JPH11350363A - Nonwoven fabric sheet for acoustic material - Google Patents
Nonwoven fabric sheet for acoustic materialInfo
- Publication number
- JPH11350363A JPH11350363A JP15420598A JP15420598A JPH11350363A JP H11350363 A JPH11350363 A JP H11350363A JP 15420598 A JP15420598 A JP 15420598A JP 15420598 A JP15420598 A JP 15420598A JP H11350363 A JPH11350363 A JP H11350363A
- Authority
- JP
- Japan
- Prior art keywords
- nonwoven fabric
- sound absorbing
- fabric sheet
- binder resin
- absorbing material
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エンジンルーム、
フロアインシュレータなどに用いられる自動車用吸音材
に用いられる不織布シートに関するものである。The present invention relates to an engine room,
The present invention relates to a nonwoven fabric sheet used for an automobile sound absorbing material used for a floor insulator or the like.
【０００２】[0002]
【従来の技術】従来、自動車などに搭載されるエンジン
及び駆動系は、駆動時に騒音を発生する。そこで、この
騒音が乗員に不快感を与えることがないようにダッシュ
パネル、エンジンフード等に騒音対策として吸音材が付
設されている。現在、自動車用の吸音材としては、ガラ
スウールを用いたものが知られているが、繊維同士がば
らけることによる生産・運搬など取り扱い上の問題やリ
サイクルの点で問題となっている。2. Description of the Related Art Conventionally, an engine and a drive system mounted on an automobile or the like generate noise when driven. Therefore, a sound absorbing material is provided on a dash panel, an engine hood, or the like as a noise countermeasure so that the noise does not give an occupant a discomfort. At present, as a sound absorbing material for automobiles, a material using glass wool is known. However, there is a problem in handling such as production and transportation due to separation of fibers and a problem in recycling.
【０００３】これらの問題を解決するために、最近、ガ
ラスウールに変わって、天然繊維や合成繊維の不織布を
使った自動車用の吸音材が使用され始められており、そ
の構成繊維の繊度を細くするほど、吸音性能が優れるこ
とが知られており、最近では、ガラスウールに匹敵する
ほどの吸音性能を有する合成繊維不織布が開発されてい
る。In order to solve these problems, recently, instead of glass wool, sound absorbing materials for automobiles using a non-woven fabric of natural fibers or synthetic fibers have begun to be used, and the fineness of the constituent fibers has been reduced. It is known that the sound absorbing performance of a synthetic fiber nonwoven fabric has a sound absorbing performance comparable to that of glass wool.
【０００４】自動車用吸音材の要求特性として、吸音性
能の他に、特にエンジンルーム用など高温になる部位で
は、難燃性が重要視され、さらに水はね対策として撥水
性を有するものが望まれるようになってきた。さらに車
体への装着時に車体の形状どおりに成形できるように、
不織布自体の形状維持性と曲げや部分的圧縮などの型へ
の追従性の両立が必要であるが、構成繊維の繊度を細く
することにより、吸音性能と型への追従性は向上する
が、不織布自体の形状維持性は低下する問題があった。As a required characteristic of a sound absorbing material for automobiles, in addition to sound absorbing performance, flame retardancy is regarded as important especially in a high temperature region such as for an engine room, and a material having water repellency is desired as a countermeasure against water splashing. It has come to be. Furthermore, so that it can be molded according to the shape of the car body when mounted on the car body,
It is necessary to achieve both the shape retention of the nonwoven fabric itself and the ability to follow the mold such as bending and partial compression, but by reducing the fineness of the constituent fibers, the sound absorption performance and the ability to follow the mold are improved. There was a problem that the shape retention of the nonwoven fabric itself was reduced.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、かかる従来
技術の背景に鑑み、充分な難燃性、さらには撥水性を有
する上に、優れた吸音性を有する吸音材用不織布シート
を提供せんとするものである。SUMMARY OF THE INVENTION In view of the background of the prior art, the present invention does not provide a nonwoven fabric sheet for a sound absorbing material having sufficient flame retardancy, water repellency and excellent sound absorbing properties. It is assumed that.
【０００６】[0006]
【課題を解決するための手段】本発明は、かかる課題を
解決するために、次のような手段を採用する。すなわ
ち、本発明の吸音材用不織布シートは、厚さ５mm以上、
目付２００ｇ／ｍ2 以上である不織布において、該不織
布の少なくとも片面に、バインダー樹脂が不連続に付着
されており、かつ、該バインダー樹脂が難燃剤を含有す
ることを特徴とするものである。The present invention employs the following means in order to solve the above problems. That is, the nonwoven fabric sheet for sound absorbing material of the present invention has a thickness of 5 mm or more,
In a nonwoven fabric having a basis weight of 200 g / m 2 or more, a binder resin is discontinuously adhered to at least one surface of the nonwoven fabric, and the binder resin contains a flame retardant.
【０００７】[0007]
【発明の実施の形態】本発明は、前記課題、つまり難燃
性、撥水性を有する上に、優れた吸音性を有する吸音材
用不織布シートについて、鋭意検討し、特定な厚さ、目
付を有する不織布に、バインダー樹脂を不連続に付着さ
せ、かつ、該バインダー樹脂に難燃剤を含有させたとこ
ろ、かかる課題を一挙に解決することを究明したもので
ある。本発明の吸音材用不織布シートは、充分な吸音効
果を得るため、厚さは５mm以上、目付は２００ｇ／ｍ2
以上であることが必要である。BEST MODE FOR CARRYING OUT THE INVENTION The present invention has been made to thoroughly study the above-mentioned problems, that is, a nonwoven fabric sheet for a sound absorbing material having excellent flame absorbing properties, water repellency and excellent sound absorbing properties. It has been found that when a binder resin is discontinuously adhered to a nonwoven fabric and a flame retardant is contained in the binder resin, such a problem can be solved at once. The nonwoven fabric sheet for a sound absorbing material of the present invention has a thickness of 5 mm or more and a basis weight of 200 g / m 2 in order to obtain a sufficient sound absorbing effect.
It is necessary to be above.
【０００８】本発明のバインダー樹脂は、難燃剤を含有
し、かつ、不連続な状態で不織布の表面に付着させるこ
とが必要である。しかし、かかるバインダー樹脂を不織
布全体に付着させると、不織布全体の剛性が上がるため
形状維持性は向上するが、型への追従性は低下するので
好ましくない。かかるバインダー樹脂の付着量は、表面
１ｍ2 あたり、好ましくは１０〜１００ｇであるものが
よい。１０ｇより少ない時は不織布自体の形状維持性が
不十分であり、１００ｇより多いと不織布の剛性が大き
くなり過ぎて型への追従性が低下する。It is necessary that the binder resin of the present invention contains a flame retardant and adheres to the surface of the nonwoven fabric in a discontinuous state. However, when such a binder resin is adhered to the entire nonwoven fabric, the rigidity of the entire nonwoven fabric is increased, so that the shape maintaining property is improved, but the followability to the mold is deteriorated. The amount of the binder resin adhered is preferably 10 to 100 g per 1 m 2 on the surface. When the amount is less than 10 g, the shape retention of the nonwoven fabric itself is insufficient, and when the amount is more than 100 g, the rigidity of the nonwoven fabric becomes too large and the followability to the mold is reduced.
【０００９】自動車用吸音材は、吸音性能の他に取り付
け部位によつては、特にエンジンルーム、フロアインシ
ュレータなどにおいては、前者では難燃性の機能が必要
となるし、後者では撥水性の機能があるのが好ましい。
さらに、意匠性から表面が着色されている方がよい場合
もある。したがって、本発明のバインダー樹脂には、難
燃剤がふくまれていることが必須であり、さらに必要に
応じて、好ましくは撥水剤および顔料から選ばれた少な
くとも１種を含んだバインダー樹脂を用いるのがよい。[0009] In addition to the sound absorbing performance, the sound absorbing material for automobiles requires a flame-retardant function in the former, especially in an engine room or a floor insulator, and a water-repellent function in the latter, particularly in an engine room or a floor insulator. Preferably, there is.
In some cases, it is better to color the surface from the viewpoint of design. Therefore, it is essential that the binder resin of the present invention contains a flame retardant, and if necessary, a binder resin containing at least one selected from a water repellent and a pigment is preferably used. Is good.
【００１０】かかるバインダー樹脂は、後述する不織布
を構成する繊維、好ましくはポリエステル系繊維との接
着性、さらには顔料との親和性からアクリル系エマルジ
ョンあるいは水分散型ウレタン樹脂が好ましく使用され
る。かかるバインダー樹脂は、不連続に付着させるのが
重要で、それによって吸音効果に優れた空隙を維持させ
るのである。かかる不連続バインダー樹脂層は、スプレ
ーのような噴射方式の塗布手段によって好ましく達成す
ることができる。すなわち、かかるバインダー樹脂を不
織布表面に、スプレー法により塗布し、１７０℃以上の
温度で処理するのである。塗布手段として、樹脂溶液中
に不織布を浸責した後マングルなどで絞る方法でもよい
が、不織布が厚くて高目付であるので、乾燥、熱処理に
長時間を要する問題がある。As the binder resin, an acrylic emulsion or a water-dispersible urethane resin is preferably used from the viewpoint of adhesiveness with fibers constituting a non-woven fabric described later, preferably with polyester fibers, and further with affinity for pigments. It is important that such a binder resin be adhered discontinuously, thereby maintaining a void having an excellent sound absorbing effect. Such a discontinuous binder resin layer can be preferably achieved by a spray-type coating means such as a spray. That is, such a binder resin is applied to the surface of the nonwoven fabric by a spray method, and treated at a temperature of 170 ° C. or more. As a coating means, a method in which the nonwoven fabric is immersed in a resin solution and then squeezed with a mangle or the like may be used. However, since the nonwoven fabric is thick and high in weight, drying and heat treatment require a long time.
【００１１】本発明で使用される難燃剤は、別に特定さ
れないが、燐系の難燃化合物が好ましく、さらに好まし
くは脂肪族環式ホスホン酸エステルが好ましい。特に次
式で示される脂肪族環式ホスホン酸エステルが好ましく
使用される。The flame retardant used in the present invention is not particularly specified, but a phosphorus-based flame retardant compound is preferred, and an aliphatic cyclic phosphonate is more preferred. Particularly, an aliphatic cyclic phosphonic acid ester represented by the following formula is preferably used.
【００１２】[0012]
【化１】 かかる難燃剤は、好ましくは２重量％以上、さらに好ま
しくは３重量％以上該バインダー樹脂中に含有させる。Embedded image Such a flame retardant is preferably contained in the binder resin in an amount of at least 2% by weight, more preferably at least 3% by weight.
【００１３】本発明のバインダー樹脂には、撥水剤を含
有させることができ、かかる撥水剤としては、フッ素系
撥水剤あるいはシリコン系撥水剤を使用することができ
る。かかるフッ素系撥水剤としては、一般に撥水撥油油
剤として使用されているフッ素系化合物を使用すること
ができるが、たとえば、ポリペンタデカフルオロオクチ
ルアクリレート、ポリトリフルオロエチルアクリレー
ト、テトラフルオロエチレン−ヘキサフルオロプロピレ
ンなどを使用することができる。また、シリコン系撥水
剤としては、たとえば、ジメチルポリシロキサン、およ
びその待ったんあるいは側鎖に水酸基、アミノ基、エポ
キシ基、ポリエーテル基などを導入した変性ジメチルポ
リシロキサンなどを使用することができる。かかる撥水
剤は、混用することもできる。かかる撥水剤は、難燃剤
と同量以上の割合で含有させることができる。The binder resin of the present invention can contain a water repellent, and as such a water repellent, a fluorine water repellent or a silicon water repellent can be used. As such a fluorine-based water repellent, a fluorine-based compound generally used as a water- and oil-repellent oil agent can be used. For example, polypentadecafluorooctyl acrylate, polytrifluoroethyl acrylate, tetrafluoroethylene- Hexafluoropropylene and the like can be used. Further, as the silicon-based water repellent, for example, dimethylpolysiloxane, and modified dimethylpolysiloxane in which a hydroxyl group, an amino group, an epoxy group, a polyether group, or the like is introduced into a side chain or a side chain thereof can be used. . Such water repellents can be mixed. Such a water repellent can be contained in the same amount or more as the flame retardant.
【００１４】かかる該燐系化合物と該撥水剤は、バイン
ダー樹脂に含有されて使用されるものであり、バインダ
ー樹脂混合液として使用する場合は、該燐系化合物は１
０〜５０ｇ／ｌ、該撥水剤は２０〜５０ｇ／ｌ程度の液
濃度とし、好ましくはスプレー噴射させて付与すること
が好ましい。The phosphorus compound and the water repellent are used by being contained in a binder resin, and when used as a binder resin mixed solution, the phosphorus compound is 1
It is preferable that the water repellent has a liquid concentration of about 20 to 50 g / l, and is preferably applied by spraying.
【００１５】本発明の不織布は、平均繊度６ｄ以下であ
る繊維で構成されていることが望ましい。６ｄを越える
と、吸音材として最も重要な吸音性能において特に低周
波領域の性能が悪くなる。かかる繊維の素材は特に限定
されることなく、天然繊維や合成繊維などあらゆるもの
を用いることができるが、耐熱性やリサイクル性に優
れ、さらに比較的安価なポリエステル系繊維が特に好ま
しく使用される。また、かかる不織布としては、融点の
異なる２種以上の繊維、たとえば、少なくとも２０℃以
上融点の異なる繊維であって、かつ、融点の低い方の繊
維が全構成繊維の１０〜９０重量％である構成のものが
好ましく使用される。この場合、融点差が２０℃未満で
あると、吸音材成形時の高温圧着過程において、接着温
度が融点の高い繊維の融点と近すぎるため、不織布全体
が軟化または融解するおそれがあり、多孔構造が崩れ充
分な吸音性能が得られない。[0015] The nonwoven fabric of the present invention is desirably composed of fibers having an average fineness of 6d or less. If it exceeds 6d, the performance of the most important sound absorbing material as a sound absorbing material, particularly in the low frequency region, is deteriorated. The material of the fiber is not particularly limited, and any material such as a natural fiber and a synthetic fiber can be used. However, a polyester fiber excellent in heat resistance and recyclability and relatively inexpensive is particularly preferably used. Further, as such a nonwoven fabric, two or more kinds of fibers having different melting points, for example, fibers having different melting points of at least 20 ° C., and the lower melting point fiber is 10 to 90% by weight of all constituent fibers. Those having the configuration are preferably used. In this case, if the difference in melting point is less than 20 ° C., the bonding temperature is too close to the melting point of the fiber having a high melting point in the high-temperature pressing process during molding of the sound absorbing material, so that the entire nonwoven fabric may be softened or melted. And the sound absorption performance is not sufficient.
【００１６】また、融点の低い繊維は、全構成繊維の１
０重量％未満であると、繊維同士の接着力不足により形
状を維持できず、９０重量％を越えると、加工時に繊維
多孔質体が硬化し充分な吸音性能が得られない。Further, the fiber having a low melting point is one of the constituent fibers.
If the amount is less than 0% by weight, the shape cannot be maintained due to insufficient adhesive force between the fibers. If the amount exceeds 90% by weight, the fiber porous body is hardened at the time of processing and sufficient sound absorbing performance cannot be obtained.
【００１７】吸音率は、人間の可聴周波数帯域で高くす
る（１００％）ことが好ましいが、後記の方法で測定す
る可聴周波数の中で低音の代表値として５００ヘルツの
吸音率を３０％以上、高音の代表値として１０００ヘル
ツの吸音率を７０％以上とするのが好ましい。５００ヘ
ルツでの吸音率が３０％未満では低音の吸音性が低く充
分な低音の吸音効果が得られにくい傾向にあり、１００
０ヘルツでの吸音率が７０％未満では高音の吸音効果が
得られにくい傾向がある。The sound absorption coefficient is preferably increased (100%) in the human audible frequency band. However, among the audible frequencies measured by the method described below, the sound absorption coefficient of 500 Hz as a representative value of the low frequency is 30% or more. It is preferable that the sound absorption coefficient at 1000 Hz is 70% or more as a representative value of the treble. If the sound absorption at 500 Hz is less than 30%, the sound absorption of low sound tends to be low, and a sufficient sound absorbing effect of low sound tends not to be obtained.
If the sound absorption coefficient at 0 Hz is less than 70%, it tends to be difficult to obtain a high sound absorption effect.
【００１８】[0018]
【実施例】以下実施例により本発明を具体的に説明する
が、本発明は何らこれに限定されるものではない。な
お、実施例及び比較例に示す性能値は次の方法で測定し
た。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. The performance values shown in Examples and Comparative Examples were measured by the following methods.
【００１９】（型保持性）１５cm角の試料（厚さＸ１）
を水平に置き試料中央に、重さ４ｋｇ、直径８．５cmの
鉄球を乗せる。１０分後に鉄球を取り去り３分経過後
に、試料中央の厚みＸ２を測定し、Ｘ２／Ｘ１を（％）
で示した。(Mold retention) 15 cm square sample (thickness X1)
Is placed horizontally, and an iron ball having a weight of 4 kg and a diameter of 8.5 cm is placed on the center of the sample. Ten minutes later, the iron ball was removed, and three minutes later, the thickness X2 at the center of the sample was measured, and X2 / X1 was calculated as (%).
Indicated by
【００２０】（成形追従性）平板上に１５cm角、厚さＹ
１の試料を置き、この上に３cm角の孔の開いた平板を乗
せる。次に上の孔の開いた平板を試料の厚さが基の厚さ
の１／２になるまでプレスをし、この時の孔の部分の厚
みＹ２を測定し、Ｙ２／Ｙ１を（％）で示した。(Molding followability) 15 cm square, thickness Y on flat plate
The sample No. 1 is placed, and a flat plate having a 3 cm square hole is placed on the sample. Next, the flat plate with the upper hole is pressed until the thickness of the sample becomes の of the base thickness, the thickness Y2 of the hole portion at this time is measured, and Y2 / Y1 is calculated as (%). Indicated by
【００２１】（難燃性）１５cm角、厚さ１０mmの試料
を、樹脂塗布面を上にして水平に固定し、一角から着火
し燃焼する時間（秒）を求めた。(Flame Retardancy) A 15 cm square, 10 mm thick sample was fixed horizontally with the resin-coated surface facing up, and the time (seconds) for igniting and burning from one corner was determined.
【００２２】（撥水性）１５cm角、厚さ１０mmの試料の
樹脂塗布面に１０ポイントの水滴を滴下し３時間後に残
っている水滴のポイント数を測定した。(Water repellency) Ten points of water droplets were dropped on the resin-coated surface of a 15 cm square, 10 mm thick sample, and the number of remaining water droplets was measured after 3 hours.
【００２３】（吸音性）ＪＩＳ Ａ １４９５ 垂直入
射吸音測定法（管内法）に準じて測定した。(Sound Absorbing Property) The sound absorbing property was measured according to the JIS A 1495 normal incidence sound absorbing measuring method (in-tube method).
【００２４】実施例１〜２、比較例１〜３ 繊度１ｄ、繊維長３８mmのポリエチレンテレフタレート
繊維８５重量％と、繊度４ｄ、繊維長５１mmのポリエチ
レンテレフタレート／ポリエチレンイソフタレート共重
合繊維１５重量％を混綿し、通常の短繊維不織布製造方
法により積層ウエッブを作成し、該ウエッブを圧縮させ
た状態で１４５℃、５分間の熱処理を行い、厚さ３０m
m、目付１０００ｇ／ｍ2 の不織布（Ｆ）を作成した。Examples 1-2, Comparative Examples 1-3 85% by weight of polyethylene terephthalate fiber having a fineness of 1d and a fiber length of 38 mm, and 15% by weight of a polyethylene terephthalate / polyethylene isophthalate copolymer fiber having a fineness of 4d and a fiber length of 51 mm. Then, a laminated web is prepared by a normal short fiber nonwoven fabric manufacturing method, and is heat-treated at 145 ° C. for 5 minutes in a state where the web is compressed to have a thickness of 30 m.
m, a nonwoven fabric (F) having a basis weight of 1000 g / m 2 was prepared.
【００２５】次に樹脂として、脂肪族環式ホスホン酸エ
ステル難燃剤、フッ素系撥水剤（アサヒガードＡＧ７１
０）、黒色顔料、水分散型ウレタン樹脂を、表１の配合
で調合した混合液を準備し、不織布の片面にスプレー塗
布した後１７５℃、５分間熱処理を行った。該不織布の
性能を評価した結果を表１に示す。Next, as the resin, an aliphatic cyclic phosphonate ester flame retardant, a fluorine-based water repellent (Asahigard AG71)
0), a mixed solution prepared by mixing a black pigment and a water-dispersible urethane resin with the composition shown in Table 1 was prepared, sprayed onto one surface of the nonwoven fabric, and then heat-treated at 175 ° C for 5 minutes. Table 1 shows the results of evaluating the performance of the nonwoven fabric.
【００２６】比較例として、実施例と同様にして作成し
た不織布（Ｆ）、また、不織布（Ｆ）に実施例で用いた
混合樹脂液をスプレー塗布したもの、さらには、実施例
の方法で作成した厚さ、目付の異なる不織布（Ｆ）に混
合樹脂液をスプレー塗布したものを評価した。As a comparative example, a non-woven fabric (F) prepared in the same manner as in the example, a non-woven fabric (F) spray-coated with the mixed resin solution used in the example, and a non-woven fabric (F) prepared by the method of the example A non-woven fabric (F) having a different thickness and basis weight was spray-coated with the mixed resin solution, and evaluated.
【００２７】[0027]
【表１】 表１から、実施例１〜２のものは、比較例１〜３のもの
に比して、優れた型保持性、成形追従性、難燃性、撥水
性、吸音性を、ともに兼ね備えた吸音材用として優れた
不織布シートであることを確認した。[Table 1] From Table 1, it is found that Examples 1-2 have better mold retention, molding followability, flame retardancy, water repellency and sound absorption than Comparative Examples 1-3. It was confirmed that it was an excellent nonwoven fabric sheet.
【００２８】[0028]
【発明の効果】本発明によれば、優れた型保持性、成形
追従性、難燃性、撥水性、吸音性を兼ね備えた吸音材用
不織布シートを提供することができる。According to the present invention, it is possible to provide a nonwoven fabric sheet for a sound absorbing material having excellent mold holding properties, molding followability, flame retardancy, water repellency and sound absorbing properties.
Claims (9)
ある不織布において、該不織布の少なくとも片面に、バ
インダー樹脂が不連続に付着されており、かつ、該バイ
ンダー樹脂が難燃剤を含有することを特徴とする吸音材
用不織布シート。1. A nonwoven fabric having a thickness of 5 mm or more and a basis weight of 200 g / m 2 or more, wherein a binder resin is discontinuously adhered to at least one surface of the nonwoven fabric, and the binder resin contains a flame retardant. A nonwoven fabric sheet for a sound absorbing material, characterized in that:
はこれらの混合した形で付着されているものである請求
項１記載の吸音材用不織布シート。2. The non-woven fabric sheet for a sound absorbing material according to claim 1, wherein said binder resin is adhered in the form of granules, aggregates or a mixture thereof.
０ｇ／ｍ2 である請求項１または２記載の吸音材用不織
布シート。3. The method according to claim 1, wherein the amount of the binder resin adhered is 10 to 10.
The nonwoven fabric sheet for a sound absorbing material according to claim 1, which has a weight of 0 g / m 2 .
うち少なくとも一つを含むものである請求項１〜３のい
ずれかに記載の吸音材用不織布シート。4. The nonwoven fabric sheet for a sound absorbing material according to claim 1, wherein said binder resin contains at least one of a water repellent and a pigment.
繊維を主体としてなるものである請求項１〜４のいずれ
かに記載の吸音材用不織布シート。5. The nonwoven fabric sheet for a sound absorbing material according to claim 1, wherein said nonwoven fabric is mainly composed of fibers having an average fineness of 6d or less.
項１〜５のいずれかに記載の吸音材用不織布シート。6. The nonwoven fabric sheet for a sound absorbing material according to claim 1, wherein said fibers are polyester fibers.
で構成されている請求項１〜６いずれかに記載の吸音材
用不織布シート。7. The nonwoven fabric sheet for a sound absorbing material according to claim 1, wherein said nonwoven fabric is composed of two or more fibers having different melting points.
とも２０℃以上融点の異なる繊維であって、かつ、融点
の低い方の繊維が全構成繊維の１０〜９０重量％である
請求項７記載の吸音材用不織布シート。8. The fiber according to claim 1, wherein the two or more kinds of fibers having different melting points are fibers having different melting points of at least 20 ° C., and the fiber having the lower melting point is 10 to 90% by weight of all constituent fibers. 8. The nonwoven fabric sheet for a sound absorbing material according to 7.
０ヘルツで３０％以上、１０００ヘルツで７０％以上で
ある請求項１〜９いずれかに記載の吸音材用不織布シー
ト。9. The non-woven fabric sheet for sound absorbing material has a sound absorption coefficient of 50.
The nonwoven fabric sheet for a sound absorbing material according to any one of claims 1 to 9, wherein the nonwoven fabric sheet has a content of 30% or more at 0 Hz and 70% or more at 1000 Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15420598A JPH11350363A (en) | 1998-06-03 | 1998-06-03 | Nonwoven fabric sheet for acoustic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15420598A JPH11350363A (en) | 1998-06-03 | 1998-06-03 | Nonwoven fabric sheet for acoustic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11350363A true JPH11350363A (en) | 1999-12-21 |
Family
ID=15579150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15420598A Pending JPH11350363A (en) | 1998-06-03 | 1998-06-03 | Nonwoven fabric sheet for acoustic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11350363A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012136803A (en) * | 2010-12-27 | 2012-07-19 | Nagoya Oil Chem Co Ltd | Cushioned sheet, acoustic material, filter and method for manufacturing the cushioned sheet |
| JP2013520581A (en) * | 2010-02-26 | 2013-06-06 | コーロン インダストリーズ インク | Artificial leather |
| US20140357730A1 (en) * | 2006-01-18 | 2014-12-04 | INVISTA North America S.à r.l. | Non-textile polymer compositions and methods |
-
1998
- 1998-06-03 JP JP15420598A patent/JPH11350363A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140357730A1 (en) * | 2006-01-18 | 2014-12-04 | INVISTA North America S.à r.l. | Non-textile polymer compositions and methods |
| JP2013520581A (en) * | 2010-02-26 | 2013-06-06 | コーロン インダストリーズ インク | Artificial leather |
| JP2012136803A (en) * | 2010-12-27 | 2012-07-19 | Nagoya Oil Chem Co Ltd | Cushioned sheet, acoustic material, filter and method for manufacturing the cushioned sheet |
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