JP2010234991A - Sound insulating material for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize weight saving and enhancement of acoustic absorption characteristic, and reduce a weight and costs in a sound insulating material for a vehicle mounted to an indoor surface side of a vehicle body panel. <P>SOLUTION: An insulator dash 20 mounted to an indoor surface side of a vehicle body panel 10 is constituted so that an oscillation layer 50 made of a polyolefin base resin foam having a self-fusion property is interposed between a first sound insulating layer 30 positioned on the vehicle body panel 10 side and a second sound insulating layer 40 positioned on a compartment R side. Then, due to the self-fusion property when the oscillation layer 50 is heated and fused, the oscillation layer 50 is rigidly and integrally jointed to the sound insulating layers 30, 40 by an anchor effect. Accordingly, a conventional adhesion layer can be eliminated, so as to reduce a weight and costs. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle soundproofing material that is attached to the interior side of a vehicle body panel, and more particularly to a vehicle soundproofing material that improves sound insulation performance and sound absorption performance in a well-balanced manner, achieves weight reduction, and can be manufactured at low cost. .

  Usually, in order to enhance the quietness of the vehicle interior, various soundproof materials are attached to the interior side of the vehicle body panel as the soundproof structure of the vehicle. As an example of this soundproof material, there is an insulator dash attached to the interior side of a dash panel that partitions an engine room and a vehicle interior. A conventional example of this insulator dash will be described with reference to FIG. In the drawing, an insulator dash 2 is attached to the interior surface side of the dash panel 1 that divides the engine room E and the vehicle compartment R, and this insulator dash 2 is enlarged as shown in FIG. A sound absorbing layer 3 for absorbing noise transmitted through the dash panel 1 into the vehicle interior R by a porous sound absorbing function and a skin layer 4 laminated on the surface of the sound absorbing layer 3 are configured.

  As a material of the sound absorbing layer 3 and the skin layer 4 in the conventional insulator dash 2, the sound absorbing layer 3 can be made of a material that can obtain a porous sound absorbing function, such as felt, nonwoven fabric mat, or foam. In addition, as shown in FIG. 11, as the skin layer 4, a sound insulating skin layer 4A made of a high-density material such as a recycled rubber sheet or a recycled PVC sheet is used, and recently, it has been replaced with the sound insulating skin layer 4A. In order to achieve weight reduction, as shown in FIG. 12, a lightweight insulator dash 2A in which a resonance layer 5 made of a resin foam, a resin film, or the like is laminated on the sound absorbing layer 3 has also been proposed. As shown in FIG. 12 (a), the resonance layer 5 can be used in a form in which the resonance layer 5 is attached to the interior surface side of one sound absorbing layer 3, or in a manner as shown in FIG. 12 (b). There is a configuration in which the resonance layer 5 is interposed between the sound absorbing layers 3A and 3B of the layers, and in any case, the adhesion between the sound absorbing layer 3 (3A and 3B) and the resonance layer 5 is a joint of both. An adhesive layer 6 is provided on the surface.

  Here, the configuration of the conventional example of the sound insulation type insulator dash 2 is shown in Patent Document 1, and the configuration of the conventional example of the lightweight insulator dash 2A is described in Patent Document 2.

Japanese Utility Model Publication No. 7-5966

JP 2005-227747 A

  Thus, conventionally, for example, as shown in FIG. 11, the sound insulation type insulator dash 2 uses a heavy material such as a recycled rubber sheet or a recycled PVC sheet as the sound insulating skin layer 4A. However, this is a factor that goes against weight reduction and reduces fuel efficiency and mounting workability. Furthermore, in the sound absorption performance, the sound absorption effect of high-frequency noise is not sufficient, and there is a point that the sound absorption performance should be improved compared to the sound insulation performance, and there is a problem that satisfactory soundproof performance cannot be obtained. .

  On the other hand, the lightweight insulator dash 2A shown in FIG. 12 can contribute to weight reduction because it uses the lightened resonance layer 5 instead of the sound-insulating skin layer 4A, which increases the weight. 3A, 3B) In addition to the porous sound absorption function of the resonance layer 5, the resonance action of the resonance layer 5 can be expected, and the sound insulation performance and the sound absorption performance tend to be improved in a balanced manner. In order to integrate them, the adhesive layer 6 is necessary, and since the mass of the adhesive layer 6 is taken into account, it is not suitable for weight reduction and the amount of use of the adhesive layer 6 increases, resulting in an increase in cost. Disadvantages have been pointed out.

  The present invention has been made in view of such circumstances, and is a vehicle soundproofing material mounted on the interior side of a vehicle body panel, and can improve sound insulation performance and sound absorption performance in a well-balanced manner. An object of the present invention is to provide a vehicle soundproofing material that can be manufactured at low cost while achieving weight reduction.

  In order to achieve the above object, the present invention is a vehicle soundproofing material mounted on the interior side of a vehicle body panel, and includes a first sound absorbing layer located on the vehicle body panel side and a second soundproof layer located on the vehicle interior side. In the vehicle soundproofing material constituted by a laminated structure in which a resonance layer having a resonance function is interposed between the sound absorbing layer and the sound absorbing layer, the resonance layer is made of a polyolefin resin foam having self-bonding property, The resonance layer is bonded and integrated with the sound absorption layer by an anchor effect due to self-bonding property when the resonance layer is heated and melted.

  Here, the installation location of the vehicle soundproofing material can be applied to the interior side of the vehicle body panel, the interior side of the luggage room, the interior side of the trunk room, the interior side of the engine room, and the like. Examples of the product form include an insulator dash, a roof trim, a soundproof portion in a floor carpet, a luggage room, a trunk trim, and the like. The basic structure of the vehicle soundproofing material according to the present invention is a three-layer structure in which a resonance layer is interposed between two sound absorbing layers. The sound-absorbing layer on the abutting side is classified as a first sound-absorbing layer, and the sound-absorbing layer laminated on the indoor side through the resonance layer with respect to the first sound-absorbing layer is classified as a second sound-absorbing layer.

First, the first sound absorbing layer and the second sound absorbing layer have basically the same structure and are different only in the installation location. As the material of these sound absorbing layers, felt, polyester represented by PET (polyethylene terephthalate), and the like. Synthetic non-woven fabrics such as fibers, fiber aggregates made of paper (pulp and the like), resin foams such as urethane foam, and the like can be used. The thickness of both sound absorbing layers is set to 1 to 70 mm, and the density is set to 0.01 to 1.0 g / cm ³ .

Next, as a material of the resonance layer interposed between the first sound absorbing layer and the second sound absorbing layer, a polyolefin resin foam having a thickness of 0.1 to 5.0 mm, preferably 2.0 mm. Hereinafter, the density is 0.02 to 1.2 g / cm ³ , the surface density is 500 g / m ² or less, and the air permeability may be either a non-breathable structure or a breathable structure, provided that the breathable structure In this case, the air flow rate is set to 1 to 25 cm ³ / cm ² · sec (a numerical value measured by a Frazier type tester).

  Furthermore, the first sound absorbing layer, the second sound absorbing layer, and the resonance layer are joined and integrated with the sound absorbing layer by an anchor effect by self-bonding of a polyolefin resin foam that is a material of the resonance layer. That is, the resonance layer does not have an adhesive layer, and has a structural feature in that it has both functions of the resonance layer and the adhesive layer.

  Therefore, the resonance layer made of the polyolefin resin foam is heat-softened and softened and melted. Further, the preheated first and second sound absorbing layers are pressure-bonded from both sides, or the first or second sound absorbing layer and the resonance layer are laminated in advance, and this laminate and the other sound absorbing layer are laminated. May be thermocompression-bonded or may be press-molded after an integral heat treatment in a state where three layers of two sound absorbing layers and a resonance layer are laminated.

  As is clear from the above configuration, the vehicle soundproofing material according to the present invention is a laminated structure in which a resonance layer is interposed between the first sound absorbing layer and the second sound absorbing layer, and includes a plurality of sound absorbing layers. Can effectively absorb noise in the high frequency range and improve the sound absorption performance, while improving the sound insulation performance by the resonance action of the resonance layer can improve the sound insulation performance and sound absorption performance in a well-balanced manner. Especially, since the resonance layer is self-adhesive and does not require an adhesive layer, the weight of the soundproofing material can be reduced, the material cost can be reduced, the processing process can be rationalized, and the product cost can be reduced. be able to.

  Next, in a preferred embodiment of the vehicle soundproofing material according to the present invention, at least one of the resonance layer and the first and second sound absorbing layers, or the first sound absorbing layer and the vehicle body panel. In such a part, a cushion layer for reducing vibration is inserted.

Here, the cushion layer can be set between at least one portion between the resonance layer and the first sound absorbing layer, the second sound absorbing layer, or between the first sound absorbing layer and the vehicle body panel. For example, it can be set to a plurality of parts. This cushion layer has a function to relieve vibration, and as a material, a synthetic fiber nonwoven fabric such as polyester fiber represented by PET (polyethylene terephthalate), a fiber assembly in which papers (pulp and the like) are made into a fiber, Resin foams such as urethane foam can be used. Further, either a breathable material or a non-breathable material may be used, and the thickness of the cushion layer is 0.2 to 5.0 mm, preferably 0.5 to 2.0 mm, and the density is 0.01 to 1.0 g / cm ^3. Preferably, it is set in the range of 0.01 to 0.1 g / cm ³ , respectively.

  The cushion layer and the resonance layer may be bonded using the self-bonding property of the resonance layer. In addition, as a method for adhering to the sound absorbing layer, resin powder is adhered to one side of the cushion layer and the first sound absorbing layer or the second sound absorbing layer, or an adhesive film or a net-like hot melt is laminated. Apply liquid spray paste. Alternatively, the binder fiber or binder resin in the sound absorbing layer is allowed to function as an adhesive, or a needle punch is used.

  Therefore, when the cushion layer is set on one side or both sides of the resonance layer, the cushioning property of the cushion layer has the effect of suppressing the vibration of the second sound absorbing layer serving as a mass and attenuating the radiation of the sound due to the vibration. Performance can be improved. Further, when the cushion layer is set between the first sound absorbing layer and the vehicle body panel, the vibration of the entire three-layer structure including the first sound absorbing layer, the resonance layer, and the second sound absorbing layer serving as a mass is suppressed. It has the effect of attenuating the sound radiation caused by vibration, and can improve the sound insulation performance.

  Next, in a further preferred embodiment according to the present invention, a low-breathing skin layer is attached to the surface of the second sound absorbing layer directly or via a cushion layer.

Here, as the material of the low air-permeable skin layer, felt, synthetic fiber nonwoven fabric such as polyester fiber represented by PET (polyethylene terephthalate), fiber aggregate made of paper (pulp etc.) in the form of fiber, urethane foam, etc. Resin foam can be used. The thickness of the low-air-permeable skin layer is 0.1 to 5.0 mm, the density is 0.01 to 1.0 g / cm ³ , and the air flow is 1 to 25 cm ³ / cm ² · sec (according to the measurement of the Frazier type tester). Numerical value). Moreover, as a bonding method of the low air-permeable skin layer, the bonding area of the bonding layer is 0 to 100% (0% is when only the binder fiber and binder resin of the second sound absorbing layer are used).

  Therefore, if the low air permeability skin layer is set on the surface of the second sound absorbing layer, the sound insulation performance and sound absorption performance in the middle / high frequency range (630 Hz or more) can be improved.

  As described above, the vehicle soundproofing material according to the present invention is made of a polyolefin resin foam between the first sound absorbing layer and the second sound absorbing layer, and has a self-bonding resonance layer interposed therebetween. Consisting of a laminated structure, the first and second sound absorbing layers can enhance the porous sound absorbing function and enhance the sound absorbing performance, and the sound insulating performance can be enhanced by the resonance action of the resonant layer. In addition, the sound absorption performance can be improved in a well-balanced manner.

  Furthermore, the vehicle soundproofing material according to the present invention abolishes the heavy sound insulation layer, and the resonance layer, which is a light weight material, is integrated with the sound absorbing layer by self-bonding, thus eliminating the adhesive layer. Thus, the weight can be further reduced, and the cost can be reduced by reducing the material cost and rationalizing the processing process.

  Further, according to a preferred embodiment of the soundproofing material for a vehicle according to the present invention, it is possible to improve the sound insulation performance by suppressing the vibration of the sound absorbing layer itself by attaching the cushion layer. When the low air-permeable skin layer is provided on the surface of the sound absorption layer, the sound insulation performance and sound absorption performance in the middle / high frequency range can be improved, and the sound insulation performance can be further improved.

It is sectional drawing which shows one Example which applied the soundproof material for vehicles which concerns on this invention to the insulator dash. It is sectional drawing which shows each structural member of the insulator dash shown in FIG. It is sectional drawing which shows the structural member in the modification of the insulator dash to which the soundproof material for vehicles which concerns on this invention is applied. It is sectional drawing which shows the structural member in the modification of the insulator dash to which the soundproof material for vehicles which concerns on this invention is applied. It is sectional drawing which shows the structural member in the modification of the insulator dash to which the soundproof material for vehicles which concerns on this invention is applied. It is sectional drawing which shows the structural member in the modification of the insulator dash to which the soundproof material for vehicles which concerns on this invention is applied. It is sectional drawing which shows the structural member in the modification of the insulator dash to which the soundproof material for vehicles which concerns on this invention is applied. It is sectional drawing which shows the structural member in the modification of the insulator dash to which the soundproof material for vehicles which concerns on this invention is applied. It is explanatory drawing which shows the installation location of the conventional insulator dash. It is sectional drawing which shows the structure of the conventional insulator dash. It is explanatory drawing which shows schematic structure of the sound insulation type insulator dash in the conventional insulator dash. It is explanatory drawing which shows schematic structure of the lightweight insulator dash in the conventional insulator dash.

  Hereinafter, an embodiment applied to an insulator dash mounted on the interior side of a dash panel as a vehicle soundproofing material according to the present invention will be described. Note that the gist of the present invention is as described in the scope of claims, and the contents of the embodiments described below are merely examples of the present invention.

  1 to 8 show an embodiment of the present invention. FIG. 1 is a cross-sectional view showing a configuration of an insulator dash attached to a dash panel. FIG. 2 is a cross-sectional view showing components of the insulator dash. Thru | or FIG. 8 is each sectional drawing which shows the structural member in the modification of the insulator dash which concerns on this invention.

  In FIG. 1, the dash panel 10 that partitions the engine room E and the vehicle compartment R is partitioned into a dash upper portion 10 a, a dash lower portion 10 b, and a toe board portion 10 c from the upper side, and along the indoor surface side of the dash panel 10. An insulator dash 20 is attached. Further, a floor carpet 11 is laid in a wrap shape on the surface side of the insulator dash 20 to be mounted on the toe board portion 10c, and is further mounted on the upper half of the dash upper portion 10a and the dash lower portion 10b of the dash panel 10. The upper half of the insulator dash 20 is located in the instrument panel 12. A crash pad (not shown) is attached to the instrument panel 12.

  By the way, the insulator dash 20 according to the present invention is characterized in that the sound insulation performance and the sound absorption performance can be improved in a well-balanced manner, and in particular, the product weight is reduced and the processing cost is reduced.

Next, the configuration of the insulator dash 20 will be described with reference to FIG. The insulator dash 20 is composed of a laminated structure in which a resonance layer 50 is interposed between a first sound absorbing layer 30 located on the dash panel 10 side and a second sound absorbing layer 40 located on the passenger compartment R side. ing. The configurations of the first sound absorbing layer 30 and the second sound absorbing layer 40 will be described. Both sound absorbing layers 30 and 40 are made of felt, polyester fiber typified by PET (polyethylene terephthalate), synthetic fiber nonwoven fabric such as polypropylene fiber, fiber aggregate made of paper (pulp or the like), or polypropylene, Foams formed by adding a foaming agent selected from inorganic foaming agents such as sodium bicarbonate or organic foaming agents such as azodicarbonamide in synthetic resin materials such as polyethylene and polyester, or foams such as polyurethane foams Can be used. The thicknesses of both sound absorbing layers 30 and 40 are set to 1 to 70 mm, and the density is set to 0.01 to 1.0 g / cm ³ , respectively.

Next, the resonance layer 50 interposed between the first sound absorbing layer 30 and the second sound absorbing layer 40 is made of a polyolefin resin foam and has a thickness of 0.1 to 5.0 mm, preferably 2 0.0 mm or less, the density is set to 0.02 to 1.2 g / cm ³ , and the surface density is set to 500 g / m ² or less. As for the air permeability, either a non-breathable structure or a breathable structure However, when a breathable structure is employed, the amount of ventilation is set in the range of 1 to 25 cm ³ / cm ² · sec (values measured by the Frazier type tester). That is, since the resonance layer 50 can be firmly joined and integrated with the sound absorbing layers 30 and 40 by the anchor effect by self-fusion, the conventionally required adhesive layer can be eliminated, the weight of the adhesive layer can be reduced, and adhesion can be achieved. The material cost of the layer can be reduced and the processing process can be rationalized.

  Next, as to the outline of the manufacturing method of the insulator dash 20, the sound absorbing layers 30, 40 and the resonance layer 50 are basically formed by the anchor effect by the self-fusion of the resonance layer 50 using the self-fusion property of the resonance layer 50. Although the joining and integration can be achieved, specifically, the resonance layer 50 is heated until the resonance layer 50 is softened and melted, and the first heat absorption layer 30 and the second sound absorption layer 40 subjected to the preheating treatment are pressure-bonded from both sides. To do. Alternatively, the first sound-absorbing layer 30 or a laminate of the second sound-absorbing layer 40 and the resonance layer 50 is first formed, and the other sound-absorbing layer is heat-bonded to the laminate, or the first sound-absorbing layer is formed. 30, the resonance layer 50, and the second sound absorbing layer 40 may be laminated after the integral heating process. The sound absorbing layers 30 and 40 and the resonance layer 50 are integrated by the above-described method. The contact surface of the first sound absorbing layer 30 that is the facing surface of the dash panel 10 is a fiber between the dash panel 10 and the contact surface. Although a minute gap such as a gap is formed, the soundproofness may be enhanced by intentionally forming minute irregularities and interposing more air layers.

  As described above, the insulator dash 20 having the configuration shown in FIG. 2 is provided with a sound insulation performance and a resonance layer 50 having a self-bonding property made of a polyolefin resin foam between the sound absorbing layers 30 and 40. The sound absorption performance can be improved in a well-balanced manner, and since the resonance layer 50 has self-bonding properties, the conventionally required adhesive layer can be eliminated, so that the weight of the adhesive layer can be reduced, and the material of the adhesive layer can be achieved. Costs and processing costs can be reduced, and the cost can be reduced.

3 to 8 are cross-sectional views showing modified examples of the insulator dash 20. FIGS. 3 to 6 are additionally provided with a cushion layer 60. FIG. The cushion layer 60 may be provided between the resonance layer 50 and the first sound absorption layer 30 and the second sound absorption layer 40, that is, on either one of the front and back surfaces of the resonance layer 50, or on both surfaces of the front and back surfaces. The sound absorbing layer 30 and the dash panel 10 may be disposed. The cushion layer 60 only needs to have a function to soften vibrations with a flexible sound-absorbing material. As a material, felt, polyester fiber typified by PET (polyethylene terephthalate), synthetic fiber nonwoven fabric such as polypropylene fiber, papers, etc. (Fulps etc.) formed by adding an inorganic foaming agent such as sodium bicarbonate or an organic foaming agent such as azodicarbonamide into a synthetic resin material such as polypropylene, polyethylene or polyester. A foam such as a polyurethane foam can be used, and may be either breathable or non-breathable. The thickness of the cushion layer 60 is 0.2 to 5.0 mm, preferably 0.5 to 2.0 mm, and the density is 0.01 to 1.0 g / cm ³ , preferably 0.01 to 0.1 g / cm. Each of the ^three ranges is set.

  And, as an adhesion method for adhering the cushion layer 60 to the sound absorbing layers 30 and 40, the adhesion area of the adhesive layer interposed between both layers is 0 to 100% (0% is the binder fiber in the sound absorbing layers 30 and 40, (When only binder resin is used). Specifically, resin powder is attached to any one side surface to be an adhesive layer, an adhesive film or a net-like hot melt is laminated, or a liquid spray paste is coated. Or the binder fiber in the sound absorption layers 30 and 40, the adhesive component of binder resin, or the needle punching method can also be used.

  In this manner, by providing the cushion layer 60 having a function of reducing vibration, for example, the cushion layer 60 is set on one surface or both surfaces of the resonance layer 50 as shown in FIGS. In this case, the cushioning property of the cushion layer 60 has an effect of suppressing the vibration of the second sound absorbing layer 40 itself serving as a mass and attenuating sound emission due to the vibration. That is, it has an attendant effect of improving the sound insulation performance.

  On the other hand, as shown in FIG. 6, when the cushion layer 60 is disposed between the dash panel 10 and the first sound absorbing layer 30, the cushioning property of the cushion layer 60 causes the first sound absorbing layer 30 to be a mass. The vibration of the entire three-layer structure including the resonance layer 50 and the second sound absorbing layer 40 can be suppressed, and the effect of attenuating the sound radiation caused by the vibration, that is, the sound insulation performance can be improved. Further, as for the method of bonding the resonance layer 50 and the cushion layer 60, the self-bonding property of the resonance layer 50 can be used to join and integrate with the cushion layer 60.

  Next, FIG. 7 and FIG. 8 show a further modification of the insulator dash 20 according to the present invention. As shown in FIG. 7, between the first sound absorbing layer 30 and the second sound absorbing layer 40, FIG. By arranging the resonance layer 50 and attaching the low-breathing skin layer 70 to the surface of the second sound absorbing layer 40 in addition to the effect of improving the sound insulation performance and sound absorbing performance in a balanced manner while being lightweight, Sound insulation performance and sound absorption performance in a high frequency range (630 Hz or more) can be improved.

As the material of the low air-permeable skin layer 70, felt, polyester fiber typified by PET (polyethylene terephthalate), synthetic fiber nonwoven fabric such as polypropylene fiber, fiber aggregate made of paper (pulp, etc.), and various foams The low-aeration skin layer 70 has a thickness of 0.1 to 5.0 mm, a density of 0.01 to 1.0 g / cm ³ , and a ventilation rate of 1 to 25 cm ³ / cm ² · sec (fragile test Each value is set within the range of numerical values measured by the machine. And the adhesion method of this low air-permeable skin layer 70 and the 2nd sound absorption layer 40 is 0-100% (0% is the binder in the 2nd sound absorption layer 40) of the adhesion layer of the contact bonding layer inserted between both layers. (When using only fiber and binder resin), resin powder is sprayed on either side, adhesive film, reticulated hot melt is laminated, or liquid spray paste is coated Yes. Alternatively, the binder fibers in the second sound absorbing layer 40 and an adhesive component of the binder resin may be used, or may be integrated by a needle punching method.

  Further, as shown in FIG. 8, a cushion layer 60 may be interposed between the second sound absorbing layer 40 and the low air permeability skin layer 70. That is, if the cushion layer 60 is interposed between the second sound absorbing layer 40 and the low air permeability skin layer 70, the effect of suppressing the vibration of the low air permeability skin layer 70 serving as a mass and attenuating sound radiation due to the vibration, That is, sound insulation can be improved. Although not shown, in addition to the laminated structure shown in FIGS. 7 and 8, the cushion layer 60 is disposed on one surface or both surfaces of the resonance layer 50 or between the first sound absorbing layer 30 and the dash panel 10. It can also be inserted.

  In the above-described embodiment, the present invention is applied to the insulator dash 20 attached to the vehicle interior side of the dash panel 10, but the engine room, luggage room, or trunk room as well as the roof trim and floor carpet installed in the vehicle interior. It can be applied to various soundproofing materials that are installed inside. The soundproofing material represented by the insulator dash 20 has a basic structure including a three-layer structure including a first sound absorbing layer 30, a second sound absorbing layer 40, and a resonance layer 50 interposed therebetween. Various variations can be imparted by providing a cushion layer 60 that softens vibrations and a low-breathing skin layer 70 that improves sound insulation performance and sound absorption performance in the middle and high frequency ranges in this basic structure.

DESCRIPTION OF SYMBOLS 10 Dash panel 20 Insulator dash 30 1st sound absorption layer 40 2nd sound absorption layer 50 Resonance layer 60 Cushion layer 70 Low air permeability skin layer

Claims (3)

A vehicle soundproofing material (20) mounted on the interior surface side of the vehicle body panel (10), the first sound absorbing layer (30) positioned on the vehicle body panel (10) side, and positioned on the inside of the vehicle interior (R) In the vehicle soundproofing material (20) composed of a laminated structure in which a resonance layer (50) having a resonance function is interposed between the second sound absorption layer (40) and
The resonance layer (50) is made of a polyolefin-based resin foam having self-bonding property, and is self-bonding when the resonance layer (50) is heated and melted. A soundproofing material for vehicles, wherein the resonance layer (50) is joined and integrated by an anchor effect.   At least one part between the resonance layer (50) and the first and second sound absorbing layers (30, 40) or between the first sound absorbing layer (30) and the vehicle body panel (10) The vehicle soundproofing material according to claim 1, further comprising a cushion layer (60) for reducing vibration.   The low air-permeable skin layer (70) is affixed on the surface of the said 2nd sound absorption layer (40) directly or through the cushion layer (60), The Claim 1 or 2 characterized by the above-mentioned. Soundproofing material for vehicles.

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