JP2006342565A - Sound-proof interior finish material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound-proof interior finish material which is adequate for a wall substrate, and has excellent soundproofing performance and sufficient strength. <P>SOLUTION: The interior finish material is a laminated body consisting of a sound absorbing front member 1 which has sound absorbing holes 4 perforated from a front surface to a rear surface thereof at predetermined longitudinal and transverse intervals, a rear member 2 formed of the same material as that of the front member and arranged on a rear surface of the sound absorbing front member 1, and a sound insulation layer 3 laminated on a rear surface of the rear member 2. According to the structure of the interior finish material, each sound absorbing hole 4 is formed so as to have a small-diameter hole portion 4a on a front side of the front member and a large-diameter hole portion 4b on a rear side of the same, and therefore sound reaching the interior of the sound absorbing hole 4 is effectively absorbed. Further the large-diameter hole portions 4b of the sound absorbing holes 4 adjacent to each other are connected together via a groove-like space 5 formed along a front surface of the rear member 2, and therefore the sound is further damped and absorbed in the groove-like space 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an interior material in a room requiring soundproofing such as a piano room, a home theater room, and an audio room in a house, and more particularly to a soundproofing interior material suitable for use as a wall material or a wall base material.

  Conventionally, various structures have been developed as soundproofing interior materials having sound absorption properties and sound insulation properties. For example, as described in Patent Document 1, many sound absorption materials such as pin holes are formed on the surface. By attaching a breathable surface covering material to the surface of the sound absorbing plate made of a fiber plate having holes, and by integrally layering a sound insulating layer on the back surface of the sound absorbing plate, sound generated in the room is generated. There is known a soundproofing interior material configured to be absorbed and attenuated by the numerous fine sound absorbing holes and to prevent sound from being propagated to an adjacent room by a sound insulation layer.

Further, as described in Patent Document 2, a surface layer material such as a plywood having a large number of small-diameter through-holes, and a semi-through hole or a through-hole bonded to the back surface of the surface layer material and having a diameter larger than that of the through-holes And a sound insulation board provided on the back surface of the fiber board, and the small-diameter through hole of the surface layer material is in communication with the large-diameter half through-hole or through-hole of the fiber board. In addition, a soundproof interior material has been proposed in which a sound absorbing hole having a widening is formed by which these holes can effectively absorb and attenuate sound.
Japanese Utility Model Publication No. 63-9692 Japanese Utility Model Publication No. 63-28740

  However, according to the former soundproofing interior material, since the sound absorbing hole made up of a pin hole or the like is formed with a constant fine diameter from the opening end to the hole bottom, the performance of absorbing and attenuating sound is not so good. It was enough.

  On the other hand, according to the latter soundproofing interior material, the sound absorption hole is formed in a shape having a small diameter on the opening end side and a large diameter in the inside, so that the sound absorption effect is similar to that of the Helmholtz resonator. The sound that enters the hole expanded from the small-diameter opening end is diffused in the hole and the air layer in the hole is vibrated while being diffusely reflected by the hole wall, and the sound energy is converted into thermal energy by friction with the surroundings. Moreover, even when a decorative sheet is attached to the surface of the surface layer material by setting the small-diameter through hole of the surface layer material to a hole diameter of several millimeters, it is possible to absorb the sound. When the sound hits, the vibration of the air in the portion can be increased to improve the sound absorption performance.

  However, in order to provide sufficient sound absorbing performance as a sound absorbing interior material, it is necessary to provide a large number of the above-described sound absorbing holes having a broadened shape. However, if this is done, the internal space area becomes wider and the strength decreases. Therefore, there is a limit even if a large number of sound absorbing holes are provided.

  The present invention has been made in view of such problems, and an object thereof is to provide a soundproofing interior material having sufficient strength and capable of exhibiting excellent sound absorption performance.

  In order to achieve the above object, a soundproofing interior material according to the present invention includes a sound absorbing surface layer material in which sound absorbing holes are provided at regular intervals in the length direction and the width direction, and the sound absorbing surface layer. A soundproof interior material comprising a back material integrally laminated on the back surface of the material, wherein the sound absorbing hole penetrates between the front and back surfaces of the sound absorbing surface layer material, and the upper portion is a small diameter hole portion and the lower portion is a large size. It is formed in the diameter hole part, and it is set as the structure which connected between the large diameter hole parts of the adjacent sound absorption hole by the groove-shaped space part provided along the surface of the said back surface material.

  In the soundproof interior material configured as described above, the invention according to claim 2 is characterized in that a sound insulation layer is laminated and bonded to the back surface of the back material.

  According to the soundproof interior material of the present invention, since the sound absorbing holes provided in the sound absorbing surface layer material are formed in the small diameter hole portion on the front surface side and the large diameter hole portion on the back surface side, from the opening end of the small diameter hole portion. The sound that has entered can be effectively absorbed in the large-diameter hole and attenuated efficiently, so that not only the sound absorption can be improved, but also the back-side of the large-diameter hole of the adjacent sound absorption hole. Since the open ends communicate with each other through a groove-like space provided along the surface of the back surface material, the back surface communicates with the open end of the small-diameter hole through the large-diameter hole by the groove-like space. The air layer on the side can be enlarged, and the sound can be efficiently attenuated in the groove-shaped space portion together with the large-diameter hole portion. In particular, the sound absorption rate in a high frequency range can be improved.

  Further, as described above, without increasing the diameter of each sound absorbing hole, a groove that connects the adjacent sound absorbing holes along the surface of the back surface material to the back surface side of the sound absorbing surface layer material provided with this sound absorbing hole. Since the sound-absorbing air layer is expanded by providing the shape space portion, it is possible to provide a soundproof interior material having excellent sound absorption performance without substantially reducing the strength of the interior material.

  According to the invention of claim 2, since the sound insulation layer is laminated and bonded to the back surface of the back material, the sound attenuated by the sound absorbing holes and the groove-like space is further insulated by the sound insulation layer. Therefore, it is possible to reliably suppress propagation to the back surface side, and it is possible to form a soundproof interior material suitable as a wall base material.

  Next, an embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, the soundproofing interior material is provided in a state where a large number of sound absorbing holes 4, 4, 4,... The sound absorbing surface layer material 1, the back material 2 integrally laminated on the back surface of the sound absorbing surface material 1, and the sound insulating layer 3 laminated on the back surface of the back material 2, are adjacent to each other. The sound absorbing holes 4 and 4 have a structure in which the openings opened on the back surface side of the sound absorbing surface layer material 1 are communicated with each other by a groove-like space portion 5 provided along the surface of the back material 2.

  The sound-absorbing surface layer material 1 provided with the sound-absorbing holes 4 and the groove-like space portions 5 is a rectangular mineral fiber board or a volcanic glassy multilayer board having a certain thickness (trade name: DAILIGHT, Daiken Kogyo Co., Ltd.) The sound absorbing holes 4 are provided in a state of being penetrated between the front and back surfaces at regular intervals in the length direction and width direction (vertical width direction and horizontal width direction).

  In addition to the mineral fiber board and the volcanic glassy multilayer board, the constituent material of the sound-absorbing surface material 1 is a wood material such as plywood, soft fiber board, LVL, wood veneer, particle board, wafer board, etc. In addition, a plate-like product made of an inorganic fiber containing inorganic fibers such as glass wool board, a plaster board, or the like can be used. In this case, in view of sound absorption, it is desirable to use a softer fiberboard, mineral fiberboard, glass wool board, or the like having a more porous interior. In consideration of flame retardancy and fire resistance, it is desirable to use an inorganic fiber plate-like material containing inorganic fibers such as mineral fiber board, volcanic glassy multilayer board, and glass wool board.

  On the other hand, although it does not specifically limit as a constituent material of the said back surface material 2, The thing similar to the said sound-absorbing surface layer material 1 can be used. At this time, when the sound absorbing surface layer material 1 is made of a material having a relatively low sound absorbing property, it is desirable that the back surface material 2 is made of a material having a high sound absorbing property. With this configuration, the sound that has entered the sound absorbing hole 4 provided in the sound absorbing surface layer material 1 is satisfactorily absorbed and attenuated by the back surface material 2 that closes the lower end of the sound absorbing hole 4. Can be made. Of course, when the sound-absorbing surface layer material 1 is also made of a material having a high sound-absorbing property, the sound-absorbing performance can be further improved.

  Each of the sound absorbing holes 4 provided in the sound absorbing surface layer material 1 has a portion opened on the surface of the sound absorbing surface material 1 as a small diameter hole portion 4a and a portion opened at the back surface at the lower end of the opening. The large-diameter portion 4b is closed by the surface of 2. For example, in FIG. 1 and FIG. 2, the sound absorbing hole 4 is a portion provided on the surface side (upper half side) of the sound absorbing surface layer material 1 with the central portion in the thickness direction of the sound absorbing surface layer material 1 as a boundary. The diameter of the small-diameter hole 4a having a constant diameter over the entire length is gradually increased from the lower end of the small-diameter hole 4a toward the back surface of the sound-absorbing surface material 1 on the back surface side (lower half side). It is formed in the large-diameter hole 4b having a truncated conical shape.

  The sound absorbing hole 4 is not limited to the above-mentioned shape. For example, as shown in FIGS. 4 and 5, the surface side is formed in a hole having the same shape as the small-diameter hole 4a, while the back surface is formed. The side is formed into a hole shape having a large-diameter hole 4b1 expanded in a circular arc shape from the lower end of the small-diameter hole 4a or a large-diameter hole 4b2 expanded in a step shape from the lower end of the small-diameter hole 4a. It may be left. Further, without forming the small-diameter hole portion 4a having a constant diameter on the surface side of the sound-absorbing surface layer material 1, the entire sound-absorbing hole is gradually tapered from the surface of the sound-absorbing surface layer material 1 toward the back surface as shown in FIG. It may be formed in the frustoconical sound absorbing hole 4 whose diameter is enlarged to the front side, and the front surface side may be formed in the small diameter hole part 4a 'and the back surface side may be formed in the large diameter hole part 4b'. If it is formed, the surface-side opening edge of the small-diameter hole 4a 'becomes an acute angle, and defects are likely to occur. Further, since there is a difficulty in workability, the hole shape shown in FIG. 2, FIG. 4, and FIG. It is desirable to form it.

  Thus, if the surface side is formed in the small diameter hole portion 4a and the back surface side is formed in the large diameter hole portion 4b as the shape of the sound absorbing hole 4, the sound absorbing effect is exerted and the sound absorbing effect like a Helmholtz resonator is exhibited. However, if the diameter of the opening end of the small-diameter hole 4a that opens on the surface of the sound-absorbing surface material 1 is too small, the sound-absorbing effect is reduced, and if it is too large, the hole is formed when the surface is finished with a cloth or the like. May be easily damaged. If the hole diameter of the large-diameter hole portion 4b communicating with the small-diameter hole portion 4a in the sound-absorbing hole 4 is too large, the porosity inside the sound-absorbing surface layer material 1 increases and the strength of the sound-absorbing surface layer material 1 is not good. In addition, the adhesive strength between the sound-absorbing surface material 1 and the back material 2 cannot be obtained sufficiently.

Accordingly, although it varies depending on the thickness of the sound absorbing surface layer material 1, in order to secure the sound absorbing surface layer material 1 and the sound absorbing hole 4 in order to ensure good sound absorption, the sound absorbing surface layer material 1 has a thickness of about 7 mm. The diameter of the upper end of the small-diameter hole 4a of the hole 4 is set to about 4 mm to 8 mm, the diameter of the large-diameter hole 4b is set to about 5 mm to 15 mm, and the sound absorbing hole 4 is 500 per unit area (m ² ). It is desirable to form at a rate of about 3000. The sound absorbing holes 4 are not limited to holes having a circular cross section, but may be formed as elliptical or polygonal holes.

  The open ends of the large-diameter holes 4b in all the sound absorbing holes 4 provided in the sound absorbing surface layer material 1 are closed by the surface of the back surface material 2 laminated and adhered to the back surface of the sound absorbing surface layer material 1. In the adjacent sound absorbing holes 4, 4, the open end portions of the large-diameter hole portion 4 b communicate with each other by the groove-like space portion 5 provided along the surface of the back material 2 as described above. .

  As shown in FIG. 3, the groove-like space portion 5 has a large-diameter hole portion 4 b of the sound absorbing holes 4, 4 adjacent to the length direction (vertical width direction) and the width direction (lateral width direction) of the sound absorbing surface layer material 1. 4b, that is, so as to communicate radially from one sound absorption hole 4 to the four sound absorption holes 4 adjacent to the sound absorption hole 4, as shown in FIG. 7, adjacent sound absorption holes diagonally. 4, 4 and 4 may be communicated with each other by a slanted groove-like space 5 ′. However, if the number of the groove-like space portions 5 and 5 ′ communicating between the large-diameter hole portions 4b and 4b of the sound absorbing holes 4 and 4 increases, it depends on the size of the groove-like space portions 5 and 5 ′. There is a risk that the strength of the sound-absorbing surface layer material 1 may be reduced, and the adhesion area with the back surface material 2 is reduced, so that sufficient adhesion strength cannot be obtained, and the sound-absorbing holes 4 and 4 adjacent in the length direction are large. The number of groove-like space portions 5 and 5 ′ to be communicated is small, such as only between the diameter hole portions 4b and 4b or only between the large diameter hole portions 4b and 4b of the sound absorbing holes 4 and 4 adjacent in the width direction. In this case, since the sound absorbing function by the groove-like space portions 5 and 5 ′ is lowered, it is desirable to provide the groove-like space portions 5 and 5 ′ from one sound absorbing hole 4 in four to eight directions.

  As the size of the groove-like space portions 5 and 5 ', the groove width is within a range smaller than the diameter of the large-diameter hole portion 4b in the sound absorbing hole 4, and is formed to have a width of about ± 3 mm from the hole diameter of the small-diameter hole portion 4a. is doing. The depth from the back surface of the sound-absorbing surface layer material 1 is desirably about 0.5 mm to 3.5 mm. If the groove width is too narrow and the depth is less than 0.5 mm, the sound absorbing effect is reduced by these groove-like spaces 5, 5 ', whereas if the groove width is too wide, the adhesive strength with the back material 2 is weak as described above. Therefore, if the depth is deeper than 3.5 mm, the strength may be insufficient.

  The cross-sectional shapes of the groove-like space portions 5 and 5 ′ are not limited to a rectangular shape, and are not particularly limited, such as a semicircular shape and a polygonal shape. Further, the groove-like space portions 5 and 5 ′ are engraved from the back surface of the sound absorbing surface layer material 1 toward the center portion in the thickness direction of the sound absorbing surface layer material 1 on the sound absorbing surface layer material 1 side. The open end of the back surface material 2 is closed together with the open end of the large-diameter hole portion 4b of the sound absorbing hole 4 on the surface of the back surface material 2, but not provided on the sound absorbing surface layer material 1 but provided on the surface layer portion of the back surface material 2. Also good. However, if it is provided on the back surface material 2 side, the sound absorbing surface layer material 1 must be provided with the sound absorbing holes 4 and the back surface material 2 must be provided with the groove-like space portion 5, which requires a lot of processing work and the sound absorbing surface layer. When this back material 2 is laminated and bonded to the back surface of the material 1, it is not preferable because the positioning of the sound absorbing holes 4 and the groove-like space portions 5 and 5 'is difficult and productivity is lowered.

  The sound insulation layer 3 that is integrally layered on the back surface of the back material 2 includes metal plates, cement plates, metal powder-mixed resin layers, resin sheets mixed with high specific gravity materials such as barium sulfate, and the like. Made of high material. Moreover, when employ | adopting a porous material, a relatively high density plywood, MDF, LVL, a particle board, a wafer board, a volcanic glassy multilayer board, a gypsum board, etc. can also be used. A decorative sheet such as a cloth may be attached to the surface of the sound absorbing surface layer material 1. Next, specific examples of the present invention and comparative examples will be shown.

[Example 1]
The sound-absorbing surface layer material and the back surface material are formed from a mineral fiber board with a specific gravity of 0.48 and a thickness of 7 mm. The sound-absorbing surface layer material has a small-diameter hole with a depth of 3.5 mm and a diameter of 6 mm from the surface of the sound-absorbing surface layer material. A sound absorbing hole consisting of a large diameter hole portion having a truncated cone shape communicating with the small diameter hole and having a diameter of 15 mm on the back surface of the sound absorbing surface layer material. 1444 / m ^{2 at} a pitch of 25 mm. Further, as shown in FIG. 3 above, the back surface of the sound-absorbing surface layer material is a semicircular cross-section having a depth of 1 mm and a groove width of 5 mm where the large-diameter holes of the sound-absorbing holes adjacent in the length direction and the width direction are communicated. A groove-shaped space portion having a shape was processed. Then, the back surface material is overlapped on the back surface of the sound absorbing surface layer material and bonded together, and a sound insulation sheet having a thickness of 0.6 mm based on a vinyl chloride resin containing a high specific gravity substance is formed on the back surface of the back material. The interior material formed by laminating and bonding to form a sound insulation layer was obtained.

[Example 2]
In the interior material of Example 1 above, a semicircular groove having a depth of 1 mm and a groove width of 5 mm, in which the large-diameter holes of the sound-absorbing holes adjacent to the sound-absorbing surface layer material in the length direction and the width direction are communicated As shown in FIG. 7, a structure in which diagonally adjacent sound absorbing holes are communicated by a slanted groove-like space having a semicircular cross section having a depth of 1 mm and a groove width of 5 mm as shown in FIG. The interior material was obtained. The shape and size of the sound absorbing holes, the number per unit area, and other configurations are the same as in the first embodiment.

[Comparative Example 1]
In the interior material of Example 1, an interior material having a structure in which only sound absorbing holes were provided without providing a groove-like space portion was obtained. The shape and size of the sound absorbing holes in this interior material, the number per unit area, and other configurations are the same as in the first embodiment.

  FIG. 8 shows a comparison test result of the sound absorption performance of the above-described Example 1, Example 2, and Comparative Example 1. FIG. 8 shows the test results of the sound absorption coefficient. The sound absorption coefficient of Example 1 is indicated by a solid line A, Example 2 is indicated by a solid line B, and Comparative Example 1 is indicated by a solid line C. The sound absorption coefficient was measured by JIS A 1045 “Measurement of sound absorption coefficient and impedance by impedance tube and constant standing wave ratio method” (in-tube method test). As is clear from this figure, in Example 1 and Example 2 in which the large-diameter hole portions of the adjacent sound absorbing holes are communicated by the groove-like space portion, in Comparative Example 1 in which no groove-like space portion is provided. In comparison, particularly in a frequency range of 500 Hz or higher, the sound that has entered the sound absorption hole can be efficiently attenuated in the groove-like space.

FIG. 3 is a simplified perspective view partially cut out and sectioned. FIG. The back view of a part of sound-absorbing surface layer material showing the arrangement state of sound-absorbing holes. Sectional drawing which shows another shape of a sound absorption hole. Sectional drawing which shows another shape of a sound absorption hole. Sectional drawing which shows another shape of a sound absorption hole similarly. The back view of a part of sound-absorbing surface layer material showing another arrangement state of sound-absorbing holes. Comparison diagram of sound absorption rate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sound absorption surface material 2 Back material 3 Sound insulation layer 4 Sound absorption hole
4a Small hole
4b Large-diameter hole 5 Grooved space

Claims (2)

  A sound-proof interior material comprising a sound-absorbing surface layer material in which sound-absorbing holes are provided at regular intervals in the length direction and the width direction, and a back material integrally laminated on the back surface of the sound-absorbing surface layer material. It penetrates over the front and back surfaces of the surface layer material, and the surface side is formed in the small diameter hole portion, the back surface side is formed in the large diameter hole portion, and further, between the large diameter hole portions of the adjacent sound absorbing holes A soundproof interior material characterized in that it communicates with a groove-like space provided along the surface of the back material.   The soundproof interior material according to claim 1, wherein a sound insulation layer is laminated and bonded to the back surface of the back material.

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