JP2020147060A - Sound absorbing material for vehicle exterior - Google Patents

Sound absorbing material for vehicle exterior Download PDF

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JP2020147060A
JP2020147060A JP2019043588A JP2019043588A JP2020147060A JP 2020147060 A JP2020147060 A JP 2020147060A JP 2019043588 A JP2019043588 A JP 2019043588A JP 2019043588 A JP2019043588 A JP 2019043588A JP 2020147060 A JP2020147060 A JP 2020147060A
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sound absorbing
absorbing material
vehicle exterior
bonding portion
thermocompression
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JP7187357B2 (en
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裕也 山内
Yuya Yamauchi
裕也 山内
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Howa Co Ltd
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  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
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Abstract

To improve inundation measures without heat pressing to a periphery again, in a sound absorbing material for vehicle exterior.SOLUTION: A sound absorbing material for vehicle exterior includes: a sound absorbing layer 20 which is a planar fiber web entwined containing thermoplastic synthetic fibers; and a water resistant cover layer 30 on which a planar non-woven fabric containing thermoplastic synthetic fibers that has been subjected to water repellent treatment is laminated on both sides of the sound absorbing layer 20. A peripheral edge of the water resistant cover layer 30 includes: a first thermal-compression bond part 41 that has been heat-pressed in a thickness direction within a predetermined width from an edge; and a groove-shaped second thermal-compression bond part 42 that is thermocompression-bonded relatively thinner in a thickness direction than the first thermal-compression bond part 41.SELECTED DRAWING: Figure 2

Description

本発明は、車両外装用吸音材に関する。 The present invention relates to a sound absorbing material for vehicle exterior.

従来、車両の外部から車内への騒音を吸収するための車両外装用吸音材が知られている（例えば、特許文献１参照）。ここで、車両外装用吸音材は、吸音層とこの吸音層の両面に耐水カバー層を有するものがある。ところで、車両外装用吸音材には、車両外装に配されるため飛水に晒されることが想定されるものとして、例えばボディーアンダーカバー、エンジンアンダーカバー、ホイールハウスプロテクタ、ドアに配設するものがある。これらの部位に係る車両外装用吸音材は、周縁を封止することで浸水対策が施される。係る封止は、車両外装用吸音材の周縁を厚み方向に熱プレスを施した熱圧着部が例示される。 Conventionally, a sound absorbing material for a vehicle exterior for absorbing noise from the outside of the vehicle to the inside of the vehicle has been known (see, for example, Patent Document 1). Here, some vehicle exterior sound absorbing materials have a sound absorbing layer and a water resistant cover layer on both sides of the sound absorbing layer. By the way, as the sound absorbing material for the vehicle exterior, for example, a body undercover, an engine undercover, a wheel house protector, and a material to be arranged on a door are assumed to be exposed to flying water because they are arranged on the vehicle exterior. is there. The sound absorbing material for the exterior of the vehicle related to these parts is provided with measures against inundation by sealing the peripheral edge. An example of such sealing is a thermocompression bonding portion in which the peripheral edge of a sound absorbing material for vehicle exterior is heat-pressed in the thickness direction.

特開２００２−３４８７６７号公報JP-A-2002-348767

しかしながら、車両外装用吸音材の周縁の熱圧着部は、吸音層、耐水カバー層の目付けのバラつき、形状などによって熱プレスが不十分な部位が生じ得る。このような熱プレスが不十分な部位は、耐水カバー層の剥がれによる浸水の懸念がある。そのため、再度、周縁の熱プレス処理を施す必要があることから更なる改善が望まれている。 However, the thermocompression bonding portion on the periphery of the sound absorbing material for vehicle exterior may have a portion where the heat pressing is insufficient depending on the appearance variation and shape of the sound absorbing layer and the water resistant cover layer. In such a part where the heat press is insufficient, there is a concern that water may enter due to peeling of the water resistant cover layer. Therefore, it is necessary to heat-press the peripheral edge again, and further improvement is desired.

本発明は、このような点に鑑みて創案されたものであり、本発明が解決しようとする課題は、車両外装用吸音材において、再度周縁の熱プレス処理を施すことなく、浸水対策の向上を図ることにある。 The present invention has been devised in view of these points, and the problem to be solved by the present invention is to improve measures against inundation in the sound absorbing material for vehicle exterior without performing heat pressing treatment on the peripheral edge again. Is to plan.

上記課題を解決する車両外装用吸音材の一つの特徴は、車両外装用吸音材であって、熱可塑性合成繊維を含んで交絡された面状の繊維ウェブである吸音層と、前記吸音層の両面のそれぞれにおいて撥水加工を施した熱可塑性合成繊維を含む面状の不織布が積層される耐水カバー層とを有し、前記耐水カバー層の周縁は、端縁から所定幅において厚み方向に熱プレスが施された第１熱圧着部と、前記第１熱圧着部よりも相対的に厚み方向に更に薄く熱圧着される溝状の第２熱圧着部と、を有する。 One of the features of the sound absorbing material for vehicle exterior that solves the above problems is the sound absorbing material, which is a planar fiber web entwined containing thermoplastic synthetic fibers, and the sound absorbing layer. Each of both sides has a water-resistant cover layer on which a planar non-woven fabric containing a thermoplastic synthetic fiber that has been subjected to a water-repellent finish is laminated, and the peripheral edge of the water-resistant cover layer heats in a predetermined width from the edge in the thickness direction. It has a first thermocompression bonding portion that has been pressed, and a groove-shaped second thermocompression bonding portion that is thermocompression-bonded to be thinner in the thickness direction than the first thermocompression bonding portion.

上記構成の一つの特徴及び利点は、耐水カバー層の周縁は、端縁から所定幅において厚み方向に熱プレスが施された第１熱圧着部と、第１熱圧着部よりも相対的に厚み方向に更に薄く熱圧着される溝状の第２熱圧着部と、を有する。そのため、吸音層、耐水カバー層の目付けのバラつき、形状などがあっても、一度の熱プレス処理において熱プレスが不十分な部位が生じるのを抑制することができる。よって、車両外装用吸音材において、再度周縁の熱プレス処理を施すことなく、浸水対策の向上を図ることができる。 One of the features and advantages of the above configuration is that the peripheral edge of the water resistant cover layer is relatively thicker than the first thermocompression bonding portion, which is heat-pressed in the thickness direction within a predetermined width from the edge, and the first thermocompression bonding portion. It has a groove-shaped second thermocompression bonding portion that is thermocompression bonded thinner in the direction. Therefore, even if there are variations in the texture and shape of the sound absorbing layer and the water resistant cover layer, it is possible to suppress the occurrence of a portion where the heat pressing is insufficient in one heat pressing process. Therefore, in the sound absorbing material for the vehicle exterior, it is possible to improve the measures against inundation without performing the heat pressing treatment on the peripheral edge again.

上記車両外装用吸音材について、前記第２熱圧着部は、前記耐水カバー層の周縁に沿って線状に且つ全周に亘って設けられていることが好ましい。 Regarding the sound absorbing material for vehicle exterior, it is preferable that the second thermocompression bonding portion is provided linearly and over the entire circumference along the peripheral edge of the water resistant cover layer.

上記構成の一つの特徴及び利点は、第２熱圧着部は、耐水カバー層の周縁に沿って線状に且つ全周に亘って設けられている態様であるため、外周の何れの部位からの浸水も抑制することができるため、より一層浸水対策の向上を図ることができる。 One of the features and advantages of the above configuration is that the second thermocompression bonding portion is provided linearly along the peripheral edge of the water resistant cover layer and over the entire circumference, so that the second thermocompression bonding portion is provided from any part of the outer periphery. Since inundation can also be suppressed, it is possible to further improve inundation countermeasures.

上記車両外装用吸音材について、前記第２熱圧着部は、前記第１熱圧着部の幅内の中間に配設されていることが好ましい。 Regarding the sound absorbing material for vehicle exterior, it is preferable that the second thermocompression bonding portion is arranged in the middle within the width of the first thermocompression bonding portion.

上記構成の一つの特徴及び利点は、第２熱圧着部が第１熱圧着部の幅内の中間に配設されていることにより、第２熱圧着部が途切れることを抑制出来るため、好適な車両外装用吸音材とすることができる。 One of the features and advantages of the above configuration is that the second thermocompression bonding portion is arranged in the middle within the width of the first thermocompression bonding portion, so that the second thermocompression bonding portion can be suppressed from being interrupted, which is preferable. It can be used as a sound absorbing material for vehicle exteriors.

本発明は上記各発明の手段をとることにより、車両外装用吸音材において、再度周縁の熱プレス処理を施すことなく、浸水対策の向上を図ることができる。 In the present invention, by taking the means of each of the above inventions, it is possible to improve the measures against inundation of the sound absorbing material for vehicle exterior without performing the heat pressing treatment on the peripheral edge again.

実施形態に係る車両外装用吸音材を示した平面図である。It is a top view which showed the sound absorbing material for vehicle exterior which concerns on embodiment. 図１のＩＩ−ＩＩ線断面斜視図である。FIG. 1 is a sectional perspective view taken along line II-II of FIG.

以下に、本発明の実施形態について図１、２を用いて説明する。本実施形態では、エンジンアンダーカバーに被覆される車両外装用吸音材１０を例示して説明する。本実施形態の車両外装用吸音材１０は、吸音層２０と、吸音層２０の両面のそれぞれにおいて耐水カバー層３０とが積層される。係る車両外装用吸音材１０は、耐水カバー層３０の周縁が厚み方向に熱プレスを施された熱圧着部４０によって封止されている。 Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. In the present embodiment, the vehicle exterior sound absorbing material 10 covered with the engine undercover will be described as an example. In the vehicle exterior sound absorbing material 10 of the present embodiment, the sound absorbing layer 20 and the water resistant cover layer 30 are laminated on both sides of the sound absorbing layer 20. The vehicle exterior sound absorbing material 10 is sealed by a thermocompression bonding portion 40 in which the peripheral edge of the water resistant cover layer 30 is heat-pressed in the thickness direction.

吸音層２０は、熱可塑性合成繊維を含んで交絡された面状の繊維ウェブである。吸音層２０における熱可塑性合成繊維として、ポリエチレン繊維、ポリプロピレン繊維、ポリスチレン繊維、ポリエステル繊維等、及びそれらの混合物からなる群から選択することができる。吸音層２０は、例えば、ポリプロピレン繊維の織布、ニット布又は不織布が挙げられる。ポリプロピレン繊維は、疎水性を有することから繊維間に水が侵入しにくく、使用中の吸音特性を維持することができるため好ましい。 The sound absorbing layer 20 is a planar fiber web containing and entangled with thermoplastic synthetic fibers. The thermoplastic synthetic fiber in the sound absorbing layer 20 can be selected from the group consisting of polyethylene fiber, polypropylene fiber, polystyrene fiber, polyester fiber and the like, and a mixture thereof. Examples of the sound absorbing layer 20 include a polypropylene fiber woven cloth, a knit cloth, and a non-woven fabric. Polypropylene fibers are preferable because they have hydrophobicity, so that water does not easily enter between the fibers and the sound absorbing characteristics during use can be maintained.

吸音層２０は、不織布を用いることが好ましい。不織布は、単位体積又は単位質量当たりの表面積が大きいことから同じ厚みの他の吸音層２０より軽量であってかつ優れた吸音性を示す。吸音層２０の密度、厚さは車両に配される部位によって様々であってよいが、一般的に吸音性を発揮するため、より密度が高い不織布とすることが有利である。吸音層２０の厚さは車両に配される部位によって様々であってよいが、一般的に吸音性を発揮するため、より厚い不織布を用いることが有利である。また、吸音層２０に用いられる熱可塑性合成繊維は、繊維径、繊維長について適宜選択できる。 It is preferable to use a non-woven fabric for the sound absorbing layer 20. Since the non-woven fabric has a large surface area per unit volume or unit mass, it is lighter than other sound absorbing layers 20 having the same thickness and exhibits excellent sound absorbing properties. The density and thickness of the sound absorbing layer 20 may vary depending on the portion arranged in the vehicle, but in general, it is advantageous to use a non-woven fabric having a higher density because it exhibits sound absorbing properties. The thickness of the sound absorbing layer 20 may vary depending on the portion arranged in the vehicle, but it is generally advantageous to use a thicker non-woven fabric because it exhibits sound absorbing properties. Further, the thermoplastic synthetic fiber used for the sound absorbing layer 20 can be appropriately selected with respect to the fiber diameter and the fiber length.

耐水カバー層３０は、吸音層２０の両面のそれぞれにおいて撥水加工を施した熱可塑性合成繊維を含む面状の不織布として積層される。耐水カバー層３０は、吸音層２０を保護しつつ、車両外装用吸音材１０に入射する音の反射を抑制し吸音層２０まで透過させる。耐水カバー層３０として、ポリオレフィン不織布層が例示される。ポリオレフィンは化学的安定性に優れていることから、耐水カバー層３０により吸音層２０が保護された車両外装用吸音材１０は、車外の大気、排気ガス、塩、腐食ガスなどへの曝露に対して高い耐久性を有する。 The water-resistant cover layer 30 is laminated as a planar non-woven fabric containing thermoplastic synthetic fibers that have been subjected to a water-repellent treatment on both sides of the sound absorbing layer 20. The water-resistant cover layer 30 protects the sound-absorbing layer 20 while suppressing reflection of sound incident on the vehicle exterior sound-absorbing material 10 and allowing the sound-resistant cover layer 30 to penetrate to the sound-absorbing layer 20. An example is a polyolefin non-woven fabric layer as the water resistant cover layer 30. Since polyolefin is excellent in chemical stability, the sound absorbing material 10 for vehicle exterior, in which the sound absorbing layer 20 is protected by the water resistant cover layer 30, is exposed to exposure to the atmosphere, exhaust gas, salt, corrosive gas, etc. outside the vehicle. Has high durability.

耐水カバー層３０としてのポリオレフィン不織布層は、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）などのポリオレフィンの繊維を含む。ポリオレフィン繊維はそれらの一部が溶融して互いに結合していてもよい。また、必要に応じてこれらのポリオレフィン繊維を結合するためのバインダーを用いてもよい。耐水カバー層３０と、吸音層２０とが化学的性質が類似する場合には、耐水カバー層３０におけるポリオレフィン不織布層と、ポリプロピレン繊維を含む吸音層２０とが、容易に溶着させることができる。耐水カバー層３０としてのポリオレフィン不織布層がポリプロピレン繊維を含むことが溶着強度を高める上で特に有利である。 The polyolefin non-woven fabric layer as the water resistant cover layer 30 contains polyolefin fibers such as polyethylene (PE) and polypropylene (PP). Some of the polyolefin fibers may be melted and bonded to each other. Further, if necessary, a binder for binding these polyolefin fibers may be used. When the water-resistant cover layer 30 and the sound-absorbing layer 20 have similar chemical properties, the polyolefin non-woven fabric layer in the water-resistant cover layer 30 and the sound-absorbing layer 20 containing polypropylene fibers can be easily welded. It is particularly advantageous that the polyolefin non-woven fabric layer as the water resistant cover layer 30 contains polypropylene fibers in order to increase the welding strength.

耐水カバー層３０としてのポリオレフィン不織布層の密度、厚さは車両に配される部位によって様々であってよいが、吸音層２０を保護し車両外装用吸音材１０に適切な吸音特性を付与する範囲であれば適宜選択設定することができる。 The density and thickness of the polyolefin non-woven fabric layer as the water-resistant cover layer 30 may vary depending on the portion arranged on the vehicle, but the range that protects the sound absorbing layer 20 and imparts appropriate sound absorbing characteristics to the vehicle exterior sound absorbing material 10. If so, it can be selected and set as appropriate.

耐水カバー層３０としてのポリオレフィン不織布層は、車両外装に配され飛水に晒されることに鑑みて、少なくとも撥水処理が施されている。また、撥油処理、難燃処理が施されていてもよい。これらの処理は、撥水剤、撥油剤、又は難燃剤の塗布又は原料ポリオレフィンへの混練などによって行うことができる。 The polyolefin non-woven fabric layer as the water resistant cover layer 30 is at least water repellent in view of being arranged on the vehicle exterior and being exposed to flying water. Further, oil repellent treatment and flame retardant treatment may be applied. These treatments can be performed by applying a water repellent, an oil repellent, or a flame retardant, or kneading the raw material polyolefin.

更に、耐水カバー層３０の周縁は、厚み方向に熱プレスを施された熱圧着部４０を有する。熱圧着部４０は、端縁から所定幅において厚み方向に熱プレスが施された第１熱圧着部４１と、第１熱圧着部４１よりも相対的に厚み方向に更に薄く熱圧着される溝状の第２熱圧着部４２と、を有する。第２熱圧着部４２は、耐水カバー層３０の周縁に沿って線状に且つ全周に亘って設けられている。また、第２熱圧着部４２は、第１熱圧着部４１の幅内の中間に配設されている。熱プレスの型は、第１熱圧着部を施す一対の第１プレス面と、一対の第１プレス面のうち、一方が凸形状であり他方が係る凸形状に対応した凹形状であって耐水カバー層３０の周縁に沿った線状溝形成部が設けられている。これにより、第２熱圧着部４２は、第１熱圧着部４１を施す熱プレスと同じ工程において設けられる。 Further, the peripheral edge of the water resistant cover layer 30 has a thermocompression bonding portion 40 that has been heat-pressed in the thickness direction. The thermocompression bonding portion 40 has a first thermocompression bonding portion 41 that has been thermocompression bonded in the thickness direction within a predetermined width from the edge, and a groove that is thermocompression bonded even thinner in the thickness direction than the first thermocompression bonding portion 41. It has a second thermocompression bonding portion 42 and a shape. The second thermocompression bonding portion 42 is provided linearly along the peripheral edge of the water resistant cover layer 30 and over the entire circumference. Further, the second thermocompression bonding portion 42 is arranged in the middle within the width of the first thermocompression bonding portion 41. The hot press mold is a pair of first press surfaces to which the first thermocompression bonding portion is applied and a pair of first press surfaces, one of which is convex and the other is concave corresponding to the convex shape and is water resistant. A linear groove forming portion is provided along the peripheral edge of the cover layer 30. As a result, the second thermocompression bonding portion 42 is provided in the same process as the thermal pressing for applying the first thermocompression bonding portion 41.

このように、実施形態に係る車両外装用吸音材１０によれば、耐水カバー層３０の周縁は、端縁から所定幅において厚み方向に熱プレスが施された第１熱圧着部４１と、第１熱圧着部４１よりも相対的に厚み方向に更に薄く熱圧着される溝状の第２熱圧着部４２と、を有する。そのため、吸音層２０、耐水カバー層３０の目付けのバラつき、形状などがあっても、一度の熱プレス処理において熱プレスが不十分な部位が生じるのを抑制することができる。よって、車両外装用吸音材１０において、再度周縁の熱プレス処理を施すことなく、浸水対策の向上を図ることができる。 As described above, according to the vehicle exterior sound absorbing material 10 according to the embodiment, the peripheral edges of the water resistant cover layer 30 are the first thermocompression bonding portion 41 which is thermocompression-pressed in the thickness direction within a predetermined width from the edge. It has a groove-shaped second thermocompression bonding portion 42 that is thermocompression bonded even thinner in the thickness direction than the thermocompression bonding portion 41. Therefore, even if the sound absorbing layer 20 and the water resistant cover layer 30 have variations in texture and shape, it is possible to suppress the occurrence of a portion where the heat pressing is insufficient in one heat pressing process. Therefore, in the sound absorbing material 10 for the vehicle exterior, it is possible to improve the measures against inundation without performing the heat pressing treatment on the peripheral edge again.

また、第２熱圧着部４２は、耐水カバー層３０の周縁に沿って線状に且つ全周に亘って設けられている態様であるため、外周の何れの部位からの浸水も抑制することができるため、より一層浸水対策の向上を図ることができる。 Further, since the second thermocompression bonding portion 42 is provided linearly along the peripheral edge of the water resistant cover layer 30 and over the entire circumference, it is possible to suppress water ingress from any portion of the outer peripheral surface. Therefore, it is possible to further improve the measures against inundation.

また、第２熱圧着部４２が第１熱圧着部４１の幅内の中間に配設されていることにより、第２熱圧着部４２が途切れることを抑制出来るため、好適な車両外装用吸音材１０とすることができる。 Further, since the second thermocompression bonding portion 42 is arranged in the middle within the width of the first thermocompression bonding portion 41, it is possible to suppress the interruption of the second thermocompression bonding portion 42, which is a suitable sound absorbing material for vehicle exterior. It can be 10.

以上、本発明の実施形態について説明したが、本発明の車両外装用吸音材は、本実施の形態に限定されず、その他各種の形態で実施することができるものである。 Although the embodiment of the present invention has been described above, the sound absorbing material for vehicle exterior of the present invention is not limited to the present embodiment, and can be implemented in various other forms.

１０ 車両外装用吸音材
２０ 吸音層
３０ 耐水カバー層
４０ 熱圧着部
４１ 第１熱圧着部
４２ 第２熱圧着部 10 Sound absorbing material for vehicle exterior 20 Sound absorbing layer 30 Water resistant cover layer 40 Thermocompression bonding part 41 First thermocompression bonding part 42 Second thermocompression bonding part

Claims (3)

車両外装用吸音材であって、
熱可塑性合成繊維を含んで交絡された面状の繊維ウェブである吸音層と、
前記吸音層の両面のそれぞれにおいて撥水加工を施した熱可塑性合成繊維を含む面状の不織布が積層される耐水カバー層とを有し、
前記耐水カバー層の周縁は、端縁から所定幅において厚み方向に熱プレスが施された第１熱圧着部と、前記第１熱圧着部よりも相対的に厚み方向に更に薄く熱圧着される溝状の第２熱圧着部と、を有する車両外装用吸音材。 A sound absorbing material for vehicle exteriors
A sound absorbing layer, which is a planar fiber web entwined with thermoplastic synthetic fibers,
Each of both sides of the sound absorbing layer has a water resistant cover layer on which a planar non-woven fabric containing a thermoplastic synthetic fiber that has been subjected to a water repellent treatment is laminated.
The peripheral edge of the water-resistant cover layer is thermocompression-bonded to a first thermocompression-bonding portion that has been thermocompression-pressed in the thickness direction within a predetermined width from the edge, and is thermocompression-bonded to be thinner in the thickness direction than the first thermocompression-bonding portion. A sound absorbing material for vehicle exterior having a groove-shaped second thermocompression bonding portion. 請求項１に記載の車両外装用吸音材であって、
前記第２熱圧着部は、前記耐水カバー層の周縁に沿って線状に且つ全周に亘って設けられている車両外装用吸音材。 The sound absorbing material for vehicle exterior according to claim 1.
The second thermocompression bonding portion is a sound absorbing material for vehicle exterior that is provided linearly along the peripheral edge of the water resistant cover layer and over the entire circumference. 請求項１または請求項２に記載の車両外装用吸音材であって、
前記第２熱圧着部は、前記第１熱圧着部の幅内の中間に配設されている車両外装用吸音材。 The sound absorbing material for vehicle exterior according to claim 1 or 2.
The second thermocompression bonding portion is a sound absorbing material for vehicle exterior that is arranged in the middle within the width of the first thermocompression bonding portion.
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JPH11132389A (en) * 1997-10-29 1999-05-21 Hitachi Ltd Vacuum heat insulating panel
JP2002348767A (en) * 2001-05-23 2002-12-04 Toyoda Gosei Co Ltd Sound-absorbing material and sound-absorbing material for exterior of automobile
US20110139542A1 (en) * 2006-05-23 2011-06-16 Bellmax Acoustic Pty Ltd Acoustic shield
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JPH02258239A (en) * 1989-03-30 1990-10-19 Hayashi Terenpu Kk Manufacture of composite base material for trim
JPH11132389A (en) * 1997-10-29 1999-05-21 Hitachi Ltd Vacuum heat insulating panel
JP2002348767A (en) * 2001-05-23 2002-12-04 Toyoda Gosei Co Ltd Sound-absorbing material and sound-absorbing material for exterior of automobile
US20110139542A1 (en) * 2006-05-23 2011-06-16 Bellmax Acoustic Pty Ltd Acoustic shield
JP2014000897A (en) * 2012-06-19 2014-01-09 Hirotani:Kk Fender liner and manufacturing method therefor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113370634A (en) * 2021-06-25 2021-09-10 湖北吉兴汽车部件有限公司 Method for improving edge layering of sound insulation pad

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