JP2001294473A - Woody cement board and its production process - Google Patents
Woody cement board and its production processInfo
- Publication number
- JP2001294473A JP2001294473A JP2000106366A JP2000106366A JP2001294473A JP 2001294473 A JP2001294473 A JP 2001294473A JP 2000106366 A JP2000106366 A JP 2000106366A JP 2000106366 A JP2000106366 A JP 2000106366A JP 2001294473 A JP2001294473 A JP 2001294473A
- Authority
- JP
- Japan
- Prior art keywords
- wood
- thermoplastic organic
- raw material
- fiber
- 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
-
- 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
- Producing Shaped Articles From Materials (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は例えば屋根の下地材であ
る野地板や外装材等に使用される木質セメント板に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood cement board used as a base material for a roof, a base plate for a roof, an exterior material, and the like.
【０００２】[0002]
【発明の背景】この種の木質セメント板は、木片とセメ
ントとを主体とする原料混合物を板状に成形硬化した所
謂木片セメント板と言われるものであり、防火性、木材
加工性を備えた板である。しかし該木質セメント板は粗
大形状の木片によってのみ補強されているので、野地板
等に使用する場合に釘を打ち込むと、打込み個所によっ
ては、裏面層に厚めの木片が存在し、釘がその木片にあ
たっても貫通出来ずに裏面を押し、釘のまわりの部分が
欠落してしまういわゆる花咲き現象が発生する。このよ
うな花咲き現象が発生すると板の釘保持力が低下する。BACKGROUND OF THE INVENTION This type of wood cement board is a so-called wood chip cement board obtained by forming and hardening a raw material mixture mainly composed of wood chips and cement into a plate shape, and has fire resistance and wood workability. It is a board. However, since the wood cement board is reinforced only by a coarse wood piece, when a nail is driven into a field board or the like, a thick wood piece is present on the back layer depending on the place where the wood is driven. In this case, a so-called flowering phenomenon occurs in which the back surface is pushed without being able to penetrate, and a portion around the nail is missing. When such a flowering phenomenon occurs, the nail holding force of the plate decreases.
【０００３】[0003]
【従来の技術】このような木質セメント板の釘打ち性を
改良する手段として、従来木片セメント板に更にドライ
パルプや合成繊維を添加することが提案されている（特
開平９−８７００２号）。2. Description of the Related Art As means for improving the nailability of such a wood cement board, it has been proposed to add dry pulp or synthetic fiber to a wood chip cement board (Japanese Patent Laid-Open No. 9-87002).
【０００４】[0004]
【発明が解決しようとする課題】木片セメント板は木片
とセメントとを主体とする原料混合物に水を添加して基
板上に撒布することによってマットをフォーミングし、
該マットを圧締養生硬化せしめる半乾式法によって製造
されるが、この場合ドライパルプや合成繊維を多量に添
加すると繊維相互が絡み合ってダマが出来、そのために
充分な補強効果が得られない。したがって木片セメント
板を半乾式法によって製造する場合には多量のドライパ
ルプや合成繊維を添加することが出来ず（通常０．１〜
２．０重量％程度）、釘打ち性の改良効果は充分とは言
えなかった。The wood chip cement board forms a mat by adding water to a raw material mixture mainly composed of wood chips and cement and spraying the mixture on a substrate.
The mat is produced by a semi-dry method in which the mat is hardened by pressing. In this case, if a large amount of dry pulp or synthetic fiber is added, the fibers are entangled with each other to form lumps, so that a sufficient reinforcing effect cannot be obtained. Therefore, when a wood chip cement board is manufactured by a semi-dry method, a large amount of dry pulp or synthetic fiber cannot be added (usually 0.1 to 0.1).
2.0% by weight), and the effect of improving nailing properties was not sufficient.
【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、木片ＦＬまたは木質繊
維ＦＬ’とセメント系無機材料とを含有する原料混合物
の硬化物である木質セメント板であって、内部には熱可
塑性有機繊維ＯＦの綿状塊中に該原料混合物が包含され
ている集合体Ｃに由来する該熱可塑性有機繊維網が全体
的に広がっており、表層および／または裏層部分では該
熱可塑性有機繊維ＯＦは相互融着している木質セメント
板を提供するものである。また該熱可塑性有機繊維ＯＦ
は該木質セメント板中に１．０〜８．０重量％含有され
ていることが望ましい。According to the present invention, as a means for solving the above-mentioned conventional problems, wood cement, which is a hardened product of a raw material mixture containing wood chips FL or wood fiber FL 'and a cement-based inorganic material, is used. A plate, in which the thermoplastic organic fiber network derived from the aggregate C in which the raw material mixture is contained in the cotton-like mass of the thermoplastic organic fibers OF is entirely spread, and the surface layer and / or Alternatively, in the backing layer, the thermoplastic organic fibers OF provide a mutually cemented wood cement board. The thermoplastic organic fiber OF
Is preferably contained in the wood cement board in an amount of 1.0 to 8.0% by weight.
【０００６】更に本発明では熱可塑性有機繊維ＯＦと木
片ＦＬとを高速回転攪拌によって混合することによって
該熱可塑性有機繊維ＯＦを木片ＦＬに絡ませつゝ綿状と
した上で他の木質セメント板原料および水とを添加混合
して原料混合物を調製し、該原料混合物を基板上に撒布
してマットをフォーミングし、該マットを圧締硬化養生
する木質セメント板の製造方法および熱可塑性有機繊維
ＯＦと木質繊維ＦＬ’とを高速回転攪拌によって混合す
ることによって該熱可塑性有機繊維ＯＦを木質繊維Ｆ
Ｌ’に絡ませつゝ綿状とした上で他の木質セメント板原
料と共に水に分散させて原料スラリーを調製し、該原料
スラリーを抄造してマットをフォーミングし、該マット
を圧締硬化養生する製造方法を提供するものである。Further, in the present invention, the thermoplastic organic fiber OF and the wood piece FL are mixed by high-speed rotation and stirring, so that the thermoplastic organic fiber OF is entangled with the wood piece FL. A raw material mixture is prepared by adding and mixing water and the raw material mixture, the raw material mixture is sprayed on a substrate, a mat is formed, the mat is pressed and cured, and a method for producing a wood cement board and a thermoplastic organic fiber OF The thermoplastic organic fiber OF is mixed with the wood fiber FL 'by high-speed rotation and stirring to convert the thermoplastic organic fiber OF into the wood fiber FL.
After entangled with L ', the mixture is made into cotton and dispersed in water together with other wood cement board raw materials to prepare a raw material slurry, the raw material slurry is formed, a mat is formed, and the mat is pressed and cured. It is intended to provide a manufacturing method.
【０００７】[0007]
【発明の実施の形態】以下、本発明を詳細に説明する。 〔セメント系無機粉体〕本発明に使用するセメント系無
機粉体とは、ケイ酸カルシウムを主成分とした水硬性の
無機材料であり、このような無機材料としては、例えば
ポルトランドセメント、あるいはポルトランドセメント
に高炉スラグを混合した高炉セメント、フライアッシュ
を混合したフライアッシュセメント、火山灰や白土等の
シリカ物質を混合したシリカセメント、アルミナセメン
ト、高炉スラグ等がある。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. [Cement-based inorganic powder] The cement-based inorganic powder used in the present invention is a hydraulic inorganic material containing calcium silicate as a main component. Examples of such an inorganic material include Portland cement and Portland cement. There are blast furnace cement in which blast furnace slag is mixed with cement, fly ash cement in which fly ash is mixed, silica cement in which silica material such as volcanic ash and clay is mixed, alumina cement, blast furnace slag, and the like.
【０００８】〔木片〕本発明に使用する木片としては、
特に限定されないが、単層用としては平均長さが１〜２
０mm、厚みが０．５〜３mmであるものが好ましく、２層
構造における表層または３層構造における表層用として
は平均長さ１〜１２mm、厚みが０．５〜１．５mmである
もの（細粒木片）が好ましく、２層構造における裏層用
としては平均長さが１〜１５mm、厚みが０．５〜２mmで
あるもの（中粒木片）が好ましく、３層構造における芯
層用としては平均長さが５〜２０mm、厚みが０．８〜
２．５mmであるもの（粗粒木片）が好ましい。上記のと
おり、２層構造における裏層用の木片は表層用の木片よ
りも若干粗くてもよいが、細かい方が花咲き現象が生じ
にくい。[Wood pieces] Wood pieces used in the present invention include:
Although not particularly limited, the average length is 1 to 2 for a single layer.
0 mm and a thickness of 0.5 to 3 mm are preferable, and for a surface layer in a two-layer structure or a surface layer in a three-layer structure, an average length of 1 to 12 mm and a thickness of 0.5 to 1.5 mm (thin Particles are preferable, and for the back layer in a two-layer structure, those having an average length of 1 to 15 mm and a thickness of 0.5 to 2 mm (medium particle chips) are preferable, and for the core layer in a three-layer structure, Average length 5-20mm, thickness 0.8-
Those having a size of 2.5 mm (coarse-grained wood chips) are preferred. As described above, the wood piece for the back layer in the two-layer structure may be slightly coarser than the wood piece for the surface layer, but the finer the wood piece, the less the flowering phenomenon occurs.
【０００９】〔木質繊維〕本発明の湿式法で使用する木
質繊維としては、クラフトパルプ、故紙あるいはバージ
ンパルプ等の木質繊維が望ましい。[Wood Fiber] As the wood fiber used in the wet method of the present invention, wood fiber such as kraft pulp, waste paper or virgin pulp is desirable.
【００１０】〔熱可塑性有機繊維〕本発明に使用する熱
可塑性有機繊維とは、ポリアミド繊維、ポリエステル繊
維、ポリエチレン繊維、ポリプロピレン繊維等の熱可塑
性樹脂の繊維であるが、上記熱可塑性繊維に加えてポリ
ビニルアルコ−ル繊維（ビニロン）、ポリ塩化ビニル、
ポリ塩化ビニリデン等のポリ塩化ビニル系繊維、ポリウ
レタン繊維、ポリオキシメチレン繊維、ポリテトラフル
オロエチレン繊維、ベンゾエ−ト繊維、ポリイミド繊維
等の合成繊維等である。上記繊維は不織布、編織物、フ
ェルト等の繊維シートのスクラップを解繊した再生繊維
であってもよい。また上記繊維は望ましくは径０．１mm
以下の単繊維である。[Thermoplastic Organic Fiber] The thermoplastic organic fiber used in the present invention is a fiber of a thermoplastic resin such as polyamide fiber, polyester fiber, polyethylene fiber and polypropylene fiber. Polyvinyl alcohol fiber (vinylon), polyvinyl chloride,
Examples thereof include synthetic fibers such as polyvinyl chloride fibers such as polyvinylidene chloride, polyurethane fibers, polyoxymethylene fibers, polytetrafluoroethylene fibers, benzoate fibers, and polyimide fibers. The fibers may be regenerated fibers obtained by defibrating scraps of a fiber sheet such as a nonwoven fabric, a knitted fabric, and a felt. The fibers are preferably 0.1 mm in diameter.
These are the following single fibers.
【００１１】〔その他の成分〕本発明の木質セメント板
には、上記セメント系無機材料及び熱可塑性有機繊維以
外の成分として、塩化マグネシウム、硫酸マグネシウ
ム、塩化カルシウム、硫酸カルシウム、アルミン酸ナト
リウム、アルミン酸カリウム、硫酸アルミニウム、水ガ
ラス等の硬化促進剤、バーミキュライト、ベントナイト
等の鉱物粉末、木片セメント板、木質繊維セメント板の
ような木質セメント板の廃材の粉砕物（リジェクト）、
ワックス、パラフィン、シリコン等の防水剤、合成樹脂
エマルジョン等の補給材、発泡性熱可塑性プラスチック
ビ−ズ、プラスチック発泡体等が添加されてもよい。上
記例示は本発明を限定するものではない。[Other components] The wood cement board of the present invention contains magnesium chloride, magnesium sulfate, calcium chloride, calcium sulfate, sodium aluminate and aluminate as components other than the above-mentioned cement-based inorganic material and thermoplastic organic fibers. Hardening accelerators such as potassium, aluminum sulfate, water glass, etc., mineral powders such as vermiculite, bentonite, etc., pulverized material (reject) of wood cement board waste such as wood chip cement board, wood fiber cement board,
Waterproofing agents such as wax, paraffin and silicone, replenishing materials such as synthetic resin emulsions, foamable thermoplastic beads, plastic foams and the like may be added. The above examples do not limit the invention.
【００１２】〔木質セメント板の組成〕本発明の木質セ
メント板の原料混合物において、上記セメント系無機材
料は５５〜９０重量％であるのが好ましく、上記木片は
１０〜４５重量％であるのが好ましく、上記熱可塑性有
機繊維が合成繊維の場合には１．０〜５．０重量％、望
ましくは１．５〜２．５重量％、木質繊維の場合には３
〜２０重量％、望ましくは５〜１０重量％とする。上記
原料混合物中、木片の混合物比が１０重量％未満では該
木片による補強効果は十分でなくなり、木片の混合比が
４５重量％を超えると、相対的にセメント系無機材料の
量が少なくなるため、該セメント系無機材料の固結が阻
害され、かえって強度が低下する傾向にある。また熱可
塑性有機繊維の添加量が上記範囲を下回ると釘打ち性の
改良効果が顕著でなくなり、更に上記範囲を超えると繊
維相互が絡み易くなる。[Composition of the Wood Cement Board] In the raw material mixture for the wood cement board of the present invention, the content of the cement-based inorganic material is preferably 55 to 90% by weight, and the weight of the wood chips is 10 to 45% by weight. Preferably, when the thermoplastic organic fiber is a synthetic fiber, it is 1.0 to 5.0% by weight, preferably 1.5 to 2.5% by weight.
-20% by weight, preferably 5-10% by weight. When the mixture ratio of the wood chips in the raw material mixture is less than 10% by weight, the reinforcing effect of the wood chips is not sufficient, and when the mixing ratio of the wood chips exceeds 45% by weight, the amount of the cement-based inorganic material is relatively small. The solidification of the cement-based inorganic material is hindered, and the strength tends to decrease. If the amount of the thermoplastic organic fiber is less than the above range, the effect of improving the nailing property is not remarkable, and if it exceeds the above range, the fibers tend to be entangled with each other.
【００１３】〔木質セメント板の製造〕本発明の木質セ
メント板は、半乾式法あるいは湿式抄造法によって製造
するのが好ましく、特にこれらの方法によって製造した
木質セメント板において、花咲き現象の防止又は抑制と
いう効果が顕著にあらわれる。[Manufacture of Wood Cement Board] The wood cement board of the present invention is preferably manufactured by a semi-dry method or a wet paper-making method. The effect of suppression appears remarkably.
【００１４】半乾式法の場合にはまず上記熱可塑性有機
繊維と上記木片とを例えば回転式ミキサーのような強制
攪拌型ミキサーを使用して高速回転攪拌する。そうする
と上記熱可塑性有機繊維が木片に絡みつきながら綿状に
なる。In the case of the semi-dry method, first, the thermoplastic organic fiber and the wood piece are rotationally stirred at a high speed using a forced stirring type mixer such as a rotary mixer. Then, the thermoplastic organic fibers become flocculent while being entangled with the wood pieces.
【００１５】上記のようにして熱可塑性有機繊維を木片
に絡ませ綿状にした後、セメント系無機材料、鉱物粉
末、リジェクト等の粉体原料を添加混合し、次いで防水
剤、硬化促進剤、水を添加混合して原料混合物を調製す
る。水の添加量は該原料混合物中の水分含有率が通常１
５〜５０重量％になるようにするが、補強材が木質繊維
の場合には熱可塑性有機繊維と木質繊維とを強制攪拌型
ミキサー等で高速回転攪拌して熱可塑性有機繊維を木質
繊維に絡ませた後、粉体原料を添加混合する時点であら
かじめ少量の水を添加することが望ましい。[0015] After the thermoplastic organic fiber is entangled with a piece of wood to form a cotton as described above, powder materials such as a cement-based inorganic material, mineral powder, and reject are added and mixed, and then a waterproofing agent, a curing accelerator, water Is added and mixed to prepare a raw material mixture. The amount of water added is such that the water content in the raw material mixture is usually 1
When the reinforcing material is wood fiber, the thermoplastic organic fiber and the wood fiber are rotated and stirred at high speed by a forced stirring mixer or the like so that the thermoplastic organic fiber is entangled with the wood fiber. It is desirable to add a small amount of water in advance at the time of adding and mixing the powder raw material.
【００１６】上記原料調製過程を図１(1),(2),(3),(4)
に示す。(1) において木片ＦＬと熱可塑性有機繊維ＯＦ
とを高速回転攪拌すると、(2) に示すように木片ＦＬに
熱可塑性有機繊維ＯＦが絡みついてくる。更に高速回転
攪拌すると、(3) に示すように該熱可塑性有機繊維ＯＦ
が絡みついている木片相互の集塊化が起り始め、該集塊
には空気が含まれて綿菓子状に膨れる。こゝでセメント
等の粉体原料Ｐを添加し更に高速回転攪拌すると、最終
的には(4) に示すように表面にセメント等の粉体原料Ｐ
が付着した木片ＦＬが綿菓子状の熱可塑性有機繊維即ち
熱可塑性有機繊維の綿状塊中に散在包含されている集合
体Ｃが生成する。このような集合体Ｃを含む原料混合物
は型板、搬送板等の基板Ｂ上に撒布され図２に示すよう
なマットＭがフォーミングされる。FIG. 1 (1), (2), (3), (4)
Shown in (1) Wood chips FL and thermoplastic organic fiber OF
When these are stirred at high speed, the thermoplastic organic fibers OF become entangled with the wood piece FL as shown in (2). When the mixture is further stirred at a high speed, the thermoplastic organic fibers OF are mixed as shown in (3).
Agglomeration of the pieces of wood entangled with each other begins to occur, and the agglomerates contain air and swell like cotton candy. Here, the powder raw material P such as cement is added and further stirred at high speed, and finally the powder raw material P such as cement is formed on the surface as shown in (4).
The aggregate C is formed in which the wood pieces FL to which are adhered are scattered and contained in the cotton organic candy-like thermoplastic organic fibers, that is, the cotton-like masses of the thermoplastic organic fibers. The raw material mixture containing such an aggregate C is spread on a substrate B such as a template or a transport plate, and a mat M as shown in FIG. 2 is formed.
【００１７】以上のようにして集合体Ｃを含むマットＭ
がフォーミングされたら、該マットＭを基板とともに圧
締して加熱状態下で一次硬化せしめる。該一次硬化にお
いて適用される温度は通常５０〜１００℃であり、圧締
圧は通常２〜５MPa である。上記一次硬化後、得られた
一次硬化体は脱型した上で常温養生又はオートクレーブ
養生する。常温養生は、通常常温で２〜５日間行われ、
オートクレーブ養生は、通常８５％ＲＨ以上の湿度、１
３０〜１８０℃の温度で４〜１８時間行われる。常温養
生又はオートクレーブ養生後は、乾燥工程を経て表面処
理を行い木質セメント板とする。The mat M containing the aggregate C as described above
Is formed, the mat M is pressed together with the substrate and primary cured under a heated condition. The temperature applied in the primary curing is usually 50 to 100 ° C., and the pressing pressure is usually 2 to 5 MPa. After the primary curing, the obtained primary cured product is removed from the mold and cured at room temperature or in an autoclave. Room temperature curing is usually performed at room temperature for 2-5 days,
Autoclave curing is usually performed at a humidity of 85% RH or more,
It is performed at a temperature of 30 to 180 ° C. for 4 to 18 hours. After curing at room temperature or after curing in an autoclave, a surface treatment is performed through a drying step to obtain a wood cement board.
【００１８】木質セメント板表面に凹凸模様を付する場
合には、該基板の型面に該凹凸模様に対応した凹凸模様
を形成しておけばよい。また表面に凹凸模様のない平滑
な木質セメント板を製造する場合には、基板として直接
搬送板を使用してもよい。When an uneven pattern is formed on the surface of the wood cement board, an uneven pattern corresponding to the uneven pattern may be formed on the mold surface of the substrate. In the case of producing a smooth wood cement board having no uneven pattern on the surface, a transport board may be directly used as a substrate.
【００１９】湿式抄造法の場合には、半乾式法と同様に
熱可塑性有機繊維を木質繊維に絡ませ綿状とした上で半
乾式法と同様な他の木質セメント板原料と共に水に分散
させて原料スラリーとする。該原料スラリーは通常固形
分濃度を１０〜２０重量％程度に調製され、濾水性のよ
い長尺の濾布上に流込み抄造して抄造層となし、該抄造
層をメイキングロールに複数層巻取り所定厚みの段階で
裁断展開した積層マットを通常平板プレスまたはロール
プレスで加圧成形して成形マットとする。該成形マット
は通常上記の条件下で圧締硬化され、その後上記の通り
２〜５日間の常温養生もしくは通常８５％ＲＨ以上の湿
度、１３０〜１８０℃の温度で４〜１８時間のオートク
レーブ養生される。In the case of the wet papermaking method, the thermoplastic organic fibers are entangled with the wood fibers to form a flocculent shape in the same manner as in the semi-dry method, and then dispersed in water together with other wood cement board raw materials similar to the semi-dry method. Raw material slurry. The raw material slurry is usually prepared to have a solid content of about 10 to 20% by weight, and is poured into a long filter cloth having good drainage to form a papermaking layer, and the papermaking layer is wound into a plurality of layers on a making roll. The laminated mat that has been cut and developed at a predetermined thickness stage is usually subjected to pressure molding by a flat plate press or a roll press to form a molded mat. The molding mat is usually press-hardened under the above-mentioned conditions, and then cured as described above at room temperature for 2 to 5 days or at a temperature of 130 to 180 ° C. and a humidity of usually 85% RH or more for 4 to 18 hours. You.
【００２０】上記半乾式法あるいは湿式抄造法によって
製造された木質セメント板は、表層および／または裏層
部分を熱可塑性有機繊維の軟化点以上の温度に加熱し
て、該表層および／または裏層部分の該熱可塑性有機繊
維を相互融着せしめ部分接着もしくは点接着させる。上
記木質セメント板の表層および／または裏層部分の加熱
は、オートクレーブ養生中や、熱プレート、熱ロールプ
レスあるいは乾燥工程での加熱室によって行われる。The wood cement board manufactured by the above-mentioned semi-dry method or wet papermaking method heats the surface layer and / or the back layer portion to a temperature higher than the softening point of the thermoplastic organic fiber, and the surface layer and / or the back layer are heated. The portions of the thermoplastic organic fibers are mutually fused and partially bonded or spot bonded. Heating of the surface layer and / or back layer portion of the wood cement board is performed during autoclave curing, or by a heating plate, a hot roll press, or a heating chamber in a drying step.
【００２１】上記製品ＰＲにあっては、図３に示すよう
に綿状の熱可塑性有機繊維ＯＦが木片ＦＬに絡みつゝ板
全体に網状に広がり、更に表裏層部分では該熱可塑性有
機繊維相互が点Ｍe で融着し部分接着もしくは点接着し
ているので、その結果板が補強されて剛性が向上し、か
つ破壊荷重がかゝったとき表面からの繊維の引き抜けが
減少して表面クラックの発生が抑制され、釘打ちの際の
花咲き現象が防止されて釘打ち性が改良される。そして
板表面に深い凹凸模様を形成するような場合にも該凹凸
模様を形成した後に熱可塑性有機繊維ＯＦを加熱融着
し、部分接着もしくは点接着させるので繊維網が破壊し
たり、表面が崩れたりするおそれがない。繊維網を板内
部とくに表面近くに挿入した後、板裏面に深い凹凸模様
を形成すると、繊維網が破壊したり表面が崩れたりす
る。繊維網を板内に形成させることは通常湿式抄造法で
は困難であるが、本発明では湿式抄造法でも板内に繊維
網のかわりに熱可塑性有機繊維の融着によるネット効果
が得られる。In the above-mentioned product PR, as shown in FIG. 3, the cotton-like thermoplastic organic fibers OF are entangled with the wood pieces FL and spread in a net-like manner over the entire board. Are fused or partially adhered at the point Me, and as a result, the plate is reinforced and the rigidity is improved, and when a breaking load is applied, pulling out of the fiber from the surface is reduced and the surface is reduced. The occurrence of cracks is suppressed, the flowering phenomenon at the time of nailing is prevented, and nailing properties are improved. Even when a deep uneven pattern is formed on the surface of the plate, the thermoplastic organic fiber OF is heat-fused after the uneven pattern is formed and partially or spot-bonded, so that the fiber net is broken or the surface is broken. There is no danger. If a deep uneven pattern is formed on the back surface of the board after the fiber net is inserted into the board, particularly near the surface, the fiber net may be broken or the surface may be broken. Although it is usually difficult to form a fiber net in a board by a wet papermaking method, in the present invention, a net effect is obtained by fusing thermoplastic organic fibers instead of the fiber net in the board even in the wet papermaking method.
【００２２】〔実施例〕表１に各材料の原料組成を示
す。EXAMPLES Table 1 shows the raw material composition of each material.
【表１】 [Table 1]
【００２３】上記原料組成のうち熱可塑性有機繊維と木
片または木質繊維のみをアイリッヒミキサーにて回転混
合すると、該熱可塑性有機繊維はほぐされつゝ木片に絡
まり綿菓子のような綿状になる。こゝでセメントとリジ
ェクトを添加して更に混合し、最後に硬化促進剤と防水
剤および水を添加し混合して原料混合物を調製した。表
１において、比較例１は熱可塑性有機繊維を添加しない
試料、比較例２は熱可塑性有機繊維と木片を予じめ混合
せず、原料全部を一度に混合して原料混合物を調製した
試料である。When the thermoplastic organic fiber and the wood chip or wood fiber alone of the above raw material composition are rotationally mixed by an Erich mixer, the thermoplastic organic fiber is entangled with the wood chip to form a cotton like cotton candy. Here, cement and reject were added and further mixed, and finally, a hardening accelerator, a waterproofing agent and water were added and mixed to prepare a raw material mixture. In Table 1, Comparative Example 1 is a sample in which no thermoplastic organic fiber was added, and Comparative Example 2 was a sample in which the raw material mixture was prepared by mixing all the raw materials at once without mixing the thermoplastic organic fibers and the wood chips in advance. is there.
【００２４】実施例１〜２は上記原料混合物を基板上に
撒布してマットをフォーミングし、面圧３．９ＭＰa で
圧締し、５０℃，１２時間加熱して該マットを一次硬化
させ、常温で４日間の二次硬化を行なった。その後熱間
ロールプレスで板の表裏面を実施例１では１８０℃、２
〜３分間加熱し、実施例２では１４０℃、２〜３分間加
熱し、板の表裏面部分の熱可塑性有機繊維を相互融着せ
しめ点接着させた。実施例３は実施例１、２と同条件の
一次硬化の後図４のようなプログラムのオートクレーブ
養生中で、実施例４は実施例１、２と同条件の一次およ
び二次硬化の後図５のようなプログラムの乾燥工程中
で、それぞれ熱可塑性有機繊維を融着せしめ点接着させ
た。また実施例５は湿式抄造法により作成した。このよ
うにして製造した木質セメント板試料の物性を表２に示
す。In Examples 1 and 2, the above-mentioned raw material mixture was sprayed on a substrate to form a mat, pressed at a surface pressure of 3.9 MPa, heated at 50 ° C. for 12 hours to temporarily cure the mat, For 4 days. Thereafter, the front and back surfaces of the sheet were heated at 180 ° C.
Heating was performed for about 3 minutes, and in Example 2, heating was performed at 140 ° C. for 2 to 3 minutes, so that the thermoplastic organic fibers on the front and back surfaces of the plate were mutually fused and point-bonded. In Example 3, after the primary curing under the same conditions as in Examples 1 and 2, autoclave curing was performed according to the program shown in FIG. 4. In Example 4, the figure after the primary and secondary curing under the same conditions as in Examples 1 and 2. In the drying step of a program such as 5, a thermoplastic organic fiber was fused and point-bonded. Example 5 was prepared by a wet papermaking method. Table 2 shows the physical properties of the wood cement board samples thus manufactured.
【００２５】[0025]
【表２】 [Table 2]
【００２６】表２に示すように、熱可塑性有機繊維を添
加しない比較例１は釘保持力に劣り、また熱可塑性有機
繊維と木片とを予かじめ混合せず、原料全部を一度に混
合した比較例２では熱可塑性有機繊維相互が絡み合って
ダマとなり、板全体に網状に広がらないので、熱可塑性
有機繊維の補強効果が小さく、釘保持力は本発明試料よ
りも小さくなる。As shown in Table 2, Comparative Example 1 in which no thermoplastic organic fiber was added was inferior in nail holding power, and the raw materials were mixed at once without pre-mixing the thermoplastic organic fiber and the wood chips. In Comparative Example 2, since the thermoplastic organic fibers are entangled with each other to form lumps and do not spread in a net shape over the entire board, the reinforcing effect of the thermoplastic organic fibers is small, and the nail holding force is smaller than the sample of the present invention.
【００２７】[0027]
【発明の効果】本発明ではフォーミングされたマット中
に熱可塑性有機繊維の綿状塊中に原料混合物が包含され
た状態の集合体が存在し、該マットを圧締硬化養生して
板とする際に、該熱可塑性有機繊維の綿状塊が板全体に
網状に広がり、更に表層および裏層部分では該熱可塑性
有機繊維相互が融着し、部分接着もしくは点接着してい
るから該板が補強されかつ表面クラックの発生が抑制さ
れる。また表面に深い凹凸模様を形成するような場合に
も、深い凹凸模様を形成した後に熱可塑性有機繊維を相
互に融着し、部分接着もしくは点接着するので表面の崩
れもなくなり鮮明な凹凸模様が容易に得られる。そして
釘打ちの際の外力が該網状に広がった熱可塑性有機繊維
によって分散緩和され、更に木片または木質繊維のまわ
りに絡みついている熱可塑性有機繊維よって木片または
木質繊維が拘束されて割れにくゝなり、また打ち込まれ
た釘に該熱可塑性有機繊維が絡みつくので、裏面の花咲
き現象が抑制されかつ釘保持力が向上する。According to the present invention, an aggregate in which the raw material mixture is contained in the flocculent thermoplastic organic fibers is present in the formed mat, and the mat is pressed and cured to form a plate. At this time, the cotton-like mass of the thermoplastic organic fibers spreads in a net-like manner over the entire board, and furthermore, the thermoplastic organic fibers are fused to each other in the surface layer and the back layer, and are partially adhered or spot-adhered. It is reinforced and the occurrence of surface cracks is suppressed. Also, when forming a deep uneven pattern on the surface, the thermoplastic organic fibers are fused to each other after forming the deep uneven pattern, and partial or point bonding is performed, so the surface does not collapse and clear uneven patterns are formed. Obtained easily. The external force at the time of nailing is dispersed and relaxed by the thermoplastic organic fibers spread in a net-like manner, and further, the wooden chips or the wooden fibers are restrained by the thermoplastic organic fibers entangled around the wooden chips or the wooden fibers, so that the wooden chips or the wooden fibers are hardly cracked. In addition, since the thermoplastic organic fibers are entangled with the driven nail, the flowering phenomenon on the back surface is suppressed and the nail holding power is improved.
【図１】(1)(2)(3)(4)、熱可塑性有機繊維と木片との混
合過程を示す説明図FIG. 1 is an explanatory view showing a mixing process of (1), (2), (3) and (4), a thermoplastic organic fiber and a wood chip.
【図２】基板上にフォ−ミングされたマットの説明図FIG. 2 is an explanatory view of a mat formed on a substrate.
【図３】板の側断面図FIG. 3 is a side sectional view of a plate.
【図４】実施例３における一次硬化後のオートクレーブ
養生プログラム図FIG. 4 is a diagram showing an autoclave curing program after primary curing in Example 3.
【図５】実施例４における二次硬化後の乾燥工程プログ
ラム図FIG. 5 is a program diagram of a drying process after secondary curing in Example 4.
ＯＦ 熱可塑性有機繊維 ＦＬ 木片 ＦＬ’ 木質繊維 Ｐ 粉体 Ｃ 集合体 ＰＲ 製品（板) Ｍe 融着点 OF thermoplastic organic fiber FL wood chip FL 'wood fiber P powder C aggregate PR product (plate) Me fusion point
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０４Ｂ 18:26 Ｃ０４Ｂ 18:26 18:16 18:16 16:02 16:02 Ｚ 16:06） 16:06） Ｚ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C04B 18:26 C04B 18:26 18:16 18:16 16:02 16:02 Z 16:06) 16: 06) Z
Claims (4)
料とを含有する原料混合物の硬化物である木質セメント
板であって、内部には熱可塑性有機繊維の綿状塊中に該
原料混合物が包含されている集合体に由来する該熱可塑
性有機繊維網が全体的に広がっており、表層および／ま
たは裏層部分では該熱可塑性有機繊維は相互融着してい
ることを特徴とする木質セメント板1. A wood cement board which is a cured product of a raw material mixture containing wood chips or wood fibers and a cement-based inorganic material, wherein the raw material mixture is contained in a cotton-like mass of thermoplastic organic fibers. A wood-based cement board characterized in that the thermoplastic organic fiber network derived from the aggregate is spread over the entire surface, and the thermoplastic organic fibers are mutually fused at the surface layer and / or the back layer.
に１．０〜８．０重量％含有されている請求項１に記載
の木質セメント板2. The wood cement board according to claim 1, wherein said thermoplastic organic fiber is contained in the wood cement board in an amount of 1.0 to 8.0% by weight.
拌によって混合することによって該熱可塑性有機繊維を
木片に絡ませつゝ綿状とした上で他の木質セメント板原
料および水とを添加混合して原料混合物を調製し、該原
料混合物を基板上に撒布してマットをフォーミングし、
該マットを圧締硬化養生することを特徴とする請求項１
および２に記載の木質セメント板の製造方法3. The thermoplastic organic fiber is mixed with the wood piece by high-speed rotation and stirring to entangle the thermoplastic organic fiber with the wood piece. Then, the mixture is mixed with another wood cement board raw material and water. To prepare a raw material mixture, and spraying the raw material mixture on a substrate to form a mat,
2. The mat according to claim 1, wherein said mat is cured by press hardening.
PROCESS FOR PRODUCING WOOD CEMENT BOARD SPECIFICED IN AND 2
転攪拌によって混合することによって該熱可塑性有機繊
維を木質繊維に絡ませつゝ綿状とした上で他の木質セメ
ント板原料と共に水に分散させて原料スラリーを調製
し、該原料スラリーを抄造してマットをフォーミング
し、該マットを圧締硬化養生することを特徴とする請求
項１および２に記載の木質セメント板の製造方法4. A thermoplastic organic fiber and a wood fiber are mixed by high-speed rotation stirring to entangle the thermoplastic organic fiber with the wood fiber. The cotton fiber is then dispersed in water together with other wood cement board raw materials. 3. The method for producing a wood cement board according to claim 1, wherein the raw material slurry is prepared by forming the raw material slurry, the mat is formed by forming the raw material slurry, and the mat is pressed and cured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000106366A JP4043687B2 (en) | 2000-04-07 | 2000-04-07 | Wood cement board and method for producing the wood cement board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000106366A JP4043687B2 (en) | 2000-04-07 | 2000-04-07 | Wood cement board and method for producing the wood cement board |
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| Publication Number | Publication Date |
|---|---|
| JP2001294473A true JP2001294473A (en) | 2001-10-23 |
| JP4043687B2 JP4043687B2 (en) | 2008-02-06 |
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ID=18619546
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011201726A (en) * | 2010-03-25 | 2011-10-13 | Ube Industries Ltd | Cement board, fixed structure, and method of fixing cement board |
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2000
- 2000-04-07 JP JP2000106366A patent/JP4043687B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011201726A (en) * | 2010-03-25 | 2011-10-13 | Ube Industries Ltd | Cement board, fixed structure, and method of fixing cement board |
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| JP4043687B2 (en) | 2008-02-06 |
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