JPH0631701A - Acoustic board and manufacture thereof - Google Patents
Acoustic board and manufacture thereofInfo
- Publication number
- JPH0631701A JPH0631701A JP4194307A JP19430792A JPH0631701A JP H0631701 A JPH0631701 A JP H0631701A JP 4194307 A JP4194307 A JP 4194307A JP 19430792 A JP19430792 A JP 19430792A JP H0631701 A JPH0631701 A JP H0631701A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- sound absorbing
- acoustic
- solidifying
- adhesive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Dry Formation Of Fiberboard And The Like (AREA)
- Laminated Bodies (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Finished Plywoods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は木質繊維を主原料とする
吸音板に関し、木質繊維からなる吸音層上に、粉粒体か
らなる多孔質表面化粧層を積層した構成にすることによ
り、吸音層の高吸音性を維持しつつ、吸音板の強度を向
上させたものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing plate mainly made of wood fibers, which has a structure in which a porous surface decorative layer made of powder particles is laminated on a sound absorbing layer made of wood fibers to absorb sound. The strength of the sound absorbing plate is improved while maintaining the high sound absorbing property of the layer.
【０００２】[0002]
【従来の技術】従来より、木質繊維を主原料とする板と
しては、ＪＩＳ Ａ−５９０５で規格された軟質繊維板
（インシュレーションボード）、およびＪＩＳ Ａ−６
３０４で規格された吸音用軟質繊維板などが、製造およ
び販売されている。このうちＪＩＳ Ａ−５９０５は、
植物繊維を主原料とし、主に建物の保温を目的として成
形した密度０．４g/cm3未満の板に関する規格である。
またＪＩＳ Ａ−６３０４は、原則としてＪＩＳ Ａ−
５９０５に定められたＡ級インシュレーションファイバ
ーボードの表面に、穴あき加工して吸音性を付与した板
に関する規格である。2. Description of the Related Art Conventionally, as a board mainly made of wood fiber, a soft fiber board (insulation board) specified by JIS A-5905 and JIS A-6
A sound absorbing soft fiber board specified in 304 is manufactured and sold. Of these, JIS A-5905
It is a standard for boards with a density of less than 0.4 g / cm 3, which is formed mainly from plant fibers for the purpose of keeping the building warm.
JIS A-6304 is basically JIS A-
This is a standard relating to a plate in which the surface of a class A insulation fiber board specified in 5905 is perforated to provide sound absorption.
【０００３】[0003]
【発明が解決しようとする課題】上記のＪＩＳ Ａ−５
９０５に準拠した２例の軟質繊維板の吸音特性を、図４
に示す。図４において、破線で示したは、密度０．３
０g/cm3、厚み１２mm、曲げ強度３０kg/cm2の軟質繊維
板の吸音特性であり、実線で示したは、密度０．３０
g/cm3、厚み２４mmの軟質繊維板の吸音特性である。図
４から明らかなように、ＪＩＳ Ａ−５９０５に準拠し
た軟質繊維板は、一般に吸音性が低い。その理由は、Ｊ
ＩＳ Ａ−５９０５規格のうち、例えばＡ級インシュレ
ーションボードの場合、その曲げ強さについての規格は
２０kg/cm2以上となっているので、木質繊維間の強固な
密着を要し、その結果繊維間空隙が少なくなるためであ
ると考えられる。[Problems to be Solved by the Invention] The above JIS A-5
FIG. 4 shows the sound absorption characteristics of two soft fiberboards conforming to 905.
Shown in. In FIG. 4, a density of 0.3 is shown by a broken line.
The sound absorption characteristics of a soft fiber board of 0 g / cm 3 , thickness of 12 mm, and bending strength of 30 kg / cm 2 , indicated by the solid line are density 0.30.
Sound absorption characteristics of a soft fiber board having a thickness of 24 mm and a g / cm 3 . As is clear from FIG. 4, the soft fiber board according to JIS A-5905 generally has low sound absorption. The reason is J
Among ISA-5905 standards, for example, in the case of class A insulation boards, the standard for bending strength is 20 kg / cm 2 or more, so strong adhesion between wood fibers is required, and as a result, fibers It is considered that this is because the interstitial spaces are reduced.
【０００４】これに対して、ＪＩＳ Ａ−６３０４に準
拠した吸音用軟質繊維板の例の吸音特性を、図５に示
す。図５において、破線で示したは、比較のために記
載したもので、密度０．３g/cm3、厚み１２mmで、穴あ
き加工のない軟質繊維板の吸音特性であり、実線で示し
たは、密度０．３０g/cm3、厚み１２mmで、穴あき加
工された吸音用軟質繊維板の吸音特性である。図５から
明らかなように、ＪＩＳ Ａ−５９０５に準拠した吸音
用軟質繊維板は穴あき加工により、一般に吸音性が向上
している。しかしながら、表面に穴が露出しているの
で、外観上好ましくないという問題がある。本発明は前
記事情に鑑みてなされたもので、表面に穴が露出せず、
曲げ強さが高く、しかも吸音性も良好な吸音板を提供す
るものである。On the other hand, FIG. 5 shows the sound absorption characteristics of an example of a soft fiber board for sound absorption based on JIS A-6304. In FIG. 5, the broken line indicates the sound absorption characteristics of a soft fiberboard having a density of 0.3 g / cm 3 , a thickness of 12 mm and no perforation, which is shown for comparison, and the solid line indicates , A density of 0.30 g / cm 3 , a thickness of 12 mm, and sound absorption characteristics of a perforated soft fiber board for sound absorption. As is clear from FIG. 5, the sound absorbing soft fiber board conforming to JIS A-5905 generally has improved sound absorbing property due to the perforation process. However, since the holes are exposed on the surface, there is a problem in that the appearance is not preferable. The present invention has been made in view of the above circumstances, holes are not exposed on the surface,
It is intended to provide a sound absorbing plate having a high bending strength and a good sound absorbing property.
【０００５】[0005]
【課題を解決するための手段】本発明の吸音板は、木質
繊維を固化して形成された吸音層上に、粉粒体を固化し
て形成された多孔質表面化粧層を積層することを前記課
題の解決手段とした。The sound absorbing plate of the present invention comprises a sound absorbing layer formed by solidifying wood fibers, and a porous surface decorative layer formed by solidifying powder and granules on the sound absorbing layer. It was taken as a means for solving the above problems.
【０００６】[0006]
【作用】本発明においては、吸音層上に、表面化粧層と
して粉粒体からなる多孔質表面化粧層を積層することに
より、吸音板の曲げ強度を向上させることができる。ま
た、この多孔質表面化粧層は、粉粒体を固着したもので
あるので空隙が生じ、音波を効率よく吸音層に侵入させ
ることができ、吸音層が本来有している優れた吸音特性
を維持することができる。In the present invention, the bending strength of the sound absorbing plate can be improved by laminating a porous surface decorative layer made of powder particles as a surface decorative layer on the sound absorbing layer. In addition, since this porous surface decorative layer is one in which powder particles are fixed, voids are generated, and sound waves can be efficiently introduced into the sound absorbing layer, and the excellent sound absorbing characteristics originally possessed by the sound absorbing layer are provided. Can be maintained.
【０００７】[0007]
【実施例】以下、本発明を詳しく説明する。図１は本発
明の一実施例を示したもので、符号１は本発明の吸音板
である。この吸音板１は、木質繊維が固化されてなる吸
音層２と、粉粒体が固化されてなる多孔質表面化粧層３
から構成される。この吸音層１で用いられる木質繊維
は、製材廃材などを解繊に適する大きさの木材小片にし
たのち、この木材小片を解繊し、繊維状にしたものであ
る。The present invention will be described in detail below. FIG. 1 shows an embodiment of the present invention. Reference numeral 1 is a sound absorbing plate of the present invention. The sound absorbing plate 1 includes a sound absorbing layer 2 formed by solidifying wood fibers, and a porous surface decorative layer 3 formed by solidifying powder particles.
Composed of. The wood fiber used in the sound absorbing layer 1 is obtained by making waste wood and the like into small pieces of wood suitable for defibration, and then defibrating the small pieces of wood to form a fibrous shape.
【０００８】上記製材廃材は、スギ、ヒノキなどの針葉
樹、ブナなどの広葉樹の一樹種または数樹種が混合して
用いられるが、樹種によって繊維の質が異なるため、一
定の品質の木質板材を得るには、一樹種の製材廃材を用
いるのが好ましいが、経済的には多種を混合した方が好
ましい。上記木材小片の大きさは、木質板材の曲げ強度
に影響があり、大きさが小さくなると、強度が低下する
ため、目的とする木質板材の品質によってその大きさは
異なるが、その形状を直方体状とした場合、幅約１．０
〜３０mm、長さ約３．０〜５０mm、厚さ約０．１〜５．
０mm程度が好ましい。The above-mentioned waste lumber is used as a mixture of one or several species of coniferous trees such as cedar and cypress, and broad-leaved trees such as beech. Since the quality of the fiber differs depending on the species, a wood board of constant quality is obtained. For this purpose, it is preferable to use a lumber waste material of one tree species, but it is preferable to mix a plurality of kinds economically. The size of the above-mentioned small pieces of wood affects the bending strength of the wooden board, and when the size becomes smaller, the strength decreases, so the size varies depending on the quality of the target wooden board, but its shape is a rectangular parallelepiped. If, and width is about 1.0
~ 30 mm, length about 3.0-50 mm, thickness about 0.1-5.
About 0 mm is preferable.
【０００９】木質繊維の繊維の長さは、約１〜１００mm
程度で、目的とする吸音板の品質によって、さらに繊維
の長さを特定範囲に揃えたり、選別することが好まし
い。The length of the wood fiber is about 1 to 100 mm.
It is preferable that the lengths of the fibers are further aligned in a specific range or selected according to the intended quality of the sound absorbing plate.
【００１０】また、吸音板１の強度増加のために、木質
繊維に補強用繊維材を混入することもできる。この補強
用繊維材は、アラミド繊維などの高弾性率高強度有機繊
維、カーボン繊維、無機質繊維などで、その繊維の長さ
は約１〜１００mm程度が好ましく、混入量は木質繊維中
約３〜５０重量％が好ましい。Further, in order to increase the strength of the sound absorbing plate 1, it is possible to mix a reinforcing fiber material into the wood fiber. The reinforcing fiber material is a high elastic modulus and high strength organic fiber such as aramid fiber, carbon fiber, inorganic fiber or the like, and the length of the fiber is preferably about 1 to 100 mm, and the mixing amount is about 3 to 10 in the wood fiber. 50% by weight is preferred.
【００１１】上記吸音層２は、上記木質繊維に、熱硬化
型合成樹脂などからなる接着剤を混合し、層状に堆積さ
せた後、加圧加熱下で固化させたものである。ここで、
上記接着剤としては、ユリア樹脂、メラミン樹脂、フェ
ーノル樹脂、エポキシ樹脂、ウレタン樹脂、アクリル樹
脂などの液状接着剤、あるいは、酢酸ビニル樹脂、フェ
ノール樹脂などの粉末状接着剤を用いることができる。
これらの接着剤の吸音層中の含有量は約３〜３０重量％
の範囲であることが好ましい。この接着剤の量が多すぎ
ると、吸音層２が高比重化するとともに、多孔質性が失
われることになるので好ましくない。上記吸音層２は、
層厚約５〜３０mm、密度約０．１〜０．４g/cm3程度が
好ましく、さらに目的とする吸音板１の用途によって、
木質繊維の堆積量を調整して、吸音層２の層厚を変えて
もよい。The sound absorbing layer 2 is formed by mixing the wood fiber with an adhesive made of a thermosetting synthetic resin, depositing the adhesive in layers, and then solidifying it under pressure and heating. here,
As the adhesive, a liquid adhesive such as urea resin, melamine resin, phenol resin, epoxy resin, urethane resin or acrylic resin, or a powdery adhesive such as vinyl acetate resin or phenol resin can be used.
The content of these adhesives in the sound absorbing layer is about 3 to 30% by weight.
It is preferably in the range of. If the amount of this adhesive is too large, the sound absorbing layer 2 has a high specific gravity and the porosity is lost, which is not preferable. The sound absorbing layer 2 is
A layer thickness of about 5 to 30 mm and a density of about 0.1 to 0.4 g / cm 3 are preferable, and depending on the intended use of the sound absorbing plate 1,
The layer thickness of the sound absorbing layer 2 may be changed by adjusting the deposition amount of the wood fiber.
【００１２】上記吸音層２上には、多孔質表面化粧層３
が積層されている。多孔質表面化粧層３は、粉粒体が接
着剤で固化されてなるものである。この多孔質表面化粧
層３で用いられる粉粒体は、仕上がり強度を向上させる
ため、ある程度硬いものが好ましく、例えば天然石、セ
ラミックス、硬質プラスチック、および金属などからな
る、粒径が０．１〜１０mm程度の粉粒体が好ましい。こ
の粉粒体の粒径は均一である必要はない。またこの粉粒
体の形状は球形でなくてもよく、不定形の粗砕片でもよ
い。A porous surface decorative layer 3 is provided on the sound absorbing layer 2.
Are stacked. The porous surface decorative layer 3 is formed by solidifying powder particles with an adhesive. The powdery particles used in the porous surface decorative layer 3 are preferably hard to some extent in order to improve the finish strength, and for example, are made of natural stone, ceramics, hard plastic, metal, etc., and have a particle size of 0.1 to 10 mm. Granules of the order of magnitude are preferred. The particle size of this powder does not have to be uniform. Further, the shape of the powder and granules does not have to be spherical, and may be indefinite coarse crushed pieces.
【００１３】上記多孔質表面化粧層３は、上記粉粒体
に、熱硬化型合成樹脂からなる接着剤を混合して、層状
に堆積させた後、加圧加熱下で固化させたものである。
ここで、上記接着剤としては、上述の吸音層２の形成に
おいて用いたものでよい。接着剤の多孔質表面化粧層３
中の含有量は、約３〜２０重量％の範囲であることが好
ましい。ここで接着剤の量が多すぎると、多孔質表面化
粧層３が高比重化するとともに、多孔質性が失われるこ
とになるので好ましくない。上記多孔質表面化粧層３
は、層厚約２〜２０mm、密度約０．５〜２．０g/cm3程
度が好ましく、さらに目的とする吸音板１の用途によっ
て、粉粒体の堆積量を調整して、多孔質表面化粧層３の
層厚を変えてもよい。The porous surface decorative layer 3 is obtained by mixing the powdery particles with an adhesive made of a thermosetting synthetic resin, depositing them in layers, and then solidifying them under pressure and heating. .
Here, the adhesive used may be the one used in forming the sound absorbing layer 2 described above. Adhesive porous surface decorative layer 3
The content therein is preferably in the range of about 3 to 20% by weight. Here, if the amount of the adhesive is too large, the porous surface decorative layer 3 has a high specific gravity and the porosity is lost, which is not preferable. The porous surface decorative layer 3
Is preferably about 2 to 20 mm in layer thickness and about 0.5 to 2.0 g / cm 3 in density. Furthermore, by adjusting the amount of powder particles to be deposited according to the intended use of the sound absorbing plate 1, a porous surface can be obtained. The layer thickness of the decorative layer 3 may be changed.
【００１４】このような構成の吸音板１は、ＪＩＳ Ａ
−５９０５のＡ級インシュレーションボードの規格であ
る曲げ強さ約２０kg／cm2以上を実現し、かつ吸音性が
良好で、外観の優れたものである。The sound absorbing plate 1 having such a structure is compliant with JIS A
It has a bending strength of about 20 kg / cm 2 or more, which is the standard for class A insulation board of -5905, and has good sound absorption and an excellent appearance.
【００１５】次に、上述のように構成された本発明の吸
音板の製法について説明する。図２は本発明の吸音板の
製法の一例の概略を示したものである。まず粉粒体に上
記液状接着剤を含浸、あるいは上記粉末状接着剤を散布
することにより、粉粒体に接着剤を塗布する。そして、
この接着剤を塗布した粉粒体４を一体成型用の型５に充
填し、粉粒体堆積層４とする。Next, a method of manufacturing the sound absorbing plate of the present invention constructed as described above will be described. FIG. 2 shows an outline of an example of a method for manufacturing the sound absorbing plate of the present invention. First, the powdery or granular material is impregnated with the liquid adhesive or the powdery adhesive is sprayed to apply the adhesive to the powdery or granular material. And
The granular material 4 coated with this adhesive is filled in a mold 5 for integral molding to form a granular material deposit layer 4.
【００１６】ついで上記木質繊維に上記液状接着剤を含
浸、あるいは上記粉末状接着剤を散布することにより、
木質繊維に接着剤を塗布する。そして上述の型５中の粉
粒体堆積層４の上に、この接着剤を塗布した木質繊維を
充填して、木質繊維堆積層６とする。この後、型５内の
両堆積層４、６に対して、プレス機７を用いて、５〜１
０kg/cm2程度に加圧し、さらに温度を１００〜１５０℃
程度まで上げる。そしてこの加熱加圧状態を、１５〜３
０分程度保持して上記接着剤を硬化させ、型５から外し
て吸音板を得る。Then, by impregnating the wood fiber with the liquid adhesive or by spraying the powdery adhesive,
Apply adhesive to the wood fibers. Then, the wood fiber deposited layer 6 in the mold 5 is filled with wood fibers coated with this adhesive to form a wood fiber deposited layer 6. After that, with respect to both the deposition layers 4 and 6 in the mold 5, the press machine 7 is used to
Pressurize to about 0kg / cm 2 and further heat at 100-150 ℃
Raise to a degree. And this heating and pressurizing state is set to 15 to 3
After holding for about 0 minutes to cure the adhesive, it is removed from the mold 5 to obtain a sound absorbing plate.
【００１７】（実施例）表１に示した組成により、吸音
層厚み２０mm、表面化粧層厚み５mmの５種類の本発明の
吸音板（実施例１ないし実施例５）を作成した。接着剤
としては、ウレタン樹脂系接着剤（住友バイエルウレタ
ン社製Ｐ０４９７および０４１８を混合したもの）を用
いた。得られた吸音板の曲げ強度および垂直入射吸音率
を測定した。これらの曲げ強度の測定結果を併せて表１
に示す。また実施例１、実施例３、実施例４の垂直入射
吸音率の測定結果を図３に示す。(Examples) Using the compositions shown in Table 1, five types of sound absorbing plates of the present invention (Examples 1 to 5) having a sound absorbing layer thickness of 20 mm and a surface decorative layer thickness of 5 mm were prepared. As the adhesive, a urethane resin adhesive (a mixture of P0497 and 0418 manufactured by Sumitomo Bayer Urethane Co., Ltd.) was used. The bending strength and the normal incident sound absorption coefficient of the obtained sound absorbing plate were measured. The measurement results of these bending strengths are also shown in Table 1.
Shown in. In addition, the measurement results of the normal incident sound absorption coefficient of Examples 1, 3 and 4 are shown in FIG.
【００１８】（比較例）表１に示した組成により、密度
０．２g/cm3、厚み２５mmの吸音層のみ有する吸音板を
作成し、上記実施例と同様に、曲げ強度および垂直入射
吸音率を測定した。その結果を併せて表１および図３に
示す。(Comparative Example) A sound absorbing plate having only a sound absorbing layer having a density of 0.2 g / cm 3 and a thickness of 25 mm was prepared from the composition shown in Table 1, and bending strength and normal incident sound absorption coefficient were prepared in the same manner as in the above Examples. Was measured. The results are also shown in Table 1 and FIG.
【００１９】[0019]
【表１】 [Table 1]
【００２０】図３の結果より、実施例１，実施例３，実
施例４および比較例で得られた吸音板は、いずれも２０
００Ｈｚ付近でほぼ１００％の吸音率を示しており、吸
音特性が良好であることが確認できた。一方、表１の結
果より、比較例１で得られた吸音板に比べて、実施例１
〜実施例５で得られた吸音板は、曲げ強度が大幅に向上
していることが示された。From the results shown in FIG. 3, the sound absorbing plates obtained in Examples 1, 3 and 4 and Comparative Example were all 20
The sound absorption coefficient was almost 100% near 00 Hz, and it was confirmed that the sound absorption characteristics were good. On the other hand, from the results of Table 1, as compared with the sound absorbing plate obtained in Comparative Example 1, Example 1
-It was shown that the sound absorbing plate obtained in Example 5 has a significantly improved bending strength.
【００２１】[0021]
【発明の効果】以上説明したように本発明の吸音板は、
木質繊維を固化して形成された吸音層上に、粉粒体を固
化して形成された多孔質表面化粧層を積層してなるもの
である。したがって、吸音層が本来有している優れた吸
音特性を維持しつつ、曲げ強度が向上され、かつ外観の
優れた吸音板となる。As described above, the sound absorbing plate of the present invention is
A sound absorbing layer formed by solidifying wood fibers is laminated with a porous surface decorative layer formed by solidifying powder particles. Therefore, the sound absorbing plate has improved bending strength and excellent appearance while maintaining the excellent sound absorbing property originally possessed by the sound absorbing layer.
【００２２】また本発明の製法は、型内に、接着剤を塗
布した粉粒体を充填した後、接着剤を塗布した木質繊維
を充填し、加熱および加圧して、一体成型することを特
徴とするものである。したがって上記吸音板を容易に製
造することができる。Further, the manufacturing method of the present invention is characterized in that a mold is filled with an adhesive-applied powder or granular material, and then an adhesive-applied wood fiber is filled, and heated and pressed to integrally mold. It is what Therefore, the sound absorbing plate can be easily manufactured.
【図１】 本発明の吸音板の一実施例を示した断面図で
ある。FIG. 1 is a sectional view showing an embodiment of a sound absorbing plate of the present invention.
【図２】 本発明の吸音板の製法の一実施例を示した概
略断面図である。FIG. 2 is a schematic cross-sectional view showing an example of a method for manufacturing a sound absorbing plate of the present invention.
【図３】 本発明の吸音板の実施例及び比較例の垂直入
射吸音特性を示したグラフである。FIG. 3 is a graph showing normal-incidence sound absorption characteristics of an example and a comparative example of the sound absorbing plate of the present invention.
【図４】 従来の軟質繊維板の垂直入射吸音特性を示し
たグラフである。FIG. 4 is a graph showing a normal incidence sound absorption characteristic of a conventional soft fiber board.
【図５】 従来の吸音用軟質繊維板の垂直入射吸音特性
を示したグラフである。FIG. 5 is a graph showing normal incident sound absorption characteristics of a conventional sound absorbing soft fiber board.
１…吸音板、２…吸音層、３…多孔質表面化粧層、４…
粉粒体堆積層、５…型６…木質繊維堆積層、７…プレス
機1 ... Sound absorbing plate, 2 ... Sound absorbing layer, 3 ... Porous surface decorative layer, 4 ...
Powder / accumulation layer, 5 ... Mold 6 ... Wood fiber deposition layer, 7 ... Press machine
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ１０Ｋ 11/16 Ｄ 7406−5Ｈ (72)発明者 水野 保明 静岡県浜松市中沢町10番１号 ヤマハ株式 会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical indication location G10K 11/16 D 7406-5H (72) Inventor Yasuaki Mizuno 10-1 Nakazawa-machi, Hamamatsu-shi, Shizuoka Yamaha Stock Company
Claims (2)
に、粉粒体を固化して形成された多孔質表面化粧層を積
層してなることを特徴とする吸音板。1. A sound absorbing plate comprising a sound absorbing layer formed by solidifying wood fibers, and a porous surface decorative layer formed by solidifying powder particles, laminated on the sound absorbing layer.
して粉粒体堆積層を形成した後、この上に接着剤を塗布
した木質繊維を充填して木質繊維堆積層を形成し、これ
を加熱および加圧して、一体成型することを特徴とする
吸音板の製法。2. A mold is filled with an adhesive-coated powder or granular material to form a powder- or granular-material deposit layer, and then an adhesive-coated wood fiber is filled thereon to form a wood-fiber deposited layer. A method for manufacturing a sound absorbing plate, which is characterized in that the sound absorbing plate is formed and heated and pressed to be integrally molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4194307A JPH0631701A (en) | 1992-07-21 | 1992-07-21 | Acoustic board and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4194307A JPH0631701A (en) | 1992-07-21 | 1992-07-21 | Acoustic board and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0631701A true JPH0631701A (en) | 1994-02-08 |
Family
ID=16322431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4194307A Withdrawn JPH0631701A (en) | 1992-07-21 | 1992-07-21 | Acoustic board and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0631701A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100636903B1 (en) * | 2004-09-15 | 2006-10-19 | (주)석광테크 | Mat and method of manufacturing the same |
-
1992
- 1992-07-21 JP JP4194307A patent/JPH0631701A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100636903B1 (en) * | 2004-09-15 | 2006-10-19 | (주)석광테크 | Mat and method of manufacturing the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19991005 |