JP2010132024A - Sound-proofing material for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain light weight and enhance sound-proofing performance by enhancing sound-shielding performance and sound-absorption performance at sufficient balance in a sound-proofing material for a vehicle attached to an indoor surface side of a vehicle body panel. <P>SOLUTION: An insulator dash 20 mounted to a cabin inner surface side of the vehicle body panel 10 is constituted by interposing an intermediate layer 50 constituted by a light weight material between a first sound-absorption layer 30 positioned at the vehicle body panel 10 side and a second sound-absorption layer 40 positioned at a cabin R side. Further, bending rigidity of the intermediate layer 50 is set to 0.02 N*cm<SP>2</SP>or more and thickness of the second-absorption layer 40 relative to the first sound-absorption layer 30 is set to the optimum thickness. Thereby, light weight is attained and the sound-shielding performance and sound-absorption performance are enhanced at sufficient balance. <P>COPYRIGHT: (C)2010,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 can achieve excellent soundproofing performance by improving sound insulation and sound absorption performance in a balanced manner while achieving weight reduction. .

  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.

  And as a material of the sound absorbing layer 3 in the insulator dash 2, a material capable of obtaining a porous sound absorbing function such as felt, non-woven mat, or foam can be used. As the skin layer 4, the sound insulating type shown in FIG. When applied to the insulator dash 2, a sound insulating material 4A made of a high-density material such as a recycled rubber sheet or a recycled PVC sheet is used. Moreover, when applying to the ventilation type | mold insulator dash 2A of FIG.11 (b), the lightweight high-density ventilation layer 4B which has air permeability, such as a nonwoven fabric mat, is used. The configuration of the conventional example of the sound insulation type insulator dash 2 is described in Patent Document 1, and the configuration of the conventional example of the ventilation type insulator dash 2A is described in Patent Document 2.

Japanese Utility Model Publication No. 7-5966

Special Table 2002-505209

  Thus, conventionally, for example, as shown in FIG. 11 (a), in the sound insulation type insulator dash 2, a heavy material such as a recycled rubber sheet or a recycled PVC sheet is used as the sound insulating material 4A. However, this increases the weight of the product and reduces the fuel efficiency and installation workability. Furthermore, in terms of sound absorption performance, the sound absorption effect of high frequency level noise is not sufficient, and there is a point that should be improved in sound absorption performance compared to sound insulation performance, and there is a problem that satisfactory sound insulation performance cannot be obtained. Yes.

  On the other hand, the breathable insulator dash 2A shown in FIG. 11 (b) uses a high-density breathable layer 4B such as a non-woven mat instead of the heavy sound insulation material 4A. When forming 4, the fiber used is mainly recycled products, so the specifications of the fiber differ depending on the season, the resistance to airflow tends to fluctuate due to variations in thickness, etc., and it is difficult to achieve uniform sound absorption performance . In addition, the filaments are likely to fall off due to long-term use, leading to a decrease in sound absorption performance, and not preferable from the environmental aspect of the passenger compartment. In this ventilation type insulator dash 2A, the sound insulation performance tends to be improved as compared with the sound absorption performance. Furthermore, as a method of reducing the noise level in the low frequency range, it has been dealt with by increasing the weight per unit area of the sound absorbing layer 3, but in this case, the material cost and the molding processing cost will rise, leading to an increase in cost. At the same time, there is a problem that the molding cycle is prolonged and productivity is greatly reduced.

  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 achieves a good balance between sound insulation performance and sound absorption performance while achieving weight reduction. An object of the present invention is to provide a vehicle soundproofing material that can be improved and can provide excellent soundproofing performance.

In order to solve the above-described problems, the present invention provides a vehicle soundproofing material that is mounted on the interior surface side of a vehicle body panel, and includes a first sound absorbing layer located on the vehicle body panel side and a second sound insulation layer located on the indoor side. In the vehicle soundproofing material constituted by a laminated structure having an intermediate layer interposed between the sound absorbing layer and the sound absorbing layer, the bending rigidity of the intermediate layer is set to 0.02 N · cm ² or more, and the second The thickness of the sound absorbing layer is set to 0.2 to 5.0 times the thickness of the first sound absorbing layer.

  Here, the installation location of the 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. Product forms include insulator dashes, roof trims, soundproof parts in floor carpets, luggage trims, trunk trims, and the like.

  The basic structure of the soundproofing material according to the present invention is a laminated structure having a three-layer structure in which an intermediate layer is interposed between two sound-absorbing layers, and contacts the vehicle body panel of the two sound-absorbing layers. The sound absorbing layer on the side is separated from the first sound absorbing layer, and the sound absorbing layer laminated on the indoor side through the intermediate layer with respect to the first sound absorbing layer is separated from the second sound absorbing layer for convenience.

First, as a material of the first sound absorbing layer, felt, synthetic fiber nonwoven fabric such as PET (polyester) fiber, fiber aggregate made of paper (pulp or the like), foamed sheet such as urethane foam, or the like can be used. . The thickness of the first sound absorbing layer is set to ² to 100 mm, and the surface density is set to 100 to 3000 g / m ² .

Next, the material of the second sound absorbing layer can be the same as that of the first sound absorbing layer, and felt, synthetic fiber nonwoven fabrics such as PET (polyester) fibers, and papers (pulp, etc.) are made fibrous. Foam sheets such as fiber aggregates and urethane foam can be used. The thickness of the second sound absorbing layer is adjusted to 0.2 to 5.0 times the thickness of the first sound absorbing layer, and preferably in the range of 0.8 to 1.2 times. Further, the surface density of the second sound absorbing layer is 100 to 3000 g / m ² like the first sound absorbing layer.

Next, as a material of the intermediate layer interposed between the first sound absorbing layer and the second sound absorbing layer, a non-breathable film, a non-breathable sheet, a low breathability (air flow rate: 15 cm ³ / cm ² · sec or less) or a composite (a fiber molded body obtained by laminating a foam), or a rigid material (such as a dumper, corrugated cardboard or gypsum board). Further, these materials may be subjected to surface treatment (surface treatment, embossing), or a honeycomb structure material may be used. The intermediate layer has a thickness of 0.5 to 10.0 mm, preferably 3 to 5 mm, and a surface density of 10 to 500 g / m ² , preferably 20 to 120 g / m ^2. good. In particular, the important point as the physical properties of the intermediate layer is that the bending rigidity (when the width is 25 mm) is set to 0.02 N · cm ² or more.

  Furthermore, the adhesion method of the first sound absorbing layer, the second sound absorbing layer and the intermediate layer is to spray resin powder on one side surface of the intermediate layer and the first sound absorbing layer or the second sound absorbing layer, Laminate the adhesive film, reticulated hot melt, or coat the liquid spray paste. Alternatively, the binder fiber or the binder resin in the sound absorbing layer functions as an adhesive. Therefore, the adhesion area of the adhesive layer interposed between the sound absorbing layer and the intermediate layer is 0 to 100%, preferably 50% or less (0% is when using only the binder fiber or binder resin in the sound absorbing layer). It is set. In addition, the laminated form of the soundproofing material for vehicles is arranged in such a manner that an intermediate layer is disposed between the raw sheet of the first sound absorbing layer and the second sound absorbing layer heat-softened in the mold and, if desired, adhered between the layers. By integrating the press with the layer interposed, the vehicle soundproofing material can be formed into a required shape in accordance with the interior shape of the vehicle body panel. Further, since there is a fine air gap on the side surface of the vehicle body panel of the first sound absorbing layer, a fine air layer exists between the panel surface and the opposing surface of the second sound absorbing layer. It is also possible to consciously provide minute unevenness on the body panel surface of the vehicle body and interpose an air layer of more space between them.

As apparent from the above configuration, the vehicle soundproofing material according to the present invention is a laminated structure in which an intermediate layer is interposed between the first sound absorbing layer and the second sound absorbing layer. By setting the bending rigidity to 0.02 N · cm ² or more, it is possible to significantly improve transmission loss even with lightweight materials, and to improve sound insulation and sound absorption performance in a well-balanced manner while achieving weight reduction. It becomes possible.

  Further, considering the tendency that the sound absorbing performance is deteriorated if the thickness of the second sound absorbing layer is too thin, and the sound insulating performance is deteriorated if the thickness is too thick, the thickness of the second sound absorbing layer is changed to the thickness of the first sound absorbing layer. Therefore, the sound insulation performance and sound absorption performance can be improved in a well-balanced manner. Further, for the bonding method between the sound absorbing layer and the intermediate layer, the bonding area of the adhesive layer interposed between the sound absorbing layer and the intermediate layer is set to 0 to 100%, preferably 50% or less. For example, in the case of resin powder, even if the powder adhesion area is set to a low occupancy area such as 10 to 20%, the adhesive strength can be ensured by the binder fiber inside the sound absorbing layer or the binder resin. In addition to being the same as the example, the low-frequency sound insulation performance is improved and the sound absorption performance is improved over the entire area. Therefore, if the binder fiber and the binder resin inside the sound absorbing layer are used, the adhesive layer area can be reduced and the cost can be reduced, while the sound insulation performance and sound absorbing performance can be improved.

  Next, in a preferred embodiment of the vehicle soundproofing material according to the present invention, at least one of the intermediate 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 intermediate 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. As a material, felt, synthetic fiber nonwoven fabric such as PET (polyester) fiber, fiber aggregate made of paper (pulp or the like) in a fibrous form, urethane foam, etc. A foam sheet or the like can be used, and either a breathable material or a non-breathable material may be used. The cushion layer has a thickness of 0.2 to 5.0 mm, preferably 0.5 to 2.0 mm, and a density of 0.01 to 1.0 g / cm ³ , preferably 0.01 to 0.1 g / cm ^3. Each of these ranges is set. As a method of bonding the cushion layer, the bonding area of the adhesive layer interposed between the two layers is set to 0 to 100% (0% is when using only the binder fiber and binder resin in the sound absorbing layer), and the cushion Resin powder is sprayed on one side surface of the layer and the first sound absorbing layer or the second sound absorbing layer, an adhesive film or a net-like hot melt is laminated, or a liquid spray paste is coated. Alternatively, the binder fiber or the binder resin in the sound absorbing layer is allowed to function as an adhesive, or a needle punch is used. The same applies to the bonding method between the cushion layer and the intermediate layer, and resin powder, adhesive film, reticulated hot melt, liquid spray paste, or the like is used, or the binder fiber or binder resin in the cushion layer is used.

  Therefore, when the cushion layer is set on one side or both sides of the intermediate 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 intermediate layer, and the second sound absorbing layer, which are masses, 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 of the vehicle soundproofing material according to the present invention, a low-breathing skin layer is adhered to the surface of the second sound absorbing layer directly or via a cushion layer. And

Here, as the material of the low air permeability skin layer, felt, synthetic fiber nonwoven fabric such as PET (polyester) fiber, fiber aggregate made of paper (pulp or the like) in the form of fiber, foam sheet such as urethane foam, etc. 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-permeable skin layer is set on the surface of the second sound absorbing layer, the sound insulation and sound absorbing 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 composed of a laminated structure in which an intermediate layer is interposed between the first sound absorbing layer and the second sound absorbing layer, and an intermediate layer using a lightweight material. Is set to 0.02 N · cm ² or more, and the thickness of the second sound absorbing layer located on the indoor side is 0.2 to 5.0 of the thickness of the first sound absorbing layer located on the vehicle body panel side. By setting to double, the sound insulation performance and sound absorption performance can be improved in a balanced manner, and the weight reduction can be achieved and the sound insulation performance can be improved in a total sense.

  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 absorbing layer, it is possible to improve the sound insulation and sound absorbing performance in the middle / high frequency range, and to improve the soundproof performance.

  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 configured such that the product weight is significantly reduced in order to improve fuel efficiency and mounting workability, and further, sufficient soundproofing characteristics are provided even if the weight is reduced. ing.

  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 an intermediate 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 configuration 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.

More specifically, the sound absorbing layers 30 and 40 may be made of either breathable or non-breathable material. And the thickness of the 1st sound absorption layer 30 is 2-100 mm, and the surface density is each set to 100-3000 g / m < ² >. On the other hand, the thickness of the second sound absorbing layer 40 is adjusted to 0.2 to 5.0 times, preferably 0.8 to 1.2 times the thickness of the first sound absorbing layer 30, and the surface density is the first. Similarly to the sound absorbing layer 30, the thickness is set to 100 to 3000 g / m ² . Here, if the second sound absorbing layer 40 is too thin, the sound absorbing performance is deteriorated, and if the thickness is too thick, the sound insulating performance is deteriorated. Therefore, the sound insulating performance and the sound absorbing performance are set in the above-described range. The aim is to improve the balance in a balanced manner.

Further, the intermediate layer 50 interposed between the first sound absorbing layer 30 and the second sound absorbing layer 40 is made of a lightweight material to reduce weight and increase bending rigidity, thereby reducing transmission loss. It is characterized by significant improvement. As the material of the intermediate layer 50, a non-venting or low-venting material can be used. As the non-breathable material, a resin film or a resin sheet can be used, and a low-breathing foam (15 cm ³ / cm ² · sec or less (numerical value measured by a Frazier type testing machine)) or a composite (in a fiber molded body) Foam laminate) or rigid materials (dumpler, corrugated board, gypsum board, etc.), surface treatment (surface treatment, embossing) is applied to the above materials, or honeycomb structural materials are used. You may do it.

The thickness of the intermediate layer 50 is 0.5 to 10.0 mm, preferably 3 to 5 mm, and the surface density is 10 to 500 g / m ² , preferably 20 to 120 g / m ² , especially bending rigidity (when the width is 25 mm). ) Is set to a level of 0.02 N · cm ² or more (in the conventional film, 0.01 N · cm ² or less).

  Next, as an adhesion method for adhering the intermediate layer 50 to the first sound absorption layer 30 and the second sound absorption layer 40, the adhesion area of an adhesion layer (not shown) interposed between both layers is 0 to 100%. Preferably, it is set to 50% or less (0% is the case where only the binder fiber and binder resin in the sound absorbing layers 30 and 40 are used). For example, in order to bond the intermediate layer 50 and the first sound absorbing layer 30, a resin powder is sprayed on one of the opposing surfaces, an adhesive film, a lamellar hot melt is laminated, or a liquid spray paste is applied. An adhesive layer (not shown) is formed by the coating method. In addition to this, an adhesive component such as a binder fiber or a binder resin in the first sound absorbing layer 30 can also function. The bonding method for the second sound absorbing layer 40 with respect to the intermediate layer 50 is also the same. More specifically, for example, in the case of resin powder, even if the powder adhesion area is set to a low occupancy area such as 10 to 20%, the adhesive strength can be secured with the binder fibers in the sound absorbing layers 30 and 40 or the binder resin. Therefore, the adhesive strength is not different from that of the conventional example, and the sound insulation performance in the low range is improved and the sound absorption performance is improved over the entire area. Therefore, if the binder fibers and the binder resin in the sound absorbing layers 30 and 40 are used, the adhesive layer area can be reduced and the cost can be reduced, while the sound insulation performance and sound absorption performance can be improved.

  The insulator dash 20 is formed by a press die with the intermediate layer 50 sandwiched between the original fabric mats of the first sound absorbing layer 30 and the second sound absorbing layer 40 separately heated by a heater device. 20 is formed by press-integrating into the product shape, but the contact surface of the first sound absorbing layer 30 which is the opposing surface of the dash panel 10 is formed with a minute gap such as a fiber gap between the dash panel 10. However, soundproof performance 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 configured such that the intermediate layer 50 is made of a lightweight material and the transmission loss is achieved while the weight is reduced by setting the bending rigidity to 0.02 N · cm ² or more. The sound insulation performance can be improved significantly, and the sound insulation performance and sound absorption performance can be improved in a well-balanced manner by setting the thickness of the second sound absorption layer 40 within the optimum range. Have.

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 intermediate layer 50 and the first sound absorbing layer 30 and the second sound absorbing layer 40, that is, either one of the front and back surfaces of the intermediate layer 50, or both 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.

  As an adhesion method for adhering the cushion layer 60 to the sound absorbing layers 30 and 40 or the intermediate layer 50, the adhesion area of the adhesive layer interposed between both layers is 0 to 100% (0% is the sound absorbing layers 30 and 40). In the case of using only the binder fiber and binder resin in the middle). 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 addition to the method of adhering the intermediate layer 50 and the cushion layer 60, in addition to attaching resin powder to one of the side surfaces, laminating an adhesive film or a reticulated hot melt, or coating a liquid spray paste. Thus, the binder fiber and the binder resin in the cushion layer 60 can be used as a connection medium.

  In this way, 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 intermediate layer 50 as shown in FIGS. 3 to 5. 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. In addition, the vibration of the entire three-layer structure including the intermediate 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.

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. In addition to the effect of arranging the intermediate layer 50 and improving the sound insulation performance and sound absorption performance in a well-balanced manner while being lightweight, by attaching the low-breathing skin layer 70 to the surface of the second sound absorption layer 40, Sound insulation 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 or both surfaces of the intermediate layer 50 or between the first sound absorbing layer 30 and the dash panel 10. It can also be inserted.

  In the embodiment described above, the present invention is applied to the insulator dash 20 attached to the vehicle interior side of the dash panel 10. However, the engine room, the luggage room, or the 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. In addition, 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 an intermediate 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 / high frequency range in this basic structure.

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, and a ventilation type | mold insulator dash.

Explanation of symbols

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

Claims (3)

A vehicle soundproof material (20) mounted on the interior surface side of the vehicle body panel (10), the first sound absorbing layer (30) located on the vehicle body panel (10) side and the second sound insulation layer (30) located on the indoor side. In the vehicle soundproofing material (20) constituted by a laminated structure in which the intermediate layer (50) is interposed between the sound absorbing layer (40) and
The bending rigidity of the intermediate layer (50) is set to 0.02 N · cm ² or more, and the thickness of the second sound absorbing layer (40) is 0.2 to the thickness of the first sound absorbing layer (30). A soundproofing material for vehicles characterized by being set to 5.0 times.   At least one part between the intermediate 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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