JP3130583U - Interior panel material, interior structure and rib material - Google Patents

Abstract

[PROBLEMS] To suppress the radiated sound of a solid sound in a wide frequency band from a low sound range to a high sound range, to be inexpensive and excellent in workability, and to obtain a sufficient bonding strength between an interior board and a casing. Provide interior panel materials.
An interior panel material (10) comprising an interior board (12) covering an inner surface of a housing of a structure and rib members (14) provided in rows at predetermined intervals on a housing facing surface (17) of the interior board (12). 14, the sheet-like paper material 16 is laminated on both surfaces of the foamed plastic 15 made of a polyethylene-based resin foam particle molded body having an apparent density of 0.022 to 0.060 g / cm ³ , and the width is 30 to 150 mm. An interior panel material 10, which is a plate-like long object having a total thickness of 10 to 50 mm and a dynamic elastic modulus of 2 to 20 MPa.
[Selection] Figure 1

Description

  The present invention relates to a highly sound-insulating interior panel material and an interior structure including the interior panel material, and in particular, in the field of architectural acoustics, a low-noise interior panel material capable of suppressing sound radiated from an enclosure to the internal space, The present invention relates to a rib member attached to a panel member and an interior structure.

  In recent years, noise due to solid sound radiation has become a major problem in structures such as apartment buildings, hotels, office buildings, and theaters due to overcrowding of cities, increasing size of equipment, and increasing output. Solid sound is noise that is radiated from the surface of a frame such as a floor, wall, or ceiling to the internal space of the structure as vibration propagates through the solid such as the ground or the frame of the structure. As vibration sources that generate solid sounds, there are external noises such as railways and vehicles, and internal noises such as footsteps on the floor and living sounds in adjacent rooms. Solid sound can be broadly classified according to the propagation path. There are sound transmitted directly through the sound-insulating wall through structures such as walls, and side-propagation sound radiated into the internal space after passing through the floor and side walls. Covers both.

  For large structures such as condominiums and office buildings, concrete or lightweight aerated concrete (ALC) enclosures and interior such as plasterboard are used from the viewpoints of ease of construction, shortening the construction period, construction costs, and effective use of space. It is common to join a board by any of the following means.

(1) A GL method (direct pasting method) in which a gypsum adhesive (so-called GL bond) is scattered and applied on the inner surface of the housing in a dotted manner to firmly connect the interior boards.
(2) A wooden shaft construction method (concrete-based foundation trunk construction method) in which interior boards are attached using wooden bricks and wood foundations directly supported by a concrete frame.
(3) In the above, the LGS construction method which constructs an interior finishing board using a lightweight steel foundation (LGS) instead of a wooden foundation.

  However, the interior structure constructed by the above methods has a problem in that solid sound cannot be sufficiently reduced because the housing and the interior board are firmly joined. For example, in the wooden shaft method and the LGS method, the interior board installed on the indoor side of the housing amplifies the radiated sound in the low frequency range (63 to 125 Hz band: hereinafter sometimes referred to as the low frequency range), and the acoustic performance in the room It has been pointed out that the problem is reduced. Not only does the GL method not provide the sound insulation performance of the interior board, but there is a significant sound insulation loss in the 250 to 500 Hz band (hereinafter sometimes referred to as the mid range) and the 1 to 2 kHz band (hereinafter also referred to as the high range). Has been pointed out.

On the other hand, the invention of the interior structure that can improve the sound insulation performance while maintaining the ease of construction has been proposed.
For example, in the following Patent Document 1, the GL construction method is improved, and the internal board direct attachment structure (NC) that can shift the resonance point of the housing and the interior board by applying a GL bond in a Z-shape to avoid sound insulation defects (NC) Invention) is described.
Further, in Patent Document 2 below, as an acoustic measure for solid sound in the GL method, a cardboard is installed between the interior board and the construction surface of the housing, and the cardboard is pressed against the adhesive applied to the construction surface. The invention of the attachment method is described.
Furthermore, the following Patent Document 3 describes an invention of an interior board mounting method in which a lattice body made of paper, resin, or the like is attached to the back side of a gypsum board, and this is pressed against an adhesive applied to a construction surface of a housing. Yes.

  Further, in Patent Document 4 below, the casing of the structure and the interior plate are joined to each other with a rib made of foamed plastic, and the elastic modulus of the rib is adjusted, so that the radiated sound below the coincidence frequency of the casing is generated. An invention of an interior structure that can suppress both amplification and amplification of radiated sound in the middle / high range above the frequency is described. The coincidence frequency is a phenomenon that the sound wave easily passes through the member when the wavelength of the bending wave generated by the sound wave incident on the member matches or approaches the wavelength of the incident sound wave (coincidence effect). Means the frequency of sound waves.

JP 2001-27028 A JP 2002-194432 A JP 2001-295448 A JP 2004-293065 A

The invention described in Patent Document 1 relates to a structure in which an interior board is supported on a casing by an elastic adhesive, but such a structure is effective to some extent for improving a sound insulation defect in a high sound range, but a resonance mode changes. Amplification of the radiated sound in the middle range may occur, and the acoustic performance in the middle range may deteriorate.
The inventions described in Patent Documents 2 and 3 are based on the technology of improving the bending rigidity of the interior board by imparting the bending rigidity of the cardboard and the lattice body, and suppressing the resonance and resonance. In this way, when the bending rigidity of the interior board itself is improved, the sound performance in the middle range may be deteriorated as compared with the conventional interior board.
Further, according to the invention described in Patent Document 4, although the sound insulation defect can be improved satisfactorily, the interior structure according to the invention is foamed between an interior plate such as a gypsum board and an adhesive such as a gypsum system. Since both of them are joined by interposing a rib made of plastic or the like, there is room for improvement in obtaining sufficient strength of the installed interior structure. This is due to the fact that the surface of the foamed plastic may be inferior in bondability with a gypsum board or a gypsum adhesive.

  The present invention has been made to solve the above-described problems of the prior art, and can suppress the radiated sound of a solid sound in a wide frequency band from a low frequency range to a high frequency range, and is inexpensive and easy to work. An object of the present invention is to provide an interior panel material that is excellent and can obtain a sufficient bonding strength between the interior board and the casing, a rib material attached to the panel material, and an interior structure including the interior panel.

The solid sound radiated from the housing of the structure is a spring composed of the housing (mass) of the structure, the elasticity of the air layer (spring) existing between the inner surface of the housing and the interior board, and the interior board (mass). -Amplified by mass-air-mass resonance (MA resonance). Such amplification conditions are governed by the center frequency of the excitation source, the MA resonance frequency, and the coincidence frequency depending on the thickness of the housing.
The center frequency of the excitation source depends on the type of the excitation source, but is generally about 63 Hz to 2 kHz from the low range to the high range as described above.
Here, if the MA resonance frequency can be deviated from the center frequency of the excitation source, the response magnification of the MA resonance system can be lowered. However, for example, to reduce the MA resonance frequency to 63 Hz or less, it is necessary to increase the weight by increasing the thickness of the interior board, or to increase the thickness of the air layer. Not right. On the other hand, for example, in order to obtain an MA resonance frequency exceeding 250 Hz corresponding to the middle sound range, it is not feasible, for example, it is necessary to extremely reduce the weight of the interior board, and there is a possibility that the acoustic performance in the high sound range may be deteriorated. Will result.

For this reason, after defining the reduction amount of solid sound radiated from the interior board (radiation reduction amount: RR) as the ratio of the acoustic radiation power by the MA resonance system to the acoustic radiation power of the interior board alone, Consider ways to improve.
First, when the interior board and the casing are directly joined without any damping material (hereinafter referred to as a ribless double plate structure), the peak characteristics of the coincidence frequency of the casing and the peak characteristics of the MA resonance frequency The spatial profile of the acoustic radiation power radiated into the room is determined by the overlap, and it has been found that the acoustic radiation power becomes very large particularly at the point where the peak characteristics of the coincidence frequency and the MA resonance frequency of the enclosure overlap (refer to the above patent document). 4). That is, the occurrence of the primary natural vibration of the MA resonance enhanced by the coincidence frequency of the housing is a factor that reduces the radiation reduction amount RR.

  On the other hand, when the MA resonance system is configured by connecting the interior board and the housing with elastic ribs (hereinafter referred to as a double plate structure with ribs), it is radiated from the interior board in the middle and high sound ranges. The acoustic radiation power can be made close to that of a single case. This is because, in the middle and high sound ranges, acoustic vibrations are transmitted mainly through elastic ribs that mechanically join the interior board and the housing, rather than acoustic transmission through the air layer. On the other hand, as for the sound radiation power characteristics in the low frequency range, solid sound amplification due to MA resonance does not occur in the band below the coincidence frequency of the enclosure (generally about 125 Hz), but in the band above this frequency, the ribless double plate Amplification similar to the structure occurs.

  Therefore, a composite elastic modulus (hereinafter referred to as an elastic modulus of the rib) obtained by synthesizing the elastic modulus of the air layer, the elastic modulus of the elastic rib, and the elastic modulus of the interior board that governs the MA resonance frequency of the ribbed double plate structure. ), The acoustic radiation power and radiation reduction amount RR of the ribbed double plate structure were calculated, and the possibility of radiation noise reduction by vibration isolation of the ribs was examined.・ In the high sound range, reducing the elastic modulus of the ribs is effective in reducing the radiated sound, but in the band below the coincidence frequency, if the elastic modulus of the ribs is too small, the radiated sound may increase. I understood.

Based on the above knowledge, the interior panel material according to the present invention is
(1) An interior panel material composed of an interior board that covers the inner surface of the housing of the structure, and rib members that are provided in rows at predetermined intervals on the housing facing surface of the interior board,
The rib material is a plate-like long object having a sheet-like paper material laminated on both sides of a foamed plastic, a width of 30 to 150 mm, a total thickness of 10 to 50 mm, and a dynamic elastic modulus of 2 to 20 MPa. Interior panel material, characterized by
(2) In the above (1), the base resin of the foamed plastic is one or two or more compositions selected from polyethylene resins, polypropylene resins, and polystyrene resins. The interior panel material described,
(3) The interior panel material according to (1), wherein the foamed plastic is a polyethylene resin foamed particle molded body having an apparent density of 0.022 to 0.060 g / cm ³ .
Is the gist.

The interior structure according to the present invention is
(4) The interior panel material according to any one of (1) to (3) is fixed to the adhesive applied in a scattered manner on the inner surface of the casing of the structure via the rib material. Interior structure,
Is the gist.
The rib material according to the present invention is
(5) A sheet-like paper material is laminated on both surfaces of the foamed plastic, and is a plate-like long product having a width of 30 to 150 mm, a total thickness of 10 to 50 mm, and a dynamic elastic modulus of 2 to 20 MPa. Rib material attached to interior panel material characterized by
Is the gist.

According to the interior panel material and the interior structure provided with the interior panel material according to the present invention, by setting the shape and dynamic elastic modulus of the interior board and the rib within the predetermined range, the coincidence of the structural body that is generally about 125 Hz is achieved. In the low frequency range below the frequency, the emission of solid sound does not increase as compared with the double plate structure without ribs, and the emitted sound can also be reduced for the medium / high sound range solid sound.
In addition, according to the present invention, by forming a rib by laminating sheet-like paper materials on both sides of foamed plastic, the acoustic performance in the middle / high range is not deteriorated and the adhesiveness is not sufficient. A foamed plastic which is a porous flexible material and a gypsum-based adhesive applied to the inner surface of the housing can be firmly bound.
As a result, while maintaining the same cost performance and workability as the conventional GL method of being able to attach the interior panel material simply by pressing the interior panel material against the adhesive applied in the form of dots, from the low range to the high range. An interior structure that reduces the amplification of radiated sound can be obtained.

  Hereinafter, the best mode for carrying out the present invention will be specifically described with reference to the drawings. FIG. 1 is a three-side view of an interior panel material 10 according to an embodiment of the present invention, in which (a) is a plan view, (b) is a front view, and (c) is a right side view. The interior panel member 10 includes an interior board 12 that covers the inner surface of the casing of the structure, and a rib member 14 that is provided on one surface of the interior member 12 in rows at predetermined intervals. In addition, when attaching the interior panel material 10 to a housing, the surface in which the rib material 14 was provided is made to oppose the housing as the housing opposing surface 17.

A typical example of the interior board 12 is a plaster board (plaster board), but other materials such as plastic, wood, metal, and glass can also be used. The surface of the interior board 12 may be coated with another coating material, for example, a base paper for gypsum board with respect to the gypsum board, as long as the bonding property with the rib member 14 is not hindered.
The shape of the interior board 12 is generally a rectangle having a width of about 900 to 1500 mm and a length of about 1800 to 2500 mm as shown in FIG. 1 (b), but is not limited to this. It can also be. Moreover, as thickness of the interior board 12, when using a gypsum board, for example, it is common to set it as about 9-15 mm.

  The rib material 14 provided on one surface of the interior board 12 is obtained by laminating sheet-like paper materials on both surfaces of foamed plastic. About the shape, it is set as a plate-shaped elongate whose width | variety is 30-150 mm, the total thickness of foamed plastic and paper material is 10-50 mm, and the dynamic elastic modulus in this lamination | stacking state shall be 2-20 MPa. As a result, it is possible to suitably suppress the amplification of the radiated sound in a band lower than the coincidence frequency of the casing, and it is possible to significantly improve the sound insulation performance in the middle / high sound range as compared with the conventional board direct pasting method. Moreover, by setting it as the said width | variety and thickness dimension, the adhesion area with a housing is fully ensured, and a mechanical characteristic and workability are not significantly reduced with respect to the interior structure constructed by the conventional board direct pasting method.

When the rib members 14 having the above dimensions are provided in a row, the optimum distance L _OPT can be obtained from the following equation (1). However, the space | interval L means the distance between centers of the rib materials 14 at the time of arranging the long rib materials 14 in parallel as shown in FIG.1 (b). _{Further, K, rib} dynamic elastic modulus of the rib member 14, [rho _p1 is the density of the interior board 12, _{h 1} is the thickness of the interior board _{12, K PL} elastic modulus of the interior board 12, _{f c} the coincidence frequency of the skeleton It is. f _r (0) is the MA primary resonance frequency measured when a sound receiving point is provided in front of the excitation point in the peak locus of the MA primary resonance frequency of the ribbed double plate structure. Calculated in (2). ρ _p2 is the density of the housing, h ₂ is the thickness of the housing, ρ ₀ is the density of air, c ₀ is the speed of sound, and z ₁ is the thickness of the air layer between the housing and the interior board 12.

In the present invention, by appropriately selecting the dynamic elastic modulus K _rib of the rib member 14 from the range of 2 to 20 MPa, this is compared with a general interior board 12 represented by a gypsum board having a width of about 900 mm, As shown in FIG. 1, when the three are arranged side by side in the longitudinal direction, or in the same manner, the interval L when the five are arranged in _parallel is close to the optimum interval L _OPT of the rib member 14 obtained by the above equation (1). Therefore, the sound insulation performance can be improved for a wide range of solid sounds ranging from a low sound range to a high sound range. That is, as described later, by adjusting the dynamic elastic modulus of the foamed plastic so that the dynamic elastic modulus of the rib member 14 can be selected from the range of 2 to 20 MPa, this is the second order for the general interior board 12. The width dimension divided into four or four equal parts is close to the L _OPT obtained by the above equation (1).
In addition, the rib material 14 is provided in the center of the width direction of the interior board 12 by making the number of the rib materials 14 provided in parallel with the interior board 12 into an odd number. As a result, it is possible to suppress the primary natural vibration of the interior board 12 that is generally lower in frequency than the coincidence frequency of the casing, and to quickly attenuate this.

  FIG. 2 is a partially cutaway perspective view of the rib member 14 in which sheet-like paper material 16 is laminated on both surfaces of the foamed plastic 15. It should be noted that the rib member 14 shown in FIG. The paper material 16 is preferably coated on the entire front and back surfaces of the foamed plastic 15, but on the front side (the housing joint side), the adhesive such as a plaster system applied to the inner surface of the housing and the rib material 14 are substantially formed. In particular, as long as it is joined via the paper material 16, there may be a portion where a part of the surface of the foamed plastic 15 is exposed. The same applies to the back surface of the rib material 14 (inner board joining side). As long as the inner board 12 and the rib material 14 are substantially joined via the paper material 16, the back surface of the foam plastic 15 is not necessarily provided. It is not necessary that the entire surface is covered with the paper material 16.

Moreover, FIG. 3 is a two-view figure of the interior structure 20 concerning this Embodiment, (a) is a top view, (b) is a front view. The interior structure 20 is formed by joining a structural body 22 made of concrete or the like and the interior panel material 10 with a gypsum adhesive 24. As shown in FIG. 2B, the gypsum adhesive 24 is rounded in a dumpling shape and is dotted on the inner surface of the casing 22, that is, the inner surface of the casing 22 facing the interior panel member 10. From the state in which the gypsum-based adhesive 24 is applied to the housing 22 in the form of dots, the interior panel material 10 and the housing 22 are bonded and fixed by pressing the rib material 14 on each gypsum-based adhesive 24. Can do.
Therefore, the position where the gypsum adhesive 24 is provided may be distributed in a plurality of rows corresponding to the positions of the long rib members 14 provided side by side on the interior board 12.

  In this way, by applying the gypsum adhesive 24 to the housing 22 in the form of dots and joining the interior panel material 10, good workability equivalent to the conventional GL method and sufficient joint strength are ensured. However, it is possible to enjoy the effect of improving the sound insulation performance over a wide band according to the present invention.

As the base resin of the foamed plastic 15, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, or a polystyrene resin can be used. The said resin can select 1 type (s) or 2 or more types to make the composition of base resin. As a more preferable example of the foamed plastic 15, a polyethylene-based resin foam particle molded body having an apparent density of 0.022 to 0.060 g / cm ³ can be given. As the foamed particle molded body, either a crosslinked type or a non-crosslinked type can be used, but a crosslinked type is particularly preferred.
Here, by setting the apparent density of the foamed plastic 15 in the above range, a suitable dynamic elastic modulus of 2 to 20 MPa can be realized in a state where the paper material 16 is laminated on both surfaces. The apparent density referred to in the present invention means the apparent overall density defined in JIS K7222 (1999).
For example, to adjust the apparent density of a polyethylene resin foamed particle molded product within the above numerical range, for example, select the type of foaming agent as appropriate, or increase or decrease the amount of foaming agent impregnated into the resin particles. It is good to control the magnification. In addition, foamed plastic materials having the apparent density range are commercially available.

As the material of the paper material 16, the adhesiveness between the interior board 12 and the foamed plastic 15 is high, and the casing 22 and the interior panel material 10 can be joined with a predetermined strength by an adhesive such as a gypsum adhesive 24. If there is no particular limitation. Of these, gypsum board base paper is preferably used from the viewpoint of adhesiveness and strength of the paper 16 itself. In this case, the weight (basis weight) per unit area is 150 to 350 g / m ² , particularly 180 to 250 g / m, from the viewpoint of the strength of the rib member 14 and the acoustic performance of the interior panel to which the rib member is attached. ² is preferable.

  The base paper for gypsum board may have, for example, a three-layer structure in which a surface layer, an intermediate layer, and a back layer are combined, and each layer may be further composed of two or more layers, for a total of 4 to 9 layers. Examples of a preferable material for the paper material 16 include a hard paperboard formed into a plate shape by pressing and laminating a plurality of paper layers through a water-resistant adhesive. Moreover, the paper material 16 laminated | stacked on both surfaces of the foamed plastic 15 may use the same material for each front and back, or may mutually differ. For example, the paper material laminated on the front surface side of the foamed plastic 15 considers the adhesiveness with the gypsum adhesive 24, and the paper material laminated on the back surface side considers the adhesiveness with the interior board 12 and the material and papermaking. A configuration may be selected.

  For joining the foamed plastic 15 and the paper material 16, a material having a good affinity with the foamed plastic 15 can be selected and used. When the base resin of the foamed plastic 15 is a polyolefin resin, for example, an aqueous emulsion adhesive in which a synthetic resin polymer such as vinyl acetate resin, ethylene-vinyl acetate copolymer or acrylic resin is dispersed in water, or A resin-based solvent-type adhesive dissolved in an organic solvent may be used. Among these, a vinyl acetate resin emulsion adhesive is particularly preferable.

  The rib member 14 and the interior board 12 can also be joined via an adhesive, and an aqueous emulsion adhesive, a resin solvent adhesive, a hot melt adhesive, or the like can be used. Among these, a vinyl acetate resin emulsion adhesive is particularly preferable.

  In FIG. 3, the sound insulation performance of the interior structure 20 according to the present invention can be further enhanced by filling the space between the interior board 12 and the housing 22 with a sound absorbing material (not shown). Specifically, a sound-absorbing material having a total thickness of the rib material 14 and the gypsum adhesive 24 or a thickness slightly larger than that between the rows of the rib materials 14 in the housing facing surface 17 of the interior board 12. Wear it. As a result, when the rib member 14 is pressed against the gypsum adhesive 24 and the interior panel member 10 is attached to the housing 22, the sound absorbing material is also pressed against the housing 22 and mechanically comes into contact with the interior board 12. Can be suppressed by the viscoelastic deformation of the entire sound absorbing material. However, even if the thickness of the sound absorbing material is set to be equal to or less than the total thickness of the rib material 14 and the gypsum adhesive 24 and the interior panel material 10 and the housing 22 are combined, the sound absorbing material is provided in a state of floating from the housing 22. In this case, the effect of absorbing solid sound propagated from the housing 22 by local viscoelastic deformation of the sound absorbing material can be expected.

As the sound absorbing material, a porous sound absorbing material such as glass wool, rock wool or urethane foam, or foamed plastic can be used. When the loss coefficient of the sound absorbing material is 0.4 or more, the sound absorbing effect is sufficiently exhibited. Further, the dynamic elastic modulus of the sound absorbing material is equivalent to the Young's modulus of air (= 1.4 × 10 ⁵ [N / m ² ]) or a range of about 5 to 6 times that, that is, 2 × 10 ^{5 to} 9 × 10 ^5. By setting [N / m ² ], the MA resonance frequency of the interior structure 20 is not shifted to the high frequency side, and there is no possibility that the acoustic characteristics of the middle / high frequency range will be lowered. You can fully enjoy it.
The sound-absorbing material may be distributed at the center (face center) of the gypsum-based adhesive 24 arranged in the form of lattice points, or the sound-absorbing material is formed in a long shape and arranged in a line. You may provide between the rib materials 14 provided.

  The dynamic elastic modulus of the rib member 14 in which the sheet-like paper material 16 is laminated on both surfaces of the foamed plastic 15 can be obtained by a measuring device shown in the principle diagram of FIG. That is, the sample 40 of the rib member 14 is first placed on the excitation side plate 41, and the vibration receiving side plate 42 is further placed on the upper surface of the sample 40, and the sample 40 is placed on the vibration side plate 41 and the vibration receiving side plate 42. Leave it sandwiched between. Next, a vibration having a frequency of 5 to 100 Hz is applied to the vibration-side plate 41 in a state where a predetermined load is applied to the vibration-receiving side plate 42, and vibrations of the vibration-side plate 41 and vibrations of the vibration-receiving side plate 42 are respectively detected. Detect with the acceleration sensor. The detected acceleration data is amplified by the charge amplifiers 43 and 44, and the amplified data can be converted into a dynamic elastic modulus by the following equation (3) by the analyzer 45 of the fast Fourier transform (FFT) method. The converted dynamic elastic modulus calculation result is output by output means such as the printer 46.

(Equation 2)
Dynamic elastic modulus (N / m ² ) = f ₀ ² · W · t / 25A (3)

Where f ₀ is the natural frequency (Hz) of the sample 40 obtained by the analyzer 45, W is the mass (kg) of the sample 40, t is the thickness (m) of the sample 40, and A is the sample. This represents the area (m ² ) of the surface to which 40 vibration strain is applied.
In the present embodiment, the thickness of the sample 40 is the same as that of the rib member 14, and the vertical and horizontal dimensions are 300 mm square. The load applied to the vibration receiving side plate 42 was 0.09 kgf / cm ² . In addition, as a measuring apparatus with such a dynamic elastic modulus, a commercially available multi-axis switching type electrodynamic vibration testing apparatus can be used.

An acoustic test was performed on the interior structure 20 according to the present invention shown in FIG.
A gypsum board having a thickness of 12.5 mm as the interior board 12; a foamed polyethylene resin foamed particle having a dynamic elastic modulus of 2.7 MPa formed into a long shape having a thickness of 25 mm and a width of 50 mm as the foamed plastic 15 (Co., Ltd.) Made by JSP, Mirablock cross-linking type 26S, apparent density 0.035 g / cm ³ ); As the paper material 16, paper is pressed and laminated in a plurality of layers through a water-resistant adhesive having a basis weight of 200 g / m ² to form a plate shape The formed hard paperboard was used.
Three rib members 14 are formed by laminating and bonding the paper material 16 on both sides of the foamed plastic 15 with a vinyl acetate resin emulsion adhesive. These rib materials 14 are arranged in parallel at intervals of 45 mm, and bonded to the interior board 12 with the adhesive. The interior panel material 10 was obtained.
On the other hand, a concrete plate having a coincidence frequency of about 125 Hz is prepared as the housing 22, and the rib material 14 is bonded to each of the five locations by GL bonding to integrate the interior panel material 10 and the housing 22. Obtained.

With respect to the interior structure 20, the housing 22 was installed at the opening of the reverberation chamber, and the sound radiation power level PWL was measured in the sound receiving chamber on the interior panel material 10 side.
For comparison, a test body in which the interior board 12 was directly bonded to the housing 22 at the opening of the reverberation chamber by a GL bond was formed according to a conventional GL method, and the acoustic radiation power PWL was measured in the sound receiving chamber in the same manner as described above. .
When the measurement results of the two were compared, the radiated sound was remarkably reduced in the interior structure 20 according to the present invention particularly in the middle and high sound ranges exceeding 200 Hz, and the effect of the present invention was confirmed.

It is a three-view figure of the interior panel material concerning embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a right view. It is a partial notch perspective view of the rib material which laminated | stacked the sheet-like paper material on both surfaces of the foamed plastic. It is a two-view figure of the interior structure concerning embodiment of this invention, (a) is a top view, (b) is a front view. It is a principle figure of the measuring apparatus which measures the dynamic elastic modulus of a rib material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Interior panel material 12 Interior board 14 Rib material 15 Foamed plastic 16 Paper material 17 Housing | casing opposing surface 20 Interior structure 22 Housing 24 Gypsum adhesive 41 Excitation side plate 42 Vibration receiving side plate 43, 44 Charge amplifier 45 Analyzer 46 Printer

Claims (5)

An interior panel material composed of an interior board that covers the inner surface of the housing of the structure, and rib members that are provided in rows at predetermined intervals on the housing facing surface of the interior board,
The rib material is a plate-like long object having a sheet-like paper material laminated on both sides of a foamed plastic, a width of 30 to 150 mm, a total thickness of 10 to 50 mm, and a dynamic elastic modulus of 2 to 20 MPa. Interior panel material characterized by being. 2. The interior panel according to claim 1, wherein the base resin of the foamed plastic is one or two or more compositions selected from polyethylene resins, polypropylene resins, and polystyrene resins. Wood. 2. The interior panel material according to claim 1, wherein the foamed plastic is a polyethylene-based resin foam particle molded body having an apparent density of 0.022 to 0.060 g / cm ³ . An interior structure in which the interior panel material according to any one of claims 1 to 3 is fixed to the adhesive applied in a scattered manner on the inner surface of the casing of the structure via the rib material. A sheet-like paper material is laminated on both sides of the foamed plastic, and is a plate-like long product having a width of 30 to 150 mm, a total thickness of 10 to 50 mm, and a dynamic elastic modulus of 2 to 20 MPa. Rib material attached to interior panel material.

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