Sound-absorbing materials, partitions

Abstract

We provide sound-absorbing materials using charcoal, which has a low environmental impact. [Solution] The sound-absorbing material 10 includes a containment material 20 that forms a containment space 25 and granular biochar 26 filled inside the containment space 25.

Description

Technical Field

[0001] The present invention relates to a sound-absorbing material and a partition.

Background Art

[0002] Conventionally, glass wool has been widely used as a sound-absorbing material for buildings such as wall surfaces. On the other hand, for example, Patent Document 1 describes a sound-absorbing material for buildings formed by dividing the inside of a frame into a plurality of unit cells and storing carbon particles in the unit cells.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although a sound-absorbing material for buildings using carbon is known in this way, a sound-absorbing material that actively uses carbon from the perspective of environmental consideration is not known.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a sound-absorbing material using carbon with a small environmental load.

Means for Solving the Problems

[0006] According to one aspect of the present invention, there is provided a sound-absorbing material including a container material forming a plurality of accommodation spaces and granular biochar filled in each accommodation space. According to the above embodiment, since biochar is carbon-fixed, the environmental burden can be reduced. Furthermore, by using biochar, humidity control, VOC adsorption, and deodorizing effects can be obtained in the room. In addition, because the biochar is contained in multiple containment spaces, it is possible to prevent the granular biochar from shifting to the bottom due to gravity when installed on a wall.

[0007] According to one aspect of the present invention, the dimensions of the biochar are 0.5 to 1 mm. According to the above embodiment, the gaps in the biochar are spaced at intervals suitable for sound absorption across various frequency bands, thus achieving sound absorption performance over a wide frequency band.

[0008] According to one aspect of the present invention, the thickness of the containment space is 25 to 50 mm. According to the above embodiment, sound absorption performance equivalent to that of glass wool can be obtained.

[0009] According to one aspect of the present invention, the area of ​​the sound-absorbing material is 0.25 to 1 m². 2 That is Although biochar has a larger mass per unit volume compared to glass wool, the above configuration allows for easy transport by people. Furthermore, the sound-absorbing material becomes lighter, enabling installation with staples or adhesive without the need for a base material.

[0010] According to one aspect of the present invention, the storage material is formed in the shape of a box, and the internal space is divided into multiple storage spaces by partition plates. According to the above embodiment, since the containment space is divided into multiple sections, it is possible to prevent the biochar from becoming unevenly distributed due to gravity.

[0011] According to one aspect of the present invention, the storage material is formed by laminating a pair of sheets together, with a storage space formed between a portion of the sheets. According to the above embodiment, since it is constructed by laminating a pair of sheets together, it can be easily manufactured and is easy to install. In addition, because the containment space is separated, uneven distribution of biochar can be prevented. Furthermore, because the sheet is thin, the biochar accounts for the majority of the thickness of the sound-absorbing material, thus achieving both thinness and sound-absorbing performance.

[0012] According to one aspect of the present invention, the sound-absorbing material is an indoor sound-absorbing material. According to the above aspect, since the sound-absorbing material is an indoor sound-absorbing material, it can be used even in existing properties. Furthermore, the indoor humidity control effect, VOC adsorption effect, and deodorization effect can be obtained, improving the comfort of the room.

[0013] Also, according to one aspect of the present invention, a partition including the above sound-absorbing material is provided.

Advantages of the Invention

[0014] According to the present invention, a sound-absorbing material using charcoal with less environmental load can be provided.

Brief Description of the Drawings

[0015] [Figure 1] It is a perspective view showing a state where the sound-absorbing material according to the first embodiment of the present invention is attached indoors. [Figure 2] It is a longitudinal sectional view of the sound-absorbing material of the first embodiment. [Figure 3] It is a cross-sectional view of the sound-absorbing material of the first embodiment. [Figure 4] It is a graph showing the sound absorption rate of biochar and glass wool. [Figure 5] It is a perspective view showing the configuration of the sound-absorbing material according to the second embodiment. [Figure 6] It is a longitudinal sectional view showing the configuration of the sound-absorbing material according to the second embodiment. [Figure 7] It is a perspective view showing the sound-absorbing material of the third embodiment. [Figure 8] It is a longitudinal sectional view showing the sound-absorbing material of the third embodiment. [Figure 9] It is a view showing an application example of the sound-absorbing material of the fourth embodiment.

Modes for Carrying Out the Invention

[0016] Hereinafter, the sound-absorbing material according to the first embodiment of the present invention will be described.

[0017] Figure 1 is a perspective view showing how a sound-absorbing material according to the first embodiment of the present invention is installed in a room. As shown in Figure 1, the sound-absorbing material 10 is used by being attached to the interior side of the wall 1 of a building. The sound-absorbing material 10 is in the shape of a substantially square plate when viewed from the front, and in this embodiment, multiple sound-absorbing materials 10 are arranged in multiple rows vertically and horizontally and attached to the living space side of the wall. The sound-absorbing material 10 is attached to the interior surface of the wall 1 by adhesive or a stapler. In the embodiment shown in Figure 1, the sound-absorbing material 10 is attached to the interior surface of the wall 1, but it may also be installed on the living space side of the house, such as on the ceiling. Thus, the sound-absorbing material 10 is an interior sound-absorbing material that is installed on the interior side.

[0018] Figure 2 is a longitudinal cross-sectional view of the sound-absorbing material, and Figure 3 is a transverse cross-sectional view of the sound-absorbing material. The sound-absorbing material 10 includes a housing material and granular biochar filled into a housing space formed in the housing material 20. The housing material 20 is formed in a thin box shape, including a roughly square surface material 21 and a back material 22, and a side material 23 that connects the surface material 21 and the back material 22 around the entire circumference. The housing material 20 becomes plate-like when the biochar is housed inside. The housing material 20 also includes partition plates 24 that divide the internal space of the box shape. The partition plates 24 extend in multiple rows at equal intervals vertically and horizontally, with the front side of the partition plates 24 connected to the surface material 21 and the back side of the partition plates 24 connected to the back material 22. As a result, multiple roughly rectangular housing spaces 25 are formed inside the housing material 20, surrounded by the surface material 21, the back material 22, the partition plates 24, and the side material 23. The material used for the containment material 20 is one that does not allow biochar particles to pass through but allows air and moisture to pass through. Specifically, nonwoven fabric or a breathable waterproof sheet is used.

[0019] The biochar 26 is packaged without gaps within each containment space 25. In other words, the sound-absorbing material is composed of packages in which biochar is divided into multiple bags and connected vertically and horizontally. Biochar is granular charcoal discharged during biomass power generation. In other words, biochar is a carbon-based solid substance obtained by thermally decomposing biomass (plants, organic waste, etc.) in an environment with reduced oxygen supply, and is a carbonized material made from biological resources. For example, biochar is charcoal produced after using plants such as coconut husks as biomass fuel for power generation. When used as biomass fuel, the amount of carbon emitted is less than the amount of carbon stored, and carbon sequestration is performed with biochar. The average size of the biochar is preferably 0.5 to 1 mm. By using biochar in this way, not only is carbon sequestration possible, but improvements in the indoor environment can be achieved through humidity control, VOC adsorption, and deodorization effects. As shown in Figure 2, in this embodiment, the biochar 26 is packaged without gaps within each containment space 25, so even when mounted on a wall as shown in Figure 2, the uneven distribution of the biochar 26 due to gravity can be suppressed.

[0020] The thickness of the sound-absorbing material 10, i.e., the thickness of the containment space 25, is approximately 25 to 50 mm. The dimensions of each containment space 25 are 30 mm to 300 mm in both length and width. The area of ​​each sound-absorbing material 10 is 0.5 m². 2 Approximately (0.25m 2 ~1m 2 ) When Biochar 26 is filled, the weight per unit volume is greater than that of a glass wall, but the area of ​​the sound-absorbing material is 0.5m 2 By doing so, the weight of each sound-absorbing material can be reduced, making installation easier.

[0021] With such a sound-absorbing material 10, a sound-absorbing effect can be obtained using biochar. The sound-absorbing effect of biochar is achieved because there are countless tiny holes between the biochar, and as air travels through the continuous holes, the movement of air particles caused by sound waves is suppressed by friction between the holes and the air particles, and the kinetic energy is gradually lost.

[0022] The inventors experimentally confirmed that sound absorption can be obtained using biochar. In this experiment, biochar that had passed through a 0.6 mm sieve was used to a thickness of 25 mm, and a vertical incidence sound absorption coefficient test was performed using an acoustic tube. As a comparative example, a similar vertical incidence sound absorption coefficient test was also performed using an acoustic tube on 25 mm thick glass wool with a density of 32 k.

[0023] Figure 4 is a graph showing the sound absorption coefficients of biochar and glass wool. As shown in the figure, although the sound absorption coefficient of biochar (biochar 0.6 mm sieve t25) peaks at a frequency of 1.6 kHz, it showed a sound absorption effect greater than that of glass wool (GW32k_t25) below 2 kHz. Furthermore, even above 2.5 kHz, the sound absorption coefficient of biochar exceeded 0.8, demonstrating that biochar has a very high sound absorption coefficient.

[0024] According to this embodiment, the following effects are achieved. The sound-absorbing material 1 of this embodiment includes a containment material 20 that forms a containment space 25, and granular biochar 26 filled within the containment space 25. As a result, the biochar 26 is carbon-fixed, which reduces the environmental burden. Furthermore, by using biochar 26, humidity control, VOC adsorption, and deodorizing effects can be obtained in the room. In addition, since the biochar 26 is contained in multiple containment spaces 25, it is possible to prevent the granular biochar 26 from shifting downwards due to gravity when installed on a wall.

[0025] Furthermore, according to this embodiment, the dimensions of the biochar are 0.5 to 1 mm. This ensures that the gaps between the biochar are spaced appropriately for sound absorption across various frequency bands, thereby achieving sound absorption performance over a wide frequency range.

[0026] Furthermore, according to this embodiment, the thickness of the containment space 25 is 25 to 50 mm. This allows for sound absorption performance equivalent to that of glass wool.

[0027] Furthermore, according to this embodiment, the area of ​​the sound-absorbing material 10 is 0.25 to 1 m². 2Although biochar has a larger mass per unit volume compared to glass wool, the area of ​​sound-absorbing material is 0.25 to 1 m². 2 Therefore, it can be easily transported by people. The sound-absorbing material 10 is lightweight, and it can be installed with a stapler or adhesive without a base material.

[0028] Furthermore, according to this embodiment, the container 20 is formed in a box shape, and its internal space is divided into multiple storage spaces 25 by partition plates. In this way, since the storage spaces 25 are divided into multiple sections, uneven distribution of biochar can be prevented.

[0029] Furthermore, according to this embodiment, the sound-absorbing material 10 is attached to the living space side of the wall 1. This allows it to be used in existing properties. In addition, it provides humidity control, VOC adsorption, and deodorizing effects in the room, improving the comfort of the room.

[0030] Furthermore, according to this embodiment, since a sheet is used as the material for the containment material 20, the sheet is thin, and biochar accounts for the majority of the thickness of the sound-absorbing material, thus achieving both thinness and sound-absorbing performance.

[0031] In this embodiment, the base material is made of a sheet material, but the present invention is not limited thereto. Figures 5 and 6 show the configuration of the sound-absorbing material according to the second embodiment, with Figure 5 being a perspective view and Figure 6 being a longitudinal cross-sectional view. Note that in Figure 5, the breathable waterproof sheet and finishing cloth are omitted. As shown in Figure 5, the configuration of the containment material 120 of the sound-absorbing material 110 of the second embodiment differs from that of the first embodiment. The containment material 120 comprises a substantially square bottom surface 121, outer peripheral walls 122 erected along each side of the bottom surface 121, and partition plates 123 that divide the space enclosed by the bottom surface 121 and the outer peripheral walls 122. The internal space of the containment material 120 is divided into rectangular parallelepiped-shaped containment spaces 124 arranged vertically and horizontally by the partition plates 123. The containment material 120 is made of, for example, wood, aluminum, cloth, etc. Biochar 26 is filled into each containment space 124 separated by the partition plates 123. The top surface of the container 120 is sealed with a breathable waterproof sheet 125. Furthermore, a finishing cloth 126 is provided to cover the sides of the container 120 and the top surface of the breathable waterproof sheet. This configuration also achieves the same effects as the embodiment described above.

[0032] Furthermore, Figures 7 and 8 show the sound-absorbing material of the third embodiment, with Figure 7 being a perspective view and Figure 8 being a longitudinal cross-sectional view. As shown in Figures 7 and 8, the sound-absorbing material 210 of the third embodiment differs in the shape of the containment material 220. The containment material 220 is made by bonding together a pair of sheets 221 and 222, and a plurality of substantially circular containment spaces 212 are formed between the sheets 221 and 222. The portions of 221 and 222 that correspond to the containment spaces 212 are formed to protrude from the front and back surfaces. The containment spaces 212 are arranged in a staggered pattern, and the gaps between the containment sections 212 are minimized. The containment spaces 212 are filled with biochar. This configuration also produces the same effects as the above embodiment.

[0033] Furthermore, according to this embodiment, the containment material 120 is formed by laminating a pair of sheets together, with a containment space 212 formed between a portion of the sheets. Because of this configuration, it can be easily manufactured and is easy to install. In addition, because the containment space 212 is separated, it is possible to prevent the biochar from becoming unevenly distributed.

[0034] Furthermore, although the above embodiments described sound-absorbing materials attached to the surface of a wall, the uses of the sound-absorbing material of the present invention are not limited to this. Figure 9 shows an example of application of the sound-absorbing material according to the fourth embodiment. As shown in Figure 9, the sound-absorbing material 10 can also be used as a partition (screen, divider). As shown in Figure 9, the partition 300 comprises a U-shaped frame 310 and a base 320 provided at the end of the frame 310. The partition 300 is self-supporting because the base 320 is grounded. The sound-absorbing material 10 is fitted inside the frame 310. Note that the sound-absorbing material 10 is not limited to the sound-absorbing material of the first embodiment, but can also be the sound-absorbing material of the second or third embodiment. In the fourth embodiment, the sound-absorbing material was used as a partition installed on the floor, but it may also be installed on desks or shelves, or applied to foldable or movable partitions, etc. [Explanation of Symbols]

[0035] 1: Wall 10: Sound-absorbing material 20: Storage materials 21: Surface material 22: Backing material 23: Side material 24: Divider 25: Containment space 26: Biochar 110: Sound-absorbing material 120: Storage material 121: Bottom 122:Outer wall 123: Divider 124: Containment Space 125: Breathable waterproof sheet 126: Finishing cloth 210: Sound-absorbing material 220: Storage material 300: Partition 310: Frame material 320: Base

Claims

1. A storage material that forms multiple storage spaces, A sound-absorbing material comprising granular biochar filled into the aforementioned containment spaces.

2. The average size of the biochar is 0.5 to 1 mm. The sound-absorbing material according to claim 1.

3. The thickness of the aforementioned storage space is 25 to 50 mm. The sound-absorbing material according to claim 1.

4. The sound-absorbing material is in the form of a plate, The area of ​​the sound-absorbing material should be 0.25 to 1 m². 2 That is, The sound-absorbing material according to claim 1.

5. The aforementioned storage material is formed in the shape of a box, The internal space is divided into multiple storage spaces by partition plates. The sound-absorbing material according to claim 1.

6. The aforementioned storage material is made by joining together a pair of sheets. Multiple storage spaces are formed between parts of the seat. The sound-absorbing material according to claim 1.

7. The aforementioned sound-absorbing material is an indoor sound-absorbing material. The sound-absorbing material according to any one of claims 1 to 6.

8. It is a partition, A partition comprising the sound-absorbing material described in claim 1.

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