WO2021182468A1 - Sound absorbing material, sound absorption performance improving member, and vehicle member - Google Patents
Sound absorbing material, sound absorption performance improving member, and vehicle member Download PDFInfo
- Publication number
- WO2021182468A1 WO2021182468A1 PCT/JP2021/009286 JP2021009286W WO2021182468A1 WO 2021182468 A1 WO2021182468 A1 WO 2021182468A1 JP 2021009286 W JP2021009286 W JP 2021009286W WO 2021182468 A1 WO2021182468 A1 WO 2021182468A1
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- WIPO (PCT)
- Prior art keywords
- base material
- material layer
- sound absorbing
- sound
- absorbing material
- Prior art date
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Images
Classifications
-
- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- 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
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
-
- 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
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
-
- 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 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 wide frequency range. 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.
- a sound absorbing material having a density lower than that of a material layer is provided.
- 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. It relates to a sound absorption improving member which is lower than the above and is used so that the first base material layer side is 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 lower 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 substrate layer may be 0.005 to 0.20 g / cm 3
- the density of the second substrate layer may be 0.015 to 0.30 g / cm 3. good.
- the aeration resistance of the first base material layer may be 0.003 to 0.45 kPa ⁇ s / m, and the aeration resistance of the second base material layer is 0.02 to 0.5 kPa ⁇ s / m. It may be m.
- 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 wide low frequency range. 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.
- Base layer examples of the base material layer having communication holes 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, from the viewpoint of excellent sound absorption characteristics in a wide frequency range.
- 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 a wide frequency range. 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 a wide 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 lower than the density of the second base material layer from the viewpoint of excellent sound absorption characteristics in a wide frequency region.
- the density of the first base material layer can be 0.005 to 0.20 g / cm 3 from the viewpoint of excellent sound absorption characteristics in a wide frequency range. It may be 007 to 0.16 g / cm 3 or 0.009 to 0.12 g / cm 3.
- the density of the second base material layer may be 0.015 to 0.30 g / cm 3 from the viewpoint of excellent sound absorption characteristics in a wide frequency range. It may be 0.020 to 0.25 g / cm 3 or 0.025 to 0.20 g / cm 3 .
- the ratio of the density of the second base material layer to the density of the first base material layer is 1.2 from the viewpoint of excellent sound absorption characteristics in a wide frequency range. It can be ⁇ 10, and can be 1.2 ⁇ 5.
- the ventilation resistance of the first base material layer may be lower than the ventilation resistance of the second base material layer.
- the ventilation resistance of the first base material layer can be 0.003 to 0.45 kPa ⁇ s / m from the viewpoint of excellent sound absorption characteristics in a wide frequency range. It may be 0.004 to 0.3 kPa ⁇ s / m, or 0.005 to 0.25 kPa ⁇ s / m.
- the ventilation resistance of the second base material layer is set to 0.02 to 0.5 kPa ⁇ s / m from the viewpoint of being superior in sound absorption characteristics in a wide frequency range. It may be 0.025 to 0.4 kPa ⁇ s / m, or 0.03 to 0.3 kPa ⁇ s / m.
- the ratio of the ventilation resistance of the second base material layer to the ventilation resistance of the first base material layer is from the viewpoint of being superior in sound absorption characteristics in a wide frequency range. , 1.1 to 20, and 1.2 to 16.
- 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 a wide frequency range. 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 a wide frequency range. Further, from the viewpoint of excellent sound absorption characteristics in a wide frequency range, 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 a wide frequency range and adjusting the sound absorbing frequency peak.
- the perforated film may have holes arranged in a grid pattern or a diamond shape.
- 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, from the viewpoint of excellent sound absorption characteristics in a wide frequency range. 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 vertical incident sound absorption coefficient of the sound absorbing material at 500 to 1500 Hz which is measured in accordance with JIS A 1405-1, can be 0.45 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 lower 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 wide frequency range. 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 wide frequency region referred to here can be a region having a frequency of 500 to 1500 Hz, and the sound absorbing material has excellent sound absorbing characteristics in the frequency region.
- 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 lower than the density of the second base material layer.
- Sound absorbing material The above-mentioned sound absorbing material, wherein the ventilation resistance of the first base material layer is lower 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.
- the above-mentioned sound absorbing material having a density of the first base material layer of 0.005 to 0.20 g / cm 3 and a density of the second base material layer of 0.015 to 0.30 g / cm 3.
- the aeration resistance of the first base material layer is 0.003 to 0.45 kPa ⁇ s / m, and the aeration resistance of the second base material layer is 0.02 to 0.5 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 lower 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 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 wider frequency range than the sound absorbing material having no such structure. It turns out that it is excellent.
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Abstract
A sound absorbing material which sequentially comprises a resin film, a first base material layer having a communicating pore, and a second base material layer having a communicating pore in this order, wherein the density of the first base material layer is lower than the density of the second base material layer.
Description
本発明は、吸音材、吸音性向上部材及び車両部材に関する。
The present invention relates to a sound absorbing material, a sound absorbing property improving member, and a vehicle member.
メルトブロー不織布からなる単一層の吸音構造体が知られている（例えば、特許文献１）。
A single-layer sound-absorbing structure made of melt-blown non-woven fabric is known (for example, Patent Document 1).
不織布からなる単一層の吸音構造体の場合、広い周波数領域において吸音特性を高く維持することが難しい。
In the case of a single-layer sound absorbing structure made of non-woven fabric, it is difficult to maintain high sound absorbing characteristics in a wide frequency range.
本発明は上記事情に鑑みてなされたものであり、広い周波数領域における吸音特性に優れる吸音材を提供することを目的とする。本発明はまた、吸音性向上部材及び車両部材を提供することを目的とする。
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 wide frequency range. It is also an object of the present invention to provide a sound absorbing property improving member and a vehicle member.
以下に説明する吸音材は、音の入射側から、いわゆる重りの機能を有する硬い層（樹脂フィルム）と、バネの機能を有する柔らかい層（連通孔を有する基材層）を備えており、これらの層の組合せにより、好適に音を吸収することができると考えられる。発明者らは、そのような吸音材において、当該柔らかい層を密度の異なる二層構成とすることで、吸音特性の周波数依存性を調整できることを見出した。
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.
本発明の一側面は、樹脂フィルムと、連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備え、第一基材層の密度が、第二基材層の密度よりも低い、吸音材を提供する。
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. A sound absorbing material having a density lower than that of a material layer is provided.
本発明の一側面は、連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備え、第一基材層の密度が、第二基材層の密度よりも低く、第一基材層側が音の入射方向となるように用いられる、吸音性向上部材に関する。
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. It relates to a sound absorption improving member which is lower than the above and is used so that the first base material layer side is the incident direction of sound.
本発明の一側面は、上記の吸音材を備える車両部材に関する。
One aspect of the present invention relates to a vehicle member provided with the above sound absorbing material.
一態様において、第一基材層の通気抵抗が、第二基材層の通気抵抗よりも低くてよい。
In one embodiment, the ventilation resistance of the first base material layer may be lower than the ventilation resistance of the second base material layer.
一態様において、第一基材層及び第二基材層が、樹脂発泡体又は不織布であってよい。
In one embodiment, the first base material layer and the second base material layer may be a resin foam or a non-woven fabric.
一態様において、第一基材層の厚さが、第二基材層の厚さよりも薄くてよい。
In one embodiment, the thickness of the first base material layer may be thinner than the thickness of the second base material layer.
一態様において、樹脂フィルムが、ポリオレフィン、ポリエステル又はポリアミドから構成されていてよい。
In one embodiment, the resin film may be composed of polyolefin, polyester or polyamide.
一態様において、吸音材が、樹脂フィルムの少なくともいずれかの表面に、金属蒸着層を有してよい。
In one embodiment, the sound absorbing material may have a metal vapor deposition layer on at least one surface of the resin film.
一態様において、吸音材が、樹脂フィルム及び第一基材層間、並びに第一基材層及び第二基材層間の少なくともいずれかに、接着剤層をさらに備えてよい。
In one embodiment, 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.
一態様において、第一基材層の密度が、０．００５～０．２０ｇ／ｃｍ３であってよく、第二基材層の密度が、０．０１５～０．３０ｇ／ｃｍ３であってよい。
In one embodiment, the density of the first substrate layer may be 0.005 to 0.20 g / cm 3 , and the density of the second substrate layer may be 0.015 to 0.30 g / cm 3. good.
一態様において、第一基材層の通気抵抗が、０．００３～０．４５ｋＰａ・ｓ／ｍであってよく、第二基材層の通気抵抗が、０．０２～０．５ｋＰａ・ｓ／ｍであってよい。
In one embodiment, the aeration resistance of the first base material layer may be 0.003 to 0.45 kPa · s / m, and the aeration resistance of the second base material layer is 0.02 to 0.5 kPa · s / m. It may be m.
一態様において、吸音材の厚さが１～１００ｍｍであってよい。
In one embodiment, the thickness of the sound absorbing material may be 1 to 100 mm.
本発明によれば、広い低周波数領域における吸音特性に優れる吸音材を提供することができる。また、本発明によれば、吸音性向上部材及び車両部材を提供することができる。
According to the present invention, it is possible to provide a sound absorbing material having excellent sound absorbing characteristics in a wide low frequency range. Further, according to the present invention, it is possible to provide a sound absorbing property improving member and a vehicle member.
＜吸音材＞
図１は吸音材の模式断面図である。吸音材１０は、樹脂フィルム１と、基材層として連通孔を有する第一基材層２及び連通孔を有する第二基材層３と、をこの順に備える。樹脂フィルム側から入射した音（音響エネルギー）は、吸音材を透過する際に熱エネルギーとして散逸される。これにより音の減衰が観察される。 <Sound absorbing material>
FIG. 1 is a schematic cross-sectional view of the sound absorbing material. Thesound 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.
図１は吸音材の模式断面図である。吸音材１０は、樹脂フィルム１と、基材層として連通孔を有する第一基材層２及び連通孔を有する第二基材層３と、をこの順に備える。樹脂フィルム側から入射した音（音響エネルギー）は、吸音材を透過する際に熱エネルギーとして散逸される。これにより音の減衰が観察される。 <Sound absorbing material>
FIG. 1 is a schematic cross-sectional view of the sound absorbing material. The
（基材層）
連通孔を有する基材層としては、樹脂発泡体、不織布、高分子多孔体、多孔質セラミック等が挙げられる。これらのうち、広い周波数領域における吸音特性に優れる観点から、基材層は樹脂発泡体又は不織布であってよく、不織布であってよい。第一基材層及び第二基材層は、同じ素材から構成されていてもよく、異なる素材から構成されていてもよい。 (Base layer)
Examples of the base material layer having communication holes include a resin foam, a non-woven fabric, a polymer porous body, and a porous ceramic. Of these, the base material layer may be a resin foam or a non-woven fabric, or may be a non-woven fabric, from the viewpoint of excellent sound absorption characteristics in a wide frequency range. 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.
連通孔を有する基材層としては、樹脂発泡体、不織布、高分子多孔体、多孔質セラミック等が挙げられる。これらのうち、広い周波数領域における吸音特性に優れる観点から、基材層は樹脂発泡体又は不織布であってよく、不織布であってよい。第一基材層及び第二基材層は、同じ素材から構成されていてもよく、異なる素材から構成されていてもよい。 (Base layer)
Examples of the base material layer having communication holes include a resin foam, a non-woven fabric, a polymer porous body, and a porous ceramic. Of these, the base material layer may be a resin foam or a non-woven fabric, or may be a non-woven fabric, from the viewpoint of excellent sound absorption characteristics in a wide frequency range. 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.
樹脂発泡体の素材としては、例えば、ポリエチレン樹脂、ポリプロピレン樹脂、ポリウレタン樹脂、ポリエステル樹脂、アクリル樹脂、ポリスチレン樹脂、メラミン樹脂、シリコーン樹脂、天然ゴム、合成ゴム等が挙げられる。耐熱性、難燃性等の観点から、樹脂発泡体の素材はメラミン樹脂であってよい。
Examples of the material of the resin foam 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.
不織布を構成する繊維としては、有機繊維及び無機繊維が挙げられる。有機繊維としては、例えば、ポリエチレン（低密度又は高密度）、ポリプロピレン、共重合ポリエチレン、共重合ポリプロピレン等のポリオレフィン繊維、ポリエチレンテレフタレート、ポリトリメチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレート等のポリエステル繊維、ポリアミド繊維、アクリル繊維、ナイロン繊維、レーヨン繊維、ウール等の天然繊維などが挙げられる。また、無機繊維としては、ガラス繊維、金属繊維、セラミックス繊維、炭素繊維等が挙げられる。不織布を構成する繊維は、これらを１種又は２種以上を含むことができる。
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. Further, 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.
基材層の厚さは、広い周波数領域における吸音特性に優れる観点から、０．１～５０ｍｍとすることができ、０．５～２０ｍｍであってもよく、２．０～１０ｍｍであってもよい。第一基材層及び第二基材層は、同じ厚さを有していてもよく、異なる厚さを有していてもよい。広い周波数領域における吸音特性に優れる観点から、第一基材層（音の入射側の基材層）の厚さが、第二基材層の厚さよりも薄くてよい。
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 a wide frequency range. 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 a wide 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.
広い周波数領域における吸音特性に優れる観点から、第一基材層の密度は、第二基材層の密度よりも低い。そのような第二基材層との組み合わせにおいて、第一基材層の密度は、広い周波数領域における吸音特性に優れる観点から、０．００５～０．２０ｇ／ｃｍ３とすることができ０．００７～０．１６ｇ／ｃｍ３であってもよく、０．００９～０．１２ｇ／ｃｍ３であってもよい。
The density of the first base material layer is lower than the density of the second base material layer from the viewpoint of excellent sound absorption characteristics in a wide frequency region. In combination with such a second base material layer, the density of the first base material layer can be 0.005 to 0.20 g / cm 3 from the viewpoint of excellent sound absorption characteristics in a wide frequency range. It may be 007 to 0.16 g / cm 3 or 0.009 to 0.12 g / cm 3.
また、上記のような第一基材層との組み合わせにおいて、第二基材層の密度は、広い周波数領域における吸音特性に優れる観点から、０．０１５～０．３０ｇ／ｃｍ３とすることができ０．０２０～０．２５ｇ／ｃｍ３であってもよく、０．０２５～０．２０ｇ／ｃｍ３であってもよい。
Further, in combination with the first base material layer as described above, the density of the second base material layer may be 0.015 to 0.30 g / cm 3 from the viewpoint of excellent sound absorption characteristics in a wide frequency range. It may be 0.020 to 0.25 g / cm 3 or 0.025 to 0.20 g / cm 3 .
第一基材層の密度に対する第二基材層の密度の比（第二基材層の密度／第一基材層の密度）は、広い周波数領域における吸音特性に優れる観点から、１．２～１０とすることができ、１．２～５とすることができる。
The ratio of the density of the second base material layer to the density of the first base material layer (density of the second base material layer / density of the first base material layer) is 1.2 from the viewpoint of excellent sound absorption characteristics in a wide frequency range. It can be ~ 10, and can be 1.2 ~ 5.
広い周波数領域における吸音特性により優れる観点から、第一基材層の通気抵抗は、第二基材層の通気抵抗よりも低くてよい。そのような第二基材層との組み合わせにおいて、第一基材層の通気抵抗は、広い周波数領域における吸音特性に優れる観点から、０．００３～０．４５ｋＰａ・ｓ／ｍとすることができ０．００４～０．３ｋＰａ・ｓ／ｍであってもよく、０．００５～０．２５ｋＰａ・ｓ／ｍであってもよい。
From the viewpoint of being superior in sound absorption characteristics in a wide frequency range, the ventilation resistance of the first base material layer may be lower than the ventilation resistance of the second base material layer. In combination with such a second base material layer, the ventilation resistance of the first base material layer can be 0.003 to 0.45 kPa · s / m from the viewpoint of excellent sound absorption characteristics in a wide frequency range. It may be 0.004 to 0.3 kPa · s / m, or 0.005 to 0.25 kPa · s / m.
また、上記のような第一基材層との組み合わせにおいて、第二基材層の通気抵抗は、広い周波数領域における吸音特性により優れる観点から、０．０２～０．５ｋＰａ・ｓ／ｍとすることができ０．０２５～０．４ｋＰａ・ｓ／ｍであってもよく、０．０３～０．３ｋＰａ・ｓ／ｍであってもよい。
Further, in combination with the first base material layer as described above, the ventilation resistance of the second base material layer is set to 0.02 to 0.5 kPa · s / m from the viewpoint of being superior in sound absorption characteristics in a wide frequency range. It may be 0.025 to 0.4 kPa · s / m, or 0.03 to 0.3 kPa · s / m.
第一基材層の通気抵抗に対する第二基材層の通気抵抗の比（第二基材層の通気抵抗／第一基材層の通気抵抗）は、広い周波数領域における吸音特性により優れる観点から、１．１～２０とすることができ、１．２～１６とすることができる。
The ratio of the ventilation resistance of the second base material layer to the ventilation resistance of the first base material layer (ventilation resistance of the second base material layer / ventilation resistance of the first base material layer) is from the viewpoint of being superior in sound absorption characteristics in a wide frequency range. , 1.1 to 20, and 1.2 to 16.
基材層の通気抵抗は、カトーテック株式会社製の通気性試験機（ＫＥＳ－Ｆ８）等により測定される。
The ventilation resistance of the base material layer is measured by a breathability tester (KES-F8) manufactured by Kato Tech Co., Ltd.
吸音材は、広い周波数領域における吸音特性に優れる観点から、さらに連通孔を有する他の基材層を備えていてもよい。すなわち、吸音材は、連通孔を有する第一基材層及び連通孔を有する第二基材層に加えて、さらに連通孔を有する第三基材層、連通孔を有する第四基材層等を備えていてもよい。各基材層は、同じ素材から構成されていてもよく、異なる素材から構成されていてもよい。
The sound absorbing material may further include another base material layer having communication holes from the viewpoint of excellent sound absorbing characteristics in a wide frequency range. 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.
（樹脂フィルム）
樹脂フィルムを構成する樹脂としては、例えば、ポリエチレン（低密度又は高密度）、ポリプロピレン（延伸又は未延伸）、共重合ポリエチレン、共重合ポリプロピレン等のポリオレフィン系樹脂、ポリエチレンテレフタレート、ポリトリメチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレート等のポリエステル系樹脂、ＰＴＦＥ、ＦＥＰ、ＰＦＡ等のフッ素系樹脂、ポリイミド系樹脂、ポリアミド系樹脂、アラミド系樹脂、塩化ビニル系樹脂、アクリル系樹脂、ポリカーボネート系樹脂、ポリフェニレンサルファイド系樹脂、ポリビニルアルコール系樹脂、ポリスチレン系樹脂、ポリアクリロニトリル系樹脂、エチレン・酢酸ビニル系樹脂などが挙げられる。樹脂フィルムは、連通孔を有しないフィルムである。 (Resin film)
Examples of the resin constituting the resin film 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. Examples thereof include based resins, polyphenylene sulfide resins, polyvinyl alcohol resins, polystyrene resins, polyacrylonitrile resins, ethylene / vinyl acetate resins and the like. The resin film is a film that does not have communication holes.
樹脂フィルムを構成する樹脂としては、例えば、ポリエチレン（低密度又は高密度）、ポリプロピレン（延伸又は未延伸）、共重合ポリエチレン、共重合ポリプロピレン等のポリオレフィン系樹脂、ポリエチレンテレフタレート、ポリトリメチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレート等のポリエステル系樹脂、ＰＴＦＥ、ＦＥＰ、ＰＦＡ等のフッ素系樹脂、ポリイミド系樹脂、ポリアミド系樹脂、アラミド系樹脂、塩化ビニル系樹脂、アクリル系樹脂、ポリカーボネート系樹脂、ポリフェニレンサルファイド系樹脂、ポリビニルアルコール系樹脂、ポリスチレン系樹脂、ポリアクリロニトリル系樹脂、エチレン・酢酸ビニル系樹脂などが挙げられる。樹脂フィルムは、連通孔を有しないフィルムである。 (Resin film)
Examples of the resin constituting the resin film 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. Examples thereof include based resins, polyphenylene sulfide resins, polyvinyl alcohol resins, polystyrene resins, polyacrylonitrile resins, ethylene / vinyl acetate resins and the like. The resin film is a film that does not have communication holes.
樹脂フィルムの厚さは、広い周波数領域における吸音特性に優れる観点から、０．５～５００μｍとすることができ、５～２５０μｍであってもよく、１０～１００μｍであってもよい。また、広い周波数領域における吸音特性に優れる観点から、樹脂フィルムの厚さに対する基材層の厚さの比率（基材層の厚さ／樹脂フィルムの厚さ）は、１～２００００とすることができ、１０～１００００であってもよく、１００～１０００であってもよい。
The thickness of the resin film can be 0.5 to 500 μm, 5 to 250 μm, or 10 to 100 μm from the viewpoint of excellent sound absorption characteristics in a wide frequency range. Further, from the viewpoint of excellent sound absorption characteristics in a wide frequency range, 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.
樹脂フィルムは、フィルム特性の調整による吸音効果の向上機能、及び熱線反射機能の付与の観点から、その表面に金属蒸着層を備えていてもよい。すなわち、吸音材は、樹脂フィルムの表面に、金属蒸着層をさらに備えてよい。金属蒸着層は、アルミニウム、銅、亜鉛、亜鉛合金、銀等の金属を真空蒸着等の物理蒸着又は化学蒸着により形成できる。金属蒸着層は樹脂フィルムの両面に設けられていてもよく、一方の面に設けられていてもよい。
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.
樹脂フィルムは、広い周波数領域の吸音効果の向上及び吸音周波数ピークの調整の観点から、有孔フィルムであってもよい。有孔フィルムは格子状や菱形状に配列した孔を有してよい。当該孔は、広い周波数領域における吸音特性に優れる観点から、直径が０．１～５０．０ｍｍの円形状であってよく、０．２～１０．０ｍｍの円形状であってよく、０．３～５．０ｍｍの円形状であってよい。孔の形状は、円形、楕円形、長方形、多角形等であってよい。
The resin film may be a perforated film from the viewpoint of improving the sound absorbing effect in a wide frequency range and adjusting the sound absorbing frequency peak. The perforated film may have holes arranged in a grid pattern or a diamond shape. 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, from the viewpoint of excellent sound absorption characteristics in a wide frequency range. 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.
（接着剤層）
吸音材は、上記の各層間にさらに接着剤層を備えていてもよい。例えば、吸音材は、樹脂フィルム及び第一基材層間、並びに第一基材層及び第二基材層間の少なくともいずれかに接着剤層を備えていてもよい。接着剤層としては、酢酸ビニル樹脂、ポリオレフィン樹脂、エチレン・酢酸ビニル共重合樹脂、イソブテン・無水マレイン酸共重合樹脂、アクリル共重合樹脂、アクリルモノマー、アクリルオリゴマー、スチレン・ブタジエンゴム、塩化ビニル樹脂、クロロプレンゴム、ニトリルゴム、ウレタン樹脂、シリル化ウレタン樹脂、エポキシ樹脂、変性エポキシ樹脂、ポリエチレン樹脂、アイオノマー樹脂、シリコーン樹脂、変性シリコーン樹脂、水ガラス、シリケート等の接着成分を含む層、あるいは紙、布、樹脂フィルム、金属テープ等から構成される支持体の両面にこれらの接着成分を含む層を備える積層物（例えば両面テープ）などが挙げられる。各接着剤層は、同じ素材から構成されていてもよく、異なる素材から構成されていてもよい。 (Adhesive layer)
The sound absorbing material may further include an adhesive layer between the above layers. For example, 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. As 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.
吸音材は、上記の各層間にさらに接着剤層を備えていてもよい。例えば、吸音材は、樹脂フィルム及び第一基材層間、並びに第一基材層及び第二基材層間の少なくともいずれかに接着剤層を備えていてもよい。接着剤層としては、酢酸ビニル樹脂、ポリオレフィン樹脂、エチレン・酢酸ビニル共重合樹脂、イソブテン・無水マレイン酸共重合樹脂、アクリル共重合樹脂、アクリルモノマー、アクリルオリゴマー、スチレン・ブタジエンゴム、塩化ビニル樹脂、クロロプレンゴム、ニトリルゴム、ウレタン樹脂、シリル化ウレタン樹脂、エポキシ樹脂、変性エポキシ樹脂、ポリエチレン樹脂、アイオノマー樹脂、シリコーン樹脂、変性シリコーン樹脂、水ガラス、シリケート等の接着成分を含む層、あるいは紙、布、樹脂フィルム、金属テープ等から構成される支持体の両面にこれらの接着成分を含む層を備える積層物（例えば両面テープ）などが挙げられる。各接着剤層は、同じ素材から構成されていてもよく、異なる素材から構成されていてもよい。 (Adhesive layer)
The sound absorbing material may further include an adhesive layer between the above layers. For example, 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. As 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.
接着剤層の厚さは特に限定されないが、０．０１～５００μｍとすることができ、１～２５０μｍであってもよい。各接着剤層は、同じ厚さを有していてもよく、異なる厚さを有していてもよい。
The thickness of the adhesive layer is not particularly limited, but may be 0.01 to 500 μm, and may be 1 to 250 μm. Each adhesive layer may have the same thickness or may have different thicknesses.
吸音材の厚さは、吸音特性の発現、材料の施工性、省スペース化等の観点から、１～１００ｍｍとすることができ、２～５０ｍｍであってもよく、５～３０ｍｍであってもよい。
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.
ＪＩＳ Ａ １４０５－１に準拠して測定される、吸音材の５００～１５００Ｈｚにおける平均垂直入射吸音率は、０．４５以上とすることができる。
The average vertical incident sound absorption coefficient of the sound absorbing material at 500 to 1500 Hz, which is measured in accordance with JIS A 1405-1, can be 0.45 or more.
＜吸音材の製造方法＞
吸音材は、各層を積層することにより製造することができる。吸音材は、上記のとおり接着剤層を備えることにより各層が接着された状態で用いられてもよいが、各層が接着されずに用いられてもよい。また、一部の層間のみに接着剤層が設けられてもよい。吸音材を構成する積層体は、筐体に収納された状態で用いてもよい。 <Manufacturing method of sound absorbing material>
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.
吸音材は、各層を積層することにより製造することができる。吸音材は、上記のとおり接着剤層を備えることにより各層が接着された状態で用いられてもよいが、各層が接着されずに用いられてもよい。また、一部の層間のみに接着剤層が設けられてもよい。吸音材を構成する積層体は、筐体に収納された状態で用いてもよい。 <Manufacturing method of sound absorbing material>
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.
＜吸音性向上部材＞
吸音材が備える基材層の部分を、吸音性向上部材として用いることができる。吸音性向上部材は、連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備える。吸音性向上部材は、第一基材層側が音の入射方向となるように用いられ、第一基材層の密度が、第二基材層の密度よりも低い。 <Sound absorption improving member>
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 lower than the density of the second base material layer.
吸音材が備える基材層の部分を、吸音性向上部材として用いることができる。吸音性向上部材は、連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備える。吸音性向上部材は、第一基材層側が音の入射方向となるように用いられ、第一基材層の密度が、第二基材層の密度よりも低い。 <Sound absorption improving member>
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 lower than the density of the second base material layer.
吸音性向上部材は、吸音特性を向上させたい（吸音性を付与したい）基体の、音が出射する面上に設けられる。基体上に、吸音性向上部材を、基体と第一基材層とが対向するように設けることで、基体の吸音特性を向上させることができる。すなわち、吸音特性を向上させたい基体上に、吸音性向上部材を、基体と第一基材層とが対向するように設けることで、吸音構造体を得ることができる。得られる吸音構造体は、基体と、吸音性向上部材と、を備えるものであって、基体、第一基材層及び第二基材層をこの順に備えることになる。当該構成により、上記吸音材と同様の構成（音の入射側から、重りの機能を有する硬い層及びバネの機能を有する柔らかい層）が実現される。
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. 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.
基体上への吸音性向上部材の設け方としては、基体と吸音性向上部材とを上記接着剤層により貼り合わせる方法、基体上に吸音性向上部材を載置した状態で筐体等を用いて吸音性向上部材を固定する方法、などが挙げられるが、これらの方法に制限されるものではない。
As 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.
基材層に関しては、上記吸音材の記載を適宜参照することができる。また、基体としては、樹脂板、ゴム板、繊維板、金属板、セラミックス板、ガラス板等が挙げられる。それらの材質としては具体的には、ポリエチレン（低密度又は高密度）、ポリプロピレン、共重合ポリエチレン、共重合ポリプロピレン等のポリオレフィン系樹脂、ポリエチレンテレフタレート、ポリトリメチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレート等のポリエステル系樹脂、ＰＴＦＥ、ＦＥＰ、ＰＦＡ等のフッ素系樹脂、ポリウレタン系樹脂、ポリイミド系樹脂、ポリアミド系樹脂、アラミド系樹脂、塩化ビニル系樹脂、アクリル系樹脂、ポリカーボネート系樹脂、ポリフェニレンサルファイド系樹脂、ポリビニルアルコール系樹脂、ポリスチレン系樹脂、ポリアクリロニトリル系樹脂、エチレン・酢酸ビニル系樹脂等の樹脂；天然ゴム、スチレン・ブタジエンゴム、イソプレンゴム、ブタジエンゴム、クロロプレンゴム、アクリロニトリルブタジエンゴム、ブチルゴム、エチレンプロピレンゴム、エチレンプロピレンジエンゴム、ウレタンゴム、シリコーンゴム、フッ素ゴム、アクリルゴム、エピクロロヒドリンゴム、クロロスルホン化ポリエチレン、塩素化ポリエチレン等のゴム；ポリエチレン（低密度又は高密度）、ポリプロピレン、共重合ポリエチレン、共重合ポリプロピレン等のポリオレフィン繊維、ポリエチレンテレフタレート、ポリトリメチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレート等のポリエステル繊維、ポリアミド繊維、アクリル繊維、ナイロン繊維、レーヨン繊維、ウール等の天然繊維、ガラス繊維、金属繊維、セラミックス繊維、炭素繊維などの繊維；銅、アルミニウム、チタン、ステンレス、真鍮等の金属；窒化珪素、炭化珪素等のセラミックス；ガラスが挙げられる。
Regarding the base material layer, the above description of the sound absorbing material can be referred to as appropriate. Examples of 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 polyethylene and copolymerized polypropylene, polyester fibers such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and polybutylene naphthalate, polyamide fibers, acrylic fibers, nylon fibers, rayon fibers, Natural fibers such as wool, glass fibers, metal fibers, ceramic fibers, carbon fibers and the like; metals such as copper, aluminum, titanium, stainless steel and brass; ceramics such as silicon nitride and silicon carbide; glass.
＜吸音材及び吸音性向上部材の用途＞
上記吸音材及び吸音性向上部材は広い周波数領域における吸音特性に優れる。そのため、上記吸音材及び吸音性向上部材は、自動車、鉄道車両、航空機、船舶、住宅等の建築物、電子機器、精密機械などの用途において好適に用いることができる。ここでいう広い周波数領域とは、周波数が５００～１５００Ｈｚの領域とすることができ、上記吸音材は、当該周波数領域において優れた吸音特性を有する。 <Use of sound absorbing material and sound absorbing material improving member>
The sound absorbing material and the sound absorbing property improving member are excellent in sound absorbing characteristics in a wide frequency range. 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 wide frequency region referred to here can be a region having a frequency of 500 to 1500 Hz, and the sound absorbing material has excellent sound absorbing characteristics in the frequency region.
上記吸音材及び吸音性向上部材は広い周波数領域における吸音特性に優れる。そのため、上記吸音材及び吸音性向上部材は、自動車、鉄道車両、航空機、船舶、住宅等の建築物、電子機器、精密機械などの用途において好適に用いることができる。ここでいう広い周波数領域とは、周波数が５００～１５００Ｈｚの領域とすることができ、上記吸音材は、当該周波数領域において優れた吸音特性を有する。 <Use of sound absorbing material and sound absorbing material improving member>
The sound absorbing material and the sound absorbing property improving member are excellent in sound absorbing characteristics in a wide frequency range. 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 wide frequency region referred to here can be a region having a frequency of 500 to 1500 Hz, and the sound absorbing material has excellent sound absorbing characteristics in the frequency region.
＜車両部材＞
車両部材は上記の吸音材を備える。車両部材としては、例えば以下の態様が挙げられる。車両部材は自動車部材であってよい。
外装：車両用外装材の吸音部材である車両部材、車両用外装材。
外装としては、（車両用）アンダーカバー又はアンダープロテクター、防音カバー等が挙げられ、具体的にはエンジンアンダーカバー、フロアアンダーカバー、リアアンダーカバー、ミッションカバー、フェンダライナ／プロテクタ又はマッドガード等が挙げられる。
内装：車両用内装材の吸音部材である車両部材、車両用内装材。
内装としては、車両用サイレンサー、車両用防音体等が挙げられ、具体的には天井材（ルーフサイレンサー）、ダッシュサイレンサー、フロアサイレンサー、フロアカーペット、フードサイレンサー等が挙げられる。
その他：タイヤ用吸音材。
タイヤ用吸音材としては、車両用カバー、ケース等と上記の吸音材を組み合わせた吸音構造体が挙げられる。 <Vehicle parts>
The vehicle member includes the above sound absorbing material. Examples of the vehicle member include the following aspects. 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.
車両部材は上記の吸音材を備える。車両部材としては、例えば以下の態様が挙げられる。車両部材は自動車部材であってよい。
外装：車両用外装材の吸音部材である車両部材、車両用外装材。
外装としては、（車両用）アンダーカバー又はアンダープロテクター、防音カバー等が挙げられ、具体的にはエンジンアンダーカバー、フロアアンダーカバー、リアアンダーカバー、ミッションカバー、フェンダライナ／プロテクタ又はマッドガード等が挙げられる。
内装：車両用内装材の吸音部材である車両部材、車両用内装材。
内装としては、車両用サイレンサー、車両用防音体等が挙げられ、具体的には天井材（ルーフサイレンサー）、ダッシュサイレンサー、フロアサイレンサー、フロアカーペット、フードサイレンサー等が挙げられる。
その他：タイヤ用吸音材。
タイヤ用吸音材としては、車両用カバー、ケース等と上記の吸音材を組み合わせた吸音構造体が挙げられる。 <Vehicle parts>
The vehicle member includes the above sound absorbing material. Examples of the vehicle member include the following aspects. 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.
本実施形態の内容を以下に列記する。
樹脂フィルムと、連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備え、第一基材層の密度が、第二基材層の密度よりも低い、吸音材。
第一基材層の通気抵抗が、第二基材層の通気抵抗よりも低い、上記の吸音材。
第一基材層及び第二基材層が、樹脂発泡体又は不織布である、上記の吸音材。
第一基材層の厚さが、第二基材層の厚さよりも薄い、上記の吸音材。
樹脂フィルムが、ポリオレフィン、ポリエステル又はポリアミドから構成される、上記の吸音材。
樹脂フィルムの少なくともいずれかの表面に、金属蒸着層をさらに備える、上記の吸音材。
樹脂フィルム及び第一基材層間、並びに第一基材層及び第二基材層間の少なくともいずれかに、接着剤層をさらに備える、上記の吸音材。
第一基材層の密度が、０．００５～０．２０ｇ／ｃｍ３であり、第二基材層の密度が、０．０１５～０．３０ｇ／ｃｍ３である、上記の吸音材。
第一基材層の通気抵抗が、０．００３～０．４５ｋＰａ・ｓ／ｍであり、第二基材層の通気抵抗が、０．０２～０．５ｋＰａ・ｓ／ｍである、上記の吸音材。
厚さが１～１００ｍｍである、上記の吸音材。
連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備え、第一基材層の密度が、第二基材層の密度よりも低く、第一基材層側が音の入射方向となるように用いられる、吸音性向上部材。
第一基材層の通気抵抗が、第二基材層の通気抵抗よりも低い、上記の吸音性向上部材。
上記の吸音材を備える、車両部材。 The contents of this embodiment are listed below.
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 lower than the density of the second base material layer. , Sound absorbing material.
The above-mentioned sound absorbing material, wherein the ventilation resistance of the first base material layer is lower 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 in which the resin film is composed of polyolefin, polyester or polyamide.
The sound absorbing material described above, further comprising a metal vapor deposition layer on at least one surface of the resin film.
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.
The above-mentioned sound absorbing material having a density of the first base material layer of 0.005 to 0.20 g / cm 3 and a density of the second base material layer of 0.015 to 0.30 g / cm 3.
The aeration resistance of the first base material layer is 0.003 to 0.45 kPa · s / m, and the aeration resistance of the second base material layer is 0.02 to 0.5 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 lower 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 sound absorption improving member described above, wherein the ventilation resistance of the first base material layer is lower than the ventilation resistance of the second base material layer.
A vehicle member having the above sound absorbing material.
樹脂フィルムと、連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備え、第一基材層の密度が、第二基材層の密度よりも低い、吸音材。
第一基材層の通気抵抗が、第二基材層の通気抵抗よりも低い、上記の吸音材。
第一基材層及び第二基材層が、樹脂発泡体又は不織布である、上記の吸音材。
第一基材層の厚さが、第二基材層の厚さよりも薄い、上記の吸音材。
樹脂フィルムが、ポリオレフィン、ポリエステル又はポリアミドから構成される、上記の吸音材。
樹脂フィルムの少なくともいずれかの表面に、金属蒸着層をさらに備える、上記の吸音材。
樹脂フィルム及び第一基材層間、並びに第一基材層及び第二基材層間の少なくともいずれかに、接着剤層をさらに備える、上記の吸音材。
第一基材層の密度が、０．００５～０．２０ｇ／ｃｍ３であり、第二基材層の密度が、０．０１５～０．３０ｇ／ｃｍ３である、上記の吸音材。
第一基材層の通気抵抗が、０．００３～０．４５ｋＰａ・ｓ／ｍであり、第二基材層の通気抵抗が、０．０２～０．５ｋＰａ・ｓ／ｍである、上記の吸音材。
厚さが１～１００ｍｍである、上記の吸音材。
連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備え、第一基材層の密度が、第二基材層の密度よりも低く、第一基材層側が音の入射方向となるように用いられる、吸音性向上部材。
第一基材層の通気抵抗が、第二基材層の通気抵抗よりも低い、上記の吸音性向上部材。
上記の吸音材を備える、車両部材。 The contents of this embodiment are listed below.
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 lower than the density of the second base material layer. , Sound absorbing material.
The above-mentioned sound absorbing material, wherein the ventilation resistance of the first base material layer is lower 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 in which the resin film is composed of polyolefin, polyester or polyamide.
The sound absorbing material described above, further comprising a metal vapor deposition layer on at least one surface of the resin film.
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.
The above-mentioned sound absorbing material having a density of the first base material layer of 0.005 to 0.20 g / cm 3 and a density of the second base material layer of 0.015 to 0.30 g / cm 3.
The aeration resistance of the first base material layer is 0.003 to 0.45 kPa · s / m, and the aeration resistance of the second base material layer is 0.02 to 0.5 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 lower 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 sound absorption improving member described above, wherein the ventilation resistance of the first base material layer is lower than the ventilation resistance of the second base material layer.
A vehicle member having the above sound absorbing material.
以下、実施例によって本発明を更に詳細に説明するが、本発明はこれらの実施例に限定されるものではない。
Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.
（基材層の準備）
表１及び表２に示す基材層を準備した。 (Preparation of base material layer)
The base material layers shown in Tables 1 and 2 were prepared.
表１及び表２に示す基材層を準備した。 (Preparation of base material layer)
The base material layers shown in Tables 1 and 2 were prepared.
（樹脂フィルムの準備）
以下の樹脂フィルムを準備した。
両面アルミニウム蒸着ポリエチレンテレフタレートフィルム（ＡｌＰＥＴ）：厚さ１２μｍ
２軸延伸ポリプロピレンフィルム（ＯＰＰ）：厚さ２０μｍ
低密度ポリエチレンフィルム（ＰＥ）：厚さ２５μｍ (Preparation of resin film)
The following resin films were prepared.
Double-sided aluminum-deposited polyethylene terephthalate film (AlPET): 12 μm thick
Biaxially stretched polypropylene film (OPP): 20 μm thick
Low density polyethylene film (PE): 25 μm thick
以下の樹脂フィルムを準備した。
両面アルミニウム蒸着ポリエチレンテレフタレートフィルム（ＡｌＰＥＴ）：厚さ１２μｍ
２軸延伸ポリプロピレンフィルム（ＯＰＰ）：厚さ２０μｍ
低密度ポリエチレンフィルム（ＰＥ）：厚さ２５μｍ (Preparation of resin film)
The following resin films were prepared.
Double-sided aluminum-deposited polyethylene terephthalate film (AlPET): 12 μm thick
Biaxially stretched polypropylene film (OPP): 20 μm thick
Low density polyethylene film (PE): 25 μm thick
（接着剤層の準備）
以下の接着剤層を準備した。
両面テープ：スリーエムジャパン株式会社、ＰＧＤ－１００、厚さ０．１２ｍｍ (Preparation of adhesive layer)
The following adhesive layers were prepared.
Double-sided tape: 3M Japan Ltd., PGD-100, thickness 0.12 mm
以下の接着剤層を準備した。
両面テープ：スリーエムジャパン株式会社、ＰＧＤ－１００、厚さ０．１２ｍｍ (Preparation of adhesive layer)
The following adhesive layers were prepared.
Double-sided tape: 3M Japan Ltd., PGD-100, thickness 0.12 mm
（吸音材の作製）
表３及び表４に示す構成を有する吸音材を作製した。各層の接着には両面テープを用いた。 (Making sound absorbing material)
Sound absorbing materials having the configurations shown in Tables 3 and 4 were produced. Double-sided tape was used to bond each layer.
表３及び表４に示す構成を有する吸音材を作製した。各層の接着には両面テープを用いた。 (Making sound absorbing material)
Sound absorbing materials having the configurations shown in Tables 3 and 4 were produced. Double-sided tape was used to bond each layer.
（吸音材の吸音特性評価）
作製した各吸音材の垂直入射吸音率を、以下に従って測定した。樹脂フィルム側から音を入射した。５００～１５００Ｈｚにおける垂直入射吸音率の平均値を平均吸音率として算出し、比較例の平均吸音率を１００とした場合の比をその吸音材の吸音特性とした。結果を表３及び表４に示す。
装置名：４２０６型インピーダンス管（ブリュエル・ケアー社）
測定方法：垂直入射吸音率（ＪＩＳ Ａ １４０５－１に準拠）
測定範囲：５０～１６００Ｈｚ (Evaluation of sound absorption characteristics of sound absorbing material)
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 1500 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.
Device name: 4206 type impedance tube (Brüel & Kjä)
Measurement method: Vertically incident sound absorption coefficient (based on JIS A 1405-1)
Measurement range: 50 to 1600 Hz
作製した各吸音材の垂直入射吸音率を、以下に従って測定した。樹脂フィルム側から音を入射した。５００～１５００Ｈｚにおける垂直入射吸音率の平均値を平均吸音率として算出し、比較例の平均吸音率を１００とした場合の比をその吸音材の吸音特性とした。結果を表３及び表４に示す。
装置名：４２０６型インピーダンス管（ブリュエル・ケアー社）
測定方法：垂直入射吸音率（ＪＩＳ Ａ １４０５－１に準拠）
測定範囲：５０～１６００Ｈｚ (Evaluation of sound absorption characteristics of sound absorbing material)
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 1500 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.
Device name: 4206 type impedance tube (Brüel & Kjä)
Measurement method: Vertically incident sound absorption coefficient (based on JIS A 1405-1)
Measurement range: 50 to 1600 Hz
図２及び図４、並びに図３及び図５は、それぞれ実施例及び比較例の垂直入射吸音率を示す図である。同図に示されるように、第一基材層の密度が第二基材層の密度よりも高い構成を有する吸音材は、当該構成を有しない吸音材に比して広い周波数領域における吸音特性に優れることが分かる。
2 and 4, and 3 and 5 are diagrams showing the vertical incident sound absorption coefficient of Examples and Comparative Examples, respectively. As shown in the figure, the 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 wider frequency range than the sound absorbing material having no such structure. It turns out that it is excellent.
１…樹脂フィルム、２…連通孔を有する第一基材層、３…連通孔を有する第二基材層、１０…吸音材。
1 ... Resin film, 2 ... First base material layer having communication holes, 3 ... Second base material layer having communication holes, 10 ... Sound absorbing material.
1 ... Resin film, 2 ... First base material layer having communication holes, 3 ... Second base material layer having communication holes, 10 ... Sound absorbing material.
Claims (13)
- 樹脂フィルムと、連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備え、
前記第一基材層の密度が、前記第二基材層の密度よりも低い、吸音材。 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.
A sound absorbing material in which the density of the first base material layer is lower than the density of the second base material layer. - 前記第一基材層の通気抵抗が、前記第二基材層の通気抵抗よりも低い、請求項１に記載の吸音材。 The sound absorbing material according to claim 1, wherein the ventilation resistance of the first base material layer is lower than the ventilation resistance of the second base material layer.
- 前記第一基材層及び前記第二基材層が、樹脂発泡体又は不織布である、請求項１又は２に記載の吸音材。 The sound absorbing material according to claim 1 or 2, wherein the first base material layer and the second base material layer are resin foams or non-woven fabrics.
- 前記第一基材層の厚さが、前記第二基材層の厚さよりも薄い、請求項１～３のいずれか一項に記載の吸音材。 The sound absorbing material according to any one of claims 1 to 3, wherein the thickness of the first base material layer is thinner than the thickness of the second base material layer.
- 前記樹脂フィルムが、ポリオレフィン、ポリエステル又はポリアミドから構成される、請求項１～４のいずれか一項に記載の吸音材。 The sound absorbing material according to any one of claims 1 to 4, wherein the resin film is composed of polyolefin, polyester or polyamide.
- 前記樹脂フィルムの少なくともいずれかの表面に、金属蒸着層をさらに備える、請求項１～５のいずれか一項に記載の吸音材。 The sound absorbing material according to any one of claims 1 to 5, further comprising a metal vapor deposition layer on at least one surface of the resin film.
- 前記樹脂フィルム及び前記第一基材層間、並びに前記第一基材層及び前記第二基材層間の少なくともいずれかに、接着剤層をさらに備える、請求項１～６のいずれか一項に記載の吸音材。 The invention according to any one of claims 1 to 6, further comprising an adhesive layer between the resin film and the first base material layer, and at least one of the first base material layer and the second base material layer. Sound absorbing material.
- 前記第一基材層の密度が、０．００５～０．２０ｇ／ｃｍ３であり、前記第二基材層の密度が、０．０１５～０．３０ｇ／ｃｍ３である、請求項１～６のいずれか一項に記載の吸音材。 The first base material layer has a density of 0.005 to 0.20 g / cm 3 , and the second base material layer has a density of 0.015 to 0.30 g / cm 3. The sound absorbing material according to any one of 6.
- 前記第一基材層の通気抵抗が、０．００３～０．４５ｋＰａ・ｓ／ｍであり、前記第二基材層の通気抵抗が、０．０２～０．５ｋＰａ・ｓ／ｍである、請求項１～８のいずれか一項に記載の吸音材。 The ventilation resistance of the first base material layer is 0.003 to 0.45 kPa · s / m, and the ventilation resistance of the second base material layer is 0.02 to 0.5 kPa · s / m. The sound absorbing material according to any one of claims 1 to 8.
- 厚さが１～１００ｍｍである、請求項１～９のいずれか一項に記載の吸音材。 The sound absorbing material according to any one of claims 1 to 9, which has a thickness of 1 to 100 mm.
- 連通孔を有する第一基材層と、連通孔を有する第二基材層と、をこの順に備え、
前記第一基材層の密度が、前記第二基材層の密度よりも低く、
前記第一基材層側が音の入射方向となるように用いられる、吸音性向上部材。 A first base material layer having communication holes and a second base material layer having communication holes are provided in this order.
The density of the first base material layer is lower than the density of the second base material layer,
A sound absorption improving member used so that the first base material layer side is the incident direction of sound. - 前記第一基材層の通気抵抗が、前記第二基材層の通気抵抗よりも低い、請求項１１に記載の吸音性向上部材。 The sound absorbing property improving member according to claim 11, wherein the ventilation resistance of the first base material layer is lower than the ventilation resistance of the second base material layer.
- 請求項１～１０のいずれか一項に記載の吸音材を備える、車両部材。
A vehicle member comprising the sound absorbing material according to any one of claims 1 to 10.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024105489A1 (en) * | 2022-11-18 | 2024-05-23 | 3M Innovative Properties Company | Acoustic article |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002215169A (en) * | 2001-01-18 | 2002-07-31 | Kasai Kogyo Co Ltd | Acoustic material for vehicle |
| JP2007086505A (en) * | 2005-09-22 | 2007-04-05 | Du Pont Toray Co Ltd | Sound absorbing and insulating material |
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2021
- 2021-03-09 WO PCT/JP2021/009286 patent/WO2021182468A1/en active Application Filing
- 2021-03-09 TW TW110108371A patent/TW202136036A/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002215169A (en) * | 2001-01-18 | 2002-07-31 | Kasai Kogyo Co Ltd | Acoustic material for vehicle |
| JP2007086505A (en) * | 2005-09-22 | 2007-04-05 | Du Pont Toray Co Ltd | Sound absorbing and insulating material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024105489A1 (en) * | 2022-11-18 | 2024-05-23 | 3M Innovative Properties Company | Acoustic article |
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| JPWO2021182468A1 (en) | 2021-09-16 |
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