WO2009125742A1 - Structure composite absorbant les sons - Google Patents

Structure composite absorbant les sons Download PDF

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Publication number
WO2009125742A1
WO2009125742A1 PCT/JP2009/057058 JP2009057058W WO2009125742A1 WO 2009125742 A1 WO2009125742 A1 WO 2009125742A1 JP 2009057058 W JP2009057058 W JP 2009057058W WO 2009125742 A1 WO2009125742 A1 WO 2009125742A1
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Prior art keywords
sound absorbing
skin layer
layer
absorbing structure
flow resistance
Prior art date
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PCT/JP2009/057058
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English (en)
Japanese (ja)
Inventor
一嘉 飯田
青滋 霊田
亮一 和田
Original Assignee
ブリヂストンケービージー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by ブリヂストンケービージー株式会社 filed Critical ブリヂストンケービージー株式会社
Priority to CN200980112651.7A priority Critical patent/CN101999145B/zh
Priority to JP2010507233A priority patent/JP5501959B2/ja
Publication of WO2009125742A1 publication Critical patent/WO2009125742A1/fr

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    • 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
    • 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
    • B32B5/02—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 structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • 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
    • B32B5/22—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • 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
    • B32B2509/00—Household appliances
    • 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
    • B32B2605/00—Vehicles

Definitions

  • the present invention relates to a novel invention relating to a sound absorbing structure using a fibrous porous material.
  • polyester fiber-based sound absorbing materials are the most commonly used as a base material.
  • Glass wool has long been preferred as a fiber-based sound absorbing material
  • polyester fiber-based sound absorbing materials have been used because of environmental problems, recycling, sound absorbing performance, work environment preservation, long-term durability, and the like.
  • this polyester fiber-based sound absorbing material is treated with a non-woven fabric composed of polyester fibers to adjust the water repellency, durability, and sound absorbing properties, and the heat-melt material is heat-sealed to the base material layer. It is used by arranging the side surface on the sound incident side.
  • flow resistance due to the base material layer and the skin layer is adjusted to provide sound absorption characteristics
  • practical use such as strength, durability, processability, etc.
  • sound absorption performance there are problems in terms of sound absorption performance as well, but in terms of sound absorption performance, there is a limit in trying to obtain higher sound absorption performance within a certain limited thickness. was there.
  • porous materials such as glass wool and polyester fibers exhibit sound absorption properties because sound waves incident from the surface of the porous material vibrate air in a three-dimensionally formed interstice between fibers.
  • viscous resistance is generated, and incident acoustic energy is consumed as heat energy, and as a result, it is the main sound absorption mechanism that reflected acoustic energy is suppressed.
  • the unit area flow resistance is defined by the following equation from the velocity when a constant minute air flow V flows in the direction perpendicular to the surface of the material and the pressure difference between the two surfaces of the material.
  • R ⁇ P / (V ⁇ d)
  • ⁇ P Pressure difference between both sides of the material
  • V Air flow rate per unit area [m 3 / (m 2 / sec)]
  • d Thickness of sample (m)
  • the flow resistance of the composite determines the sound absorption coefficient of the sound absorbing material.
  • This flow resistance is a: of the porous material which is a base material layer Changing the density, b: changing the diameter or blending ratio of fibers constituting the porous material, c: changing the fiber characteristics constituting the porous material, d: non-woven fabric of the skin layer (for example, spunbond) It can be controlled by changing characteristics and specifications, but at present it can not be said that it is optimized in the prior art.
  • the diameter of the single fiber constituting the nonwoven fabric of the skin layer is recommended to be 10 ⁇ m or less, preferably 5 ⁇ m or less (Japanese Patent No. 3494332).
  • Japanese Patent No. 3494332 Japanese Patent No. 3494332
  • it is easy to obtain the sound absorbing performance there are many extremely inconvenient aspects such as strength, durability, composite manufacture with the base material layer, and difficulty in handling on a processed surface (such as wrinkles) in practical use.
  • a film structure may be inserted or formed between the surface layer and the base material layer, and the sound absorption performance in the middle and low frequency bands is considerable. Although it improves, on the other hand, the sound absorption performance in the high frequency band generally decreases, and it is not suitable for the purpose of improving the sound absorption performance in a wide frequency band from the middle and low frequency bands to the high frequency band.
  • the present invention has been made in view of the prior art as described above, and its object is to use a non-woven fabric using a specific single fiber diameter, and a skin layer and polyester made of one or more non-woven fabric.
  • a porous sound absorbing material in which the sound absorbing performance is further improved in a wide frequency band from low to high bands without complexing the fiber or the matrix layer mainly composed thereof and thickening the volume as a sound absorbing structure It is to provide at an appropriate cost.
  • the first aspect of the present invention is a composite integration of a skin layer on which at least one non-woven fabric of a polymeric material such as polyester, polyethylene, nylon, etc. is laminated, and a matrix layer mainly composed of a porous polymer fiber material.
  • the composite sound absorbing structure is characterized in that the unit area flow resistance of the composite of the skin layer and the base material layer is preferably 1 ⁇ 10 4 to 7 ⁇ 10 4 N ⁇ sec / m 4 .
  • the polymer fiber-based porous material of the matrix layer is mainly made of polyester fibers, and the orientation of this material is either longitudinal orientation, transverse orientation, or irregular orientation.
  • the polymer fiber-based porous material is a melt fiber having a melting point at 100 to 200 ° C. and one having a fiber diameter of 2 to 20 denier appropriately mixed to have an area density of 500 to 2500 g / m 2 integrally.
  • a heat-molded product is exemplified, and the unit area flow resistance of the base material layer is 0.5 ⁇ 10 4 to 3.5 ⁇ 10 4 N ⁇ sec / m 4 .
  • the nonwoven fabric used for the skin layer has a cross-sectional shape of single fiber of circular or flat shape, equivalent single fiber diameter is 11 to 35 ⁇ m, and area density is 50 to 130 g / m 2 Or a single layer of non-woven fabric which is coated or transferred in advance, or two or more non-woven fabrics are laminated and heat-sealed to form a single-layer non-woven fabric.
  • the unit area flow resistance of the skin layer is 3.5 ⁇ 10 5 to 7 ⁇ 10 6 N ⁇ sec / m 4 .
  • the non-woven fabric is, of course, the same type but it is also possible to use different types.
  • polyester, polyethylene or nylon having a basis weight of 20 to 120 g / m 2 is selected.
  • the second composite sound absorbing structure of the present invention is characterized in that the first invention is further characterized, and it comprises an outer skin layer made of a non-woven fabric of a polymeric material and a matrix layer made of a porous polymer fiber material.
  • a composite sound absorbing structure in which a skin layer of a non-woven fabric is disposed on the incident side of sound, and the skin layer is A non-woven fabric selected from polyester, polyethylene, and nylon with a cross-sectional shape of single fiber of circular or flat shape, equivalent single fiber diameter of 11 to 35 ⁇ m, and surface density of 50 to 130 g / m 2.
  • a hot melt material selected from powdery or comb-like (network) shape of 20 to 120 g / m 2 and having a unit area flow resistance of 3 .5 ⁇ 10 5 to 7 ⁇ 10 6 N ⁇ sec / m 4, and the matrix layer is a polymeric fiber-based porous material mainly composed of polyester fibers, It is a base material layer having a unit area flow resistance of 0.5 ⁇ 10 4 to 3.5 ⁇ 10 4 N ⁇ sec / m 4 , and a unit area flow resistance of the obtained composite is 1 ⁇ 10 4 to 7 ⁇ It is a composite sound absorbing structure adjusted to be 10 4 N ⁇ sec / m 4 .
  • the skin layer is preferably formed by laminating two or more non-woven fabrics on which a hot melt material such as powdery or comb-like (reticulated) is previously applied or transferred on the back surface and integrated by heat fusion.
  • the present invention is, for example, a polyester fiber-based sound absorbing material with good sound absorbing performance, which comprises a non-woven fabric to be a skin layer with a single fiber diameter of 11 ⁇ m or more, withstands practical use, and meets needs such as weight reduction and space narrowing.
  • a polyester fiber-based sound absorbing material with good sound absorbing performance which comprises a non-woven fabric to be a skin layer with a single fiber diameter of 11 ⁇ m or more, withstands practical use, and meets needs such as weight reduction and space narrowing.
  • the present invention can be applied in the field of (1), and can provide a sound absorbing material excellent in sound absorbing characteristics with a thickness reduced as much as possible.
  • FIG. It is the schematic which shows the state which attached the sound absorbing material A to the rigid wall surface P.
  • FIG. It is a perspective view showing the 1st example of the compound sound absorption structure of the present invention. It is a perspective view which shows the 2nd example of the compound sound absorption structure of this invention.
  • (B) Composite sound absorbing structure having a skin layer formed by stacking two different non-woven fabrics It is a graph which shows the sound absorption performance of samples A and B. It is a graph which shows the sound absorption performance of sample A, B, C1. It is a graph which shows the sound absorption performance of sample B, BC, and BS. It is a graph which shows the sound absorption performance of sample B, C2, and D. It is a graph which shows the sound absorption performance of sample B, B25-3. It is a graph which shows the sound absorption performance of sample B25-2.
  • Japanese Patent No. 3494332 has already been present as a sound absorbing material composed of the non-woven fabric of the skin layer and the matrix layer.
  • the diameter of the single fiber constituting the skin layer is preferably 10 ⁇ m or less, preferably 5 ⁇ m or less.
  • the fiber diameter is thin, the flow resistance is increased, so it can be said that the sound absorbing performance is relatively improved, but practically, the strength, the durability, the composite production with the base material layer, the processed surface
  • the nonwoven fabric of the skin layer is composited with the base material layer by hot melt, the fiber diameter is small, and clogging easily occurs. For this reason, the sound absorption coefficient tends to decrease in the high tone range, and there is a problem that the data is easily changed by a small amount.
  • the present invention is intended to provide a highly practicable structure as a sound absorbing material, and is excellent in practicality as a non-woven fabric of the skin layer, good in availability, and preferably inexpensive.
  • the sound absorption characteristics can be greatly improved by applying a special method to the surface layer when composited with the base material layer, using a single fiber diameter of 11 to 35 ⁇ m, and a superior and inexpensive composite sound absorption It is possible to provide a structure.
  • the main part of the technology of the present invention is a polyester fiber or a nonwoven fabric having a single fiber diameter of 11 to 35 ⁇ m which can withstand practical use, such as good strength, durability, processability and appearance as a skin layer. It is possible to obtain stable sound absorption characteristics from middle to low frequency bands to high frequency bands by devising a method of combining with a base material mainly composed of It is in.
  • the flow resistance of the composite structure of the skin layer and the base material is 1 ⁇ 10 4 to 7 ⁇ 10 4 is N ⁇ sec / m 4, particularly draws excellent sound absorbing performance in a wide band, preferably the flow resistance of the complex 2 ⁇ 10 4 ⁇ 3.5 ⁇ 10 4 N ⁇ sec / m 4 It has been found that it is extremely effective to achieve the object to achieve the object, and the present invention has been made. As a sound absorbing material, the flow resistance when made into a composite is important, but even in that case, it is more effective to improve the sound absorbing performance by adjusting the flow resistance in the skin layer.
  • the constituent material of the invention is mainly a polyester fiber material, which exhibits a novel, wide band and excellent sound absorbing performance, is highly practical in strength, durability, economy and the like, and is recyclable, environmental protection, safety And so on. The same effect can be obtained with other polymer fiber materials such as polyethylene and nylon.
  • the basic configuration of the invention is a sound absorbing structure in which a skin layer (spun-bonded non-woven fabric) and a base material are heated and pressed through a hot melt material (hower-like, spider-like, etc.) to form a composite.
  • the spunbonded nonwoven fabric constituting the skin layer is one having a single fiber diameter or an equivalent single fiber diameter of 11 to 35 ⁇ m, The practicality is particularly high around 15 ⁇ m. If the fiber diameter is 10 ⁇ m or less, it is thin, and wrinkles etc. are easily generated when combined with the base material layer, and handling and processability are not good, and if it exceeds 35 ⁇ m, the nonwoven fabric feels fluffy and the base material The rigidity after compounding with the layer is increased, and the adaptability becomes worse when being made to follow a curved surface part or the like.
  • Flow resistance adjustment means 1 As a skin layer, a polymeric hot melt material with a basis weight (weight per unit area) of 20 to 120 g / m 2 is applied or transferred to the back of one spun bond nonwoven fabric and disposed on the base material layer, Heat and pressure are adjusted to adjust the integrated combined flow resistance to a desired value.
  • Flow resistance adjustment means 2 Two or more spun bond non-woven fabrics are laminated as a skin layer, placed on a base material layer, heated and pressed, and integrated so that the flow resistance after combined becomes a desired value.
  • the plurality of spunbonded nonwoven fabrics may have the same specifications or may have different specifications in combination.
  • the number of two spunbond nonwoven fabrics on the top of the skin layer is a fiber whose cross section is circular (area density 100 g / m 2 , single fiber diameter 15 ⁇ m), and the second spunbond nonwoven fabric is a fiber
  • Two different spunbond non-woven fabrics having a flat cross section area density 90 g / m 2 , equivalent single fiber diameter 14.5 ⁇ m) superimposed on a base material, heated and pressed, and composited; If the composite sound absorbing structure has a value of 2.7 ⁇ 10 4 N ⁇ sec / m 4 , excellent sound absorbing performance can be obtained in a wide frequency band.
  • fiber diameters other than those specified in the present invention can be used as nonwoven fabrics other than the skin layer.
  • FIG. 1 shows a state in which a sound absorbing material A made of a porous material is attached to a hard wall surface P.
  • Reference numeral 1 denotes a skin layer
  • 2 denotes a base material layer
  • 3 denotes a hot melt material for integrating the two.
  • the velocity of the air particles is maximum at 40 mm or more, so adjusting the flow resistance with the skin layer 1 up to about 40 mm thick is more viscous By the resistance, the conversion efficiency from acoustic reflection energy to heat energy becomes high, and the sound absorption performance can be efficiently enhanced.
  • FIG. 2 is a sound absorbing material shown in FIG. 2, which is a single layer non-woven fabric used for the skin layer 1, that is, the cross section of single fiber is circular or flat.
  • the hot melt material 3 is previously applied or transferred, and the flow resistance as the skin layer is a combination such that 3.5 ⁇ 10 5 to 7 ⁇ 10 6 N ⁇ sec / m 4 .
  • the base material layer 2 is a non-woven fabric mainly composed of polyester fibers, and has a flow resistance of 0.5 ⁇ 10 4 to 3.5 ⁇ 10 4 N ⁇ sec / m 4 .
  • a hot melt material such as powdery or comb-like (mesh) shape is applied or transferred in advance to the back surface of the non-woven fabric, and the application or transfer amount is adjusted with a fabric weight of 20 to 120 g / m 2 It will be.
  • the skin layer 1 and the base material layer 2 are stacked via the hot melt material 3, heated and pressed, and the two are thermally fused to form an integral composite, and the flow resistance as a composite is 1 ⁇ 10 4 It is a sound absorbing structure set to 7 to 10 ⁇ 10 4 N ⁇ sec / m 4 .
  • the flow resistance may be adjusted to 2 ⁇ 10 4 to 3.5 ⁇ 10 4 N ⁇ sec / m 4 .
  • FIG. 3 a flow resistance of 0.5 ⁇ 10 4 to 3.5 ⁇ 10 4 N ⁇ sec / m 4 .
  • the back surface of a base material layer 2 made of a polymer fiber-based porous material and a non-woven fabric 1 having a single fiber with a circular or flat cross section and an equivalent single fiber diameter of 11 to 35 ⁇ m and a surface density of 50 to 130 g / m 2 2 or more sheets in the example shown in FIG. 3 (A), the same non-woven fabric as described in FIG. 2 is used).
  • the flow resistance of the skin layer 1 is 3.5 ⁇ 10 5 to 7 ⁇ 10 6 N ⁇ sec / m 4 when the sheets (1a, 1b, 1c) are stacked and integrated by heat fusion into multiple layers. It is a non-woven fabric adjusted. Then, the two are stacked, heated and pressurized, and heat fusion integrated into a composite, so that the flow resistance as the composite is 1 ⁇ 10 4 to 7 ⁇ 10 4 N ⁇ sec / m 4 to increase the sound absorption coefficient. Sound absorption structure.
  • the surface layer 1 is used on the sound incident side.
  • non-woven fabrics it is also possible to use different types of non-woven fabrics as the skin layer 1, and the composite shown in FIG. 3B uses the same non-woven fabric 1a as the non-woven fabric described in FIG.
  • an example 1d one having a flat cross section, an equivalent single fiber diameter of 11 to 35 ⁇ m, and an area density of 50 to 130 g / m 2 and using the same hot melt treatment on the back surface is used.
  • Sound absorbing structure A composed only of matrix layer 2 (bulk density 44 kg / m 3 , thickness 35 mm, flow resistance 1 ⁇ 10 4 N ⁇ sec / m 4 ) composed of polyester fiber, and the product of the present invention Using a spunbond non-woven fabric (area density 100 g / m 2 ) 1 composed of a polyester fiber system having a single fiber diameter of about 15 ⁇ m, and applying a powdery hot melt material (20 g / m 2 basis weight) on the back side;
  • the composite sound absorbing structure B (flow resistance: 1.5 ⁇ 10 4 N ⁇ sec / m 4 ) is shown in comparison with the base material layer 2 of (1) by overlapping, heating and pressurizing, and integrated.
  • FIG. 4 is a graph showing the sound absorption performance of the two samples A and B described above. Even in the case of the product B of the present invention, even when using a polyester fiber non-woven fabric having a fiber thickness of 15 ⁇ m which is practically sufficient for single fiber diameter, it is appropriately treated and composited with an appropriate matrix layer 2 It proves that it is possible to obtain a large sound absorption performance if it is done.
  • This sound absorbing performance is, for example, comparable to glass wool (bulk density 32 kg / m 3 , thickness 40 to 50 mm) which is normally used as a sound absorbing material.
  • the sound absorption performance is shown by the measurement by the normal incidence method (ISO 10543 ⁇ 2).
  • the powdery hot-melt material of sample B shown in FIG. 4 is doubled in weight (40 g / m 2 basis weight) and one sample of sample A is composited, and the flow resistance of the composite is 3
  • the sound absorption performance of the composite sound absorption structure C1 with 2 ⁇ 10 4 N ⁇ sec / m 4 is shown by comparison, but the sound absorption performance in the middle and low frequency bands is significantly improved compared to Sample A. I understand.
  • the flow resistance of the composite sound absorbing structure is 3 ⁇ 10 4 N ⁇ sec / m by the application amount of the hot melt material on the back surface.
  • excellent sound absorption characteristics can be obtained in a wide frequency band.
  • the flow resistance is further increased, it is also possible to shift to the low frequency side.
  • the present invention demonstrates the superiority, flexibility, and applicability of the present invention which is extremely practical and still provides excellent sound absorption performance.
  • the flow resistance of the composite sound absorption structure is adjusted.
  • the skin layer 1 and the base material layer are more than inserting the spunbond non-woven fabric 1 (the same as the skin layer 1 of sample B and the same hot melt treatment) in the middle of the base material layer 2 even with almost the same flow resistance. It is shown that it is more effective to insert between the two and increase the flow resistance of the skin layer 1.
  • sample BC is a composite sound absorbing structure in which the same spunbond nonwoven fabric as the skin layer is inserted in the center of the base material of sample B, and the flow resistance of the composite is 2.0 ⁇ 10 4 N ⁇ sec / m It was four .
  • Sample BS is a composite sound absorbing structure in which the same spunbond non-woven fabric as the skin layer is inserted between the surface layer of sample B and the base material, and the two sheets are laminated, and the flow resistance of the composite is 2.2 ⁇ It was 10 4 N ⁇ sec / m 4 .
  • the composite sound absorbing structure D is a structure in which four sheets of the same spunbond non-woven fabric are inserted and the flow resistance as the composite sound absorber is 3.9 ⁇ 10 4 N ⁇ sec / m 4. Although the performance is improved, the sound absorption coefficient in the band of 630 Hz or higher tends to decrease.
  • the adjustment range of the flow resistance as a practical composite sound absorbing structure is 1 ⁇ 10 4 to 7 ⁇ 10 4 N ⁇ sec / m 4 , and 2 ⁇ 10 4 to improve sound absorbing performance in a wide band. It is desirable that the value be 3.5 to 10 4 N ⁇ sec / m 4 .
  • the flow resistance may be adjusted in the range of 1 ⁇ 10 4 to 7 ⁇ 10 4 N ⁇ sec / m 4 . That is, the flow resistance is increased to improve the low frequency sound absorption performance, and the flow resistance is decreased to improve the high frequency sound absorption performance. This is true of the other method described above.
  • an appropriate base material can be selected, and thereafter, the skin layer can adjust the flow resistance of the composite sound absorbing structure to provide a sound absorbing material having appropriate sound absorbing performance. became.
  • Solid absorption test 4 In the sound absorption test 1, a composite sound absorption structure is formed by adjusting the flow resistance with the application amount of the hot melt material for compounding with the base material on the back surface of one spun bond nonwoven fabric forming the skin layer of the present invention In 2 and 3, two or more spunbond non-woven fabrics (on the back surface coated with a hot melt material) that form the skin layer are laminated on the base material to form a composite sound absorbing structure with flow resistance adjusted. In particular, if the flow resistance of the composite sound absorbing structure is adjusted to 2 ⁇ 10 4 to 3.5 ⁇ 10 4 N ⁇ sec / m 4 , excellent sound absorbing performance can be obtained in a wide range from low frequency band to high frequency band.
  • the sample B according to the present invention which is an example of the present invention, is comparable to the commonly used glass wool (bulk density 32 kg / m 3 , thickness 40 to 50 mm).
  • Composite sound absorbing structure sample B25-3 (flow resistance 2.6) obtained by overlapping the skin layer with three same spunbond nonwoven fabrics on the same base material (thickness 25 mm) as sample B by applying one of the methods described above Sound absorption performance equal to or higher than 10 4 N ⁇ sec / m 4 ) can be obtained, which can be said to show a great advantage of the present invention. This will be able to provide sound absorbing materials with a good space factor, and will also meet the needs of society.
  • the flow resistance of the sample B25-3 and the sample B25-2 as a composite sound absorbing structure is adjusted to 2.6 ⁇ 10 4 N ⁇ sec / m 4 as the former, By adjusting the latter to approximately the same 2.7 ⁇ 10 4 N ⁇ sec / m 4 , the two can obtain approximately the same sound absorption performance (the latter slightly exceeds), and different spunbond nonwoven fabrics as the skin layer By combining the two, it is possible to provide a sound absorbing material which is even more superior to the sample B25-3 even with two spunbonded nonwoven fabrics. This not only excels in practical strength and sound absorption performance in a wide frequency band, but also contributes to economy.
  • the material used in the present invention is excellent in recyclability and environment because both the skin layer and the base material use a polyester fiber system as a standard.
  • the present invention can provide a highly practical sound absorbing material having a thin thickness, a wide band, and high sound absorbing performance as compared with the conventional porous sound absorbing material.
  • the composite sound absorbing structure of the present invention is superior in weight reduction, recyclability, economy, environmental conservation, etc., and has high versatility, so it can be used in construction machinery, agricultural machinery, pneumatic machinery and other industries. It can be used in a wide range of fields, including civil engineering, such as fields, railways, roads, and various construction works, construction fields, and home appliances.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention porte sur une structure composite absorbant les sons, obtenue par la combinaison et la réunion d'une couche de peau constituée d'une couche ou de deux couches, ou plus, superposées d'un tissu non tissé comportant un matériau polymère, par exemple un polyester, du polyéthylène, ou du nylon, et ayant un diamètre de 11 à 35 μm, exprimé par le diamètre de fibre individuelle équivalent (résistance à l'écoulement, 3,5 × 105 à 7 × 106 N⋅s/m4), avec une couche de base consistant essentiellement en un matériau poreux constitué de fibres polymères (résistance à l'écoulement, 0,5 × 104 à 3,5 × 104 N⋅s/m4). Ce composite présente une résistance à l'écoulement par unité de surface de 1 × 104 à 7 × 104 N⋅s/m4.
PCT/JP2009/057058 2008-04-10 2009-04-06 Structure composite absorbant les sons WO2009125742A1 (fr)

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JP2011241550A (ja) * 2010-05-14 2011-12-01 Railway Technical Research Institute 軌道面吸音構造及びこれに用いる多層吸音材の成型法
EP2754967A1 (fr) * 2013-01-11 2014-07-16 Miele & Cie. KG Hotte aspirante
JP2014529524A (ja) * 2011-08-25 2014-11-13 サン−ゴバンアドフォル 熱及び音響快適性のための壁面被覆
EP3203467A4 (fr) * 2014-09-30 2018-06-13 Compagnie Générale des Etablissements Michelin Corps absorbant acoustique
JP2019516890A (ja) * 2016-05-13 2019-06-20 リアヴェル ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフトＬＩＡＶＥＲ ＧｍｂＨ ＆ ＣＯ． ＫＧ 吸音装置および防音部屋
CN109949787B (zh) * 2019-03-29 2024-04-30 保定市宏腾科技有限公司 一种pet吸音棉及其制备方法

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US9505359B2 (en) * 2013-04-26 2016-11-29 Autonetworks Technologies, Ltd. Sound-absorbing material and wire harness equipped with sound-absorbing material
DE102017126506A1 (de) * 2017-11-11 2019-05-16 Liaver Gmbh & Co. Kg Schallabsorberanordnung und Halle mit reduzierter Nachhallzeit
JP2019111714A (ja) * 2017-12-22 2019-07-11 Jnc株式会社 積層吸音材
JP6751278B1 (ja) * 2019-06-21 2020-09-02 Jnc株式会社 積層吸音材
TWI752540B (zh) * 2020-06-30 2022-01-11 國立成功大學 吸音裝置

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JP2011241550A (ja) * 2010-05-14 2011-12-01 Railway Technical Research Institute 軌道面吸音構造及びこれに用いる多層吸音材の成型法
JP2014529524A (ja) * 2011-08-25 2014-11-13 サン−ゴバンアドフォル 熱及び音響快適性のための壁面被覆
EP2754967A1 (fr) * 2013-01-11 2014-07-16 Miele & Cie. KG Hotte aspirante
EP3260782A1 (fr) * 2013-01-11 2017-12-27 Miele & Cie. KG Hotte aspirante
EP3203467A4 (fr) * 2014-09-30 2018-06-13 Compagnie Générale des Etablissements Michelin Corps absorbant acoustique
JP2019516890A (ja) * 2016-05-13 2019-06-20 リアヴェル ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフトＬＩＡＶＥＲ ＧｍｂＨ ＆ ＣＯ． ＫＧ 吸音装置および防音部屋
CN109949787B (zh) * 2019-03-29 2024-04-30 保定市宏腾科技有限公司 一种pet吸音棉及其制备方法

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