JP3970690B2

JP3970690B2 - Wood cement board and manufacturing method thereof

Info

Publication number: JP3970690B2
Application number: JP2002158783A
Authority: JP
Inventors: 哲治竹村; 邦昌松岡
Original assignee: Nichiha Corp
Current assignee: Nichiha Corp
Priority date: 2002-05-31
Filing date: 2002-05-31
Publication date: 2007-09-05
Anticipated expiration: 2022-05-31
Also published as: JP2003340957A

Description

【０００１】
【発明の属する技術分野】
本発明は主として建築物に使用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、セメント硬化物内に木質補強材が分散している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する木質セメント板の、木質セメント板相互の接合施工は、木質セメント板の端部に実加工した相じゃくり施工や、実を加工せずに端部垂直面相互をシ−リング材を介して施工する方法などがあり、近年は施工手間や防水、漏水の問題から木質セメント板相互の接合目地をジョイナ−のみで施工する施工法も増えてきた。
この場合、木質セメント板は図１のように、端部に接合目地凹部（１）を形成されており、接合目地凹部（１）は板厚みから接合の為の凹部の厚みを引いた残りしろ部（３）と、ジョイナ−が施工の際に引っかかる柄合わせ部（２）とによって構成されている。
しかし、相じゃくり施工やシ−リング材施工がある程度の寸法誤差を実やシ−リング材が吸収してくれるのに対し、バックアップ材を入れないジョイナ−での施工はかなりの寸法精度が要求される。
【０００３】
【発明が解決しようとする課題】
このために、寸法精度を出すために、木質セメント板の凹部のないフラットの端部を切削して接合目地凹部を形成していた。
この場合、図６のように、緻密構造を有する表層（１２）裏層（１４）、粗構造を有する芯層（１３）の三層構造の木質セメント板（１１）をまず厚み方向に垂直に切断面（８）で切断し、その切断端部を切削面（９）のように、斜めにそして厚み方向に平行に切断して、柄合わせ部と斜面部を形成していた。
しかし、この方法は、切断による形成なので寸法精度は良いが、切断面、特に斜面部に粗構造で比重が低い芯層（１３）部分が露出して来るので、芯層の木質補強材（木片等）が切断面に出て来ることになり、強度や表面性能、吸水性能、耐久性、対凍性などに悪影響を与える。
このために、切断切削木口面をしっかりと塗装する必要があるのでコストアップになってしまい、また、きちんと塗装しても、どうしても切断切削時に木質補強材がマトリックスから浮きやすく、そのために長期的な耐久性は悪く、塗膜剥離やヘア−クラアック等の問題を起こしていた。
また、ジョイナ−とのジョイント部分も粗構造の芯層（１３）が露出しており、その為にジョイナ−との接合時に欠けたりして不具合が生じやすかった。
【０００４】
また、図７のように、この接合目地凹部（１）を切削ではなく、型板（１７）の凸部によって木質セメント板に予め接合目地凹部用溝（１０）を形成しておき、この接合目地凹部用溝（１０）の中央で縦に１回だけ切断面（８）で切断して接合目地凹部（１）を形成していた。
この方法だと、確かに接合目地凹部（１）の斜面部や柄合わせ部の表面は芯層（１３）の露出がなく、緻密構造で比重の高い表層部が現れるので、強度や表面性能、吸水性能、耐久性、耐凍性などの諸物性は問題がなく、ジョイナ−とのジョイント部分も問題はないが、型板（１７）の長期に亘る使用により、型板自体の収縮等により精度が問題になってくる場合がある。
その為、この型板（１７）を使用した木質セメント板の寸法が変わったりして、接合目地凹部の斜面部や柄合わせ部の寸法がばらつく場合があり、問題となる。
【０００５】
【課題を解決するための手段】
上記の課題を解決するために本請求項１に記載の発明は、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、セメント硬化物のマトリックス内に木質補強材が分散している木質セメント板において、二辺又は四辺の表面端部に接合目地凹部を有し、該接合目地凹部の切削面が緻密構造を有する表層の層内に位置している木質セメント板であることを特徴としている。
上記の構成によれば、接合目地凹部の寸法精度が良く、また、接合目地凹部の強度や表面性能、吸水性能、耐久性等の諸物性の問題のない木質セメント板を得ることが出来る。
【０００６】
また、本請求項２に記載の発明は、前記緻密構造を有する表裏層において表層の厚みが裏層の厚みよりも厚くしてなる木質セメント板であることを特徴としている。
上記の構成によれば、接合目地凹部がより簡単に形成された木質セメント板を得ることが出来る。
【０００７】
また、本請求項３に記載の発明は、前記接合目地凹部の切削面の切削角度が３０〜７０°である木質セメント板であることを特徴としている。
上記の構成によれば、接合目地凹部がより正確に形成された木質セメント板を得ることが出来る。
【０００８】
また、本請求項４に記載の発明は、セメント硬化物のマトリックス内に木質補強材が分散している原料を、木質セメント板に接合目地用溝を形成するための凸部を有する型板上に散布して表層とし、その上にセメント硬化物のマトリックス内に木質補強材が分散している原料を散布して芯層とし、さらにその上にセメント硬化物のマトリックス内に木質補強材が分散している原料を散布して裏層として三層構造とし、プレス成形することでマットを成形するとともに接合目地用溝を成形し、硬化養生したのち、木質セメント板の二辺又は四辺の表面端部の接合目地用溝に切断切削により接合目地凹部を形成し接合目地用凹部の切削面を緻密構造を有する表層の層内に形成することを特徴としている。
上記の構成によれば、接合目地凹部の切削面が緻密構造を有する表層の層内に位置している木質セメント板を製造することが出来る。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態を具体的に説明する。
〔セメント硬化物〕
本発明に用いられるセメント硬化物としては、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、白色セメント等のセメント類がある。上記セメント類には二種以上混合使用されてもよい。
【００１０】
〔木質補強材〕
本発明に用いられる木質補強材としては、木粉、木毛、木片、木質繊維、木質パルプ、木質繊維束、ドライパルプ等が使用される。好ましい木質補強材としては、巾０．５〜２．０ｍｍ、長さ１〜２０ｍｍ、長さと厚みの比率が２０〜３０の木片や、直径０．１〜２．０ｍｍ、長さ２〜３５ｍｍの分枝および／または彎曲および／または折曲した木質繊維束がある。上記木質補強材は二種以上混合されてもよい。また、木質補強材として木質スクラップから再生したものを使用することも出来る。
【００１１】
〔第三成分〕
上記の原料の他に更にセメントの一部をケイ砂、ケイ石粉、シリカフュ−ム、パ−ライト、ベントナイト、珪藻土等の充填材で置換してもいいし、シラスバル−ン、膨張粘土、バ−ミキュライト等の無機軽量体や、マイカ、粘土、キラ、ベントナイト等の無機成分が使用されてもよい。
その他の軽量体として発泡ポリスチレンビ−ズやその他の有機発泡体を添加してもよい。
また、その他の添加剤として、公知の界面活性剤、撥水剤、分散剤、減水剤、セメント硬化促進剤等が使用されてもよい。
【００１２】
〔木質セメント板の製造方法〕
本発明の製造方法としては、乾式製造方法が用いられる。
本発明の木質セメント板の製造方法は、まず、セメント硬化物３０〜６０質量％、ケイ酸含有物質３０〜６０質量％、木質補強材５〜２５質量％を主原料として混合する。
木質補強材としては巾０．５〜２．０ｍｍ、長さ１〜２０ｍｍ、長さと厚みの比率が２０〜３０の木片が好ましい。
これらの原料の全固形分に対し添加水を２５〜４５質量％で添加し、混合し表裏層用原料混合物を得る。
次に、セメント硬化物３０〜６０質量％、ケイ酸含有物質３０〜６０質量％、木質補強材５〜２５質量％を主原料として混合し、これらの原料の全固形分に対して添加水を２５〜４５質量％で添加し、混合して芯層用原料混合物を得る。
木質補強材としては直径０．１〜２．０ｍｍ、長さ２〜３５ｍｍの分枝および／または彎曲および／または折曲した木質繊維束や、巾０．５〜２．０ｍｍ、長さ１〜２０ｍｍ、長さと厚みの比率が２０〜３０の木片が好ましい。
これらの原料混合物を用いて、まず、接合目地用溝を形成するための凸部を有する型板上に表裏層用原料混合物を散布して表層マットとし、その上に芯層用原料混合物を散布して芯層マットとし、さらにその上に表裏層用原料混合物を散布して裏層マットとして三層積層マットをフォ−ミングし、この三層積層マットプレスし圧締硬化させ、更にオ−トクレ−ブ養生や自然養生による養生を行い木質セメント板を得る。
表裏層部の厚みと芯層部の厚みは２：８〜４：６の比率であることが、望ましい。
その後、この木質セメント板の接合目地用溝の中央をカッタ−によりカットし、その後テノ−ナ−やル−タ−によって切削を行い表層の層内に接合目地凹部の切削面を形成し、残りしろ部、柄合わせ部を有する接合目地凹部を形成する。
残りしろ部や柄合わせ部の寸法については特に指定はないが、寸法精度は残りしろ部は±０．５ｍｍ、柄合わせ部は±１．５ｍｍにおさえる。
緻密構造を有している表層の層内に接合目地凹部の切削面を形成しているので、接合目地凹部の寸法精度が良く、また、接合目地凹部の強度や表面性能、吸水性能、耐久性、耐凍性等の諸物性の問題のない木質セメント板を得ることが出来る。
【００１３】
【実施例】
以下、本発明の実施例を挙げる。
【００１４】
〔実施例１〕
下記に示す原料配合にて表裏層、芯層の原料混合物を得、この原料混合物を用いて三層積層のマットを成形し、加圧圧締圧力０．６〜２．０ＭＰａで圧締し、その後、４０〜８０℃の温度で硬化し、更に脱型したのち、温度１２０〜２００℃、飽和水蒸気圧０．２〜１．６ＭＰａでオ−トクレ−ブ養生を４〜１２時間行い、木質セメント板を得た。
表裏層の原料配合は、セメント４８質量％、ケイ砂３２質量％、木片１４質量％、木粉６質量％、添加水３０質量％（固形分に対する外添）で、芯層の原料配合は、セメント４７質量％、ケイ砂３０質量％、木片３質量％、木質繊維束１０質量％、発泡ポリスチレンビ−ズ３質量％、フライアッシュ７質量％、添加水３０質量％（固形分に対する外添）である。
木質セメント板の比重は１．０５、接合目地用溝がある部分の比重は１．２５で、板厚みは１６ｍｍ、溝部のある部分の厚みは１２ｍｍ、表裏層の層厚みはそれぞれ約２ｍｍであった。
この後、図２に示すように、接合目地用溝（４）の中央部分で切断面（８）に沿ってカッタ−によりカットして、接合目地端部（５）を形成し、更に、テノ−ナ−によって接合目地端部（５）の斜面部（６）と溝底部（７）の表層部分を切削面（９）に沿って約１ｍｍ切削し表層の層内に接合目地凹部（１）の切削面を形成した。
その結果、接合目地凹部（１）の残りしろ部は１１ｍｍ、柄合わせ部は２ｍｍの接合目地凹部（１）を得た。
緻密構造を有している表層（１２）の層内に接合目地凹部（１）の切削面を形成したので、接合目地凹部（１）の斜面部（６）、溝底部（７）の外形形状の寸法精度が良く、また、接合目地凹部（１）の強度や表面性能、吸水性能、耐久性、耐凍性等の諸物性の問題のない木質セメント板を得ることが出来た。
【００１５】
〔実施例２〕
実施例１と同様の配合、圧締、硬化、養生条件で、木質セメント板を得た。
図３に示すように、製造条件として、表層原料を裏層原料よりも多く散布して製造した。
その結果、表層（１２）の厚みは約５ｍｍ、裏層（１４）の厚みは約１ｍｍと、表層（１２）の厚みが裏層（１４）の厚みよりも厚くしてなる木質セメント板を得た。
その後、接合目地用溝（４）の中央部分で切断面（８）に沿ってカッタ−によりカットして、接合目地端部（５）を形成し、更に、テノ−ナ−によって接合目地端部（５）の斜面部（６）と溝底部（７）の表層部分を切削面（９）に沿って約２．５ｍｍ切削し表層（１２）の層内に接合目地凹部（１）の切削面を形成した。
その結果、接合目地凹部の残りしろ部は約９．５ｍｍ、柄合わせ部は２ｍｍの接合目地凹部（１）を得た。
緻密構造を有している表層（１２）の層内に接合目地凹部（１）の切削面を形成したので、接合目地凹部（１）の斜面部（６）、溝底部（７）の外形形状の寸法精度が良く、また、接合目地凹部（１）の強度や表面性能、吸水性能、耐久性等の諸物性の問題のない木質セメント板を得ることが出来、また、接合目地凹部（１）がより簡単に形成された木質セメント板を得ることが出来た。
【００１６】
〔実施例３〕
実施例１と同様の配合、圧締、硬化、養生条件で、木質セメント板を得た。
図４に示すように、製造条件として、接合目地用溝（４）を形成するための型板の凸部の斜面の傾斜角度を７０°にして木質セメント板を形成した。
その結果、型板の凸部の斜面が反転した接合目地用溝（４）の斜面部の立ち上がり角度θ１は７０°となった。
その後、接合目地用溝（４）の中央部分で切断面（８）に沿ってカッタ−によりカットして、接合目地端部（５）を形成し、更にテノ−ナ−によって接合目地端部（５）の斜面部（６）と溝底部（７）の表層部分を切削面（９）に沿って、傾斜面角度θ２を６０°で切削し、表層（１２）の層内に接合目地凹部（１）の切削面を形成した。
その結果、接合目地凹部（１）の残りしろ部は約１１ｍｍ、柄合わせ部は２ｍｍの接合目地凹部（１）を得た。
緻密構造を有している表層（１２）の層内に接合目地凹部（１）の切削面を形成したので、接合目地凹部（１）の斜面部（６）、溝底部（７）の外形形状の寸法精度が良く、また、接合目地凹部（１）の強度や表面性能、吸水性能、耐久性等の諸物性の問題のない木質セメント板を得ることが出来、また、接合目地凹部（１）がより正確に形成された木質セメント板を得ることが出来た。
【００１７】
その後、図５に示すように、ジョイナ−（１５）を使用して木質セメント板の接合目地凹部（１）どおしを施工したり、ジョイナ−を使用せずに木質セメント板の接合目地凹部（１）どおしの間にシ−リング材（１６）のみで、施工したり、また、止水片を有しているジョイナ−（１５）を使用して施工した。
【００１８】
【発明の効果】
以上に説明したように、本請求項１に記載の構成によれば、接合目地凹部の寸法精度が良く、また、接合目地凹部の強度や表面性能、吸水性能、耐久性、耐凍性等の諸物性の問題のない木質セメント板を得ることが出来る。
【００１９】
また、本請求項２に記載の構成によれば、接合目地凹部がより簡単に形成された木質セメント板を得ることが出来る。
【００２０】
また、本請求項３に記載の構成によれば、接合目地凹部の外形形状がより正確に形成された木質セメント板を得ることが出来る。
【００２１】
また、本請求項４に記載の構成によれば、接合目地凹部の切削面が緻密構造を有する表層の層内に位置している木質セメント板を製造することが出来る。
【図面の簡単な説明】
【図１】接合目地凹部が形成された木質セメント板の端部の説明図
【図２】実施例１に記載の木質セメント板の端部における接合目地凹部の形成手順の説明図
【図３】実施例２に記載の木質セメント板の端部における接合目地凹部の形成手順の説明図
【図４】実施例３に記載の木質セメント板の端部における接合目地凹部の形成手順の説明図
【図５】本発明に記載の木質セメント板の施工の説明図
【図６】従来の切断切削方式による木質セメント板の端部における接合目地凹部の形成手順の説明図
【図７】従来の切断工程のみによる木質セメント板の端部における接合目地凹部の形成手順の説明図
【符号の説明】
１接合目地凹部
２柄合わせ部
３残りしろ部
４接合目地用溝
５接合目地端部
６斜面部
７溝底部
８切断面
９切削面
１０接合目地凹部用溝
１１木質セメント板
１２表層
１３芯層
１４裏層
１５ジョイナ−
１６シ−リング材
１７型板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood cement board mainly used for buildings and a method for producing the same.
[0002]
[Prior art]
Conventionally, a wood cement board having a three-layer structure composed of a front and back layer having a dense structure in which a wood reinforcing material is dispersed in a hardened cement material and a core layer having a rough structure, the wood cement boards are mutually joined. There are methods such as phase stacking that is actually processed at the end of a wood cement board, and methods that apply vertical end surfaces to each other via a sealing material without processing the fruit. Due to this problem, construction methods for constructing joint joints between wood cement boards using only joiners have increased.
In this case, as shown in FIG. 1, the wood cement board is formed with joint joint recesses (1) at the ends, and the joint joint recesses (1) are the remainders obtained by subtracting the thickness of the recesses for joining from the board thickness. A part (3) and a pattern matching part (2) on which a joiner is caught during construction are constituted.
However, while phase stacking and sealing material construction absorbs a certain amount of dimensional error and the sealing material absorbs it, construction with a joiner that does not include a backup material requires considerable dimensional accuracy. Is done.
[0003]
[Problems to be solved by the invention]
For this reason, in order to obtain dimensional accuracy, a flat end portion of the wood cement board having no recess is cut to form a joint joint recess.
In this case, as shown in FIG. 6, a three-layered wood cement board (11) of a surface layer (12) having a dense structure (12), a back layer (14), and a core layer (13) having a rough structure is first perpendicular to the thickness direction. The cut surface (8) was cut, and the cut end portion was cut obliquely and parallel to the thickness direction like the cut surface (9) to form a pattern matching portion and a slope portion.
However, since this method is formed by cutting, the dimensional accuracy is good. However, the core layer (13) portion having a rough structure and low specific gravity is exposed on the cut surface, in particular, the slope portion. Etc.) will come out on the cut surface, adversely affecting the strength, surface performance, water absorption performance, durability, anti-freezing property, etc.
For this reason, it is necessary to paint the cut cutting face firmly, which increases the cost, and even if it is properly applied, the wood reinforcing material tends to float from the matrix during cutting and cutting. Durability was poor, causing problems such as peeling of the coating film and hair-cracking.
In addition, the coarse core layer (13) is exposed at the joint portion with the joiner, and therefore, it is liable to cause defects due to chipping during joining with the joiner.
[0004]
In addition, as shown in FIG. 7, the joint joint recess (1) is not cut, but a joint joint recess groove (10) is formed in advance in the wood cement board by the convex part of the template (17). A joint joint recess (1) was formed by cutting the cut surface (8) once in the center in the center of the joint recess groove (10).
With this method, the surface of the sloped part of the joint joint recess (1) and the pattern matching part does not have the core layer (13) exposed, and the surface part with a dense structure and high specific gravity appears. There are no problems with various physical properties such as water absorption performance, durability, and frost resistance, and there is no problem with the joint part with the joiner. However, due to the long-term use of the template (17), accuracy is improved due to shrinkage of the template itself. It may become a problem.
For this reason, the dimensions of the wood cement board using this template (17) may change, and the dimensions of the slopes and pattern matching parts of the joint joint recesses may vary, which is a problem.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 has a three-layer structure comprising a front and back layer having a dense structure and a core layer having a rough structure, and wood reinforcement in a matrix of a hardened cement material. In the wood cement board in which the material is dispersed, the wood cement has a joint joint recess at the surface edge of two or four sides, and the cutting surface of the joint joint recess is located in the surface layer having a dense structure It is characterized by being a board.
According to said structure, the dimensional accuracy of a joint joint recessed part is good, and the wood cement board without the problem of various physical properties, such as the intensity | strength of a joint joint recessed part, surface performance, water absorption performance, and durability, can be obtained.
[0006]
The invention according to claim 2 is a wood cement board in which the thickness of the surface layer in the front and back layers having the dense structure is larger than the thickness of the back layer.
According to said structure, the wood cement board in which the joint joint recessed part was formed more easily can be obtained.
[0007]
The invention according to claim 3 is a wood cement board in which the cutting angle of the cutting surface of the joint joint recess is 30 to 70 °.
According to said structure, the wood cement board in which the joint joint recessed part was formed more correctly can be obtained.
[0008]
Further, the invention according to claim 4 is a method in which a raw material in which a wood reinforcing material is dispersed in a matrix of a hardened cement product is formed on a template having convex portions for forming joint joint grooves in the wood cement board. Sprinkle onto the surface layer to spread the raw material with the wood reinforcement dispersed in the hardened cement matrix onto the core layer, and then disperse the wood reinforcing material into the hardened cement matrix After spraying the raw materials, the back layer is made into a three-layer structure, the mat is formed by press molding and the joint joint groove is formed, and after curing and curing, the surface edges of the two or four sides of the wood cement board It is characterized in that a joint joint recess is formed by cutting in the joint joint groove of the part, and a cutting surface of the joint joint recess is formed in a surface layer having a dense structure.
According to said structure, the wood cement board in which the cutting surface of a joint joint recessed part is located in the surface layer which has a dense structure can be manufactured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described.
[Cement cured product]
Examples of the hardened cement used in the present invention include cements such as Portland cement, blast furnace slag cement, silica cement, fly ash cement, alumina cement, and white cement. Two or more of these cements may be used in combination.
[0010]
[Wood reinforcement]
As the wood reinforcing material used in the present invention, wood powder, wood wool, wood fragments, wood fiber, wood pulp, wood fiber bundle, dry pulp, and the like are used. As a preferable wood reinforcing material, a width of 0.5 to 2.0 mm, a length of 1 to 20 mm, a wood piece having a length to thickness ratio of 20 to 30, a diameter of 0.1 to 2.0 mm, and a length of 2 to 35 mm There are branches and / or folded and / or bent wood fiber bundles. Two or more kinds of the wood reinforcing materials may be mixed. Moreover, what was reproduced | regenerated from the wood scrap as a wood reinforcement can also be used.
[0011]
[Third component]
In addition to the above raw materials, a part of the cement may be replaced with fillers such as silica sand, quartzite powder, silica fume, pearlite, bentonite, diatomaceous earth, shirasu balun, expanded clay, bar Inorganic light-weight bodies such as muclite and inorganic components such as mica, clay, glitter and bentonite may be used.
As other lightweight bodies, polystyrene foam beads or other organic foams may be added.
As other additives, known surfactants, water repellents, dispersants, water reducing agents, cement hardening accelerators, and the like may be used.
[0012]
[Manufacturing method of wood cement board]
As the production method of the present invention, a dry production method is used.
The manufacturing method of the wood cement board of this invention mixes 30-60 mass% of hardened | cured cement materials, 30-60 mass% of silicic acid containing substances, and 5-25 mass% of wood reinforcement materials as a main raw material first.
The wood reinforcing material is preferably a wood piece having a width of 0.5 to 2.0 mm, a length of 1 to 20 mm, and a length to thickness ratio of 20 to 30.
Addition water is added at 25 to 45% by mass with respect to the total solid content of these raw materials and mixed to obtain a raw material mixture for the front and back layers.
Next, 30-60% by mass of the hardened cement, 30-60% by mass of the silicic acid-containing material, and 5-25% by mass of the wood reinforcing material are mixed as main raw materials, and added water is added to the total solid content of these raw materials. It adds at 25-45 mass%, and mixes and the raw material mixture for core layers is obtained.
As the wood reinforcing material, a branched and / or bent and / or bent wood fiber bundle having a diameter of 0.1 to 2.0 mm and a length of 2 to 35 mm, a width of 0.5 to 2.0 mm, and a length of 1 to A piece of wood having a length to thickness ratio of 20 to 20 mm is preferred.
Using these raw material mixtures, first, a raw material mixture for front and back layers is spread on a template having projections for forming joint joint grooves to form a surface mat, and then a raw material mixture for core layers is spread thereon. Then, a raw material mixture for the front and back layers is sprayed thereon to form a three-layer laminated mat as a back-layer mat, and this three-layer laminated mat is pressed and cured by pressing. -Carry out curing with natural curing and obtain wood cement board.
The thickness of the front and back layer portions and the thickness of the core layer portion are desirably in a ratio of 2: 8 to 4: 6.
Then, the center of the joint joint groove of the wood cement board is cut with a cutter, and then cut with a tenor or a router to form a cut surface of the joint joint recess in the surface layer, and the rest A joint joint recess having a margin part and a pattern matching part is formed.
The dimensions of the remaining margin and the pattern matching portion are not particularly specified, but the dimensional accuracy is ± 0.5 mm for the remaining margin and ± 1.5 mm for the pattern matching portion.
Since the cut surface of the joint joint recess is formed in the surface layer having a dense structure, the dimensional accuracy of the joint joint recess is good, and the strength, surface performance, water absorption performance, and durability of the joint joint recess It is possible to obtain a wood cement board free from problems of physical properties such as freezing resistance.
[0013]
【Example】
Examples of the present invention will be given below.
[0014]
[Example 1]
A raw material mixture of the front and back layers and the core layer is obtained with the raw material composition shown below, and a three-layered mat is formed using this raw material mixture, and then pressed with a pressing pressure of 0.6 to 2.0 MPa. After curing at a temperature of 40 to 80 ° C. and further demolding, autoclaving is carried out at a temperature of 120 to 200 ° C. and a saturated water vapor pressure of 0.2 to 1.6 MPa for 4 to 12 hours. Got.
The raw material composition of the front and back layers is 48% by mass of cement, 32% by mass of silica sand, 14% by mass of wood pieces, 6% by mass of wood flour, 30% by mass of added water (external addition to the solid content). Cement 47% by weight, silica sand 30% by weight, wood piece 3% by weight, wood fiber bundle 10% by weight, expanded polystyrene beads 3% by weight, fly ash 7% by weight, added water 30% by weight (external addition to solid content) It is.
The specific gravity of the wood cement board is 1.05, the specific gravity of the joint joint groove is 1.25, the plate thickness is 16 mm, the thickness of the groove part is 12 mm, and the thickness of the front and back layers is about 2 mm. It was.
After that, as shown in FIG. 2, the joint joint groove (4) is cut by the cutter along the cut surface (8) at the center portion to form the joint joint end (5). The surface portion of the sloped portion (6) of the joint joint edge (5) and the groove bottom portion (7) is cut by about 1 mm along the cutting surface (9) by means of a joint, and the joint joint recess (1) is formed in the surface layer. A cutting surface was formed.
As a result, a remaining joint portion of the joint joint recess (1) was 11 mm, and a handle joint portion was 2 mm.
Since the cut surface of the joint joint recess (1) is formed in the layer of the surface layer (12) having a dense structure, the outer shape of the slope portion (6) and groove bottom (7) of the joint joint recess (1) Further, it was possible to obtain a wood cement board having good dimensional accuracy and having no problems in physical properties such as strength, surface performance, water absorption performance, durability, and frost resistance of the joint joint recess (1).
[0015]
[Example 2]
A wood cement board was obtained under the same composition, pressing, hardening, and curing conditions as in Example 1.
As shown in FIG. 3, the production conditions were such that the surface layer raw material was sprayed more than the back layer raw material.
As a result, a wood cement board in which the thickness of the surface layer (12) is about 5 mm, the thickness of the back layer (14) is about 1 mm, and the thickness of the surface layer (12) is larger than the thickness of the back layer (14). It was.
Then, the joint joint groove (4) is cut by the cutter along the cut surface (8) at the center portion thereof to form the joint joint end portion (5), and further, the joint joint end portion is formed by the tenor. The surface portion of the slope portion (6) and the groove bottom portion (7) of (5) is cut by about 2.5 mm along the cutting surface (9), and the cutting surface of the joint joint recess (1) in the surface layer (12) layer Formed.
As a result, a joint joint recess (1) having a remaining margin of the joint joint recess of about 9.5 mm and a handle fitting portion of 2 mm was obtained.
Since the cut surface of the joint joint recess (1) is formed in the layer of the surface layer (12) having a dense structure, the outer shape of the slope portion (6) and groove bottom (7) of the joint joint recess (1) In addition, it is possible to obtain a wood cement board free from problems of physical properties such as strength, surface performance, water absorption performance and durability of the joint joint recess (1), and the joint joint recess (1). However, it was possible to obtain a wooden cement board that was more easily formed.
[0016]
Example 3
A wood cement board was obtained under the same composition, pressing, hardening, and curing conditions as in Example 1.
As shown in FIG. 4, as a manufacturing condition, a wood cement board was formed with an inclination angle of the slope of the convex part of the template for forming the joint joint groove (4) being 70 °.
As a result, the rising angle θ1 of the slope portion of the joint joint groove (4) in which the slope of the convex portion of the template was inverted was 70 °.
Then, the joint joint groove (4) is cut by the cutter along the cut surface (8) at the center portion to form the joint joint end portion (5), and further, the joint joint end portion ( 5) The slope portion (6) and the surface layer portion of the groove bottom portion (7) are cut along the cutting surface (9) at an inclined surface angle θ2 of 60 °, and the joint joint recess ( The cutting surface of 1) was formed.
As a result, a joint joint recess (1) having a remaining margin of the joint joint recess (1) of about 11 mm and a handle fitting portion of 2 mm was obtained.
Since the cut surface of the joint joint recess (1) is formed in the layer of the surface layer (12) having a dense structure, the outer shape of the slope portion (6) and groove bottom (7) of the joint joint recess (1) In addition, it is possible to obtain a wood cement board free from problems of physical properties such as strength, surface performance, water absorption performance and durability of the joint joint recess (1), and the joint joint recess (1). Was able to obtain a wood cement board that was more accurately formed.
[0017]
Thereafter, as shown in FIG. 5, the joint joint recess (1) of the wood cement board is constructed using the joiner (15), or the joint joint recess of the wood cement board is used without using the joiner. (1) It was constructed by using only the sealing material (16) during the drip and using a joiner (15) having a water stop piece.
[0018]
【The invention's effect】
As described above, according to the configuration of the first aspect of the present invention, the dimensional accuracy of the joint joint recess is good, and various properties such as the strength, surface performance, water absorption performance, durability, and frost resistance of the joint joint recess are provided. A wood cement board without physical property problems can be obtained.
[0019]
Moreover, according to the structure of this Claim 2, the wood cement board in which the joint joint recessed part was formed more easily can be obtained.
[0020]
Moreover, according to the structure of this Claim 3, the wood cement board in which the external shape of the joint joint recessed part was formed more correctly can be obtained.
[0021]
Moreover, according to the structure of this Claim 4, the wood cement board in which the cutting surface of a joint joint recessed part is located in the surface layer which has a dense structure can be manufactured.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an end portion of a wood cement board in which joint joint recesses are formed. FIG. 2 is an explanatory diagram of a procedure for forming a joint joint recess at an end portion of a wood cement board described in Example 1. Explanatory drawing of the formation procedure of the joint joint recessed part in the edge part of the wood cement board as described in Example 2. [FIG. 4] Explanatory drawing of the formation procedure of the joint joint recessed part in the edge part of the wood cement board as described in Example 3. 5] Explanatory drawing of the construction of the wood cement board according to the present invention. [FIG. 6] Explanatory drawing of the procedure for forming the joint joint recess at the edge of the wooden cement board by the conventional cutting method. [FIG. 7] Only the conventional cutting process. Explanatory diagram of the procedure for forming joint joint recesses at the edge of a wood cement board by using [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Joint joint recessed part 2 Pattern alignment part 3 Remaining margin part 4 Joint joint groove | channel 5 Joint joint edge part 6 Slope part 7 Groove bottom part 8 Cutting surface 9 Cutting surface 10 Joint joint recessed part groove | channel 11 Wood cement board 12 Surface layer 13 Core layer 14 Back layer 15 Joiner
16 Sealing material 17 Template

Claims

In a wooden cement board having a three-layer structure consisting of a front and back layer having a dense structure and a core layer having a rough structure, and a wood reinforcing material dispersed in a matrix of a hardened cement material, the surface edges of two or four sides A wood cement board characterized by having a joint joint recess in a portion, and a cutting surface of the joint joint recess is located in a surface layer having a dense structure

2. The wood cement board according to claim 1, wherein the thickness of the surface layer is larger than the thickness of the back layer in the front and back layers having a dense structure.

The wood cement board according to claim 1 or 2, wherein a cutting angle of a cutting surface of the joint joint recess is 30 to 70 °.

The raw material in which the wood reinforcing material is dispersed in the matrix of the hardened cement is spread on the mold plate with the convex parts to form the joint joint groove on the wood cement board to make the surface layer, and the cement hardening is performed on it Scatter the raw material in which the wood reinforcing material is dispersed in the matrix of the product to form a core layer, and then spray the raw material in which the wooden reinforcing material is dispersed in the matrix of the hardened cement material to the three layers as the back layer. After forming the layer structure and press forming, forming the mat and forming the joint joint groove, curing and curing, then cut and cut the joint joint groove on the surface edge of the two or four sides of the wood cement board by joint cutting Manufacturing method of wood cement board which forms recess and forms cut surface of joint joint recess in surface layer having dense structure