JP2004277268A - Extrusion-molded woody cement plate, and production method therefor - Google Patents
Extrusion-molded woody cement plate, and production method therefor Download PDFInfo
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- JP2004277268A JP2004277268A JP2003074697A JP2003074697A JP2004277268A JP 2004277268 A JP2004277268 A JP 2004277268A JP 2003074697 A JP2003074697 A JP 2003074697A JP 2003074697 A JP2003074697 A JP 2003074697A JP 2004277268 A JP2004277268 A JP 2004277268A
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- pulverized
- cement board
- wood
- kneaded
- wood cement
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- 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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00129—Extrudable mixtures
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- 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
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- 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)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は押出成形によって製造される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。
【０００２】
【従来の技術】
従来、例えば外壁材等に使用される木質セメント板は、セメントと、木質パルプとを主体とする原料混合物と水との混練物を平板形状に押出し成形する方法によって製造されている。
上記押出成形セメント板にあっては、木質セメント板、特に押出成形セメント板の廃材の粉砕物を再利用して原料の一部とすることが望ましい（例えば特許文献１〜特許文献５参照）。
例えば特許文献１にあっては押出成形木質セメント板の細骨材として押出成形木質セメント板廃材粉砕物に吸水防止処理を施したものを使用している。
【０００３】
【特許文献１】
特開平８−２２９９１３号公報
【特許文献２】
特許第２９１０２８５号公報
【特許文献３】
特許第３０２３０５７号公報
【特許文献４】
特許第３３２５００５号公報
【特許文献５】
特開２００１−１３９３６３号公報
【０００４】
【発明が解決しようとする課題】
従来は押出成形木質セメント板の原料として木質セメント板廃材粉砕物を再利用する場合、添加量を２０質量％以下にとどめないと、原料混合物と水との混練物に含まれる水を該木質セメント板廃材粉砕物の主として木質成分が吸収するので、水比率を大きくしないと押出成形性が悪化する。しかし水比率を大きくすると製品の比重が小さくなって物性が劣化する、と云う問題がある。
【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手段として、セメントと、木質パルプと、木質セメント板廃材粉砕物とを主体とする原料混合物と水との混練物を押出成形することによって製造された木質セメント板であって、該木質セメント板廃材粉砕物を粒度７５〜１０００μｍの粗粉砕物と、粒度７５μｍ未満の微粉砕物とに分級し、該原料混合物中該粗粉砕物は１０〜２０質量％添加混合され、該微粉砕物は１０〜２５質量％添加混合され、かつ該粗粉砕物と該微粉砕物との合計が２０〜４５質量％になるように設定されている押出成形木質セメント板を提供するものである。
該木質セメント板廃材粉砕物は、微細木質材が添加されている木質セメント板であることが好ましく、また該木質セメント板廃材粉砕物は、ハンマーミルによって粒度３ｍｍ以下に一次粉砕し、更に該一次粉砕物をローラーミルで粒度１ｍｍ以下に二次粉砕し、該二次粉砕物を分級することによって粗粉砕物と微粉砕物とにされることが望ましい。
【０００６】
更にセメントと、木質セメント板廃材粗粉砕物とを含有する原料混合物と水とを混練して一次混練物とし、該一次混練物に更に木質セメント板廃材微粉砕物を添加混練して二次混練物とし、該二次混練物を押出成形し、得られた押出成形物を養生硬化せしめる押出成形木質セメント板の製造方法が提供される。
【０００７】
【作用】
粒度７５〜１０００μｍの粗粉砕物は木質成分が多く含まれており、そして廃材中の木質成分はセメント硬化阻害物質が殆ど出てしまっているので、セメント硬化を阻害せず、かくして該粗粉砕物は含有する木質成分によって補強効果がある。
更に二次粉砕をローラーミルで行なうと、セメント未硬化部分が粒子の外側に露出して来るので、該粗粉砕物は反応性を有し、押出成形体の硬化にある程度関与する。
更にローラーミルによる二次粉砕では、粗粉砕物中の木質分はフィブリル化し、補強効果が向上する。
【０００８】
粒度７５μｍ未満の微粉砕物は押出成形体の細孔や粗粉砕物間に入り込み、成形体の吸水性を抑制し、成形体の膨張や収縮を抑制し、寸法安定性を向上せしめる。また微粉砕物は成形体の細孔や粗粉砕物間に入り込むことによって、成形体内に均一に分散し、成形体の強度分布が均一になり安定化する。
【０００９】
一次混練物中には粗粉砕物が混合されており、該粗粉砕物は一次混練物中の水分を吸収保持している。そこに微粉砕物を添加混練すると、該粗粉砕物中の水分は該微粉砕物に移行し、該粗粉砕物の周囲に該微粉砕物が集まり、該粗粉砕物間に該微粉砕物が介在することにより二次混練物の流動性が向上し、押出成形性が改良され、押出成形体の表面性の悪化が防止される。該微粉砕物は該粗粉砕物に比べて木質分が少なく吸水性が低いので、粗粉砕物のみ添加した場合に比べると水比率を減らすことが出来、成形体の物性の劣化が抑制される。
本発明を以下に詳細に説明する。
【００１０】
【発明の実施の形態】
本発明に使用するセメントは、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。
【００１１】
本発明に使用する木質パルプは、亜硫酸パルプ、ソーダパルプ、クラフトパルプ等の化学パルプ、メカニカルパルプの何れも使用出来、該木質パルプの望ましい繊維長は０．５〜１．０ｍｍである。更に望ましい木質パルプとしては含水率が３０〜５０質量％のブロックパルプを粉砕し、該粉砕物の含水率を２０〜３５質量％になるように調整したものである。ブロックパルプとは製紙工程の途中でパルプがシート状ではなく立体的な塊として脱水されたものである。ブロックパルプの種類は好ましくはＬＢＫＰであるが、ＮＢＫＰが適量混入されても良い。
ブロックパルプは上記範囲の含水率で好ましくはハンマーミルによって粉砕されると、粉砕、叩解が容易でパルプはフィブリル化する。該ブロックパルプは乾燥パルプと比べてかさ比重が小さいので粉砕が容易で粉砕時間が短くなる。
また得られた木質パルプを上記範囲の含水率にすれば、原料混練物中での分散性も良好になり、かつ混練物は押出成形に適度な流動性を有する。
更に該木質パルプの繊維長を上記範囲にすることによって補強効果が充分発揮されかつ混練物中の分散性も良好で押出成形性も向上させることが出来る。
上記木質パルプの水分調整は、通常送風乾燥、所望なれば熱風乾燥によって行なわれる。
【００１２】
上記成分以外、本発明においては、例えばシリカ粉、ケイ砂、ケイ石の粉末、水ガラス、ケイ藻土、ドロマイト、シリカヒューム、高炉スラグ、フライアッシュ、シラスバルーン、パーライト等のケイ酸含有物質等が添加されてもよい。
【００１３】
本発明では更に原料として、木質セメント板廃材の粉砕物を使用する。木質セメント板とは、木片、木質繊維束、木質パルプ、木毛、木粉等の木質成分を補強材として含有するセメント板であり、該木質セメント板は外壁材等の建築板に多く使用されており、最近その廃材の再利用が鋭意検討されている。そして最も有望な再利用は該廃材粉砕物を木質セメント板の原料として使用することである。
再利用効率を高めるには木質セメント板の原料混合物中に出来るだけ多量の該廃材粉砕物を添加することである。
【００１４】
そこで本発明では例えばハンマーミルによって粒度３ｍｍ以下に一次粉砕し、該一次粉砕物を例えばローラーミルによって粒度１ｍｍ以下に二次粉砕し、該二次粉砕物を例えば篩別等によって、粒度７５μｍ（２００メッシュ）〜１０００μｍ（１６メッシュ）の粗粉砕物と、粒度７５μｍ（２００メッシュ）未満の微粉砕物とに分級する。該廃材粉砕の効率を高めるには、廃材として木質パルプや木粉のような微細木質成分を含む木質セメント板の廃材を選択することが望ましい。
【００１５】
該廃材に含まれる木質成分は微粉砕されにくいので粗粉砕物中には比較的多量に含まれ、無機質成分は微粉砕され易いので、微粉砕物中には木質成分は比較的少量しか含まれない。
【００１６】
二次粉砕をローラーミルで行なうと、粗粉砕物にあってはセメントの未硬化部分が外側に露出し、かつ該粗粉砕物中の木質成分はフィブリル化する。したがって該粗粉砕物はセメントと共に硬化反応に関与することが可能であるし、補強効果も有するのでその分原料混合物に添加する木質パルプの添加量を節約することが出来る。
したがって本発明の廃材粉砕物は下記するように押出成形木質セメント板の原料混合物中に２０質量％以上添加混合することが出来る。
【００１７】
本発明の押出成形木質セメント板にあっては、更に吸水性ポリマー、カルボキシメチルセルロース、メチルセルロース、メトキシセルロース、エトキシセルロース、アルギン酸塩、ポリアクリル酸塩等の水溶性高分子、プラスチック発泡体粉砕物、プラスチック発泡性ビーズの予備発泡体、プラスチック発泡性ビーズの完全発泡体、防水剤、撥水剤、顔料、染料等が添加されてもよい。
【００１８】
一般に上記木質パルプは原料混合物中１０質量％以下、セメントとケイ酸含有物質との質量比は５０：５０〜７０：３０程度に設定される。また木質セメント板廃材粉砕物の粗粉砕物は原料混合物中１０〜２０質量％、微粉砕物は原料混合物中１０〜２５質量％、該廃材粉砕物合計としては２０〜４５質量％添加される。
【００１９】
木質セメント板を軽量化するためにはプラスチック発泡体を添加することが望ましい。このようなプラスチック発泡体は、プラスチック発泡体、特にプラスチック発泡体廃棄物の粉砕物、プラスチック発泡性ビーズの予備発泡体、プラスチック発泡性ビーズの完全発泡体等として添加される。上記プラスチック発泡体としては、例えばポリスチレン発泡体、ポリエチレン発泡体、ポリプロピレン発泡体、フェノール樹脂発泡体、メラミン樹脂発泡体等がある。
【００２０】
押出成形の際の成形性を向上させるために、水溶性高分子を添加して混練物の流動性を改良したり、吸水性ポリマーを添加して混練物の保水性を大きくしたりすることが好ましい。
【００２１】
上記原料混合物には水が添加され混練されるが、水の添加量は通常原料混合物１００質量部に対して４０〜７０質量部とされる。
【００２２】
上記混練物は押出機に充填され、該押出機のダイスから板状に押出されるが、押出圧力は通常０．５〜３ＭＰａの範囲に設定する。上記板状に押出された成形物は１００℃以下の加温加湿状態で一次養生され、１００℃以上の高温高圧蒸気で二次養生され、適宜乾燥される。
以下に本発明の実施例を記載する。
【００２３】
【実施例】
木質パルプを含む押出成形木質セメント板廃材をハンマーミルによって粒径３ｍｍ以下に一次粉砕し、更にローラーミルによって粒径１ｍｍ以下に二次粉砕し、篩別によって粗粉砕物と微粉砕物とに分級した。
【００２４】
上記原料混練物を押出圧力１ＭＰａで押出成形し、押出成形体を６０℃の加温加湿状態で８時間一次養生し、該一次養生物をオートクレーブ内で１６０℃、５時間キープして二次養生し、その後更に１２０℃のドライヤーで数時間乾燥し押出成形木質セメント板を得た。該木質セメント板の物性を測定した結果を表１に示す。
【００２５】
【表１】
表１を参照すると、実施例１，２，３，４の試料はいずれも木質セメント板廃材粉砕物を含まない比較例１の試料や該廃材粉砕物を２０質量％以下（１０質量％）で含む比較例２の試料と同等な物性を示す。一方粗粉砕物のみを含む比較例３の試料は実施例１，２，３，４および比較例１，２の試料に比べて比重が若干小さくかつ諸物性、特に表面性に劣り、該廃材粉砕物を４５質量％以上（５１質量％）含む比較例４の試料は実施例１，２，３，４の試料に比べて諸物性が著しく劣ることが認められる。
【００２７】
【発明の効果】
本発明では木質セメント板廃材粉砕物を多量に混合出来る押出成形木質セメント板が提供される。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wood cement board manufactured by extrusion and a method for manufacturing the same.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a wood cement board used for, for example, an outer wall material is manufactured by a method of extruding a kneaded mixture of a raw material mixture mainly composed of cement and wood pulp and water into a flat plate shape.
In the above-mentioned extruded cement board, it is desirable to reuse a pulverized material of a wood cement board, particularly, a waste material of the extruded cement board to be a part of the raw material (for example, see Patent Documents 1 to 5).
For example, in Patent Document 1, as the fine aggregate of the extruded wood cement board, a pulverized extruded wood cement board waste material subjected to a water absorption prevention treatment is used.
[0003]
[Patent Document 1]
JP-A-8-229913 [Patent Document 2]
Japanese Patent No. 2910285 [Patent Document 3]
Japanese Patent No. 3023057 [Patent Document 4]
Japanese Patent No. 3325005 [Patent Document 5]
JP 2001-139363 A
[Problems to be solved by the invention]
Conventionally, when reusing crushed wood cement board waste as a raw material for an extruded wood cement board, water contained in a kneaded mixture of the raw material mixture and water must be added to the wood cement board unless the amount added is 20 mass% or less. Since the woody component of the crushed waste wood material is mainly absorbed, the extrudability deteriorates unless the water ratio is increased. However, there is a problem that when the water ratio is increased, the specific gravity of the product is reduced and the physical properties are deteriorated.
[0005]
[Means for Solving the Problems]
As a means for solving the above-mentioned conventional problems, the present invention provides a wood cement manufactured by extruding a kneaded product of a raw material mixture mainly composed of cement, wood pulp, and a crushed wood cement board waste material, and water. Board, the wood cement board waste material is classified into a coarsely pulverized product having a particle size of 75 to 1000 μm and a finely pulverized product having a particle size of less than 75 μm, and the coarsely pulverized product is added in an amount of 10 to 20% by mass in the raw material mixture. An extruded wood cement board is mixed, and the pulverized material is added and mixed in an amount of 10 to 25% by mass, and the total of the coarsely pulverized material and the finely pulverized material is set to 20 to 45% by mass. To provide.
The crushed wood cement board waste material is preferably a wood cement board to which fine wood material is added, and the crushed wood cement board waste material is primarily pulverized to a particle size of 3 mm or less by a hammer mill, and It is desirable that the pulverized material is secondarily pulverized to a particle size of 1 mm or less by a roller mill, and the secondary pulverized material is classified into a coarsely pulverized product and a finely pulverized product.
[0006]
Further, a raw material mixture containing cement and a coarsely pulverized wood cement board waste material is kneaded with water to form a primary kneaded material, and a further finely pulverized wood cement board waste material is added and kneaded to the primary kneaded material to perform secondary kneading. The present invention provides a method for producing an extruded wood cement board in which the secondary kneaded product is extruded, and the obtained extruded product is cured and cured.
[0007]
[Action]
The coarsely pulverized product having a particle size of 75 to 1000 μm contains a large amount of woody components, and the woody component in the waste wood does not inhibit cement hardening because almost no cement hardening inhibitor has appeared. Has a reinforcing effect due to the contained woody component.
Further, when the secondary pulverization is performed by a roller mill, the uncured portion of the cement is exposed to the outside of the particles, so that the coarsely pulverized material has reactivity and participates in curing of the extruded product to some extent.
Further, in the secondary pulverization by the roller mill, the woody material in the coarsely pulverized material is fibrillated, and the reinforcing effect is improved.
[0008]
The finely pulverized product having a particle size of less than 75 μm enters the pores of the extruded product or between the coarsely pulverized products, suppresses the water absorption of the formed product, suppresses expansion and contraction of the formed product, and improves dimensional stability. Further, the finely pulverized material is uniformly dispersed in the molded body by penetrating into the pores of the molded body or between the coarsely pulverized products, so that the strength distribution of the molded body becomes uniform and stabilized.
[0009]
A coarsely pulverized material is mixed in the primary kneaded material, and the coarsely pulverized material absorbs and retains moisture in the primary kneaded material. When the finely pulverized material is added and kneaded therein, the water in the coarsely pulverized material moves to the finely pulverized material, and the finely pulverized material collects around the coarsely pulverized material. Intervening improves the fluidity of the secondary kneaded material, improves the extrudability, and prevents the surface properties of the extruded product from deteriorating. Since the finely pulverized material has less wood content and lower water absorption than the coarsely pulverized material, the water ratio can be reduced as compared with the case where only the coarsely pulverized material is added, and deterioration of the physical properties of the molded body is suppressed. .
The present invention will be described in detail below.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The cement used in the present invention is, for example, Portland cement, blast furnace cement in which blast furnace slag is mixed with Portland cement, fly ash cement in which fly ash is mixed, silica cement in which silica materials such as volcanic ash and clay are mixed, alumina cement, blast furnace There are slugs and the like.
[0011]
As the wood pulp used in the present invention, any of chemical pulp such as sulfite pulp, soda pulp, kraft pulp and the like, and mechanical pulp can be used. Desirable fiber length of the wood pulp is 0.5 to 1.0 mm. More desirable wood pulp is obtained by pulverizing block pulp having a water content of 30 to 50% by mass and adjusting the water content of the pulverized product to 20 to 35% by mass. Block pulp is obtained by dewatering pulp not as a sheet but as a three-dimensional lump during the papermaking process. The type of block pulp is preferably LBKP, but an appropriate amount of NBKP may be mixed.
When the block pulp is pulverized by a hammer mill with a water content in the above range, it is easily pulverized and beaten, and the pulp is fibrillated. Since the block pulp has a lower bulk specific gravity than the dry pulp, it is easy to pulverize and the pulverization time is shortened.
When the obtained wood pulp has a water content within the above range, the dispersibility in the raw material kneaded material is improved, and the kneaded material has appropriate fluidity for extrusion molding.
Further, when the fiber length of the wood pulp is in the above range, the reinforcing effect is sufficiently exhibited, the dispersibility in the kneaded material is good, and the extrudability can be improved.
The water content of the wood pulp is usually adjusted by blast drying and, if desired, hot air drying.
[0012]
Other than the above components, in the present invention, for example, silica-containing substances such as silica powder, silica sand, silica stone powder, water glass, diatomaceous earth, dolomite, silica fume, blast furnace slag, fly ash, shirasu balloon, pearlite, etc. May be added.
[0013]
In the present invention, a crushed wood cement board waste material is further used as a raw material. A wood cement board is a cement board containing wood components such as wood chips, wood fiber bundles, wood pulp, wood wool, and wood flour as a reinforcing material, and the wood cement board is often used for building boards such as exterior wall materials. Recently, the reuse of the waste materials is being studied earnestly. The most promising reuse is to use the pulverized waste material as a raw material for wood cement boards.
In order to enhance the recycling efficiency, it is necessary to add as much of the pulverized waste material as possible to the raw material mixture for the wood cement board.
[0014]
Therefore, in the present invention, for example, the primary pulverization is performed to a particle size of 3 mm or less by a hammer mill, the primary pulverized product is secondarily pulverized to a particle size of 1 mm or less by a roller mill, for example, and the secondary pulverized product is subjected to a particle size of 75 μm (200 The mixture is classified into a coarsely pulverized product having a mesh size of 1000 μm (16 mesh) and a finely pulverized product having a particle size of less than 75 μm (200 mesh). In order to improve the efficiency of the waste material grinding, it is desirable to select a waste material of a wood cement board containing a fine woody component such as wood pulp or wood flour as the waste material.
[0015]
Since the woody components contained in the waste material are hard to be finely pulverized, they are contained in a relatively large amount in the coarsely pulverized material, and the inorganic components are easily pulverized. Therefore, the relatively small amount of the woody component is contained in the finely pulverized material. Absent.
[0016]
When the secondary pulverization is performed by a roller mill, in the coarsely pulverized material, the uncured portion of the cement is exposed to the outside, and the woody components in the coarsely pulverized material are fibrillated. Therefore, the coarsely pulverized product can participate in the hardening reaction together with the cement, and also has a reinforcing effect, so that the amount of wood pulp to be added to the raw material mixture can be saved accordingly.
Therefore, the pulverized waste material of the present invention can be added to and mixed with the raw material mixture of the extruded wood cement board in an amount of 20% by mass or more as described below.
[0017]
In the extruded wood cement board of the present invention, water-absorbing polymer, water-soluble polymer such as carboxymethylcellulose, methylcellulose, methoxycellulose, ethoxycellulose, alginate, polyacrylate, pulverized plastic foam, plastic A prefoamed foamed bead, a completely foamed plastic foamed bead, a waterproofing agent, a water repellent, a pigment, a dye, and the like may be added.
[0018]
Generally, the wood pulp is set to 10% by mass or less in the raw material mixture, and the mass ratio of cement to the silicic acid-containing substance is set to about 50:50 to 70:30. The coarsely crushed wood cement board waste material is added in an amount of 10 to 20% by mass in the raw material mixture, the finely crushed material is added in an amount of 10 to 25% by mass in the raw material mixture, and the total amount of the crushed waste material is 20 to 45% by mass.
[0019]
In order to reduce the weight of the wood cement board, it is desirable to add a plastic foam. Such plastic foams are added as plastic foams, especially pulverized plastic foam waste, prefoamed plastic foamed beads, full foamed plastic foamed beads and the like. Examples of the plastic foam include polystyrene foam, polyethylene foam, polypropylene foam, phenol resin foam, and melamine resin foam.
[0020]
In order to improve the moldability during extrusion molding, it is possible to improve the fluidity of the kneaded material by adding a water-soluble polymer, or to increase the water retention of the kneaded material by adding a water-absorbing polymer. preferable.
[0021]
Water is added to the raw material mixture and kneaded, and the amount of water added is usually 40 to 70 parts by mass with respect to 100 parts by mass of the raw material mixture.
[0022]
The above kneaded material is filled in an extruder and extruded in a plate shape from a die of the extruder. The extrusion pressure is usually set in a range of 0.5 to 3 MPa. The molded product extruded into a plate shape is primarily cured in a heated and humidified state at a temperature of 100 ° C. or lower, second cured with a high-temperature and high-pressure steam at a temperature of 100 ° C. or higher, and dried as appropriate.
Hereinafter, examples of the present invention will be described.
[0023]
【Example】
Extruded wood cement board waste containing wood pulp is firstly pulverized to a particle size of 3 mm or less by a hammer mill, secondly pulverized to a particle size of 1 mm or less by a roller mill, and classified into coarse and finely pulverized products by sieving. did.
[0024]
The above kneaded material is extruded at an extrusion pressure of 1 MPa, and the extruded product is primarily cured in a heated and humidified state at 60 ° C. for 8 hours, and the primary cured product is kept in an autoclave at 160 ° C. for 5 hours to perform secondary curing. Then, it was further dried for several hours with a dryer at 120 ° C. to obtain an extruded wood cement board. Table 1 shows the measurement results of the physical properties of the wood cement board.
[0025]
[Table 1]
Referring to Table 1, all of the samples of Examples 1, 2, 3, and 4 contained 20% by mass or less (10% by mass) of the sample of Comparative Example 1 containing no crushed wood cement board waste and the crushed waste material. It shows the same physical properties as the sample of Comparative Example 2 including On the other hand, the sample of Comparative Example 3 containing only the coarsely pulverized material had a slightly lower specific gravity and was inferior in various physical properties, particularly the surface properties, as compared with the samples of Examples 1, 2, 3, 4 and Comparative Examples 1 and 2, and the waste material was pulverized. It can be seen that the sample of Comparative Example 4 containing 45% by mass or more (51% by mass) of the substance had significantly inferior physical properties as compared with the samples of Examples 1, 2, 3, and 4.
[0027]
【The invention's effect】
The present invention provides an extruded wood cement board capable of mixing a large amount of pulverized wood cement board waste material.
Claims (4)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003074697A JP4235013B2 (en) | 2003-03-19 | 2003-03-19 | Extruded wood cement board and manufacturing method thereof |
| CNB200410030038XA CN100500607C (en) | 2003-03-19 | 2004-03-18 | Extrusion-molded woody cement plate, and production method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003074697A JP4235013B2 (en) | 2003-03-19 | 2003-03-19 | Extruded wood cement board and manufacturing method thereof |
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| JP2004277268A true JP2004277268A (en) | 2004-10-07 |
| JP4235013B2 JP4235013B2 (en) | 2009-03-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206957A (en) * | 2010-03-31 | 2011-10-05 | 日吉华株式会社 | Wood cement board and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102731025A (en) * | 2011-04-14 | 2012-10-17 | 日吉华株式会社 | Inorganic plate and its manufacturing method |
| CN102731026A (en) * | 2011-04-14 | 2012-10-17 | 日吉华株式会社 | Inorganic plate and its manufacturing method |
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2003
- 2003-03-19 JP JP2003074697A patent/JP4235013B2/en not_active Expired - Fee Related
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206957A (en) * | 2010-03-31 | 2011-10-05 | 日吉华株式会社 | Wood cement board and production method thereof |
| CN102206957B (en) * | 2010-03-31 | 2015-08-19 | 日吉华株式会社 | The manufacture method of Wood cement board |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100500607C (en) | 2009-06-17 |
| JP4235013B2 (en) | 2009-03-04 |
| CN1970493A (en) | 2007-05-30 |
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