JPH04168495A - Sound absorbing material - Google Patents
Sound absorbing materialInfo
- Publication number
- JPH04168495A JPH04168495A JP2296195A JP29619590A JPH04168495A JP H04168495 A JPH04168495 A JP H04168495A JP 2296195 A JP2296195 A JP 2296195A JP 29619590 A JP29619590 A JP 29619590A JP H04168495 A JPH04168495 A JP H04168495A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- absorbing material
- powder material
- sound absorbing
- box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011358 absorbing material Substances 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 14
- 238000010521 absorption reaction Methods 0.000 abstract description 14
- 239000002245 particle Substances 0.000 abstract description 11
- 239000004744 fabric Substances 0.000 abstract description 8
- 239000000377 silicon dioxide Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 6
- 239000002023 wood Substances 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000378 calcium silicate Substances 0.000 abstract description 3
- 229910052918 calcium silicate Inorganic materials 0.000 abstract description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 3
- 239000010931 gold Substances 0.000 abstract description 3
- 229910052737 gold Inorganic materials 0.000 abstract description 3
- 239000010445 mica Substances 0.000 abstract description 3
- 229910052618 mica group Inorganic materials 0.000 abstract description 3
- -1 polyethylene Polymers 0.000 abstract description 3
- 229920000573 polyethylene Polymers 0.000 abstract description 3
- 229920006266 Vinyl film Polymers 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- 239000010440 gypsum Substances 0.000 abstract description 2
- 229910052602 gypsum Inorganic materials 0.000 abstract description 2
- 239000010409 thin film Substances 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract 1
- 239000011491 glass wool Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、リスニングルームや楽器練習室などの音響処
理に用いる吸音材に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound absorbing material used for acoustic treatment of listening rooms, musical instrument practice rooms, and the like.
リスニングルームや楽器練習室などにおける問題点に、
特定の周波数の音が強調されボンボンと響くブーミング
現象と呼ばれる現象がある。For problems in listening rooms and musical instrument practice rooms,
There is a phenomenon called booming, in which sounds at specific frequencies are emphasized and reverberate.
これは、発生する音の波長と部屋の大きさとの関係によ
り、部屋が音に共振して生じる現象である。This is a phenomenon that occurs when the room resonates with the sound due to the relationship between the wavelength of the generated sound and the size of the room.
すなわち、リスニングルームや楽器練習室などにおいて
、発生する２０乃至２０ＫＨｚの可聴領域の音の波長（
すなわち、１．７ＣＩ＋乃至１７ｍの波長）の中で、特
に低温域の音の波長が部屋の一辺の長さと同程度となる
ことに起因して生じるもので、通常、コンサートホール
のように室内空間が大きい場合には見られない現象であ
る。In other words, the wavelength of sound in the audible range of 20 to 20 KHz (
In other words, it occurs because the wavelength of sound in the low-temperature range is approximately the same as the length of one side of the room, and is usually found in indoor spaces such as concert halls. This is a phenomenon that cannot be seen when .
このブーミング現象を解消するためには、部屋の壁面に
おいて、低音域の音を吸音するようにすればよい。In order to eliminate this booming phenomenon, the walls of the room can absorb low-frequency sounds.
従来より吸音材としては第３図に示したように片側が開
口となっている箱１にグラスウール４を挿入し、その開
口をスピーカクロス５で閉塞したものや第５図に示した
ように片側が開口となっているｎｌに粉体２を充填し、
その開口をポリエチレンフィルム６で閉塞したものが知
られており、これを壁面に取り付けて用いている。Conventionally, sound absorbing materials include glass wool 4 inserted into a box 1 with an opening on one side as shown in Fig. 3, and the opening closed with a speaker cloth 5, and a sound absorbing material on one side as shown in Fig. 5. Fill the nl with the opening with powder 2,
It is known that the opening is closed with a polyethylene film 6, and this is used by attaching it to a wall surface.
上記従来技術において、グラスウールは多孔質の吸音材
であり、その吸音率の周波数特性は第４図に示すように
高音域では大きい吸音率を有するが低音域になるに従っ
て吸音率は小さくなるのでブーミング現象に対しては有
効な手段とはならない。なお、第４図は厚さ２０（ｍａ
）のグラスウールのものであり、厚くするに従って吸音
率の大きくなる周波数は低音域側になるが、その場合吸
音材の厚みが厚くなり部屋が狭くなるという問題がある
。In the above conventional technology, glass wool is a porous sound-absorbing material, and the frequency characteristics of its sound absorption coefficient are as shown in Figure 4. As shown in Figure 4, it has a large sound absorption coefficient in the high frequency range, but the sound absorption coefficient decreases as the frequency range goes down, resulting in booming. It is not an effective means to deal with the phenomenon. In addition, in Fig. 4, the thickness is 20 (ma)
) glass wool, and as the thickness increases, the frequency at which the sound absorption coefficient increases becomes lower frequencies, but in this case there is a problem that the thickness of the sound absorbing material becomes thicker and the room becomes narrower.
また、粉体の場合、第６図のように低音域において大き
い吸音率を有するがさらに低音域化を図ろうとすると厚
みを厚くする必要があり、部屋が狭くなるという問題が
ある。なお、第６図は平均粒径１００〔μｍ〕、かさ密
度０．２１７ Ｃｇ／’ｄｒ〕の湿式シリカを２０（ｍ
ｍ、ｌ厚にしたもののグラフである。In addition, in the case of powder, it has a large sound absorption coefficient in the low frequency range as shown in FIG. 6, but if you try to further lower the frequency range, it is necessary to increase the thickness, which causes the problem that the room becomes narrow. In addition, Figure 6 shows wet silica with an average particle size of 100 [μm] and a bulk density of 0.217 Cg/'dr.
This is a graph of m and l thicknesses.
本発明は上記問題点に鑑みてなされたものであり、その
目的とするところは薄型で、より低音域において吸音率
の大きな吸音材を提供することにある。The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a sound absorbing material that is thin and has a high sound absorption coefficient in a lower frequency range.
〔課題を解決するための手段〕
本発明は、例えば、第１図に示したように、片側が開口
となっている箱１に粉体２を自然状態の１．１〜１．４
倍のかさ密度に圧縮して充填し、その開口を音響的に透
明なシートで閉塞した吸音材であり、粉体としては、自
然状態でかさ密度が概ね１、ＯＯ［ｇ／ｃＴ１）以下の
粉体、例えば金マイカ、シリカ、アクリル超微粉体、タ
ルク、またはケイ酸カルシウム等を用い、好ましくは平
均粒径４０〔μｍ〕、かさ密度０．３７ ［ｇ／ｃＴ１
）の金マイカ、平均粒径１．７〜１５０〔μＩｒｌ］、
かさ密度０．０６〜０．２８（ｇ／Ｃ１１ｌ）の湿式シ
リカ、平均粒径３〜２８〔μｍ〕、かさ密度０．４４〜
０．９２（ｇ／ｃＴ１〕の球状シリカ、粒径１〜２〔μ
ｍ〕、かさ密度０．３０ （ｇ ／ｃｆｆｌ）のアクリ
ル超微粉体、平均粒径１．５〜９．４〔μｍ〕、かさ密
度０．２３〜０．４５（ｇ／ｃ＋１１）のタルク、また
は粒径２０〜３０〔μｍ〕、かさ密度０．０８ （ｇ
／ｃ１ｉＩ）のケイ酸カルシウムとし、シートとしては
通気性のある織物、例えばサランクロス、ガラスクロス
、あるいは厚さが概ね０．０５（ｍｍ）以下の薄膜、例
えばポリエチレンシート、ビニルフィルムとし、片側が
開口となっている箱としては、木材、石こうボード、ケ
イカル板、木毛セメント板または木片セメント板等で構
成されるものとしたものであり、外寸は概ね横幅３００
〜９００〔腸〕、高さ１８００〜２４００〔■〕の吸音
材である。[Means for Solving the Problems] The present invention, for example, as shown in FIG.
It is a sound absorbing material that is compressed and filled to double the bulk density, and the openings are closed with an acoustically transparent sheet.As a powder, the bulk density in its natural state is approximately 1, OO [g/cT1) or less. A material such as gold mica, silica, ultrafine acrylic powder, talc, or calcium silicate is used, preferably with an average particle size of 40 [μm] and a bulk density of 0.37 [g/cT1].
) gold mica, average particle size 1.7-150 [μIrl],
Wet silica with bulk density 0.06-0.28 (g/C11l), average particle size 3-28 [μm], bulk density 0.44-
Spherical silica of 0.92 (g/cT1), particle size 1-2 [μ
m], acrylic ultrafine powder with a bulk density of 0.30 (g/cffl), talc with an average particle size of 1.5 to 9.4 [μm], and a bulk density of 0.23 to 0.45 (g/c+11) , or particle size 20-30 [μm], bulk density 0.08 (g
/c1iI) calcium silicate, and the sheet is a breathable fabric such as Saran cloth, glass cloth, or a thin film with a thickness of approximately 0.05 (mm) or less, such as a polyethylene sheet or vinyl film, and one side is The open box is made of wood, gypsum board, Keikal board, wood wool cement board, wood chip cement board, etc., and its external dimensions are approximately 300mm wide.
It is a sound absorbing material with a height of ~900 [intestines] and a height of 1,800 to 2,400 [■].
本発明の吸音材は対象となる低音域の音に対して、粉体
の共振現象により音のエネルギを熱のエネルギに変換し
吸音するものであるが、自然状態より圧縮しているため
、自然状態の場合に対して低音域側で吸音する。The sound absorbing material of the present invention converts the sound energy into heat energy and absorbs the target low-frequency sound by the resonance phenomenon of the powder, but since it is compressed compared to its natural state, Sound is absorbed on the low frequency side compared to the case in which the sound is absorbed.
本発明の実施例を図に基づいて説明する。第２図は平均
粒径１００〔μｍ〕、かさ密度０．２１７（ｇ／ｃｄＬ
の湿式シリカを圧縮してかさ密度０゜２５７［ｇ／ｃｄ
）としたものの吸音率の周波数特性を表したグラフであ
る。この湿式シリカを粉体２として用い、木材製の箱１
内に入れ、開口をサランクロス（シート）３で閉塞した
のが本実施例である。第４図のグラスウールと比べると
低音域で大きな吸音率を有しており、さらに自然状態の
第６図と比べるとピークの周波数が３３０〔Ｈｚ：１か
ら２９５（Ｈｚ）へと低域化されていることがわかる。Embodiments of the present invention will be described based on the drawings. Figure 2 shows an average particle diameter of 100 [μm] and a bulk density of 0.217 (g/cdL).
Wet silica is compressed to give a bulk density of 0°257 [g/cd
) is a graph showing the frequency characteristics of the sound absorption coefficient. Using this wet silica as powder 2, a wooden box 1
In this embodiment, the opening was closed with saran cloth (sheet) 3. Compared to the glass wool in Figure 4, it has a large sound absorption coefficient in the low frequency range, and compared to the natural state in Figure 6, the peak frequency has been lowered from 330 [Hz: 1 to 295 (Hz)]. You can see that
本実施例では第１図の構成とすることにより第２図の吸
音性が得られる。In this embodiment, by adopting the configuration shown in FIG. 1, the sound absorption properties shown in FIG. 2 can be obtained.
本発明は、片側が開口となっている箱に粉体を充填し、
当該開口を音響的に透明なシートで閉塞した吸音材にお
いて、粉体を自然状態の１．１〜１゜４倍のかさ密度に
圧縮したことを特徴とする吸音材であるので、自然状態
で充填した粉体に対して薄型でより低音域において吸音
率の大きな吸音材が提供できる。The present invention involves filling a box with an opening on one side with powder,
In the sound absorbing material in which the opening is closed with an acoustically transparent sheet, the sound absorbing material is characterized by compressing powder to a bulk density of 1.1 to 1.4 times that in the natural state. It is possible to provide a sound absorbing material that is thinner than the filled powder and has a higher sound absorption coefficient in the lower sound range.
第１図及び第２図は本発明に係る実施例の一部切り欠き
斜視図及び吸音率の周波数特性を表したグラフ、第３図
及び第５図は従来例の一部切り欠き斜視図、第４図及び
第６図は従来例の吸音率の周波数特性を表したグラフで
ある。
１・・・箱、２・・・粉体、３・・・シート。1 and 2 are a partially cutaway perspective view of an embodiment according to the present invention and a graph showing the frequency characteristics of sound absorption coefficient; FIGS. 3 and 5 are partially cutaway perspective views of a conventional example; FIGS. 4 and 6 are graphs showing frequency characteristics of sound absorption coefficients in conventional examples. 1...Box, 2...Powder, 3...Sheet.
Claims (1)
口を音響的に透明なシートで閉塞した吸音材において、
粉体を自然状態の１．１〜１．４倍のかさ密度に圧縮し
たことを特徴とする吸音材。(1) In a sound-absorbing material in which a box with an opening on one side is filled with powder and the opening is closed with an acoustically transparent sheet,
A sound absorbing material characterized by compressing powder to a bulk density 1.1 to 1.4 times that of its natural state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2296195A JPH04168495A (en) | 1990-10-31 | 1990-10-31 | Sound absorbing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2296195A JPH04168495A (en) | 1990-10-31 | 1990-10-31 | Sound absorbing material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04168495A true JPH04168495A (en) | 1992-06-16 |
Family
ID=17830408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2296195A Pending JPH04168495A (en) | 1990-10-31 | 1990-10-31 | Sound absorbing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04168495A (en) |
-
1990
- 1990-10-31 JP JP2296195A patent/JPH04168495A/en active Pending
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