Soundproof panel

Abstract

To provide a soundproof panel having good workability and transportability by using a material available at hand while satisfying the certification standard of the Temporary Construction Industry Association.SOLUTION: The soundproof panel 10 includes a first layer 11 provided at the center and second layers 12a and 12b laminated on both sides in the thickness direction of the first layer 11, the first layer 11 and the second layers 12a and 12b have the same thickness, the first layer 11 is an acrylic plate, a PET plate, or a polycarbonate plate, and the second layers 12a and 12b are resins different from the first layer 11.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to acoustical panels. [Background technology]

[0002] A conventional soundproof panel is described, for example, in Japanese Patent Application Laid-Open No. 2019-127783 (Patent Document 1). According to this publication, the soundproof panel has a structure in which metal plates are sandwiched on both sides of a resin about 2 mm thick. Meanwhile, a soundproof panel made of a synthetic resin foam and a surface material laminated on both sides of the synthetic resin foam in the thickness direction is disclosed, for example, in Japanese Patent Application Laid-Open No. 2013-204332 (Patent Document 2). According to this publication, the soundproof panel has a structure in which surface materials including synthetic resin sheets are laminated on both sides of the foam in the thickness direction.

[0003] Furthermore, for example, Japanese Patent Application Laid-Open No. 2022-164440 (Patent Document 3) discloses a soundproof panel made of a synthetic resin plate held in a panel frame, which is used as a temporary enclosure structure at demolition work sites, etc. According to this publication, the soundproof panel is made of a single synthetic resin plate. Also, for example, Japanese Patent Application Laid-Open No. 2021-196474 (Patent Document 4) discloses a soundproof panel in which a synthetic resin honeycomb structure is sandwiched between two metal plates. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-127783 A (Abstract, etc.) [Patent Document 2] JP 2013-204332 A (Abstract, etc.) [Patent Document 3] JP 2022-164440 A (Abstract, etc.) [Patent Document 4] JP 2021-196474 A (Abstract, etc.) Summary of the Invention [Problem to be solved by the invention]

[0005] When the inventors actually measured the soundproof panel described in Patent Document 1, the weight per unit area was 4.3 kg / m. 2 Furthermore, the soundproof panel described in Patent Document 2 has a light weight per unit area, but in order to meet the certification standards of the Temporary Construction Industry Association, the foam thickness needs to be increased to about 30 mm, which also poses problems in terms of workability and transportability.

[0006] Although the soundproofing panel described in Patent Document 2 has a light weight per unit area, the foam thickness needs to be increased to about 30 mm to meet the certification standards of the Temporary Construction Industry Association, which also poses problems in terms of workability and transportability.

[0007] The soundproof panel of Patent Document 3 is made of a single synthetic resin plate, which is soft and prone to coming off when blown around by the wind.

[0008] The soundproof panel of Patent Document 4 has a problem in that the volume of the honeycomb structure is large, and a large amount of space is required for transportation and storage.

[0009] The present invention has been made to solve the above problems, and has as its object to provide a soundproof panel that is easy to work with and transport, using readily available materials. [Means for solving the problem]

[0010] The soundproof panel according to the present invention includes a first layer provided in the center and second layers laminated on both sides of the first layer in the thickness direction, the first layer being an acrylic plate, a PET plate, or a polycarbonate plate, and the second layer being a resin different from that of the first layer. Preferably, the acoustical panel has a sound transmission loss value of at least 18 dB at 500 Hz and at least 23 dB at 1000 Hz.

[0011] The second layer may be a sheet whose surface is coated with a resin.

[0012] The soundproof panel has a weight per unit area of ​​4.14 kg / m 2 Preferably, it is:

[0013] The soundproof panel may be a black transparent type. [Effects of the Invention]

[0014] According to this invention, the soundproof sheet is composed of a central acrylic, PET, or polycarbonate plate and resin plates different from the acrylic, PET, or polycarbonate plate laminated on both sides of the central acrylic, PET, or polycarbonate plate in the thickness direction. By layering materials with different sound propagation velocities (sound speeds), the effect of sound transmission loss due to sound refraction can be achieved. As a result, a soundproof panel that achieves the effect of sound transmission loss can be provided using readily available materials. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a cross-sectional view showing the configuration of a soundproof panel. [Figure 2] This is a graph showing the sound transmission loss at 500 Hz, which is in accordance with the technical standards of the Temporary Construction Industry Association. [Figure 3] This is a graph showing the sound transmission loss at 1000 Hz, which is in accordance with the technical standards of the Temporary Construction Industry Association. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view showing the configuration of a soundproof panel according to one embodiment of the present invention. Referring to Fig. 1, soundproof panel 10 has a three-layer structure consisting of a first layer 11, which is a core material provided in the center, and second layers 12a and 12b provided so as to sandwich first layer 11. Here, second layers 12a and 12b are made of the same resin.

[0017] The first layer is an acrylic, PET, or polycarbonate plate. The reason for using an acrylic, PET, or polycarbonate plate for the first layer is that these are readily available materials with a certain level of strength. The second layer is made of a different resin than the first layer. By making the second layer different from the first layer, the sound speeds of the respective materials differ, causing sound refraction and achieving the effect of sound transmission. It is preferable to use a PVC sheet for the second layer, as PVC sheets are heat resistant.

[0018] Here, the inventors have identified the following resin materials that can be used for the second layer through experiments. These are vinyl chloride #1000 (soundproof sheet), #7500 (lightweight soundproof sheet), The materials used are chlorinated polyethylene black transparent soundproofing sheet and EVA resin (ethylene-vinyl acetate copolymer resin).

[0019] Table 1 shows the material, weight, sound transmission loss certified by the Temporary Construction Industry Association, and a judgment of whether the sound transmission loss certified by the Temporary Construction Industry Association is met when the above materials are used as the first layer (core material) and second layer (front and back).

[0020] [Table 1]

[0021] In Table 1, "PVC" indicates #1000 (soundproof sheet) PVC sheet, chlorinated polyethylene indicates black transparent soundproof sheet, lightweight PVC indicates #7500 (lightweight soundproof sheet), EVA indicates EVA resin (ethylene-vinyl acetate copolymer resin), and polycarbonate indicates polycarbonate.

[0022] Next, we will explain the sound transmission loss of soundproof panels. Fig. 2 is a diagram showing the various soundproof panels tested by the inventors and shown in Table 1, along with the sound transmission loss values ​​at 500 Hz as determined by the Temporary Construction Industry Association. Fig. 3 is a diagram showing the various soundproof panels tested by the inventors and the sound transmission loss values ​​at 1000 Hz as determined by the Temporary Construction Industry Association. As shown in Figs. 2 and 3, the sound transmission loss values ​​as determined by the Temporary Construction Industry Association are 18 dB or more at 500 Hz and 23 dB or more at 1000 Hz.

[0023] Next, the experimental results will be explained with reference to Table 1 and Figs. 2 and 3. The soundproof panel was constructed as a conventional panel (surface, core, back surface) with a 3 mm resin core and aluminum surfaces on both the front and back surfaces, with a weight (areal density kg / m 2 ) is 4.14 kg / m 2 Experiments were conducted with soundproofing sheets made of the materials shown in Table 1, including those with only 1mm resin as the core material, those with 1mm resin as the core material and PVC on the surface only, those with 1mm resin as the core material and PVC on the surface and back, and those with PET as the core material and PVC sheets on the surface and back.

[0024] In Figures 2 and 3, which illustrate the results, as explained in the figures, products with PVC on the front and back and a PET core are indicated by ● (PVC + PET), products with chlorinated polyethylene (PE) on the front and back and a PET core are indicated by ◆ (chlorinated PE + PET), products with lightweight PVC on the front and back and a PET core are indicated by ▲ (PVC (lightweight) + PET), products with EVA on the front and back and a PET core are indicated by ■ (EVA + PET), products with PVC on the front and back and an acrylic core are indicated by ○, products with chlorinated polyethylene (PE) on the front and back and an acrylic core are indicated by ◇, products with lightweight PVC on the front and back and an acrylic core are indicated by △, products with EVA on the front and back and an acrylic core are indicated by □, and products with chlorinated polyethylene (PE) on the front and back and a polycarbonate core are indicated by ×.

[0025] From the above, the following conclusion can be made. Referring to Table 1, Figure 2, and Figure 3, at 500 Hz, the core material is 0.5 mm PET and the front and back surfaces are PVC (basis weight 2.93 kg / m 2 ), the core is 0.5 mm PET, and the front and back are made of chlorinated polyethylene (basis weight 2.93 kg / m 2 ), with a core of 0.5 mm acrylic and vinyl chloride on the front and back (weight 3.0 kg / m 2 ), the core is 0.5 mm acrylic and the front and back are chlorinated polyethylene (basis weight 2.91 kg / m 2 ), the core is 1.0 mm polycarbonate and the front and back are chlorinated polyethylene (basis weight 2.86 kg / m 2 ) all meet the sound transmission loss standards certified by the Temporary Construction Industry Association at both 500Hz and 1000Hz.

[0026] Furthermore, those with a PET core tend to have greater sound transmission loss than those with an acrylic core.

[0027] Next, we will explain the basis weight. In order to obtain soundproofing performance, it is most efficient to block the sound with a heavy substance. However, doing so increases the load on the scaffolding, which creates the problem that the height of the scaffolding cannot be increased during construction. As a result, if you try to construct the scaffolding at a higher level, reinforcement or the like becomes necessary, which affects the economy. Furthermore, it is clear that an increase in weight will make it difficult to transport and work with. Therefore, in this invention, the inventors considered the following.

[0028] The first column in Table 1 shows the composition of the current soundproof panel. The current soundproof panel has a 3mm resin core and aluminum on the front and back. The basis weight of the current soundproof panel is 4.14 kg / m 2 Therefore, in the present invention, in order to improve workability compared to the current soundproof panel, the weight per unit area is made smaller than that of the current soundproof panel. 2 The following is the result.

[0029] Referring to Table 1, etc., basically, lighter weight panels will not pass the test, but there are some panels that pass despite being lighter than the basis weight of current soundproofing panels, such as those with a 0.8mm or 1mm core of acrylic covered on both sides with PVC, chlorinated polyethylene or EVA, and those with a 0.8mm or 1mm core of PET covered on both sides with PVC, chlorinated polyethylene or EVA.

[0030] The weight is specified as basis weight for the following reasons: By using basis weight as a standard, the production process can be made more efficient and the amount of raw materials required can be calculated accurately. Also, by keeping the basis weight constant, the quality of the product can be stabilized.

[0031] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Industrial Applicability]

[0032] According to this invention, a soundproof panel can be provided that is easy to work with and transport, while meeting the certification standards of the Temporary Construction Industry Association, and is made from readily available materials, so that it can be advantageously used as a soundproof sheet. [Explanation of symbols]

[0033] 10 Soundproofing sheet 11 First Layer 12a, 12b Second layer

Claims

1. a centrally located first layer; a second layer laminated on both sides of the first layer in the thickness direction, The first layer is an acrylic plate, a PET plate, or a polycarbonate plate, The second layer is a different resin than the first layer.

2. 10. The acoustical panel of claim 1, wherein the acoustical panel has a sound transmission loss value of at least 18 dB at 500 Hz and at least 23 dB at 1000 Hz.

3. 3. The soundproof panel according to claim 2, wherein the second layer is a sheet the surface of which is coated with a resin.

4. The weight of the soundproof panel is 4.14 kg / m ２ 3. The acoustical panel of claim 2, wherein:

5. 2. The soundproofing panel according to claim 1, wherein the soundproofing panel is a black transparent type.

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