Acoustic board

Abstract

The utility model discloses an acoustic board, which relates to the technical field of noise reduction, and comprises a plurality of first kerf groups arranged at intervals along a first direction X. Each first kerf group comprises a plurality of first kerfs arranged at intervals along a second direction Y. The first kerf penetrates through the two surfaces of the acoustic board in the thickness direction Z, and the first direction X, the second direction Y and the thickness direction Z are perpendicular to one another. When the acoustic board is stretched along the first direction X, the gap of the first kerf is widened and deformed, so that the acoustic board can be stretched along the first direction X more easily, and the size of the acoustic board in the first direction X is finely adjusted. Therefore, when the size of the wall surface is slightly different from the size of the acoustic board, the acoustic board can be matched with the size of the wall surface by stretching the acoustic board, so that the construction is more convenient, and the acoustic board can be conveniently paved on the wall surface and is more attractive.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction technology, and in particular to a sound-absorbing panel. Background Art

[0002] Sound-absorbing panels are a type of board made of porous materials. They can serve both sound absorption and decorative purposes. For example, they can be laid on walls to absorb the energy of indoor sound waves and reduce noise. At the same time, sound-absorbing panels can also beautify the walls and create a more aesthetically pleasing indoor environment.

[0003] The applicant's research revealed a challenge in the actual installation of sound-absorbing panels: the wall dimensions vary from household to household, while the panels themselves are of a uniform size. Therefore, during installation, the remaining wall area often falls short of the dimensions of a single panel; for example, the wall's width / height may be smaller than the panel's width / height. In such cases, on-site measurement and cutting of the PET panels are necessary before installation.

[0004] This approach has a significant problem: manual cutting has a large margin of error, and after installation, it may not be able to cover the entire wall surface well, leaving large gaps that affect the sound absorption effect and aesthetics.

[0005] In addition, during the actual installation process, there may be situations where the remaining wall area is slightly larger than a single panel. In this case, it is more difficult to cut and fill the sound-absorbing panel, but not filling it will also leave a large gap, affecting the sound absorption effect and aesthetics.

[0006] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Utility Model Content

[0007] The purpose of this invention is to provide a sound-absorbing panel whose size can be easily adjusted.

[0008] To achieve the above-mentioned utility model objective, this utility model proposes a sound-absorbing panel, which includes a plurality of first slit groups arranged at intervals along a first direction X. Each first slit group includes a plurality of first slits arranged at intervals along a second direction Y. The first slits penetrate the two surfaces of the sound-absorbing panel in the thickness direction Z. The first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other.

[0009] Furthermore, at least a portion of the outermost first slit of the first slit group is connected to the outer surface of the sound-absorbing plate.

[0010] Furthermore, one or both of the outermost two first slits in one of the two adjacent first slit groups are connected to the outer surface of the sound-absorbing panel;

[0011] One or all of the two outermost first slits of the first slit group are connected to the outer surface of the sound-absorbing plate.

[0012] Furthermore, the plurality of first cuts in the first cut group are located on the same straight line.

[0013] Furthermore, two adjacent first cuts along the first direction X are staggered along the second direction Y.

[0014] Furthermore, the distance between two adjacent first cuts in the first cut group along the second direction Y is 5mm to 100mm;

[0015] The length of the first slit is 10–60 mm;

[0016] The distance between two adjacent first slit groups along the first direction X is 3 to 300 mm.

[0017] Furthermore, multiple sets of the first slits are distributed along the first direction X, covering the entire sound-absorbing panel; or,

[0018] The sound-absorbing panel is provided with at least one first slit area, and the first slit group is provided in the first slit area.

[0019] Furthermore, the surface of the sound-absorbing panel is covered with a fluffy material to conceal the cuts.

[0020] Furthermore, the sound-absorbing panel includes a plurality of second slit groups arranged at intervals along the second direction Y, each second slit group including a plurality of second slits arranged at intervals along the first direction X, the second slits penetrating the two surfaces of the sound-absorbing panel in the thickness direction Z.

[0021] Furthermore, at least a portion of the outermost first slit of the second slit group is connected to the outer surface of the sound-absorbing panel.

[0022] Furthermore, one or both of the outermost two second slits in one of two adjacent second slit groups are connected to the outer surface of the sound-absorbing panel; or,

[0023] One or all of the two outermost second slits of the entire second slit group are connected to the outer surface of the sound-absorbing panel.

[0024] Furthermore, the plurality of second cuts in the second cut group are located on the same straight line.

[0025] Furthermore, two adjacent second cuts along the second direction Y are staggered along the first direction X.

[0026] Furthermore, the distance between two adjacent second cuts in the second cut group along the first direction X is 5mm to 100mm;

[0027] The length of the second cut is 10–60 mm;

[0028] The interval between two adjacent second slit groups along the second direction Y is 3 to 300 mm.

[0029] Furthermore, multiple sets of the second slits are distributed along the second direction Y, covering the entire sound-absorbing panel; or,

[0030] The sound-absorbing panel is provided with at least one second slit area, and the second slit group is provided in the second slit area.

[0031] Compared with the prior art, the present invention has the following advantages: In the present invention, the sound-absorbing panel includes a plurality of first slit groups arranged at intervals along a first direction X. Each first slit group includes a plurality of first slits arranged at intervals along a second direction Y. The first slits penetrate the two surfaces of the sound-absorbing panel in the thickness direction Z. When the sound-absorbing panel is stretched along the first direction X, the gaps of the first slits widen and deform, thereby allowing the sound-absorbing panel to stretch more easily along the first direction X and its dimensions in the first direction X to be finely adjusted. In this way, when the size difference between the wall and the sound-absorbing panel is small, the dimensions of the sound-absorbing panel and the wall can be matched by stretching the sound-absorbing panel, making construction more convenient and allowing for easy full coverage of the wall, resulting in a more aesthetically pleasing appearance. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a sound-absorbing panel according to some embodiments of the present invention. In the figure, the sound-absorbing panel has a slit.

[0033] Figure 2 yes Figure 1 The image shows a plan view of the sound-absorbing panel.

[0034] Figure 3 yes Figure 2 Enlarged view of Part II.

[0035] Figure 4 This is a partial schematic diagram of the sound-absorbing panel in some embodiments of this utility model.

[0036] Figure 5This is a plan view of a sound-absorbing panel according to some embodiments of the present invention. In the figure, the sound-absorbing panel includes intersecting cuts.

[0037] Figure 6 yes Figure 5 Enlarged view of Part III.

[0038] Figure 7 This is a plan view of a sound-absorbing panel according to some embodiments of the present invention. In the figure, the sound-absorbing panel is provided with a first slit area and a second slit area.

[0039] Figure 8 This is a plan view of a sound-absorbing panel according to some embodiments of this utility model. DETAILED DESCRIPTION

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0041] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] like Figure 1As shown, this utility model proposes a sound-absorbing panel, which is generally plate-shaped and has two surfaces located at both ends in its thickness direction Z and an outer surface 1c connecting the two surfaces. The sound-absorbing panel includes a plurality of first slit groups 30 arranged at intervals along a first direction X, and each first slit group 30 includes a plurality of first slits 31 arranged at intervals along a second direction Y. The first slits 31 penetrate the two surfaces of the sound-absorbing panel in the thickness direction Z. The first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other (the included angle between each pair is 90°).

[0044] The first slit assembly 30 is designed so that when the sound-absorbing panel is stretched along the first direction X, the gap in the first slit 31 widens and deforms, allowing the sound-absorbing panel to stretch more easily along the first direction X and its dimensions in that direction X to be finely adjusted. Thus, when the dimensions of the wall and the sound-absorbing panel are only slightly different, the dimensions of the sound-absorbing panel and the wall can be matched by stretching the sound-absorbing panel, making construction more convenient and allowing for easy and aesthetically pleasing wall coverage.

[0045] Figure 1 and Figure 2 The sound-absorbing panel shown is rectangular. Typically, walls are rectangular in shape, therefore, rectangular sound-absorbing panels fit the wall better. It is understood that the area where the sound-absorbing panel is installed does not have to be a wall; it can be other areas. The sound-absorbing panel can also be designed in other shapes as needed. For example, when the sound-absorbing panel is approximately circular, it is suitable for installation in circular areas; when the sound-absorbing panel is trapezoidal, it is suitable for installation in trapezoidal areas. In other embodiments, the sound-absorbing panel can also be other shapes.

[0046] In some embodiments, at least a portion of the first slit group 30 is connected to the outermost first slit 31 of the sound-absorbing panel via a connection. This prevents the outer edge of the sound-absorbing panel from acting as a frame, facilitating stretching along the first direction X and causing deformation. Further optionally, in two adjacent first slit groups 30, at least one of the first slit groups 30 is connected to the outermost first slit 31 of the sound-absorbing panel via a connection, for example… Figures 1 to 3 In the illustrated embodiment, the outermost first slit 31 of one of two adjacent first slit groups 30 is connected to the outer surface 1c of the sound-absorbing panel, while the other is not connected. This allows the sound-absorbing panel to maintain a certain structural strength while being easily stretched and deformed. For example, Figure 4In the illustrated embodiment, the outermost first slit 31 of all the first slit groups 30 is connected to the outer surface 1c of the sound-absorbing panel, making the sound-absorbing panel easier to stretch and deform. It is understood that there are two outermost first slits 31 in the first slit group 30; one of them may be connected to the outer surface 1c of the sound-absorbing panel while the other is not, or both outermost first slits 31 may be connected to the outer surface 1c of the sound-absorbing panel, allowing the sound-absorbing panel to deform more uniformly.

[0047] Optionally, the multiple first cuts 31 of the first cut group 30 are located on the same straight line, so that the sound-absorbing plate 30 can be better deformed along the first direction X and is less prone to shape distortion.

[0048] refer to Figures 1 to 3 Two adjacent first cuts 31 in the first direction X are staggered in the second direction Y so that the sound-absorbing panel can reliably deform along the first direction X and has good structural strength.

[0049] It is understandable that the number and spacing of the first slit group 30, as well as the number, spacing, and length of the first slit 31, have a significant impact on the ease of stretching the sound-absorbing panel and its elongation.

[0050] In some embodiments, reference Figure 3 The spacing D1 between two adjacent first slits 31 in the first slit group 30 along the second direction Y is 5-100mm. This ensures that the spacing D1 between two adjacent first slits 31 is neither too large, resulting in insufficient deformation of the sound-absorbing panel, nor too close, leading to insufficient strength and easy tearing. It is understood that the distance between any two adjacent first slits 31 can be the same (i.e., the first slits 31 of the first slit group 30 are equidistant) or different (i.e., the first slits 31 of the first slit group 30 are not equidistant).

[0051] For ease of description, the slit that communicates with the outer surface 1c of the sound-absorbing panel is called the outer slit, and the slit that does not communicate with the outer surface 1c of the sound-absorbing panel is called the inner slit. In some embodiments, reference is made to... Figure 3 The length L2 of the inner slit in the first slit group 30 is 10-60 mm, so that the first slit 31 has a suitable length, ensuring the structural strength of the sound-absorbing panel while allowing the sound-absorbing panel to have good deformation after tension. It is understood that all the inner slits can be the same length, or at least two inner slits can have different lengths.

[0052] In some embodiments, reference Figure 3The spacing D2 between two adjacent first slit groups 30 along the first direction X is 3-300mm. This spacing is more suitable, ensuring that the distance between two adjacent first slit groups 30 is not too small, which helps to ensure the overall structural strength of the sound-absorbing panel and prevents accidental contact between adjacent slits during processing, thus avoiding the sound-absorbing panel being cut. On the other hand, the distance between two adjacent first slit groups 30 is also not too large, resulting in less deformation or uneven deformation of the sound-absorbing panel. It is understood that the distance between any two adjacent first slit groups 30 can be the same (i.e., the first slit groups 30 are equidistant) or different (i.e., the first slit groups 30 are not equidistant).

[0053] It is understandable that when the slits are arranged along the first direction X, the sound-absorbing panel is more suitable for tensile deformation along the first direction X. To allow the sound-absorbing panel to be sized in more directions to accommodate walls of different sizes, in some embodiments, reference is made to... Figure 5 and Figure 6 The sound-absorbing panel also includes a plurality of second slit groups 32 arranged at intervals along the second direction Y. Each second slit group 32 includes a plurality of second slits 33 arranged at intervals along the first direction X. The second slits 33 penetrate both surfaces of the sound-absorbing panel in the thickness direction Z. In this way, the sound-absorbing panel can be adjusted in size along the first direction X and the second direction Y, and can adapt to more situations that require size adjustment.

[0054] The structure and parameters of the second slit group 32 can be referenced in the description of the first slit group 30 above, for example as follows.

[0055] In some embodiments, at least a portion of the second slit group 32 has its outermost second slit 33 connected to the outer surface 1c of the sound-absorbing panel. This prevents the outer edge of the sound-absorbing panel from acting as a frame, facilitating the stretching of the sound-absorbing panel along the second direction Y and causing deformation. Further optionally, in two adjacent second slit groups 32, at least one of the second slit groups 32 has its outermost second slit 33 connected to the outer surface 1c of the sound-absorbing panel, for example… Figure 5 and Figure 6In the illustrated embodiment, the outermost second slit 33 of one of two adjacent second slit groups 32 is connected to the outer surface 1c of the sound-absorbing panel, while the other is not connected. This allows the sound-absorbing panel to maintain a certain structural strength while being easily stretched and deformed. Alternatively, all the outermost second slits 33 of the second slit groups 32 can be connected to the outer surface 1c of the sound-absorbing panel, making the sound-absorbing panel easier to stretch and deform. It is understood that there are two outermost second slits 33 in the second slit group 32. One of the second slits 33 can be connected to the outer surface 1c of the sound-absorbing panel, while the other is not connected; alternatively, both outermost second slits 33 can be connected to the outer surface 1c of the sound-absorbing panel, allowing for more uniform deformation of the sound-absorbing panel.

[0056] Optionally, the multiple second slits 33 of the second slit group 32 are located on the same straight line, so that the sound-absorbing plate 30 can be better deformed along the second direction Y and is less prone to shape distortion.

[0057] refer to Figure 5 and Figure 6 Two adjacent second cuts 33 in the second direction Y are staggered in the first direction X so that the sound-absorbing panel can reliably deform along the second direction Y and has good structural strength.

[0058] In some embodiments, the second slit group 32 is connected to the outermost second slit 33 (i.e., the outer slit) and the outer side 1c of the sound-absorbing panel. In this way, the outer edge of the sound-absorbing panel will not play a framing role, making it easier for the sound-absorbing panel to be stretched along the second direction Y.

[0059] It is understandable that, similarly, the number and spacing of the second slit group 32, as well as the number, spacing, and length of the second slit 33, have a significant impact on the elongation of the sound-absorbing panel.

[0060] In some embodiments, reference Figure 6 The spacing D3 between two adjacent second slits 33 in the second slit group 32 along the first direction X is 5-100mm. This ensures that the spacing between two adjacent second slits 33 is neither too large, resulting in insufficient deformation of the sound-absorbing panel, nor too close, leading to insufficient strength and easy tearing. It is understood that the distance between any two adjacent second slits 33 can be the same (i.e., the second slits 33 of the second slit group 32 are equidistant) or different (i.e., the second slits 33 of the second slit group 32 are not equidistant).

[0061] In some embodiments, reference Figure 6The length L3 of the second slit 33 is 10–60 mm to ensure that the second slit 33 has a suitable length, so as to ensure the structural strength of the sound-absorbing panel and that the sound-absorbing panel has a good amount of deformation after tension. It is understood that all the second slits 33 can be the same length, or at least two of the second slits 33 can be different in length.

[0062] In some embodiments, reference Figure 6 The spacing D4 between two adjacent second slit groups 32 along the second direction Y is 3–300 mm. This spacing is more suitable because, on the one hand, the distance between two adjacent second slit groups 33 is not too small, which helps to ensure the overall structural strength of the sound-absorbing panel and prevents accidental contact between adjacent slits during processing, thus avoiding the sound-absorbing panel being cut. On the other hand, the distance between two adjacent second slit groups 33 is not too large, which would result in a small amount of deformation or uneven deformation of the sound-absorbing panel. It is understood that the distance between any two adjacent second slit groups 32 can be the same (i.e., the second slit groups 32 are equidistant) or different (i.e., the second slit groups 32 are not equidistant).

[0063] Optionally, the surface of the sound-absorbing panel is covered with a pile. The pile can be inherent to the material itself (e.g., PET sheets have pile), or it can be added later. When the sound-absorbing panel is stretched and the deformation of the sound-absorbing panel in the first direction X and / or the second direction Y does not exceed 2%, the deformation of each cut is very small. Under the coverage of the pile, the cut is basically undetectable, making it more aesthetically pleasing.

[0064] In some embodiments, one of the first direction X and the second direction Y is the length direction of the sound-absorbing panel, and the other is the width direction of the sound-absorbing panel, thus allowing adjustment of the length and width dimensions of the sound-absorbing panel. It is understood that the first direction X and the second direction Y do not necessarily correspond to the length or width direction of the sound-absorbing panel; they can also be inclined towards each other.

[0065] By setting spaced slits in both the first X and second Y directions of the sound-absorbing panel, the dimensions of the sound-absorbing panel in the first X and second Y directions can be adjusted. When the length and / or width of the sound-absorbing panel is slightly smaller than the wall surface, the sound-absorbing panel can be stretched to adapt its length and / or width to the dimensions of the wall surface, thereby more fully covering the wall surface and ensuring both aesthetics and sound absorption effect.

[0066] In some embodiments, a plurality of first slit groups 30 are arranged along the first direction X, covering the entire sound-absorbing panel, thereby maximizing the adjustable size range of the sound-absorbing panel. In other embodiments, the sound-absorbing panel is provided with at least one first slit area 34, and the first slit groups 30 are disposed in the first slit area 34. In this way, the stretchable size range of the sound-absorbing panel can be adjusted by adjusting the size of the first slit area 34 in the first direction X, reducing damage to the sound-absorbing panel and ensuring aesthetics. Figure 7 The illustration shows a case where there is one first slit area 34. When there are two or more first slit areas 34, the multiple first slit areas 34 are arranged at intervals along the first direction X.

[0067] Similarly, in some embodiments, multiple second slit groups 32 are arranged along the second direction Y, covering the entire sound-absorbing panel, thereby maximizing the adjustable size range of the sound-absorbing panel. In other embodiments, the sound-absorbing panel is provided with at least one second slit area 35, and the second slit groups 32 are located in the second slit area 35. In this way, the stretchable size range of the sound-absorbing panel can be adjusted by adjusting the size of the second slit area 35 in the second direction Y, reducing damage to the sound-absorbing panel and ensuring aesthetics. Figure 7 The illustration shows a case where there is one second slit area 35. When there are two or more second slit areas 35, the multiple second slit areas 35 are arranged at intervals along the second direction Y.

[0068] Understandably, when stretching the sound-absorbing panel, only the portion that needs stretching should be stretched, rather than stretching the entire panel. For example... Figure 8 In the scenario shown, the sound-absorbing panel is tilted on one side for some reason, thus giving it a trapezoidal shape. In this case, its upper left corner can be stretched to deform it into a rectangle. Figure 7 (The shape shown by the dotted line) allows it to better cover a rectangular wall surface. By stretching different parts of the sound-absorbing panel, its shape can be adjusted more flexibly according to the usage scenario, making it more convenient to use.

[0069] Understandably, to allow the sound-absorbing panel to stretch and deform, it is preferably made of a flexible, porous material with good sound absorption and breakage resistance. If a 9mm thick panel can be folded at least 100 times without breaking, it can be considered to be made of a flexible material. Optionally, the material for the sound-absorbing panel can be melamine sound-absorbing foam, melamine cotton, polyurethane foam, or polyester fiber, etc.

[0070] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A sound-absorbing panel, characterized in that, The sound-absorbing panel includes a plurality of first slit groups (30) arranged at intervals along a first direction X. Each first slit group (30) includes a plurality of first slits (31) arranged at intervals along a second direction Y. The first slits (31) penetrate the two surfaces of the sound-absorbing panel in the thickness direction Z. The first direction X, the second direction Y and the thickness direction Z are perpendicular to each other.

2. The sound-absorbing panel as described in claim 1, characterized in that, At least a portion of the first cut group (30) has its outermost first cut (31) connected to the outer surface (1c) of the sound-absorbing plate.

3. The sound-absorbing panel as described in claim 2, characterized in that, One or both of the two outermost first slits (31) of one of the two adjacent first slit groups (30) are connected to the outer surface (1c) of the sound-absorbing plate; One or both of the two outermost first slits (31) of all the first slit groups (30) are connected to the outer surface (1c) of the sound-absorbing plate.

4. The sound-absorbing panel as described in claim 1, characterized in that, The plurality of first cuts (31) of the first cut group (30) are located on the same straight line.

5. The sound-absorbing panel as described in claim 1, characterized in that, Two adjacent first cuts (31) along the first direction X are staggered in the second direction Y.

6. The sound-absorbing panel as described in claim 1, characterized in that, The spacing between two adjacent first cuts (31) of the first cut group (30) along the second direction Y is 5mm to 100mm; The length of the first slit (31) is 10-60 mm; The distance between two adjacent first slit groups (30) along the first direction X is 3 to 300 mm.

7. The sound-absorbing panel as described in claim 1, characterized in that, Multiple first slit groups (30) are distributed along the first direction X, covering the entire sound-absorbing panel; or... The sound-absorbing panel is provided with at least one first slit area (34), and the first slit group (30) is provided in the first slit area (34).

8. The sound-absorbing panel as described in claim 1, characterized in that, The surface of the sound-absorbing panel is covered with a felt to conceal the cuts.

9. The sound-absorbing panel according to any one of claims 1 to 8, characterized in that, The sound-absorbing panel includes a plurality of second slit groups (32) arranged at intervals along the second direction Y. Each second slit group (32) includes a plurality of second slits (33) arranged at intervals along the first direction X. The second slits (33) penetrate the two surfaces of the sound-absorbing panel in the thickness direction Z.

10. The sound-absorbing panel as described in claim 9, characterized in that, At least part of the second slit group (32) has its outermost first slit (31) connected to the outer side surface (1c) of the sound-absorbing plate.

11. The sound-absorbing panel as described in claim 10, characterized in that, One or both of the two outermost second slits (33) of one of the two adjacent second slit groups (32) are connected to the outer surface (1c) of the sound-absorbing panel; or, One or all of the two outermost second slits (33) of all the second slit groups (32) are connected to the outer surface (1c) of the sound-absorbing plate.

12. The sound-absorbing panel as described in claim 9, characterized in that, The plurality of second cuts (33) of the second cut group (32) are located on the same straight line.

13. The sound-absorbing panel as described in claim 9, characterized in that, Two adjacent second cuts (33) along the second direction Y are staggered in the first direction X.

14. The sound-absorbing panel as described in claim 9, characterized in that, The spacing between two adjacent second cuts (33) of the second cut group (32) along the first direction X is 5mm to 100mm; The length of the second slit (33) is 10-60 mm; The interval between two adjacent second slit groups (32) along the second direction Y is 3 to 300 mm.

15. The sound-absorbing panel as described in claim 9, characterized in that, Multiple sets of the second slits (32) are distributed along the second direction Y, covering the entire sound-absorbing panel; or... The sound-absorbing panel is provided with at least one second slit area (35), and the second slit group (32) is provided in the second slit area (35).

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