Cleaning laser device and method for removing coating containing asbestos material from metal surface

Abstract

The invention relates to a cleaning laser device (1) and a method for removing a coating (3) containing an asbestos material (2) from a metal surface (4).

Description

Technical Field

[0001] The present invention relates to a cleaning laser device for removing a coating containing asbestos material from a metal surface during a cleaning process.

[0002] The invention also relates to a method for removing a coating containing asbestos material from a metal surface during a cleaning process, wherein during the cleaning process the layer average value of the asbestos fiber concentration in the workplace is less than 10,000 asbestos fibers / m3 (abbreviation F / m 3 ) of the permitted concentration of asbestos fibers. Background Art

[0003] According to Annex VI to Regulation (EC) No 1272 / 2008 and Category 1A of the Dangerous Substances Ordinance (GefStoffV), asbestos is a carcinogenic hazardous substance and its use is generally prohibited. The only exceptions are demolition, renovation and maintenance work in accordance with Annex II, Article 1 of the GefStoffV.

[0004] Silicates with a fibrous structure are called asbestos, namely actinolite, amosite, anthophyllite, chrysotile, crocidolite and tremolite.

[0005] Asbestos-containing materials are mixtures and products that contain asbestos and in which activities may result in the formation or release of fibrous dust.

[0006] The March 31, 2022 amendment to TRGS 519 "Technical Rules for Hazardous Substances" "Asbestos removal, renovation or maintenance work" summarizes the protective measures required by Annex I to GefStoffV, Article 2.4, and the organizational requirements for permitted activities involving asbestos or asbestos-containing materials. All references to TRGS 519 below refer to the amendment. Protecting employees generally also ensures the protection of third parties and the environment.

[0007] When carrying out activities involving asbestos, it is generally assumed that exposure to high levels of asbestos fibres will occur (worst case scenario) and therefore all requirements of Regulation 2.4 of Annex I to GefStoff V must generally be met. This relates in particular to:

[0008] - Possess certain qualifications / expertise as specified in TRGS 519

[0009] - Regularly participate in occupational health examinations

[0010] - Comply with employment restrictions

[0011] - Special construction site facilities such as personnel and material blockade

[0012] -Technical ventilation measures, negative pressure maintenance

[0013] - Wear personal protective equipment

[0014] For activities involving minor exposure to asbestos, Article 2.1 of Annex I to GefStoff V allows for exemptions from the above requirements.

[0015] In combination with the carcinogen risk concept of TRGS 910, if it has been proven that the average value of asbestos fiber concentration in the workplace is lower than the permissible concentration of 10,000 asbestos fibers / cubic meter, it is a low exposure or low risk activity.

[0016] According to TRGS 519, § 2.9, "low-emission processes" are activities that have been tested and certified as low-exposure by the authorities or statutory accident insurance bodies. Low-emission processes are based on standardized work procedures and have a safe lower limit deviation of asbestos concentration that is below the permissible asbestos concentration.

[0017] If the limit values ​​for other hazardous substances, such as mineral dust, quartz dust, tar-based emissions (which may also be released during the process), are not met, appropriate protective measures must be specified in the process description.

[0018] For the statutory accident insurance institutions, the certification of low-emission processes according to TRGS 519 is carried out by the "Construction Department" of the German Statutory Accident Insurance (DGUV) under the leadership of the DGUV "Low Emission Working Group" "Low-Emission Processes According to TRGS 519 for Activities Involving Asbestos Materials". Summary of the invention

[0019] In view of this, the object of the present invention is to provide a cleaning laser device and a method for removing coatings containing asbestos materials from metal surfaces, which cleaning laser device is suitable for carrying out the method, in particular a low-emission process according to TRGS 519 standard.

[0020] In order to achieve the above-mentioned object, the present invention proposes a cleaning laser device of the aforementioned type, which has a cleaning laser and an extraction device, wherein the cleaning laser has a laser optical device for emitting laser light, and the extraction device has an extraction port, wherein during the cleaning process, the laser light emitted by the laser optical device can remove the coating on the metal surface, thereby at least partially releasing the asbestos-containing material, wherein the extraction port is arranged adjacent to the cleaning laser, so that the removed coating and the released asbestos-containing material can be sucked into the extraction device through the extraction port together. Here, the removable coating refers to the coating on the metal surface evaporated and / or ablated and / or stripped by the laser emitted by the laser optical device. Advantageously, the cleaning laser device provides an efficient method with the lowest concentration of asbestos fiber release, which is used to remove the coating containing asbestos material from the metal surface during the cleaning process, so that the activities in the working area are only exposed to low concentrations of asbestos. The cleaning laser device can even facilitate the implementation of low-emission processes that comply with the TRGS 519 standard.

[0021] Preferably, the extraction unit should also be certified for asbestos according to TRGS 519.

[0022] According to TRGS 910, low-exposure activities refer to low-risk work with a permissible asbestos concentration of less than 10,000 asbestos fibers / cubic meter (for determination of asbestos fiber concentration, please refer to Article 4.3, paragraph 1, of the TRGS 519 standard, as amended on March 31, 2022).

[0023] If such activities are carried out in a building, it must be demonstrated that the indoor air asbestos fiber concentration does not exceed 500F / m 3 , Poisson upper limit does not exceed 1000F / m 3 (determined according to VDI 3492).

[0024] The term "low-emission processes" covers activities that comply with Section 2.8 of TRGS 519, which have been tested and certified by the authorities or statutory accident insurance institutions. The basis for the respective tests is the evaluation criteria drawn up by the Institute for Occupational Safety and Health of the German Statutory Accident Insurance (IFA). The procedure for certification by the statutory accident insurance institutions is published in BGI 664 with the latest supplement (see www.dguv.de, for the determination of the asbestos fiber concentration as part of the test procedure, see Section 4.3, Paragraph 2, TRGS 519).

[0025] In an advantageous cleaning laser arrangement in this respect, the cleaning laser is designed as an Nd:YAG solid-state laser.

[0026] According to an additional advantageous embodiment of the cleaning laser device, the power density of the cleaning laser is in the range of several hundred kilowatts per pulse power. Advantageously, the single pulse power is greater than 200 kW, preferably greater than 500 kW, more preferably greater than 1000 kW. The high power density makes the cleaning work more economical.

[0027] According to another advantageous development of the cleaning laser device, the extraction device comprises a collecting device for collecting the extracted asbestos-containing material. The asbestos fibers released and extracted by laser ablation can be collected separately by means of a collecting device designed, for example, in the manner of a vacuum bag. Laser ablation (also known as laser evaporation) is the removal of surface coatings by irradiating a surface with a pulsed laser (also known as laser radiation). The high power density of the laser used in this process leads to rapid heating of the surface and the formation of a plasma.

[0028] In this regard, the collecting device of the extraction device is a replaceable collecting device. More preferably, the collecting device can be closed before replacement so that asbestos fibers are not released during replacement. A replaceable collecting device makes it easier to continue working and handle asbestos fibers as required without wasting too much time.

[0029] In addition, the extraction device has a filter device, which is advantageously designed as a HEPA filter. The removed coating and the released asbestos fibers can be purified from the extracted air by the filter device. A HEPA filter (High Efficiency-Particulate Air filter) is a particle filter suitable for filtering out more than 99.9% of all dust particles larger than 0.1 to 0.3 microns (μm), such as viruses, inhalable dust, mite eggs and excrement, pollen, smoke particles, asbestos, bacteria, various toxic dusts and aerosols in the air.

[0030] Preferably, the filter device further comprises a filter shaker, through which asbestos fibers accumulated on the filter device can be removed from the filter device and collected, for example, in a collecting device. Advantageously, the filter shaker is designed as a manually mechanically operated filter shaker.

[0031] The cleaning laser device advantageously has an extraction device, the extraction power of which is greater than 3 kW, preferably greater than 5 kW, and more preferably greater than 7 kW. This magnitude of extraction power can ensure the safe extraction of asbestos fibers during the cleaning process. Preferably, the extraction device is designed as a vacuum suction mechanism. The vacuum negative pressure in the extraction device can ensure that the extracted asbestos fibers remain in the collection device of the extraction device.

[0032] According to an additional advantageous embodiment of the cleaning laser device, the cleaning laser device has a housing which is designed to keep the cleaning laser free of asbestos during the cleaning process. In this respect, the housing is designed as a shell. In addition, the housing can be made of a tubular film of a certain thickness, advantageously of a 100 mm thick LDPE tubular film. Other tubular films with a thickness in the range of 50 μm to 250 μm are also conceivable, for example. Preferably, the cleaning laser is not exposed to asbestos by the housing, and such a cleaning laser can still be used for other applications outside the asbestos field.

[0033] Furthermore, the cleaning laser device comprises a control device with a regulating function, which is advantageously configured to automatically adapt the extraction flow of the extraction device according to the parameter settings of the cleaning laser. Thus, the use of the extraction device has the advantage that, for example, the higher the energy density and the shorter the pulse length, the more asbestos fibers are released. In particular, for example, the higher the power density and / or the shorter the pulse length, the stronger the suction force. The extraction flow of the extraction device can be automatically optimized and adjusted by the control device.

[0034] Advantageously, the control device is configured to trigger subsequent operation of the extraction device after the cleaning process has ended. This ensures that the extraction device continues to extract the work area for a period of time after the cleaning process has stopped, thereby extracting any asbestos fibers that may still be released but not yet extracted.

[0035] According to an advantageous embodiment of the cleaning laser device, the cleaning device has a holding device on which the cleaning laser can be arranged so that the cleaning laser always maintains the same distance from the coated metal surface. If the distance between the cleaning laser and the metal surface remains constant, only the parameters of the cleaning laser need to be set before the cleaning process. In addition, it is easier to control the feed rate of the cleaning device during the cleaning process. In addition, the workload of the operator is reduced. Advantageously, the holding device is designed as an industrial robot.

[0036] In addition, in order to achieve the above-mentioned object, the present invention proposes a method of the aforementioned type, wherein the coating is removed by a cleaning laser device, the cleaning laser device having a cleaning laser and an extraction device, the cleaning laser having a laser optical device for emitting laser light, and the extraction device having an extraction port. The exposure level to asbestos fibers is determined by measuring the workplace according to standards TRGS 402 and DIN EN 689. The measurement results are described as the average asbestos fiber concentration (layer average) for an 8-hour shift. The removal of the coating by means of a cleaning laser device provides an efficient method with a minimum concentration of asbestos fibers released for the removal of coatings containing asbestos materials from metal surfaces during the cleaning process, so that activities in the work area are exposed to only low concentrations of asbestos. The method advantageous in this respect belongs to a low-emission process according to TRGS 519.

[0037] According to an additional advantageous embodiment of the method, during the cleaning process, the removed coating is sucked together with the released asbestos-containing material via the extraction opening into the extraction device. This ensures that the asbestos fibers are only released at a low asbestos fiber concentration.

[0038] According to a further advantageous method, the cleaning laser is designed as a Nd:YAG solid-state laser and emits invisible infrared laser light, also known as laser radiation, preferably with an emission wavelength of 1064 nm. Surprisingly, it has been found that a Nd:YAG solid-state laser with an emission wavelength of 1064 nm provides the best cleaning results for coatings containing asbestos materials.

[0039] In an additional preferred improvement of the method, the power density of the cleaning laser device is a single pulse power in the range of 200 kW to 1000 kW and a pulse length in the range of 50 ns to 200 ns. The combination of power density and pulse length in the above range will produce significant heating of the surface during the pulse. The power density is preferably several hundred kilowatts, in particular 200 kW to 500 kW. Due to the relatively slow rate of heat conduction into the coating volume, the rapidly introduced heat is generally not dissipated. As a result, the surface of the coating containing asbestos material will be heated to enter a plasma state. This plasma will become so dense that it absorbs most of the laser light, thereby protecting the underlying surface from further heating. The cleaning laser device can optimize the removal of the coating.

[0040] According to another advantageous method, the extraction device has a filter device, which also has a filter shaker suitable for cleaning the filter device. This ensures that the extracted coating and asbestos material is always filtered out in an optimal manner, for example, the filter device is not clogged with asbestos fibers.

[0041] According to an additional preferred embodiment of the method, the cleaning laser device comprises a control device with a regulating function, which is configured to automatically adapt the extraction flow of the extraction device according to the parameter settings of the cleaning laser. Therefore, the use of the extraction device has the advantage that, for example, the higher the energy density and the shorter the pulse length, the more asbestos fibers are released by laser ablation during the cleaning process. In particular, for example, the higher the power density and / or the shorter the pulse length, the stronger the suction force. The extraction flow of the extraction device can be automatically adapted by the control device so that it is optimally adapted to the laser ablation.

[0042] Advantageously, the control device is configured to trigger a subsequent operation of the extraction device after the cleaning process has ended. This ensures that the extraction device continues to extract the work area for a period of time after the cleaning process has stopped, thereby extracting any asbestos fibers that may still be released but not yet extracted. In this regard, the subsequent operation lasts from 30 seconds to 10 minutes.

[0043] Furthermore, according to an additional embodiment of the preferred method, the cleaning laser device comprises a control device with a regulating function, and the control device is configured to activate the extraction device when the cleaning laser is turned on. In this way, it is ensured that the extraction device is turned on during the cleaning process using the cleaning laser, so that the removed coating is always extracted together with the asbestos-containing material. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention is described in detail below in conjunction with the accompanying drawings, in which:

[0045] Figure 1 A schematic diagram of an embodiment of a preferred cleaning device is shown. DETAILED DESCRIPTION

[0046] Figure 1 A schematic diagram of an exemplary embodiment of a cleaning device 1 for removing a coating 3 containing asbestos material 2 from a metal surface 4 during a cleaning process is shown.

[0047] Silicates with a fibrous structure are called asbestos, namely actinolite, amosite, anthophyllite, chrysotile, crocidolite and tremolite.

[0048] Asbestos-containing materials2 are mixtures and products containing asbestos and in which activities may result in the formation or release of fibrous dust.

[0049] The cleaning laser device 1 comprises a cleaning laser 5 having a laser optical device 7 for emitting laser light 6 and an extraction device 9 having an extraction port 8. The extraction port 8 is arranged adjacent to the cleaning laser 5, so that during the cleaning process, the coating 3 removed by the laser light 6 emitted by the laser optical device 7 is sucked into the extraction device 9 through the extraction port 8 together with the at least partially released asbestos material 2.

[0050] In the method, the coating 3 is removed from the metal surface 4 by irradiating the metal surface 4 with a pulsed laser 6 to form a plasma. Advantageously, the cleaning laser 5 is designed as a Nd:YAG solid-state laser 10. The Nd:YAG solid-state laser 10 emits invisible infrared radiation with a wavelength of 1064 nm. In principle, other cleaning lasers 5 with shorter emission wavelengths are also conceivable, but these lasers are generally not very efficient when removing coatings 3 containing asbestos materials 2.

[0051] In order to remove the coating 3 with a more economical removal rate, a high power density in the range of hundreds of kilowatts is required for a single pulse power. The cleaning laser 5 used in the embodiment shown in this figure is a CL1000 laser cleaning system produced by Clean Lasersysteme GmbH, equipped with an OSH80 laser optical device. The nominal power of the CL1000 laser cleaning system is 1000W, and the single pulse power density of the cleaning laser 5 used in this embodiment is several hundred kilowatts.

[0052] In a non-implemented embodiment, a handheld OSH80 or EffiScan type optical device and a quick-change optical fiber are used. The single pulse power density used is greater than 200 kW, especially greater than 500 kW.

[0053] The pulse length is typically in the range of 50 ns to 200 ns. In this embodiment, a pulse length of the order of 100 ns is selected so that the surface 4 can be heated significantly during the pulse. Due to the relatively slow conduction of heat into the volume of the cladding 4, the rapidly introduced heat is usually not dissipated, so that the cladding 3 is heated to such an extent that it enters a plasma state. This plasma can become so dense that it absorbs most of the laser light 6, thereby protecting the underlying surface from further heating.

[0054] The exhaust device 9 is preferably designed as a vacuum suction mechanism. In this embodiment, the exhaust device 9 adopts a DG50EXP asbestos exhaust system produced by Delfin Industrial Vacuums Company and conforming to TRGS 519 standard asbestos certification, and its suction power is 5kW.

[0055] In other embodiments, a suction power of 3 kW or 7 kW is used.

[0056] In addition, the extraction device 9 has a collecting device 11 for collecting the extracted asbestos-containing material 2. The collecting device 11 of the extraction device 9 is preferably a replaceable collecting device. In addition, the collecting device is designed to be dust-proof and closed during replacement, thereby preventing the asbestos-containing material 2 from escaping.

[0057] Furthermore, the extraction device 9 has a filter device 12 which is advantageously designed as a HEPA filter 13 of filter grade H14. The filter device 12 is additionally provided with a filter shaker 14 which mechanically cleans the filter device 12 by manual operation.

[0058] In the embodiment shown, the cleaning laser device 1 includes an optional cladding 15. The cladding 15 is designed to prevent the cleaning laser 5 from contacting the asbestos-containing material 2 during the cleaning process, that is, to maintain an asbestos-free state. The cladding 15 can be selectively designed as, for example, a housing 16, as shown in this embodiment, or as a tubular film. When a tubular film is used, it is preferred to use an LDPE tubular film with a thickness of 50 μm to 200 μm, particularly preferably 100 μm, and a sufficient length.

[0059] In this embodiment, the laser cleaning device 1 additionally comprises a control device 17 with a regulating function. The control device 17 is particularly configured to automatically adapt the extraction flow of the extraction device 9 to the parameter settings of the cleaning laser 5, and / or to trigger the subsequent operation of the extraction device 9 after the cleaning process is completed, and / or to start the extraction device 9 when the cleaning laser 5 is turned on. If the cleaning laser device does not have a control device 17, the extraction device 9 should always be set to the maximum suction power.

[0060] Furthermore, the cleaning device 1 has a holding device 18 on which the cleaning laser 5 can be arranged. Advantageously, the holding device 18 is a movable frame or, as in the present embodiment, an industrial robot 19 having a plurality of mechanical arms 23 that can be moved relative to one another, thereby ensuring that the laser optics 6 of the cleaning laser 5 always maintain the same distance 20 from the metal surface 4 with the coating 3. In addition, a certain feed amount 22 of the cleaning laser 5 can be ensured by the holding device 18. This significantly improves the quality of the laser cleaning compared to a handheld cleaning laser 5.

[0061] In a method for removing a coating 3 containing asbestos material 2 from a metal surface 4 during a cleaning process, during the cleaning process, the layer average value of the asbestos fiber concentration in the workplace 21 is less than 10000F / m 3 The invention discloses a method for removing the coating 3 by a cleaning laser device 5, wherein the coating 3 is removed by a cleaning laser device 5, the cleaning laser device 5 comprising a cleaning laser 5 having a laser optical device 7 for emitting laser light 6, and an extraction device 9 having an extraction port 8. The extraction device 9 is suitable for sucking the coating 3 evaporated during the cleaning process together with the released asbestos material 2 through the extraction port 8 into the extraction device 9. Advantageously, the method belongs to a low-emission process in accordance with the TRGS 519 standard.

[0062] According to TRGS 910, low exposure activities refer to activities where the permissible concentration of asbestos fibers is less than 10,000 asbestos fibers / m3 (abbreviated as F / m 3 ) (for determination of asbestos fiber concentration, see TRGS 519, clause 4.3, paragraph 1). If such activities are carried out in a building, it must be demonstrated that the asbestos fiber concentration in the indoor air does not exceed 500F / m 3 , Poisson upper limit does not exceed 1000F / m 3 (determined according to VDI 3492).

[0063] The term "low-emission processes" covers activities that comply with Section 2.8 of TRGS 519, which have been tested and certified by the authorities or statutory accident insurance institutions. The basis for the respective tests is the evaluation criteria drawn up by the Institute for Occupational Safety and Health of the German Statutory Accident Insurance (IFA). The procedure for certification by the statutory accident insurance institutions is published in BGI 664 with the latest supplement (see www.dguv.de, for the determination of the asbestos fiber concentration as part of the test procedure, see Section 4.3, Paragraph 2, TRGS 519).

[0064] Preferably, the cleaning laser device 1 comprises a cleaning laser 5 which is designed as a Nd:YAG solid-state laser 10 and emits invisible infrared radiation, advantageously infrared laser light 6 with a wavelength of 1064 nm, also known as infrared radiation.

[0065] The power density of the cleaning laser device 1, in particular the single pulse power, is in the range of 200 kW to 2000 kW, and the pulse length is in the range of 50 ns to 200 ns. Particularly advantageous are power densities of several hundred kilowatts, in particular 200 kW to 500 kW, and pulse lengths in the range of 80 ns to 150 ns.

[0066] The extraction device 9 comprises a filter device 12 which also has a filter shaker 14 suitable for cleaning the filter device 12. The filter device 12 can be cleaned manually or controlled by the control device as required. For example, such cleaning can be triggered when the pressure loss occurring through the filter device 12 rises above a threshold value, in particular the pressure loss can be detected by differential pressure measurement.

[0067] Finally, the cleaning laser device 1 comprises a control device 17 with a regulating function, which is configured to automatically adapt the extraction flow of the extraction device 9 to the parameter settings of the cleaning laser 5, and / or to trigger the subsequent operation of the extraction device 9 after the cleaning process is completed (the subsequent operation advantageously lasts 30 seconds to 10 minutes), and / or to start the extraction device 9 when the cleaning laser 5 is turned on.

Claims

1. A cleaning laser device (1) for removing a coating (3) containing asbestos material (2) from a metal surface (4) during a cleaning process, characterized in that: The cleaning laser device (1) comprises a cleaning laser (5) and an exhaust device (9), wherein the cleaning laser (5) has a laser optical device (7) for emitting laser light (6), and the exhaust device (9) has an exhaust port (8), wherein during the cleaning process, the laser light (6) emitted by the laser optical device (7) can remove the coating (3) on the metal surface (4), thereby at least partially releasing the asbestos-containing material (2), wherein the exhaust port (8) is arranged adjacent to the cleaning laser (5), so that the removed coating (3) and the released asbestos-containing material (2) can be sucked into the exhaust device (9) together through the exhaust port (8).

2. The cleaning laser device (1) according to claim 1, characterized in that: The cleaning laser (5) is designed as a Nd:YAG solid laser (10).

3. The cleaning laser device (1) according to claim 1 or 2, characterized in that: The power density of the cleaning laser (5) is a single pulse power greater than 200 kW, preferably greater than 500 kW, and more preferably greater than 1000 kW.

4. The cleaning laser device (1) according to any one of the preceding claims, characterized in that The extraction device (9) has a collecting device (11) for the extracted asbestos-containing material (2).

5. The cleaning laser device (1) according to claim 4, characterized in that: The collecting device (11) of the extraction device (9) is a replaceable collecting device.

6. The cleaning laser device (1) according to any one of the preceding claims, characterized in that The extraction device (9) has a filter device (12), wherein the filter device (12) is advantageously designed as a HEPA filter (13).

7. The cleaning laser device (1) according to claim 6, characterized in that The filter device (12) has a filter shaker (14). Advantageously, the filter shaker (14) is designed as a manually mechanically operated filter shaker (14).

8. The cleaning laser device (1) according to any one of the preceding claims, characterized in that The exhaust device (9) is designed as a vacuum suction mechanism.

9. The cleaning laser device (1) according to any one of the preceding claims, characterized in that The suction power of the suction device (9) is greater than 3 kW, preferably greater than 5 kW, and more preferably greater than 7 kW.

10. The cleaning laser device (1) according to any one of the preceding claims, characterized in that The cleaning laser device (1) has a housing (15), wherein the housing (15) is designed to keep the cleaning laser (5) in an asbestos-free state during the cleaning process.

11. The cleaning laser device (1) according to claim 10, characterized in that The enclosure (15) is designed as a shell (16) or a tubular film.

12. The cleaning laser device (1) according to any one of the preceding claims, characterized in that The cleaning laser device (1) comprises a control device (17) with a regulating function. Advantageously, the control device (17) is configured to automatically adjust the extraction flow of the extraction device (9) according to the parameter setting of the cleaning laser (5).

13. The cleaning laser device (1) according to claim 12, characterized in that The control device (17) is configured to trigger the subsequent operation of the extraction device (9) after the cleaning process is completed.

14. The cleaning laser device (1) according to any one of the preceding claims, characterized in that The cleaning laser device (1) has a holding device (18), on which the cleaning laser (5) can be arranged so that the cleaning laser (5) always maintains the same distance (20) from the metal surface (4) having the coating (3).

15. A method for removing a coating (3) containing asbestos material (2) from a metal surface (4) during a cleaning process, wherein: During cleaning, the average value of asbestos fiber concentration in the workplace (21) is less than 10000F / m 3 The permissible concentration of asbestos fibers is characterized in that: The coating (3) is removed by a cleaning laser device (1), the cleaning laser device comprising a cleaning laser (5) having a laser optical device (7) for emitting laser light (6) and an extraction device (9) having an extraction port (8).

16. The method according to claim 15, characterized in that The method described is a low-emission process in accordance with the TRGS 519 amendment of 31 March 2022.

17. The method according to claim 15 or 16, characterized in that During the cleaning process, the removed coating (3) together with the released asbestos-containing material (2) is sucked through the suction opening (8) into the suction device (9).

18. The method according to any one of claims 15 to 17, characterized in that The cleaning laser (5) is designed as a Nd:YAG solid laser (10) and emits invisible infrared laser (6).

19. The method according to claim 18, characterized in that The infrared laser (6) emits a wavelength of 1064 nm.

20. The method according to any one of claims 15 to 19, characterized in that The power density of the cleaning laser device (1) is in the range of 200 kW to 2000 kW for a single pulse power, and in the range of 50 ns to 200 ns for a pulse length.

21. The method according to any one of claims 15 to 20, characterized in that The extraction device (9) comprises a filter device (12), wherein the filter device (12) also has a filter shaker (14) suitable for cleaning the filter device (12).

22. The method according to any one of claims 15 to 21, characterized in that The cleaning laser device (1) comprises a control device (17) with a regulating function, wherein the control device (17) is configured to automatically adjust the extraction flow of the extraction device (9) according to the parameter setting of the cleaning laser (5).

23. The method according to any one of claims 15 to 22, characterized in that The cleaning laser device (1) comprises a control device (17) with a regulating function, wherein the control device (17) is configured to trigger the subsequent operation of the exhaust device (9) after the cleaning process is completed.

24. The method according to claim 23, characterized in that The subsequent run lasts from 30 seconds to 10 minutes.

25. The method according to any one of claims 15 to 24, characterized in that The cleaning laser device (1) comprises a control device (17) with a regulating function, wherein the control device (17) is configured to start the extraction device (9) when the cleaning laser (5) is turned on.

Images