Cleaning Laser Device and Method for Removing a Coating Layer Having an Asbestos-Containing Material from the Surface of a Metal

Abstract

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

Description

Technical Field

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

[0002] Furthermore, the present invention relates to a method for removing a coating layer having an asbestos-containing material from the surface of a metal during a cleaning process. In this cleaning process, the asbestos fiber concentration in the workplace is less than 10,000 asbestos fibers / m 3 (F / m 3 ) which is the asbestos fiber acceptance concentration of the work shift average.

Background Art

[0003] Asbestos is one of the carcinogenic harmful substances compliant with Annex VI of Regulation (EC) No. 1272 / 2008 and the Hazardous Substances Regulation (GefStoffV) (Category 1A), and its use is generally prohibited. Exceptions to this are demolition work, renovation work, and maintenance work compliant with the Hazardous Substances Regulation, Annex II, No. 1.

[0004] Here, the following silicates having a fibrous structure, namely, actinolite, amosite, anthophyllite, chrysotile, crocidolite, and tremolite are called asbestos.

[0005] An asbestos-containing material is a mixture and product containing asbestos, and in the case of this mixture and product, the implementation of work may lead to the generation or release of fibrous dust.

[0006] The technical rules of TRGS 519 "Asbestos: Removal, Repair and Maintenance Work" regarding hazardous substances in the version of March 31, 2022 summarize and specify the organizational requirements for the mandatory protective measures and permitted activities regarding asbestos or asbestos-containing substances, which comply with Appendix I, No. 2.4 of the Hazardous Substances Regulations. When TRGS 519 is referred to, in the following, this version of March 31, 2022 is always referred to. Generally, by protecting employees, the protection of third parties and the environment is also ensured.

[0007] Basically, when dealing with asbestos, a high level of exposure to asbestos fibers is assumed (in the worst case), and as a result, generally, all requirements of the Hazardous Substances Regulations, Appendix I, No. 2.4 must be implemented. In particular, this concerns - the existence of specific qualifications / expertise in compliance with TRGS 519 - the regular implementation of occupational health measures - the compliance with employment restrictions - special construction site facilities such as lock rooms for personnel and materials - technical ventilation measures, maintaining negative pressure - the wearing of personal protective equipment It is related to Appendix I, No. 2.1 of the Hazardous Substances Regulations allows deviations from these requirements for activities involving asbestos that result in low exposure.

[0008] In relation to the risk concept for carcinogens in TRGS 910, if it is proven that the average asbestos fiber concentration in the workplace during work shifts is below the asbestos fiber tolerance concentration of 10,000 asbestos fibers / m 3 there is low exposure or low-risk activity.

[0009] The "low-emission method" in compliance with TRGS 519, No. 2.9 is an activity with low exposure, which has been inspected and approved by the authorities or the statutory accident insurance institutions. The low-emission method is based on standard operating procedures that have been proven to safely keep the asbestos tolerance concentration of asbestos below the limit for approval.

[0010] If the limit values for other harmful substances that may also be emitted as a result of the process, such as mineral dust, quartz-containing dust, emissions from tar-based substances, etc., are not complied with, appropriate protective measures shall be specified in the procedure manual.

[0011] Regarding the statutory accident insurance institutions, the "Construction" department of the German statutory accident insurance (DGUV) conducts inspections and approvals of low-emission methods in accordance with TRGS 519 under the jurisdiction of the DGUV working group "Low-emission methods compliant with TRGS 519 for activities related to asbestos-containing materials".

Summary of the Invention

Problems to be Solved by the Invention

[0012] Therefore, an object of the present invention is to provide a cleaning laser device and method for removing a coating layer having an asbestos-containing material from the surface of a metal, and this cleaning laser device is particularly suitable for implementing this method as a low-emission method compliant with TRGS519.

Means for Solving the Problems

[0013] This problem is solved by a cleaning laser device comprising a cleaning laser having a laser optical system for emitting laser light and a suction device having a suction opening, wherein the coating layer on the surface of the metal can be removed by the laser light emitted from the laser optical system during the cleaning process, and as a result, the asbestos-containing material can be at least partially ablated. The suction opening is arranged adjacent to the cleaning laser, and as a result, the removed coating layer can be sucked through the suction opening into the suction device together with the emitted asbestos-containing material. Here, the ablatable coating layer means that the laser light emitted by the laser optical system evaporates and / or burns and / or explodes the coating layer on the surface of the metal. Advantageously, the cleaning laser device provides a very efficient method for ablating the minimum concentration of asbestos fibers for removing the coating layer containing asbestos-containing material from the surface of the metal during the cleaning process, so that the activities in the work area are only exposed to a low level of asbestos exposure. Preferably, the cleaning laser device also enables a low-emission method compliant with TRGS519.

[0014] Preferably, the suction device should have a TRGS519 asbestos certification.

[0015] Low-exposure activities are low-risk operations in accordance with TRGS910, in which the asbestos tolerance concentration is below 10,000 asbestos fibers / m 3 (see TRGS519, Edition of March 31, 2022, No. 4.3, paragraph 1 for determining the asbestos fiber concentration). When such activities are carried out in a building, after all the work is completed, it must be demonstrated that the asbestos fiber concentration in the indoor air is below 500 F / m 3 and the Poisson upper limit value is below 1000 F / m 3 (measurement in accordance with VDI3492).

[0016] The term "low-emission method" includes activities that are inspected and approved by the authorities or the statutory accident insurance institutions in accordance with Section 2.8 of TRGS 519. The basis for the corresponding inspections is the evaluation criteria established by the German Institute for Occupational Safety and Health (IFA) affiliated with the statutory accident insurance. The methods approved by the statutory accident insurance institutions are currently published in BGI664 (see www.dguv.de) (for the determination of asbestos fiber concentration within the inspection of this method, refer to TRGS519, No. 4.3, Paragraph 2).

[0017] Regarding an advantageous cleaning laser device in this regard, the cleaning laser is formed as a Nd:YAG solid-state laser.

[0018] According to a further advantageous embodiment of the cleaning laser device, the output density of the cleaning laser has a single-pulse output in the range of several hundred kilowatts. Preferably, the single-pulse output is greater than 200 kW, more preferably greater than 500 kW, and even more preferably greater than 1000 kW. The high output density enables efficient ablation to be performed.

[0019] According to a further advantageous development of the cleaning laser device, the suction device is provided with a collection device for the suctioned asbestos-containing material. For example, a collection device formed like a vacuum cleaner bag enables the asbestos fibers released and suctioned by laser ablation to be collected separately. Laser ablation, also called laser evaporation, is the removal of a coating layer from the surface by irradiating the surface with pulsed laser light, also called laser vaporization. The high-output density laser light used here causes rapid heating on the surface and the formation of a plasma.

[0020] Regarding this, the collection device of the suction device is replaceable. Also, the collection device is preferably closable before replacement so that asbestos fibers are not released during the replacement. The thus replaceable collection device can continue the work without wasting time and can easily process asbestos fibers in accordance with the regulations.

[0021] Furthermore, the suction device is provided with a filter device, which is preferably formed as a HEPA filter. The filter device can clean the sucked air together with the removed coating layer and the released asbestos fibers. A HEPA filter (High Efficiency Particulate Air filter) is a particulate filter suitable for filtering more than 99.9% of all dust particles larger than 0.1 to 0.3 micrometers (μm), such as viruses, particulate matter, mite eggs and mite excrement, pollen, smoke particles, asbestos, bacteria, various toxic dusts, and aerosols from the air.

[0022] In this case, preferably, the filter device also includes a filter shaker. The filter shaker can clean the asbestos fibers deposited on the filter device from the filter device and enables, for example, the collection of asbestos fibers in a collection device. Preferably, the filter shaker is formed as a manually or mechanically operable filter shaker.

[0023] Advantageously, the cleaning laser device has a suction device with a suction force greater than 3 kW, preferably greater than 5 kW, more preferably greater than 7 kW. This scale of suction force ensures the safe suction of asbestos fibers during the cleaning process. Preferably, the suction device is formed as a vacuum suction device. Since the inside of the suction device is in a vacuum and negative pressure, it is guaranteed that the asbestos fibers once sucked remain in the collection device of the suction device.

[0024] According to an additional advantageous embodiment of the cleaning laser device, the cleaning laser device has an enclosure, where the enclosure is formed such that the cleaning laser is asbestos-free during the cleaning process. In this regard, the enclosure is formed as a housing. Additionally, the enclosure can be composed of a tubular film having a defined thickness, preferably an LDPE tubular film with a thickness of 100 μm. Other tubular films having a thickness in the range of 50 μm to 250 μm are also conceivable. Preferably, the enclosure ensures that the cleaning laser is not exposed to asbestos, so that this cleaning laser can still be used for other applications outside the asbestos area.

[0025] Furthermore, the cleaning laser device comprises an operating device having a control function, which is preferably configured to automatically adapt the suction flow of the suction device to the parametrization of the cleaning laser. For example, higher energy density and shorter pulse length may, depending on the situation, release more asbestos fibers, so it is advantageous to adapt the suction device. In particular, for example, higher power density and / or shorter pulse length can result in stronger suction. The operating device also automatically optimally adjusts the suction flow of the suction device.

[0026] Advantageously, the operating device is configured to cause the suction device to operate in a follow-up mode after the completion of the cleaning process. This ensures that after the cleaning process has stopped, the suction device continues to suction the working area for a certain period, thereby also suctioning asbestos fibers that may have been released without being suctioned.

[0027] According to an advantageous embodiment of the cleaning laser device, the cleaning device comprises a holding device on which the cleaning laser can be arranged to always have the same distance from the surface of the metal having the coating layer. When maintaining a constant distance from the surface of the metal, it is sufficient to parameterize the cleaning laser before the cleaning process. Furthermore, the feed of the cleaning device can be more easily controlled during the cleaning process. In addition, the workload for the operator is also reduced. Preferably, the holding device is formed as an industrial robot.

[0028] Furthermore, according to the method of the type described at the beginning, this problem is solved by removing the coating layer using a cleaning laser device comprising a cleaning laser having a laser optical system that emits laser light and a suction device having a suction opening. The exposure level to asbestos fibers must be determined by workplace measurements in accordance with TRGS 402 in conjunction with DIN EN 689. This is illustrated by the measurement results of the average asbestos fiber concentration (average of the work shift) related to an 8-hour work shift. Removing the coating layer using the cleaning laser device provides a very efficient method of ablating the minimum concentration of asbestos fibers for removing the coating layer containing asbestos-containing material from the surface of the metal during the cleaning process, so that the activities in the work area are only exposed to low levels of asbestos. An advantageous method in this regard is a low-emission method in accordance with TRGS 519.

[0029] According to a further advantageous embodiment of the method, during the cleaning process, the removed coating layer, together with the released asbestos-containing material, is sucked into the suction device through the suction opening. This ensures that asbestos fibers are only released at a low asbestos fiber concentration.

[0030] According to a further advantageous method, the cleaning laser is formed as a Nd:YAG solid-state laser and emits invisible infrared laser light, also called laser radiation. Preferably, the infrared laser light is emitted at a wavelength of 1064 nm. Surprisingly, it has been found that a Nd:YAG solid-state laser with an emitted wavelength of 1064 nm provides optimal ablation results for a coating layer having an asbestos-containing material.

[0031] According to a further preferred development of the method, the output density of the cleaning laser device has a single-pulse output in the range of 200 kW to 2000 kW, and the pulse length is in the range of 50 ns to 200 ns. The combination of the output density and the pulse length in each of the aforementioned ranges causes significant heating of the surface during the pulse. Preferably, the output density is several hundred kilowatts, particularly 200 kW to 500 kW. Since the heat conduction to the volume of the coating layer is relatively slow, the rapidly introduced heat usually cannot flow away. Therefore, the surface of the coating layer provided with the asbestos-containing material is heated to such an extent that it changes to a plasma state. In this case, this plasma may reach a density that absorbs most of the laser light, as a result protecting the underlying surface from further heating. The cleaning laser device optimally removes the coating layer.

[0032] According to a further advantageous method, the suction device has a filter device, and in this case, the filter device further comprises a filter shaker suitable for cleaning the filter device. Thereby, the suctioned and removed coating layer can always be optimally filtered together with the asbestos-containing material, for example, ensuring that the filter device is not clogged with asbestos fibers.

[0033] According to an additional preferred embodiment of the present method, the cleaning laser device comprises an operating device having a control function, and this operating device is configured to automatically adapt the suction flow of the suction device to the parameterization of the cleaning laser. The adaptation of the suction device is advantageous, for example, because at a higher energy density and a shorter pulse length, more asbestos fibers are released by laser ablation during the cleaning process. In particular, for example, a higher output density and / or a shorter pulse length can result in stronger suction. Thus, the operating device also automatically optimally adapts the suction flow of the suction device to the laser ablation.

[0034] Advantageously, the operating device is configured to cause the follow-up operation of the suction device after the completion of the cleaning process. This ensures that after the cleaning process has stopped, the suction system continues to suction the working area for a certain period of time, thereby also suctioning asbestos fibers that may have been released and not suctioned. In this regard, the follow-up operation is carried out between 30 seconds and 10 minutes.

[0035] Furthermore, according to an additional embodiment of the preferred method, the cleaning laser device comprises an operating device having a control function, and the operating device is configured such that when the cleaning laser is switched on, the suction device is switched on. Thereby, the suction device is switched on during the cleaning process using the cleaning laser, and it is ensured that the removed coating layer is always suctioned together with the asbestos-containing material.

[0036] The present invention will be described in more detail below with reference to the accompanying drawings.

Brief Description of the Drawings

[0037]

Figure 1

Embodiments for Carrying Out the Invention

[0038] FIG. 1 shows a schematic view of an exemplary embodiment of a cleaning device 1 for removing a coating layer 3 having an asbestos-containing material 2 from the surface 4 of a metal during a cleaning process.

[0039] The following silicates, actinolite, amosite, anthophyllite, chrysotile, crocidolite, and tremolite, which have a fibrous structure, are called asbestos.

[0040] The asbestos-containing material 2 is a mixture and product containing asbestos, and in the case of this mixture and product, the performance of the work may lead to the generation or release of fibrous dust.

[0041] The cleaning laser device 1 includes a cleaning laser 5 having a laser optical system 7 that emits laser light 6, and a suction device 9 having a suction opening 8. The suction opening 8 is arranged adjacent to the cleaning laser 5. As a result, during the cleaning process, the coating layer 3 removed by the laser light 6 emitted from the laser optical system 7 is sucked into the suction device 9 through the suction opening, together with at least partially released asbestos-containing material 2.

[0042] In this method, the coating layer 3 is removed from the surface 4 of the metal while forming a plasma by the impact of the pulsed laser light 6. Preferably, the cleaning laser 5 is formed as a Nd:YAG solid-state laser 10. The Nd:YAG solid-state laser 10 emits invisible infrared light with a wavelength of 1064 nm. Other cleaning lasers 5 having shorter emission wavelengths are also possible in principle, but they are generally not very efficient in removing the coating layer 3 having the asbestos-containing material 2.

[0043] To remove the coating layer 3 at an economically feasible removal rate, a high output density with a single pulse output in the range of several hundred kilowatts is required. The cleaning laser 5 used in the illustrated embodiment has a laser optical system that is a CL1000 laser cleaning system manufactured by Clean Laser Systems of OSH80. The nominal output of the CL1000 laser cleaning system is 1000W, and the single pulse output density of the cleaning laser 5 used in this embodiment is several hundred kilowatts.

[0044] In an unrealistic embodiment, the OSH80 or EffiScan of the manual optical system and a quick change fiber were used. The single pulse output density used was greater than 200kW, especially greater than 500kW.

[0045] The pulse length is typically in the range of 50ns to 200ns. In this embodiment, a pulse length on the order of 100ns was selected so that significant heating of the surface 4 could occur during the pulse. Since the heat conduction to the volume of the coating layer 4 is relatively slow, the rapidly introduced heat usually cannot flow away, and as a result, the coating layer 3 is heated to the extent that it changes to a plasma state. In this case, this plasma may have a density that absorbs most of the laser light 6, thereby protecting the underlying surface from further heating.

[0046] Preferably, the suction device 9 is formed as a vacuum suction device. In this embodiment, a DG50EXP asbestos suction system with a suction force of 5kW and having asbestos approval by TRGS519 manufactured by Delphin Industrial Vacuum is used as the suction device 9.

[0047] In other realized embodiments, a suction force of 3kW or 7kW was used.

[0048] Furthermore, the suction device 9 comprises a collection device 11 for the suctioned asbestos-containing material 2. Preferably, the collection device 11 of the suction device 9 is replaceable. Furthermore, the collection device is formed so as to be dust-proof and sealable during replacement, thereby preventing leakage of the asbestos-containing material 2.

[0049] Furthermore, the suction device 9 comprises a filter device 12, and in this case, the filter device 12 is preferably formed as a HEPA filter 13 of filter class H14. In addition, a filter shaker 14 for mechanically cleaning the filter device 12 by manual operation is arranged in the filter device 12.

[0050] In the illustrated embodiment, the cleaning laser device 1 has an optional enclosure 15. The enclosure 15 is formed so that the cleaning laser 5 does not come into contact with the asbestos-containing material 2 during the cleaning process, and thus remains asbestos-free. The enclosure 15 can optionally be formed, for example, as a housing 16 as shown in the embodiment, or as a tubular film. When using a tubular film, it is preferable to use an LDPE tubular film with a thickness in the range of 50 μm to 200 μm, particularly preferably 100 μm, with a sufficient length.

[0051] In this embodiment, the cleaning laser device 1 further comprises an operating device 17 having a control function. The operating device 17 is configured, inter alia, to automatically adapt the suction flow of the suction device 9 to the parameterization of the cleaning laser 5, and / or to cause a follow-up operation of the suction device 9 after completion of the cleaning process, and / or to cause the switch of the suction device 9 to turn on when the switch of the cleaning laser 5 is turned on. If the cleaning laser device does not comprise the operating device 17, the suction device 9 must always be set to the maximum suction force.

[0052] Furthermore, the cleaning device 1 comprises a holding device 18 on which the cleaning laser 5 can be arranged. The holding device 18 (preferably a movable frame or, as shown in the embodiment, an industrial robot 19 having a plurality of robot arms 23 arranged to be movable relative to each other) ensures that the laser optics 6 of the cleaning laser 5 always has the same distance 20 from the surface 4 of the metal having the coating layer 3. In addition, the holding device 18 can ensure the accurate feed 22 of the cleaning laser 5. Thereby, the quality of laser cleaning is significantly improved compared to the manual cleaning laser 5.

[0053] A method for removing a coating layer 3 having an asbestos-containing material 2 from the surface 4 of a metal during a cleaning process, wherein during the cleaning process, the asbestos fiber concentration in the workplace 21 is less than the asbestos fiber acceptance concentration of 10,000 F / m on average during a work shift 3 In this method, the removal of the coating layer 3 is performed using the cleaning laser device 1, and the cleaning laser device 1 includes a cleaning laser 5 having a laser optics 7 that emits laser light 6 and a suction device 9 having a suction opening 8. The suction device 9 is suitable for sucking the vaporized coating layer 3 together with the released asbestos-containing material 2 through the suction opening 8 into the suction device 9 during the cleaning process. This method is preferably a low-emission method compliant with TRGS 519.

[0054] Low-exposure activities are low-risk operations defined in TRGS 910, and the asbestos fiber tolerance concentration is less than 10,000 asbestos fibers / m 3 (abbreviation F / m 3 ) of the operation (for the determination of the asbestos fiber concentration, refer to No. 4.3, paragraph 1 of TRGS 519). When such activities are carried out indoors, after all the work is completed, it must be demonstrated that the fiber concentration in the indoor air is less than 500 F / m 3 and the upper limit Poisson value is less than 1000 F / m 3 (measurement compliant with VDI3492).

[0055] The term "low emission method" includes activities that comply with No. 2.8 of TRGS 519, which have been inspected and approved by the authorities or the statutory accident insurance institutions. The basis for the corresponding inspection is the evaluation criteria established by the German Statutory Accident Insurance - affiliated Institute for Occupational Safety and Health (IFA). The methods approved by the statutory accident insurance institutions are currently published in BGI664 (see www.dguv.de) (for the determination of asbestos fiber concentration within the inspection of this method, see TRGS519, No. 4.3, paragraph 2).

[0056] Preferably, the cleaning laser device 1 is formed as a Nd:YAG solid - state laser 10 and has a cleaning laser 5 that emits non - visible infrared rays. At this time, the infrared laser light 6, also called infrared rays, is preferably emitted at a wavelength of 1064 nm.

[0057] The output density of the cleaning laser device 1 has a single - pulse output particularly in the range of 200 kW to 2000 kW, and the pulse length is in the range of 50 ns to 200 ns. In particular, an output density of several hundred kilowatts with a pulse length in the range of 80 ns to 150 ns, particularly 200 kW to 500 kW, is advantageous.

[0058] The suction device 9 has a filter device 12. At this time, the filter device 12 further includes a filter shaker 14 suitable for cleaning the filter device 12. The dust removal of the filter device 12 can be carried out manually as required or can be controlled by an operating device. Such dust removal can operate, for example, when the pressure loss occurring through the filter device 12, which can be detected particularly by pressure difference measurement, increases beyond a threshold value.

[0059] Finally, the cleaning laser device 1 is provided with an operating device 17 having a control function, and this control device is configured to automatically adapt the suction flow of the suction device 9 to the parameterization of the cleaning laser 5 and / or to cause a follow-up operation of the suction device 9 after completion of the cleaning process. At this time, the follow-up operation preferably operates between 30 seconds and 10 minutes and / or is configured such that the switch of the suction device 9 is turned on when the switch of the cleaning laser 5 is turned on.

Claims

1. In a cleaning laser device (1) for removing a coating layer (3) having an asbestos-containing material (2) from the surface (4) of a metal during a cleaning process, the cleaning laser device (1) comprises a cleaning laser (5) having a laser optical system (7) for emitting laser light (6), and a suction device (9) having a suction opening (8), during the cleaning process, the coating layer (3) on the surface (4) of the metal can be removed by the laser light (6) emitted from the laser optical system (7), as a result, the asbestos-containing material (2) can be at least partially discharged, the suction opening (8) is arranged adjacent to the cleaning laser, as a result, the removed coating layer (3) can be sucked together with the discharged asbestos-containing material (2) through the suction opening (8) into the suction device (9), characterized in that the cleaning laser device (1).

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

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

4. The suction device (9) comprises a collection device (11) for the sucked asbestos-containing material (2), characterized in that the cleaning laser device (1) according to any one of claims 1 to 3.

5. The collection device (11) of the suction device (9) is replaceable, characterized in that the cleaning laser device (1) according to claim 4.

6. The suction device (9) has a filter device (12), and the filter device (12) is preferably formed as a HEPA filter (13), characterized in that the cleaning laser device (1) according to any one of claims 1 to 5.

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

8. The suction device (9) is formed as a vacuum suction device, characterized in that the cleaning laser device (1) according to any one of claims 1 to 7.

9. The suction device (9) has a suction force greater than 3 kW, preferably greater than 5 kW, more preferably greater than 7 kW. The cleaning laser device (1) according to any one of claims 1 to 8, characterized in that.

10. The cleaning laser device (1) is provided with an enclosure (15). At this time, the enclosure (15) is formed so that the cleaning laser (5) does not contain asbestos during the cleaning process. The cleaning laser device (1) according to any one of claims 1 to 9, characterized in that.

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

12. The cleaning laser device (1) is provided with an operating device (17) having a control function. The operating device (17) is configured to automatically adapt the suction flow of the suction device (9) to the parameterization of the cleaning laser (5). The cleaning laser device (1) according to any one of claims 1 to 11, characterized in that.

13. The operating device (17) is configured to cause a follow-up operation of the suction device (9) after the completion of the cleaning process. The cleaning laser device (1) according to claim 12, characterized in that.

14. The cleaning laser device (1) is provided with a holding device (18). The cleaning laser (5) can be arranged on the holding device (18) so as to always have the same interval (20) with respect to the surface (4) of the metal having the coating layer (3). The cleaning laser device (1) according to any one of claims 1 to 13, characterized in that.

15. A method for removing a coating layer (3) having an asbestos-containing material (2) from the surface (4) of a metal during a cleaning process, During the cleaning process, the asbestos fiber concentration in the workplace (21) is less than the asbestos fiber acceptance concentration of 10,000 F / m on average for the work shift ３ and In this method, The removal of the coating layer (3) is performed using a cleaning laser device (1), and the cleaning laser device (1) includes a cleaning laser (5) having a laser optical system (7) that emits laser light (6) and a suction device (9) having a suction opening (8). A method characterized by that.

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

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

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

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

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

21. The suction device (9) has a filter device (12). At this time, the filter device (12) further includes a filter shaker (14) suitable for cleaning the filter device (12). The method according to any one of claims 15 to 20, characterized in that...

22. The cleaning laser device (1) is provided with an operating device (17) having a control function. The operating device (17) is configured to automatically adapt the suction flow of the suction device (9) to the parameterization of the cleaning laser (5). The method according to any one of claims 15 to 21, characterized in that...

23. The cleaning laser device (1) has an operating device (17) having a control function. The operating device (17) is configured to cause a follow-up operation of the suction device (9) after the completion of the cleaning process. The method according to any one of claims 15 to 22, characterized in that...

24. The follow-up operation is performed within 30 seconds to 10 minutes. The method according to claim 23, characterized in that...

25. The cleaning laser device (1) is provided with an operating device (17) having a control function. At this time, the operating device (17) is configured such that when the cleaning laser (5) is switched on, the suction device (9) is switched on. The method according to any one of claims 15 to 24, characterized in that...

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