JPH0891912A - Cemented wood board and its production - Google Patents

Cemented wood board and its production

Info

Publication number
JPH0891912A
JPH0891912A JP25936494A JP25936494A JPH0891912A JP H0891912 A JPH0891912 A JP H0891912A JP 25936494 A JP25936494 A JP 25936494A JP 25936494 A JP25936494 A JP 25936494A JP H0891912 A JPH0891912 A JP H0891912A
Authority
JP
Japan
Prior art keywords
wood
cement board
mesh
wood cement
weight
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
Application number
JP25936494A
Other languages
Japanese (ja)
Other versions
JP3023057B2 (en
Inventor
Hidenori Kawai
秀憲 河合
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nichiha Corp
Original Assignee
Nichiha Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Nichiha Corp filed Critical Nichiha Corp
Priority to JP25936494A priority Critical patent/JP3023057B2/en
Publication of JPH0891912A publication Critical patent/JPH0891912A/en
Application granted granted Critical
Publication of JP3023057B2 publication Critical patent/JP3023057B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
    • 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
    • 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

Abstract

PURPOSE: To produce a cemented wood board having excellent appearance by incorporating a prescribed amount of powder of waste cemented wood board having a prescribed particle diameter. CONSTITUTION: This cemented wood board having few voids and gaps and excellent appearance is produced by preparing a raw material mixture composed of about 30-60wt.% of a cement such as Portland cement, about 15-30wt.% of a reinforcing wood material having a width of about 0.5-20mm, a length of about 1-20mm and an aspect ratio of 20-30 such as wood chips and 10-50wt.% of powder of waste cemented wood board having particle diameter of <=16 mesh and containing 20-60wt.% of the fraction of >=55 mesh and 40-80wt.% of the fraction of <=55 mesh, adding water to the mixture in an amount to get a slurry having a water-content of 30-45wt.%, kneading the obtained mixture, dehydrating the slurry on a net to form a sheet and curing under pressure. In the case of a board having a three-layer structure, the surface layer part having a fine structure is formed by using a fine reinforcing wood material having a mesh opening of about <=4.5mm and a core layer having a coarse structure is formed by using a coarse reinforcing wood material having a mesh opening of about 4.5-10mm.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は木質セメント板廃材粉末
を混合した木質セメント板およびその製造方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood cement board mixed with wood cement board waste powder and a method for producing the same.

【０００２】[0002]

【発明の背景】木質セメント板を製造する際、切削工程
において切屑や端切れ等の廃材が製品の１０〜２５％程
度発生するが、このような木質セメント板廃材は従来は
主として廃棄処分にしていた。しかし公害規制が厳しく
その上廃棄処分場の確保が困難となって廃棄処分費用が
嵩んでいる現状からみて、該木質セメント板廃材の再利
用が強く望まれている。上記木質セメント板廃材の再利
用方法としては、該木質セメント板廃材の粉砕物を木質
セメント板原料に混合して木質セメント板を製造する方
法が検討されている。しかしながら木質セメント板廃材
は木質補強材とセメント硬化物とからなり、多量の混合
は製品の強度低下を招くと云う問題点があった。BACKGROUND OF THE INVENTION When manufacturing a wood cement board, waste materials such as chips and scraps are generated in the cutting process in an amount of about 10 to 25% of the product. Such wood cement board waste materials are conventionally mainly discarded. . However, in view of the current situation that the pollution control is strict and the disposal site is difficult to secure and the disposal cost is high, it is strongly desired to reuse the wood cement board waste material. As a method for reusing the wood cement board waste material, a method of manufacturing a wood cement board by mixing a pulverized product of the wood cement board waste material with a wood cement board raw material has been studied. However, the wood cement board waste material is composed of a wood reinforcing material and a cement hardened material, and there is a problem that a large amount of mixing causes a decrease in strength of the product.

【０００３】[0003]

【従来の技術】従来、木質セメント板廃材粉砕物を木質
セメント板原料に混合することによる製品の強度低下を
防ぐために、該木質セメント板原料に木質セメント板廃
材粉砕物と共に石膏を添加する方法（特公昭５５−１４
８２６号）が提供されている。上記方法においてはポル
トランドセメントと木片との混合物に更に６メッシュ以
下に粉砕した木質セメント板廃材粉砕物と二水石膏とが
添加され、該木質セメント板廃材粉砕物は前記原料中の
全固形分に対して３０重量％以内になるように調整され
る。2. Description of the Related Art Conventionally, a method of adding gypsum to a wood cement board raw material together with the wood cement board waste material ground material in order to prevent the strength of the product from being lowered by mixing the wood cement board waste material with the wood cement board raw material ( Japanese Patent Publication 55-14
No. 826) is provided. In the above method, a mixture of Portland cement and wood chips is further added with a pulverized wood cement board waste material pulverized to 6 mesh or less and dihydrate gypsum, and the pulverized wood cement board waste material is added to the total solid content in the raw material. On the other hand, it is adjusted to be within 30% by weight.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら上記従来
方法にあっては、石膏を調達するかあるいは製造する必
要があり、石膏を調達する場合には製品のコストアップ
になり、また石膏を製造する場合には製造装置が必要で
更に製造の手間がかゝる。またこのようにして石膏を添
加しても製品の強度低下をきたさないためには木質セメ
ント板廃材粉砕物の添加量を３０重量％以内に制限しな
ければならない。However, in the above conventional method, it is necessary to procure or manufacture gypsum, and when procuring gypsum, the cost of the product increases, and when gypsum is manufactured. Manufacturing equipment is required, and it takes more labor to manufacture. Further, in order to prevent the strength of the product from being deteriorated even if gypsum is added in this manner, the amount of the pulverized wood cement board waste material must be limited to within 30% by weight.

【０００５】[0005]

【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、木質補強材がセメント硬
化物のマトリクス内に分散している木質セメント板であ
って、木質セメント板には木質セメント板廃材粉末が１
０〜５０重量％含まれており、該木質セメント板廃材粉
末は１６メッシュ以下の粒径である木質セメント板を提
供するものであり、該木質セメント板廃材粉末は５５メ
ッシュ以上の粒径のものを２０〜６０重量％、５５メッ
シュ以下の粒径のものを４０〜８０重量％の割合で含ん
でいる木質セメント板を提供するものである。上記木質
セメント板は例えば木質補強材を混合したセメントに木
質セメント板廃材粉末を１０〜５０重量％混合し、更に
該混合物の水分含有量を３０〜４５重量％に調節した上
で型枠上に散布してマットをフォーミングし、該マット
を圧締硬化せしめる方法によって製造される。本発明を
以下に詳細に説明する。Means for Solving the Problems As a means for solving the above-mentioned conventional problems, the present invention provides a wood cement board in which a wood reinforcing material is dispersed in a matrix of a hardened cement material. Is 1 wood cement board waste powder
0 to 50% by weight, the wood cement board waste material powder provides a wood cement board having a particle size of 16 mesh or less, the wood cement board waste material powder having a particle size of 55 mesh or more The present invention provides a wood cement board containing 20 to 60% by weight and 40 to 80% by weight of particles having a particle size of 55 mesh or less. The above-mentioned wood cement board is, for example, 10 to 50% by weight of wood cement board waste material powder is mixed with cement mixed with a wood reinforcing material, and the water content of the mixture is adjusted to 30 to 45% by weight, and then the mixture is placed on the mold. It is manufactured by a method of spraying, forming a mat, and compressing and hardening the mat. The present invention is described in detail below.

【０００６】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 for conventional wood cement boards. 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.

【０００７】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.

【０００８】本発明において用いられる木質セメント板
廃材粉末とは、木質セメント板を製造する際、切削工程
において発生する切屑や端切れ等の廃材を粉砕すること
によって得られるものである。該木質セメント板廃材の
粉砕には通常ハンマーミルが使用される。上記木質セメ
ント板廃材粉末の粒径は１６メッシュ以下とされ、更に
粒径が５５メッシュ以上のものを２０〜６０重量％、５
５メッシュ以下の粒径のものを４０〜８０重量％の割合
で含んでいるような粒度分布を有するものが望ましい。The wood cement board waste material powder used in the present invention is obtained by crushing waste materials such as chips and scraps generated in a cutting step when manufacturing a wood cement board. A hammer mill is usually used to grind the wood cement board waste material. The particle size of the wood cement board waste material powder is 16 mesh or less, and the particle size of 55 mesh or more is 20 to 60% by weight and 5
It is desirable to have a particle size distribution such that particles having a particle size of 5 mesh or less are contained in a ratio of 40 to 80% by weight.

【０００９】上記原料の他に更にセメントの一部をケイ
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で置換し
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やワックス、パラフィン、シリコ
ン等の撥水剤等を添加してもよい。In addition to the above raw materials, a part of the cement may be replaced with a filler such as silica sand, silica stone powder, silica fume, shirasu balloon, perlite, bentonite, diatomaceous earth, or calcium chloride, magnesium chloride. A cement hardening accelerator such as aluminum sulfate, sodium aluminate, or water glass, or a water repellent such as wax, paraffin, or silicon may be added.

【００１０】本発明の木質セメント板は芯層部の表裏面
に表層部を積層した三層構造とすることが望ましい。こ
のような三層構造の木質セメント板の場合、表層部およ
び芯層部ともに原料混合物Ａの組成は通常セメント３０
〜６０重量％、木質補強材１５〜３０重量％、木質セメ
ント板廃材粉末１０〜５０重量％である。しかしなが
ら、上記三層構造の木質セメント板にあっては、表層部
には緻密構造を与えるために木質補強材として目開き
４．５mm以下の粒径の微細木質補強材を使用し、芯層部
には粗構造を与えるために木質補強材として目開き４．
５〜１０mmの粒径の粗大木質補強材を使用する。The wood cement board of the present invention preferably has a three-layer structure in which surface layers are laminated on the front and back surfaces of the core layer. In the case of such a three-layered wood cement board, the composition of the raw material mixture A is usually 30% for both the surface layer portion and the core layer portion.
˜60 wt%, wood reinforcing material 15˜30 wt%, wood cement board waste material powder 10˜50 wt%. However, in the above three-layer wood cement board, a fine wood reinforcing material having a grain size of 4.5 mm or less is used as a wood reinforcing material to give a dense structure to the surface layer, and the core layer portion 3. Opening as a wood reinforcing material to give a rough structure to 4.
Use a coarse wood reinforcement with a particle size of 5-10 mm.

【００１１】本発明の木質セメント板を製造するには、
上記原料混合物に水を添加して混練したスラリーをネッ
ト上に抄造脱水してシートとし、該シートを加圧硬化さ
せ更に所望ならばオートクレーブ養生する湿式法も適用
されるが、主として上記原料混合物に３０〜４５重量％
程度の水を添加混合して加水混合物とし、上記混合物を
型板上に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。三層構造を有する木質セメント板を上記湿式法で製
造する場合には、上記原料混合物Ａで表層部となるシー
トＡを抄造し、更に上記原料混合物Ｂで芯層部となるシ
ートＢを抄造し、シートＡをシートＢの表側および／ま
たは裏側に積層し、該積層シートを加圧硬化させ、更に
所望ならばオートクレーブ養生する。また三層構造を有
する木質セメント板を半乾式法で製造する場合には上記
原料混合物Ａを加水して型板上に散布してマットＡ’を
フォーミングし、その上に上記原料混合物Ｂを加水して
該マットＡ’上に散布してマットＢ’をフォーミング
し、更に原料混合物Ａを加水して該マットＢ’上に散布
してマットＡ’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。上
記原料混合物を型板上に散布する工程を連続的に行なう
には、型板を多数個整列させて前方へ搬送しつゝその上
から原料混合物を散布する。この際前方から散布される
原料混合物に風を吹付けると原料混合物中の木質補強材
が風選され、下部には微細な木質補強材が堆積し、上部
には粗大な木質補強材が堆積したマットが得られる。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においては、表層部の厚みと芯
層部の厚みの比率は通常３：７程度とされる。To produce the wood cement board of the present invention,
A wet method in which water is added to the above-mentioned raw material mixture and kneaded to form a sheet on the net by papermaking and dehydration, and the sheet is pressure-cured and further cured by autoclave if desired, is mainly applied to the raw material mixture. 30-45% by weight
A semi-drying method in which about 5 parts of water is added and mixed to form a water-mixed mixture, the above-mentioned mixture is sprayed on a template to form a mat, and the mat thus formed is pressure-hardened, and if desired, autoclave-cured. The law applies. When a wood cement board having a three-layer structure is produced by the above-mentioned wet method, the raw material mixture A is used to make a sheet A which is a surface layer portion, and the raw material mixture B is made to be a sheet B which is a core layer portion. The sheet A is laminated on the front side and / or the back side of the sheet B, the laminated sheet is pressure-cured, and further, if desired, autoclaved. When a wood cement board having a three-layer structure is manufactured by the semi-dry method, the above-mentioned raw material mixture A is watered and sprinkled on a template to form a mat A ', and the above-mentioned raw material mixture B is added thereto. Then, the mixture is sprayed on the mat A'to form a mat B ', and the raw material mixture A is further hydrolyzed and sprayed on the mat B'to form a mat A'. A semi-dry method is applied in which the mat is pressure-hardened and, if desired, autoclaved. In order to continuously perform the step of spraying the raw material mixture on the template, a plurality of template plates are aligned and conveyed forward, and the raw material mixture is sprayed on the template. At this time, when air was blown to the raw material mixture sprayed from the front, the wood reinforcing material in the raw material mixture was selected, fine wood reinforcing material was deposited on the lower part, and coarse wood reinforcing material was deposited on the upper part. A mat is obtained. In this way, the wood cement board of the present invention is manufactured,
In the wood cement board of the present invention, the ratio of the thickness of the surface layer portion to the thickness of the core layer portion is usually about 3: 7.

【００１２】[0012]

【作用】従来は前記したように６メッシュ以下の粗大粒
径を有する木質セメント板廃材粉砕物が木質セメント板
原料中に添加されていた。このような粗大粒径の木質セ
メント板廃材粉砕物を添加すれば製品の強度が低下する
ことは前記した通りである。 本発明では木質セメント
板廃材を１６メッシュ以下の微細粒径にまで粉砕する
と、該木質セメント板廃材粉末は製品の強度を低下せし
めることなく、かえって補強材としての役目を果たすこ
とが判明した。したがって従来に比して木質セメント板
廃材粉末の添加量を５０重量％にまで増加することが出
来、木質セメント板廃材の利用効率が高められる。更に
該木質セメント板廃材粉末として５５メッシュ以上の粒
径のものを２０〜６０重量％、５５メッシュ以下の粒径
のものを４０〜８０重量％の割合で含んでいるものを使
用すると、５５メッシュ以上の粒径のものは補強材とし
ての役目を果たし、５５メッシュ以下の粒径のものは木
質セメント板のセメントマトリクスに形成される細孔に
充填して寸法安定性や耐凍結融解性を向上せしめ、更に
製品の表面の巣穴や小口の空隙がなくなり、表面や小口
に平滑感が与えられ、かつ表面にエンボスを施した場合
にはシャープなエンボスが得られる。しかしながら木質
セメント板廃材粉末の添加量が５０重量％を越えると製
品の強度が若干低下する。In the past, as described above, a crushed wood cement board waste material having a coarse particle size of 6 mesh or less was added to the raw material of the wood cement board. As described above, the strength of the product is reduced by adding such a crushed material of wood cement board waste material having a coarse particle size. In the present invention, it was found that when the wood cement board waste material is pulverized to a fine particle size of 16 mesh or less, the wood cement board waste material powder serves as a reinforcing material without lowering the strength of the product. Therefore, the amount of the wood cement board waste powder added can be increased to 50% by weight as compared with the conventional case, and the utilization efficiency of the wood cement board waste material is enhanced. Further, when the wood cement board waste powder containing 20 to 60% by weight of particles having a particle size of 55 mesh or more and 40 to 80% by weight of particles having a particle size of 55 mesh or less is used, 55 mesh is obtained. Particles with the above particle size serve as a reinforcing material, and particles with a particle size of 55 mesh or less are filled in the pores formed in the cement matrix of the wood cement board to improve dimensional stability and freeze-thaw resistance. In addition, cavities on the surface of the product and pores on the edge are eliminated, giving a smooth feeling to the surface and the edge, and when the surface is embossed, sharp embossing is obtained. However, when the amount of the waste wood cement board powder added exceeds 50% by weight, the strength of the product is slightly lowered.

【００１３】[0013]

【実施例】表１に示す組成の混合物に水を４０〜５０重
量％添加した加水混合物を用いて、表裏層部と芯層部と
を有する三層構造の木質セメント板である本発明の試料
１，２，３および比較試料１，２を作成した。製造条件
は圧締プレス圧２１〜３０Kgf／cm2 、硬化条件は温度
４０〜６０℃，時間１８〜２４時間、自然養生は約１週
間、乾燥条件は温度６５〜８５℃で１０〜１５時間であ
る。木質セメント板廃材粉末としては、木質セメント板
を製造する際の切削工程において発生する切屑や端切れ
等の廃材をハンマーミルによって粉砕したものを使用し
た。上記木質セメント板廃材粉末は１６メッシュ以下の
粒径を有し、５５メッシュ以上の粒径のものが約４０重
量％、５５メッシュ以下の粒径のものが約６０重量％の
割合で含まれていた。EXAMPLE A sample of the present invention, which is a wood cement board having a three-layer structure having front and back layers and a core layer, using a water-mixture containing 40 to 50% by weight of water added to the mixture having the composition shown in Table 1. 1, 2, 3 and comparative samples 1, 2 were prepared. Manufacturing conditions are compression pressing pressure of 21 to 30 Kgf / cm 2 , curing conditions of temperature 40 to 60 ° C., time of 18 to 24 hours, natural curing for about 1 week, and drying conditions of temperature of 65 to 85 ° C. for 10 to 15 hours. is there. As the wood cement board waste material powder, a waste material such as chips and scraps generated in a cutting process in manufacturing the wood cement board was crushed by a hammer mill. The above-mentioned wood cement board waste powder has a particle size of 16 mesh or less, and a particle size of 55 mesh or more is contained in about 40% by weight, and a particle size of 55 mesh or less is contained in about 60% by weight. It was

【００１４】試料および比較試料は、下型板上に表１に
示す表層部組成の混合物を所定量散布して表層部マット
をフォーミングし、その上に表１に示す芯層部組成の混
合物を所定量散布して芯層部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、表１に示す条件で圧締、硬化、養生および乾燥す
ることにより三層構造で表裏層／芯層比３／７の木質セ
メント板とした。このようにして得られた各試料の各種
物性を測定した。その結果は表２に示される。なお上記
各試験方法は次のようである。 曲げ強度試験：ＪＩＳＡ−５４１７号，３号試験片につ
いて行なった。 吸水率：ＪＩＳＡ−５４１７にもとづいて行なった。 密度、厚さ：ＪＩＳＡ−５４１７にもとづいて行なっ
た。 タッピンネジ逆引抜抵抗：１０×１０cmのテストピース
を用いて頭径８φ（軸径４φ）のタッピンネジを２mm／
min のスピードで逆引抜きした。 耐衝撃性：ＪＩＳＡ−１４２１にもとづいて行なった。 切断性：全試料につき切断時の感触。 外観：９１０×１８２０mmのバレット毎について外観検
査した。The samples and comparative samples were sprayed with a predetermined amount of the mixture of the surface layer composition shown in Table 1 on the lower template to form a surface layer mat, and the mixture of the core layer composition shown in Table 1 was formed thereon. Spread a predetermined amount to form the core layer mat,
Further, a predetermined amount of the above-mentioned composition of the surface layer portion is sprinkled on the back surface layer to form a back layer mat, and an upper template is brought into contact with the back surface mat. A wood cement board having a three-layer structure and a front / back layer / core layer ratio of 3/7 was used. Various physical properties of each sample thus obtained were measured. The results are shown in Table 2. The above test methods are as follows. Bending strength test: Tested on JIS A-5417 and No. 3 test pieces. Water absorption rate: Measured according to JIS A-5417. Density, thickness: It carried out based on JISA-5417. Reverse tapping screw pull-out resistance: Use a 10 x 10 cm test piece to insert a tapping screw with a head diameter of 8φ (shaft diameter 4φ) of 2 mm /
Reverse drawing was performed at a speed of min. Impact resistance: Performed according to JIS A-1421. Cleavability: All samples feel when cut. Appearance: The appearance of each 910 × 1820 mm bullet was inspected.

【００１５】[0015]

【表１】 [Table 1]

【００１６】[0016]

【表２】 [Table 2]

【００１７】表２を参照すると、木質セメント板廃材粉
末を添加した本発明の試料は従来の比較試料１に比して
物理的諸物性は何ら遜色のなくむしろ表面の巣穴や小口
の空隙の少ない外観の良好な木質セメント板が得られ
る。しかし木質セメント板廃材粉末が５０重量％を越え
て含まれている比較試料２では破壊強度やタッピンネジ
逆引抜抵抗が劣る。Referring to Table 2, the physical properties of the sample of the present invention to which the wood cement board waste material powder is added are not inferior to those of the conventional comparative sample 1, but rather the surface burrows and the small pores are present. It is possible to obtain a wood cement board with a good appearance. However, the comparative sample 2 containing more than 50% by weight of wood cement board waste powder is inferior in breaking strength and reverse tapping screw pull-out resistance.

【００１８】[0018]

【発明の効果】したがって本発明においては、木質セメ
ント板廃材を有効に再利用し、物理的性質を劣化させる
ことなく、表面の巣穴や小口の空隙の少ない外観の良好
な木質セメント板を製造することが出来る。[Effects of the Invention] Therefore, in the present invention, the wood cement board waste material is effectively reused to produce a wood cement board having a good appearance with few burrows and small pores on the surface without deteriorating the physical properties. You can do it.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】木質補強材がセメント硬化物のマトリクス
内に分散している木質セメント板であって、木質セメン
ト板には木質セメント板廃材粉末が１０〜５０重量％含
まれており、該木質セメント板廃材粉末は１６メッシュ
以下の粒径であることを特徴とする木質セメント板1. A wood cement board in which a wood reinforcing material is dispersed in a matrix of a hardened cement material, wherein the wood cement board contains 10 to 50% by weight of wood cement board waste material powder. Cement board waste wood powder characterized by having a particle size of 16 mesh or less 【請求項２】該木質セメント板廃材粉末は５５メッシュ
以上の粒径のものを２０〜６０重量％、５５メッシュ以
下の粒径のものを４０〜８０重量％の割合で含んでいる
請求項１に記載の木質セメント板2. The waste wood cement board powder contains 20 to 60% by weight of particles having a particle size of 55 mesh or more and 40 to 80% by weight of particles having a particle size of 55 mesh or less. Wood cement board described in 【請求項３】該木質セメント板は緻密構造を有する表裏
層と粗構造を有する芯層とからなる三層構造を有してい
る請求項１または２に記載の木質セメント板3. The wood cement board according to claim 1 or 2, wherein the wood cement board has a three-layer structure including front and back layers having a dense structure and a core layer having a rough structure. 【請求項４】木質補強材を混合したセメントに木質セメ
ント板廃材粉末を１０〜５０重量％混合し、更に該混合
物の水分含有量を３０〜４５重量％に調節した上で型枠
上に散布してマットをフォーミングし、該マットを圧締
硬化せしめることを特徴とする木質セメント板の製造方
法4. A cement mixed with a wood reinforcing material is mixed with 10 to 50% by weight of wood cement board waste material powder, the water content of the mixture is further adjusted to 30 to 45% by weight, and the mixture is sprayed onto a mold. And then forming the mat, and compressing and hardening the mat, and a method for producing a wood cement board.
JP25936494A 1994-09-28 1994-09-28 Wood cement board and method for producing the same Expired - Fee Related JP3023057B2 (en)

Priority Applications (1)

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JP25936494A JP3023057B2 (en) 1994-09-28 1994-09-28 Wood cement board and method for producing the same

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Application Number Priority Date Filing Date Title
JP25936494A JP3023057B2 (en) 1994-09-28 1994-09-28 Wood cement board and method for producing the same

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JPH0891912A true JPH0891912A (en) 1996-04-09
JP3023057B2 JP3023057B2 (en) 2000-03-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6740423B2 (en) 2000-01-31 2004-05-25 Nichiha Corporation Colored building boards, manufacturing methods thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03218955A (en) * 1990-01-23 1991-09-26 Nichiha Kk Inorganic formed board and its production
JPH05208854A (en) * 1991-01-14 1993-08-20 Sekisui Chem Co Ltd Production of hard cement chip board
JPH06293548A (en) * 1993-04-08 1994-10-21 Daiken Trade & Ind Co Ltd Cement board containing wooden chip

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03218955A (en) * 1990-01-23 1991-09-26 Nichiha Kk Inorganic formed board and its production
JPH05208854A (en) * 1991-01-14 1993-08-20 Sekisui Chem Co Ltd Production of hard cement chip board
JPH06293548A (en) * 1993-04-08 1994-10-21 Daiken Trade & Ind Co Ltd Cement board containing wooden chip

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6740423B2 (en) 2000-01-31 2004-05-25 Nichiha Corporation Colored building boards, manufacturing methods thereof

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Publication number Publication date
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