JP5698024B2 - Damping structure - Google Patents
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- JP5698024B2 JP5698024B2 JP2011031094A JP2011031094A JP5698024B2 JP 5698024 B2 JP5698024 B2 JP 5698024B2 JP 2011031094 A JP2011031094 A JP 2011031094A JP 2011031094 A JP2011031094 A JP 2011031094A JP 5698024 B2 JP5698024 B2 JP 5698024B2
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- 238000013016 damping Methods 0.000 title claims description 75
- 239000010410 layer Substances 0.000 claims description 110
- 239000000463 material Substances 0.000 claims description 39
- 239000004745 nonwoven fabric Substances 0.000 claims description 29
- 239000000835 fiber Substances 0.000 claims description 22
- 239000000758 substrate Substances 0.000 claims description 19
- 229920000728 polyester Polymers 0.000 claims description 18
- 239000012943 hotmelt Substances 0.000 claims description 13
- 229920005549 butyl rubber Polymers 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 9
- 239000012790 adhesive layer Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 238000000748 compression moulding Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000007731 hot pressing Methods 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 2
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 239000012779 reinforcing material Substances 0.000 claims description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 13
- 238000005452 bending Methods 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003856 thermoforming Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Vibration Prevention Devices (AREA)
- Laminated Bodies (AREA)
Description
本発明は制振材料に関するものであり、さらに言えば、ポリエステル繊維系不織布の圧縮多孔質体にポリエステル繊維系スパンボンド不織布を拘束層とする複合した制振構造体に係るものである。 The present invention relates to a vibration damping material. More specifically, the present invention relates to a vibration damping structure in which a compressed porous body of a polyester fiber nonwoven fabric is combined with a polyester fiber spunbond nonwoven fabric as a constraining layer.
自動車、車両、家電製品、電子機器、住宅機器、産業機器などで比較的薄板鋼板など金属板や樹脂板などで構成されている場合に、機械的な振動が伝搬してきて、それらの薄板を共振させて固体伝搬音を発生させることがあり、これが原因で騒音問題や品質問題を引き起こすことがあった。 When automobiles, vehicles, home appliances, electronic equipment, housing equipment, industrial equipment, etc. are composed of relatively thin steel plates such as metal plates and resin plates, mechanical vibrations propagate and resonate with those thin plates. In some cases, this may cause a solid-propagating sound, which may cause noise problems and quality problems.
特に、衝撃を受ける場合、広帯域な周波数の振動で加振される場合、振動源の周波数が広帯域にわたり変化する場合、などで生じるこれらの問題を解決するために、薄板にシート状の制振材料を貼り付けることで、板の共振を抑制し、固体伝搬を低減する方法がよく取られる。 In particular, in order to solve these problems that occur when shock is applied, vibration is applied with a broadband frequency, the frequency of the vibration source is changed over a wide band, etc., a sheet-like damping material on a thin plate By sticking, the method of suppressing the resonance of the plate and reducing the solid propagation is often taken.
この場合、使用される制振材料として、工業的に最も一般的な材料に高分子系制振材料（非拘束タイプ）がある。そして、この高分子材料としては、ゴム系、ゴムアスファルト系、塩ビ系などが用いられ、充填材としてマイカ、鉄粉などを混合し、これをシート状にし、基板に当接するために粘着処理されたタイプが多い。 In this case, as a vibration damping material to be used, there is a polymer type vibration damping material (unconstrained type) as the most common material in the industry. And as this polymer material, rubber-based, rubber asphalt-based, vinyl chloride-based, etc. are used, mica, iron powder, etc. are mixed as a filler, made into a sheet, and subjected to adhesion treatment to make contact with the substrate There are many types.
この高分子系制振材料は、基板の屈曲振動に対して制振材料（制振層）がのび変形することで、振動エネルギーが熱エネルギーとして消費され、共振が抑制され、その結果、固体伝搬音が低減されるという技術思想からなっている。 In this polymer damping material, the vibration damping material (damping layer) is deformed and deformed in response to the bending vibration of the substrate, so that the vibration energy is consumed as thermal energy and the resonance is suppressed. It consists of the technical idea that sound is reduced.
しかるに、この種の制振材料では、固体伝搬音を１０ｄＢ程度低減しようとする場合、基板の厚さに対して約２倍の厚さの制振材料を貼るのが普通であり、例えば、０．８の普通鋼板に対しては約２ｍｍ厚さの制振材料を用いることになり、重量的には約３．６ｋｇ／ｍ２の増加となる。また、一般的に充填材を混合しシート状にし、さらに粘着処理を施すためにコスト的にも高くなるといわれている。 However, in this type of damping material, when the solid-borne sound is to be reduced by about 10 dB, it is common to apply a damping material having a thickness about twice the thickness of the substrate. For a normal steel plate of .8, a damping material having a thickness of about 2 mm is used, and the weight increases by about 3.6 kg / m 2 . Further, it is generally said that the cost is increased because a filler is mixed to form a sheet and further subjected to an adhesion treatment.
このように、従来の制振材は充填材などを多量に充填するために剛性が大きくなり、基板の薄板の剛性を大幅に高めてしまう。このため、共振の抑制はするものの、逆に音響放射効率がよくなり、固体伝搬音の低減に対してはマイナス要因として働くという欠点を有する。また、曲面部など異形部への適用は難しいことが多い。特に、従来の制振材（高分子系）の拘束タイプは更にこの傾向が強い。 Thus, since the conventional damping material is filled with a large amount of filler and the like, the rigidity is increased, and the rigidity of the thin plate of the substrate is greatly increased. For this reason, although the resonance is suppressed, the acoustic radiation efficiency is improved, and there is a disadvantage that it acts as a negative factor for the reduction of the solid propagation sound. Moreover, it is often difficult to apply to a deformed portion such as a curved surface portion. In particular, the conventional vibration damping material (polymer type) restraint type is more prone to this tendency.
本発明は、上記したような従来タイプの高分子系制振材料より軽量化を図ると同時に、制振性能を向上し、コストの低減が図れる構造の制振材料を創出することを目的とするものである。 It is an object of the present invention to create a vibration damping material having a structure capable of reducing the cost while reducing the weight as compared with the conventional type polymer damping material as described above. Is.
本発明の第１の要旨は、第一層として被制振基板に対して粘着機能を付与する粘着層、第二層として厚さ１５〜４０ｍｍ、かさ密度１５〜５０ｋｇ／ｍ ３ のポリエステル繊維系不織布を熱プレスで１〜３ｍｍ程度に圧縮成型した圧縮多孔質体層、第三層として前記圧縮多孔質体層を拘束するポリエステル繊維系スパンボンド不織布の表皮層、の三層を複合一体化したことを特徴とする制振構造体に係るものである。 The first gist of the present invention is an adhesive layer that imparts an adhesive function to the vibration- damped substrate as the first layer, and a polyester fiber system having a thickness of 15 to 40 mm and a bulk density of 15 to 50 kg / m 3 as the second layer. Three layers of a compressed porous body layer formed by compressing a nonwoven fabric to about 1 to 3 mm by hot pressing, and a skin layer of a polyester fiber-based spunbond nonwoven fabric that constrains the compressed porous body layer as a third layer are combined and integrated. The present invention relates to a vibration damping structure characterized by that.
特に第二層について言えば、厚さ１５〜４０ｍｍ、かさ密度１５〜５０ｋｇ／ｍ３のポリエステル繊維系母材を熱プレスで１〜３ｍｍ程度に圧縮成型した多孔質体層であり、第三層との間の一体化には、好ましくはホットメルト材料で熱圧縮成型するものである。尚、この母材の繊維配向は、縦配向、横配向、ランダム配向のいずれでも良いが、好ましくは、縦配向のものがよい。 In particular, the second layer is a porous layer obtained by compression molding a polyester fiber base material having a thickness of 15 to 40 mm and a bulk density of 15 to 50 kg / m 3 to about 1 to 3 mm by hot pressing, and the third layer. For the integration between the two, it is preferable to perform hot compression molding with a hot melt material. The fiber orientation of this base material may be any of longitudinal orientation, lateral orientation, and random orientation, but preferably it is longitudinal orientation.
本発明の第２の要旨は、本発明の第１の要旨の制振構造体の製法であって、三層構造の複合一体化にあって、第二層と第三層はその間にホットメルト材料を介在させて熱圧縮成型して一体化し、次いで第二層側に第一層の粘着処理を行って複合一体化したことを特徴とする制振構造体の製法に係るものである A second gist of the present invention is a method for manufacturing a vibration damping structure according to the first gist of the present invention, wherein the second layer and the third layer are hot-melted between them. The present invention relates to a method of manufacturing a vibration damping structure characterized in that a material is interposed and integrated by heat compression molding, and then the first layer is subjected to adhesive treatment on the second layer side and combined and integrated.
本発明の第１の基本構造として、後述する図１のような構成をとることで優れた特徴を創出することができたものである。即ち、制振性能の向上、軽量化、コスト低減を図ることができることとなったものであり、例えば、基板の曲げ変形時に圧縮多孔質体の繊維間のフリクション及び未加硫ブチルゴムの制振層におけるずれせん断変形による相乗効果により振動エネルギーの熱エネルギーへの変換効率を高めることができ、熱成形が可能であるので曲面部はもとより、ある程度の凸部、凹部にも対応できる制振構造体が得られたものである。 As the first basic structure of the present invention, an excellent feature can be created by taking the configuration as shown in FIG. 1 described later. That is, the vibration damping performance can be improved, the weight can be reduced, and the cost can be reduced. For example, the friction between the fibers of the compressed porous body and the vibration damping layer of unvulcanized butyl rubber at the time of bending deformation of the substrate Because of the synergistic effect due to shear shear deformation, the conversion efficiency of vibration energy into heat energy can be increased, and thermoforming is possible, so there is a damping structure that can handle not only curved parts but also some convex parts and concave parts. It is obtained.
以下、本発明の第１の制振構造体を中心に述べるが、用いる母材及び表皮材のポリエステル繊維は、他の材料に比べて優れた制振性能を有しており、かつ、環境に優しい材料で、耐候性・耐久性に優れ・長期の使用に最適であること、リサイクル性が確立されており地球環境に優しいこと、など多くの特徴を有している。本発明はかかる特徴を持つポリエステル繊維を主体とした制振構造体を提供するものである。 Hereinafter, the first damping structure of the present invention will be mainly described, but the base material and the polyester fiber of the skin material used have superior damping performance compared to other materials, and are environmentally friendly. It is a gentle material with excellent weather resistance, durability, optimal for long-term use, recyclability has been established, and it has many features such as being friendly to the global environment. The present invention provides a vibration damping structure mainly composed of polyester fibers having such characteristics.
本発明の制振構造体の第一層は、被制振基板に対して粘着機能を付与する粘着層・・制振層である。かかる粘着層は、未加硫ブチルゴム系、天然ゴム系、アクリル系、ウレタンゲル系、スチレンゲル系などの高分子系粘着材層が好んで用いられ、場合によっては、内部に補強材としての布を内包することも可能である。勿論、被制振基板に施工する前は、第一層面に離型紙が設けられているのが良い。基板への接着を兼ねて、制振層に未加硫ブチルゴムなどの粘着材を配することで制振性能の向上と共にコスト低減を図ったものである。 The first layer of the vibration damping structure of the present invention is an adhesive layer that provides an adhesive function to the vibration-damped substrate. Such an adhesive layer is preferably an unvulcanized butyl rubber-based, natural rubber-based, acrylic-based, urethane gel-based, or styrene gel-based adhesive layer, and in some cases, a cloth as a reinforcing material may be used inside. Can also be included. Of course, it is preferable that a release paper is provided on the first layer surface before construction on the vibration-damped substrate. The adhesive material such as unvulcanized butyl rubber is disposed on the vibration damping layer for adhesion to the substrate, thereby improving the vibration damping performance and reducing the cost.
本発明の第二層は、母材はポリエステル系の繊維を原料とするものであり、当初は、厚さ１５〜４０ｍｍ、かさ密度１５〜５０ｋｇ／ｍ３のポリエステル繊維系母材を熱プレスで１〜３ｍｍ程度に圧縮成型した多孔質体層であり、第三層との間の一体化には、好ましくはホットメルト材料を挟んで熱圧縮成型するものである。尚、場合によっては、この母材中にホットメルト材料を混在させておきこれを利用することも可能である。ホットメルト材料は、比較的低温で溶融するシート材料或いはパウダーである。尚、この母材の繊維配向は、縦配向、横配向、ランダム配向のいずれでも良いが、圧縮強度の面、或いは被制振基板に対する追従の面から、好ましくは縦配向のものがよい。尚、第二層の熱圧縮、これと第三層との間の融着一体化に用いられるホットメルト材は５〜１００ｇ／ｍ２程度、好ましくは２０〜４０ｇ／ｍ２が用いられる。 In the second layer of the present invention, the base material is made of polyester fiber as a raw material. Initially, a polyester fiber base material having a thickness of 15 to 40 mm and a bulk density of 15 to 50 kg / m 3 is obtained by hot pressing. It is a porous body layer compression-molded to about 1 to 3 mm. For integration with the third layer, it is preferably hot-compression molded with a hot-melt material interposed therebetween. In some cases, it is possible to use a hot melt material mixed in the base material. A hot melt material is a sheet material or powder that melts at a relatively low temperature. The fiber orientation of the base material may be any of longitudinal orientation, lateral orientation, and random orientation, but is preferably longitudinally oriented from the viewpoint of compressive strength or following of the vibration-damped substrate. The thermal compression of the second layer, which fused with the hot-melt material used in integrated the 5 to 100 g / m 2 approximately between the third layer, preferably 20 to 40 g / m 2 is used.
本発明の第三層は、ポリエステル繊維系不織布であり、スパンボンド法によって得られたものである。スパンボンドとは溶融押出成型により長繊維化・高密度化した不織布である。この第三層は、表皮層となるが、第二層を拘束する拘束層となるものでもある。尚、この第三層には、場合によっては、色彩や印刷を可能とするものが望ましい。 The third layer of the present invention is a polyester fiber non-woven fabric, and is obtained by a spunbond method. Spunbond is a non-woven fabric that has been long-fibered and densified by melt extrusion. This third layer serves as a skin layer, but also serves as a constraining layer that restrains the second layer. In some cases, the third layer may be capable of color and printing.
尚、第三層のスパンボンド不織布は一層だけでなく、二層以上になってもよく、ホットメルトシート或いはホットメルトパウダーで融着させることができる。第三層のスパンボンド不織布を二層以上とする場合には、最外層の不織布は耐候性があり、剛性の高いものが好んで用いられる。この場合、予め複数層としておくだけではなく、施工後に必要に応じて二層以上とし、制振効果を更にもたらすことも可能である。
このように、第三層のスパンボンド不織布を複数層とすることにより、より制振効果の優れた構造体が得られることとなったのである。第三層を複数層とする場合も前記と同程度の量のホットメルト材が使用可能である。
The third-layer spunbonded nonwoven fabric is not limited to a single layer but may be composed of two or more layers, and can be fused with a hot melt sheet or hot melt powder. When the third-layer spunbonded nonwoven fabric has two or more layers, the outermost nonwoven fabric is preferably weather resistant and highly rigid. In this case, it is possible not only to have a plurality of layers in advance, but also to provide two or more layers as necessary after the construction to further provide a vibration damping effect.
As described above, by forming the third-layer spunbonded nonwoven fabric into a plurality of layers, a structure having a more excellent vibration damping effect can be obtained. When the third layer has a plurality of layers, the same amount of hot melt material as above can be used.
本発明の最大の特徴は、第二層であるポリエステル繊維系不織布の圧縮多孔質体と、第三層であるポリエステル系のスパンボンド不織布の複合層により、基板の曲げ変形時の制振層にずり変形を生じせしめ、振動エネルギーを熱エネルギーとして消費する効率を高めたものである。そして、最も伸縮しにくいスパンボンド不織布を圧縮多孔質体を介して配することで、制振層によりずれせん断変形を生じる効果を高めたものである。 The greatest feature of the present invention is that it is a damping layer during bending deformation of the substrate by a composite layer of a compressed porous body of a polyester fiber nonwoven fabric as the second layer and a polyester spunbond nonwoven fabric as the third layer. The shear deformation is caused and the efficiency of consuming the vibration energy as heat energy is enhanced. And the effect which produces a shearing shear deformation | transformation by a damping layer is improved by arranging the spunbond nonwoven fabric which is hard to expand and contract through the compressed porous body.
本発明の制振構造体の構成は、第一層（粘着層・・制振層）＋第二層（圧縮不織布）＋第三層（スパンボンド不織布）であり、第三層は第二層の拘束層となっている。かかる拘束層がないと、曲げ振動（基板の屈曲振動）に対して、第一層（粘着層）が基板との接着面で引張られて自然に伸び変形を示すので、熱エネルギーへの変換量が少ない。このため、大きな制振効果を出すためには、基板に対して一般的には基板の厚さの２倍以上の制振層が必要になり、重量も大きくなる。これに対して、本発明のように拘束層を備えた構造になると、制振層にずり（ずれせん断変形を生じ、薄い制振層で効率よく熱エネルギーに変換され、なおかつ、本発明は、圧縮した不織布を介在させているために、圧縮された不織布自体でも繊維間のフリクションによる熱エネルギーの変換があり、振動エネルギーを熱エネルギーへの変換畳が大きくなり、軽量にもかかわらず、大きな制振効果が得られるのである。 The structure of the vibration damping structure of the present invention is the first layer (adhesive layer / damping layer) + second layer (compressed nonwoven fabric) + third layer (spunbond nonwoven fabric), and the third layer is the second layer. It is a constraining layer. Without such a constraining layer, the first layer (adhesive layer) is stretched spontaneously against the bending vibration (bending vibration of the substrate) and exhibits an elastic deformation. Less is. For this reason, in order to produce a great vibration damping effect, a vibration damping layer that is generally twice or more the thickness of the substrate is required for the substrate, and the weight also increases. In contrast, when the structure having a constraining layer as in the present invention, the vibration damping layer is sheared (deviation shear deformation occurs, and the thin vibration damping layer is efficiently converted into thermal energy. Because the compressed non-woven fabric is interposed, the compressed non-woven fabric itself has thermal energy conversion due to the friction between the fibers, and the tatami to convert vibration energy into thermal energy becomes large. A vibration effect is obtained.
本発明の制振構造体の複合一体化にあって、１５〜４０ｍｍの厚さの第二層と第三層とはその間にホットメルト材料を介在させて熱圧縮成型して１〜３ｍｍの厚さに一体化し、次いで第二層側に第一層の粘着処理を行って複合一体化（離型紙付）するのが好ましい製法である。 In the composite integration of the vibration damping structure of the present invention, the second layer and the third layer having a thickness of 15 to 40 mm are formed by hot compression molding with a hot melt material interposed therebetween, and a thickness of 1 to 3 mm. It is a preferable production method that is integrated with the first layer and then subjected to the first layer adhesion treatment on the second layer side to be combined and integrated (with release paper).
図１は、本発明の第１の制振構造体の第１例を示すものであり、第三層（３）としてポリエステル繊維系スパンボンド不織布、第二層（２）としてホットメルト材を混在させた縦配向のポリエステル繊維系不織布（厚さ２０ｍｍ、６００ｋｇ／ｍ２）を積層し、これを熱圧縮して、厚さ２ｍｍとした。これに第一層（１）として、厚さ０．５ｍｍの未加硫ブチルゴム層を添着させ、基板（１０）に貼り付けた。（４）は離型紙である。 FIG. 1 shows a first example of the first vibration damping structure of the present invention, in which a polyester fiber-based spunbond nonwoven fabric is mixed as the third layer (3), and a hot melt material is mixed as the second layer (2). A vertically oriented polyester fiber nonwoven fabric (thickness 20 mm, 600 kg / m 2 ) was laminated and thermally compressed to a thickness of 2 mm. To this, an unvulcanized butyl rubber layer having a thickness of 0.5 mm was attached as the first layer (1) and attached to the substrate (10). (4) is a release paper.
図２は、本発明の第１例の特徴を示すグラフであり、厚さ０．８ｍｍの基板に種々の制振構造体を添着した際の音圧レベルを示したものである。
即ち、図中、Ａは、上記した本発明の第１例の制振構造体の場合、Ｂは制振構造体を用いない場合、Ｃは０．５ｍｍの未加硫ブチルゴムのみの場合、Ｄは厚さ２ｍｍの従来の高分子系制振構造体（ゴムアスファルト中にマイカを充填）の場合、Ｅは本発明の制振構造体のうち、第三層を省略した制振構造体の場合の夫々の音圧レベルである。
FIG. 2 is a graph showing the characteristics of the first example of the present invention, and shows the sound pressure level when various damping structures are attached to a substrate having a thickness of 0.8 mm.
That is, in the figure, A is the damping structure of the first example of the present invention described above, B is the case where the damping structure is not used, C is the case where only 0.5 mm of unvulcanized butyl rubber is used, D Is a conventional polymer damping structure having a thickness of 2 mm (filled mica in rubber asphalt), E is a damping structure in which the third layer is omitted from the damping structure of the present invention The sound pressure level of each.
本発明品ＡとＥとを比較すると、本発明品Ａは第二層の圧縮した不織布に加え、第三層として表面にスパンボンド不織布（拘束層）が存在することで、圧縮した不織布の伸びが抑えられ、制振層（未加硫ブチルゴム）にずり（ずれせん断変形）が起きやすくなるために、振動エネルギーが熱エネルギーヘの変換量が増え、大きな制振効果が得られることとなる。それに比べて、Ｅは本発明Ａのスパンボンド不織布（拘束層）がないために、圧縮された不織布が伸びやすくなるため、制振層（未加硫ブチルゴム）にずり（ずれせん断変形）が緩む方に行き、本発明Ａほどの制振効果得られない。拘束層である最表面のスパンボンド不織布の存在が大きいことを示している。
尚、従来の制振構造体の場合にあっては、基板（１０）に凹凸があった場合には、凹凸の程度によってはこれに追従することができないケースがあった。
Comparing the products A and E of the present invention, the product A of the present invention is not only the compressed nonwoven fabric of the second layer, but also the presence of a spunbonded nonwoven fabric (constraint layer) on the surface as the third layer. Is suppressed, and shear (shear shear deformation) is likely to occur in the vibration damping layer (unvulcanized butyl rubber). Therefore, the amount of vibration energy converted into thermal energy increases, and a large vibration damping effect is obtained. On the other hand, since E does not have the spunbond nonwoven fabric (constraint layer) of the present invention A, the compressed nonwoven fabric tends to be stretched, so that the shear (slip shear deformation) is loosened in the damping layer (unvulcanized butyl rubber). The vibration control effect as in the present invention A is not obtained. It shows that the presence of the outermost spunbond nonwoven fabric as the constraining layer is large.
In the case of the conventional vibration damping structure, in the case where the substrate (10) has irregularities, there are cases in which it cannot be followed depending on the degree of irregularities.
このグラフからも分かるように、本発明の制振構造体は、全ての周波数に対して極めて効果的であり、従来から用いられている高分子系制振構造体よりはるかに優れていることが分かる。又、Ｅとの比較にあって、制振構造体として第三層の存在は必須の要件であり、第二層と第三層の組み合わせによる効果が顕著であることが分かる。 As can be seen from this graph, the vibration damping structure of the present invention is extremely effective for all frequencies, and is far superior to the conventional polymer vibration damping structure. I understand. Further, in comparison with E, it is understood that the presence of the third layer as a damping structure is an essential requirement, and the effect of the combination of the second layer and the third layer is remarkable.
図３は本発明の第２例の効果Fを示すグラフである。即ち、この例は、図１の制振構造体にあって、第三層として同質のポリエステル繊維系スパンボンド不織布を二層としたものである。これは、予め二層としておくこともできるが、この例では、図１の制振構造体の第三層上に同効のスパンボンド不織布を更に一層重ね、３０ｇ／ｍ２程度のホットメルト材を介在させて熱融着させたものである。 FIG. 3 is a graph showing the effect F of the second example of the present invention. That is, this example is the vibration damping structure shown in FIG. 1, in which two layers of the same polyester fiber spunbond nonwoven fabric are used as the third layer. In this example, a spunbond nonwoven fabric having the same effect is further layered on the third layer of the vibration damping structure shown in FIG. 1 to obtain a hot melt material of about 30 g / m 2. It is heat-sealed by interposing.
図３にあって、周波数２５０Hz〜４ｋHz間の比較データであり、図１に示した本発明の第１の例Aとの対比である。
このグラフでも分かるように、第三層を２層とした場合（F）には、第三層を１層とした場合（A）よりも更に音圧レベルを下げることが可能となったものである。このことから、本発明の第三層を複数層とすることは制振効果上優れた構造体を提供できることとなったことが分かる。
FIG. 3 shows comparison data between frequencies of 250 Hz to 4 kHz, which is a comparison with the first example A of the present invention shown in FIG.
As can be seen from this graph, when the third layer is two layers (F), the sound pressure level can be further lowered than when the third layer is one layer (A). is there. From this, it can be seen that using a plurality of third layers of the present invention can provide a structure excellent in vibration damping effect.
本発明の制振構造体は軽量で、剛性も従来の高分子系より低くすることで、音響放射効率を高めることも抑制することができることとなったものである。又、スパンボンド不織布を適宜選択することにより、難燃性、撥水性が付与でき、カラー化、印刷も可能であり、デザイン性に優れたものとなる。更には、熱成形が可能であるので曲面部はもとより、凹凸面への適用も可能となったものである。
このため、本発明による制振構造体の特徴を生かして、自動車、車両、電子機器、家電製品など薄板構造の振動伝播による固体伝播音低減分野で広く適用可能である。
The vibration damping structure of the present invention is light in weight and has a rigidity lower than that of a conventional polymer system, so that it is possible to suppress an increase in acoustic radiation efficiency. Further, by appropriately selecting a spunbond nonwoven fabric, flame retardancy and water repellency can be imparted, colorization and printing are possible, and the design is excellent. Furthermore, since thermoforming is possible, not only a curved surface portion but also an uneven surface can be applied.
For this reason, the feature of the vibration damping structure according to the present invention can be utilized widely in the field of reducing solid propagation sound due to vibration propagation of a thin plate structure such as automobiles, vehicles, electronic devices, and home appliances.
１ 第一層
２ 第二層
３ 第三層
４ 離型紙
１０ 被制振基板
Ａ 本発明の第１の制振構造体の音圧レベル
Ｂ 制振構造体を用いない場合の音圧レベル
Ｃ 未加硫ブチルゴムの場合の音圧レベル
Ｄ 従来の高分子系制振構造体の場合の音圧レベル
Ｅ 第三層を省略した制振構造体の場合の音圧レベル
F 本発明の第２の制振構造体の音圧レベル
DESCRIPTION OF SYMBOLS 1 1st layer 2 2nd layer 3 3rd layer 4 Release paper 10 Damped board A Sound pressure level B of the 1st damping structure of this invention Sound pressure level C when not using a damping structure Sound pressure level D in case of vulcanized butyl rubber Sound pressure level E in case of conventional polymer damping structure E Sound pressure level in case of damping structure without the third layer
F Sound pressure level of the second vibration damping structure of the present invention
Claims (8)
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| JP2773880B2 (en) * | 1989-01-09 | 1998-07-09 | 早川ゴム 株式会社 | Building pipes |
| JP2706513B2 (en) * | 1989-05-11 | 1998-01-28 | 日東電工株式会社 | Damping sheet |
| JP3511383B2 (en) * | 1991-11-30 | 2004-03-29 | ダイニック株式会社 | Non-woven fabric for flooring |
| JPH08187805A (en) * | 1995-01-13 | 1996-07-23 | Kanebo Ltd | Sound insulation structure |
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