WO2021182466A1 - Matériau d'absorption acoustique, élément d'amélioration de propriété d'absorption acoustique et élément de véhicule - Google Patents

Matériau d'absorption acoustique, élément d'amélioration de propriété d'absorption acoustique et élément de véhicule Download PDF

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Publication number
WO2021182466A1
WO2021182466A1 PCT/JP2021/009275 JP2021009275W WO2021182466A1 WO 2021182466 A1 WO2021182466 A1 WO 2021182466A1 JP 2021009275 W JP2021009275 W JP 2021009275W WO 2021182466 A1 WO2021182466 A1 WO 2021182466A1
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WIPO (PCT)
Prior art keywords
base material
material layer
sound absorbing
layer
sound
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Application number
PCT/JP2021/009275
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English (en)
Japanese (ja)
Inventor
慧 高安
亜唯 横倉
智彦 小竹
Original Assignee
昭和電工マテリアルズ株式会社
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Priority to JP2022507217A priority Critical patent/JPWO2021182466A1/ja
Publication of WO2021182466A1 publication Critical patent/WO2021182466A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/593—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives to layered webs
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches

Definitions

  • the present invention relates to a sound absorbing material, a sound absorbing property improving member, and a vehicle member.
  • a single-layer sound-absorbing structure made of melt-blown non-woven fabric is known (for example, Patent Document 1).
  • the sound absorbing characteristics are insufficient, especially in the low frequency region.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sound absorbing material having excellent sound absorbing characteristics in a low frequency region. It is also an object of the present invention to provide a sound absorbing property improving member and a vehicle member.
  • the sound absorbing material described below includes a hard layer (resin film) having a so-called weight function and a soft layer (base material layer having communication holes) having a spring function from the sound incident side. It is considered that sound can be suitably absorbed by the combination of the layers.
  • the inventors have found that in such a sound absorbing material, the frequency dependence of the sound absorbing characteristic can be adjusted by forming the soft layer into a two-layer structure having different densities.
  • One aspect of the present invention includes a resin film, a first base material layer having communication holes, and a second base material layer having communication holes in this order, and the density of the first base material layer is the second group.
  • sound absorbing materials which are higher than the density of the material layer.
  • One aspect of the present invention includes a first base material layer having communication holes and a second base material layer having communication holes in this order, and the density of the first base material layer is the density of the second base material layer.
  • the present invention relates to a sound absorbing property improving member which is used so that the first base material layer side is in the incident direction of sound.
  • One aspect of the present invention relates to a vehicle member provided with the above sound absorbing material.
  • the ventilation resistance of the first base material layer may be higher than the ventilation resistance of the second base material layer.
  • the first base material layer and the second base material layer may be a resin foam or a non-woven fabric.
  • the thickness of the first base material layer may be thinner than the thickness of the second base material layer.
  • the resin film may be composed of polyolefin, polyester or polyamide.
  • the sound absorbing material may have a metal vapor deposition layer on at least one surface of the resin film.
  • the sound absorbing material may further include an adhesive layer in at least one of the resin film and the first base material layer, and the first base material layer and the second base material layer.
  • the density of the first base material layer may be 0.015 ⁇ 0.45g / cm 3, the density of the second substrate layer, a 0.005 ⁇ 0.20g / cm 3 good.
  • the aeration resistance of the first base material layer is 0.02 to 0.7 kPa ⁇ s / m
  • the aeration resistance of the second base material layer is 0.003 to 0.45 kPa ⁇ s / m. It may be there.
  • the thickness of the sound absorbing material may be 1 to 100 mm.
  • the present invention it is possible to provide a sound absorbing material having excellent sound absorbing characteristics in a low frequency region. Further, according to the present invention, it is possible to provide a sound absorbing property improving member and a vehicle member.
  • FIG. 1 is a schematic cross-sectional view of the sound absorbing material.
  • FIG. 2 is a diagram showing the vertical incident sound absorption coefficient of Example 1-1.
  • FIG. 3 is a diagram showing the vertical incident sound absorption coefficient of Comparative Example 1.
  • FIG. 4 is a diagram showing the vertical incident sound absorption coefficient of Example 2-1.
  • FIG. 5 is a diagram showing the vertical incident sound absorption coefficient of Comparative Example 2.
  • FIG. 1 is a schematic cross-sectional view of the sound absorbing material.
  • the sound absorbing material 10 includes a resin film 1, a first base material layer 2 having communication holes as a base material layer, and a second base material layer 3 having communication holes in this order.
  • the sound (sound energy) incident from the resin film side is dissipated as heat energy when passing through the sound absorbing material. As a result, sound attenuation is observed.
  • the base material layer having communication holes examples include a resin foam, a non-woven fabric, a polymer porous body, and a porous ceramic.
  • the base material layer may be a resin foam or a non-woven fabric, or may be a non-woven fabric.
  • the first base material layer and the second base material layer may be made of the same material or may be made of different materials.
  • the material of the resin foam examples include polyethylene resin, polypropylene resin, polyurethane resin, polyester resin, acrylic resin, polystyrene resin, melamine resin, silicone resin, natural rubber, synthetic rubber and the like. From the viewpoint of heat resistance, flame retardancy, etc., the material of the resin foam may be melamine resin.
  • Examples of the fibers constituting the non-woven fabric include organic fibers and inorganic fibers.
  • Examples of the organic fiber include polyolefin fibers such as polyethylene (low density or high density), polypropylene, copolymerized polyethylene, and copolymerized polypropylene, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate.
  • Such as polyester fiber, polyamide fiber, acrylic fiber, nylon fiber, rayon fiber, natural fiber such as wool and the like can be mentioned.
  • examples of the inorganic fiber include glass fiber, metal fiber, ceramic fiber, carbon fiber and the like.
  • the fibers constituting the non-woven fabric may contain one kind or two or more kinds of these.
  • the thickness of the base material layer can be 0.1 to 50 mm, 0.5 to 20 mm, or 2.0 to 10 mm from the viewpoint of excellent sound absorption characteristics in the low frequency region. good.
  • the first base material layer and the second base material layer may have the same thickness or may have different thicknesses. From the viewpoint of excellent sound absorption characteristics in the low frequency region, the thickness of the first base material layer (base material layer on the incident side of sound) may be thinner than the thickness of the second base material layer.
  • the density of the first base material layer is higher than the density of the second base material layer.
  • the density of the first base material layer can be 0.015 to 0.45 g / cm 3 from the viewpoint of excellent sound absorption characteristics in the low frequency region. It may be 020 to 0.40 g / cm 3 or 0.025 to 0.35 g / cm 3.
  • the density of the second base material layer may be 0.005 to 0.20 g / cm 3 from the viewpoint of excellent sound absorption characteristics in the low frequency region. It may be 0.007 to 0.16 g / cm 3 or 0.009 to 0.12 g / cm 3 .
  • the ratio of the density of the first base material layer to the density of the second base material layer is 1.5 from the viewpoint of excellent sound absorption characteristics in the low frequency region. It can be ⁇ 50, and it can be 2-35.
  • the ventilation resistance of the first base material layer may be higher than the ventilation resistance of the second base material layer.
  • the ventilation resistance of the first base material layer can be 0.02 to 0.7 kPa ⁇ s / m from the viewpoint of being superior in sound absorption characteristics in the low frequency region. It may be 0.03 to 0.6 kPa ⁇ s / m, or 0.04 to 0.5 kPa ⁇ s / m.
  • the ventilation resistance of the second base material layer is set to 0.003 to 0.45 kPa ⁇ s / m from the viewpoint of being superior in sound absorption characteristics in the low frequency region. It may be 0.004 to 0.3 kPa ⁇ s / m, or 0.005 to 0.25 kPa ⁇ s / m.
  • the ratio of the ventilation resistance of the first base material layer to the ventilation resistance of the second base material layer is from the viewpoint of being superior in sound absorption characteristics in the low frequency region. , 1.1 to 100, and 1.1 to 80.
  • the ventilation resistance of the base material layer is measured by a breathability tester (KES-F8) manufactured by Kato Tech Co., Ltd.
  • the sound absorbing material may further include another base material layer having communication holes from the viewpoint of excellent sound absorbing characteristics in the low frequency region. That is, the sound absorbing material includes, in addition to the first base material layer having communication holes and the second base material layer having communication holes, the third base material layer having communication holes, the fourth base material layer having communication holes, and the like. May be provided.
  • Each base material layer may be composed of the same material or may be composed of different materials.
  • the resin constituting the resin film examples include polyolefin resins such as polyethylene (low density or high density), polypropylene (stretched or unstretched), copolymerized polyethylene, and copolymerized polypropylene, polyethylene terephthalate, polytrimethylene terephthalate, and poly.
  • Polyester resins such as butylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate, fluororesins such as PTFE, FEP, and PFA, polyimide resins, polyamide resins, aramid resins, vinyl chloride resins, acrylic resins, and polycarbonates.
  • the resin film is a film that does not have communication holes.
  • the thickness of the resin film can be 0.5 to 500 ⁇ m, 5 to 250 ⁇ m, or 10 to 100 ⁇ m from the viewpoint of excellent sound absorption characteristics in the low frequency region. Further, from the viewpoint of excellent sound absorption characteristics in the low frequency region, the ratio of the thickness of the base material layer to the thickness of the resin film (thickness of the base material layer / thickness of the resin film) may be 1 to 20000. It can be 10 to 10000 or 100 to 1000.
  • the resin film may be provided with a metal vapor deposition layer on its surface from the viewpoint of improving the sound absorption effect by adjusting the film characteristics and imparting the heat ray reflection function. That is, the sound absorbing material may further include a metal vapor deposition layer on the surface of the resin film.
  • the metal vapor deposition layer can be formed by forming a metal such as aluminum, copper, zinc, zinc alloy, or silver by physical vapor deposition such as vacuum deposition or chemical vapor deposition.
  • the metal vapor deposition layer may be provided on both sides of the resin film, or may be provided on one side.
  • the resin film may be a perforated film from the viewpoint of improving the sound absorbing effect in the low frequency region and adjusting the sound absorbing frequency peak.
  • the perforated film may have holes arranged in a grid pattern or a diamond shape. From the viewpoint of excellent sound absorption characteristics in the low frequency region, the hole may have a circular shape having a diameter of 0.1 to 50.0 mm, a circular shape of 0.2 to 10.0 mm, and 0.3. It may have a circular shape of up to 5.0 mm.
  • the shape of the hole may be circular, elliptical, rectangular, polygonal or the like.
  • the sound absorbing material may further include an adhesive layer between the above layers.
  • the sound absorbing material may have an adhesive layer at least between the resin film and the first base material layer, and between the first base material layer and the second base material layer.
  • the adhesive layer vinyl acetate resin, polyolefin resin, ethylene / vinyl acetate copolymer resin, isobutene / maleic anhydride copolymer resin, acrylic copolymer resin, acrylic monomer, acrylic oligomer, styrene / butadiene rubber, vinyl chloride resin, Layers containing adhesive components such as chloroprene rubber, nitrile rubber, urethane resin, silylated urethane resin, epoxy resin, modified epoxy resin, polyethylene resin, ionomer resin, silicone resin, modified silicone resin, water glass, silicate, etc., or paper, cloth , A laminate having layers containing these adhesive components on both sides of a support composed of a resin film, a metal tape, or the like (for example, double-sided tape). Each adhesive layer may be composed of the same material or may be composed of different materials.
  • the thickness of the adhesive layer is not particularly limited, but may be 0.01 to 500 ⁇ m, and may be 1 to 250 ⁇ m. Each adhesive layer may have the same thickness or may have different thicknesses.
  • the thickness of the sound absorbing material can be 1 to 100 mm, may be 2 to 50 mm, or 5 to 30 mm from the viewpoint of expressing sound absorbing characteristics, workability of the material, space saving, and the like. good.
  • the average vertically incident sound absorption coefficient of the sound absorbing material at 500 to 1000 Hz which is measured in accordance with JIS A 1405-1, can be 0.4 or more, and may be 0.5 or more.
  • the sound absorbing material can be produced by laminating each layer.
  • the sound absorbing material may be used in a state where the respective layers are adhered by providing the adhesive layer as described above, but the sound absorbing material may be used without the respective layers being adhered. Further, the adhesive layer may be provided only in a part of the layers.
  • the laminate constituting the sound absorbing material may be used in a state of being housed in the housing.
  • the portion of the base material layer provided in the sound absorbing material can be used as a sound absorbing property improving member.
  • the sound absorbing property improving member includes a first base material layer having communication holes and a second base material layer having communication holes in this order. The sound absorbing property improving member is used so that the side of the first base material layer is the incident direction of sound, and the density of the first base material layer is higher than the density of the second base material layer.
  • the sound absorption improving member is provided on the surface of the substrate for which sound absorption characteristics are to be improved (sound absorption is desired to be imparted) and where sound is emitted.
  • the sound absorption improving member By providing the sound absorption improving member on the substrate so that the substrate and the first substrate layer face each other, the sound absorption characteristics of the substrate can be improved. That is, a sound absorbing structure can be obtained by providing the sound absorbing property improving member on the substrate whose sound absorbing characteristics are desired to be improved so that the substrate and the first base material layer face each other.
  • the obtained sound absorbing structure includes a substrate and a sound absorbing property improving member, and the substrate, the first base material layer, and the second base material layer are provided in this order. With this configuration, a configuration similar to that of the sound absorbing material (a hard layer having a weight function and a soft layer having a spring function from the sound incident side) is realized.
  • a method of providing the sound absorbing property improving member on the substrate a method of bonding the substrate and the sound absorbing property improving member by the above-mentioned adhesive layer, or using a housing or the like with the sound absorbing property improving member placed on the substrate. Examples thereof include a method of fixing the sound absorbing property improving member, but the method is not limited to these methods.
  • the above description of the sound absorbing material can be referred to as appropriate.
  • the substrate include a resin plate, a rubber plate, a fiber plate, a metal plate, a ceramic plate, a glass plate and the like.
  • specific examples of these materials include polyethylene (low density or high density), polyethylene, copolymerized polyethylene, polyolefin resins such as copolymerized polypropylene, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate.
  • Polyethylene resin such as polybutylene naphthalate, fluorine resin such as PTFE, FEP, PFA, polyurethane resin, polyimide resin, polyamide resin, aramid resin, vinyl chloride resin, acrylic resin, polycarbonate resin, Resins such as polyphenylene sulfide resin, polyvinyl alcohol resin, polystyrene resin, polyacrylonitrile resin, ethylene / vinyl acetate resin; natural rubber, styrene / butadiene rubber, isoprene rubber, butadiene rubber, chloroprene rubber, acrylonitrile butadiene rubber, Rubbers such as butyl rubber, ethylene propylene rubber, ethylene propylene diene rubber, urethane rubber, silicone rubber, fluorine rubber, acrylic rubber, epichlorohydrin rubber, chlorosulfonated polyethylene, chlorinated polyethylene; polyethylene (low density or high density), polypropylene , Polyethylene fibers such as copolymerized poly
  • the sound absorbing material and the sound absorbing property improving member are excellent in sound absorbing characteristics in a low frequency region. Therefore, the sound absorbing material and the sound absorbing property improving member can be suitably used in applications such as automobiles, railroad vehicles, aircraft, ships, buildings such as houses, electronic devices, and precision machines.
  • the low frequency region referred to here can be a region having a frequency of 1000 Hz or less, and the sound absorbing material has excellent sound absorbing characteristics in a frequency region of 250 to 1000 Hz, particularly 500 to 1000 Hz.
  • the vehicle member includes the above sound absorbing material.
  • the vehicle member may be an automobile member.
  • Exterior Vehicle members that are sound absorbing members of exterior materials for vehicles, exterior materials for vehicles. Examples of the exterior include an undercover or undercover (for vehicles), a soundproof cover, and the like, and specifically, an engine undercover, a floor undercover, a rear undercover, a mission cover, a fender liner / protector, a mudguard, and the like.
  • Interior Vehicle members that are sound absorbing members of interior materials for vehicles, interior materials for vehicles.
  • Examples of the interior include a vehicle silencer, a vehicle soundproofing body, and specifically, a ceiling material (roof silencer), a dash silencer, a floor silencer, a floor carpet, a hood silencer, and the like.
  • Others Sound absorbing material for tires.
  • Examples of the sound absorbing material for tires include a sound absorbing structure in which a vehicle cover, a case, or the like and the above sound absorbing material are combined.
  • a resin film, a first base material layer having communication holes, and a second base material layer having communication holes are provided in this order, and the density of the first base material layer is higher than the density of the second base material layer.
  • Sound absorbing material in which the ventilation resistance of the first base material layer is higher than the ventilation resistance of the second base material layer.
  • the above-mentioned sound absorbing material, wherein the first base material layer and the second base material layer are resin foams or non-woven fabrics.
  • the above-mentioned sound absorbing material, wherein the thickness of the first base material layer is thinner than the thickness of the second base material layer.
  • the above-mentioned sound absorbing material further comprising an adhesive layer at least between the resin film and the first base material layer, and between the first base material layer and the second base material layer. Density of the first base layer is a 0.015 ⁇ 0.45g / cm 3, the density of the second substrate layer is 0.005 ⁇ 0.20g / cm 3, the above-described sound-absorbing material.
  • the aeration resistance of the first base material layer is 0.02 to 0.7 kPa ⁇ s / m, and the aeration resistance of the second base material layer is 0.003 to 0.45 kPa ⁇ s / m.
  • Sound absorbing material The above-mentioned sound absorbing material having a thickness of 1 to 100 mm.
  • a first base material layer having communication holes and a second base material layer having communication holes are provided in this order, and the density of the first base material layer is higher than the density of the second base material layer.
  • a sound absorption improving member used so that the material layer side is the incident direction of sound.
  • the vertically incident sound absorption coefficient of each of the produced sound absorbing materials was measured according to the following. Sound was incident from the resin film side. The average value of the vertically incident sound absorption coefficient at 500 to 1000 Hz was calculated as the average sound absorption coefficient, and the ratio when the average sound absorption coefficient of the comparative example was 100 was taken as the sound absorption characteristic of the sound absorbing material. The results are shown in Tables 3 and 4.
  • FIGS. 2 and 4, and 3 and 5 are diagrams showing the vertical incident sound absorption coefficient of Examples and Comparative Examples, respectively.
  • a sound absorbing material having a structure in which the density of the first base material layer is higher than the density of the second base material layer has sound absorbing characteristics in a low frequency region as compared with a sound absorbing material having no such structure. It turns out that it is excellent.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un élément d'absorption acoustique comprenant, dans cet ordre, un film de résine, une première couche de substrat ayant un trou de communication, et une seconde couche de substrat ayant un trou de communication. La densité de la première couche de substrat est supérieure à la densité de la seconde couche de substrat.
PCT/JP2021/009275 2020-03-10 2021-03-09 Matériau d'absorption acoustique, élément d'amélioration de propriété d'absorption acoustique et élément de véhicule WO2021182466A1 (fr)

Priority Applications (1)

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JP2022507217A JPWO2021182466A1 (fr) 2020-03-10 2021-03-09

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Application Number Priority Date Filing Date Title
JP2020040938 2020-03-10
JP2020-040938 2020-03-10
JP2020-040941 2020-03-10
JP2020040941 2020-03-10

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WO2021182466A1 true WO2021182466A1 (fr) 2021-09-16

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003216158A (ja) * 2002-01-18 2003-07-30 Kasai Kogyo Co Ltd 車両用防音材
JP2005227747A (ja) * 2003-10-29 2005-08-25 Takehiro:Kk 超軽量な防音材
JP2007086505A (ja) * 2005-09-22 2007-04-05 Du Pont Toray Co Ltd 吸遮音材

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003216158A (ja) * 2002-01-18 2003-07-30 Kasai Kogyo Co Ltd 車両用防音材
JP2005227747A (ja) * 2003-10-29 2005-08-25 Takehiro:Kk 超軽量な防音材
JP2007086505A (ja) * 2005-09-22 2007-04-05 Du Pont Toray Co Ltd 吸遮音材

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