JP4255856B2 - Sound absorbing material and manufacturing method thereof - Google Patents

Sound absorbing material and manufacturing method thereof Download PDF

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JP4255856B2
JP4255856B2 JP2004032353A JP2004032353A JP4255856B2 JP 4255856 B2 JP4255856 B2 JP 4255856B2 JP 2004032353 A JP2004032353 A JP 2004032353A JP 2004032353 A JP2004032353 A JP 2004032353A JP 4255856 B2 JP4255856 B2 JP 4255856B2
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sound
felt material
density felt
adhesive
absorbing material
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JP2005221979A (en
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宏 木村
隆慶 清水
秀汽 福留
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Mitsubishi Motors Corp
Minoru Industrial Co Ltd
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Minoru Industrial Co Ltd
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Description

本発明は、自動車、鉄道車両、航空機、船舶、家屋等の建築物といったものの内装に使用して好適な吸音材とその製造方法に関する。 The present invention relates to a sound-absorbing material suitable for use in interiors of buildings such as automobiles, railway vehicles, aircraft, ships and houses, and a method for manufacturing the same.

近年における車両の高級化とエンジン高出力化とに伴い、エンジンや、パワーステアリング等の各種装置を音源とする駆動騒音が、車室内へ伝達するのを抑制して低減させる場合に、ダッシュボードの車室内側にフェルト材でなるダッシュパッドを設けるのが有効である。
従来、図７、図８に示すように、自動車のエンジンルーム０１と車室０２とを仕切るダッシュパネル０３の車室０２内側に、ダッシュパッド０４を設け、エンジンルーム０１に設置されたエンジン０５や各種補機装置等から発する駆動音が車室０２内へ浸入するのを阻止して、騒音レベルを低減し、車室内居住性を高めるようにしている。このダッシュパッド０４は、２枚のフェルト材０６，０７を接着剤により互いに接合した積層構造にしたもので、その製造方法は、成形下金型の上に一方のフェルト材０６をセットし、その上に接着剤を塗布し、次いで、他方のフェルト材０７を加熱した後、一方のフェルト材０６の上方にセットした後に、成型上金型で所定温度下で型締め（プレス）し、型開きした後、周縁をトリミングすることにより、図８に示されるような所定形状のダッシュパッド０４を製作する。 In recent years, with the upgrading of vehicles and higher engine output, dashboard noise is reduced when driving noise generated by the engine and various devices such as power steering is suppressed and transmitted to the passenger compartment. It is effective to provide a dash pad made of felt material on the vehicle interior side.
Conventionally, as shown in FIGS. 7 and 8, a dash pad 04 is provided inside the vehicle compartment 02 of the dash panel 03 for partitioning the engine compartment 01 and the vehicle compartment 02 of the automobile, and the engine 05 installed in the engine compartment 01 The driving sound emitted from various auxiliary devices or the like is prevented from entering the passenger compartment 02, so that the noise level is reduced and the comfort in the passenger compartment is improved. The dash pad 04 has a laminated structure in which two felt materials 06 and 07 are joined to each other with an adhesive, and the manufacturing method is to set one felt material 06 on a lower mold, Adhesive is applied to the top, and then the other felt material 07 is heated and then set above one felt material 06. Then, the mold is clamped (pressed) at a predetermined temperature with a molding upper mold, and the mold is opened. After that, the dash pad 04 having a predetermined shape as shown in FIG. 8 is manufactured by trimming the peripheral edge.

なお、上記のように、成型下金型と成型上金型との間で複数の素材を型締めして積層防音材を製作する技術として、例えば、特開２０００−２７６１７９号公報が公知である（特許文献１参照）。このものは、合成ゴムを含有する遮音材と不織布との間に、故紙を解繊して得られた天然木質繊維をバインダーとを混合してなる吸音材を挟んで３層に積層した構造の自動車用防音材であり、上記のように、２枚のフェルト材を互いに積層する構造のものとは相違し、関係がないものである。
特開２０００−２７６１７９号公報 As described above, for example, Japanese Patent Laid-Open No. 2000-276179 is known as a technique for manufacturing a laminated soundproof material by clamping a plurality of materials between a lower mold and an upper mold. (See Patent Document 1). This structure has a structure in which three layers are laminated between a sound insulating material containing synthetic rubber and a nonwoven fabric, with a sound absorbing material obtained by mixing a natural wood fiber obtained by defibrating the waste paper with a binder. It is a soundproof material for automobiles, and is different from the structure in which two felt materials are laminated to each other as described above, and is not related.
JP 2000-276179 A

しかしながら、上記従来の技術にあっては、接着剤単独では、フェルト材０６，０７に対する接着剤のしみ込み量が多いため、製作後において、図８（ｂ）に示すように、フェルト材の繊維同士が点接着の状態となり、接着不良を引き起こし、特に、曲面部や深絞り部で互いのフェルト材の接着強度が低下することによる剥離に起因する空洞０８を生じ、ダッシュパッドに要求される厚み寸法の精度が不均一となり不良品を発生してしまう。かかる不良品を製作しないために、各フェルト材の接着面にそれぞれ塗布する接着剤の量を増量する必要があるが、それにはコスト面や作業手間から一定の限界を来す問題がある。本発明は、このような問題点を解決するために、接着剤の使用量を低減しつつフェルト積層品の曲面部や深絞りでの接着強度を高め、故紙のリサイクルを図り、さらには、通気抵抗特性を所定値の範囲内に設定しながら、吸音特性に優れた吸音材とその製造方法を提供しようとするのが、本発明の目的（課題）である。 However, in the above prior art, since the adhesive alone has a large amount of adhesive penetration into the felt materials 06 and 07, the fibers of the felt material after production as shown in FIG. They are in a state of point bonding to each other, resulting in poor adhesion, and in particular, a void 08 caused by peeling due to a decrease in the adhesive strength of the felt material between the curved surface portion and deep drawing portion, resulting in a thickness required for the dash pad. Dimensional accuracy is uneven and defective products are generated. In order not to produce such a defective product, it is necessary to increase the amount of adhesive applied to the adhesion surface of each felt material. However, there is a problem in that it has a certain limit in terms of cost and labor. In order to solve such problems, the present invention increases the adhesive strength at the curved surface portion and deep drawing of the felt laminated product while reducing the amount of adhesive used, recycles waste paper, and further improves ventilation. An object (problem) of the present invention is to provide a sound-absorbing material excellent in sound-absorbing characteristics and a method for manufacturing the same while setting the resistance characteristics within a predetermined value range.

上記課題を解決するために、本発明においては次のような手段を講ずることとした。すなわち、請求項１記載の発明は、吸音材であって、繊維材を主成分とする高密度フェルト材または繊維材を主成分とする低密度フェルト材のいずれか一方のフェルト材に、接着剤を塗布し、その塗布面上に故紙の裁断チップ片を散布した後に、前記高密度フェルト材または前記低密度フェルト材のいずれか他方のフェルト材を接着して積層してなることを特徴とする。 In order to solve the above problems, the following measures are taken in the present invention. That is, the invention according to claim 1 is a sound absorbing material, and an adhesive is applied to one of a high density felt material mainly composed of a fiber material or a low density felt material mainly composed of a fiber material. And after spraying the waste paper cutting chip pieces on the coated surface, either the high density felt material or the low density felt material is adhered and laminated. .

請求項２記載の発明は、請求項１記載の吸音材に係り、前記高密度フェルト材および前記低密度フェルト材の繊維構成を、第１化繊：第１化繊よりも低融点成分でなる第２化繊：雑綿＝40：40：20の重量比としたことを特徴とする。 According to a second aspect of the invention relates to a sound-absorbing material according to claim 1 Symbol placement, the fiber structure of the high density felt material and the low-density felt material, the first synthetic fibers: first consisting of low-melting point component than the first chemical fiber It is characterized by having a weight ratio of 2-fiber: cotton = 40: 40: 20.

請求項３記載の発明は、請求項１乃至２のいずれか一項に記載の吸音材に係り、前記接着剤と前記故紙との重量比率を、100:10乃至100:5の範囲にしたことを特徴とする。 A third aspect of the present invention relates to the sound absorbing material according to any one of the first to second aspects, wherein the weight ratio of the adhesive to the waste paper is in the range of 100: 10 to 100: 5. It is characterized by.

請求項４記載の発明は、吸音材の製造方法であって、繊維材を主成分とする高密度フェルト材を加熱して所定形状の成型面を有する金型に配置して型締めした後、型開きした前記高密度フェルト材に水溶性接着剤を噴霧塗布し、その塗布面に故紙の裁断チップ片を散布してから、低密度フェルト材を載せて配置して型締めした後、型開きして所定形状の吸音材を得ることを特徴とする。 Invention of Claim 4 is a manufacturing method of a sound-absorbing material, after heating the high-density felt material which has a fiber material as a main component, arranging in the metallic mold which has the molding surface of a predetermined shape, and clamping it, After spraying a water-soluble adhesive on the high-density felt material that has been opened and spraying the waste paper cutting chip pieces on the application surface, placing the low-density felt material and clamping the mold, then opening the mold Thus, a sound absorbing material having a predetermined shape is obtained.

本発明によると、次のような効果を奏することができる。
請求項１記載の発明によれば、繊維材を主成分とする高密度フェルト材または繊維材を主成分とする低密度フェルト材のいずれか一方のフェルト材に、接着剤を塗布し、その塗布面上に、例えば廃札、雑誌、新聞紙、地図、段ボール等のセルロースを主体とする故紙を、縦１〜２ｍｍ、横１０〜１５ｍｍの大きさに裁断したチップ片を散布するので、フェルト材の場合には、チップ片への接着剤の滲み込みが良好となって接着剤の保持性を高め、それによりフェルト材へ接着剤が吸収されるのを抑制し、チップ片を染み通ってその表面に接着剤が滲み出たりする結果、高低両密度のフェルト材表面に塗布された接着剤が点状ではなく面状に存在することとなり、高密度フェルト材と低密度フェルト材の接着強度が格段に向上し、従来のようにフェルト材を積層してなる吸音材の曲面部や深絞り部で生じていた接着強度低下による剥離現象を未然に防止できるばかりか、接着剤の塗布は、いずれか一方のフェルト材、すなわち片面に塗布するだけでよいので、接着剤の使用量を大幅に低減でき、それだけ製作手間を少なくでき、さらには、接着剤の保持性を維持するために故紙を利用しているので、環境資源のリサイクルを図れ、結果として吸音性能に優れ、剥離強度が高く、軽量化が図れて、コスト安価な自動車、鉄道車両、航空機、船舶、家屋等の建築物といったものの内装に使用可能な吸音材を実現できる利点がある。 According to the present invention, the following effects can be achieved.
According to invention of Claim 1, an adhesive agent is apply | coated to any one of the high density felt material which has a fiber material as a main component, or the low density felt material which has a fiber material as a main component, The application | coating For example, waste paper, magazines, newspapers, maps, and waste paper mainly made of cellulose, such as cardboard, are sprinkled with chip pieces cut into a size of 1 to 2 mm in length and 10 to 15 mm in width. In this case, the penetration of the adhesive into the chip piece is improved and the retention of the adhesive is improved, thereby suppressing the absorption of the adhesive into the felt material and penetrating the chip piece to its surface. As a result, the adhesive applied to the surface of the felt material of both high and low density exists in the form of a plane instead of dots, and the adhesive strength between the high density felt material and the low density felt material is remarkably high. Like the traditional In addition to preventing the peeling phenomenon due to the decrease in adhesive strength that occurred at the curved surface and deep drawing part of the sound absorbing material made by laminating the felt material, the adhesive can be applied to either one of the felt materials, that is, one side. Since it only needs to be applied, the amount of adhesive used can be greatly reduced, and the labor required for production can be reduced. In addition, waste paper is used to maintain adhesive retention, so environmental resources can be recycled. As a result, it is possible to realize a sound-absorbing material that is excellent in sound-absorbing performance, has high peel strength, can be reduced in weight, and can be used for the interior of buildings such as automobiles, railway vehicles, aircraft, ships, and houses that are inexpensive. There are advantages.

請求項２記載の発明によれば、高密度フェルト材および低密度フェルト材の繊維構成を、第１化繊：第１化繊よりも低融点成分でなる第２化繊：雑綿＝40：40：20の重量比としたので、例えば、第２化繊をポリプロピレン、ポリエチレン、ポリエステルといった材質の化繊にすると、その融点が吸音材の型締め製造過程における加熱温度（例えば、２００℃前後）以下で溶ける。そのため、第２化繊をバインダーとして第１化繊や雑綿を結合する機能を呈して、高低両密度のフェルト材の型締めによる形状保持性を向上できる。 According to invention of Claim 2, the fiber composition of a high density felt material and a low density felt material is made into the 1st synthetic fiber: the 2nd synthetic fiber which consists of a low melting point component rather than the 1st synthetic fiber: a cotton wool = 40: 40: 20 Therefore, for example, when the second synthetic fiber is made of a material such as polypropylene, polyethylene, or polyester, the melting point thereof is melted below the heating temperature (for example, around 200 ° C.) in the process of clamping the sound absorbing material. For this reason, the function of binding the first synthetic fiber and the miscellaneous cotton using the second synthetic fiber as a binder can be exhibited, and the shape retainability by clamping the high and low density felt material can be improved.

請求項３記載の発明によれば、接着剤と故紙との重量比率が、100:10乃至100:5の範囲に設定されるため、型開きして取り出された吸音材の接着力を高く維持でき、従来のように接着不良による高密度フェルト材と低密度フェルト材との積層品である吸音材の曲面部や深絞り部における剥離を生じることを回避でき、成型後に吸音材が型ずれすることがなく、どの断面をとってみても、その厚み寸法が一定した寸法精度の良好な吸音材を実現できる利点がある。 According to the invention described in claim 3 , since the weight ratio of the adhesive to the waste paper is set in the range of 100: 10 to 100: 5, the adhesive force of the sound absorbing material taken out by opening the mold is kept high. It is possible to avoid the occurrence of peeling at the curved surface portion or deep drawing portion of the sound absorbing material, which is a laminate of a high density felt material and a low density felt material due to poor adhesion as in the past, and the sound absorbing material is out of shape after molding. No matter which cross section is taken, there is an advantage that a sound-absorbing material having a constant dimensional accuracy and a good dimensional accuracy can be realized.

請求項４記載の発明によれば、繊維材を主成分とする高密度フェルト材を加熱して所定形状の成型面を有する金型に配置して型締めした後、型開きした前記高密度フェルト材に水溶性接着剤を噴霧塗布し、その塗布面に故紙の裁断チップ片を散布してから、低密度フェルト材を載せて配置して型締めした後、型開きして所定形状の吸音材を得るようにしているので、接着剤の使用量を大幅に低減できて製作手間を少なくでき、故紙再利用による環境資源の有効活用を図り、さらに、剥離強度が高く、軽量化の図れるコスト安価な自動車、鉄道車両、航空機、船舶、家屋等の建築物といったものの内装に使用可能な吸音材を製造できる効果を奏する。 According to the invention of claim 4 , the high-density felt material mainly composed of a fiber material is heated, placed in a mold having a molding surface of a predetermined shape, clamped, and then the mold is opened. After spraying a water-soluble adhesive on the material, spraying waste paper cutting chip pieces on the application surface, placing a low-density felt material, clamping the mold, opening the mold, and then opening the mold Therefore, the amount of adhesive used can be greatly reduced, making it possible to reduce the production effort, making effective use of environmental resources by reusing the old paper, and having high peel strength and low cost. It is possible to produce a sound absorbing material that can be used for interiors of buildings such as automobiles, railway vehicles, aircraft, ships, and houses.

本発明の第１実施の形態に係る吸音材とその製造方法を、図１〜図６に基づいて詳述する。図１は吸音材の製造工程を示す製造工程図、図２は故紙の平面形状を示す平面図、図３は製造工程を経て完成した吸音材の一部断面を示す要部拡大断面図である。
吸音材１の製造方法は、図１に示すように、工程(ａ)において所定形状の成型面を有する下金型２の上方に、予め熱風で１６０℃〜２２０℃の範囲、好ましくは略２００℃に加熱しておいた硬めの高密度フェルト材３を搬入し、下金型２上に位置合わせしてセットした後に、上金型９により所定時間、型締め（プレス）する。
ここで、高密度フェルト材３は、繊維材を主成分とし、その繊維構成を、例えば、後述する低密度フェルト材と同様に、第１の化繊：第２の化繊：雑綿の重量比が４０：４０：２０となるようにしたものが使用される。また、第２の化繊は、後述する低密度フェルト材のそれと同様に、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリエステルといった低融点成分でなる。さらに、高密度フェルト材４の目付けは、８００〜１２００ｇ/m2、厚さ5〜10mmを使用し、好ましくは１０００ｇ/m2、厚さ５mmがよく、後述する低密度フェルト材よりも硬いハード層としてのフェルト材を形成する。
所定時間、型締めすると、低融点の第２化繊が溶けて、第１化繊と雑綿とがバインドされ、所定形状の高密度フェルト材３となり、型開きをして工程（b）に移す。 The sound-absorbing material and its manufacturing method according to the first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a manufacturing process diagram showing a manufacturing process of a sound absorbing material, FIG. 2 is a plan view showing a planar shape of a waste paper, and FIG. 3 is an enlarged sectional view of a main part showing a partial cross section of the sound absorbing material completed through the manufacturing process. .
As shown in FIG. 1, the sound absorbing material 1 is manufactured in a range of 160 ° C. to 220 ° C. with hot air in advance in the step (a) having a molding surface having a predetermined shape, preferably about 200 ° C. The hard high-density felt material 3 heated to 0 ° C. is carried in, positioned and set on the lower mold 2, and then clamped (pressed) by the upper mold 9 for a predetermined time.
Here, the high-density felt material 3 has a fiber material as a main component, and the fiber configuration thereof is, for example, similar to a low-density felt material described later, in which the weight ratio of the first synthetic fiber: second synthetic fiber: cotton is What is set to 40:40:20 is used. The second synthetic fiber is composed of low melting point components such as polypropylene (PP), polyethylene (PE), and polyester, similar to that of the low density felt material described later. Furthermore, the basis weight of the high-density felt material 4 is 800 to 1200 g / m 2 and a thickness of 5 to 10 mm, preferably 1000 g / m 2 and a thickness of 5 mm, which is a hard layer harder than the low-density felt material described later. Forming felt material.
When the mold is clamped for a predetermined time, the low-melting-point second synthetic fibers are melted, and the first synthetic fibers and the cotton are bound to form a high-density felt material 3 having a predetermined shape, and the mold is opened, and the process proceeds to step (b).

工程(ｂ)においては、スプレー４から水溶性エマルジョンの接着剤５を高密度フェルト材３上面に塗布するが、その場合の塗布量は、例えば、５０〜１５０ｇ/m2の範囲内で適宜塗布され、塗布量と塗布面積の均一化を図るようにする。 In the step (b), the adhesive 5 of the water-soluble emulsion is applied from the spray 4 to the upper surface of the high-density felt material 3, and the coating amount in that case is appropriately applied within the range of 50 to 150 g / m 2, for example. The application amount and the application area are made uniform.

工程(ｃ)では、接着剤５の塗布面６に故紙７を散布する工程である。上方から散布される故紙７は、廃札、雑誌、新聞紙、地図、段ボール等の故紙が使用されるが、本実施の形態では、廃札を例えば、図２のように、縦寸法が１ｍｍ、横寸法が１０ｍｍの長方形状に細かく裁断したチップ片が使用され、その場合の故紙散布量は、例えば、２，５〜７，５ｇ/m2の範囲内で散布される。 In the step (c), the waste paper 7 is sprayed on the application surface 6 of the adhesive 5. As the waste paper 7 scattered from above, waste paper such as waste bills, magazines, newspapers, maps, cardboards, and the like are used. In this embodiment, the waste bills have a vertical dimension of 1 mm as shown in FIG. Chip pieces finely cut into a rectangular shape with a lateral dimension of 10 mm are used, and the amount of waste paper sprayed in that case is sprayed within a range of 2,5-7,5 g / m 2, for example.

工程(d)で、高密度フェルト材３と同様の繊維構成を有する柔らかい低密度フェルト材８が、予め余熱されて準備され、これを下金型２上方に搬入し、工程（e）で上金型９により、好ましくは適度の加熱された温度条件下で型締め（プレス）した後、そのままの状態でしばらく冷却し、工程（f）で型開きして成型された吸音材１を下金型２から取り出すことで吸音材１の製作は完了する。 In step (d), a soft low-density felt material 8 having the same fiber structure as that of the high-density felt material 3 is preheated and prepared in advance, and this is carried over the lower mold 2 and then moved upward in step (e). The mold 9 is preferably clamped (pressed) under moderately heated temperature conditions, then cooled for a while and then opened in the step (f), and the molded sound-absorbing material 1 is transferred to the lower mold. By taking out from the mold 2, the production of the sound absorbing material 1 is completed.

また、本実施の形態の場合、接着剤５と故紙７の重量比率を、100:10〜100:5の範囲にすることで、高密度フェルト材３と低密度フェルト材８との接着性が良好となるようにしている。 In the case of this embodiment, the adhesiveness between the high-density felt material 3 and the low-density felt material 8 can be improved by setting the weight ratio of the adhesive 5 and the waste paper 7 in the range of 100: 10 to 100: 5. I try to be good.

こうして型締めにより得られた吸音材１は、図３にその断面構造を模式的に示すように、高密度フェルト材３と低密度フェルト材８とが接着剤５により積層され、両フェルト材３，８の中間層の接着剤５層に、故紙７が介在する構造を有し、その場合における吸音材１の通気抵抗は、0,20〜0,40KPa・s/mとなるように設定されているものである。ダッシュパネルの形状に合うように、製作された吸音材１の周縁を適宜カットして所定形状をなすダッシュパネルに装着可能な吸音材（完成品）を得る。 The sound absorbing material 1 thus obtained by clamping is laminated with a high density felt material 3 and a low density felt material 8 with an adhesive 5 as schematically shown in FIG. , 8 has a structure in which the waste paper 7 is interposed between the five adhesive layers of the intermediate layer, and the ventilation resistance of the sound absorbing material 1 in this case is set to be 0, 20 to 0, 40 KPa · s / m. It is what. A sound absorbing material (finished product) that can be attached to a dash panel having a predetermined shape is obtained by appropriately cutting the periphery of the manufactured sound absorbing material 1 so as to match the shape of the dash panel.

ここで、本出願人は、吸音率について、上記製作方法により製造された吸音材１（以下「開発品」という）と、上記従来の方法により製作された従来品１および従来品２との性能比較試験を行った結果、図５，図６のような結果を得ることができた。すなわち、前記のとおりに示すような断面の開発品、従来品１および従来品２の各吸音材の低密度フェルト材（ソフト層）を音源に向けて添設（装着）し、音源から発する音について、図５に示すように、１／３オクターブバンド周波数を横軸に、縦軸を吸音率とする吸音特性グラフが得られた。それによると、ソフト層から音が入射する場合には、４００Ｈｚ〜３，０ＫＨｚまでの周波数帯域で開発品の吸音材１が、従来品１，２のそれらよりも吸音率が優れていることが判った。 Here, regarding the sound absorption coefficient, the applicant of the present invention is the performance of the sound absorbing material 1 manufactured by the above manufacturing method (hereinafter referred to as “development product”) and the conventional product 1 and the conventional product 2 manufactured by the conventional method. As a result of the comparative test, results as shown in FIGS. 5 and 6 were obtained. In other words, the low-density felt material (soft layer) of each sound-absorbing material of the developed product with the cross section as shown above, the conventional product 1 and the conventional product 2 is attached (mounted) toward the sound source, and the sound emitted from the sound source As shown in FIG. 5, a sound absorption characteristic graph was obtained with the 1/3 octave band frequency as the horizontal axis and the vertical axis as the sound absorption coefficient. According to this, when sound is incident from the soft layer, the developed sound absorbing material 1 has a better sound absorption rate than those of the conventional products 1 and 2 in the frequency band from 400 Hz to 30 KHz. understood.

同様に、吸音材の高密度フェルト材（ハード層）を音源に向けて装着した場合には、図６に示す吸音特性グラフを得た。これによれば、ハード層より音を入射させた場合には、人間の聴覚に一番心地よく響くとされる８００Ｈｚから上方の２ＫＨｚの周波数帯域で従来品１，２のものよりも吸音率性能が優れている結果となった。 Similarly, when the high-density felt material (hard layer) of the sound absorbing material is mounted facing the sound source, the sound absorbing characteristic graph shown in FIG. 6 was obtained. According to this, when sound is incident from the hard layer, the sound absorption performance is higher than that of the conventional products 1 and 2 in the frequency band of 2 kHz above 800 Hz, which is said to sound most comfortable for human hearing. The result was excellent.

以上のことから、本実施の形態によれば、接着剤の塗布は、高密度フェルト材片面に塗布するだけでよいので、接着剤の使用量を大幅に低減でき、それだけ製作手間を少なくできる効果がある。また、接着剤の保持性を維持するために故紙を利用しているので、環境資源のリサイクルを図れる。また、吸音性能に優れ、かつ、形状保持性に優れると共に剥離強度が高く、軽量化が図れて、コスト安価な自動車、鉄道車両、航空機、船舶、家屋等の建築物といったものの内装に使用可能な吸音材を得ることができる効果がある From the above, according to the present embodiment, the adhesive can be applied only to one surface of the high-density felt material, so that the amount of adhesive used can be greatly reduced, and the manufacturing effort can be reduced accordingly. There is. In addition, since waste paper is used to maintain the adhesive retainability, environmental resources can be recycled. In addition, it has excellent sound absorption performance, excellent shape retention, high peel strength, light weight, and can be used for interiors of buildings such as automobiles, railway vehicles, aircraft, ships, and houses that are inexpensive. There is an effect that a sound-absorbing material can be obtained.

以上、本発明の実施の形態を図面より詳述してきたが、具体的な構成はこの実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等があっても本発明に含まれる。
例えば、上記実施の形態では、工程（ａ）において、先に下金型２の上に高密度フェルト材３をセットした場合について説明したが、この代わりに低密度フェルト材８をセットして製作するようにすることも可能である。 Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention.
For example, in the above embodiment, the case where the high density felt material 3 is first set on the lower mold 2 in the step (a) has been described, but instead, the low density felt material 8 is set and manufactured. It is also possible to do so.

吸音材の製造工程を示す製造工程図である。It is a manufacturing process figure which shows the manufacturing process of a sound-absorbing material. 故紙の平面形状を示す平面図である。It is a top view which shows the planar shape of waste paper. 製造工程を経て完成した吸音材の一部断面を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the partial cross section of the sound-absorbing material completed through the manufacturing process. ダッシュパネルへ吸音材を装着して行う試験条件を説明する断面図である。It is sectional drawing explaining the test conditions performed by attaching a sound-absorbing material to a dash panel. 試験結果を示す特性グラフである。It is a characteristic graph which shows a test result. 試験結果を示す特性グラフである。It is a characteristic graph which shows a test result. 従来の装置を模式的に示した概略断面図である。It is the schematic sectional drawing which showed the conventional apparatus typically. （ａ）は上記従来の装置における防音材の外観斜視図、（ｂ）は（ａ）の丸部における拡大図である。(A) is an external appearance perspective view of the soundproofing material in the said conventional apparatus, (b) is an enlarged view in the round part of (a).

符号の説明Explanation of symbols

１ 吸音材
２ 下金型
３ 高密度フェルト材（ハード層）
４ スプレー
５ 接着剤
６ 接着面
７ 故紙
８ 低密度フェルト材（ソフト層）
９ 上金型 1 Sound absorbing material 2 Lower mold 3 High density felt material (hard layer)
4 Spray 5 Adhesive 6 Adhesive surface 7 Waste paper 8 Low density felt material (soft layer)
9 Upper mold

Claims (4)

繊維材を主成分とする高密度フェルト材または繊維材を主成分とする低密度フェルト材のいずれか一方のフェルト材に、接着剤を塗布し、その塗布面上に故紙の裁断チップ片を散布した後に、前記高密度フェルト材または前記低密度フェルト材のいずれか他方のフェルト材を接着して積層してなることを特徴とする吸音材。 Adhesive is applied to either one of the high-density felt material mainly composed of fiber material or the low-density felt material mainly composed of fiber material, and the waste paper cutting chip pieces are spread on the coated surface. Then, the sound absorbing material is formed by adhering and laminating one of the high density felt material and the low density felt material. 前記高密度フェルト材および前記低密度フェルト材の繊維構成を、第１化繊：第１化繊よりも低融点成分でなる第２化繊：雑綿＝40：40：20の重量比としたことを特徴とする請求項１項に記載の吸音材。 The fiber configuration of the high density felt material and the low density felt material is a weight ratio of first synthetic fiber: second synthetic fiber composed of a lower melting point component than the first synthetic fiber: miscellaneous cotton = 40: 40: 20. The sound-absorbing material according to claim 1 . 前記接着剤と前記故紙との重量比率を、100:10乃至100:5の範囲にしたことを特徴とする請求項１乃至２のいずれか一項に記載の吸音材。 The sound absorbing material according to any one of claims 1 to 2 , wherein a weight ratio between the adhesive and the waste paper is in a range of 100: 10 to 100: 5. 繊維材を主成分とする高密度フェルト材を加熱して所定形状の成型面を有する金型に配置して型締めした後、型開きした前記高密度フェルト材に接着剤を噴霧塗布し、その塗布面に故紙の裁断チップ片を散布してから、低密度フェルト材を載せて配置して型締めした後、型開きして所定形状の吸音材を得ることを特徴とする吸音材の製造方法。 After heating the high-density felt material mainly composed of fiber material and placing it in a mold having a molding surface of a predetermined shape, the adhesive is sprayed and applied to the high-density felt material that has been opened, A method for producing a sound-absorbing material, characterized in that a waste-paper cutting chip piece is sprayed on a coated surface, a low-density felt material is placed, clamped, and then mold-opened to obtain a sound-absorbing material having a predetermined shape .
JP2004032353A 2004-02-09 2004-02-09 Sound absorbing material and manufacturing method thereof Expired - Fee Related JP4255856B2 (en)

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