JPH06172009A - Wood cement board - Google Patents
Wood cement boardInfo
- Publication number
- JPH06172009A JPH06172009A JP34555792A JP34555792A JPH06172009A JP H06172009 A JPH06172009 A JP H06172009A JP 34555792 A JP34555792 A JP 34555792A JP 34555792 A JP34555792 A JP 34555792A JP H06172009 A JPH06172009 A JP H06172009A
- Authority
- JP
- Japan
- Prior art keywords
- mica
- cement
- wood
- reinforcing material
- cement board
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は木質補強材によって補強
されたセメント板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement board reinforced with a wood reinforcing material.
【０００２】[0002]
【従来の技術】従来はセメント板の補強材としては石綿
が使用されていたが、石綿微粉末の飛散によって環境汚
染が問題となり、石綿に代わる補強材として木片や木質
繊維が用いられるようになった。2. Description of the Related Art Asbestos has conventionally been used as a reinforcing material for cement boards, but environmental pollution is a problem due to the scattering of asbestos fine powder, and wood chips and wood fibers have come to be used as a reinforcing material instead of asbestos. It was
【０００３】しかしながら木質補強材で補強したセメン
ト板は寸法安定性に劣り、乾燥吸湿によって伸縮し亀裂
やそり等が起り易いと云う欠点がある。このような欠点
を改良するためには該セメント板を高温高圧にてオート
クレーブ養生してセメントの硬化反応を出来るだけ完全
に行なわせることが必要であるが、このような高温高圧
下では木質補強材が劣化して補強効果が損なわれる。However, a cement board reinforced with a wood reinforcing material has poor dimensional stability, and has the drawback that it tends to expand and contract due to drying and absorbing moisture, causing cracks and warpage. In order to improve such a defect, it is necessary to cure the cement board at high temperature and high pressure in an autoclave so that the hardening reaction of cement is carried out as completely as possible. Deteriorates and the reinforcing effect is impaired.
【０００４】上記欠点を高温高圧のオートクレーブ養生
を行なうことなく改良する方法として、木質補強材とセ
メントの混合物にマイカを添加することが提案されてい
る（例えば特公昭５７−４２５８０号、特開昭６０−２
２６４３９号、特開平２−１４１４４６号）。マイカは
高弾性率を有し５〜３０重量％程度の添加によって木質
セメント板の寸法安定性および切断性、釘打ち性等を大
巾に改良するものである。As a method for improving the above-mentioned drawbacks without performing autoclave curing at high temperature and high pressure, it has been proposed to add mica to a mixture of a wood reinforcing material and cement (for example, Japanese Patent Publication No. 57-42580). 60-2
26439, JP-A-2-141446). Mica has a high elastic modulus, and by adding about 5 to 30% by weight, the dimensional stability, cutting property, nailing property, etc. of the wood cement board are greatly improved.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら上記従来
技術にあっては、木質セメント板の表面に多量のマイカ
が存在すると塗装を施した時にマイカには浸液性がない
ので塗料が繊維セメント板表面から内部に均一に浸透す
ることが出来ず、マイカが露出した所の塗膜の密着性が
悪くなると云う問題点があった。However, in the above-mentioned prior art, when a large amount of mica is present on the surface of the wood cement board, the mica does not have a liquid immersion property when applied, so that the paint is on the surface of the fiber cement board. Therefore, there is a problem in that it cannot penetrate into the inside uniformly, and the adhesion of the coating film at the place where the mica is exposed deteriorates.
【０００６】[0006]
【課題を解決するための手段】本発明は上記従来の課題
を解決するための手段として、木質補強材とセメントと
を主体とし３重量％以下のマイカを含有した混合物の硬
化層からなる表層部と、木質補強材とセメントとを主体
としマイカが添加された混合物の硬化層からなる内層部
とを有する木質セメント板を提供するものである。As a means for solving the above-mentioned conventional problems, the present invention provides a surface layer portion composed of a hardened layer of a mixture mainly composed of a wood reinforcing material and cement and containing 3% by weight or less of mica. And a wood cement board having an inner layer portion consisting of a hardened layer of a mixture containing a wood reinforcing material and cement as a main component and containing mica.
【０００７】本発明において用いられる木質補強材とし
ては木片、木毛、木質パルプ等、従来の木質セメント板
に用いられる木質補強材と同様なものがある。望ましい
木質補強材としては巾０．５〜２mm、長さ１〜２０mm、
アスペクト比（長さ／厚み）２０〜３０の木片がある。The wood reinforcing material used in the present invention includes wood chips, wood wool, wood pulp and the like similar to the wood reinforcing material used in the conventional wood cement board. Width 0.5 to 2 mm, length 1 to 20 mm as a preferable wood reinforcing material,
There are wood chips with an aspect ratio (length / thickness) of 20 to 30.
【０００８】本発明において用いられるセメントとして
は、ポルトランドセメント、高炉スラグセメント、シリ
カセメント、フライアッシュセメント、アルミナセメン
ト等が例示される。Examples of the cement used in the present invention include Portland cement, blast furnace slag cement, silica cement, fly ash cement and alumina cement.
【０００９】本発明において用いられるマイカは望まし
くは径が１００〜１１００μm 、アスペクト比が８０〜
９０のフレーク状のものである。The mica used in the present invention preferably has a diameter of 100 to 1100 μm and an aspect ratio of 80 to.
90 flakes.
【００１０】上記セメント、木質補強材、およびマイカ
は表層部においては通常セメント６６〜７５重量％、木
質補強材２５〜３４重量％、マイカ３重量％以下、内層
部においては通常セメント５６〜７４重量％、木質補強
材２１〜２６重量％、マイカ５〜２０重量％の割合で混
合されるが、内層部には表層部のマイカを制限した分マ
イカの重量を増やすことが望ましい。そして得られる木
質セメント板全体に対してマイカの添加量を５〜２０重
量部とすることが望ましい。上記混合物においては更に
セメントの一部に代えてケイ砂、ケイ石粉、シリカヒュ
ーム、シラスバルーン、パーライト、ベントナイト、ケ
イソウ土等の充填剤を置換してもよいし、あるいは塩化
カルシウム、塩化マグネシウム、硫酸アルミニウム、ア
ルミン酸ソーダ、水ガラス等のセメント硬化促進剤が添
加されてもよい。The above cement, wood reinforcing material and mica are usually cement 66-75% by weight in the surface layer portion, wood reinforcing material 25-34% by weight, mica 3% by weight or less, and normal cement 56-74% by weight in the inner layer portion. %, The wood reinforcing material 21 to 26% by weight, and the mica 5 to 20% by weight, but it is desirable to increase the weight of the mica in the inner layer part by limiting the mica in the surface layer part. Then, it is desirable that the addition amount of mica is 5 to 20 parts by weight with respect to the whole wood cement board obtained. In the above mixture, silica sand, silica stone powder, silica fume, shirasu balloon, perlite, bentonite, diatomaceous earth or the like may be substituted for a part of the cement, or calcium chloride, magnesium chloride, sulfuric acid. A cement hardening accelerator such as aluminum, sodium aluminate, or water glass may be added.
【００１１】本発明の木質セメント板を製造するには、
上記マイカ含有量３重量％以下の混合物（ａ）とマイカ
含有量５重量％以上の混合物（ｂ）に夫々水を添加して
混練したスラリーを別個にネット上に抄造脱水し、マイ
カ含有量３重量％以下の混合物からなるシート（Ａ）と
マイカ含有量５重量％以上の混合物のシート（Ｂ）とを
形成する。該シート（Ｂ）を内側に配しシート（Ａ）を
表側および／または裏側に配して積層し、該積層シート
を圧締硬化させ、更に所望ならばオートクレーブ養生す
る湿式法、あるいは上記混合物（ａ）と混合物（ｂ）に
夫々３０〜４５重量％程度の水を添加混合して加水混合
物（ａ’），（ｂ’）とし、上記混合物（ａ’）を型板
上に散布してマットをフォーミングし、その上に混合物
（ｂ’）を散布してマットをフォーミングし、更に所望
なればその上から混合物（ａ’）を散布してマットをフ
ォーミングし、このようにしてフォーミングされた積層
マットを圧締硬化させ、更に所望ならばオートクレーブ
養生する半乾式法が適用される。このようにして本発明
の木質セメント板が製造されるが、本発明の木質セメン
ト板のマイカ含有量３重量％以下の表層部の厚みは通常
１〜４mm程度、マイカ含有量５重量％以上の内層部の厚
みは通常５〜１３mm程度とされる。To produce the wood cement board of the present invention,
Water was added to each of the mixture (a) having a mica content of 3% by weight or less and the mixture (b) having a mica content of 5% by weight or more to knead the slurry separately for papermaking on a net to obtain a mica content of 3 A sheet (A) made of a mixture of not more than wt% and a sheet (B) of a mixture having a mica content of not less than 5 wt% are formed. The sheet (B) is placed on the inner side and the sheet (A) is placed on the front side and / or the back side to be laminated, the laminated sheet is pressure-hardened, and further, if desired, an autoclave curing method, or the above mixture ( About 30 to 45% by weight of water is added to and mixed with a) and the mixture (b) to prepare water-mixtures (a ') and (b'), and the mixture (a ') is sprinkled on the template to make a mat. And then the mixture (b ') is sprinkled onto the mat to form a mat, and if desired, the mixture (a') is sprinkled onto the mat to form a mat. A semi-dry method is applied in which the mat is pressure-hardened and, if desired, autoclaved. The wood cement board of the present invention is produced in this manner. The thickness of the surface layer portion of the wood cement board of the present invention having a mica content of 3% by weight or less is usually about 1 to 4 mm, and the mica content of 5% by weight or more. The thickness of the inner layer portion is usually about 5 to 13 mm.
【００１２】本発明においては塗装面にのみマイカ含有
量３重量％以下の表層部を配すればよく、したがって本
発明においては、表層部と内層部からなる二層構造、内
層部の両面に表裏層部を配した三層構造のどちらも包含
される。In the present invention, the surface layer portion having a mica content of 3% by weight or less may be provided only on the coated surface. Therefore, in the present invention, a two-layer structure comprising the surface layer portion and the inner layer portion, and the front and back surfaces on both sides of the inner layer portion. Both of the three-layer structure in which the layer portions are arranged are included.
【００１３】[0013]
【作用】本発明の木質セメント板においては、環境を汚
染しない木質補強材によってセメント硬化層が補強され
ているが、木質補強材による補強は寸法安定性に劣る。
したがって本発明は更にマイカを添加するが、マイカは
吸湿性がなく剛性高弾性体であり、木質セメント板の寸
法安定性を大巾に改良する。しかしマイカが３重量％を
越えた量で木質セメント板表面に存在すると、マイカに
は浸液性がないので塗装した場合に塗膜の密着性が低く
なる。そこでマイカ含有木質セメント層を内層部に配
し、塗装される表層部はマイカ含有量３重量％以下の木
質セメント層を配する。しかし表層部のマイカ含有量を
少なくした分内層部のマイカ含有量を増加すれば木質セ
メント板の安定性は低下することはない。マイカ含有量
３重量％以下の表層部は浸液性を有するので塗料が表面
から浸透することが出来、塗膜の密着性は大巾に改良さ
れる。In the wood cement board of the present invention, the hardened cement layer is reinforced by the wood reinforcing material which does not pollute the environment, but the reinforced by the wood reinforcing material is inferior in dimensional stability.
Therefore, in the present invention, mica is further added, but the mica is a rigid and highly elastic body without hygroscopicity, and greatly improves the dimensional stability of the wood cement board. However, when mica is present on the surface of the wood cement board in an amount exceeding 3% by weight, the adhesion of the coating film becomes low when it is coated because mica has no liquid immersion property. Therefore, the mica-containing wood cement layer is arranged in the inner layer part, and the surface layer part to be coated is arranged with the mica content of 3% by weight or less. However, if the mica content in the surface layer is reduced and the mica content in the inner layer is increased, the stability of the wood cement board does not decrease. Since the surface layer portion having a mica content of 3% by weight or less has a liquid immersion property, the coating material can penetrate from the surface, and the adhesiveness of the coating film is greatly improved.
【００１４】[0014]
【実施例】表１に示す組成の混合物を使用して表裏層部
と内層部とを有する木質セメント板である本発明の試料
１，２および表層部と内層部とを有する木質セメント板
である本発明の試料３および比較試料１，２，３を作成
した。セメントは普通ポルトランドセメント（住友セメ
ント社製）を使用し、木片はチップをフレーカー（パー
ルマン社製）で細片化して平均巾１．３mm、平均長さ１
２mm、平均アスペクト比２４としたものを使用し、マイ
カはクラライトマイカ（クラレ社製）、平均粒径２８０
μｍ、平均アスペクト比８５のものを使用し、セメント
硬化促進剤は１重量％の塩化カルシウムを使用した。EXAMPLES Samples 1 and 2 of the present invention, which are wood cement boards having front and back layers and an inner layer, and a wood cement board having a surface layer and an inner layer, were prepared by using a mixture having the composition shown in Table 1. Sample 3 of the present invention and comparative samples 1, 2, 3 were prepared. As the cement, ordinary Portland cement (Sumitomo Cement Co., Ltd.) is used, and the wood chips are made into chips with flakers (Pearlman Co.), with an average width of 1.3 mm and an average length of 1
2 mm, average aspect ratio 24, mica is Clarite mica (Kuraray Co., Ltd.), average particle size 280
The cement hardening accelerator used was 1 μm and calcium chloride was 1% by weight.
【００１５】試料１，２および比較試料１，２，３につ
いては、下型板上に表１に示す表層部組成の混合物を所
定量を散布して表層マットをフォーミングし、その上に
上記内層部組成の混合物を所定量散布して内層マットを
フォーミングし、更にその上から上記表層部組成の混合
物を所定量散布して裏層マットをフォーミングし、その
上から上型板を当接し、圧力２０kgf ／cm2 で圧締し温
度６０〜８０℃、相対湿度６０％以上の雰囲気中で２４
時間養生することにより三層構造の木質セメント板と
し、試料３については同様に表１に示す表層部組成の混
合物を所定量を散布して表層マットをフォーミングし、
その上に上記内層部組成の混合物を所定量散布して内層
マットをフォーミングした後その上に裏層マットをフォ
ーミングすることなく同様の条件で圧締養生を行ない二
層構造の木質セメント板とする。このようにして得られ
た各試料の比重および表層部と内層部の厚みを表１に示
す。For Samples 1 and 2 and Comparative Samples 1, 2, and 3, a predetermined amount of the mixture having the composition of the surface layer portion shown in Table 1 was sprinkled on the lower template to form a surface mat, and the inner layer was formed thereon. A predetermined amount of a mixture of parts composition is sprayed to form an inner layer mat, and a predetermined amount of a mixture of the surface layer composition is spread from above to form a back layer mat, and an upper template is abutted from above, and pressure is applied. 24 kg in an atmosphere with a pressure of 20 kgf / cm 2 and a temperature of 60-80 ° C and relative humidity of 60% or more.
A three-layer structured wood cement board was obtained by curing for a period of time. Sample 3 was similarly sprayed with a predetermined amount of a mixture having a surface layer composition shown in Table 1 to form a surface mat.
A predetermined amount of the mixture of the composition of the inner layer portion is sprayed on the inner layer mat to form an inner layer mat, and then a back layer mat is not formed on the inner layer mat to perform compression curing under the same conditions to obtain a two-layer structure wood cement board. . Table 1 shows the specific gravities and the thicknesses of the surface layer portion and the inner layer portion of each sample thus obtained.
【００１６】[0016]
【表１】 [Table 1]
【００１７】上記各試料について曲げ強度、吸水長さ変
化率、吸水率、凍結融解性能、塗膜評価および塗膜密着
性の各試験を行なった。その結果を表２に示す。Each of the above-mentioned samples was tested for bending strength, water absorption length change rate, water absorption rate, freeze-thaw performance, coating film evaluation and coating film adhesion. The results are shown in Table 2.
【００１８】[0018]
【表２】 [Table 2]
【００１９】表２をみると本発明の試料１，２，３は強
度、寸法安定性に優れ、かつ塗装性も良好であるが、表
裏層部にマイカを４重量％以上添加した比較試料１，２
は塗装性が劣り、また表内層部にマイカを添加しない比
較試料３は寸法安定性に劣る。Table 2 shows that Samples 1, 2 and 3 of the present invention are excellent in strength and dimensional stability and have good coatability, but Comparative Sample 1 containing 4% by weight or more of mica in the front and back layers. , 2
Is inferior in coatability, and Comparative Sample 3 in which mica is not added to the inner surface layer is inferior in dimensional stability.
【００２０】[0020]
【発明の効果】したがって、本発明においては強度が大
きくかつ寸法安定性に優れ、その上塗装性が良好な木質
セメント板が得られる。Therefore, according to the present invention, it is possible to obtain a wood cement board which has high strength, excellent dimensional stability and good paintability.
Claims (1)
％以下のマイカを含有した混合物の硬化層からなる表層
部と、木質補強材とセメントとを主体としマイカが添加
された混合物の硬化層からなる内層部とを有することを
特徴とする木質セメント板1. A surface layer portion consisting of a hardened layer of a mixture mainly composed of a wood reinforcing material and cement and containing 3% by weight or less of mica, and a hardening of a mixture mainly composed of a wooden reinforcing material and cement and to which mica is added. Wood cement board characterized by having an inner layer part consisting of layers
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34555792A JP2754306B2 (en) | 1992-10-09 | 1992-11-30 | Wood cement board |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29921492 | 1992-10-09 | ||
| JP4-299214 | 1992-10-09 | ||
| JP34555792A JP2754306B2 (en) | 1992-10-09 | 1992-11-30 | Wood cement board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06172009A true JPH06172009A (en) | 1994-06-21 |
| JP2754306B2 JP2754306B2 (en) | 1998-05-20 |
Family
ID=26561831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34555792A Expired - Fee Related JP2754306B2 (en) | 1992-10-09 | 1992-11-30 | Wood cement board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2754306B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0867547A (en) * | 1994-08-26 | 1996-03-12 | Nichiha Corp | Wood cement board |
| JPH10194812A (en) * | 1996-12-26 | 1998-07-28 | M & K:Kk | Diatom wood fiber cement board |
| JP2002128558A (en) * | 2000-10-23 | 2002-05-09 | Nichiha Corp | Wood cement board |
| JP2002166406A (en) * | 2000-12-01 | 2002-06-11 | Nichiha Corp | Method for manufacturing woody cement board |
| JP2002187759A (en) * | 2000-12-21 | 2002-07-05 | Nichiha Corp | Wood cement board manufacturing method |
| JP2018052767A (en) * | 2016-09-28 | 2018-04-05 | ニチハ株式会社 | Manufacturing method of building material and building material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54133511A (en) * | 1978-04-10 | 1979-10-17 | Matsushita Electric Works Ltd | Production of plate for building |
| JPH02141446A (en) * | 1988-07-18 | 1990-05-30 | Asuku:Kk | Production of woody-inorganic board |
-
1992
- 1992-11-30 JP JP34555792A patent/JP2754306B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54133511A (en) * | 1978-04-10 | 1979-10-17 | Matsushita Electric Works Ltd | Production of plate for building |
| JPH02141446A (en) * | 1988-07-18 | 1990-05-30 | Asuku:Kk | Production of woody-inorganic board |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0867547A (en) * | 1994-08-26 | 1996-03-12 | Nichiha Corp | Wood cement board |
| JPH10194812A (en) * | 1996-12-26 | 1998-07-28 | M & K:Kk | Diatom wood fiber cement board |
| JP2002128558A (en) * | 2000-10-23 | 2002-05-09 | Nichiha Corp | Wood cement board |
| JP2002166406A (en) * | 2000-12-01 | 2002-06-11 | Nichiha Corp | Method for manufacturing woody cement board |
| JP2002187759A (en) * | 2000-12-21 | 2002-07-05 | Nichiha Corp | Wood cement board manufacturing method |
| JP2018052767A (en) * | 2016-09-28 | 2018-04-05 | ニチハ株式会社 | Manufacturing method of building material and building material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2754306B2 (en) | 1998-05-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5945044A (en) | Wood cement board and a manufacturing method thereof | |
| CN1048235C (en) | Refractory covering materials | |
| JP2006062883A (en) | Wood cement board and manufacturing method thereof | |
| JP2002166406A (en) | Method for manufacturing woody cement board | |
| JP4648668B2 (en) | Inorganic board and method for producing the same | |
| JPH06172009A (en) | Wood cement board | |
| JP2943844B2 (en) | Wood cement board | |
| JP3549790B2 (en) | Inorganic plate and method for producing the same | |
| JP4119086B2 (en) | Manufacturing method of wood cement board | |
| JP3136232B2 (en) | Wood cement board | |
| JP2000128663A (en) | Wood cement board manufacturing method | |
| JP2006069807A (en) | Inorganic board and its manufacturing method | |
| JP3980182B2 (en) | Manufacturing method of wood cement board | |
| KR960012720B1 (en) | Composition of lightweight concrete | |
| JP2006069806A (en) | Inorganic board and its manufacturing method | |
| JP3980181B2 (en) | High specific gravity wood cement board and manufacturing method thereof | |
| JP2000044302A (en) | High density ligneous cement plate, high density multilayer cement plate, and their production | |
| JP3037683B1 (en) | Wood cement board and method for producing the same | |
| JPS6055457B2 (en) | Manufacturing method for gypsum-based building materials with excellent water repellency | |
| JPH06271345A (en) | Wood cement board | |
| JPH075341B2 (en) | Cement-based cured product manufacturing method | |
| JP2004203711A (en) | Woody cement plate, and production method therefor | |
| JP2001342083A (en) | Wood cement board manufacturing method | |
| JPS6317038A (en) | Composite heat-insulating board material for building | |
| JP2000185983A (en) | Inorganic board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980127 |
|
| LAPS | Cancellation because of no payment of annual fees |