Light non-toxic sound-absorbing decorative plate

Abstract

The utility model relates to a light non-toxic sound absorption decorative plate. A high-frequency sound wave absorption layer and a low-frequency sound wave absorption layer which are arranged up and down are arranged between a perforated panel and a perforated back plate; the high-frequency sound wave absorption layer comprises a polyimide foam plate; the low-frequency sound wave absorption layer is of a low-frequency double-layer resonant cavity structure. By means of the structure, the requirement for structural strength is met, effective penetration of sound waves is guaranteed, meanwhile, the weight of the structure is reduced as much as possible, the sound waves firstly enter the polyimide porous foam material plate after penetrating through the perforated panel, medium-high frequency sound waves can be effectively dissipated through the high hole opening characteristic of the polyimide foam material, and therefore the sound waves can be effectively dissipated. And low-frequency sound waves which are difficult to absorb penetrate through the polyimide foam plate, reach the low-frequency sound wave absorption layer, and then form strong resonance in the low-frequency double-layer resonant cavity structure, so that the low-frequency sound waves are absorbed and dissipated, and the broadband noise reduction requirement is met.

Description

Technical Field

[0001] The present application relates to the technical field of ship outfitting and air noise control, and in particular to a lightweight, non-toxic sound-absorbing decorative panel. Background Art

[0002] At present, the structure of ship cabin decoration panels is mainly metal corrugated plate (metal plate thickness 3mm, corrugation height difference 22mm) + composite rock wool board (25mm thick), with a total thickness of about 47mm to 50mm. This kind of decorative board has the disadvantages of high surface density and heavy weight, and its sound absorption coefficient is low, which cannot meet the goals of reducing cabin air noise, improving cabin living environment, and improving personnel work efficiency. In addition, the composite rock wool board in its structure is easy to escape rock wool fibers that are harmful to the health of construction workers when cutting. Therefore, this kind of cabin decoration board can no longer meet the development needs of ships. At present, there are a certain number of sound-absorbing decorative board products on the market, but they are not acoustically designed for the cabin noise characteristics of ships, and cannot meet the toxicity and fire resistance requirements in the safety requirements of marine materials. They cannot be used in special ship cabins with high material safety requirements. Therefore, it is necessary to design and develop a new type of lightweight, high sound absorption coefficient, non-toxic and fireproof decorative board based on the environment and noise characteristics of ship cabins.

[0003] At present, the mature sound-absorbing non-metallic foam materials on the market are difficult to meet the toxicity and fire resistance requirements of ship cabins. For example, polyimide foam materials have the advantages of light weight, high sound absorption coefficient, non-toxicity and fire resistance, and easy processing. When used in ship cabins, they can effectively reduce the air noise in the cabin, but there are the following problems:

[0004] The superior sound absorption performance of polyimide foam material is mainly reflected in the mid- and high-frequency bands. When used alone, it is difficult to meet the wide-band noise reduction needs of ship cabins. Therefore, corresponding structural design is also required according to the noise characteristics of ship cabins, so as to further improve the low-frequency sound absorption performance while maintaining the mid- and high-frequency sound absorption advantages, and obtain a wide-band sound absorption and noise reduction effect. Summary of the invention

[0005] The embodiment of the present application provides a lightweight and non-toxic sound-absorbing decorative plate to solve the problems in the related art that the metal corrugated plate is heavy as a ship cabin decorative plate and the noise reduction frequency band of the polyimide foam material is difficult to meet the noise reduction requirements.

[0006] In a first aspect, a lightweight, non-toxic sound-absorbing decorative panel is provided, comprising:

[0007] Perforated panels;

[0008] A perforated back plate is provided with a high-frequency sound wave absorbing layer and a low-frequency sound wave absorbing layer arranged up and down between the perforated back plate and the perforated panel; the high-frequency sound wave absorbing layer comprises a polyimide foam board; and the low-frequency sound wave absorbing layer has a low-frequency double-layer resonance cavity structure.

[0009] In some embodiments, the low-frequency sound wave absorbing layer includes two honeycomb aluminum plates, a core plate with a first perforation is connected between the two honeycomb aluminum plates, and the core plate and the two honeycomb aluminum plates form the low-frequency double-layer resonance cavity structure;

[0010] The length and width of the honeycomb aluminum plate and the core plate are equal; the length and width of the high-frequency sound wave absorbing layer and the low-frequency sound wave absorbing layer are equal.

[0011] In some embodiments, the core plate is made of aluminum alloy material; the thickness of the core plate is 0.6 mm to 1.0 mm, the diameter of the first perforation thereon is 0.05 mm to 0.15 mm, and the opening rate of the first perforation is 2% to 3.5%.

[0012] In some embodiments, the thickness of the honeycomb aluminum plate 400 close to the perforated panel 1 is 0 mm to 15 mm, and the diameter of the inscribed circle of the hexagonal holes of the honeycomb aluminum plate is 5 mm to 8 mm;

[0013] The thickness of the honeycomb aluminum plate close to the perforated back plate is 10 mm to 20 mm, and the diameter of the inscribed circle of the hexagonal holes of the honeycomb aluminum plate is 2 mm to 4 mm.

[0014] In some embodiments, the polyimide foam board has a thickness of 30 mm to 50 mm.

[0015] In some embodiments, the perforated panel and the perforated back panel are made of stainless steel or aluminum alloy.

[0016] In some embodiments, the second perforations on the perforated panel and the perforated back plate are distributed in a rectangular array.

[0017] In some embodiments, the thickness of the perforated panel and the perforated back panel is 0.6 mm to 1.0 mm; the diameter d of the second perforation is 3 mm to 5 mm;

[0018] In the length direction, the spacing between two adjacent second perforations is l1, and l1 is 4 mm to 6 mm; in the width direction, the spacing between two adjacent second perforations is l2, and l2 is 4 mm to 6 mm;

[0019] In the length direction, the distance between the center of the first target perforation and the wide side is L1, and L1 is 20mm~30mm; in the width direction, the distance between the center of the second target perforation and the long side is L2, and L2 is 20mm~30mm; the first target perforation is the second perforation closest to the wide side of the perforated panel and the perforated back plate in the length direction; the second target perforation is the second perforation closest to the long side of the perforated panel and the perforated back plate in the width direction.

[0020] In some embodiments, metal connecting plates are provided on the long sides of the perforated panel and the perforated back panel; the two metal connecting plates located on the same side enclose a receiving groove, and a sound absorbing block is provided in the receiving groove.

[0021] In some embodiments, the metal connecting plate comprises a vertical plate, a first horizontal plate connected to the perforated panel or the perforated back plate is provided on the top of the vertical plate, and a second horizontal plate is provided on the top of the vertical plate;

[0022] When two lightweight non-toxic sound-absorbing decorative panels are connected, the vertical panels of the two lightweight non-toxic sound-absorbing decorative panels fit each other.

[0023] The beneficial effects of the technical solution provided by this application include:

[0024] The embodiment of the present application provides a lightweight, non-toxic sound-absorbing decorative panel, because a high-frequency sound wave absorbing layer and a low-frequency sound wave absorbing layer are arranged up and down between the perforated panel and the perforated back panel; the high-frequency sound wave absorbing layer includes a polyimide foam board; and the low-frequency sound wave absorbing layer has a low-frequency double-layer resonance cavity structure. The above structure can meet the structural strength requirements and ensure the effective penetration of sound waves while reducing the weight of the structure as much as possible. After the sound waves pass through the perforated panel, they first enter the polyimide porous foam board. The high open-pore characteristics of the polyimide foam material can effectively dissipate the medium and high frequency sound waves. The low-frequency sound waves that are difficult to be absorbed by it pass through the polyimide foam board and reach the low-frequency sound wave absorbing layer, and then form a strong resonance in the low-frequency double-layer resonance cavity structure, so that they are absorbed and dissipated to meet the broadband noise reduction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A top view of a lightweight, non-toxic, sound-absorbing decorative panel provided in an embodiment of the present application;

[0027] Figure 2 Provided in the embodiments of this application Figure 1 Schematic diagram of the AA section;

[0028] Figure 3 A schematic diagram of the connection form of adjacent lightweight non-toxic sound-absorbing decorative panels provided in an embodiment of the present application;

[0029] Figure 4 Provided in the embodiments of this application Figure 1The enlarged view at point B in the middle shows a schematic diagram of the distribution of the second perforations of the perforated panel and the perforated back panel.

[0030] In the figure: 1. perforated panel; 2. perforated back panel; 3. high-frequency sound wave absorbing layer; 4. low-frequency sound wave absorbing layer; 400, honeycomb aluminum plate; 401, core plate; 5. accommodating groove; 6. sound absorbing block; 7. metal connecting plate. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] The embodiment of the present application provides a lightweight, non-toxic sound-absorbing decorative panel to solve the problem in the related art that the metal corrugated panel is heavy as a ship cabin decorative panel and the noise reduction frequency band of the polyimide foam material is difficult to meet the noise reduction requirements.

[0033] See also Figure 1-Figure 4 , a lightweight, non-toxic sound-absorbing decorative panel, comprising:

[0034] Perforated panel 1;

[0035] The perforated back plate 2 is provided with a high-frequency sound absorbing layer 3 and a low-frequency sound absorbing layer 4 arranged up and down between the perforated panel 1; the high-frequency sound absorbing layer 3 comprises a polyimide foam board; and the low-frequency sound absorbing layer 4 has a low-frequency double-layer resonance cavity structure.

[0036] The above structure can meet the structural strength requirements and ensure the effective penetration of sound waves while reducing the weight of the structure as much as possible. After the sound waves pass through the perforated panel 1, they first enter the polyimide porous foam board. The high open-pore characteristics of the polyimide foam material can effectively dissipate the medium and high frequency sound waves. The low-frequency sound waves that are difficult to absorb pass through the polyimide foam board and reach the low-frequency sound wave absorbing layer 4, and then form a strong resonance in the low-frequency double-layer resonance cavity structure, which is absorbed and dissipated to meet the broadband noise reduction requirements.

[0037] The lightweight, non-toxic sound-absorbing decorative panel involved in this application eliminates the existing metal enclosure of the ship cabin, and can achieve a weight reduction of 1 / 2 to 3 / 5 compared with the existing decorative panel structure of the ship cabin, effectively reducing the weight burden of the ship. The sound-absorbing panel involved in this application does not introduce toxic organic materials such as adhesives and damping layers that are insufficiently fireproof during design and production, and has the advantages of being non-toxic and fireproof, having good flame retardancy, and being safe and environmentally friendly. Its performance meets the safety requirements of ship interior materials, and solves the problem that the toxicity and fireproof performance of the sound-absorbing panel products on the market are insufficient, so that they cannot be used in special ship cabins with high requirements for material safety. When used in ship cabins, it can fill the gap in ship sound-absorbing panels.

[0038] In some preferred embodiments, the structure of the low-frequency sound wave absorbing layer 4 is described in detail:

[0039] The low-frequency sound wave absorbing layer 4 includes two honeycomb aluminum plates 400, a core plate 401 with a first perforation is connected between the two honeycomb aluminum plates 400, and the core plate 401 and the two honeycomb aluminum plates 400 form a low-frequency double-layer resonance cavity structure;

[0040] The length and width of the honeycomb aluminum plate 400 and the core plate 401 are equal; the length and width of the high-frequency sound wave absorbing layer 3 and the low-frequency sound wave absorbing layer 4 are equal.

[0041] The perforated panel 1 and the perforated back panel 2 are made of stainless steel or aluminum alloy.

[0042] The second perforations on the perforated panel 1 and the perforated back panel 2 are distributed in a rectangular array.

[0043] The above is the general structure of each layer of the lightweight non-toxic sound-absorbing decorative board, but in order to meet specific requirements, the size needs to be designed in detail. The specific parameters are as follows:

[0044] The core plate 401 is made of aluminum alloy material; the thickness of the core plate 401 is 0.6mm-1.0mm, the diameter of the first perforation thereon is 0.05mm-0.15mm, and the opening rate of the first perforation is 2%-3.5%. The thickness of the honeycomb aluminum plate 400 close to the perforated panel 1 is 0mm-15mm, and the diameter of the inscribed circle of the hexagonal holes of the honeycomb aluminum plate 400 is 5mm-8mm; the thickness of the honeycomb aluminum plate 400 close to the perforated back plate 2 is 10mm-20mm, and the diameter of the inscribed circle of the hexagonal holes of the honeycomb aluminum plate 400 is 2mm-4mm.

[0045] The thickness of the polyimide foam board is 30 mm to 50 mm, and its opening rate is ≥ 96%. The thickness of the perforated panel 1 and the perforated back panel 2 is 0.6 mm to 1.0 mm; the diameter d of the second perforation is 3 mm to 5 mm;

[0046] refer to Figure 4In the length direction, the spacing between two adjacent second perforations is l1, and l1 is 4 mm to 6 mm; in the width direction, the spacing between two adjacent second perforations is l2, and l2 is 4 mm to 6 mm;

[0047] In the length direction, the distance between the center of the first target perforation and the wide side is L1, and L1 is 20mm~30mm; in the width direction, the distance between the center of the second target perforation and the long side is L2, and L2 is 20mm~30mm; the first target perforation is the second perforation closest to the wide side of the perforated panel 1 and the perforated back plate 2 in the length direction; the second target perforation is the second perforation closest to the long side of the perforated panel 1 and the perforated back plate 2 in the width direction.

[0048] refer to Figure 3 In some preferred embodiments, a metal connecting plate 7 is provided on the long sides of the perforated panel 1 and the perforated back plate 2; the two metal connecting plates 7 on the same side enclose a receiving groove 5, and a sound absorbing block 6 is provided in the receiving groove 5; the metal connecting plate 7 includes a vertical plate, a first horizontal plate connected to the perforated panel 1 or the perforated back plate 2 is provided on the top of the vertical plate, and a second horizontal plate is provided on the top of the vertical plate;

[0049] When two lightweight non-toxic sound-absorbing decorative panels are connected, the vertical panels of the two lightweight non-toxic sound-absorbing decorative panels fit each other.

[0050] Such a structural design reduces the transmission of noise from the gap between the two lightweight non-toxic sound-absorbing decorative panels when they are used, and minimizes the gap between the two lightweight non-toxic sound-absorbing decorative panels by fitting the vertical panels of the two lightweight non-toxic sound-absorbing decorative panels together. In addition, the sound-absorbing block 6 can absorb the sound waves entering the gap; the sound-absorbing block 6 can also be polyimide foam.

[0051] refer to Figure 1 , which shows the plane diagram of the sound-absorbing panel. Its width is 550mm and its length can be adaptively adjusted according to the installation space of the ship's cabin.

[0052] To sum up, the lightweight non-toxic sound-absorbing decorative panel involved in the present application replaces the existing decorative panel structure of metal corrugated panel + composite rock wool panel. The present application selects high-strength supporting materials such as stainless steel plate or aluminum alloy plate as the panel and back plate of the sound-absorbing panel, and then optimizes the perforation parameters and plate thickness of the perforated panel 1 and the perforated back plate 2, the core plate 401 and the honeycomb aluminum plate 400. While meeting the structural strength requirements and ensuring the effective penetration of sound waves, the weight of the structure is reduced as much as possible. Compared with the original decorative panel structure, the sound-absorbing panel involved in the present application has the characteristics of low surface density and light weight. Its surface density ranges from 12kg / m2 to 15kg / m2, while the surface density of the existing decorative panel structure is about 29kg / m2. In comparison, the sound-absorbing decorative panel involved in the present application can reduce the weight by 1 / 2-3 / 5, which has a significant weight reduction effect.

[0053] Taking into account the safety requirements such as toxicity and fire resistance of ship cabins, the sound-absorbing panels involved in this application have been fully designed and optimized. The materials required to make the sound-absorbing panels are only stainless steel plates, aluminum alloy plates, aluminum honeycombs, and polyimide foam materials. There is no need to introduce other organic materials such as adhesives and damping layers; the metal materials introduced into the sound-absorbing panels do not have safety issues such as toxicity and fire resistance. Compared with the shortcomings of existing foam materials on the market, which have insufficient toxicity and fire resistance, the polyimide foam material introduced in this application has the advantages of being non-toxic, flame-retardant and fire-resistant, and safe and environmentally friendly. It fully guarantees the non-toxic, fire-resistant, safe and environmentally friendly characteristics of the sound-absorbing panels involved in this application, so that they can be used in special ship cabins.

[0054] The air noise in the ship cabin has the characteristics of wide frequency band. In order to meet the noise reduction requirements of the ship cabin, the sound absorbing board should have the characteristics of wide sound absorption frequency band and high sound absorption coefficient. The sound absorbing board involved in this application adopts a porous sound absorbing material and a low-frequency double-layer resonance cavity in series. The porous sound absorbing material mainly absorbs and dissipates medium and high frequency sound waves, and the low-frequency double-layer resonance cavity mainly absorbs and dissipates low-frequency sound waves, thereby achieving the wide-band sound absorption effect of the sound absorbing board and meeting the needs of wide-band noise reduction. The acoustic design principle of the sound absorbing board is as follows:

[0055] a) Select stainless steel plate or aluminum alloy plate as the perforated panel 1 and perforated back plate 2 of the sound absorbing panel; through the perforation parameters and structure thickness, the strength of the perforated panel 1 and the perforated back plate 2 can meet the needs of supporting the entire structure while ensuring the effective penetration of sound waves.

[0056] b) After passing through the perforated panel, the sound waves first enter the polyimide porous foam board. The high open-pore characteristics of the polyimide foam material can effectively dissipate medium and high-frequency sound waves (≥500Hz). By optimizing and controlling the open-pore ratio, open-pore size and thickness of the polyimide foam board, the sound-absorbing decorative board can achieve excellent medium and high-frequency sound absorption effects.

[0057] c) After the sound waves enter the interior of the polyimide foam board, the medium and high frequency sound waves are effectively dissipated, and the low frequency sound waves (≤500Hz) that are difficult to be absorbed by it pass through the polyimide foam board and reach the low frequency double-layer resonance cavity structure composed of two honeycomb aluminum 400 and the core plate 401, wherein the upper layer of honeycomb aluminum 400 and the core plate 401 form a first layer of low frequency resonance cavity, and the thickness and hole size of the honeycomb aluminum of the cavity part are optimized by design, so that the resonance frequency range of the cavity is 250Hz to 500Hz. When the sound waves pass through the cavity, the sound waves of 250Hz to 500Hz will form a strong resonance in the cavity, thereby being absorbed and dissipated, and the lower layer of honeycomb aluminum 400 and the core plate 401 form a second layer of low frequency resonance cavity, and the thickness and hole size of the honeycomb aluminum of the cavity part are optimized by design, so that the resonance frequency range of the cavity is ≤250Hz. When the sound waves pass through the cavity, the sound waves of ≤250Hz will form a strong resonance in the cavity, thereby being absorbed and dissipated.

[0058] The lightweight, non-toxic sound-absorbing decorative panel involved in the present application does not introduce toxic organic materials such as adhesives and damping layers during design and production, and has the advantages of being non-toxic and fire-resistant, having good flame retardancy, and being safe and environmentally friendly. Its performance meets the high requirements for material safety for special ships, and solves the problem that the sound-absorbing panel products on the market are not toxic and have insufficient fire resistance, and thus cannot be used in ship cabins.

[0059] After sufficient design optimization and test verification, it has the advantages of wide sound absorption frequency band, high sound absorption coefficient, and sound absorption characteristics that meet the noise characteristics of ship cabins, thereby meeting the noise reduction needs of ship cabins, and its sound absorption performance is far better than the existing decorative panel structure, making up for the shortcomings of the existing ship cabin decorative panels with low mid- and high-frequency sound absorption coefficients and inability to effectively absorb low-frequency sound waves. It has great application value in reducing ship cabin air noise.

[0060] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0061] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0062] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A lightweight, non-toxic sound-absorbing decorative panel, characterized in that: It includes: Perforated panel (1); A perforated back plate (2) is provided with a high-frequency sound wave absorbing layer (3) and a low-frequency sound wave absorbing layer (4) arranged vertically between the perforated back plate (2) and the perforated face plate (1); the high-frequency sound wave absorbing layer (3) comprises a polyimide foam board; and the low-frequency sound wave absorbing layer (4) has a low-frequency double-layer resonance cavity structure.

2. The lightweight, non-toxic sound-absorbing decorative board according to claim 1, characterized in that: The low-frequency sound wave absorbing layer (4) comprises two honeycomb aluminum plates (400), a core plate (401) having a first perforation is connected between the two honeycomb aluminum plates (400), and the core plate (401) and the two honeycomb aluminum plates (400) form the low-frequency double-layer resonant cavity structure; The length and width of the honeycomb aluminum plate (400) and the core plate (401) are equal; the length and width of the high-frequency sound wave absorbing layer (3) and the low-frequency sound wave absorbing layer (4) are equal.

3. The lightweight, non-toxic sound-absorbing decorative board according to claim 2, characterized in that: The core plate (401) is made of aluminum alloy material; the thickness of the core plate (401) is 0.6 mm to 1.0 mm, the diameter of the first perforation thereon is 0.05 mm to 0.15 mm, and the opening rate of the first perforation is 2% to 3.5%.

4. The lightweight, non-toxic sound-absorbing decorative board according to claim 2, characterized in that: The thickness of the honeycomb aluminum plate (400) close to the perforated panel (1) is 0 mm to 15 mm, and the diameter of the inscribed circle of the hexagonal holes of the honeycomb aluminum plate (400) is 5 mm to 8 mm; The thickness of the honeycomb aluminum plate (400) close to the perforated back plate (2) is 10 mm to 20 mm, and the diameter of the inscribed circle of the hexagonal holes of the honeycomb aluminum plate (400) is 2 mm to 4 mm.

5. The lightweight, non-toxic sound-absorbing decorative board according to claim 1, characterized in that: The thickness of the polyimide foam board is 30 mm to 50 mm.

6. The lightweight, non-toxic sound-absorbing decorative board according to claim 1, characterized in that: The perforated panel (1) and the perforated back panel (2) are made of stainless steel or aluminum alloy.

7. The lightweight, non-toxic sound-absorbing decorative board according to claim 1, characterized in that: The second perforations on the perforated panel (1) and the perforated back panel (2) are distributed in a rectangular array.

8. The lightweight, non-toxic sound-absorbing decorative board according to claim 7, characterized in that: The thickness of the perforated panel (1) and the perforated back panel (2) is 0.6 mm to 1.0 mm; the diameter d of the second perforation is 3 mm to 5 mm; In the length direction, the spacing between two adjacent second perforations is l1, and l1 is 4 mm to 6 mm; in the width direction, the spacing between two adjacent second perforations is l2, and l2 is 4 mm to 6 mm; In the length direction, the distance between the center of the first target perforation and the wide side is L1, and L1 is 20 mm to 30 mm; in the width direction, the distance between the center of the second target perforation and the long side is L2, and L2 is 20 mm to 30 mm; the first target perforation is the second perforation that is closest to the wide side of the perforated panel (1) and the perforated back plate (2) in the length direction; and the second target perforation is the second perforation that is closest to the long side of the perforated panel (1) and the perforated back plate (2) in the width direction.

9. The lightweight, non-toxic sound-absorbing decorative board according to claim 1, characterized in that: The long sides of the perforated panel (1) and the perforated back panel (2) are both provided with metal connecting plates (7); the two metal connecting plates (7) located on the same side enclose a receiving groove (5), and a sound absorbing block (6) is provided in the receiving groove (5).

10. The lightweight, non-toxic sound-absorbing decorative board according to claim 9, characterized in that: The metal connecting plate (7) comprises a vertical plate, a first horizontal plate connected to the perforated panel (1) or the perforated back plate (2) is provided on the top of the vertical plate, and a second horizontal plate is provided on the top of the vertical plate; When two lightweight non-toxic sound-absorbing decorative panels are connected, the vertical panels of the two lightweight non-toxic sound-absorbing decorative panels fit each other.

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