Acoustic article

Abstract

The present invention provides an acoustic article that takes into account a frequency correlation of acoustic performance due to high bulk density and laminated structures. [Solution] The acoustic article comprises a first member (2) in the form of a sheet made of a porous material, a first surface member (4) provided on a first main surface of the first member on one side in the thickness direction, a second member (3) in the form of a sheet made of a porous material, and a second surface layer member 6 provided on a second main surface of the second member 3 on the other side in the thickness direction. The first member and the second member are laminated, the first member and the second member being fixed to each other at least partially in a planar direction.

Description

Technical Field

[0001] The present invention relates to acoustic articles. Background Art

[0002] As an existing acoustic product, there is known an acoustic product described in Patent Document 1. For example, Patent Document 1 JP2021-500610 T discloses a member in the form of a sheet as an acoustic product, which includes, for example, a porous layer containing porous carbon. Summary of the invention

[0003] Technical issues

[0004] Here, there is a need for acoustic articles that take into account the frequency dependence of the acoustic performance due to the high bulk density and the laminated structure.

[0005] It is therefore an object of the present disclosure to provide an acoustic article that takes into account the frequency dependence of the acoustic performance due to the high bulk density and laminated structure.

[0006] Solution to the problem

[0007] An acoustic article according to one aspect of the present disclosure includes: a first member in the form of a sheet and made of a porous material; a first surface member, which is arranged on a first main surface of the first member on one side in the thickness direction; a second member in the form of a sheet and made of a porous material; and a second surface member, which is arranged on a second main surface of the second member on the other side in the thickness direction, wherein the first member and the second member are laminated and the first member and the second member are at least partially fixed to each other in a planar direction.

[0008] A method for manufacturing an acoustic article according to one aspect of the present disclosure includes: preparing a first component in the form of a sheet made of a porous material, the first component including a first surface component arranged on a first main surface of the first component; preparing a second component in the form of a sheet made of a porous material, the second component including a second surface component arranged on a second main surface of the second component; and laminating the first component and the second component, wherein the first surface component and the second surface component are positioned on the outside in the thickness direction when laminating, and the first component and the second component are at least partially fixed to each other in the planar direction.

[0009] advantage

[0010] According to the present disclosure, an acoustic article can be provided that takes into account the frequency dependence of acoustic performance due to high bulk density and laminated structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 (a) to Figure 1 (c) are each a schematic cross-sectional view of an acoustic article according to an embodiment.

[0012] Figure 2 (a) to Figure 2 (c) are each a schematic cross-sectional view of an acoustic article according to a modification.

[0013] Figure 3 (a) and Figure 3 (b) are each a schematic plan view of an acoustic article according to a modification.

[0014] Figure 4 (a) and Figure 4 (b) are each a schematic cross-sectional view of an acoustic article according to a modification.

[0015] Figure 5 (a) and Figure 5 (b) are each a schematic plan view of an acoustic article according to a modification.

[0016] Figure 6 (a) and Figure 3 (b) are each a schematic cross-sectional view of an acoustic article according to a modification.

[0017] Figure 7 (a) and Figure 7 (b) Each is a table showing test conditions.

[0018] Figure 8 (a) to Figure 8 (d) Each is a table showing test conditions.

[0019] Fig. 9 (a) and Fig. 9 (b) Each is a graph showing a test result.

[0020] Fig.10 (a) and Fig.10 (b) Each is a graph showing a test result.

[0021] Fig.11 (a) and Fig.11 (b) Each is a graph showing a test result.

[0022] Fig.12 (a) and Fig.12 (b) Each is a graph showing a test result. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0024] like Figure 1As shown in (c), the acoustic article 1 according to the embodiment includes a first member 2 and a second member 3. The first member 2 and the second member 3 are laminated in a state where they are at least partially fixed to each other in a planar direction. The "laminated" used here does not mean that the members must be completely fixed in the laminated state, but includes the following descriptions: Figure 3 and Figure 5 The state shown is that they can be separated from each other after lamination. In the present embodiment, the first member 2 and the second member 3 are fixed to each other by fusion at both edge portions in the first direction D1 parallel to the planar direction.

[0025] The acoustic article 1 has a pair of main surfaces 1a and 1b opposite to each other in the thickness direction. The pair of main surfaces 1a and 1b are provided with surface members 4, 6 each made of a nonwoven fabric. The surface members 4 and 6 are fixed to each other by fusing at two edge portions of the acoustic article 1 in the first direction D1, thereby sandwiching the first member 2 and the second member 3. The fusion is performed by one or both of pressure fusion and heat fusion. Pressure fusion is a method of performing fusion by applying pressure to each of the members 2, 3, 4 and 6. Heat fusion is a method of performing fusion by applying heat to each of the members 2, 3, 4 and 6. Fusion also includes sealing, in which a gap is filled with a filler.

[0026] like Figure 1 (a) and Figure 1 As shown in (b), before being fixed, the surface layer member 4, the first member 2, the second member 3 and the surface layer member 6 are laminated in this order to form a laminated body 10. Figure 1 As shown in (a), a first member 2 having a size L0 and a second member 3 having a size L0 are prepared, and as Figure 1 (b) They are stacked. The laminate 10 is cut into appropriate lengths at both edge portions in the first direction D1 and then fixed by fusion. This forms Figure 1(c) The acoustic article 1 shown. Note that the dimension L1 of the acoustic article 1 in the first direction D1 is smaller than the dimension L0 of the laminate 10 in the first direction D1 after cutting. The length of the main surface 1a of the acoustic article 1 when viewed from the second direction D2 parallel to the plane direction and orthogonal to the first direction D1 is substantially equal to the dimension L0. In the acoustic article 1, the first member and the second member are compressed by the tension of the surface members 4 and 6. Therefore, the thickness H1 of the acoustic article 1 is thinner than the thickness H0 of the laminate 10. The thickness is a direction orthogonal to the first direction D1 and the second direction D2. Although the dimension is not specifically limited, the dimension L1 is set to about 30 mm to 1300 mm. Although the thickness is not specifically limited, the thickness H1 is set to about 10 mm to 60 mm. In the thickness H1, the thickness of the surface members 4 and 6 is about 0.1 mm to 1 mm, and the remaining thickness is the thickness of the first member 2 and the second member 3. The thickness of the first member 2 and the thickness of the second member 3 may be equal to each other, but may also be different from each other. If different, the thickness of the first member 2 may be in the range of 10% to 1000% relative to the thickness of the second member 3 .

[0027] Next, each component will be described in detail.

[0028] Second component

[0029] The second member 3 is a member in the form of a sheet made of a porous material. The second member 3 may include a porous layer and at least one filler dispersed in the porous layer. The second member 3 includes an air gap adjacent to the porous layer. For example, the second member 3 may include a porous layer and a non-uniform filler, the non-uniform filler comprising porous particles and having a size of 0.1 m 2 / g and above 10000m 2 / g or less, and the second member 3 may have an airflow resistance value of 100 MKS Rayleigh or more and 5000 MKS Rayleigh or less. As porous particles, porous carbon may also be used. For example, the second member 3 may include a porous layer and a non-uniform filler received by the porous layer, the non-uniform filler having an average particle size of 1 μm or more and 1000 μm or less, and having a particle size of 0.1 μm or less. 2 / g and above 800m 2 / g or less, and the second member 3 may have an airflow resistance value of 100 MKS Rayleigh or more and 8000 MKS Rayleigh or less. As the second member 3, 3M (trade name) flexible acoustic material FAB series (manufactured by 3M Company) or the like can be used.

[0030] The second member 3 comprises one or more porous layers. Useful porous layers include, but are not limited to, nonwoven fiber layers, perforated films, particle beds, open-cell foams, fiberglass, meshes, woven fabrics, and combinations thereof.

[0031] Nonwoven fiber layers designed to contain fine fibers can be effective acoustic absorbers in aerospace applications, automotive applications, transportation applications, and construction applications. Nonwoven materials with multiple fine fibers can be particularly effective at high sound frequencies, where the high surface area of ​​the structure is a mechanism that promotes viscous dissipation of acoustic energy. The nonwoven layer can be made of glass fiber. Polymer nonwoven layers can be made, for example, by meltblowing or melt spinning.

[0032] In meltblowing, one or more thermoplastic polymer streams are extruded through a die comprising closely arranged orifices, and are attenuated and formed into fine fibers by the converging streams of hot air at high speed. Meltblown nonwoven fiber layers can be provided by collecting these fine fibers on the surface. According to selected operating parameters, for example, the degree of solidification from the molten state, the collected fibers can be semi-continuous or substantially discontinuous. In certain exemplary embodiments, meltblown fibers of the present disclosure can be oriented at the molecular level. Fibers can be interrupted by defects in the melt, the crossing of the filaments formed, the excessive shearing caused by the turbulence for reducing the fiber diameter, or other events occurring during the formation process. It has been found that these fibers are typically semi-continuous or have a length much longer than the distance between the fiber entanglements, and therefore a single fiber cannot be removed as is from the fiber block end to end.

[0033] In melt spinning, nonwoven fibers are extruded from a series of orifices as filaments and cooled and solidified to form fibers. The filaments are passed through an air space that may include a moving air stream, the filaments are cooled and passed through a diameter reduction (i.e., stretching) unit, and at least a portion of the filaments are stretched. The fibers prepared by the melt spinning method may be "spunbonded", whereby a web containing a group of melt-spun fibers is collected as a fiber web and optionally subjected to one or more bonding operations to fuse the fibers together. Melt-spun fibers typically have a larger diameter than melt-blown fibers.

[0034] The fiber can be made of a polymer selected from polyolefins, polypropylene, polyethylene, polyester, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyurethane, polybutene, polylactic acid, polyphenylene sulfide, polysulfone, liquid crystal polymer, ethylene-vinyl acetate copolymer, polyacrylonitrile, cyclic polyolefin, or copolymers or blends thereof, the amount of the polymer being at least 35% by weight of the total weight of the plurality of fibers. Suitable fiber materials also include elastomeric polymers.

[0035] First component

[0036] The first component 2 is a component in the form of a sheet made of a porous material. The first component 2 can be a non-woven fabric component having high sound absorption and heat insulation properties by being composed of a superfine fiber group and containing air between complexly entangled fibers. As the first component 2, for example, 3M (trademark name) Thinsulate (trademark name) sound insulation TF series, SF series (manufactured by 3M Company), etc. are used. For example, the first component 2 is a component obtained by mixing PP meltblown fibers and PET staple fibers. As the material of the fiber of the first component 2, for example, the fibers described in paragraph 0020, felt, glass wool, etc. are used. The first component 2 alone has properties such as sound absorption and heat insulation.

[0037] Surface components

[0038] The surface members 4 and 6 are sheet members made of nonwoven fabrics. Materials such as meltblown nonwoven fabrics and spunbonded nonwoven fabrics are used. In addition, as the material of the fiber of the surface members 4 and 6, for example, the fiber described in paragraph 0020 can be used, and PP, PET, cellulose, etc. are particularly used. The surface members 4 and 6 have higher water resistance and shape retention than the first member 2 and the second member 3, and have the function of protecting the first member 2 and the second member 3. Unlike the first member 2 and the second member 3, the surface members 4 and 6 have the characteristics of high tear strength.

[0039] Next, the operation and effects of the acoustic article 1 according to the present embodiment will be described.

[0040] The acoustic article 1 includes a first member 2 in the form of a sheet made of a porous material, a first surface member 4 provided on a first main surface on one side of the first member in the thickness direction, a second member 3 in the form of a sheet made of a porous material, and a second surface member 6 provided on a second main surface on the other side of the second member 3 in the thickness direction. According to this configuration, the combination of the first member 2 and the second member 3 can be adjusted to have a structure suitable for placement and situations to be applied. Therefore, an acoustic article 1 can be provided that takes into account the frequency dependence of acoustic performance due to a high bulk density and a laminated structure.

[0041] In another embodiment, the first member 2 and the second member 3, each having advantages different from each other, can be combined, and in this case, the acoustic performance can be improved while suppressing the thickness and cost, compared with the case where the thickness and cost of a single member are increased. For example, the second member 3 may have the advantage of having good acoustic performance at low to medium frequencies even if it is thin. The first member 2 may have the advantage of effectively absorbing a wide range of medium to high frequency sounds. If an acoustic performance comparable to that of the present embodiment is obtained only by increasing the thickness of a single member, the increase in thickness and cost will exceed the requirements. The first member and the second member are laminated in a state where they are at least partially fixed to each other in a planar direction. Therefore, the acoustic product can be distributed while maintaining the combination or positional relationship of the members for obtaining the desired acoustic performance.

[0042] The acoustic article 1 has a four-layer structure. The acoustic article 1 may be made entirely of porous materials, and the surface members 4 and 6 are not necessarily made of porous materials. In the acoustic article 1, only the first member 2 and the second member 3 in the four-layer structure are required to be porous materials.

[0043] In the acoustic article 1 according to the present embodiment, acoustic performance corresponding to a wide frequency band can be obtained. In addition, in the acoustic article 1 according to the present embodiment, acoustic performance dedicated to automobiles can be obtained.

[0044] The performance in a wide frequency band can be improved by the difference in acoustic impedance (properties of the members) between the first member 2 and the second member 3. By simply increasing the thickness of a single member, the sound is easily absorbed but the acoustic impedance does not change much.

[0045] The second component 3 may have a filler including porous particles.

[0046] The first member 2 and the second member 3 may be fixed to each other by fusing at both edge portions in the first direction D1 parallel to the planar direction. In this case, they can be fixed more firmly than when fixed with a tape or the like.

[0047] The acoustic article 1 may have the pair of main surfaces 1a and 1b opposite in the thickness direction, and the pair of main surfaces 1a and 1b may be provided with surface members 4 and 6 made of nonwoven fabric, respectively. In this case, the acoustic article 1 can be protected from both sides by the surface members 4 and 6.

[0048] The present disclosure is not limited to the above-described embodiments.

[0049] For example, Figure 2As shown in (c), the acoustic article 1 may have a pair of main surfaces 1a and 1b facing each other in the thickness direction, and one main surface is longer than the other main surface when viewed from a second direction D2 that is parallel to the plane direction and orthogonal to the first direction D1. Figure 2 In the example shown in (c), the main surface 1a is longer than the main surface 1b. The dimension L1 of the surface layer member 4 and the first member 2 when viewed from the second direction is longer than the dimension L0 of the surface layer member 6 and the second member 3. Figure 2 As shown in (a), a first member 2 having a size L1 and a second member 3 having a size L0 are prepared, and Figure 2 As shown in (b), the two edge portions of the first member 2 are aligned with the two edge portions of the second member 3. Then, as Figure 2 As shown in (b), in the state of the laminate 10, the surface layer member 4 and the first member 2 are in a relaxed state. When the two edge portions of the laminate 10 are fixed by fusion, a Figure 2 (c) The acoustic article 1 shown. Since the surface member 4 and the first member 2 are long, the acoustic article 1 has a shape that greatly expands outward in the thickness direction D3. At this time, the length of the main surface 1a viewed from the second direction D2 is substantially equal to the dimension L1. The thickness H2 of the acoustic article 1 becomes larger than Figure 1 (c) shows a thicker thickness H1. As described above, a thick acoustic article 1 can be obtained.

[0050] There is no particular limitation on which of the main surface 1a and the main surface 1b is thickened, and the main surface 1b may be longer than the main surface 1a. In this case, in the state of the laminate 10, the surface layer member 6 and the second member 3 are longer than the surface layer member 4 and the first member 2.

[0051] For example, Figure 3 As shown, the first member 2 and the second member 3 are fixed to each other at their first edge portions 2a and 3a in the first direction D1 parallel to the plane direction, and can be separated from each other at the second edge portions 2b and 3b. Figure 3 As shown in (a), the first member 2 and the second member 3 are fixed to each other on the sides of the first edge portions 2a and 3a by the belt member 9. On the other hand, the second edge portion 2b of the first member 2 and the second edge portion 3b of the second member 3 are not fixed and can be separated from each other when the product is dispensed. Figure 4 The state in which the first member 2 and the second member 3 are opened as shown in (a) is similar to that in Figure 4(b) The first member 2 and the second member 3 are laminated. Here, the first member 2 has a fixing tape member 8 on the side of the second edge portion 2b. When dispensed, the adhesive surface of the fixing tape member 8 is covered with a pad. On the other hand, when the acoustic article is attached to an attachment target location (such as an automobile part), as shown in FIG. Figure 3 As shown in (b), the cushion is removed, and the second edge portion 2 b side of the first member 2 and the second edge portion 3 b side of the second member 3 are fixed via the fixing tape member 8 .

[0052] As described above, the first member 2 and the second member 3 are fused to each other at the first edge portions 2a and 3a in the first direction D1, and can be separated from each other at the second edge portions 2b and 3b. Figure 1 In the form shown in (c), the thickness of the acoustic article 1 is reduced by fusing and fixing the two edge portions. On the other hand, when attached to the attachment target portion, Figure 4 The acoustic article 1 shown in (b) can be attached in a state where a reduction in thickness is suppressed.

[0053] The first member 2 and the second member 3 are fixed to each other at the first edge portions 2a and 3a in the first direction D1 using the tape member 9, and can be separated from each other at the second edge portions 2b and 3b. In this case, both the members 2 and 3 can be easily fixed by using the tape member 9. Using the tape member 9 makes it possible to suppress the thickness of the acoustic article 1 from becoming thinner also on the sides of the first edge portions 2a and 3a.

[0054] like Figure 4 As shown in (b), the pair of main surfaces 1a, 1b are provided with surface members 4, 6 made of nonwoven fabric, respectively. In this case, the main surfaces 1a and 1b on the outer sides in the thickness direction D3 of the fixed acoustic article 1 can be protected.

[0055] A surface member 7 made of nonwoven fabric is provided between the first member 2 and the second member 3. In this case, either one of the members 2 and 3 (here, the second member 3) can be protected in a state where the first member 2 and the second member 3 are opened.

[0056] There is no specific limitation on how to fix the first member 2 and the second member 3 to the side surfaces of the first edge portions 2a and 3b. Figure 4 The configuration shown. Figure 5 As shown in (b), on the side of the first edge portions 2a and 3a, the first member 2 can be fixed to the second member 3 at the fusion portion 11. In this case, the members 2 and 3 can be firmly fixed to each other at the fusion portion 11. Note that Figure 5 Other configurations of the acoustic article 1 shown in FIG. Figure 3 The configuration in .

[0057] The method for fixing the first member 2 and the second member 3 is not limited to fusion and tape members. Figure 6 As shown, the acoustic article 1 may further include a pin member 20 for fixing the first member 2 and the second member 3 to each other. The pin member 20 has a body 21 penetrating the first member 2 and the second member 3 in the thickness direction D3 and head sections 22, 23 formed at two edge portions of the body 21, respectively. Figure 6 In the acoustic product 1 of (a), since the member is partially fixed by the pin member 20, the overall thickness can be suppressed. Figure 1 (c) is thinned as in the acoustic product 1.

[0058] The pair of main surfaces 1a, 1b are provided with surface members 4, 6 made of nonwoven fabric, respectively. On the other hand, the head sections 22, 23 are positioned outside in the thickness direction D3 relative to the surface members 4 and 6. Thus, the head sections 22, 23 press the surface members 4 and 6 with a higher strength than the members 2 and 3. Therefore, as Figure 6 As shown in (b), the head sections 22 and 23 can be suppressed from being caught in the fibers, and the holding force can be transmitted to the entire periphery of the contact portion with the surface layer members 4 and 6.

[0059] The main body 21 has a cylindrical shape extending in the thickness direction D3. The head segments 22 and 23 serve as locking pieces, which extend horizontally from the main body 21 within a certain angle range (for example, 45° to 135°) at the two edge portions of the main body 21 or in the middle of the main body. The length LG of the main body 21 is equal to or less than the total thickness of the material of the joining target (here, the total thickness H0 of the components 4, 2, 3 and 6). The width W, number and material of the head segments 22 and 23 are set to the condition that the head segments 22 and 23 do not penetrate the non-woven fabric of the surface layer components 4 and 6. Figure 6 In the example shown, the head sections 22, 23 are constructed by one member extending in one direction orthogonal to the thickness direction D3, but the head sections 22 and 23 may be constructed by a plurality of members extending in a plurality of directions. The width W of the head sections 22, 23 is set to such a size that the head sections can be joined without penetrating between the fiber gaps of the nonwoven fabrics of the surface members 4 and 6. The shape of the head sections 22, 23 is not particularly limited, and may be a trapezoidal shape as in the head section 22, or may be a rod shape as in the head section 23. The pin member 20 may be made of resin. For example, nylon, PET, etc. may be used as the resin.

[0060] Acoustic performance test

[0061] Next, refer to Figures 7 to 12Describe the acoustic performance test. First, prepare Figure 7 (a) and Figure 7 (b) Samples 1 to 5 as a single material. Samples 1, 2 and 3 correspond to the above-mentioned second member, and Samples 4 and 5 correspond to the above-mentioned first member. In Samples 1, 2 and 3, porous carbon is dispersed as a filler in the porous sheet-shaped member. Next, a porous sheet-shaped member is prepared using Figure 8 (a) Comparative Examples 1 to 5 of Samples 1 to 5 shown. The reverberation sound absorption coefficients of Comparative Examples 1 to 5 were measured. The measurement was tested according to JIS A1409 "Method for measurement of sound absorption coefficients in a reverberation room". The sound absorption coefficient measurement system (400 Hz to 5 kHz) "AbLoss" available from Nihon Onkyo Engineering Co., Ltd. was used. The sound insulation of Comparative Examples 1 to 5 was measured. The measurement was performed according to JIS A 1441-1 "Measurement of sound insulation in buildings and of building elements using sound intensity". The sound insulation measurement system (400 Hz to 5 kHz) "AbLoss" available from Nihon Onkyo Engineering Co., Ltd. was used. The measurement results are shown in Table 1. Fig. 9 As shown in FIG. 1 , the sound incident surface of the corresponding comparative example and the corresponding embodiment in the acoustic performance test is the incident surface of the single-layer product on the surface member side of the first layer. Figure 8 The sample described on the left side of the sample mark in the table is the incident surface. For example, Example 10 is described as "Sample 1+2", but Sample 1 described on the left side is the incident surface.

[0062] For Figure 8 The reverberation sound absorption coefficient and sound insulation value were measured for the embodiments 10 and 11 in which two layers of the second member were stacked as shown in (b). Fig.10 As shown in Figure 8 The reverberation sound absorption coefficient and the sound insulation were measured for the embodiments 1 to 4 and 10 in which the first member and the second member were superimposed as shown in (c). Fig.11 As shown in Figure 8 The reverberation sound absorption coefficient and the sound insulation were measured for Example 5 in which one layer of the first member and two layers of the second member were stacked as shown in (d) and Examples 6 to 9 in which two layers of the first member and one layer of the second member were stacked. Fig.12Shown in.

[0063] The present disclosure is not limited to the above-described embodiments.

[0064] For example, the shape of each sheet member and the like are not particularly limited and can be modified appropriately. The number, order, and the like of each layer can be changed appropriately.

[0065] There is no specific limitation on the combination of the first member and the second member. For example, the combination of "first member: 3M (trade name) Thinsulate (trade name) sound insulation material (manufactured by 3M Company), second member: 3M (trade name) flexible acoustic material FAB series (manufactured by 3M Company)" has been exemplified as an example of the combination, but the combination of "first member: 3M (trade name) flexible acoustic material FAB series (manufactured by 3M Company), second member: 3M (trade name) flexible acoustic material FAB series (manufactured by 3M Company)" may be adopted, the combination of "first member: 3M (trade name) flexible acoustic material FAB series (manufactured by 3M Company), second member: 3M (trade name) Thinsulate (trade name) sound insulation material (manufactured by 3M Company)" may be adopted, or the combination of "first member: 3M (trade name) Thinsulate (trade name) sound insulation material (manufactured by 3M Company), second member: 3M (trade name) Thinsulate (trade name) sound insulation material (manufactured by 3M Company)" may be adopted.

[0066] Reference numerals list

[0067] 1...Acoustic products

[0068] 2...First component

[0069] 3...Second component

[0070] 4, 6, 7...Surface components

[0071] 8, 9...with components

[0072] 20...Pin components

[0073] 21...Main body

[0074] 22, 23...Head section

Claims

1. An acoustic product, comprising: a first member in sheet form and comprising a porous material; a first surface layer member provided on a first main surface on one side in a thickness direction of the first member; a second member in sheet form and comprising a porous material; and a second surface layer member provided on a second main surface on the other side in the thickness direction of the second member, Wherein the first member and the second member are laminated, the first member and the second member are at least partially fixed to each other in a planar direction.

2. The acoustic article of claim 1, wherein the second member comprises a filler comprising porous particles. 3 . The acoustic article according to claim 1 , wherein the first member and the second member are fixed to each other by fusion at both edge portions thereof in a first direction parallel to the planar direction.

4. The acoustic article of claim 3, wherein the first major surface is longer than the second major surface when viewed from a direction parallel to the planar direction and orthogonal to the first direction. 5 . The acoustic article according to claim 1 , wherein the first member and the second member are fused to each other at first edge portions thereof in a first direction parallel to the planar direction, and are separable from each other at second edge portions thereof.

6. The acoustic article according to claim 1, wherein the first member and the second member are fixed to each other with a tape member at their first edge portions in a first direction parallel to the planar direction, and are separable from each other at their second edge portions.

7. The acoustic article according to claim 5, wherein a surface member including a nonwoven fabric is provided between the first member and the second member.

8. The acoustic article according to claim 6, wherein a surface member including a nonwoven fabric is provided between the first member and the second member.

9. The acoustic article of claim 1, further comprising a pin member securing the first member and the second member to each other, Wherein the pin member comprises: a main body, the main body penetrating the first member and the second member in a thickness direction; and Head sections are each formed at two edge portions of the main body.

10. A method of manufacturing an acoustic article, the method comprising: preparing a first member in the form of a sheet comprising a porous material, the first member including a first surface member disposed on a first major surface of the first member; preparing a second member in the form of a sheet comprising a porous material, the second member including a second surface member disposed on a second major surface of the second member; as well as The first member and the second member are laminated so that the first surface layer member and the second surface layer member are positioned on the outer side in the thickness direction when laminated, and the first member and the second member are at least partially fixed to each other in the planar direction.

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