JP2022167081A - Sound-absorbing decorative board - Google Patents

Abstract

To provide a sound-absorbing decorative board that can be used, for example, in a telework booth, and is suitable for an enclosed space such as a booth, simplifying the sound-absorbing structure and improving the decorativeness.SOLUTION: A sound-absorbing decorative board 10 is provided with a decorative board body 20 having a hollow part 21 the front face thereof is opened, and a surface member 30 that seals the front face of the decorative board body 20 and having a plurality of openings 31 penetrating front and rear surfaces and opening to the hollow part 21. A honeycomb-shaped core material 50 is housed in the hollow part 21 of the decorated board body 20, and the front surface member 30 includes a picture pattern layer 30b for decorating the front surface side of the decorated board body 20. A surface protective layer 30d to which an antiviral additive is added is formed on the surface side of the surface member 30, and the amount of the antiviral additive may be 0.2 mass% or more and 10 mass% or less based on the solid content of the surface protective layer 30d.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sound-absorbing decorative board that can be used, for example, in a telework booth, and can provide a sound environment suitable for closed spaces such as booths.

Due to the corona crisis, it is almost impossible to gather in a large number of people in a conference room and have a meeting like before.
Meetings have also changed to video conferences, and the introduction of telework booths is increasing in offices.
Telework booths are sold by various companies, but there are few that emphasize the sound environment inside the telework booth.
Acoustic radiation structures (Patent Document 1) and acoustic structures (Patent Document 2) that absorb and scatter sound are conventionally known as measures against acoustic environments.

The conventional acoustic radiation structure described above is composed of a plurality of seven pipes (cavity forming members) (see paragraph [0017] and FIG. 1 of Patent Document 1).
Further, in the conventional acoustic structure described above, a plurality of 10 square tubular decorative board bodies extending in one direction are aligned in the direction perpendicular to the extending direction so that the positions of both end portions of the decorative board bodies are aligned. They are arranged individually (see paragraph [0011] and FIG. 1 of Patent Document 2).

Japanese Patent No. 3475917 Japanese Patent No. 5326946

However, the conventional acoustic radiation structure (Patent Document 1) and acoustic structure (Patent Document 2) have a complicated structure, and the pipe (cavity forming member) and the rectangular tubular decorative board main body are exposed to the outside. There was the first problem that
In addition, the conventional ones are not intended for use in telework booths, but consider the sound balance, not a specific frequency range, but the entire frequency range in a well-balanced manner, so there is no problem in telework booths. There is a second problem that the sound absorption coefficient in the frequency range of the human voice is not high.

On the other hand, a certain amount of sound absorbing material is necessary to suppress the echo of sound in the telework booth, but if there is a lot of sound absorbing material, there is a disadvantage that the ears feel uncomfortable.
There is an example of using only sound absorbing material (felt alone), but the design was not good.
In addition, it is necessary to consider the use of the telework booth by an unspecified number of people, and to consider the need to prevent infection with the new coronavirus (COVID-19).
Therefore, in view of the first and second problems described above, the present invention aims at simplifying the structure, improving the design, and suppressing the reverberation of one's own voice.

A sound-absorbing decorative board according to an aspect of the present invention includes a decorative board body having a hollow portion inside and a front surface of the hollow portion being opened, a decorative board body closing the front surface of the decorative board body, and penetrating through the front and back surfaces, and a surface member having a plurality of openings opening into the hollow portion, wherein a honeycomb-shaped core material is accommodated in the hollow portion of the decorative board body, and the surface member includes and a picture pattern layer for decorating the surface side of the decorative board body.
Further, in the sound absorbing decorative board according to one aspect of the present invention, a surface protective layer to which an antiviral additive is added is formed on the surface side of the surface member, and the amount of the antiviral additive added is It is characterized by being 0.2% by mass or more and 10% by mass or less with respect to the solid content of the protective layer.

A sound absorbing decorative board according to an aspect of the present invention is provided with a back surface member including a picture pattern layer that closes the back surface of the hollow portion and decorates the back surface side, on the back side of the decorative board main body. A surface protective layer to which an antiviral additive is added is formed on the surface side of the member, and the amount of the antiviral additive added is 0.2% by mass or more and 10% by mass relative to the solid content of the surface protective layer. % or less.
In the sound absorbing decorative board according to one aspect of the present invention, the core material includes a wall portion and a plurality of holes partitioned by the wall portion and penetrating the decorative board body in the front-rear direction, and the cross section of the hole is a honeycomb shape.
A sound-absorbing decorative board according to an aspect of the present invention is characterized in that a hole penetrating the wall in a thickness direction and opening to the hole is provided in the wall.

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, it is possible to simplify a sound absorbing structure, improve decorativeness, and suppress reverberation of one's own voice in a telework booth, for example.

1 is a cross-sectional view of a sound-absorbing decorative board according to Embodiment 1, in which a decorative board main body, a surface member, and a back member are positioned apart from each other. In the same figure, it is a partially enlarged view of the surface member surrounded by the dashed-dotted line a, and a partially enlarged view of the back side member surrounded by the dashed-dotted line b. 1 is a perspective view of a decorative board body according to Embodiment 1. FIG. 1 is a partial perspective view of a core material according to Embodiment 1. FIG. The surface member concerning Embodiment 1 is shown, (a) is a top view, (b) is a side view, (c) is a bottom view. The decorative board main body concerning Embodiment 1 is shown, (a) is a top view, (b) is a side view, (c) is a bottom view. 1 shows a back surface member according to Embodiment 1, where (a) is a plan view, (b) a side view, and (c) a bottom view. FIG. BRIEF DESCRIPTION OF THE DRAWINGS The sound-absorbing decorative board concerning Embodiment 1 is shown, (a) is a top view, (b) is a side view, (c) is a bottom view. 4 is a chart showing measurement results of an acoustic camera in an open booth for Example 1 and Comparative Examples 1 to 3. FIG. 4 is a chart showing measurement results of an acoustic camera in a telework booth for Example 1 and Comparative Examples 1 to 3. FIG. 4 is a chart showing evaluation results of Example 1 and Comparative Examples 1 to 3. FIG.

(Embodiment 1)
An embodiment of the present invention will now be described primarily with reference to FIG.
Here, the drawings are schematic, and the relationship between the thickness and the planar dimension, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiments shown below are examples of configurations for embodying the technical idea of the present invention. It does not specify anything. The technical idea of the present invention can be modified in various ways within the technical scope defined by the claims.

(Sound absorbing decorative board 10)
In FIG. 1, 10 is a sound-absorbing decorative board, and the sound-absorbing decorative board 10 is installed in a closed space such as a telework booth to reduce noise by absorbing sound and scattering sound, thereby improving the sound environment in the closed space. used to
As shown in FIGS. 1 to 3, the sound-absorbing decorative board 10 is roughly divided into (1) a decorative board body 20, (2) a surface member 30, (3) a back member 40, and (4) a core member 50. .
The sound absorbing decorative board 10 is not limited to the above (1) to (4). For example, instead of the back member 40, a back board (not shown) may be used to close the back of the hollow portion 21. Also, the above (1) to (4) will be described later.

(Decorative board main body 20)
As shown in FIGS. 1, 2 and 5, the decorative board body 20 has a hollow portion 21 inside, and the front surface of the hollow portion 21 is open.
The decorative board body 20 is made of wood, for example, and is roughly divided into (1) an upper and lower frame 22 and a lower frame 23, (2) left and right side frames 24 and 25, and (3) a front plate located in the front of the frame. 26.
Note that although the decorative board main body 20 is made of wood as an example, it is not limited to this, and may be made of resin or metal, although not shown.
The decorative board main body 20 is formed by framing an upper and lower frame 22, a lower frame 23, and left and right side frames 24 and 25. - 特許庁The front and rear sides of the frame are open. The front and rear surfaces of the decorative board body 20 are closed by a surface member 30 and a back surface member 40 to adopt a flush structure.
The hollow part 21 is surrounded on all sides by an upper and lower frame 22, a lower frame 23, and left and right side frames 24, 25, and the front and rear surfaces thereof are closed and sealed by a surface member 30 and a back surface member 40.例文帳に追加

(Size of decorative board main body 20)
The size of the decorative board main body 20 is, for example, 3 shaku (900 mm) or less in width in consideration of the assumption in the telework booth.
As for the height, it is set to a range that absorbs human voices, for example, a height of 900 mm or less, since it is used on a desk in consideration of working while sitting on a chair.
As a practical example, the size is set to about 850 mm in height, about 550 mm in width, and about 25 mm in thickness.
5 (a) to (c), for example, each dimension of a (850 mm), b (35 mm), d (550 mm), i (40 mm), j (215 mm), k (470 mm), l (20 mm) are shown respectively.

(Core material 50)
A core member 50 shown in FIG. 3 is accommodated in the hollow portion 21 .
The core member 50 is configured by connecting hollow cylindrical cells 51 to each other to form a honeycomb structure.
The material of the cells 51 is, for example, paper, but other materials such as metal, plastic, and foam can be used.
The core material 50 is composed of a continuously molded laminated core material such that cells 51 of different sizes form a bias-like structure when, for example, a corrugated cardboard sheet is unfolded.

Each cell 51 includes a wall portion 52 and a plurality of holes 53 partitioned by the wall portion 52 and penetrating the decorative board body 20 in the front-rear direction. The hole 53 has a honeycomb-shaped cross section.
Although the cross-sectional shape of the hole 53 is illustrated as square, it is not limited to this, and may be circular, triangular, hexagonal, or polygonal.
The wall portion 52 is provided with a hole 54 passing through the wall portion 52 in its thickness direction and opening to the hole 53 .
The hole 54 is formed in a circular shape of about 5 mm, for example. The contact area of the core material 50 can be enlarged by the hole 54 .
Although one hole 54 is formed in the wall portion 52, the number is limited and a plurality of holes may be provided.
As the core material 50, for example, "Dancore" manufactured by New Japan Feathercore Co., Ltd. is used.

(Size of core material 50)
The amount and type of core material 50 to be added may be changed according to the frequency range of the sound to be absorbed.
The size of the core material 50 indicates, for example, the length L, width W, and thickness C of the core material 50, and the lateral width A and depth B of the cells 51, respectively, in FIG.

(Front member 30, back member 40)
The surface members 30 and 40 are obtained by bonding a decorative sheet such as an olefin sheet to one side surface of a wooden base material 30a and 40a having a thickness of about 2.5 mm, for example, using an adhesive or the like (Fig. 1, Figures 4 and 6).
The decorative sheet is not limited to the olefin sheet, and may be a decorative sheet such as paper or polyvinyl chloride (PVC). The surface protective layers 30d and 40d that protect the surfaces of the surface members 30 and 40 may be decorative sheets to which an antibacterial/antiviral additive is added. Further, the base materials 30a and 40a are not limited to wood, and may be plastic resin plates, steel plates, aluminum plates, paperboards, or the like. Further, the substrates 30a and 40a and the sheet may be adhered using a double-faced tape or a decorative sheet whose back is tacked instead of an adhesive.

(Surface member 30)
As shown in FIGS. 1 and 4, the surface member 30 is positioned on the front side of the decorative board main body 20 and has a plurality of, for example ten, openings 31 each opening into the hollow portion 21 .
The surface member 30 also includes a picture pattern layer 30b that closes the front surface of the hollow portion 21 and decorates the surface side of the decorative board body 20. As shown in FIG.
A surface protective layer 30d to which an antiviral additive is added is formed on the surface side of the surface member 30 .
The surface member 30 is fixed to the front surface of the outer frame member 50 using, for example, double-sided tape or the like, and closes the open front surface of the outer frame member 50 .

(Size of surface member 30)
4 (a) to (c), for example, a (850 mm), b (65 mm), c (80 mm), d (550 mm), e (62 mm), f (43 mm), g (80 mm), h ( 2.5 mm).
(Structure of surface member 30)
The surface member 30 is roughly divided into (1) a substrate 30a, (2) a pattern layer 30b, (3) a transparent layer 30c, (4) a surface protection layer 30d, (5) an adhesive layer 30e, and (6) a board. A member 30f is provided.
The configuration of the surface member 30 is not limited to (1) to (6). Although not shown, for example, a primer layer may be provided between the surface protective layer 30d and the adhesive layer 30e, or An embossed portion may be provided on the side. Also, the surface member 30 may omit the adhesive layer 30e and the board member 30f. Furthermore, (1) to (6) will be described later.

(Opening 21)
As shown in FIGS. 1 and 4, the openings 31 are located in the surface member 30 and open to the hollow portions 21. For example, ten openings 31 are formed.
The openings 31 are formed so that vertically adjacent ones are staggered. Further, the hollow portion 21 is formed so as to deviate from the center of the sound absorbing decorative board 10 in the width direction. The positions of the openings 31 are related to the frequency range of the sound to be absorbed, and the positions of the openings 31 are made different in order to widen the frequency range.
The opening 31 penetrates the front and back surfaces of the surface member 30 , one end of the opening 31 is open to the front surface, and the other end is open to the back surface, that is, the hollow portion 21 . The opening 31 is formed in a circular shape with a diameter of Φ30 mm, for example.
Although the opening 31 has been illustrated as having a circular plane shape, it is not limited to this, and may be formed in an elliptical shape or a rectangular shape.
As shown in FIG. 1, a mesh 32 is adhered to the back surface of the surface member 30 at the position of the opening 31 . The mesh 32 is for preventing dust and dirt from entering the hollow portion 21 through the opening 31 .

(Back member 40)
The back member 40 is located on the back side of the decorative board body 20 and closes the hollow portion 21, as shown in FIGS.
Unlike the front member 30, the back member 40 does not have an opening 31. As shown in FIG.
The back member 40 is provided for the purpose of decorating the back side of the decorative board main body 20 .
Further, the back member 40 includes a picture pattern layer 40b similarly to the surface member 30, and a surface protective layer 40d to which an antiviral additive is added is formed on the surface side.
The back member 40 is fixed to the back side of the decorative board main body 20 using, for example, double-sided tape.
In FIGS. 6A to 6C, for example, dimensions a (850 mm), b (65 mm), and h (2.5 mm) are shown.

Like the surface member 30, the back surface member 40 can be roughly classified into (1) a substrate 40a, (2) a pattern layer 40b, (3) a transparent layer 40c, (4) a surface protective layer 40d, and (5) an adhesive. Layer 40e, (6) comprising board member 40f.
The back member 40 is not limited to (1) to (6), and although not shown, for example, a primer layer may be provided between the surface protective layer 40d and the adhesive layer 40e, or a primer layer may be provided on the surface side of the surface protective layer 40d. An embossed portion may be provided. Further, the back surface member 40 may omit the adhesive layer 40e and the board member 40f. Furthermore, since the configurations (1) to (6) are the same as those of the surface member 30, the description thereof will be omitted.

(Base material 30a)
The base material 30a serves as a support for the surface member 30, and specifically, a colored sheet made of an olefin material is used.
(Pattern layer 30b)
The pattern layer 30b decorates the surface side of the surface member 30. As shown in FIG.
That is, the pattern layer 30b is formed on the surface of the base material 30a by using a printing method, and is provided for the purpose of imparting a design to the surface member 30. As shown in FIG.
Examples of printing methods include gravure printing, offset printing, letterpress printing, flexographic printing, screen printing, inkjet printing, and electrostatic printing.
In addition, the printing method is not limited to the printing methods exemplified above, and for example, the hand-painting method, the suminagashi method, the transfer method, the photography method, the electrophotography method, the photosensitive resin method, the vacuum deposition method, the chemical corrosion method, and the thermosensitive coloring method. Any conventionally known image forming means such as a discharge destruction method can be applied.

The type of pattern of the picture pattern layer 30b is arbitrary depending on the purpose of use, user's preference, etc. For example, a wood grain pattern, a stone grain pattern, an abstract pattern, and the like are common. The type of pattern is not limited to the types exemplified above, and may be, for example, solid printing on the entire surface.
As the printing ink used in the printing method, for example, vinyl chloride acetate-based ink (cyan, magenta, yellow) is used.
As the printing ink, a polyvinyl chloride-based ink was exemplified, but it is not limited to this. Appropriate additives such as stabilizers, dispersants, antifoaming agents, leveling agents, surfactants, desiccants, and solvents or diluents are dispersed in a binder made of synthetic resin or the like. be.

(Transparent layer 30c)
The transparent layer 30c is laminated on the surface of the picture pattern layer 30b and is transparent, and the picture pattern layer 30b can be seen through the surface of the surface member 30. - 特許庁
The transparent layer 30c is made of a transparent thermoplastic resin, and it is preferable to add an ultraviolet absorber and a hindered amine light stabilizer to the transparent thermoplastic resin.
The kind of the transparent thermoplastic resin and the kind of the ultraviolet absorber to be added are not particularly limited.

(Surface protective layer 30d)
The surface protective layer 30d is located on the surface side of the surface member 30 and contains an antiviral additive.
The amount of the antiviral additive added is 0.2% by mass or more and 10% by mass or less with respect to the solid content of the surface protective layer 30d.
If the amount of the antiviral additive added is less than 0.2% by mass, the effect is not exhibited, and if it exceeds 10% by mass, the mechanical strength of the membrane may decrease.
The surface protective layer 30d is provided for the purpose of imparting surface physical properties such as abrasion resistance and water resistance to the surface of the surface member 30 .
The surface protective layer 30d is made of a transparent thermoplastic resin to which an ultraviolet absorber and a hindered amine light stabilizer are added.
The kind of the transparent thermoplastic resin and the kind of the ultraviolet absorber are not particularly limited.

(Adhesion layer 30e)
The adhesive layer 30e is located on the back surface side of the surface member 30 and is for bonding to a board member 30f, which will be described later.
(Board member 30f)
The board member 30 f serves as a support for the surface member 30 .

(Antiviral additive for surface protective layer 30d)
It is preferable that the active ingredient of the antiviral additive of the surface protective layer 30d is carried by an inorganic material.
This can improve the durability of the virus effect by carrying the active ingredient of the antiviral additive with the inorganic material.
Here, "glass" is used as the "inorganic material", but the "inorganic material" is not limited to glass.
The "active ingredient" of the antiviral additive corresponds to, for example, "silver", but is not limited thereto.
As an antiviral additive, for example, a silver-based inorganic additive (Biocide TB-B100) manufactured by Taisho Technos Co., Ltd. is used.
As an antiviral additive, a product of Taisho Technos Co., Ltd. was exemplified, but not limited to this, an antiviral agent (PTC-NT ANV additive (ST)) manufactured by Dainichiseika Kogyo Co., Ltd., and ( PTC-NT ANV additive (ST)) may also be used.

(Average particle size of antiviral additive)
The antiviral additive desirably satisfies the following formula (1), where "φ" is the average particle diameter and "D" is the thickness of the outermost surface protective layer 30d.
0.5D≦φ≦2D Expression (1)
When the relationship of the above formula (1) is established, the antiviral effect, that is, the antiviral property can be improved by increasing the contact area with the antiviral additive and by increasing the surface area of the antiviral additive itself.

(Particle size distribution of antiviral additive)
The antiviral additive preferably has two peaks in its particle size distribution, between 1 and 5 μm and between 5 and 10 μm.
By having two peaks in the particle size distribution, it is possible to expand the contact area with the antiviral additive and the surface area of the antiviral additive itself, so that the surface member 30 having an antiviral effect can be obtained. can.

(Addition amount of antiviral additive)
The antiviral additive is preferably added in an amount of 0.2% by mass or more and 10% by mass or less with respect to the solid content of the surface protective layer 30d.
This is because the amount of the antiviral additive added is 0.2% by mass or more and 10% by mass or less with respect to the solid content of the surface protective layer 30d, so that the surface member 30 having antiviral properties can be obtained. .
That is, when the amount is less than 0.2% by mass, the effect is not exhibited, and when the amount exceeds 10% by mass, the mechanical strength of the film is greatly affected.

(Additive for surface protective layer 30d)
The surface protective layer 30d may contain additives such as silicon components, fluorine components, waxes, anti-friction agents, etc., in order to impart functions to the decorative sheet.
This is because by adding a silicon-based component or a fluorine-based component to the outermost layer, the anti-fouling performance is improved, and viruses do not remain on the surface for a long period of time, resulting in improved antiviral properties.
The surface protective layer 30d preferably contains a surface active agent added to the surface protective layer 30d containing an antiviral additive.
This is because the addition of the surfactant improves the compatibility between the antiviral additive and the binder of the surface protective layer 30d, and reduces concentration variations due to precipitation of the antiviral additive during coating. can be suppressed.

(First characteristic point of the embodiment)
The first feature of the sound-absorbing decorative board 10 according to the embodiment is that the decorative board main body 20 has a hollow portion 21 inside and the front surface of the hollow portion 21 is open, and the front surface of the decorative board main body 20 is closed. , and a surface member 30 having a plurality of openings 31 that penetrate through the front and back surfaces and open to the hollow portion 21, wherein the hollow portion 21 of the decorative board body 20 has a honeycomb-shaped inside A core material 50 is accommodated, and the surface member 30 includes a picture pattern layer 30b for decorating the surface side of the decorative board body 20. - 特許庁

(Effect of first feature point)
According to the first characteristic point, first, the front and rear surfaces of the decorative board body 20 are covered with the surface member 30 and the back surface member 40 to adopt a flush structure, and the honeycomb-shaped core member 50 is provided in the hollow portion 21. By providing a plurality of openings 31 opening into the hollow portion 21 in the surface member 30, a sound absorbing structure can be obtained and the structure can be simplified.
According to the first characteristic point, secondly, the core material 50 is hidden by the surface member 30, and the pattern layer 30b of the surface member 30 can decorate the surface of the sound absorbing decorative board.
Therefore, according to the first characteristic point, it is possible to unify the sense of design with, for example, a telework booth.
According to the first characteristic point, thirdly, by using the honeycomb-shaped core material 50, it is possible to suppress the reverberation of one's own voice in, for example, a telework booth.
As a result, there is no echo of sound, and for example, the voice can be clearly heard by the other party of the teleconference.
According to the first characteristic point, fourthly, a special sound absorption can be achieved by simply storing a core material (not shown) in a door or furniture adopting a flush structure and opening an opening in the surface material. Sound can be absorbed without using materials, and a sound absorbing environment can be provided at a low cost.

(Second characteristic point of the embodiment)
A second feature of the sound absorbing decorative board 10 according to the embodiment is that a surface protective layer 30d to which an antiviral additive is added is formed on the surface side of the surface member 30, and the amount of the antiviral additive added is It is 0.2% by mass or more and 10% by mass or less with respect to the solid content of the surface protective layer 30d.
(Effect of second feature point)
According to the second feature, in a telework booth used by an unspecified number of people, droplets hit the sound absorbing decorative board 10 placed in front, but the antivirus layer can prevent virus infection.
If the amount of the antiviral additive added is less than 0.2% by mass, the effect is not exhibited, and if it exceeds 10% by mass, the mechanical strength of the membrane may decrease.

(Third Characteristic Point of Embodiment)
A third feature of the sound-absorbing decorative board 10 according to the embodiment is that, on the back side of the decorative board main body 20, there is a back member 40 including a picture pattern layer 40b that closes the back surface of the hollow portion 21 and decorates the back side. A surface protective layer 40d containing an antiviral additive is formed on the surface side of the back surface member 40, and the amount of the antiviral additive added is 0.2 with respect to the solid content of the surface protective layer 30d. It is more than mass % and below 10 mass %.

(Effect of third feature point)
According to the third characteristic point, by changing the front and back surfaces of the sound-absorbing decorative board 10, it is possible to unify the sense of design with that of the telework booth.
Further, according to the third characteristic point, the back surface member 40 can prevent virus infection. If the amount of the antiviral additive added is less than 0.2% by mass, the effect is not exhibited, and if it exceeds 10% by mass, the mechanical strength of the membrane may decrease.

(Fourth characteristic point of the embodiment)
A fourth feature of the sound-absorbing decorative board 10 according to the embodiment is that the core material 50 includes a wall portion 52 and a plurality of holes 53 partitioned by the wall portion 52 and penetrating the decorative board body 20 in the front-rear direction. and the cross-section of the hole 53 is honeycomb-shaped.
(Effect of fourth feature point)
According to the fourth characteristic point, the honeycomb shape is adopted, and in addition to the sound attenuation by the porous material, the sound is reflected in the hollow part 21, and the sound interference reduces the sound pressure. It is possible to reduce discomfort to the ears that occurs when only the sound absorbing material is used.

(Fifth characteristic point of the embodiment)
A fifth feature of the sound absorbing decorative board 10 according to the embodiment is that the wall portion 52 is provided with a hole 54 penetrating in the thickness direction thereof and opening to the hole 53 .
(Effect of fifth feature point)
According to the fifth characteristic point, the contact area of the core material 50 can be enlarged by the holes 53 .

Example 1 and Comparative Examples 1 to 3 of the sound absorbing decorative board 10 according to the present invention will be described below. The present invention is not limited to Example 1 below.
(Example 1)
Example 1 relates to Example 1, in which a surface member 30 and a back member 40 are adhered to the front and rear surfaces of a frame-shaped decorative board body 20, and a core material 50 is housed in a closed hollow portion 21. A sound absorbing decorative board 10 was manufactured.
The surface member 30 was provided with an opening 31 having a diameter of 30 mm.
For the core material 50, "Dancore" manufactured by New Japan Feathercore Co., Ltd. was used as a honeycomb material.
A hole 54 of about 5 mm was opened in the wall portion 52 of the honeycomb material to increase the contact area.
The size of the sound-absorbing decorative board 10 was set to approximately 850 mm in height×550 mm in width, and approximately 25 mm in thickness.
The sound-absorbing decorative boards 10 were arranged at predetermined positions (two places: an open booth and a telework booth).

(Comparative example 1)
Comparative Example 1 did not use the sound-absorbing decorative board 10 of Example 1.
(Comparative example 2)
In Comparative Example 2, instead of the sound-absorbing decorative board 10 of Example 1, an articulation panel manufactured by another company was arranged at a predetermined position.
(Comparative Example 3)
In Comparative Example 3, instead of the sound-absorbing decorative board 10 of Example 1, only a sound-absorbing material was arranged at a predetermined position.

(Evaluation method)
An acoustic test was conducted as an evaluation method, and (1) the sound pressure level was visualized using an acoustic camera, and (2) "confirmation of the ease with which the other party could hear the voice" was carried out.
The acoustic camera used was "SoundGraphy" manufactured by Nippon Acoustic Engineering.
Acoustic test The acoustic test used was conducted in (a) an open booth and (b) a telework booth.
The size of the open booth is 900 cm wide, 900 cm deep, and 2400 cm high, with a ceiling and a U-shape. The size of the telework booth is 900 cm wide, 1300 cm deep, and 1800 cm high, with a ceiling and a closed type.
For "confirmation of ease of hearing and ease of voice on the other side", a video conference was held in the telework booth to confirm the ease of hearing and ease of voice on the other side.

(Installation environment in the open booth in Figure 8)
As shown in FIG. 8, the evaluation criteria were as follows: in an open booth, white noise was emitted as a sound source from a point 600 mm away from the wall surface from a speaker placed on the bottom.
The acoustic camera measured the sound pressure level at a point 1 m away from the wall.
The measurement results were visualized at frequencies of 1000, 2000 and 4000 Hz (1/1 Oct, Band).
The sound pressure level at each point is displayed as "blue<green<yellow<red". In FIG. 8, the difference in "color" is represented by the density of "dots". "Blue" has a lower density, and towards "red" the density increases. A solid line is drawn at the boundary between colors for reference. Also, the background is a schematic diagram of the open booth.

On the wall surface, in Example 1, the sound absorbing decorative board 10 according to Example 1 is arranged, in Comparative Example 1, the sound absorbing decorative board 10 is not arranged, and in Comparative Example 2, an acoustic panel manufactured by another company is arranged. In 3, a sound absorbing material (width 600×300 mm) was installed.
Fig. 8 shows an open booth, in which three boards with wallpaper pasted on gypsum board are used, and decorative sound-absorbing boards 30, sound-absorbing boards made by other companies, and sound-absorbing boards are divided into sections divided into U-shapes. The material was placed on the ground and measured. Nothing is put on both sides, and it is still a gypsum board with wallpaper.

(Installation environment in the telework booth in Figure 9)
Fig. 9 shows a telework booth, where white noise was emitted from a speaker placed on the desk as a sound source from a point 600 mm away from the wall.
The acoustic camera measured the sound pressure level at a point 1 m away from the wall surface.
On the wall surface, the sound-absorbing decorative board 10 according to Example 1 is arranged, in Comparative Example 1 the sound-absorbing decorative board 10 is not arranged, in Comparative Example 2 an acoustic panel manufactured by another company is arranged, and in Comparative Example 3 both sides of the desk. And a sound absorbing material (width 600×300 mm) was installed in the front.

(Installation environment in the telework booth in Figure 10)
In FIG. 10, a video conference was held between Party A in the telework booth (no ceiling) at point A and Party B (teleconference partner) in the telework booth at point B (see FIG. 9).
We asked Mr. B (the teleconference partner) about (1) the feeling of discomfort when entering the telework booth.
We asked Mr. A about his impressions of how easy it was to hear Mr. B's voice.
On the wall surface, the sound-absorbing decorative board 10 according to Example 1 is arranged, in Comparative Example 1 the sound-absorbing decorative board 10 is not arranged, in Comparative Example 2 an acoustic panel manufactured by another company is arranged, and in Comparative Example 3 both sides of the desk. And a sound absorbing material (width 600×300 mm) was installed in the front.
FIG. 10 shows the result when the decorative sound absorbing board 30 is installed in the telework booth in the first embodiment. The measurement result of the corresponding acoustic camera is shown in FIG. 9, and sound absorbing materials are arranged on both sides.

(Observation results inside the open booth in Figure 8)
The evaluation results of Example 1 and Comparative Examples 1 to 3 are shown in FIGS. 8 to 10. FIG.
Observation results in the open booth of FIG. 8 are as follows.
In Example 1 (with sound absorbing decorative board 10), in comparison with without sound absorbing decorative board (Comparative Example 1), it was observed that the sound pressure level at the measurement point was lowered by 1 to 2 dB at 2000 Hz or less.
Example 1 (with sound absorbing decorative board 10) was confirmed to have an equivalent sound pressure level (sound absorption level) in the vicinity of 1000 Hz, which is the frequency range of human speech, in comparison with other company's product (Comparative Example 2).
In Example 1 (with sound-absorbing decorative board 10), it was confirmed that the sound-absorbing material alone had a lower sound pressure level at 1000 Hz, which is the frequency range of human speech, when compared with the sound-absorbing material alone (Comparative Example 3).
However, in the case of Comparative Example 3 (sound absorbing material only), the sound was absorbed too much, and a slight discomfort was confirmed.

(Observation results inside the telework booth in Figure 9)
The observation results in the telework booth in FIG. 9 are as follows.
In Example 1 (with the sound absorbing decorative board 10), it was observed that the sound pressure level at the measurement point was lowered by 1 dB at 2000 Hz or less in comparison with the case without the sound absorbing decorative board (Comparative Example 1).
Example 1 (with sound-absorbing decorative board 10) is slightly inferior in sound pressure level (sound absorption level) in the vicinity of 1000 Hz, which is the frequency range of human speech, when compared with the competitor's product (Comparative Example 2).
In Example 1 (with sound-absorbing decorative board 10), it was confirmed that the sound-absorbing material alone had a lower sound pressure level at 1000 Hz, which is the frequency range of human speech, when compared with the sound-absorbing material alone (Comparative Example 3).
However, in the case of Comparative Example 3 (sound absorbing material only), the sound was absorbed too much, and a slight discomfort was confirmed.
Since it is a closed space surrounded on all sides, the sound absorption performance in the low frequency range (1000 Hz) is lower than when placed in an open booth (see FIG. 8).

(In the telework booth in Figure 10, the results of a survey on the ease of hearing of the other party on the TV conference)
Regarding the "uncomfortable feeling when entering the telework booth", with the specification that does not contain any sound absorbing material (Comparative Example 1), the sound echoes and it is difficult for the telework partner to hear his/her own voice.
When the sound absorbing material is included, it becomes easier for the other party in the telework booth to hear (Example 1, Comparative Examples 2 and 3).
In the case of Comparative Example 3 (sound absorbing material only), on the contrary, the person inside the telework booth feels a little uncomfortable.

REFERENCE SIGNS LIST 10 sound-absorbing decorative board 20 decorative board body 21 hollow portion 22 upper frame 23 lower frame 24, 25 side frame 26 front plate 30 surface member 30a base material 30b pattern layer 30c transparent layer 30d surface protective layer 30e adhesive layer 30f board member 31 opening Part 32 Mesh 40 Back member 40a Base material 40b Pattern layer 40c Transparent layer 40d Surface protective layer 40e Adhesive layer 40f Board member 50 Core material 51 Cell 52 Wall 53 Hole 54 Hole W Width of core material L Core material Length C Core material thickness a Cell width b Cell depth

A sound-absorbing decorative board according to an aspect of the present invention includes a decorative board body having a hollow portion inside and a front surface of the hollow portion being opened, a decorative board body closing the front surface of the decorative board body, and penetrating through the front and back surfaces, and a surface member having a plurality of openings opening into the hollow portion, wherein a honeycomb-shaped core material is accommodated in the hollow portion of the decorative board body, and the surface member includes and a picture pattern layer for decorating the surface side of the decorative board body .
Further, in the sound absorbing decorative board according to one aspect of the present invention, a surface protective layer to which an antiviral additive is added is formed on the surface side of the surface member, and the amount of the antiviral additive added is the same as the surface protective layer. It is characterized by being 0.2% by mass or more and 10% by mass or less with respect to the solid content of the layer.

A sound absorbing decorative board according to an aspect of the present invention is provided with a back member including a picture pattern layer that closes the back surface of the hollow portion and decorates the back side on the back side of the decorative board main body, and the back member A surface protective layer to which an antiviral additive is added is formed on the surface side of the, and the amount of the antiviral additive added is 0.2% by mass or more and 10% by mass based on the solid content of the surface protective layer It is characterized by the following.
In the sound absorbing decorative board according to one aspect of the present invention, the core material includes a wall portion and a plurality of holes partitioned by the wall portion and penetrating the decorative board body in the front-rear direction, and the cross section of the hole is a honeycomb shape .
A sound-absorbing decorative board according to an aspect of the present invention is characterized in that a hole penetrating through the wall in a thickness direction and opening to the hole is provided in the wall.

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, it is possible to simplify a sound absorbing structure , improve decorativeness, and suppress reverberation of one's own voice in a telework booth, for example.

(Opening 31)
As shown in FIGS. 1 and 4, the openings 31 are located in the surface member 30 and open to the hollow portions 21. For example, ten openings 31 are formed.
The openings 31 are formed so that vertically adjacent ones are staggered. Further, the hollow portion 21 is formed so as to deviate from the center of the sound absorbing decorative board 10 in the width direction. The positions of the openings 31 are related to the frequency range of the sound to be absorbed, and the positions of the openings 31 are made different in order to widen the frequency range.
The opening 31 penetrates the front and back surfaces of the surface member 30, one end of the opening 31 opens to the surface,
The other end opens to the back surface, ie, the hollow portion 21 . The opening 31 is formed in a circular shape with a diameter of Φ30 mm, for example.
Although the opening 31 has been illustrated as having a circular plane shape, it is not limited to this, and may be formed in an elliptical shape or a rectangular shape.
As shown in FIG. 1, a mesh 32 is adhered to the back surface of the surface member 30 at the position of the opening 31 . The mesh 32 prevents dirt and dust from entering the hollow portion 21 through the opening 31 .

Claims (5)

a decorative board body having a hollow portion inside and having an open front surface of the hollow portion;
A sound absorbing decorative board comprising a surface member that closes the front surface of the decorative board body, penetrates through the front and back surfaces, and has a plurality of openings that open into the hollow portion,
A honeycomb-shaped core material is accommodated in the hollow portion of the decorative board body,
A sound-absorbing decorative board, wherein the surface member includes a picture pattern layer that decorates the surface side of the decorative board body. A surface protective layer to which an antiviral additive is added is formed on the surface side of the surface member,
2. The sound-absorbing decorative board according to claim 1, wherein the amount of the antiviral additive added is 0.2% by mass or more and 10% by mass or less relative to the solid content of the surface protective layer. On the back side of the decorative board main body, a back member including a picture pattern layer that closes the back surface of the hollow portion and decorates the back side is provided,
A surface protective layer to which an antiviral additive is added is formed on the surface side of the back member,
3. The sound-absorbing decorative board according to claim 1, wherein the amount of the antiviral additive added is 0.2% by mass or more and 10% by mass or less relative to the solid content of the surface protective layer. The core material includes a wall portion and a plurality of holes partitioned by the wall portion and penetrating the decorative board body in the front-rear direction,
The sound-absorbing decorative board according to any one of claims 1 to 3, characterized in that the cross section of said holes has a honeycomb shape. 5. The sound-absorbing decorative board according to claim 4, wherein the wall portion is provided with a hole penetrating in the thickness direction thereof and opening to the hole.

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