JP2017089227A - Sound absorbing laminate, and manufacturing method and mounting method or the same, sound absorbing unit for road including sound absorbing laminate, and building structure subjected to mounting of sound absorbing laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight sound absorbing laminate with high workability and maintainability.SOLUTION: A sound absorbing laminate according to the present disclosure includes a polyolefin nonwoven fabric layer, a sound absorbing material including polypropylene fibers, and a polypropylene substrate in this order. The sound absorbing material is sealed with the polyolefin nonwoven fabric layer and the polypropylene substrate at a peripheral edge of the polyolefin nonwoven fabric layer.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a sound-absorbing laminate, and more particularly to a sound-absorbing laminate for a road for absorbing noise generated due to traveling of a vehicle such as an automobile or a railway.

  For the purpose of reducing traffic noise generated by automobiles, trains, etc. traveling on elevated structures such as elevated roads and expressways, sound absorbing structures are installed on the undersides of these elevated structures. A conventional sound absorbing structure is composed of a metal plate such as a punched aluminum plate, a metal frame, and a sound absorbing material disposed therein, and mechanical means such as bolts and nuts are provided on the underside of the elevated structure. Attached using.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-155711) states that “the back plate has side wall portions formed by bending downward on both sides in the longitudinal direction of the back surface portion, and there is no side wall on the short side. Or a part of the side wall is bent to a small width and formed in a downward groove shape as a whole, and the end plate forming the side wall in the lateral direction of the back plate has the same short side. It has a length equivalent to the side in the direction, is formed at a height equivalent to the side wall portions formed on both sides in the longitudinal direction of the back plate, and is integrally joined at the junction with the back plate A sound-absorbing material filled in a box-shaped container with an open bottom surface formed by the back plate and the end plate; a box-shaped container with an open bottom surface formed by the back plate and the end plate A plurality of louvers are attached via a plurality of louver holding members fixed to the lower surface portion of the When the back portion of the back plate, the elevated road back surface of the base material, and to be supported suspended by hanging means respectively, characterized, describes a flyover backside sound absorbing unit type louver system for board ".

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-265357) discloses a flame retardant fiber such as “3-30 denier vinylidene chloride-vinyl chloride copolymer fiber, acrylonitrile-vinyl chloride copolymer fiber, acrylonitrile-vinylidene chloride copolymer fiber”, and the like. A 3-30 denier polyester fiber substantially equal to the flame retardant fiber and a fiber having a melting point lower than that of the 3-30 denier flame retardant fiber substantially equal to the flame retardant fiber. "Sound absorbing member characterized in that synthetic fiber nonwoven fabric block formed by bonding flame retardant fiber and polyester fiber by melting fiber of melting point is used as sound absorbing material".

  Patent Document 3 (Japanese Patent Laid-Open No. 10-212710) states that “a wave-like sound absorbing layer 22 that continuously undulates on the surface of the flat plate-like sound absorbing layer 21 is formed, and the wave-like sound absorbing layer 22 is applied to the running surface. "Sound absorbing structure for roads characterized by being installed on the side".

  Patent Document 4 (Japanese Patent Application Laid-Open No. 11-006222) states that “a sound absorbing structure unit composed of a hollow frame body and a sound absorbing material disposed in the hollow portion, and the hollow frame body has a cross section perpendicular to the longitudinal direction. And a perforated plate portion that covers at least the front side of the sound absorbing material. The hollow portion is constituted by the frame portion and the perforated plate portion, and the sound absorbing material. Describes a sound-absorbing structure unit characterized in that the front side has a convex shape and the perforated plate portion has a convex shape corresponding to the shape.

JP 2003-155711 A JP 2001-265357 A Japanese Patent Laid-Open No. 10-212710 JP-A-11-006222

A conventional sound absorbing structure is a heavy object including a metal frame as a component. For example, the weight of the sound absorbing structure is 10 kg or more per 1 m ² of the mounting surface, and therefore, periodic inspection is required to prevent accidents caused by dropping. However, when floor boards and main girders such as elevated roads and highways have a precast structure, it is not possible to secure a space such as a walkway for performing maintenance and inspection of the attachment part (hanging part) of the sound absorbing structure. It was difficult to visually inspect such an attachment part.

  In view of the above problems, the present disclosure provides a sound-absorbing laminate that is lightweight and has high workability and maintainability.

  According to one embodiment of the present disclosure, a sound-absorbing laminate including a polyolefin nonwoven fabric layer, a sound-absorbing material containing polypropylene fibers, and a polypropylene support in this order, wherein the sound-absorbing material is a peripheral portion of the polyolefin nonwoven fabric layer. A sound-absorbing laminate that is sealed with the polyolefin nonwoven fabric layer and the polypropylene support is provided.

  According to another embodiment of the present disclosure, a road sound absorption unit including the sound absorption laminate is provided.

  According to still another embodiment of the present disclosure, a polyolefin nonwoven fabric layer, a sound absorbing material including polypropylene fibers, and a polypropylene support are provided. The polyolefin nonwoven fabric layer, the sound absorbing material, and the polypropylene support are combined with each other. Sound-absorbing lamination, comprising stacking in order, welding the polyolefin nonwoven fabric layer and the polypropylene support at the periphery of the polyolefin nonwoven fabric, and sealing the sound-absorbing material with the polyolefin nonwoven fabric layer and the polypropylene support A method of manufacturing a body is provided.

  According to still another embodiment of the present disclosure, there is provided a method for attaching a sound absorbing laminate to a building structure, including preparing the sound absorbing laminate and attaching the sound absorbing laminate to a building structure, The sound absorbing laminate is attached to the building structure by (a) attaching the surface of the polypropylene support opposite to the sound absorbing material and the surface of the building structure to an adhesive, a double-sided tape, and a mechanical fastener. (B) attaching a set of rails to the building structure, and inserting the sound absorbing laminate between the set of rails; (c) attaching the sound absorbing laminate to the building structure; A method for attaching a sound absorbing laminate to a building structure is provided, which is performed by any one or combination of fixing to a building structure using screws or bolts and nuts.

  According to still another embodiment of the present disclosure, a building structure to which the sound absorbing laminate is attached is provided.

  The sound-absorbing laminate of the present disclosure is significantly lighter than conventional sound-absorbing structures, and can greatly reduce the possibility of a serious accident even if the sound-absorbing laminate is dropped from the mounting portion. . Moreover, since the sound-absorbing laminate of the present disclosure is lightweight, for example, installation and removal at a high place are easy, and high workability and maintainability are provided.

  The above description should not be construed as disclosing all embodiments of the present invention and all advantages related to the present invention.

It is sectional drawing of the sound absorption laminated body of one embodiment of this indication. It is sectional drawing of the polypropylene support body which is a hollow structure comprised from a liner and a corrugated sheet core material. It is sectional drawing of the sound-absorption laminated body of another embodiment of this indication. It is sectional drawing of the sound-absorption laminated body of another embodiment of this indication. It is sectional drawing of the sound-absorption laminated body of another embodiment of this indication. It is a semi-logarithmic graph which shows the normal incidence sound absorption coefficient of the sound absorption laminated body of Examples 1-3 and the glass wool of the comparative example 1.

  Hereinafter, the present invention will be described in more detail for the purpose of illustrating representative embodiments of the present invention, but the present invention is not limited to these embodiments.

  The sound-absorbing laminate of one embodiment of the present disclosure includes a polyolefin nonwoven fabric layer, a sound-absorbing material containing polypropylene fibers, and a polypropylene support in this order. The sound absorbing material is sealed with a polyolefin nonwoven fabric layer and a polypropylene support at the peripheral edge of the polyolefin nonwoven fabric layer.

  A sound-absorbing laminate according to an embodiment of the present disclosure is shown in a cross-sectional view in FIG. A sound absorbing laminate 10 shown in FIG. 1 includes a polyolefin nonwoven fabric layer 12, a sound absorbing material 14 containing polypropylene fibers, and a polypropylene support 16 in this order, and the sound absorbing material 14 is a polyolefin nonwoven fabric at the periphery of the polyolefin nonwoven fabric layer 12. Sealed by layer 12 and polypropylene support 16. In FIG. 1, the sealing is shown as a sealing portion 18, whereby the sound absorbing material 14 is held between the polyolefin nonwoven fabric layer 12 and the polypropylene support 16.

  The polyolefin nonwoven fabric layer protects the sound absorbing material and suppresses reflection of sound incident on the sound absorbing laminated body and transmits the sound absorbing material. Since polyolefin has excellent chemical stability, the sound-absorbing laminate of the present disclosure in which the sound-absorbing material is protected by a polyolefin nonwoven fabric layer is used for a long period of time when it is attached to a building structure. High durability against exposure to corrosive gases.

  The polyolefin nonwoven fabric layer includes fibers of polyolefin such as polyethylene (PE) and polypropylene (PP). Part of the polyolefin fibers may be melted and bonded to each other. You may use the binder for couple | bonding these polyolefin fibers as needed. Since the chemical properties are similar, the polyolefin nonwoven fabric layer can be easily welded to a polypropylene support and, if necessary, a sound absorbing material containing polypropylene fibers. It is particularly advantageous for increasing the welding strength that the polyolefin nonwoven fabric contains polypropylene fibers.

The basis weight of the polyolefin nonwoven fabric layer can generally be about 3 g / m ² or more, or about 7 g / m ² or more, about 100 g / m ² or less, or about 70 g / m ² or less. By adjusting the basis weight of the polyolefin nonwoven fabric layer to the above range, the sound absorbing material can be protected and appropriate sound absorbing properties can be imparted to the sound absorbing laminate.

  The thickness of the polyolefin nonwoven fabric layer can generally be about 25 μm or more, or about 100 μm or more, about 5 mm or less, about 1 mm or less, or about 0.5 mm or less. By setting the thickness of the polyolefin nonwoven fabric layer within the above range, the sound absorbing material can be protected and appropriate sound absorbing properties can be imparted to the sound absorbing laminate.

  In order to obtain a sound-absorbing laminate having high weather resistance, it is advantageous that the polyolefin nonwoven fabric layer contains a light stabilizer. Examples of the light stabilizer include an ultraviolet absorber (UVA) and a hindered amine light stabilizer (HALS). Examples of UVA include benzophenone, benzotriazole, cyanoacrylate, benzoate, and triazine UV absorbers.

  The polyolefin nonwoven fabric layer may include an ultraviolet shielding agent such as carbon black, titanium oxide, zinc oxide, cerium oxide. An ultraviolet shielding agent such as carbon black can be added to the polyolefin nonwoven fabric layer by, for example, kneading into the raw material polyolefin.

  The polyolefin nonwoven fabric layer may be subjected to water repellent treatment, oil repellent treatment, or flame retardant treatment. These treatments can be performed by applying a water repellent, an oil repellent, or a flame retardant, or kneading into a raw material polyolefin.

  Examples of the sound absorbing material containing polypropylene fibers include polypropylene fiber woven fabric, knitted fabric, and non-woven fabric. Since the polypropylene fiber has hydrophobicity, it is difficult for water to enter between the fibers, and the sound absorbing property of the sound absorbing laminate can be maintained during use.

It is advantageous to use a non-woven fabric as the sound absorbing material. Since the nonwoven fabric has a large surface area per unit volume or unit mass, it is lighter than other sound absorbing materials having the same thickness and exhibits excellent sound absorbing properties. The density of the nonwoven fabric is desirably about 5 mg / cm ³ or more, or about 10 mg / cm ³ or more, about 100 mg / cm ³ or less, or about 50 mg / cm ³ or less. By setting the density of the nonwoven fabric within the above range, sufficient sound absorbing performance can be imparted to the sound absorbing laminate.

  The thickness of the nonwoven can vary, but can generally be about 1 mm or more, or about 5 mm or more, about 50 mm or less, or about 100 mm or less. In order to exhibit high absorption characteristics in a low frequency range, it is advantageous to use a thicker nonwoven fabric.

  It is particularly advantageous to use a nonwoven fabric composed of polypropylene fibers and short fibers as the nonwoven fabric. Desirably, the polypropylene fiber is a polypropylene microfiber. The material constituting the short fiber can be selected from the group consisting of polyolefin, acrylic resin (for example, modacrylic), polyester, and a mixture thereof from the viewpoints of processability, availability of raw materials, environmental characteristics, and the like. It is advantageous in terms of sound absorption characteristics that the short fiber is a polyester short fiber. In order to achieve both lightness and bulkiness, the fiber diameter of the microfiber is preferably about 10 μm or less, and the fiber diameter of the short fiber is preferably about 10 μm or more, about 50 μm or less, or about 100 μm or less. An example of a nonwoven fabric composed of microfibers and short fibers as described above is not limited to the following, but is trade name Thinsulate (registered trademark) nonwoven fabric made by the meltblown method (3M Japan Co., Ltd., Tokyo, Japan). No. TAI-2047, TAI-1047, etc. of Shinagawa Ward). The fiber diameter of the microfiber contained in these nonwoven fabrics is about 1-4 micrometers, and the fiber diameter of a short fiber is about 20-30 micrometers.

  The polypropylene support seals the sound absorbing material together with the polyolefin nonwoven fabric layer, and protects the sound absorbing material from damage due to contact with the surface on which the sound absorbing laminate is placed. The thickness of the support is desirably about 300 μm or more, or about 750 μm or more, about 20 mm or less, or about 10 mm or less. By setting the thickness of the polypropylene support within the above range, the sound absorbing material can be sufficiently protected from the outside, and the sound absorbing laminated body can be made lightweight. When the sound-absorbing laminate is applied to a curved surface or the like, it is desirable that the support is deformable. For example, it is advantageous that the thickness of the support is about 5 mm or less. On the other hand, when the sound-absorbing laminate is attached to a high place, for example, it is desirable to improve the shape maintaining property of the sound-absorbing laminate using a support having sufficient rigidity. For example, the thickness of the support is about 750 μm or more and about 20 mm or less It is advantageous that

  The polypropylene support may be a solid sheet or a hollow structure having a liner and a corrugated core material joined to the liner. When a sound-absorbing laminate is attached to a surface having relatively fine irregularities, for example, a concrete surface using an adhesive or a double-sided tape, such a solid sheet having no in-plane directionality is used as a polypropylene support. Following the unevenness in all directions, the contact area between the polypropylene support and the installation surface can be increased, thereby improving the adhesive strength of the sound absorbing laminate. In this embodiment, the thickness of the solid sheet can generally be about 300 μm or more and about 3 mm or less.

  FIG. 2 shows a cross-sectional view of a polypropylene support 16 that is a hollow structure composed of liners 22 and 22 ′ and a corrugated core material 24. In FIG. 2, the corrugated core material 24 is sandwiched between and joined to two liners 22 and 24 '. However, even if one liner is provided and one side of the corrugated core material is not covered with the liner, Good. When a hollow structure composed of a corrugated core material and a single liner is used as a support, the liner is generally laminated so that the liner is located on the outside, that is, on the side opposite to the sound absorbing material. By using such a hollow structure, it is possible to improve the shape maintaining property of the sound absorbing laminate while minimizing the increase in the weight of the sound absorbing laminate.

  The sound absorbing material can be sealed using various means such as welding, adhesive, staple, and stitching. Since the polyolefin nonwoven fabric layer and the polypropylene support are composed of materials having similar chemical properties, other materials and parts are not required by using welding, for example, thermal welding, ultrasonic welding, or high-frequency welding. Can be sealed. Welding may be performed over the entire thickness of the polyolefin nonwoven layer and / or polypropylene support, or may be performed over a portion of the thickness. When sealing is performed by welding, the sound absorbing material may be welded and fixed to the polyolefin nonwoven fabric layer and / or the polypropylene support. In this embodiment, it is possible to prevent the sound absorbing material from being biased when the sound absorbing laminate is applied to a vertical surface or an inclined surface. FIG. 1 shows a state in which a polyolefin nonwoven fabric 12, a sound absorbing material 14, and a polypropylene support 16 are welded together at a sealing portion 18.

  The sound absorbing material is sealed at the peripheral edge of the polyolefin nonwoven fabric layer. The sealing portion may be disposed from the end to the inside of the polyolefin nonwoven fabric layer, for example, at a position of about 1 mm or more or about 5 mm or more, about 10 cm or less, or about 5 cm or less. The planar shape of the sound absorbing material may be completely sealed, that is, surrounded by a continuous sealing portion. For example, spot welding or adhesive may be used to intermittently surround the planar shape of the sound absorbing material. You may seal with discontinuous sealing parts, such as dot printing. The width of the sealing portion can be, for example, in a range of about 1 mm or more, or about 5 mm or more, about 10 mm or less, or about 20 mm or less.

  The sound absorbing laminate may have a frame structure surrounding the sound absorbing material. By imparting such a frame structure to the sound-absorbing laminate, the shape maintaining property of the sound-absorbing laminate can be further improved. The sound-absorbing laminate 10 shown in FIG. 3 has a frame structure 17 surrounding the planar shape of the sound-absorbing material 14 on the outer surface of the sealing portion 18 on the surface of the polypropylene support 16 on the sound-absorbing material 14 side. The frame structure 17 may be disposed on or inside the sealing portion 18. The frame structure 17 may be disposed on the surface of the polypropylene support 16 opposite to the sound absorbing material.

  The material constituting the frame structure may be various, and examples thereof include resins such as polyethylene, polypropylene, acrylic resin, and polyurethane, metals such as aluminum and steel plates, and the like. The shape of the member constituting the frame structure may vary, and examples include a plate, a rod, and a mesh.

  The frame structure may completely surround the planar shape of the sound absorbing material, or may be surrounded with a part of the planar shape of the sound absorbing material being opened. For example, when the sound absorbing material has a rectangular or square planar shape as a form surrounded by the frame structure in a state where a part of the periphery of the planar shape of the sound absorbing material is open, it corresponds to a pair of opposing sides. Arranging the frame structure as described above. By forming the sealing portion with sufficient strength, it can also function as a frame structure.

  The frame structure may be arranged so as to cover a part of the planar shape of the sound absorbing material. For example, a frame structure having a frame shape such as a lattice shape, a radial shape, a combination of concentric circles and a radial shape may be disposed on the polyolefin nonwoven fabric layer so as not to reduce the thickness of the sound absorbing material, thereby surrounding the sound absorbing material with the frame structure. Good.

  The sound absorbing material may include two or more sound absorbing material layers. The sound absorbing material layer may be the same or different in material and characteristics. In this embodiment, the low-frequency sound absorption characteristics of the sound-absorbing laminate can be improved by increasing the thickness of the sound-absorbing material. A nonwoven fabric layer may be disposed between the sound absorbing material layers. As the nonwoven fabric layer, for example, the above-described polyolefin nonwoven fabric layer can be used. In the sound-absorbing laminate 10 shown in FIG. 4, the sound-absorbing material 14 includes sound-absorbing material layers 15 and 15 ′, and these sound-absorbing material layers are separated by the nonwoven fabric layer 13. By separating the sound absorbing material layers 5 and 15 ′ by the nonwoven fabric layer 13 as described above, for example, when the sound absorbing laminated body 10 is placed downward, that is, the polyolefin nonwoven fabric layer 12 is on the lower side, the polyolefin nonwoven fabric layer 12 and The nonwoven fabric layer 13 supports the masses of the sound absorbing material layer 15 ′ and the sound absorbing material layer 15, respectively. Therefore, compared with the case where the nonwoven fabric layer 13 is not used, the thinner polyolefin nonwoven fabric layer 12 can be used, and the influence on the sound absorption characteristics of the sound absorbing laminate due to the polyolefin nonwoven fabric layer can be reduced. Further, in this embodiment, it is possible to prevent the sound absorbing material 14 from being biased, and as a result, the in-plane distribution of the sound absorbing characteristics of the sound absorbing laminate can be made more uniform.

  The sound-absorbing laminate may be provided with attachment means disposed on the surface of the polypropylene support opposite to the sound-absorbing material. Examples of the attachment means include an adhesive, a double-sided tape, and a mechanical fastener. It is advantageous that the adhesive or the adhesive layer of the double-sided tape contains an acrylic adhesive because of its high durability and weather resistance. When an adhesive or a double-sided tape is used as an attachment means on the surface of a polypropylene support, the support surface is usually primed and then applied to the primer-treated surface of the support. Mechanical fasteners are generally formed by meshing hooks and loops to form a mechanical bond, and one of hooks and loops can be placed on the surface of a polypropylene support using adhesive, double-sided tape, stitching, welding, etc. it can. In this case, the other of the hook and the loop is fixed to the surface of the building structure that is primed as necessary, for example, a concrete surface by using screws, bolts and nuts, adhesive, double-sided tape, and the like.

  A method for producing a sound-absorbing laminate according to an embodiment of the present disclosure provides a polyolefin nonwoven fabric layer, a sound-absorbing material including polypropylene fibers, and a polypropylene support; a polyolefin nonwoven fabric layer, a sound-absorbing material, and a polypropylene support. Stacking in order; welding the polyolefin nonwoven fabric layer and the polypropylene support at the peripheral edge of the polyolefin nonwoven fabric, and sealing the sound absorbing material with the polyolefin nonwoven fabric layer and the polypropylene support. The welding may be thermal welding, ultrasonic welding or high frequency welding as already described.

The planar shape and dimensions of the sound-absorbing laminate and the sound-absorbing material included in the sound-absorbing laminate can be variously designed in consideration of the required sound-absorbing characteristics, installation location, handling properties, and the like. The planar shape of the sound-absorbing laminate is desirably a shape that can be regularly arranged on a plane, such as a triangle, square, rectangle, or hexagon. The shape of the sound-absorbing laminate may be circular, elliptical, or indefinite. The area of the planar shape of the sound absorbing laminate can be, for example, about 0.01 m ² or more and about 10 m ² or less. The area of the planar shape of the sound absorbing laminate is about 0.01 m ² or more and about 1 m ² or less in one embodiment, about 0.25 m ² or more and about 5 m ² or less in another embodiment, In an embodiment, it is about 1 m ² or more and about 10 m ² or less.

  The planar shape of the sound absorbing material may also vary, and may be, for example, a triangle, a square, a rectangle, a polygon such as a hexagon, a circle, an ellipse, or an indefinite shape. The planar shape of the sound absorbing material and the planar shape of the sound absorbing laminate may be different. For example, the planar shape of the sound absorbing laminate may be a square, and the planar shape of the sound absorbing material may be a circle. However, it is desirable that the planar shape of the sound-absorbing material is substantially similar to that of the sound-absorbing laminate because the sound-absorbing efficiency per installation area of the sound-absorbing laminate can be increased.

  The area of the planar shape of the sound absorbing material is preferably about 50% or more, or about 75% or more and less than 100% of the planar shape area of the sound absorbing laminate. By setting the area of the planar shape of the sound absorbing material within the above range, the sound absorbing efficiency per installation area of the sound absorbing laminate can be made sufficient.

The mass per unit area of the sound-absorbing laminate is a value obtained by dividing the mass of the entire sound-absorbing laminate by the area of the planar shape of the sound-absorbing laminate, and is generally about 100 g / m ² or more, or about 300 g / m ^2. above, it may be about 10000 g / ^{m 2} or less, or about 7000 g / ^{m 2} or less.

  The sound absorbing laminate is used by being attached to a building structure. The sound absorbing laminate is attached to the building structure by: (a) at least one of an adhesive, a double-sided tape, and a mechanical fastener, the surface of the polypropylene support opposite to the sound absorbing material and the surface of the building structure. (B) A set of rails is attached to the building structure, and a sound absorbing laminate is inserted between the set of rails. (C) The sound absorbing laminate is attached to the building structure with screws or bolts and nuts. Can be done by any one or combination of fixing. You may attach to a building structure in the state which connected the some sound absorption laminated body using the mechanical fastener etc. for the purpose of shortening of a construction period.

  As an adhesive, a double-sided tape, or a mechanical fastener, the same thing as what was mentioned above about the attachment means can be used. The adhesive can be applied to either one or both of the surface opposite to the sound absorbing material of the support of the sound absorbing laminate and the surface of the building structure. The double-sided tape can be applied to either the surface opposite to the sound absorbing material of the support of the sound absorbing laminate or the surface of the building structure. When using an adhesive or a double-sided tape, the support surface of the sound-absorbing laminate and / or the surface of the building structure may be primed as necessary. For mechanical fasteners, use adhesive, double-sided tape, stitching, welding, etc. to place one of the hooks and loops on the surface of the support, and the other of the hooks and loops is primed as necessary. Can be fixed using screws, bolts and nuts, adhesives, double-sided tape, and the like.

  Mounting a sound-absorbing laminate using rails to a building structure is done by attaching a set of metal or plastic rails to the building structure with screws, bolts and nuts, adhesive, double-sided tape, etc. This can be done by inserting a sound absorbing laminate between the rails. In this embodiment, it is desirable that the portion of the sound absorbing laminate that contacts the rail has sufficient strength and rigidity to support the weight of the sound absorbing laminate. As such a contact portion, for example, the frame structure or the sealing portion described above may be used, and an elongated plate suitable for insertion into the rail may be separately attached to the sound absorbing laminate. A slide rail in which an outer rail and an inner rail slide with each other by a slide ball can also be used as the rail.

  When the sound-absorbing laminate is fixed to the building structure using screws or bolts and nuts, eyelet holes for allowing the screws or bolts to pass through may be provided in the peripheral portion of the sound-absorbing laminate.

  The sound-absorbing laminate of the present disclosure can be used for sound-absorbing applications in various building structures, and can be suitably used particularly as a sound-absorbing unit for roads and railways or a part thereof. As the sound absorbing unit including the sound absorbing laminated body of the present disclosure, for example, a rectangular parallelepiped portion in which parts obtained by bending several steel plates of a predetermined width into a U-shape are fixed by a method such as rivets, bolts, and welding, and a sound intrusion side surface In addition, a case in which a sound-absorbing laminate is mounted in a case in which a perforated panel such as a round hole or a horizontally long slit is combined. Specific examples of the installation location of the sound-absorbing laminated body include the main girder of an elevated structure such as an elevated road, a highway, and a bridge, the back surface of a floor board, the tunnel lining surface, the ceiling and side walls of a box.

  In the following examples, specific embodiments of the present disclosure are illustrated, but the present invention is not limited thereto.

<Example 1>
As a polypropylene support, a 450 mm square, 0.75 mm thick polypropylene sheet, Synsalate (registered trademark) sound-absorbing heat insulating material SM-600L (unit area mass 642 g / m ² , thickness 42 mm, composed of polypropylene fibers and polyester short fibers) A laminate of a nonwoven fabric sound absorbing material and black polypropylene nonwoven fabric, 3M Japan Co., Ltd. (Shinagawa-ku, Tokyo, Japan) is placed so that the sound absorbing material is sandwiched between the polypropylene sheet and the black nonwoven fabric, and 15 mm inside from the periphery of the polypropylene sheet. The sound-absorbing laminate of Example 1 was produced by ultrasonic welding with a width of 5 mm along the line. The mass of the sound absorbing laminate was 268 g, and the thickness was 42 mm.

<Example 2>
As a polypropylene support, 450 mm square and 0.75 mm thick polypropylene sheet, Synsalate (registered trademark) sound-absorbing heat insulating material TAI-7027L (unit area mass 713 g / m ² , thickness 47 mm, composed of polypropylene fibers and polyester short fibers) A laminate of a nonwoven fabric sound absorbing material and a white polypropylene nonwoven fabric) is placed so that the sound absorbing material is sandwiched between the polypropylene sheet and the white nonwoven fabric, and is 5 mm wide along the line 15 mm inside from the periphery of the polypropylene sheet, under the same conditions as in Example 1. The sound-absorbing laminate of Example 2 was produced by ultrasonic welding. The mass of the sound absorbing laminate was 283 g, and the thickness was 47 mm.

<Example 3>
On the sound-absorbing laminate of Example 2, Sinsarate (registered trademark) sound-absorbing heat insulating material SM-600L was laminated so that the sound-absorbing material of SM-600L was in contact with the white nonwoven fabric of the sound-absorbing laminate of Example 2, and from the periphery of the polypropylene sheet Ultrasonic welding was performed under the same conditions as in Example 1 with a width of 5 mm along the inner line of 15 mm to produce the sound-absorbing laminate of Example 3. The mass of the sound absorbing laminate was 450 g and the thickness was 89 mm.

<Comparative Example 1>
As Comparative Example 1, glass wool having a unit area mass of 1600 g / m ² and a thickness of 50 mm was prepared.

  The normal incident sound absorption coefficient of the sound-absorbing laminates of Examples 1 to 3 and the glass wool of Comparative Example 1 is shown in a semi-logarithmic graph with the horizontal axis as a logarithmic scale in FIG. The normal incidence sound absorption coefficient was measured according to ASTM E 1050.

  With the double-sided foam tape (thickness 1 mm) attached to the exposed surface of the polypropylene support of the sound-absorbing laminate of Example 1, the sound-absorbing laminate was attached to a 0.8 mm-thick steel plate via the double-sided foam tape. FMVSS (Federal Motor Vehicle Safety Standard) No. In accordance with 302, combustion was started from the cut surface and a combustion test was performed. The fire was extinguished before reaching the combustion time measurement start line (A marked line). Therefore, the sound-absorbing laminate of Example 1 conformed to the FMVSS standard.

DESCRIPTION OF SYMBOLS 10 Sound absorption laminated body 12 Polyolefin nonwoven fabric 13 Nonwoven fabric layer 14 Sound absorption material 15,15 'Sound absorption material layer 16 Polypropylene support 17 Frame structure 18 Sealing part 19 Attachment means 22,22' Liner 24 Corrugated sheet core material

Claims (12)

  A sound-absorbing laminate comprising a polyolefin nonwoven fabric layer, a sound-absorbing material containing polypropylene fibers, and a polypropylene support in this order, wherein the sound-absorbing material is a peripheral portion of the polyolefin nonwoven fabric layer and the polyolefin nonwoven fabric layer and the polypropylene support. A sound-absorbing laminate that is sealed by   The sound-absorbing laminate according to claim 1, wherein the polypropylene support has a thickness of 300 μm to 10 mm.   The sound-absorbing laminate according to claim 1 or 2, wherein the polypropylene support is a solid sheet or a hollow structure having a liner and a corrugated core material joined to the liner.   The sound-absorbing laminate according to any one of claims 1 to 3, wherein the sound-absorbing laminate has a frame structure surrounding the sound-absorbing material.   The sound-absorbing laminate according to any one of claims 1 to 4, wherein the polyolefin nonwoven fabric layer contains a light stabilizer.   The sound-absorbing laminate according to any one of claims 1 to 5, wherein the sound-absorbing material further includes polyester short fibers.   The sound-absorbing laminate according to any one of claims 1 to 6, wherein the sound-absorbing material includes two or more sound-absorbing material layers.   The sound-absorbing laminate according to any one of claims 1 to 7, wherein attachment means is disposed on a surface of the polypropylene support opposite to the sound-absorbing material.   A road and railway sound absorbing unit including the sound absorbing laminated body according to any one of claims 1 to 8. Providing a polyolefin nonwoven fabric layer, a sound absorbing material comprising polypropylene fibers, and a polypropylene support;
Stacking the polyolefin nonwoven fabric layer, the sound absorbing material, and the polypropylene support in this order;
A method for producing a sound-absorbing laminate, comprising welding the polyolefin nonwoven fabric layer and the polypropylene support at a peripheral edge of the polyolefin nonwoven fabric, and sealing the sound absorbing material with the polyolefin nonwoven fabric layer and the polypropylene support. A method of attaching a sound absorbing laminate to a building structure,
A sound-absorbing laminate according to any one of claims 1 to 7 is prepared,
Including attaching the sound absorbing laminate to a building structure;
The sound absorbing laminate is attached to the building structure,
(A) The surface of the polypropylene support opposite to the sound absorbing material and the surface of the building structure are bonded via at least one of an adhesive, a double-sided tape, and a mechanical fastener.
(B) A set of rails is attached to the building structure, and the sound absorbing laminate is inserted between the set of rails.
(C) fixing the sound-absorbing laminate to the building structure using screws or bolts and nuts;
A method for attaching a sound-absorbing laminate to a building structure, which is performed by any one or a combination of the above.   A building structure to which the sound-absorbing laminate according to any one of claims 1 to 7 is attached.

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