Laminated Panel

Abstract

To provide a laminate panel that can achieve both of sound absorptivity and incombustibility.SOLUTION: A laminate panel 1 comprises a porous layer 2, and a first metal layer 31. The porous layer 2 comprises a first face 21 and a second face 22 opposite the first face 21. The porous layer 2 has an air permeability of 0.28 cm3 / cm2 / sec or more and 50 cm3 / cm2 / sec or less. The first metal layer 31 is disposed on the first face 21 of the porous layer 2, has a percentage of opening area of 0.5% or more and 50% or less, and includes a through-hole 310 with a pore size D1 of 2000 μm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates generally to laminate panels, and more particularly to laminate panels including porous layers. [Background technology]

[0002] Patent Document 1 discloses a non-flammable sound-absorbing foam. This non-flammable sound-absorbing foam contains, in a base polymer constituting the foam, one or more organic high-damping agents selected from compounds having a benzothiazyl group, compounds having a benzotriazole group, compounds having a diphenylacrylate group, and compounds having a benzophenone group. Furthermore, a surface layer made of a metal layer or the like is provided on one surface of the foam.

[0003] On the other hand, Patent Document 2 discloses a soundproof covering material. This soundproof covering material comprises a first porous film, one or more elastic porous layers, and a second porous film laminated in this order. The first porous film and the second porous film have an open pore ratio of 0.1 to 5.0% and an open pore diameter of 100 to 1000 μm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-218797 [Patent Document 2] Japanese Patent Application Publication No. 2019-008160 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is room for improvement in the sound absorbing properties of the non-flammable sound absorbing foam of Patent Document 1. On the other hand, the soundproof covering material of Patent Document 2 has the problem of low non-flammability.

[0006] An object of the present disclosure is to provide a laminated panel that can achieve both sound absorption and non-combustibility. [Means for solving the problem]

[0007] A laminated panel according to one embodiment of the present disclosure includes a porous layer and a first metal layer. The porous layer has a first surface and a second surface opposite to the first surface, and has an air permeability of 0.28 cm 3 / cm 2 / sec or more 50cm 3 / cm 2 The first metal layer is disposed on the first surface of the porous layer and has through-holes with an area ratio of 0.5% to 50% and a pore size of 2000 μm or less. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to achieve both sound absorption and non-flammability. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic cross-sectional view showing a laminated panel according to a first embodiment. [Figure 2] FIG. 2 is a view showing a part of one surface of the laminated panel. [Figure 3] FIG. 3 is a schematic cross-sectional view showing a laminated panel according to the second embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view showing a laminated panel according to a third embodiment. [Figure 5] FIG. 5 is a schematic cross-sectional view showing a laminated panel according to a fourth embodiment. [Figure 6] Fig. 6A is a schematic cross-sectional view showing a laminated panel according to a fifth embodiment, and Fig. 6B is a schematic cross-sectional view showing a laminated panel according to a modified example of the fifth embodiment. [Figure 7] Fig. 7A is a schematic cross-sectional view showing a laminated panel according to a sixth embodiment, and Fig. 7B is a schematic cross-sectional view showing a laminated panel according to a modified example of the sixth embodiment. [Figure 8]FIG. 8 is a schematic cross-sectional view showing a sound pressure measuring device. DETAILED DESCRIPTION OF THE INVENTION

[0010] 1. Overview The laminated panel 1 according to this embodiment is used, for example, for the ceilings and walls of buildings. Buildings include small buildings and large buildings. Small buildings include, but are not limited to, homes and offices. Large buildings include, but are not limited to, gymnasiums, halls, shopping malls, factories, schools, and the like.

[0011] The laminate panel 1 is attached to a base such as a light-gauge steel frame (LGS) as a ceiling panel or wall panel, for example. As described above, the laminate panel 1 is required to have sound absorption properties and non-combustibility because it is used in various buildings.

[0012] However, as mentioned above, the non-flammable sound-absorbing foam of Patent Document 1 has room for improvement in terms of sound absorption. Its sound absorption is particularly poor in the low-frequency range. The inventors believe that one of the reasons for this is the skin layer, which is made of a metal layer or the like, provided on one surface of the non-flammable sound-absorbing foam.

[0013] On the other hand, the soundproof covering material of Patent Document 2 has a problem of low non-combustibility. The present inventors believe that one of the causes of this problem lies in the first porous film and the second porous film laminated on both sides of one or more elastic porous layers.

[0014] Therefore, the present inventors have continued their intensive research to achieve both sound absorption and non-combustibility, and as a result have developed the following laminated panel 1.

[0015] That is, the laminated panel 1 according to this embodiment includes a porous layer 2 and a first metal layer 31 (see FIG. 1). The porous layer 2 has a first surface 21 and a second surface 22 opposite to the first surface 21, and has an air permeability of 0.28 cm 3 / cm 2 / sec or more 50cm 3 / cm2 / sec or less. The first metal layer 31 is disposed on the first surface 21 of the porous layer 2, and has through-holes 310 with an area ratio of 0.5% or more and 50% or less and a pore diameter D1 of 2000 μm or less.

[0016] In this way, the porous layer 2 has a predetermined air permeability, and the first metal layer 31 has through-holes 310 with a predetermined porosity and a predetermined hole diameter D1, which can mainly impart sound absorption properties to the laminated panel 1. Furthermore, the first metal layer 31 is disposed on the surface of the porous layer 2, which can mainly impart non-combustibility to the laminated panel 1.

[0017] Therefore, according to this embodiment, it is possible to achieve both sound absorption and non-combustibility.

[0018] 2.Details (1) First embodiment The laminated panel 1 according to the first embodiment will be described below with reference to the drawings. For convenience of explanation, mutually orthogonal X-axis, Y-axis, and Z-axis are illustrated, but these do not represent physical entities. The thickness direction of the laminated panel 1 is the Z-axis direction. In this specification, viewing from the Z-axis direction is referred to as a plan view. In plan view, the laminated panel 1 has a rectangular shape extending in the X-axis direction and the Y-axis direction. In this case, the lengths of the sides of the laminated panel 1 in the X-axis direction and the Y-axis direction are not particularly limited, but are, for example, 0.3 m or more and 2.0 m or less. The lengths of the sides in the X-axis direction and the Y-axis direction may be the same or different.

[0019] As shown in FIG. 1, the laminated panel 1 includes a porous layer 2 and a first metal layer 31.

[0020] <Porous layer> The porous layer 2 is a layer having a large number of cells. The cells include open cells and closed cells. The porous layer 2 of the laminated panel 1 according to this embodiment is a layer having at least open cells.

[0021] Here, open cells are cells in which multiple fine pores are connected and exist continuously. Open cells are advantageous from the viewpoints of sound absorption and flexibility. When the porous layer 2 has open cells, sound incident on the porous layer 2 is diffused within the open cells, and much of the energy of the incident sound is lost as heat energy, reducing the amount of sound reflected from the porous layer 2.

[0022] On the other hand, closed cells are microscopic pores that are not connected to each other and exist independently. Closed cells are advantageous in terms of heat insulation and rigidity.

[0023] The porous layer 2 includes at least one of a foamed resin layer and a fiber layer.

[0024] The foamed resin layer is not particularly limited, but examples thereof include plastic foams such as polyurethane foam, polyethylene foam, polypropylene foam, polystyrene foam, phenolic resin foam, melamine resin foam, and polyvinyl chloride foam.

[0025] Among the foamed resin layers listed above, polyurethane foam is particularly preferred because it is easy to obtain a porous layer 2 with the desired breathability, it has self-adhesive properties, and it is advantageous in terms of cost.

[0026] Polyurethane foams are classified into flexible, semi-rigid, and rigid polyurethane foams. These can be distinguished, for example, as follows: A force is applied to a polyurethane foam until its thickness changes, and then the force is removed. Flexible polyurethane foams return to their original thickness. On the other hand, semi-rigid and rigid polyurethane foams do not return to their original thickness. Semi-rigid polyurethane foams are intermediate materials between flexible and rigid polyurethane foams. Therefore, semi-rigid polyurethane foams return to a thickness closer to their original thickness than rigid polyurethane foams.

[0027] Among soft urethane foam, semi-rigid urethane foam, and hard urethane foam, semi-rigid urethane foam and hard urethane foam are preferred. This is because semi-rigid urethane foam and hard urethane foam are less likely to change thickness when a small force is applied, making it less likely to cause scratches such as dents on layers other than the porous layer 2 (the first metal layer 31 in this embodiment). Furthermore, semi-rigid urethane foam and hard urethane foam are less likely to lose their shape than soft urethane foam, making it easier to process the outer peripheral edge of the laminated panel 1. Furthermore, semi-rigid urethane foam and hard urethane foam are easier to handle than soft urethane foam.

[0028] On the other hand, the fiber layer is a layer containing at least one of synthetic fibers, biodegradable fibers, natural fibers, inorganic fibers, low-melting-point thermoplastic fibers, and recycled fibers.

[0029] The synthetic fibers are not particularly limited, but examples thereof include polyester fibers, polyethylene fibers, polypropylene fibers, polyamide fibers, acrylic fibers, urethane fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, and acetate fibers.

[0030] Biodegradable fibers (polylactic acid fibers) are not particularly limited, but examples include fibers containing starch extracted from plants such as corn and sugarcane.

[0031] The natural fibers are not particularly limited, but examples thereof include pulp, cotton, palm fiber, hemp fiber, bamboo fiber, and kenaf fiber.

[0032] The inorganic fibers are not particularly limited, but examples thereof include glass fibers, carbon fibers, and ceramic fibers.

[0033] The low-melting thermoplastic fiber is not particularly limited as long as it has a melting point of 180° C. or less, and examples thereof include polyolefin fibers, polyvinyl chloride fibers, polyurethane fibers, polyester fibers, polyester copolymer fibers, polyamide fibers, and polyamide copolymer fibers. The polyolefin fibers are not particularly limited as long as they have a melting point of 180° C. or less, and examples thereof include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethylene-ethyl acrylate copolymer.

[0034] The recycled fibers are not particularly limited, but examples include fibers obtained by defibrating scraps of textile products that use at least one of the above-mentioned synthetic fibers, biodegradable fibers, natural fibers, inorganic fibers, and low-melting-point thermoplastic fibers.

[0035] The fiber layer can be formed, for example, by entangling and bonding at least one of the fibers listed above by needle punching.

[0036] From the viewpoint of non-combustibility, the porous layer 2 may contain a flame retardant. The flame retardant is not particularly limited, but examples thereof include inorganic flame retardants, phosphorus-based flame retardants, and halogen-based flame retardants.

[0037] As shown in FIG. 1 , the porous layer 2 has a first surface 21 and a second surface 22. The first surface 21 faces in the negative direction of the Z axis. The second surface 22 is the surface opposite the first surface 21. The second surface 22 faces in the positive direction of the Z axis. For example, when the laminated panel 1 is used as a ceiling panel, the first surface 21 faces downward and the second surface 22 faces upward. When the laminated panel 1 is used as a wall panel, the first surface 21 faces the indoor side and the second surface 22 faces the outdoor side.

[0038] In this embodiment, the porous layer 2 has a predetermined air permeability. Here, the air permeability of the porous layer 2 means the air permeability determined by Method A (Fragile method) specified in JIS L 1096 Air Permeability. Specifically, in this embodiment, the air permeability of the porous layer 2 is 0.28 cm3 / cm 2 / sec or more 50cm 3 / cm 2 / sec or less, preferably 0.5cm 3 / cm 2 / sec or more 40cm 3 / cm 2 / sec or less, preferably 0.5cm 3 / cm 2 / sec or more 30cm 3 / cm 2 / sec or less.

[0039] The air permeability of the porous layer 2 is 0.28 cm 3 / cm 2 If the porosity is less than / sec, there is a risk of a decrease in the sound absorption of the laminated panel 1. The reason for the decrease in sound absorption is thought to be that the total volume of the air bubbles in the entire porous layer 2 is too small, and the sound incident on the porous layer 2 is not sufficiently diffused within the porous layer 2.

[0040] On the other hand, the air permeability of the porous layer 2 is 50 cm 3 / cm 2 / sec, there is a risk of a decrease in the sound absorption of the laminated panel 1. This is thought to be because the total volume of the air bubbles in the entire porous layer 2 is too large, and sound incident on the porous layer 2 is more likely to penetrate the porous layer 2 than to diffuse within the porous layer 2.

[0041] In this embodiment, the surface density (apparent density or bulk density) of the porous layer 2 is the surface density per unit area (1 m ) of the porous layer 2 in plan view. 2 The surface density of the porous layer 2 is preferably 10 kg / m 2 More than 60kg / m 2 Less than or equal to 20 kg / m 2 More than 40kg / m 2 The following is the result.

[0042] The surface density of the porous layer 2 is 10 kg / m 2By setting the surface density of the porous layer 2 at 60 kg / m or more, the sound absorption of the laminated panel 1 can be improved. Furthermore, the strength of the laminated panel 1 can be ensured. 2 When the surface density of the porous layer 2 is 10 kg / m or less, it is possible to impart lightness to the laminated panel 1. 2 More than 60kg / m 2 By satisfying the following, it is possible to impart sound absorption properties and light weight to the laminated panel 1 while ensuring strength.

[0043] <First metal layer> The first metal layer 31 is a layer containing a metal. The metal is not particularly limited, but examples thereof include aluminum, stainless steel (SUS), iron, copper, silver, nickel, and titanium.

[0044] The first metal layer 31 is disposed on the first surface 21 of the porous layer 2. Specifically, the first metal layer 31 is directly or indirectly bonded to the first surface 21 of the porous layer 2. Note that the phrase "the first metal layer 31 is indirectly bonded to the first surface 21 of the porous layer 2" means that a member other than these may be interposed between the first metal layer 31 and the first surface 21 of the porous layer 2. The member is not particularly limited, but examples include a first glass fiber layer 41 (see FIG. 4) described below, an adhesive, and the like.

[0045] When adhering the first metal layer 31 to the first surface 21 of the porous layer 2, any of an adhesive, a pressure-sensitive adhesive, and an adhesive tape may be used. The adhesive is not particularly limited, but examples thereof include hot melt adhesives. The adhesive may be in the form of, but examples thereof include liquids, powders, and films. The adhesive tape is not particularly limited, but examples thereof include double-sided tape.

[0046] Furthermore, when adhering the first metal layer 31 to the first surface 21 of the porous layer 2, it is not necessary to use any adhesive, pressure-sensitive adhesive, or adhesive tape. Examples of adhesion methods that do not use adhesives include a method using a self-adhesive foam material and a frame lamination method. These methods are preferable because they are simple and do not use adhesives.

[0047] A method using a self-adhesive foam material will be described. The self-adhesive foam material is a material that can exhibit self-adhesive properties during foam molding or the like. Examples of self-adhesive foam materials include, but are not limited to, polyurethane. By foaming the self-adhesive foam material so that it contacts the surface of the first metal layer 31, the porous layer 2 can be formed and the first metal layer 31 can be bonded to the first surface 21 of the porous layer 2.

[0048] The flame lamination method is described below. In this method, the porous layer 2 is first formed, then the first surface 21 of the porous layer 2 is heated with a flame, and the first metal layer 31 is placed on the molten first surface 21 and bonded (welded).

[0049] Unlike the methods using adhesives or the frame lamination method, the method using the self-adhesive foam material described above does not require processing such as applying adhesives or heating with a flame. Furthermore, compared to the methods using adhesives or the frame lamination method, the method using the self-adhesive foam material can reduce the time difference between forming the porous layer 2 and bonding the porous layer 2 and the first metal layer 31. Therefore, the method using the self-adhesive foam material is more preferable than the methods using adhesives or the frame lamination method.

[0050] 2, the first metal layer 31 has a plurality of through holes 310. The through holes 310 are holes that penetrate the first metal layer 31 in the thickness direction. In this way, the first metal layer 31 has the through holes 310, which can impart sound absorbing properties to the laminated panel 1.

[0051] In this embodiment, the multiple through holes 310 are arranged in a rectangular lattice pattern in the XY plane. That is, the multiple through holes 310 are arranged at a constant pitch Px in the X-axis direction and at a constant pitch Py in the Y-axis direction. The pitch Px and the pitch Py are the center-to-center distances between adjacent through holes 310 in the X-axis direction and the Y-axis direction, respectively. The pitch Px and the pitch Py may be the same or different. Note that the arrangement of the multiple through holes 310 in the XY plane is not limited to a rectangular lattice pattern, and other patterns such as a houndstooth pattern may be used.

[0052] In this embodiment, the through-holes 310 have a circular shape in plan view, but may have a shape other than a circle. Shapes other than a circle are not particularly limited, and examples thereof include an ellipse, a rounded rectangle, and a polygon. The shapes of the multiple through-holes 310 in plan view may be uniform (see FIG. 2 ), or may not be uniform.

[0053] The diameter D1 of through hole 310 means the diameter if through hole 310 has a circular shape in plan view, and means the maximum across length if through hole 310 has a shape other than a circle in plan view. Note that if through hole 310 has a shape other than a circle in plan view, its center means the midpoint of the maximum across length.

[0054] In this embodiment, the hole diameter D1 of the through holes 310 is 2000 μm (2 mm) or less, preferably 10 μm or more and 1500 μm or less, and more preferably 100 μm or more and 1000 μm (1 mm) or less. If the hole diameter D1 of the through holes 310 exceeds 2000 μm, the sound absorption and fire resistance of the laminated panel 1 may be deteriorated. The hole diameters D1 of the multiple through holes 310 may be uniform (see FIG. 2) or may vary.

[0055] The porosity of the first metal layer 31 is 0.5% or more and 50% or less, preferably 1.0% or more and 30% or less, more preferably 1.0% or more and 15% or less, and even more preferably 1.0% or more and 10% or less. If the porosity of the first metal layer 31 is less than 0.5%, the sound absorption properties of the laminated panel 1 may be reduced. On the other hand, if the porosity of the first metal layer 31 is more than 50%, the fire resistance of the laminated panel 1 may be reduced. The porosity of the first metal layer 31 refers to the ratio (percentage) of the area of ​​all the through holes 310 to the area of ​​the first metal layer 31 in a plan view.

[0056] The thickness T31 of the first metal layer 31 is preferably 7 μm or more and 200 μm or less, more preferably 10 μm or more and 100 μm or less. When the thickness T31 of the first metal layer 31 is 7 μm or more, the non-combustibility of the laminated panel 1 can be ensured. On the other hand, when the thickness T31 of the first metal layer 31 is 200 μm or less, the laminated panel 1 can be made lightweight.

[0057] <Thickness of laminated panel> The thickness of the laminated panel 1 is preferably 3 mm or more and 40 mm or less, more preferably 4 mm or more and 20 mm or less, and even more preferably 5 mm or more and 15 mm or less. Here, the thickness of the laminated panel 1 means the thickness of the entire laminated panel 1. In this embodiment, the thickness of the laminated panel 1 is the sum of the thickness T31 of the first metal layer 31 and the thickness T2 of the porous layer 2.

[0058] When the thickness of the laminated panel 1 is 3 mm or more, it becomes easier to achieve both sound absorption and non-combustibility of the laminated panel 1. On the other hand, when the thickness of the laminated panel 1 is 40 mm or less, it becomes easier to impart lightweight properties to the laminated panel 1.

[0059] <Action and effect> The laminated panel 1 according to this embodiment can achieve both sound absorption and non-combustibility.

[0060] The sound absorbing properties can be imparted to the laminated panel 1 mainly by the porous layer 2 having a predetermined air permeability and the first metal layer 31 having through holes 310 with a predetermined porosity and a predetermined hole diameter D1.

[0061] Here, the frequency of sound perceived by the human ear (audible range) is approximately 20 Hz to 20,000 Hz (20 kHz) inclusive, although this varies from person to person. The audible range is classified into a low-frequency range (approximately 20 Hz to less than 150 Hz), a mid-frequency range (150 Hz to less than 4,000 Hz), and a high-frequency range (4,000 Hz or higher). Note that the frequency bands for each range are only guidelines. The non-flammable sound-absorbing foam in Patent Document 1 has low sound absorption in the low-frequency range. However, the laminated panel 1 according to this embodiment can improve sound absorption across the entire audible range. In particular, the laminated panel 1 according to this embodiment has high sound absorption in the mid-frequency range. Note that sound absorption can be evaluated using a reverberation chamber sound absorption coefficient test (e.g., JIS A1409).

[0062] Furthermore, non-combustibility can be imparted to the laminated panel 1 mainly by the first metal layer 31 being disposed on the surface of the porous layer 2 .

[0063] The Building Standards Act stipulates that fire-resistant materials include flame-retardant materials, semi-incombustible materials, and incombustible materials. The first metal layer 31 may fall under the category of the above-mentioned fire-resistant materials.

[0064] Furthermore, as described above, the laminated panel 1 according to this embodiment can be thinned to a thickness of 40 mm or less, or 20 mm or less. In this way, the laminated panel 1 according to this embodiment has the advantage that it can be thinned while still achieving both sound absorption and non-combustibility.

[0065] (2) Second embodiment Next, a laminated panel 1 according to a second embodiment will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof may be omitted.

[0066] As shown in FIG. 3, the laminated panel 1 according to the second embodiment differs from the laminated panel 1 according to the first embodiment in that it further includes a second metal layer 32.

[0067] <Second metal layer> The second metal layer 32 is a layer containing a metal, similar to the first metal layer 31. Examples of the metal include the same metal as the metal contained in the first metal layer 31. The metal contained in the second metal layer 32 may be the same as or different from the metal contained in the first metal layer 31.

[0068] The second metal layer 32 is disposed on the second surface 22 of the porous layer 2. Specifically, the second metal layer 32 is directly or indirectly bonded to the second surface 22 of the porous layer 2. The method for bonding the second metal layer 32 to the second surface 22 of the porous layer 2 is the same as the method for bonding the first metal layer 31 to the first surface 21 of the porous layer 2.

[0069] In this embodiment, the second metal layer 32 does not have through holes. In this case, the through holes refer to holes that penetrate the second metal layer 32 in the thickness direction. In this way, the absence of through holes in the second metal layer 32 suppresses the passage of flames in the event of a fire. In other words, the second metal layer 32 can block the passage of flames from the positive direction of the Z axis to the negative direction, and from the negative direction of the Z axis to the positive direction. Therefore, the non-combustibility of the laminated panel 1 can be improved.

[0070] The thickness T32 of the second metal layer 32 is preferably 7 μm or more and 200 μm or less, more preferably 10 μm or more and 100 μm or less. When the thickness T32 of the second metal layer 32 is 7 μm or more, the non-combustibility of the laminated panel 1 can be ensured. On the other hand, when the thickness T32 of the second metal layer 32 is 200 μm or less, the laminated panel 1 can be made lightweight. Note that the thickness T32 of the second metal layer 32 may be the same as or different from the thickness T31 of the first metal layer 31 in the same laminated panel 1.

[0071] <Thickness of laminated panel> The thickness of the laminated panel 1 is preferably 3 mm or more and 40 mm or less, more preferably 4 mm or more and 20 mm or less, and even more preferably 5 mm or more and 15 mm or less. Here, the thickness of the laminated panel 1 means the thickness of the entire laminated panel 1. In this embodiment, the thickness of the laminated panel 1 is the sum of the thickness T31 of the first metal layer 31, the thickness T32 of the second metal layer 32, and the thickness T2 of the porous layer 2.

[0072] When the thickness of the laminated panel 1 is 3 mm or more, it becomes easier to achieve both sound absorption and non-combustibility of the laminated panel 1. On the other hand, when the thickness of the laminated panel 1 is 40 mm or less, it becomes easier to impart lightweight properties to the laminated panel 1.

[0073] <Action and effect> The laminated panel 1 according to this embodiment has the same effects as the laminated panel 1 according to the first embodiment. Furthermore, according to the laminated panel 1 according to this embodiment, the first metal layer 31 and the second metal layer 32 are disposed on both sides of the porous layer 2, thereby further improving non-combustibility. This is because the second metal layer 32 can also be considered a fire-resistant material as defined in the Building Standards Act.

[0074] (3) Third embodiment Next, a laminated panel 1 according to a third embodiment will be described with reference to the drawings. In the third embodiment, components similar to those in the first and second embodiments are denoted by the same reference numerals as in the first and second embodiments, and detailed descriptions thereof may be omitted.

[0075] As shown in FIG. 4, the laminated panel 1 according to the third embodiment differs from the laminated panel 1 according to the second embodiment in that it further includes a first glass fiber layer 41.

[0076] <First glass fiber layer> The first glass fiber layer 41 is a layer containing glass fibers. The first glass fiber layer 41 is not particularly limited, but examples thereof include glass paper (glass nonwoven fabric) and glass cloth. The weaving method of the glass cloth is not particularly limited, but examples thereof include plain weave. The first glass fiber layer 41 may further contain a resin. The resin is not particularly limited.

[0077] The first glass fiber layer 41 is disposed between the porous layer 2 and the first metal layer 31. That is, the first glass fiber layer 41 is bonded to the porous layer 2 and the first metal layer 31. When bonding the first glass fiber layer 41 to the porous layer 2 and the first metal layer 31, any of the above-mentioned adhesives, pressure-sensitive adhesives, and pressure-sensitive adhesive tapes may be used.

[0078] Preferably, the first glass fiber layer 41 has a plurality of through holes 410. The through holes 410 are holes that penetrate the first glass fiber layer 41 in the thickness direction. The through holes 410 can be formed by an appropriate method, for example, press processing such as punching, roll processing using a needle roll, or laser processing.

[0079] When the first glass fiber layer 41 is a glass cloth, the basket holes can serve as the through holes 410. Therefore, in this case, it is not necessary to form the through holes 410 separately in the first glass fiber layer 41. The basket holes refer to portions that are surrounded by glass yarns and do not contain glass yarns when the glass cloth is viewed in the thickness direction.

[0080] The arrangement of the multiple through holes 410 in the XY plane is the same as the description of the arrangement of the multiple through holes 310 in the XY plane. Note that the arrangement of the multiple through holes 410 in the XY plane and the arrangement of the multiple through holes 310 in the XY plane may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0081] In the thickness direction of the laminated panel 1, the positions of the through holes 410 in the first glass fiber layer 41 and the positions of the through holes 310 in the first metal layer 31 may or may not coincide with each other. In this embodiment, they coincide with each other, so that the through holes 410 and the through holes 310 communicate with each other.

[0082] The shape of the through hole 410 in a plan view is the same as that described above for the shape of the through hole 310 in a plan view. Note that the shape of the through hole 410 in a plan view and the shape of the through hole 310 in a plan view may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0083] The hole diameter of the through hole 410 is the same as that described for the hole diameter D1 of the through hole 310. Note that the hole diameter of the through hole 410 and the hole diameter D1 of the through hole 310 may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0084] The porosity of the first glass fiber layer 41 is the same as that of the first metal layer 31. The porosity of the first glass fiber layer 41 and the porosity of the first metal layer 31 may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0085] <Thickness of laminated panel> The thickness of the laminated panel 1 according to this embodiment is preferably 3 mm to 40 mm, more preferably 4 mm to 20 mm, and even more preferably 5 mm to 15 mm, as in the first and second embodiments. In this embodiment, the thickness of the laminated panel 1 is the sum of the thickness T31 of the first metal layer 31, the thickness T32 of the second metal layer 32, the thickness T2 of the porous layer 2, and the thickness T41 of the first glass fiber layer 41.

[0086] <Action and effect> The laminated panel 1 according to this embodiment has the same effects as the laminated panels 1 according to the first and second embodiments. In particular, according to the laminated panel 1 according to this embodiment, the inclusion of the first glass fiber layer 41 can further improve non-combustibility. The first glass fiber layer 41 can also improve the dimensional stability of the laminated panel 1. Furthermore, the first glass fiber layer 41 has through holes 410, which can further improve sound absorption.

[0087] (4) Fourth embodiment Next, a laminated panel 1 according to a fourth embodiment will be described with reference to the drawings. In the fourth embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals as those in the first to third embodiments, and detailed description thereof may be omitted.

[0088] As shown in FIG. 5, the laminated panel 1 according to the fourth embodiment differs from the laminated panel 1 according to the third embodiment in that it further includes a second glass fiber layer 42.

[0089] <Second glass fiber layer> The second glass fiber layer 42 is a layer containing glass fibers, similar to the first glass fiber layer 41. As the second glass fiber layer 42, the same materials as those of the first glass fiber layer 41 can be used.

[0090] The second glass fiber layer 42 is disposed between the porous layer 2 and the second metal layer 32. That is, the second glass fiber layer 42 is bonded to the porous layer 2 and the second metal layer 32. When bonding the second glass fiber layer 42 to the porous layer 2 and the second metal layer 32, any of the adhesives, pressure-sensitive adhesives, and pressure-sensitive adhesive tapes described above may be used.

[0091] In this embodiment, the second glass fiber layer 42 does not have through holes. In this case, the through holes refer to holes that penetrate the second glass fiber layer 42 in the thickness direction. In this way, the absence of through holes in the second glass fiber layer 42 suppresses flame penetration in the event of a fire. In other words, the second glass fiber layer 42 can block flame penetration from the positive direction of the Z axis to the negative direction, and from the negative direction of the Z axis to the positive direction. Therefore, the non-combustibility of the laminated panel 1 can be improved.

[0092] <Thickness of laminated panel> The thickness of the laminated panel 1 according to this embodiment is preferably 3 mm to 40 mm, more preferably 4 mm to 20 mm, and even more preferably 5 mm to 15 mm, as in the first to third embodiments. In this embodiment, the thickness of the laminated panel 1 is the sum of the thickness T31 of the first metal layer 31, the thickness T32 of the second metal layer 32, the thickness T2 of the porous layer 2, the thickness T41 of the first glass fiber layer 41, and the thickness T42 of the second glass fiber layer 42.

[0093] <Action and effect> The laminated panel 1 according to this embodiment has the same effects as the laminated panels 1 according to the first to third embodiments. In particular, according to the laminated panel 1 according to this embodiment, the incombustibility can be further improved by providing the second glass fiber layer 42. The dimensional stability of the laminated panel 1 can also be improved by the second glass fiber layer 42. Furthermore, the second glass fiber layer 42 does not have through holes, so the incombustibility can be further improved.

[0094] (5) Fifth embodiment Next, a laminated panel 1 according to a fifth embodiment will be described with reference to the drawings. In the fifth embodiment, the same components as those in the first to fourth embodiments are denoted by the same reference numerals as those in the first to fourth embodiments, and detailed description thereof may be omitted.

[0095] 6A, the laminated panel 1 according to the fifth embodiment differs from the laminated panel 1 according to the fourth embodiment in that it further includes a third glass fiber layer 43. Note that the third glass fiber layer 43 may be replaced with a decorative sheet (not shown).

[0096] <Third glass fiber layer> The third glass fiber layer 43 is a layer containing glass fibers, similar to the first glass fiber layer 41. As the third glass fiber layer 43, the same materials as those of the first glass fiber layer 41 can be used.

[0097] The third glass fiber layer 43 is disposed on the surface of the first metal layer 31 opposite to the porous layer 2. In other words, the third glass fiber layer 43 is disposed on the surface of the first metal layer 31 opposite to the first glass fiber layer 41. In this manner, the first metal layer 31 is interposed between the third glass fiber layer 43 and the first glass fiber layer 41. The third glass fiber layer 43 is bonded to the first metal layer 31. When bonding the third glass fiber layer 43 to the first metal layer 31, any of the above-mentioned adhesives, pressure-sensitive adhesives, and pressure-sensitive adhesive tapes may be used.

[0098] Preferably, the third glass fiber layer 43 has a plurality of through holes 430, similar to the first glass fiber layer 41. The through holes 430 are holes that penetrate the third glass fiber layer 43 in the thickness direction. The through holes 430 can be formed by an appropriate method, for example, press processing such as punching, roll processing using a needle roll, or laser processing.

[0099] When the third glass fiber layer 43 is a glass cloth, the basket holes can serve as the through-holes 430. Therefore, in this case, it is not necessary to form the through-holes 430 separately in the third glass fiber layer 43.

[0100] The arrangement of the multiple through holes 430 in the XY plane is the same as the description of the arrangement of the multiple through holes 310 in the XY plane. Note that the arrangement of the multiple through holes 430 in the XY plane and the arrangement of the multiple through holes 310 in the XY plane may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0101] In the thickness direction of the laminated panel 1, the positions of the through holes 430 in the third glass fiber layer 43 and the positions of the through holes 310 in the first metal layer 31 may or may not coincide with each other. In this embodiment, they coincide with each other, so that the through holes 430, 310, and 410 communicate with each other.

[0102] The shape of the through hole 430 in a plan view is the same as that described for the shape of the through hole 310 in a plan view. Note that the shape of the through hole 430 in a plan view and the shape of the through hole 310 in a plan view may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0103] The hole diameter of the through hole 430 is the same as that described for the hole diameter D1 of the through hole 310. Note that the hole diameter of the through hole 430 and the hole diameter D1 of the through hole 310 may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0104] The porosity of the third glass fiber layer 43 is the same as that of the first metal layer 31. The porosity of the third glass fiber layer 43 and the porosity of the first metal layer 31 may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0105] <Decorative sheet> The decorative sheet is a sheet for decorating the laminated panel 1. The decorative sheet is not particularly limited. The decorative sheet is adhered to the first metal layer 31 instead of the third glass fiber layer 43. The adhesion means is not particularly limited. The decorative sheet may have through holes similar to those of the first metal layer 31. Providing the laminated panel 1 with a decorative sheet can enhance the design of the laminated panel 1.

[0106] <Thickness of laminated panel> The thickness of the laminated panel 1 according to this embodiment is preferably 3 mm to 40 mm, more preferably 4 mm to 20 mm, and even more preferably 5 mm to 15 mm, as in the first to fourth embodiments. In this embodiment, the thickness of the laminated panel 1 is the sum of the thickness T31 of the first metal layer 31, the thickness T32 of the second metal layer 32, the thickness T2 of the porous layer 2, the thickness T41 of the first glass fiber layer 41, the thickness T42 of the second glass fiber layer 42, and the thickness T43 of the third glass fiber layer 43.

[0107] <Action and effect> The laminated panel 1 according to this embodiment has the same effects as the laminated panels 1 according to the first to fourth embodiments. In particular, according to the laminated panel 1 according to this embodiment, the third glass fiber layer 43 is provided, thereby further improving non-combustibility. The third glass fiber layer 43 also improves the dimensional stability of the laminated panel 1. Furthermore, the third glass fiber layer 43 has through holes 430, thereby further improving sound absorption properties.

[0108] <Modification> FIG. 6B shows a laminated panel 1 according to a modified example of this embodiment. In this modified example, the porous layer 2 has non-through holes 23. The non-through holes 23 are open on the first surface 21. The non-through holes 23 are conical in shape, but may be of a shape other than a cone. Shapes other than a cone are not particularly limited, and examples thereof include pyramids, cylinders, and rectangular columns. The non-through holes 23 are in communication with the through holes 410, the through holes 310, and the through holes 430. The non-through holes 23 can be formed by an appropriate method, such as roll processing or laser processing.

[0109] In this modification, the porous layer 2 has the non-through holes 23, which allows more open cells to open on the inner surfaces of the non-through holes 23. Therefore, compared to a porous layer 2 that does not have the non-through holes 23, sound is more likely to enter and diffuse into the porous layer 2. This can further improve the sound absorption properties.

[0110] (6) Sixth embodiment Next, a laminated panel 1 according to a sixth embodiment will be described with reference to the drawings. In the sixth embodiment, the same components as those in the first to fifth embodiments are denoted by the same reference numerals as those in the first to fifth embodiments, and detailed description thereof may be omitted.

[0111] As shown in FIG. 7A, the laminated panel 1 according to the sixth embodiment differs from the laminated panel 1 according to the sixth embodiment in that the second metal layer 32 has a through hole 320 and the second glass fiber layer 42 has a through hole 420.

[0112] <Second metal layer> The second metal layer 32 has a plurality of through holes 320. The through holes 320 are holes that penetrate the second metal layer 32 in the thickness direction.

[0113] The arrangement of the multiple through holes 320 in the XY plane is the same as the description of the arrangement of the multiple through holes 310 in the XY plane. Note that the arrangement of the multiple through holes 320 in the XY plane and the arrangement of the multiple through holes 310 in the XY plane may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0114] In the thickness direction of the laminated panel 1, the positions of the through holes 320 in the second metal layer 32 and the positions of the through holes 310 in the first metal layer 31 may or may not coincide with each other (in this embodiment, they coincide with each other).

[0115] The shape of the through hole 320 in a plan view is the same as that described for the shape of the through hole 310 in a plan view. Note that the shape of the through hole 320 in a plan view and the shape of the through hole 310 in a plan view may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0116] The hole diameter of the through hole 320 is the same as that described for the hole diameter D1 of the through hole 310. Note that the hole diameter of the through hole 320 and the hole diameter D1 of the through hole 310 may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0117] The aperture ratio of the second metal layer 32 is the same as that of the first metal layer 31. The aperture ratio of the second metal layer 32 and the aperture ratio of the first metal layer 31 may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0118] <Second glass fiber layer> The second glass fiber layer 42 has a plurality of through holes 420. The through holes 420 are holes that penetrate the second glass fiber layer 42 in the thickness direction.

[0119] The arrangement of the multiple through holes 420 in the XY plane is the same as the description of the arrangement of the multiple through holes 310 in the XY plane. Note that the arrangement of the multiple through holes 420 in the XY plane and the arrangement of the multiple through holes 310 in the XY plane may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0120] In the thickness direction of the laminated panel 1, the positions of the through holes 420 in the second glass fiber layer 42 and the positions of the through holes 310 in the first metal layer 31 may or may not coincide with each other. In this embodiment, they coincide with each other, so that the through holes 420 and the through holes 320 communicate with each other.

[0121] The shape of the through hole 420 in plan view is the same as that described for the shape of the through hole 310 in plan view. Note that the shape of the through hole 420 in plan view and the shape of the through hole 310 in plan view may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0122] The hole diameter of the through hole 420 is the same as that described for the hole diameter D1 of the through hole 310. Note that the hole diameter of the through hole 420 and the hole diameter D1 of the through hole 310 may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0123] The aperture rate of the second glass fiber layer 42 is the same as that of the first metal layer 31. The aperture rate of the second glass fiber layer 42 and the aperture rate of the first metal layer 31 may be the same or different in the same laminated panel 1 (they are the same in this embodiment).

[0124] <Thickness of laminated panel> The thickness of the laminated panel 1 according to this embodiment is preferably 3 mm to 40 mm, more preferably 4 mm to 20 mm, and even more preferably 5 mm to 15 mm, as in the first to fifth embodiments. In this embodiment, the thickness of the laminated panel 1 is the sum of the thickness T31 of the first metal layer 31, the thickness T32 of the second metal layer 32, the thickness T2 of the porous layer 2, the thickness T41 of the first glass fiber layer 41, the thickness T42 of the second glass fiber layer 42, and the thickness T43 of the third glass fiber layer 43.

[0125] <Action and effect> The laminated panel 1 according to this embodiment has the same effects as the laminated panels 1 according to the first to fifth embodiments. Furthermore, according to the laminated panel 1 according to this embodiment, the second metal layer 32 has the through-holes 320, and the second glass fiber layer 42 has the through-holes 420, thereby further improving the sound absorption properties.

[0126] <Modification> FIG. 7B shows a laminated panel 1 according to a modified example of this embodiment. In this modified example, the porous layer 2 has a through hole 24. The through hole 24 is a hole that penetrates the porous layer 2 in the thickness direction. The through hole 24 has a circular shape in plan view, but may have a shape other than a circle. Shapes other than a circle include, but are not limited to, an ellipse, a rounded rectangle, and a polygon. The through hole 24 is in communication with the through hole 410, the through hole 310, the through hole 430, the through hole 420, and the through hole 320. The through hole 24 can be formed by an appropriate method, such as press processing such as punching, roll processing using a needle roll, or laser processing.

[0127] In this modification, the porous layer 2 has through holes 24, which makes it easier for sound generated on one side of the laminated panel 1 (the side facing the negative direction of the Z axis) to pass through the through holes 24 and escape to the other side of the laminated panel 1 (the side facing the positive direction of the Z axis). Also, more open cells can open on the inner surfaces of the through holes 24. Therefore, compared to a case in which the porous layer 2 does not have through holes 24, sound is more likely to enter and diffuse within the porous layer 2. This can further improve sound absorption.

[0128] 3. Aspects As is clear from the above-described embodiments and modifications, the present disclosure includes the following aspects. In the following, reference numerals are given in parentheses only to clarify the correspondence with the embodiments.

[0129] The first aspect is a laminated panel (1) comprising a porous layer (2) and a first metal layer (31). The porous layer (2) has a first surface (21) and a second surface (22) opposite the first surface (21), and has an air permeability of 0.28 cm 3 / cm 2 / sec or more 50cm 3 / cm 2 The first metal layer (31) is disposed on the first surface (21) of the porous layer (2), and has through-holes (310) with an area ratio of 0.5% or more and 50% or less and a pore diameter (D1) of 2000 μm or less.

[0130] According to this aspect, it is possible to achieve both sound absorption and non-combustibility.

[0131] The second aspect is a laminated panel (1) based on the first aspect, further comprising a first glass fiber layer (41) disposed between the porous layer (2) and the first metal layer (31).

[0132] According to this embodiment, it is possible to further improve non-combustibility and dimensional stability.

[0133] A third aspect is a laminated panel (1) based on the first or second aspect. In the third aspect, the thickness of the first metal layer (31) is 7 μm or more and 200 μm or less.

[0134] According to this embodiment, the laminated panel (1) can be made lightweight while ensuring non-combustibility.

[0135] A fourth aspect is a laminated panel (1) based on any one of the first to third aspects. In the fourth aspect, the laminated panel (1) further comprises a second metal layer (32). The second metal layer (32) is disposed on the second surface (22) of the porous layer (2).

[0136] According to this embodiment, non-combustibility can be improved.

[0137] A fifth aspect is a laminated panel (1) based on the fourth aspect, further comprising a second glass fiber layer (42) disposed between the porous layer (2) and the second metal layer (32).

[0138] According to this embodiment, it is possible to further improve non-combustibility and dimensional stability.

[0139] A sixth aspect is the laminated panel (1) based on the fourth or fifth aspect. In the sixth aspect, the thickness of the second metal layer (32) is 7 μm or more and 200 μm or less.

[0140] According to this embodiment, the laminated panel (1) can be made lightweight while ensuring non-combustibility.

[0141] The seventh aspect is a laminated panel (1) based on any one of the fourth to sixth aspects. In the seventh aspect, the second metal layer (32) does not have through-holes.

[0142] According to this embodiment, the second metal layer (32) prevents flames from passing through, thereby improving non-combustibility.

[0143] An eighth aspect is a laminated panel (1) based on any one of the fourth to sixth aspects. In the eighth aspect, the second metal layer (32) has through-holes (320).

[0144] According to this embodiment, not only the first metal layer (31) has the through-holes (310), but also the second metal layer (32) has the through-holes (320), thereby improving sound absorption properties.

[0145] A ninth aspect is the laminated panel (1) based on any one of the first to eighth aspects. The ninth aspect further includes a third glass fiber layer (43) or a decorative sheet arranged on the surface of the first metal layer (31) opposite to the porous layer (2).

[0146] According to this embodiment, it is possible to further improve non-combustibility and dimensional stability.

[0147] A tenth aspect is the laminated panel (1) based on the ninth aspect. In the tenth aspect, the third glass fiber layer (43) or the decorative sheet has through holes (430).

[0148] According to this aspect, the sound absorption properties can be further improved.

[0149] An eleventh aspect is the laminated panel (1) based on any one of the first to tenth aspects. In the eleventh aspect, the thickness of the laminated panel (1) is 3 mm or more and 40 mm or less.

[0150] According to this embodiment, the laminated panel (1) can be made lightweight while achieving both sound absorption and non-combustibility. [Example]

[0151] The present disclosure will be specifically described below using examples, but the present disclosure is not limited to the following examples.

[0152] Example 1 The porous layer was made of polyurethane foam (Kurabo Industries, Ltd., air permeability 1.5 cm 3 / cm 2 / sec, rigid urethane foam) was prepared. As the first metal layer, an aluminum sheet with a thickness of 20 μm, an opening rate of 3%, and through holes with a pore diameter of 300 μm was prepared.

[0153] Then, a first metal layer was attached to the first surface of the porous layer to produce a laminated panel.

[0154] Example 2 As the second metal layer, an aluminum sheet having no through holes and a thickness of 20 μm was prepared.

[0155] Then, a laminated panel was produced in the same manner as in Example 1, except that a second metal layer was attached to the second surface of the porous layer.

[0156] Example 3 The porous layer has a permeability of 1 cm 3 / cm 2 A laminated panel was produced in the same manner as in Example 2, except that the tensile strength was 1 / sec.

[0157] Example 4 The porous layer has a permeability of 10cm 3 / cm 2 A laminated panel was produced in the same manner as in Example 2, except that the tensile strength was 1 / sec.

[0158] Example 5 The porous layer has a permeability of 50 cm 3 / cm 2 A laminated panel was produced in the same manner as in Example 2, except that the tensile strength was 1 / sec.

[0159] Example 6 A laminated panel was produced in the same manner as in Example 2, except that the opening rate of the first metal layer was 0.5%.

[0160] Example 7 A laminated panel was produced in the same manner as in Example 2, except that the opening rate of the first metal layer was 50%.

[0161] Example 8 A laminated panel was produced in the same manner as in Example 2, except that the pore size of the first metal layer was 50 μm.

[0162] Example 9 A laminated panel was produced in the same manner as in Example 2, except that the pore size of the first metal layer was 2000 μm.

[0163] Example 10 A laminated panel was produced in the same manner as in Example 2, except that the thickness of the first metal layer and the thickness of the second metal layer were 40 μm.

[0164] Example 11 A laminated panel was produced in the same manner as in Example 2, except that a first glass fiber layer (glass cloth (GC)) was interposed between the porous layer and the first metal layer. The first glass fiber layer had through holes similar to those of the first metal layer.

[0165] Example 12 A laminated panel was produced in the same manner as in Example 11, except that a second glass fiber layer (glass cloth (GC)) was interposed between the porous layer and the second metal layer. The second glass fiber layer did not have through holes.

[0166] Example 13 A laminated panel was produced in the same manner as in Example 12, except that a third glass fiber layer (glass paper (GP)) was attached to the surface of the first metal layer opposite the porous layer. The third glass fiber layer had through holes similar to those of the first metal layer.

[0167] Example 14 A laminated panel was produced in the same manner as in Example 12, except that a decorative sheet was attached to the surface of the first metal layer opposite the porous layer. The decorative sheet was made of an olefin-based material and had through holes similar to those of the first metal layer.

[0168] Example 15 A laminated panel was produced in the same manner as in Example 12, except that the second metal layer had through-holes with an opening rate of 3% and a hole diameter of 300 μm.

[0169] Example 16 The porous layer has a permeability of 20 cm 3 / cm 2 A laminated panel was produced in the same manner as in Example 12, except that the second metal layer had through-holes with an opening rate of 10% and a hole diameter of 300 μm.

[0170] Example 17 The porous layer has a permeability of 50 cm 3 / cm 2 A laminated panel was produced in the same manner as in Example 16, except that the tensile strength was 1 / sec.

[0171] (Comparative Example 1) A laminated panel was produced in the same manner as in Example 2, except that the opening rate of the first metal layer was 60%.

[0172] (Comparative Example 2) A laminated panel was produced in the same manner as in Example 2, except that the porosity of the first metal layer was 0.05%.

[0173] (Comparative Example 3) A laminated panel was produced in the same manner as in Example 2, except that the first metal layer did not have through holes.

[0174] Comparative Example 4 Instead of the porous layer of Example 2, a polyurethane foam containing closed cells (manufactured by Achilles Corporation, air permeability 0.28 cm 3 / cm 2 A laminated panel was produced in the same manner as in Example 2, except that a tensile strength of 1000 kJ / sec or less was used.

[0175] (Comparative Example 5) Instead of the porous layer of Example 2, a polyurethane foam (manufactured by Sanitec Co., Ltd., trade name "Aqua Pad", air permeability 400 cm 3 / cm 2 A laminated panel was produced in the same manner as in Example 2, except that a tensile strength of 1000 kJ / sec or more was used.

[0176] (Comparative Example 6) A laminated panel was produced in the same manner as in Example 2, except that the first metal layer was not used.

[0177] (Evaluation method) <Sound absorption: sound pressure measurement> The sound pressure level of the measurement sample 10 (laminated panel 1) was measured using a sound pressure measuring device 9 shown in FIG. 8, and the sound absorption properties (sound insulation performance) were evaluated.

[0178] The sound pressure measuring device 9 includes a measurement box 90 , a speaker 95 , a first microphone 91 , and a second microphone 92 .

[0179] The measurement box 90 is divided into two spaces by the measurement sample 10. The two spaces are a front chamber (sound source chamber) 93 and a rear chamber (sound receiving chamber) 94. The measurement sample 10 is placed so that the first surface 21 of the porous layer 2 faces the front chamber 93 and the second surface 22 faces the rear chamber 94. The size of the measurement sample 10 is 300 mm × 300 mm.

[0180] The front chamber 93 has an inner surface 930 facing the measurement sample 10. The distance L93 between the measurement sample 10 and the inner surface 930 is 150 mm.

[0181] The rear chamber 94 has an inner surface 940 facing the measurement sample 10. The distance L94 between the measurement sample 10 and the inner surface 940 is 300 mm.

[0182] The speaker 95 is disposed in the front chamber 93. The speaker 95 faces the measurement sample 10. The distance between the speaker 95 and the measurement sample 10 is equal to L93.

[0183] The first microphone 91 is disposed in the front room 93. The first microphone 91 is capable of measuring the sound pressure level in the front room 93.

[0184] The second microphone 92 is disposed in the rear chamber 94. The second microphone 92 is capable of measuring the sound pressure level in the rear chamber 94.

[0185] Using the sound pressure measuring device 9 described above, test sounds (low to high frequencies) were generated from the speaker 95, and the sound pressure level in the front room 93 was measured with the first microphone 91, and the sound pressure level in the rear room 94 was measured with the second microphone 92. The difference between the indoor average values ​​of the sound pressure levels in the front room 93 and the rear room 94 (inter-room sound pressure level difference) was then determined. The inter-room sound pressure level difference was classified according to the following evaluation criteria, and the sound absorption (sound insulation performance) was evaluated. The results are shown in Tables 1 to 3.

[0186] <Evaluation Criteria> A: The difference in sound pressure level between the rooms of the measurement sample is greater than the difference in sound pressure level between the rooms of plywood (a sample with no sound absorption properties). B: The difference in sound pressure level between the rooms of the measurement sample is less than the difference in sound pressure level between the rooms of plywood (a sample with no sound absorption properties).

[0187] <Sound absorption: NRC> A reverberation chamber sound absorption coefficient test was conducted. Specifically, a laminated panel was placed in a reverberation chamber, and an air layer (300 mm thick) was placed behind the laminated panel (the surface on the second metal layer side), and the sound absorption coefficients were measured at 250 Hz, 500 Hz, 1 kHz, and 2 kHz. The noise reduction coefficient (NRC) was calculated as the arithmetic mean value of these sound absorption coefficients. The NRC values ​​were classified according to the following evaluation criteria to evaluate the sound absorption properties. The results are shown in Tables 1 to 3.

[0188] <Evaluation Criteria> A: NRC value is 0.3 or more B: NRC value is less than 0.3.

[0189] <Nonflammable> A heat generation test was conducted in accordance with Appendix A of JIS A5422 (ceramic siding). The test results were classified according to the following evaluation criteria, and non-combustibility was evaluated. The results are shown in Tables 1 to 3.

[0190] <Evaluation Criteria> A: Meet all of the following (1) to (3) B: Does not meet at least one of the following conditions (1) to (3): (1) The total heat generated by the end of the heating time is 8.0 MJ / m 2 is (2) There are no cracks or holes that penetrate to the back surface during the heating period that are harmful to fire safety. (3) The maximum heat generation rate during heating is 200 kW / m for 10 seconds or more. 2 does not exceed.

[0191] [Table 1]

[0192] [Table 2]

[0193] [Table 3] [Explanation of symbols]

[0194] 1. Laminated Panel 2 Porous layer 21 Page 1 22 Side 2 31 1st metal layer 310 Through hole 32 Second metal layer 320 Through hole 41 First glass fiber layer 42 Second glass fiber layer 43 Third glass fiber layer 430 Through hole

Claims

1. a first surface and a second surface opposite the first surface, and an air permeability of 0.28 cm ３ / cm ２ / sec or more 50cm ３ / cm ２ / sec or less porous layer; a first metal layer disposed on the first surface of the porous layer, the first metal layer having through holes with an area ratio of 1.0% or more and 50% or less and a pore diameter of 100 μm or more and 2000 μm or less; Laminated panel.

2. a first glass fiber layer disposed between the porous layer and the first metal layer; The laminated panel according to claim 1 .

3. The thickness of the first metal layer is 7 μm or more and 200 μm or less. The laminated panel according to claim 1 or 2.

4. further comprising a second metal layer disposed on the second surface of the porous layer. The laminated panel according to any one of claims 1 to 3.

5. a second glass fiber layer disposed between the porous layer and the second metal layer; The laminated panel according to claim 4.

6. The thickness of the second metal layer is 7 μm or more and 200 μm or less. The laminated panel according to claim 4 or 5.

7. the second metal layer does not have a through hole; The laminated panel according to any one of claims 4 to 6.

8. the second metal layer has a through hole; The laminated panel according to any one of claims 4 to 6.

9. Further provided is a third glass fiber layer or a decorative sheet arranged on the surface of the first metal layer opposite to the porous layer. The laminated panel according to any one of claims 1 to 8.

10. the third glass fiber layer or the decorative sheet has through holes; The laminated panel according to claim 9.

11. The thickness of the laminated panel is 3 mm or more and 40 mm or less, The laminated panel according to any one of claims 1 to 10.

Images