Decorative sheet and sound absorbing material

Abstract

To provide a decorative sheet and a sound absorbing material that can prevent sound absorbency from degrading.SOLUTION: A sound absorbing material 100 includes: a substrate layer formed using a polyester resin; and a glass cloth layer laminated on one of surfaces of the substrate layer and formed using a glass cloth. A laminate of the substrate layer and the glass cloth layer includes a decorative sheet 10 in which an opening 7 extending through in a direction in which the substrate layer and the glass cloth layer are laminated is formed, and a decorative laminate 30 arranged at a space from the decorative sheet 10 in a state in which one of surfaces is opposed to the glass cloth layer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a decorative sheet and a sound-absorbing material. [Background technology]

[0002] In recent years, it has become common to attend business meetings from home or a telework booth using a videoconferencing system, without having to go to the office. Since a telework booth is a closed space, the voice you speak may echo and cause reverberation. For this reason, in order to reduce reverberation, the telework booth may be configured with sound-absorbing materials. As for sound-absorbing materials, polyester felt sound-absorbing material is commonly used, but in closed spaces such as telework booths, it is preferable to use non-flammable materials in case of a fire.

[0003] Sound-absorbing materials made from non-flammable materials include those made of solidified glass wool, but these have problems such as poor design and the possibility of causing skin irritation when touched. To address this problem, for example, Patent Document 1 discloses a sound-absorbing material that is made by irradiating a PVC film with an adhesive on the back with a laser to make holes, and then laminating the PVC film with glass cloth. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6110056 Summary of the Invention [Problem to be solved by the invention]

[0005] In sound-absorbing materials made by punching holes in adhesive-coated PVC film, there is a possibility that the adhesive will block the holes when laminating the glass cloth onto the PVC film, resulting in a problem of reduced sound absorption in low wavelength regions, such as the frequency region below 1000 Hz.

[0006] In view of the above-mentioned problems, the present invention has an object to provide a decorative sheet and a sound-absorbing material that are capable of suppressing a decrease in sound absorption properties. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, one aspect of the present invention is a decorative sheet including a base layer formed using a polyester resin, and a glass cloth layer laminated on one surface of the base layer and formed using glass cloth, and an opening is formed in the laminate of the base layer and the glass cloth layer, penetrating the base layer and the glass cloth layer in the direction in which the base layer and the glass cloth layer are laminated.

[0008] In addition, in order to solve the above-mentioned problems, one aspect of the present invention is a sound-absorbing material comprising a decorative sheet and a decorative panel arranged at a distance from the decorative sheet with one side facing a glass cloth layer. Effect of the Invention

[0009] According to one aspect of the present invention, it is possible to provide a decorative sheet and a sound-absorbing material that are capable of suppressing a decrease in sound absorption properties. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a cross-sectional view showing the configuration of a sound-absorbing material in the first embodiment. [Diagram 2] FIG. 1 is a cross-sectional view showing a configuration of a decorative sheet in a first embodiment. [Diagram 3] FIG. 4 is a cross-sectional view showing the configuration of a sound-absorbing material in a modified example of the first embodiment. [Figure 4] 1 is a graph showing the results of reverberation room sound absorption coefficient measurements (reverberation room sound absorption coefficient measurements). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present technology will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted with the same or similar reference numerals, and duplicated descriptions are omitted. Each drawing is schematic and may differ from the actual one. The embodiments shown below are examples of devices and methods for embodying the technical idea of ​​the present technology, and the technical idea of ​​the present technology is not limited to the devices and methods exemplified in the following embodiments. The technical idea of ​​the present technology can be modified in various ways within the technical scope described in the claims. In addition, the directions of "left and right" and "up and down" in the following description are merely definitions for the convenience of explanation and do not limit the technical idea of ​​the present invention. Therefore, for example, if the paper is rotated 90 degrees, "left and right" and "up and down" are read interchangeably, and of course, if the paper is rotated 180 degrees, "left" becomes "right" and "right" becomes "left".

[0012] First embodiment Hereinafter, the configuration of a sound-absorbing material 100 in the first embodiment will be described with reference to FIG. As shown in FIG. 1, the sound-absorbing material 100 includes a decorative sheet 10, a spacer 20, and a decorative plate 30. Moreover, the sound absorbing material 100 has a peak sound absorption coefficient measured by a reverberation room method in accordance with ISO354 (JIS A 1409) of 1600 [Hz] or less.

[0013] The decorative sheet 10 is formed in a sheet shape and has a plurality of openings 7 formed therein. The spacer 20 is made of, for example, aluminum, and is disposed between the decorative sheet 10 and the decorative plate 30 .

[0014] The spacer 20 also has a plurality of gaps 40 . The void portion 40 is connected to the opening 7. The void portion 40 and the opening 7, which are connected to each other, form a continuous space from the surface of the decorative sheet 10 opposite the surface facing the spacer 20 (the upper surface in FIG. 1) to one surface 30a of the decorative board 30 (the upper surface in FIG. 1).

[0015] The decorative board 30 is disposed at a distance from the decorative sheet 10 with one surface 30a facing a glass cloth layer (a layer provided in the decorative sheet 10) described below. Therefore, one surface 30a of the decorative board 30 forms a reflecting surface that reflects the sound (sound waves) that has passed through the opening 7 and entered the gap 40. The distance R between the decorative sheet 10 and the decorative board 30 is within a range of 10 mm to 50 mm. In the first embodiment, as an example, a case where the distance R between the decorative sheet 10 and the decorative board 30 is within a range of 30 mm to 50 mm will be described.

[0016] The decorative board 30 (structural body) is a part of the adherend to which the decorative sheet 10 is attached, such as the walls, ceilings, floors, partitions, etc. of ordinary houses, apartment buildings, buildings, and other structures. The decorative board 30 may be a substrate formed using, for example, plate-shaped metal, plaster, etc., and the sound-absorbing material 100 having the decorative sheet 10 attached to a substrate may be attached to a wall surface, ceiling surface, floor surface, partition, etc. The sound-absorbing material 100 may also be used to form walls, ceilings, floors, partitions, etc. The decorative board 30 is formed, for example, by laminating an olefin sheet onto a calcium silicate board having a thickness of 3 mm.

[0017] <Decorative sheet> As shown in FIG. 2, the decorative sheet 10 includes a substrate layer 1, a printed layer 2, a surface protective layer 3, a primer layer 4, an adhesive layer 5, and a glass cloth layer 6.

[0018] The thickness of the decorative sheet 10 is, for example, within a range of 0.215 mm to 0.423 mm, and more preferably within a range of 0.215 mm to 0.374 mm. The mass of the decorative sheet 10 is, for example, 245 [g / m 2 ] or more than 436.88[g / m 2 ] or less, and more preferably, 245 [g / m 2 ] or more than 414.81[g / m 2 ] Within the following range.

[0019] <Base material layer> The base layer 1 is formed using a polyester resin-based film containing a polyester resin, that is, the base layer 1 is a layer formed using a polyester-based resin. Furthermore, inorganic pigments (titanium oxide, iron oxide, etc.) may be added to the base layer 1 as required. The composition of the base layer 1 is, for example, a composition containing 67.0 mass [%] or more and 96.5 mass [%] or less of polyester resin and 3.5 mass [%] or more and 33.0 mass [%] or less of inorganic pigment.

[0020] The thickness of the base layer 1 is, for example, 0.093 mm or less (more preferably, 0.077 mm). This reduces the amount of combustion. The lower limit of the thickness of the base layer 1 is, for example, 0.045 mm or more, taking into account the strength of the base layer 1, etc. The mass of the base layer 1 is, for example, 124.0 [g / m 2 ] or less (organic mass 111.0 [g / m 2 ] or less), and preferably 110.0 [g / m 2 ] or less (organic mass 78.76[g / m 2 ] below).

[0021] <Print layer> The printed layer 2 is laminated on the other surface (the upper surface in Figure 2) of the base layer 1, and is a layer formed, for example, by printing with a urethane resin-based ink in order to improve the design of the decorative sheet 10. As the urethane resin-based ink, for example, ink containing a urethane resin, a vinyl chloride-vinyl acetate copolymer resin, an organic pigment, or an inorganic pigment can be used.

[0022] The composition of the printed layer 2 may, for example, contain urethane resin in the range of 50.9% by mass to 76.7% by mass, and vinyl chloride-vinyl acetate copolymer resin in the range of 10.2% by mass to 23.3% by mass. In addition, the composition of the printed layer 2 may, for example, contain organic pigment in the range of 0% by mass to 37.7% by mass, and inorganic pigment in the range of 0% by mass to 20.0% by mass. The printing method for forming the printed layer 2 can be, for example, an inkjet printing method in which ink droplets are sprayed from an inkjet head, or a gravure printing method that uses a recessed opposite surface.

[0023] The mass of the printing layer 2 is, for example, 11.8 [g / m 2 ] or less (solid amount) (organic mass 9.50 [g / m 2 ] or less), and preferably 8.36 [g / m 2 ] or less (solid amount) (organic mass 6.71[g / m 2 ] below).

[0024] <Surface protective layer> The surface protection layer 3 is laminated on one side of the printed layer 2 (the upper side in Figure 2), and is a layer formed from an acrylic resin-based paint to protect the surface of the decorative sheet 10 (the upper side in Figures 1 and 2). As the acrylic resin-based paint, for example, an acrylic resin having properties such as ultraviolet curing can be used.

[0025] Furthermore, the surface protective layer 3 may contain an inorganic additive (such as silica) if necessary. The surface protection layer 3 has a composition that contains, for example, acrylic resin in the range of 80 mass [%] to 86 mass [%] and inorganic additives in the range of 14 mass [%] to 20 mass [%].

[0026] The thickness of the surface protection layer 3 is, for example, 0.062 mm or less, and preferably 0.044 mm or less. The mass is 24.60 (g / m 2 ] or less (solid amount) (organic mass 19.70[g / m 2 ] or less), and preferably 17.49 ([g / m 2 ] or less (solid amount) (organic mass 13.97 [g / m 2 ] below). Here, in order to impart design, an uneven pattern may be formed on the surface of the surface protection layer 3. Examples of the uneven pattern that can be adopted include the vascular grooves of a wood grain board, the uneven surface of a stone plate (such as the cleavage surface of granite), the texture of a cloth surface, a matte finish, sand grain, hairline, etc. As a method for forming the uneven pattern, for example, an embossing method using a known sheet-fed or rotary embossing machine can be used.

[0027] <Primer layer> The primer layer 4 is laminated on one surface (the lower surface in FIG. 2) of the base layer 1, and is a layer formed of a urethane resin-based primer to improve adhesion. As the urethane resin-based primer, for example, a primer containing a urethane resin and an inorganic pigment (silica, etc.) can be used.

[0028] The composition of the primer layer 4 is, for example, a composition containing a urethane resin in the range of 56.2 to 68.5 and an inorganic pigment in the range of 34.0 to 41.4. The mass of the primer layer 4 is 2.48 [g / m 2 ] or less (solid amount) (organic mass 1.55 [g / m 2 ] or less), and preferably 1.76 [g / m 2 ] or less (solid amount) (organic mass 1.10 [g / m 2 ] below).

[0029] <Adhesive layer> The adhesive layer 5 is laminated on the other surface (the lower surface in Figure 2) of the primer layer 4, and is a layer formed using a synthetic resin-based adhesive to bond the glass cloth layer 6 and the decorative sheet 10. As the synthetic resin adhesive, for example, a two-component curing type ethylene-vinyl acetate copolymer resin adhesive or a two-component curing type urethane resin adhesive is used. As the ethylene-vinyl acetate copolymer resin-based adhesive, for example, an adhesive containing an ethylene-vinyl acetate copolymer resin and an inorganic pigment (silica, etc.) can be used.

[0030] The composition of the ethylene-vinyl acetate copolymer resin adhesive is, for example, a composition containing ethylene-vinyl acetate copolymer resin in the range of 80.3 mass [%] to 100 mass [%] and inorganic pigment (silica, etc.) in the range of 0 mass [%] to 19.7 mass [%]. The mass of the ethylene-vinyl acetate copolymer resin adhesive is 62.0 [g / m 2 ] or less (solid amount) (organic mass 62.0 [g / m 2 ] or less), and preferably 44.0 [g / m 2 ] or less (solid amount) (organic mass 44.0[g / m 2 ] below).

[0031] <Glass cloth layer> The glass cloth layer 6 is laminated on the other surface (the lower surface in FIG. 2) of the adhesive layer 5, and is formed using glass cloth. That is, the glass cloth layer 6 is laminated on one surface of the base material layer. Glass cloth is a cloth formed by weaving glass fibers. As the glass fibers, for example, E-glass or fibers containing a surface treatment agent (such as a sizing agent for improving adhesion, a silane compound, etc.) can be used.

[0032] The composition of the glass cloth (the composition of the glass fibers) is, for example, a composition containing E glass in the range of 97% by mass to 99% by mass, and a surface treatment agent in the range of 1% by mass to 3% by mass. The glass fibers are woven, for example, in a plain weave. The yarn count is, for example, 68.5 tex for the warp and 68.5 tex for the weft, and the weaving density is, for example, within the range of 42 threads / 25 mm to 46 threads / 25 mm for the warp and 31 threads / 25 mm to 35 threads / 25 mm for the weft.

[0033] The thickness of the glass cloth layer 6 is set within a range of, for example, 0.17 mm or more and 0.21 mm or less. The mass of the glass cloth layer 6 is, for example, 190.8 [g / m 2 ] or more 233.2[g / m 2 ] or less (organic mass 2.0 [g / m 2 ] or more than 6.4[g / m 2 ] within the following range.

[0034] <Opening> The multiple openings 7 are formed through the decorative sheet 10, which is a laminate formed by laminating a base material layer 1, a printing layer 2, a surface protective layer 3, a primer layer 4, an adhesive layer 5, and a glass cloth layer 6, in the direction in which the base material layer 1 and the glass cloth layer 6 are laminated. That is, the multiple openings 7 are formed through the laminate of the base material layer 1 and the glass cloth layer 6 in the direction in which the base material layer 1 and the glass cloth layer 6 are laminated. Moreover, the opening 7 is formed in a circular shape when viewed from the direction in which the base layer 1 and the glass cloth layer 6 are laminated.

[0035] The inner diameter of the opening 7 is within a range of 0.1 mm to 0.5 mm. The number of openings 7 is 16 [pieces / cm 2 ] or more 100[pcs / cm 2 ] is within the following range.

[0036] When forming the opening 7, a needle embossing plate is used on the laminate having the base layer 1, the printing layer 2, the surface protection layer 3, the primer layer 4, the adhesive layer 5, and the glass cloth layer 6 laminated thereon to form the opening 7 penetrating the laminate. In the first embodiment, a two-component curing ethylene-vinyl acetate copolymer resin adhesive or a two-component curing urethane resin adhesive is used as the synthetic resin adhesive that forms the adhesive layer 5. This makes it possible to prevent the synthetic resin adhesive from adhering to the needle embossing plate when the openings 7 are formed using the needle embossing plate, enabling stable production. Furthermore, in the first embodiment, the openings 7 are formed using a needle embossing plate, which makes it possible to reduce manufacturing costs compared to forming openings by irradiating with a laser, and also makes it possible to reduce the possibility of damage such as burning occurring to the decorative sheet.

[0037] The above-described first embodiment is one example of the present invention, and the present invention is not limited to the above-described first embodiment. Various modifications can be made depending on the design, etc., even if the modifications are in a form other than the first embodiment, as long as they do not deviate from the technical idea of ​​the present invention.

[0038] (Effects of the First Embodiment) The decorative sheet 10 of the first embodiment can provide the effects described below. (1) The laminate comprises a base layer 1 formed using a polyester-based resin, and a glass cloth layer 6 laminated on one side of the base layer 1 and formed using glass cloth, and an opening 7 is formed in the laminate of the base layer 1 and the glass cloth layer 6, penetrating the base layer 1 and the glass cloth layer 6 in the direction in which they are laminated. As a result, sound passing through the decorative sheet 10 from the base layer 1 side to the glass cloth layer 6 side is not reflected by the glass cloth layer 6, making it possible to provide a decorative sheet 10 that can suppress a decrease in sound absorption properties.

[0039] In addition, since the structure includes the glass cloth layer 6, it is possible to increase non-flammability compared to a structure formed by using a felt-based sound absorbing material instead of a glass cloth layer. Furthermore, since the structure includes the glass cloth layer 6, it is possible to suppress injury to the human body due to contact, compared to a structure formed by using glass wool instead of glass cloth.

[0040] (2) Opening 7 is formed in a circular shape, and the inner diameter of opening 7 is within the range of 0.1 mm to 0.5 mm. As a result, it is possible to suppress the decrease in sound absorbing properties compared to a configuration in which the inner diameter of the opening 7 is less than 0.1 mm. Also, it is possible to suppress the decrease in resistance that occurs when sound (sound waves) pass through the opening 7, and therefore it is possible to suppress the decrease in sound absorbing properties compared to a configuration in which the inner diameter of the opening 7 is more than 0.5 mm. Furthermore, it is possible to suppress the decrease in strength of the decorative sheet 10 compared to a configuration in which the inner diameter of the opening 7 is more than 0.5 mm.

[0041] (3) A plurality of openings 7 are formed in the laminate of the base layer 1 and the glass cloth layer 6, and the number of the openings 7 is 16 [pieces / cm 2 ] or more 100[pcs / cm 2 ] is within the following range. As a result, the number of openings 7 was set to 16 [pieces / cm 2 In comparison with a configuration in which the number of openings 7 is less than 100 [pieces / cm 2 In comparison with a configuration in which the number of openings 7 exceeds 100 [pieces / cm], it is possible to suppress the reduction in resistance that occurs when sound (sound waves) pass through the openings 7, and therefore it is possible to suppress the reduction in sound absorption properties. 2 ], it is possible to suppress a decrease in the strength of the decorative sheet 10.

[0042] (4) The substrate further includes a printed layer 2 laminated on the other surface of the substrate layer 1 and formed by printing with ink. As a result, compared to a configuration not including the printed layer 2, it is possible to impart to the decorative sheet 10 a design suited to the intended use of the decorative sheet 10.

[0043] Moreover, the sound-absorbing material 100 of the first embodiment can achieve the effects described below. (5) The decorative sheet 10 and the decorative board 30 are disposed at a distance from the decorative sheet 10 with one surface 30a facing the glass cloth layer 6. As a result, it is possible to provide a sound-absorbing material capable of suppressing a decrease in sound-absorbing properties. It becomes.

[0044] In addition, since the structure includes the glass cloth layer 6, it is possible to increase non-flammability compared to a structure formed by using a felt-based sound absorbing material instead of a glass cloth layer. Furthermore, since the structure includes the glass cloth layer 6, it is possible to suppress injury to the human body due to contact, compared to a structure formed by using glass wool instead of glass cloth.

[0045] (6) Further comprising a spacer 20 disposed between the decorative sheet 10 and the decorative board 30 and having a gap 40, the opening 7 being connected to the gap 40. In addition, the gap 40 and the opening 7 are connected to each other to form a continuous space from the surface of the decorative sheet 10 opposite the surface facing the spacer 20 to one surface 30a of the decorative board 30. As a result, the spacer 20 makes it possible to suppress changes in the distance R between the decorative sheet 10 and the decorative board 30, making it possible to stabilize the sound absorbing properties.

[0046] (7) The peak sound absorption coefficient measured using the reverberation room method in accordance with ISO 354 is 1600 [Hz] or less. As a result, it is possible to suppress the decrease in sound absorption properties for sounds with frequencies below 1600 [Hz], for example, in the range of 1500 [Hz] or more and 1600 [Hz] or less, i.e., sounds with frequencies corresponding to the range (vocal range) of the human voice.

[0047] (8) The distance between the decorative sheet 10 and the decorative board 30 is within the range of 10 mm to 50 mm. As a result, compared to a configuration in which the distance between the decorative sheet 10 and the decorative board 30 is less than 10 mm, it is possible to suppress a decrease in sound absorption properties particularly in the range of 1500 Hz or less. Furthermore, compared to a configuration in which the distance between the decorative sheet 10 and the decorative board 30 exceeds 50 mm, it is possible to prevent the partition or divider formed using the sound-absorbing material 100 from becoming large, and to prevent a decrease in sound absorption. This makes it possible to suitably use the sound-absorbing material 100 in closed spaces such as telework booths, for example.

[0048] (9) The distance between the decorative sheet 10 and the decorative board 30 is within the range of 30 mm or more and 50 mm or less. As a result, compared to a configuration in which the distance between the decorative sheet 10 and the decorative board 30 is less than 30 mm, it is possible to suppress a decrease in sound absorption properties particularly in the range of 1500 Hz or less. Furthermore, compared to a configuration in which the distance between the decorative sheet 10 and the decorative board 30 exceeds 50 mm, it is possible to prevent the partition or divider formed using the sound-absorbing material 100 from becoming large, and to prevent a decrease in sound absorption. This makes it possible to suitably use the sound-absorbing material 100 in closed spaces such as telework booths, for example.

[0049] <Modification of the first embodiment> (1) In the first embodiment, the sound-absorbing material 100 is configured to include the decorative sheet 10, the spacer 20, and the decorative board 30, but this is not limited thereto. That is, for example, as shown in FIG. 3, the sound-absorbing material 100 may be configured to include the decorative sheet 10 and the decorative board 30. Even in this configuration, the decorative sheet 10 is disposed relative to the decorative board 30 such that a gap is created between the decorative sheet 10 and the decorative board 30. Similarly to the first embodiment, the gap R between the decorative sheet 10 and the decorative board 30 is within a range of 10 mm to 50 mm, and preferably within a range of 30 mm to 50 mm.

[0050] (2) In the first embodiment, the opening 7 is circular when viewed from the direction in which the base layer 1 and the glass cloth layer 6 are laminated, but this is not limited thereto. That is, the opening 7 may be rectangular or angular when viewed from the direction in which the base layer 1 and the glass cloth layer 6 are laminated. EXAMPLES

[0051] With reference to the first embodiment, the sound-absorbing materials of Examples 1 to 3 and the sound-absorbing material of Comparative Example 1 will be described below.

[0052] Example 1 The decorative sheet was formed with adjacent openings spaced at a pitch of 2 mm and with an opening diameter of 0.3 mm. The spacer was formed using an aluminum frame with a vertical length of 600 mm, a horizontal length of 600 mm, and a thickness of 30 mm, so that the distance between the decorative sheet and the decorative plate was 30 mm.

[0053] The decorative panel was formed by laminating an olefin sheet onto a 3 mm thick calcium silicate board. In this manner, the sound-absorbing material of Example 1 was formed.

[0054] Example 2 A sound-absorbing material of Example 2 was formed in the same manner as in Example 1, except that the distance between the decorative sheet and the decorative plate was 40 mm.

[0055] Example 3 A sound-absorbing material of Example 3 was formed in the same manner as in Example 1, except that the distance between the decorative sheet and the decorative plate was 50 mm.

[0056] Comparative Example 1 A polyester nonwoven fabric having a thickness of 0.2 mm that had been inkjet printed was bonded to a polyester sound-absorbing material having a thickness of 7 mm using a synthetic rubber adhesive to form the sound-absorbing material of Comparative Example 1. Note that the polyester sound-absorbing material used was "White Quon" manufactured by Tokyo Bouon Co., Ltd., the polyester nonwoven fabric used was "Eltas E05050" manufactured by Asahi Kasei Corporation, and the synthetic rubber adhesive used was "Z-3" manufactured by Konishi Co., Ltd.

[0057] (Performance evaluation) The sound absorbing effects of the sound absorbing materials of Examples 1 to 3 and the sound absorbing material of Comparative Example 1 were measured and evaluated. The measurement results are shown in Table 1 and Fig. 4. The frequencies measured were mainly in the range of 400 [Hz] to 5000 [Hz], and the values ​​shown in the columns of 6300 [Hz], 8000 [Hz], and 10000 [Hz] in Table 1 are for reference only. To measure the sound absorption effect, two pieces of sound-absorbing material were placed in a small reverberation chamber made by Nippon Acoustic Engineering, and the reverberation chamber method of measuring sound absorption coefficient using impulse response in accordance with ISO354 was used. [Table 1]

[0058] (Evaluation Results) As a result of evaluating various performance characteristics using the above-mentioned method, it was confirmed that the sound-absorbing materials of Examples 1 to 3 have a higher sound absorption coefficient in the range of 1500 Hz or less, which corresponds to the human voice, compared to the sound-absorbing material of Comparative Example 1, as shown in FIG. In Fig. 4, the vertical axis indicates the sound absorption coefficient measured using the reverberation room sound absorption coefficient measurement (reverberation room sound absorption coefficient), and the horizontal axis indicates the center frequency of the 1 / 3 octave band (1 / 3 octave band center frequency). The 1 / 3 octave band center frequency corresponds to "frequency" in Table 1.

[0059] The present technology can be configured as follows. (1) A base layer formed using a polyester-based resin, and a glass cloth layer laminated on one surface of the base layer and formed using glass cloth, A laminate of the base material layer and the glass cloth layer has an opening formed therein, the opening penetrating the base material layer and the glass cloth layer in the direction in which the base material layer and the glass cloth layer are laminated. (2) The opening is formed in a circular shape, The decorative sheet according to (1) above, wherein the inner diameter of the opening is within a range of 0.1 mm or more and 0.5 mm or less. (3) A plurality of the openings are formed in the laminate of the base material layer and the glass cloth layer, The number of the openings is 16 / cm 2 More than 100 pieces / cm 2 A decorative sheet according to (1) or (2) above, which is within the following range: (4) The decorative sheet according to any one of (1) to (3) above, further comprising a printed layer laminated on the other surface of the base layer and formed by printing with ink. (5) A decorative sheet according to any one of (1) to (4) above, and a decorative plate arranged at a distance from the decorative sheet with one surface facing the glass cloth layer. (6) Further comprising a spacer disposed between the decorative sheet and the decorative plate and having a gap, The opening is connected to the gap, An acoustic material as described in (5) above, in which the void portion and the opening portion, which are connected to each other, form a continuous space from the surface of the decorative sheet opposite the surface facing the spacer to the one surface of the decorative panel. (7) The sound-absorbing material according to (5) or (6) above, having a peak sound absorption coefficient of 1600 Hz or less as measured by a reverberation room method in accordance with ISO354. (8) The sound-absorbing material according to any one of (5) to (7) above, wherein the distance between the decorative sheet and the decorative plate is within a range of 10 mm or more and 50 mm or less. (9) The sound-absorbing material according to (8) above, wherein the distance between the decorative sheet and the decorative plate is within a range of 30 mm or more and 50 mm or less. [Explanation of symbols]

[0060] Reference Signs List 1...base material layer, 2...printed layer, 3...surface protection layer, 4...primer layer, 5...adhesive layer, 6...glass cloth layer, 7...opening, 10...decorative sheet, 20...spacer, 30...decorative board, 40...gap, 100...sound absorbing material

Claims

1. A base layer formed using a polyester-based resin, and a glass cloth layer laminated on one surface of the base layer and formed using glass cloth, A laminate of the base material layer and the glass cloth layer has an opening formed therein, the opening penetrating the base material layer and the glass cloth layer in the direction in which the base material layer and the glass cloth layer are laminated.

2. The opening is formed in a circular shape, 2. The decorative sheet according to claim 1, wherein the inner diameter of the opening is within a range of 0.1 mm to 0.5 mm.

3. A plurality of the openings are formed in the laminate of the base material layer and the glass cloth layer, The number of the openings is 16 / cm ２ More than 100 pieces / cm ２ 2. The decorative sheet according to claim 1, wherein the content of the decorative sheet is within the following range:

4. 2. The decorative sheet according to claim 1, further comprising a printed layer laminated on the other surface of said base layer and formed by printing with ink.

5. A decorative sheet according to any one of claims 1 to 4, and a decorative plate arranged at a distance from the decorative sheet with one surface facing the glass cloth layer.

6. Further comprising a spacer disposed between the decorative sheet and the decorative plate and having a gap, The opening is connected to the gap, The sound-absorbing material described in claim 5, wherein the gap and the opening are connected to each other to form a continuous space from the surface of the decorative sheet opposite the surface facing the spacer to the one surface of the decorative panel.

7. 6. The sound-absorbing material according to claim 5, wherein the peak of the sound absorption coefficient measured by a reverberation room method in accordance with ISO 354 is 1600 Hz or less.

8. 6. The sound absorbing material according to claim 5, wherein the distance between the decorative sheet and the decorative plate is within a range of 10 mm to 50 mm.

9. 9. The sound absorbing material according to claim 8, wherein the distance between the decorative sheet and the decorative plate is within a range of 30 mm to 50 mm.

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