JPH0913943A - Heat insulating/sound absorbing material - Google Patents
Heat insulating/sound absorbing materialInfo
- Publication number
- JPH0913943A JPH0913943A JP18322795A JP18322795A JPH0913943A JP H0913943 A JPH0913943 A JP H0913943A JP 18322795 A JP18322795 A JP 18322795A JP 18322795 A JP18322795 A JP 18322795A JP H0913943 A JPH0913943 A JP H0913943A
- Authority
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- Prior art keywords
- sound absorbing
- heat insulating
- diameter
- holes
- heat
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主として内燃機関を有
する自動車・船等の輸送機械、土木・建設機械の耐熱性
を必要とする部分に使用される断熱吸音材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating and sound absorbing material which is mainly used for transportation machines such as automobiles and ships having an internal combustion engine, and for civil engineering and construction machines where heat resistance is required.
【０００２】[0002]
【従来の技術】内燃機関を有する各種の機械の防音対策
としては、その騒音の発生源である内燃機関、いわゆる
エンジンの部分を吸音性を有する材料によって覆ってし
まうのが一般的である。但し、吸音性のある材料は、エ
ンジンに近い場所に使用するとエンジンから発生する熱
によって吸音基材が劣化する虞れがあり、この場合には
著しく商品性を低下させてしまう。2. Description of the Related Art As a soundproofing measure for various machines having an internal combustion engine, it is general to cover the internal combustion engine, which is the source of the noise, so-called engine part, with a material having a sound absorbing property. However, if a material having a sound absorbing property is used in a place close to the engine, the sound absorbing base material may be deteriorated by heat generated from the engine, and in this case, the commercial property is significantly deteriorated.
【０００３】このため、エンジンの近くで耐熱性を要求
される場所に使用される吸音材には、熱を反射する事に
よって断熱性を付与させるため、フィルム又は繊維、若
しくはその両方で積層補強されたアルミニウム箔（以下
「断熱表被材」という）を表面に積層して、２層構造と
した吸音材が使用されている。Therefore, a sound absorbing material used in a place near the engine where heat resistance is required is laminated and reinforced with a film or fiber or both in order to impart heat insulation by reflecting heat. A sound absorbing material having a two-layer structure is used in which aluminum foil (hereinafter referred to as "heat insulating surface material") is laminated on the surface.
【０００４】[0004]
【発明が解決しようとする課題】ところが、上記のよう
な断熱表被材を表面に積層した吸音材であると、断熱表
被材には通常通気性がないために、吸音材単体、あるい
は通気性のある不織布を表被材に用いた吸音材と比較し
て吸音効果が著しく低下してしまうという不具合が発生
する。このため、必要十分な断熱性を保持しつつ、吸音
効果の優れた断熱吸音材を開発することが本発明の課題
である。However, in the case of the sound absorbing material having the above-mentioned heat insulating covering material laminated on the surface, since the heat insulating covering material usually does not have air permeability, the sound absorbing material alone or the ventilation material is used. There is a problem that the sound absorbing effect is remarkably reduced as compared with the sound absorbing material using the non-woven fabric having the property of being used as the surface covering material. Therefore, it is an object of the present invention to develop a heat insulating and sound absorbing material having an excellent sound absorbing effect while maintaining a necessary and sufficient heat insulating property.
【０００５】[0005]
【課題を解決するための手段】かかる課題を解決せんと
して、本発明者らは鋭意研究の結果、多孔質吸音材であ
る吸音基材の表面に積層される、フィルム又は繊維若し
くはその両方で積層補強された断熱表被材にのみ、多数
の細かい穴を開けることにより、前記断熱表被材に通気
性を付与して、断熱吸音材の吸音効果を高めたものであ
る。しかして本発明の要旨は、As a solution to this problem, the inventors of the present invention have conducted intensive studies and as a result, have laminated a film or fiber or both of them on the surface of a sound absorbing base material which is a porous sound absorbing material. A large number of fine holes are formed only in the reinforced heat insulating surface covering material to impart air permeability to the heat insulating surface covering material, thereby enhancing the sound absorbing effect of the heat insulating sound absorbing material. Therefore, the gist of the present invention is
【０００６】フィルム又は繊維、若しくはその両方によ
り積層されたアルミニウム箔による断熱表被材と、吸音
基材が積層一体化された構造の吸音材において、断熱表
被材にのみ直径０．５〜４ｍｍの貫通孔が開孔率２〜５
０％において開いている事を特徴とする断熱吸音材に存
する。[0006] In a sound absorbing material having a structure in which a heat insulating surface covering material made of aluminum foil laminated with a film or fibers or both, and a sound absorbing base material are laminated and integrated, only the heat insulating surface covering material has a diameter of 0.5 to 4 mm. Through hole has a porosity of 2 to 5
It exists in an adiabatic sound absorbing material characterized by being open at 0%.
【０００７】本発明における断熱吸音材に使用する吸音
基材は、内燃機関のエンジン周辺に使用する吸音材とし
て使用可能な材料であれば問題無く使用できる。嵩高性
フェルト、各種樹脂フォーム材、ガラス繊維、鉱物質繊
維、カーボン繊維等の無機質繊維を一度解繊し、これに
フェノール樹脂等の熱硬化性樹脂を混合し、半硬化状態
に収縮させたグラスウール、ロックウール、カーボンウ
ールや、ニードル加工により同様の製品を得たものも例
示できる。吸音基材の面密度としては２００ｇ／ｍ2〜
２ｋｇ／ｍ2のものが好適に使用できる。The sound absorbing base material used for the heat insulating sound absorbing material in the present invention can be used without any problem as long as it can be used as a sound absorbing material used around the engine of an internal combustion engine. Glass wool obtained by once defibrating bulky felt, various resin foam materials, glass fibers, mineral fibers, inorganic fibers such as carbon fibers, and mixing it with a thermosetting resin such as phenol resin to shrink it into a semi-cured state. Examples include rock wool, carbon wool, and products obtained by needle processing. The surface density of the sound absorbing base material is 200 g / m 2 ~
Those of 2 kg / m 2 can be preferably used.
【０００８】断熱材として使用されるアルミニウム箔
は、単体では極めて脆弱であるためポリエステル、ポリ
プロピレン、エチレン−酢酸ビニル共重合体、塩化ビニ
ル等の熱可塑性樹脂のフィルムにより、又はガラスクロ
ス、ポリエステル、ポリプロピレン、エチレン−酢酸ビ
ニル共重合体、塩化ビニル等の繊維によって、若しくは
上記フィルムと上記繊維の両方によって積層され裏打ち
面を形成することによって補強されたものが使用され
る。The aluminum foil used as a heat insulating material is extremely fragile by itself, and thus is made of a film of a thermoplastic resin such as polyester, polypropylene, ethylene-vinyl acetate copolymer, vinyl chloride, or glass cloth, polyester, polypropylene. Those reinforced by fibers such as ethylene-vinyl acetate copolymer, vinyl chloride or by laminating both the film and the fibers to form a backing surface are used.
【０００９】断熱表被材に開けられる穴は、直径０．５
〜４ｍｍの貫通穴が適当である。直径０．５ｍｍ未満の
穴は貫通穴を開けるための加工が困難であり、４ｍｍを
超える直径であると開けられた穴から吸音基材が熱劣化
してしまう虞れがある。The hole formed in the insulating surface material has a diameter of 0.5.
A through hole of ~ 4 mm is suitable. A hole having a diameter of less than 0.5 mm is difficult to process for forming a through hole, and a hole having a diameter of more than 4 mm may cause thermal deterioration of the sound absorbing base material from the hole formed.
【００１０】断熱表被材に開けられる穴の面積は、穴の
直径と関連して決定され、開孔率２〜５０％の範囲であ
るのが適当である。開孔率２％未満で穴を開けた場合、
所望の吸音性向上が得られない虞れがあり、開孔率５０
％を超えて穴を開けた場合、耐熱性が低下する虞れがあ
る。The area of the holes formed in the heat insulating cover material is determined in relation to the diameter of the holes, and it is suitable that the open area ratio is in the range of 2 to 50%. If you open a hole with a porosity of less than 2%,
There is a possibility that the desired improvement in sound absorption may not be obtained, and the open area ratio is 50
If holes are drilled in excess of%, the heat resistance may decrease.
【００１１】断熱表被材への穴開けの具体的な方法とし
ては、一方向からの針による穿刺工法、いわゆるニード
ル加工と、凸型刃と凹型刃による貫通穴穿孔工法、いわ
ゆるパンチング加工が例示出来る。ニードル加工の場
合、断熱吸音材成形時に穴が塞がってしまう虞れがある
ため、より好ましくは貫通穴を形成させるパンチング加
工の適用が望ましい。As a concrete method for making a hole in the heat insulating surface material, there is a puncturing method with a needle from one direction, so-called needle processing, and a through-hole punching method with a convex blade and a concave blade, so-called punching processing. I can. In the case of needle processing, there is a risk that the holes may be closed when the heat insulating and sound absorbing material is formed, so it is more preferable to apply punching processing for forming through holes.
【００１２】自動車の断熱吸音材を例示して、本発明の
製造例を説明する。適当な大きさの無機質吸音基材を成
形型の下型上に載置し、この吸音基材と略同じ面積の穴
あき断熱表被材を吸音基材の上に重ねて載置する。上型
を降下させて加圧成形、若しくは必要に応じて加熱加圧
成形を行う。成形された断熱吸音材の周囲をトリム型に
よって裁断する。必要な成形型を用意していれば、成形
と同時にトリムする事も可能である。A manufacturing example of the present invention will be described by exemplifying a heat insulating and sound absorbing material for an automobile. An inorganic sound absorbing base material having an appropriate size is placed on the lower mold of the molding die, and a perforated heat insulating surface covering material having substantially the same area as the sound absorbing base material is placed on the sound absorbing base material in a stacked manner. The upper mold is lowered to perform pressure molding or, if necessary, heat pressure molding. The periphery of the formed heat insulating and sound absorbing material is cut by a trim mold. It is also possible to trim at the same time as molding if the necessary mold is prepared.
【００１３】本発明の断熱吸音材は、自動車や各種の建
設機械、船舶等のエンジン周囲の防音対策部品に適用で
きる他、エンジンの排気熱が通過する近傍の防音対策部
品や、特にエンジン関係ではなくても耐熱処理が必要な
防音材に使用できる。INDUSTRIAL APPLICABILITY The heat insulating sound absorbing material of the present invention can be applied to soundproofing parts around the engine of automobiles, various construction machines, ships, etc. It can be used as a soundproofing material that requires heat treatment without it.
【００１４】[0014]
【実施例】以下に実施例を挙げ本発明のより詳細な理解
に供する。当然のことながら本発明は以下の実施例のみ
に限定されるものではない。The following examples are provided to provide a more detailed understanding of the present invention. As a matter of course, the present invention is not limited only to the following examples.
【００１５】[0015]
【実施例１】アルミニウム箔にポリエステルフィルムを
介してガラスクロスによって補強された断熱表被材に、
パンチング加工によって直径１．５ｍｍの穴を、開孔率
２％にて開け、この穴開き耐熱表被材に密度約７００ｇ
／ｍ2、厚さ約２０ｍｍのグラスウールを積層して、加
圧成形を行い、平板状の断熱吸音材１を得た。Example 1 A heat insulating surface material reinforced by a glass cloth through a polyester film on an aluminum foil,
Holes with a diameter of 1.5 mm are punched by punching at a porosity of 2%, and the perforated heat resistant surface material has a density of about 700 g.
/ M 2 and glass wool having a thickness of about 20 mm were laminated and pressure-molded to obtain a plate-shaped heat insulating and sound absorbing material 1.
【００１６】[0016]
【実施例２】実施例１で使用した断熱表被材に、パンチ
ング加工によって直径１．５ｍｍの穴を、開孔率５０％
にて開け、この穴開き耐熱表被材に密度約７００ｇ／ｍ
2、厚さ約２０ｍｍのグラスウールを積層して、加圧成
形を行い、平板状の断熱吸音材２を得た。[Example 2] A hole having a diameter of 1.5 mm was punched in the heat insulating surface material used in Example 1 to obtain a hole area ratio of 50%.
The perforated heat resistant surface material has a density of about 700 g / m
2. Glass wool having a thickness of about 20 mm was laminated and pressure-molded to obtain a plate-shaped heat insulating and sound absorbing material 2.
【００１７】[0017]
【比較例１】実施例１で使用した断熱表被材に、パンチ
ング加工によって直径１．５ｍｍの穴を、開孔率１％に
て開け、この穴開き耐熱表被材に密度約７００ｇ／
ｍ2、厚さ約２０ｍｍのグラスウールを積層して、加圧
成形を行い、平板状の断熱吸音材３を得た。[Comparative Example 1] A hole having a diameter of 1.5 mm was punched in the heat insulating surface covering material used in Example 1 at a porosity of 1%, and the perforated heat resistant surface covering material had a density of about 700 g /
Glass wool having a thickness of m 2 and a thickness of about 20 mm was laminated and pressure-molded to obtain a plate-shaped heat insulating and sound absorbing material 3.
【００１８】[0018]
【比較例２】実施例１で使用した断熱表被材に、パンチ
ング加工によって直径１．５ｍｍの穴を、開孔率６０％
にて開け、この穴開き耐熱表被材に密度約７００ｇ／ｍ
2、厚さ約２０ｍｍのグラスウールを積層して、加圧成
形を行い、平板状の断熱吸音材４を得た。[Comparative Example 2] A hole having a diameter of 1.5 mm was punched in the heat insulating surface material used in Example 1 to obtain a hole area ratio of 60%.
The perforated heat resistant surface material has a density of about 700 g / m
2. Glass wool having a thickness of about 20 mm was laminated and pressure-molded to obtain a plate-shaped heat insulating and sound absorbing material 4.
【００１９】[0019]
（１）吸音率測定 ＪＩＳ Ａ１４０９により規定される「残響室吸音率」
により、断熱吸音材１〜断熱吸音材４の吸音率を測定し
た。小型残響室所定箇所に測定する断熱吸音材を設置
し、ラウドスピーカーによって特定周波数の音を発生さ
せ、マイクロホンによってその音を記録し、５００Ｈｚ
〜８０００Ｈｚの周波数の音に対する吸音率を測定し
た。 吸音率は以下の式により求められる。 α＝５５．３Ｖ／ＣＳ（１／Ｔ1−１／Ｔ2） ここで、 α：吸音率 Ｔ1：試料を入れた残響時間（Ｓ） Ｔ2：空室時の残響時間（Ｓ） Ｖ：残響室の容積（ｍ3） Ｓ：試料面積（ｍ2） Ｃ：空気中の音速（ｍ／Ｓ） である。 （２）断熱性測定 床面と直角に置かれた発熱面を有する、１辺が２００ｍ
ｍの正方形の面状発熱ヒーターを２５０℃に加熱させて
おき、この発熱面から２００ｍｍの距離に、発熱面と平
行に、１辺が２００ｍｍの正方形の断熱吸音材１〜４を
断熱面を発熱面と向き合わせる様に置き、断熱面の裏側
中央部に温度センサーを取り付けて、加熱時間経過とと
もに温度の測定を行った。(1) Sound absorption coefficient measurement "Reverberation room sound absorption coefficient" specified by JIS A1409
Thus, the sound absorption coefficients of the heat insulating and sound absorbing materials 1 to 4 were measured. A sound insulation and sound absorbing material to be measured is installed in a predetermined place in a small reverberation room, a sound of a specific frequency is generated by a loudspeaker, and the sound is recorded by a microphone.
The sound absorption coefficient for the sound having a frequency of up to 8000 Hz was measured. The sound absorption coefficient is calculated by the following formula. α = 55.3V / CS (1 / T 1 −1 / T 2 ), where α: sound absorption coefficient T 1 : reverberation time with sample (S) T 2 : vacant reverberation time (S) V : Reverberation room volume (m 3 ) S: Sample area (m 2 ) C: Sound velocity in air (m / S). (2) Heat insulation measurement One side is 200m with a heating surface placed at right angles to the floor surface
A square planar heater of m is heated to 250 ° C., and the heat insulating surfaces 1 to 4 are arranged parallel to the heat generating surface at a distance of 200 mm from the heat insulating sound absorbing materials 1 to 4 each having a side of 200 mm. It was placed so as to face the surface, and a temperature sensor was attached to the central portion on the back side of the heat insulating surface, and the temperature was measured with the lapse of heating time.
【００２０】[0020]
【結果】結果を、図１及び図２に示す。図１は、縦軸に
吸音率（α）、横軸に周波数（Ｈｚ）を取ったグラフで
ある。図２は加熱時間（分）に対する測定温度（℃）を
取ったグラフである。Results: The results are shown in FIGS. 1 and 2. FIG. 1 is a graph in which the vertical axis represents sound absorption coefficient (α) and the horizontal axis represents frequency (Hz). FIG. 2 is a graph showing the measured temperature (° C.) with respect to the heating time (min).
【００２１】[0021]
【発明の効果】本発明になる断熱吸音材は、従来の吸音
材と比較して全周波数帯域において優れた吸音性を示
し、特に１０００Ｈｚ以上の周波数帯域において著しく
向上した吸音性を示した。また同時に断熱性は従来の吸
音材と何ら劣ること無く、実用性において問題がない。
よって従来の断熱吸音材が使用されていた箇所に全面的
に使用する事が可能であり、その場合には劇的に防音性
を向上させる事が可能となる。INDUSTRIAL APPLICABILITY The heat-insulating sound absorbing material according to the present invention exhibits excellent sound absorbing properties in all frequency bands as compared with the conventional sound absorbing materials, and particularly exhibits significantly improved sound absorbing properties in the frequency band of 1000 Hz or higher. At the same time, the heat insulating property is not inferior to the conventional sound absorbing material, and there is no problem in practicality.
Therefore, it is possible to use the heat insulating sound absorbing material in the entire place where the conventional heat insulating sound absorbing material is used, and in that case, it is possible to dramatically improve the soundproofing property.
【図１】実施例１〜比較例２による断熱吸音材１〜４の
吸音率を測定した結果を、縦軸に吸音率（α）、横軸に
周波数（Ｈｚ）を取った時のグラフとしてあらわしたも
のである。FIG. 1 is a graph in which the sound absorption coefficient (α) is plotted on the vertical axis and the frequency (Hz) is plotted on the horizontal axis, as a result of measuring the sound absorption coefficients of the heat insulating sound absorbing materials 1 to 4 according to Example 1 to Comparative Example 2. It is a representation.
【図２】実施例１〜比較例２による断熱吸音材１〜４の
断熱性を測定した結果を、縦軸に測定温度（℃）、横軸
に加熱時間（分）を取った時のグラフとしてあらわした
ものである。FIG. 2 is a graph in which the ordinate indicates the measurement temperature (° C.) and the abscissa indicates the heating time (min), with the results of measuring the heat insulating properties of the heat insulating and sound absorbing materials 1 to 4 according to Example 1 to Comparative Example 2. It is shown as.
Claims (1)
より積層されたアルミニウム箔による断熱表被材と、吸
音基材が積層一体化された構造の吸音材において、断熱
表被材にのみ直径０．５〜４ｍｍの貫通孔が開孔率２〜
５０％において開いている事を特徴とする断熱吸音材1. A sound-absorbing material having a structure in which a heat-insulating surface covering material made of aluminum foil laminated with a film or fibers, or both, and a sound-absorbing base material are laminated and integrated, and only the heat-insulating surface covering material has a diameter of 0.5. A through hole of ~ 4 mm has an opening ratio of 2
Adiabatic sound absorbing material characterized by being open at 50%
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18322795A JPH0913943A (en) | 1995-06-28 | 1995-06-28 | Heat insulating/sound absorbing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18322795A JPH0913943A (en) | 1995-06-28 | 1995-06-28 | Heat insulating/sound absorbing material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0913943A true JPH0913943A (en) | 1997-01-14 |
Family
ID=16132021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18322795A Withdrawn JPH0913943A (en) | 1995-06-28 | 1995-06-28 | Heat insulating/sound absorbing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0913943A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1186760A2 (en) | 2000-09-06 | 2002-03-13 | Nichias Corporation | Sound absorbing structure |
| US6720069B1 (en) | 1999-01-14 | 2004-04-13 | Nichias Corporation | Sound absorbing structure |
| EP1703215A1 (en) * | 2005-02-22 | 2006-09-20 | Franco Riello | Radiating aluminium panel for false ceilings |
| US8371419B2 (en) | 2008-04-22 | 2013-02-12 | 3M Innovative Properties Company | Hybrid sound absorbing sheet |
| US8573358B2 (en) | 2008-05-22 | 2013-11-05 | 3M Innovative Properties Company | Multilayer sound absorbing structure comprising mesh layer |
-
1995
- 1995-06-28 JP JP18322795A patent/JPH0913943A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6720069B1 (en) | 1999-01-14 | 2004-04-13 | Nichias Corporation | Sound absorbing structure |
| EP1020846A3 (en) * | 1999-01-14 | 2004-12-01 | Nichias Corporation | Sound absorbing structure |
| EP1186760A2 (en) | 2000-09-06 | 2002-03-13 | Nichias Corporation | Sound absorbing structure |
| US6601673B2 (en) | 2000-09-06 | 2003-08-05 | Nichias Corporation | Sound absorbing structure |
| EP1703215A1 (en) * | 2005-02-22 | 2006-09-20 | Franco Riello | Radiating aluminium panel for false ceilings |
| US8371419B2 (en) | 2008-04-22 | 2013-02-12 | 3M Innovative Properties Company | Hybrid sound absorbing sheet |
| US8573358B2 (en) | 2008-05-22 | 2013-11-05 | 3M Innovative Properties Company | Multilayer sound absorbing structure comprising mesh layer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020903 |