood or chipboard, lightweight panels, sandwich panels, floorboards, profiles for profile wrapping, etc. However, the present invention is not limited to such workpieces.

[0029] The coating device 1 comprises a support 5 on which the workpiece 2 rests during coating. The support 5 can, in particular, enable a feed movement of the workpiece 2. A feed device 6 for the continuous supply of the coating material 3 is assigned to the support 5. The feed device 6 is arranged such that the coating material 3 is fed to the workpiece 2 at an acute angle relative to the feed direction of the workpiece 2.

[0030] The feed device 6 feeds the coating material 3 into the area of ​​a pressure device 7. The pressure device 7 comprises, for example, a rotatably mounted pressure roller 8. The pressure device 7 brings the coating material 3 into contact with the workpiece 2, with the feed movement of the workpiece 2 and the coating material 3 being coordinated with each other. To press the coating material 3 against the workpiece 2, several pressure rollers or another type of pressure device can be provided instead of the pressure roller 8.

[0031] The coating device 1 described above is from the field of continuous technology, in which the workpiece 2 is moved relative to the pressure device 7. In an alternative embodiment of the coating device 1, it can also be provided to fix the workpiece 2 during processing and to provide the pressure device 7 and, if applicable, the feed device 6 and / or a deflection device 9 described in more detail below, in a movable manner.

[0032] The coating material 3 consists of at least two layers, one of which, assigned to the workpiece 2, forms a functional layer. The functional layer can be, for example, an adhesive layer or a heat-activatable, adhesive-free layer. The at least one further layer of the coating material 3 forms, in particular, a decorative layer. In order to form a permanent bond with the workpiece 2, it is necessary to activate the functional layer, in particular to heat it to an activation temperature.

[0033] The functional layer is activated by a hot gas device 10. This hot gas device 10 has an energy source 11 that generates and supplies a hot gas. The hot gas can, in particular, be hot air. The energy source 11 is connected to the deflection device 9 via a hot gas guide path 12, so that the hot gas can be fed to the deflection device 9. The deflection device 9 has one or more outlet openings 13 through which the hot gas is directed towards the coating material 3. By exposing the coating material 3 to the heated hot gas, the thermal energy of the hot gas is provided to activate the functional layer. The functional layer can also be provided on the workpiece 2. In this case, the outlet openings 13 of the deflection device 9 are arranged such that the hot gas is directed towards the workpiece 2.

[0034] The at least one outlet opening 13 can be configured in a variety of ways. In particular, hole geometries arranged in series can be provided, wherein the outlet openings have a round hole geometry, a square hole geometry, or another type of free-form geometry. Likewise, the outlet opening 13 can be designed as a continuous opening, in particular in the form of a slot. Preferably, a plurality of outlet openings 13 are provided in several rows, wherein the outlet openings 13 can be of similar design or one or more outlet openings 13 can have different geometries.

[0035] The energy source 11 is designed in particular as a heat exchanger and heats the hot gas to temperatures of over 400°C. The components that come into contact with the hot gas, in particular the deflection device 9, therefore also reach temperatures in the range of over 400°C. As a result, these components, in particular the deflection device 9, radiate high thermal energy during coating. In order to achieve efficient energy input for activating the functional layer, the deflection device 9 is arranged in the immediate vicinity of the coating material 3 and / or workpiece 2. In particular, the deflection device 9 is arranged between the workpiece 2 and the coating material 3. The distance between the deflection device 9 and the coating material 3 and / or workpiece 2 is only a few millimeters.

[0036] In particular, if the feed movement of the workpiece 2 and / or the coating material 3 is interrupted or slowed down, a high level of thermal energy can be introduced locally into the workpiece 2 and / or the coating material 3 due to the thermal radiation and convection heat emanating from the heated deflection device 9. Since the ignition temperature of wood is in the range of 280°C to 340°C and the melting temperature of plastics can be significantly lower, if the feed movement is interrupted or slowed down, there is a risk of damage to the workpiece 2 and / or the coating material 3 or even the risk of ignition of the workpiece 2 and / or the coating material 3. .

[0037] To prevent this, the hot gas device 10 has a cooling device 14. By means of this cooling device 14, at least the deflection device 9 and / or the workpiece 2 and / or the coating material 3 and / or the energy source 11 can be cooled. In this case, active cooling of at least these components is provided by a cold gas. Cold gas is understood to be a gas whose temperature is considerably lower than the temperature of the hot gas. The cold gas can, for example, have a temperature in the range of the ambient temperature of approximately 20°C. The cold gas can, for example, be compressed air from a local compressed air network or even ambient air. Likewise, the cold gas can be any inert gas, for example argon or nitrogen.

[0038] The cold gas is provided by a cold gas source 15. According to Figure 1This cold gas source 15 is a compressed gas reservoir 16. The compressed gas reservoir 16 can be connected to a compressed air supply 17, which supplies the cold gas. The compressed air supply 17 can, for example, be a local compressed air network. By removing the cold gas from the compressed gas reservoir 16, the pressurized cold gas can be released, thus reducing the temperature of the cold gas. Likewise, a cooler (not shown in detail) can be provided, which cools the cold gas to the required cooling temperature. However, additional cooling of the cold gas is not absolutely necessary.

[0039] The cold gas source 15, in particular the compressed gas reservoir 16, is connected to the deflection device 9 via a cold gas guide path 18. This allows the cold gas to be supplied to the deflection device 9.

[0040] The deflection device 9 has at least one cold gas outlet opening 19 for providing the cold gas. One or more cold gas outlet openings 19 can be provided, wherein the number, design, and / or arrangement of the at least one cold gas outlet opening 19 can correspond to those of the previously described outlet opening 13 of the deflection device 9.

[0041] The at least one cold gas outlet opening 19 is directed toward the coated workpiece 2 and / or the coating material 3. This allows the cold gas to be supplied for cooling purposes to a region between the workpiece 2 and the deflection device 9 and / or to a region between the coating material 3 and the deflection device 9.

[0042] It can also be provided that the deflection device 9 does not have an additional cold gas outlet opening 19. In this case, the cold gas is supplied to the workpiece 2 and / or the coating material 3 via the outlet openings 13 of the deflection device 9. In this case, either the hot gas for activating the functional layer or the cold gas for cooling the workpiece 2 and / or coating material 3 and / or the deflection device 9 is provided via the outlet openings 13. It can also be provided that the cold gas is supplied to the deflection device 9 in addition to the hot gas in order to cool the deflection device 9.

[0043] To regulate the provision of the cold gas and / or hot gas, the cooling device 14 has a control system 20. This control system 20 comprises a controllable valve 21. This valve 21 is provided in the cold gas guide path 18 so that the provision of the cold gas by the valve 21 can be controlled. The valve 21 can be controlled between a closed position and an open position. While the hot gas for activating the functional layer is provided via the outlet openings 13 of the deflection device 9, the valve 21 is arranged in the closed position so that no cold gas is provided for cooling. If cooling is required due to the operating state of the coating device 1, the valve 21 is moved to the open position so that the cold gas is supplied to the deflection device 9 in addition to the hot gas.The valve 21 can be a unipolar valve which is moved into the open position when the voltage of the coating device 1 drops.

[0044] Such a controllable valve 21 can also be provided in the hot gas guide path 12, so that the supply of the hot gas can also be controlled. The valve 21 in the hot gas guide path 12 and in the cold gas guide path 18 can be arranged in opposite closed or open positions, so that either the hot gas or the cold gas is supplied to the deflection device 9.

[0045] The provision of the cold gas for cooling occurs depending on at least one defined operating state of the coating device 1 and is controlled by the controller 20. This defined operating state relates to at least a delay in the relative movement between the workpiece 2 to be coated and / or coating material 3 and at least the deflection device 9. The delay in the relative movement can be a slowing down, interruption, or termination of the feed movement, in particular a feed stop, of the workpiece 2 and / or the coating material 3. The supply of the cold gas in this operating state effects a cooling of the workpiece 2 and / or the coating material 3 and / or the deflection device 9. This prevents local thermal stress on the workpiece 2 and / or coating material 3 due to the thermal radiation and convection heat emitted by the heated deflection device 9.

[0046] The cold gas source 15 can be connected to the energy source 11 via a further cold gas guide path 18. A controllable valve 21 (not shown in detail) connected to the control system 20 can also be provided in this cold gas guide path 18. This allows the energy source 11 to be cooled by the cold gas alternatively or additionally in the defined operating state, i.e., the deceleration of the relative movement between the workpiece 2 to be coated and / or coating material 3 and at least the deflection device 9.

[0047] In a further development of the coating device 1, it can also be provided that at least one additional application device 22 for cooling is provided in the coating device 1, in particular for cooling the coating material 3. This application device 22 is connected to the cold gas source 15 via the cold gas guide path 18 or via a separate cold gas guide path.

[0048] According to Figure 1The application device 22 is arranged adjacent to the deflection device 9 and has at least one outlet nozzle 23 for providing the cold gas. The at least one outlet nozzle 23 is arranged in particular such that the cold gas can be supplied to the coating material 3 for cooling. In particular, the application device 22 is arranged such that the coating material 3 runs between the deflection device 9 and the application device 22. The cold gas exiting the outlet nozzle 23 can thus be supplied to a side of the coating material 3 that is opposite the functional layer on the coating material 3. Likewise, the application device 22 can be designed such that the cold gas can be supplied through one or more outlet nozzles 23 both on the side of the functional layer of the coating material 3 and on the side of the coating material 3 that is opposite the functional layer.

[0049] The application device 22 can have one or more outlet nozzles 23, wherein the number, design, and / or arrangement of the outlet nozzles 23 can correspond to the previously described outlet opening 13 of the deflection device 9. The provision of the cold gas via the application device 22 can be controlled by the controller 20 in the manner described above, depending on the defined operating state of the coating device 1. List of reference symbols

[0050] 1. Coating device 16. Compressed gas storage 2. workpiece 17. Compressed air supply 3. Coating material 18. Cold gas guide path 4. narrow side 19. Cold gas outlet opening 5. Edition 6. Feed device 20. control 7. Pressure device 21. valve 8. pressure roller 22. Application device 9. deflection device 23. Outlet nozzle 10. Hot gas device 11. Energy source 12. Hot gas guide path 13. Exit opening 14. Cooling device 15. Cold gas source

Claims

1. Hot gas device (10) for providing hot gas for a coating device (1) for coating workpieces (2) with a coating material (3), in particular for coating narrow sides (4) of planar workpieces (2) with a narrow surface coating material, said device comprising an energy source (11) for providing the hot gas and comprising at least one hot gas flow path (12) for supplying the hot gas to a deflection device (9), wherein the deflection device (9) has at least one outlet opening (13) in order to activate a functional layer provided on the coating material (3) and / or on the workpiece (2) by means of the hot gas, wherein a cooling device (14) is provided by means of which at least the workpiece (2) and / or coating material (3) and / or deflection device (9) and / or energy source (11) can be cooled, characterised in that the cooling device (14) has a regulation system (20) by means of which the cooling and / or the supply of the hot gas can be controlled depending on at least one defined operating state of the coating device (1).

2. Hot gas device according to claim 1, characterised in that active cooling is provided by means of the cooling device (14).

3. Hot gas device according to any of claims 1 to 2, characterised in that the defined operating state of the coating device (1) is formed by a delay of a relative movement between the workpiece (2) to be coated and / or coating material (3) and at least the deflection device (9), in particular an interruption or termination of the relative movement.

4. Hot gas device according to any of the preceding claims, characterised in that the cooling device (14) has a cold gas source (15) for providing a cold gas and comprises at least one cold gas flow path (18) which is connected to the deflection device (9) and / or energy source (11) and / or at least one application device (22) of the cooling device (14) in order to supply the cold gas.

5. Hot gas device according to claim 4, characterised in that the cold gas can be supplied to the workpiece (2) and / or coating material (3) for cooling through the at least one outlet opening (13) of the deflection device (9) or through at least one additional cold gas outlet opening (19) of the deflection device (9).

6. Hot gas device according to claim 5, characterised in that the at least one outlet opening (13) or the at least one cold gas outlet opening (19) of the deflection device (9) is directed towards the workpiece (2) to be coated and / or coating material (3) and the cold gas can be supplied into a region between the workpiece (2) and the deflection device (9) and / or into a region between the coating material (3) and the deflection device (9).

7. Hot gas device according to any of the preceding claims, characterised in that the deflection device (9) is assigned to a pressing device (7) of the coating device (1) and is preferably arranged between the workpiece (2) to be coated and the coating material (3).

8. Hot gas device according to claim 4, characterised in that the at least one application device (22) is assigned to the deflection device (9) and has at least one outlet nozzle (23) through which the cold gas can be supplied to the coating material (3) and / or workpiece (2) and / or deflection device (9) for cooling, wherein preferably the at least one outlet nozzle (23) is assigned to a side of the coating material (3) that is opposite the functional layer on the coating material (3).

9. Hot gas device according to any of claims 4 to 8, characterised in that the cold gas source (15) comprises a compressed gas store (16) or is designed as a compressed gas store (16) and preferably the compressed gas store (16) is connected to a compressed air supply (17).

10. Hot gas device according to any of claims 1 to 2, characterised in that the regulation system (20) of the cooling device (14) has at least one controllable valve (21) by means of which the provision of the cold gas and / or hot gas can be controlled.

11. Coating device (1) for coating workpieces (2) with a coating material (3), in particular for coating narrow sides (4) of planar workpieces (2) with a narrow surface coating material, wherein the workpieces (2) are preferably made at least in part of wood, wood-based materials, plastics material, composite materials or the like, characterised in that a hot gas device (10) is provided for providing hot gas according to any of claims 1 to 10.

12. Method for coating workpieces (2) with a coating material (3), in particular for coating narrow sides (4) of planar workpieces (2) with a narrow surface coating material, by means of a coating device (1) which has a hot gas device (10) for providing a hot gas and a cooling device (14) for providing a cold gas, said method comprising the steps of: - providing the hot gas in order to activate a functional layer on the coating material (2) and / or workpiece (2), - pressing the coating material (3) onto the workpiece (2) by means of a pressing device (7), wherein the workpiece (2) and / or coating material (3) and the pressing device (7) are moved relative to one another and characterised in that the method also comprises the following: - providing the cold gas in order to cool at least the workpiece (2) and / or coating material (3) and / or a deflection device (9) and / or energy source (11) of the coating device (1), depending on a defined operating state of the coating device (1).

13. Method according to claim 12, characterised in that the defined operating state of the coating device (1) is formed by a delay of the relative movement between the workpiece (2) and / or coating material (3) and the pressing device (7), in particular by an interruption or termination of the relative movement.

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