JP2004100375A

JP2004100375A - Building board and painting method therefor

Info

Publication number: JP2004100375A
Application number: JP2002266829A
Authority: JP
Inventors: Shozo Ono; 大野　省三
Original assignee: Nichiha Corp
Current assignee: Nichiha Corp
Priority date: 2002-09-12
Filing date: 2002-09-12
Publication date: 2004-04-02

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building board and a painting method therefor which enable a new color to be expressed in a joint part by a base color and a color of sand, enable a multicolor feeling to be obtained depending on the degree of the distribution of the sand, and can present the design effect of a further natural feel of a mortar joint and can make the overflow of a paint into the joint part less conspicuous, because the color scheme of a pattern omission part and that of the joint part in a protrusive block part are different from each other. <P>SOLUTION: In this building board whose surface is composed of the joint part and the protrusive block part, the sand is not made to adhere to the protrusive block part, the sand is sprayed and fixed on a part or the whole of the joint part, and different colors are presented by a substrate painting color and the color of the sand. The method for painting the surface of the building board comprises a process for applying the paint and an adhesive for the fixation of the sand to the joint part, a process for intermittently spraying the sand on the building board, and a process for removing the sand except the bonded sand from the surface. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明が属する技術分野】
本発明は、例えば建物外壁部に使用される建築板およびその表面塗布方法に関する。
【０００２】
【従来の技術】
従来、外壁用建築板としてセメントやパルプなどから製造した繊維補強セメント板などが存在する。この種の建築板は実際の自然石やタイルの風合いを醸し出すために表面に凹凸模様を付与することが一般的に行われている。また、表面に各種色彩を付与するため、あるいは耐候性を高めるために、各種の塗装仕上げが行われ、例えば、滑り止めや艶消しのために砂のような固体粒状物を散布し固着させる砂撒き塗装や、凹凸模様を予め記憶させ部分的に塗料を塗布し色調を表現するインクジェットによる多色塗装などがあり、表面外観の意匠評価の上で重要な役割を果たしている。
つまり、建築板の意匠評価は凹部と凸部とによるエンボス模様形状や各種塗装による色彩表現が全体としてどのように発揮されているかが重要な要素とされる。
【０００３】
これら意匠の建築板のうち、建築板の凹凸部に応じた塗装および砂の散布により、あたかも本物の自然石のような意匠を発揮させたものが提供されている。また、砂を散布した建築板としては、凹凸模様の陰影効果や深み感を増長させるために、凹部には粒状物の散布部を設けず、凸部にのみ粒状物を散布するもの（特開平１０−６６９３２）、また逆に、凸部には粒状物の散布部を設けず、凹部の少なくとも一部に砂付けがされ、粒度の異なる粒体を付着させ光の反射により凹凸部の陰影効果を強調した建築板が提供されている。（特開昭５５−１１１２５３）
また、その製法として、凹部に選択的にバインダーを塗布できるバインダー塗布手段、表面全体に砂を均一散布する砂散布手段および砂除去手段を備えた建築板の製造システム（特開昭５５−３９３３）や、さらに、本出願人が先に発明したものでは、建築板の凸部には砂の散布部を設けず凹部の少なくとも一部に散布部を設け、凹部斜面部内の少なくとも２つの斜面部は砂付けの分布を異ならせしめることにより、積極的に凹凸模様を表出させ、建築板を見る角度によって異なる意匠とした建築板とその製造システムが提供されている。（特開２０００−３７６５５）
【特許文献１】特開平１０−６６９３２
【特許文献２】特開昭５５−１１１２５３
【特許文献３】特開昭５５−３９３３
【特許文献４】特開２０００−３７６５５
【０００４】
【発明が解決しようとする課題】
一般に、本物の自然石やタイルは様々な色彩があり、これら意匠を忠実に再現することが望まれている。この手法としてインクジェット塗装や印刷塗装などにより部分的な多色塗装が行われているが、砂を散布する建築板の場合においても、その建築板の色彩は充分に考慮されなければならない。従来では、砂撒き建築板の意匠評価は、岩肌感や艶消しの創出といった点では大きな役割を果たしてきたが、砂自体では多色感のある意匠とは言い難く、砂を散布する前の建築板の色彩と砂自身のもつ色彩により、散布後の建築板に新たな色彩を創出させることは殆ど考慮されていなかった。
【０００５】
次に、タイル調や煉瓦調の様な凸状ブロック部を有し、更に該凸状ブロック部表面に高低差がある建築板にツートン塗装を施す場合について触れる。この意匠を表現するには、通常スプレー塗装機などにより全面にベース色が塗装され、更にロール塗装機などにより凸状ブロック部のみに別の色彩のトップ色が塗装される。このとき、凸状ブロック部には高低差があるため、凸状ブロック部内はロール塗装機により塗装されたトップ色の色彩となる部分と、ロール塗装機に塗装されずベース色のままの部分が存在することになり、凸状ブロック部には柄抜部があるように見える。
しかしながら、実際のタイルまたは煉瓦とその目地部に埋め込まれているモルタル目地は互いに異なる材料であり、且つ両者の色彩は異色になっていることが通常である。上記建築板にあたかもタイルや煉瓦のブロックを積み上げ、目地部をモルタル目地とした風合いを表現するには、更に目地部を異なる色彩に塗装するしかなかった。
【０００６】
また、これまで目地部の意匠表現は、凸状ブロック部を引き立たせるための陰影効果の発現や単調な色彩表現しかできず、より自然観のある色彩に仕上げる方法はあまり検討されていなかった。また、従来の特許文献に開示されているように、砂を目地部に単に散布した場合は、目地部に砂の色彩のみが表出されるため、色彩表現が単調になってしまい、また色彩の階調表現をすることもできない。
【０００７】
一方、多色塗装を実現させるためインクジェット塗装や印刷塗装により建築板に部分的な塗装をおこなうものが開示されているが、凸状ブロック部のみに部分塗装を行う際、建築板自体の柄模様のズレ、および塗装時の搬送精度のばらつきにより、結果的に凸状ブロック部の一部に塗装した塗料が目地部などの低い部分に流れ込んでしまう所謂塗料のこぼれが生じるケースがある。このこぼれが生じた場合、凸状ブロック部の色彩が目地部にはみ出し本来の目地部の色彩を忠実に表現することができなくなってしまい、特にタイル調や煉瓦調の建築板においては表面外観の意匠評価に悪影響を及ぼすといった問題点を有していた。
【０００８】
すなわち、本発明は上記課題を解決するためになされたものであり、砂を散布する前の建築板の色彩と砂自身のもつ色彩により散布後の建築板に新たな色彩を創出させ、且つ目地部に生じる多色塗装色のこぼれを目立たなくさせる建築板及びその塗装方法を提供することを目的とするものである。
【０００９】
【課題を解決するための手段】
本発明では上記課題を解決するために、請求項１では、目地部と凸状ブロック部からなる表面を有し、凸状ブロック部には砂付けがされておらず目地部の一部または全部に砂が散布固着された建築板であって、砂が散布固着された部分の色彩は、砂の色彩と下地塗装色の色彩とにより異色を呈することを特徴とする建築板について提供するものである。
上記構成によれば、目地部の色彩が砂の散布前後で同一になることがなくなるので、新たな色彩が表出され、建築板表面は多様な仕上がり感とすることが可能となる。
【００１０】
また、砂が散布された部分の色彩は段階的に変化していてもよく、この場合は目地部の色彩が階調的に変化する建築板表面とすることが可能となる。
また、このとき砂が散布された部分の色彩は砂の色彩と砂が散布される前の目地部の色彩との中間色であってもよい。また、砂が散布された部分の色彩は建築板内の他のどの色彩にも同一とされない色彩としてもよい。
【００１１】
上記構成によれば、目地部の色彩は散布する砂の色彩と砂が散布される前の目地部の色彩とが共存することになり、特に遠方から確認すれば新たな色彩が表出され、建築板表面は多様な色彩表現が可能となる。また、目地部の面積中、砂粒の面積と残りの面積が同一であれば、両者の色彩の中間色とすることが可能となり、また砂の色彩を選定することで、全く新しい色彩を演出することが可能となる。
【００１２】
また、本請求項５では、目地部と凸状ブロック部からなる建築板の目地部の一部または全部に、砂を固着させるための塗料および／または接着剤を塗装する工程と、砂を建築板に間欠的に散布する工程と、塗料および／または接着剤に固着していない砂を表面から除去する工程、とからなることを特徴とする建築板の表面塗装方法に関するものである。この際、砂の散布量を５０〜２００ｇ／ｍ^２とすることが好ましい。
上記構成によれば、適量を散布した砂の色彩と砂を散布する前の目地部の色彩とにより、全く新しい色彩を演出することが可能になる。このとき、砂の散布量を５０〜２００ｇ／ｍ^２としたのは次の理由による。すなわち、散布量が５０ｇ／ｍ^２未満であると目地部の色彩が目立ちすぎ新規の色彩を得ることができず、逆に散布量が２００ｇ／ｍ^２より大きいと目地部の色彩は砂にほとんど覆われて砂の色彩のみしか表現することができない。
【００１３】
【発明の実施の形態】
以下添付図面を参照しながら、本発明の好適な実施形態について詳細を説明する。図１は本発明の一実施の形態による建築板の正面概略図、図２（Ａ）はその部分拡大図、図２（Ｂ）はその拡大断面図である。
図１に示すように、本例の建築板は凸状ブロック部２と目地部３により構成されており、目地形状は馬目地状の煉瓦調の意匠である。さらに、本例の場合、煉瓦の古雅感を醸し出すために、凸状ブロック部２には高低差があり頂点部４ａと柄抜部４ｂが構成されている。このような凸状ブロック部の表面高さが異なる建築板には、スプレー塗装機とロール塗装機などでツートン塗装を行われており、ロール塗装機に塗装された頂点部４ａと塗装されない柄抜部４ｂが生じる。よって、柄抜部４ｂの色彩は頂点部４ａの色彩と当然ながら異なることになり、スプレー塗装機による目地部の色彩と同一色になっている。本例の場合、凸状ブロック部２は煉瓦状としたが、この形状に限定されるものではなく、凸状ブロック部と目地部があればあらゆる形状に対応できる。
【００１４】
建築板の表面を仕上げる手法は上記のような凸部と凹部を塗り分けるツートン塗装の他、予め保存された柄形状に基づき選択的に塗料を塗布するインクジェット塗装など様々な手法があり、その他にも建築板表面に砂肌感を創出するために、珪砂やカラーサンドなどの砂を散布固着させる手法がある。例えば、ツートン塗装された建築板の目地部にのみに更に砂が散布固着されることで、建築板表面の凹凸模様による凹凸感が強調され、十分な立体感のある意匠にすることができる。
本発明の実施形態の図２（Ａ）の例では、ツートン塗装された煉瓦調の建築板表面の目地部にのみ砂１０が散布されたものである。本例に限らず、砂が目地部の一部分に散布されていてもよく、また、一方向のみに帯状に散布されてもよいし、非連続的に散布されてもよい。また、更に他の散布態様であってもよい。
図２（Ｂ）にそのＸ−Ｙ断面図を示す。本例では、目地部内の全幅に砂が散布されている。これに限らず、幅の一部に砂が散布されるようにしてもよいし、さらに、砂の粒径はどのようなものを用いてもよい。
【００１５】
但し、ここで重要な点は、砂が散布された部分に関し、目地部３に砂が散布される以前に予めスプレー塗装機により塗装された色彩（ベース色）は全て砂で覆い被されることがなく、ベース色の一部が砂と砂の間に残存するようにしている。つまり、図２（Ａ）に示すように、建築板表面に砂を間欠的に散布し、目地部の色彩と砂の色彩の両者が混在している状態としている。このとき、特に建築板を遠方から目視すれば砂を散布した部分の色彩は、両者の混合色に変化し異色を呈する。
【００１６】
ここで、砂は粒子径を約２ｍｍとした珪砂とし、建築板のベース色と対比して明度、彩度、色相のいずれかが異なるようにしている。本例の場合は、ベース色を白色とし、砂色をダークブラウン色としている。これに限らず、ベース色の色彩はダークグレー系の色彩、砂の色彩は白色とした組み合わせでもよく、両者の色彩は表現すべき色彩に合わせて適宜選択可能である。
【００１７】
また、砂を間欠的に散布する際に、砂付けの分布を変えながら散布すると、階調的な色彩が表出される。例えば、図２（Ａ）の場合、ダークブラウン色の砂の散布量や粒径を段階的に変え、砂が異なる比表面積で散在しており、右側よりも左側の方が砂の比表面積が大きくなるように設定散布されている。よって、散布固着された後の建築板表面の色彩はライトブラウン色でも淡色からより濃色のライトブラウン色へ階調変化が生じることになる。これにより、本物の自然石に見られるような多色感のある意匠が表現される。また、これに限らず、選択的に散布量を変化させ部分的なグラデーションを表現するなどの階調表現としてもよい。
ベース色の面積と砂の色彩が一定面積中均等の比率で分散されていれば、両者の色彩の中間色が表出される。この例では、白色であるベース色の面積とダークブラウン色である砂の色彩との面積が均等な比率になるようにすれば、ライトブラウン色の中間色を表現できる。他の例では、ベース色の色彩をダークグレー系の色彩とし、砂の色彩を白色とし、一定面積中に両者を均等な比率になるよう砂が分散されれば、ライトグレー色の新たな色彩が表現できる。
【００１８】
また、建築板をインクジェット塗装など多色塗装仕上げ板とし、同様のことを行うのもよい。凸状ブロック部のみに部分的に塗装する際、建築板自体の柄模様のズレ、および塗装時の搬送精度のばらつきにより、結果的に凸状ブロック部の一部に塗料が流れ込み色彩に違和感を生じさせる場合がある。このときにおいても、目地部に砂を散布させ、新たな色彩を表出させるようにすればこぼれを目立ちにくくさせることができる。
【００１９】
次に、製造工程の一実施例を示す建築板の断面図を図３に示す。本例では、凸状ブロック部の表面高さが異なる建築板にツートン塗装をし、その後に砂撒き塗装を行う工程を示す。この場合、スプレーなどにより全面に下塗り塗料、および中塗り塗料１１を塗装した後（工程１）、ロール塗装機などにより凸状ブロック部の表面に別の色の上塗り塗料１２を塗装する（工程２）。次に、目地部３のみに砂固着用塗料１３を選択的に塗装し、建築板全面に対し砂１０を間欠的に散布し、余分に散布された砂１０を建築板表面からエアブローを用いて除去する（工程３）。最後に仕上げとしてクリヤ塗料１４などの仕上げ塗装（工程４）を実施し、乾燥後建築板を搬出する。
【００２０】
本製造方法では、砂が散布された目地部の色彩はベース色の一部が砂と砂との間に残存し両者の色彩が混在している状態になる。よって、目地部は凸状ブロック部の柄抜部の色彩とは異なった新たな色彩が表現されることになり、実物の煉瓦間に存在するモルタル目地の風合いを表現することが可能となる。適宜、砂の散布度合いや砂の色彩を変えて散布することで、色彩の階調表現や好みの色彩を演出することができる。
【００２１】
ここで、本例の製造条件を示す。砂固着用塗料は例えばアクリルウレタン系やアクリルシリコン系のクリヤ塗料を用い、粘度を１１秒（イワタカップ）に設定し、これを塗布量約１５０ｇ／ｍ^２となるよう、溝部塗装機を用いて、目地部に砂固着用の塗装層を形成した。この塗料層が乾燥する前に砂散布機により、目地部とは色彩の異なる散布量約１５０ｇ／ｍ^２の砂を建築板全体にベース色が残るように吹き付け塗装した。また、砂は珪砂の他カラーサンドでもよく、粒径は意匠や色彩表現に応じて適宜選択できる。また、適宜実施される表面クリヤ仕上げはアクリルウレタン系のクリヤ塗料が一般的に用いられ、塗布量は約１２０ｇ／ｍ^２とすることが望ましい。また、砂固着用の塗料を塗装するには溝部塗装機のほかインクジェット塗装機など選択的に塗装できるものであれば何れの装置を用いてもよい。
砂の散布量が５０ｇ／ｍ^２未満の場合、目地部の色彩が目立ちすぎてしまい、逆に散布量が２００ｇ／ｍ^２より大きいと目地部の色彩は砂にほとんど覆われて砂本来の色彩を表現することしかできず、散布量は５０〜２００ｇ／ｍ^２の範囲が望ましい。
【００２２】
【発明の効果】
上記建築板とその塗装方法によれば、目地部にベース色の色彩と砂の色彩により新たな色彩に表現することができ、砂の分布度合いにより多色感を得ることができる。また、凸状ブロック部内の柄抜部と目地部の配色が異なることになるので、より自然なモルタル目地の風合いの意匠効果を表出させることができる。また、塗料の目地部へのこぼれを目立ちにくくさせることができる。
【図面の簡単な説明】
【図１】建築板の正面図
【図２】（Ａ）建築板の拡大図（Ｂ）建築板の拡大断面図
【図３】一連の製造工程での建築板の拡大断面模式図
【符号の説明】
２　　　凸状ブロック部
３　　　目地部
４ａ　　　頂点部
４ｂ　　　柄抜部
１０　　　砂[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a building board used for, for example, a building outer wall, and a method for applying the surface thereof.
[0002]
[Prior art]
Conventionally, as a building board for an outer wall, there is a fiber reinforced cement board manufactured from cement, pulp, or the like. This type of building board is generally provided with an uneven pattern on the surface in order to bring out the texture of actual natural stones and tiles. In addition, in order to impart various colors to the surface or to enhance the weather resistance, various paint finishes are performed, for example, sand particles for spraying and fixing solid particulate matter such as sand for slip prevention and matting. There are spray painting and multicolor painting by ink-jet, which expresses a color tone by partially applying a paint in which an uneven pattern is stored in advance and plays an important role in the design evaluation of the surface appearance.
In other words, an important factor in the design evaluation of a building board is how the embossed pattern shape by the concave portions and the convex portions and the color expression by various coatings are exhibited as a whole.
[0003]
Among the architectural boards of these designs, there are provided architectural boards that exhibit a design as if they were real natural stones by painting and spraying sand according to the unevenness of the architectural boards. In addition, as a construction board to which sand is scattered, in order to increase the shading effect of a concavo-convex pattern and a sense of depth, a scattered part is not provided in a concave part, and a granular substance is scattered only in a convex part (JP-A-Hei. 10-66932) On the contrary, the projections are not provided with a scattering portion of the granular material, and at least a part of the depressions are sanded, and particles having different particle sizes are attached to the projections to reflect light, thereby shading the irregularities. Is provided. (Japanese Patent Laid-Open No. 55-111253)
Further, as a method for producing the same, a building board manufacturing system provided with a binder applying means capable of selectively applying a binder to the concave portion, a sand spraying means for uniformly spraying sand over the entire surface, and a sand removing means (Japanese Patent Laid-Open No. 55-3933). In addition, in the inventor of the present invention, the projecting portion of the building board is not provided with a scattered portion of sand, and a scattered portion is provided on at least a part of the recessed portion. There is provided an architectural board having a different design depending on the angle at which the architectural board is viewed by positively expressing a concavo-convex pattern by making the distribution of sanding different, and a manufacturing system thereof. (JP-A-2000-37655)
[Patent Document 1] JP-A-10-66932
[Patent Document 2] JP-A-55-111253
[Patent Document 3] JP-A-55-3933
[Patent Document 4] JP-A-2000-37655
[0004]
[Problems to be solved by the invention]
Generally, real natural stones and tiles have various colors, and it is desired to faithfully reproduce these designs. As this method, partial multi-color coating is performed by ink-jet coating, printing coating, or the like. Even in the case of a building board to which sand is scattered, the color of the building board must be sufficiently considered. In the past, design evaluation of sand-sprayed building boards has played a major role in terms of creating a feeling of rock surface and matting, but it is difficult to say that sand itself is a multicolored design. There was little consideration given to the creation of new colors on the building boards after spraying, based on the colors of the boards and the colors of the sand itself.
[0005]
Next, a case will be described in which a two-tone coating is applied to a building board having a convex block portion having a tile-like or brick-like tone and further having a height difference on the surface of the convex block portion. In order to express this design, a base color is usually applied to the entire surface by a spray coating machine or the like, and a top color of another color is applied only to the convex block portion by a roll coating machine or the like. At this time, since the convex block portion has a height difference, the inside of the convex block portion has a portion of the top color painted by the roll coating machine and a portion of the base color which has not been painted by the roll painting machine. As a result, the convex block portion appears to have a pattern blank.
However, the actual tile or brick and the mortar joint embedded in the joint are made of different materials, and the colors of the two are usually different colors. The only way to express the texture with the joints being mortar joints as if the blocks of tiles or bricks were stacked on the building board was to paint the joints in different colors.
[0006]
Until now, the design of the joints has been limited to the expression of a shading effect or a monotonous color expression for enhancing the convex block portion, and a method of finishing the color with a more natural appearance has not been studied much. Further, as disclosed in the conventional patent document, when the sand is simply sprayed on the joints, only the color of the sand is expressed on the joints, so that the color expression becomes monotonous, and Neither can gradation expression be performed.
[0007]
On the other hand, there has been disclosed a method of performing partial coating on a building board by inkjet coating or printing coating in order to realize multicolor coating, but when performing partial coating only on a convex block portion, a pattern pattern of the building board itself is disclosed. There is a case in which the so-called paint spills in which the paint applied to a part of the convex block portion flows into a low portion such as an joint portion as a result of the deviation and the variation in the transport accuracy at the time of painting. When this spill occurs, the color of the convex block part protrudes into the joint part and it becomes impossible to faithfully represent the color of the original joint part. There was a problem that it adversely affected the design evaluation.
[0008]
That is, the present invention has been made to solve the above-described problems, and a new color is created on a building board after being sprayed by the color of the building board before spraying the sand and the color of the sand itself, and the joint is made. It is an object of the present invention to provide a building board and a method for coating the same, which makes the spill of a multi-color coating color generated in a part inconspicuous.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention has a surface having a joint portion and a convex block portion, and the convex block portion is not sanded and part or all of the joint portion. The construction board provided with sand dispersed and fixed to the building board, wherein the color of the portion to which the sand is dispersed and fixed exhibits a different color depending on the color of the sand and the color of the base coat color. is there.
According to the above configuration, the color of the joint portion does not become the same before and after the application of the sand, so that a new color is displayed, and the surface of the building board can have various finished feelings.
[0010]
Further, the color of the portion where the sand is scattered may be changed stepwise, and in this case, it is possible to provide a building board surface in which the color of the joint portion changes in gradation.
At this time, the color of the portion where the sand is scattered may be an intermediate color between the color of the sand and the color of the joint before the sand is scattered. The color of the portion where the sand is scattered may be a color that is not the same as any other color in the building board.
[0011]
According to the above configuration, the color of the joints is such that the color of the sand to be scattered and the color of the joints before the sand is scattered coexist, and a new color is displayed especially when confirmed from a distance, Various colors can be expressed on the building board surface. In addition, if the area of the sand grains and the remaining area are the same in the area of the joint, it is possible to set a neutral color between the two colors, and to produce a completely new color by selecting the color of the sand Becomes possible.
[0012]
Further, in the present invention, a step of applying a paint and / or an adhesive for fixing the sand to a part or all of the joints of the building board composed of the joints and the convex block parts; The present invention relates to a method for painting a surface of a building board, comprising: a step of intermittently spraying the board; and a step of removing sand not adhered to a paint and / or an adhesive from a surface. At this time, it is preferable that the amount of sand to be sprayed is 50 to 200 g / m ² .
According to the above configuration, a completely new color can be produced by the color of the sand sprayed with an appropriate amount and the color of the joint before spraying the sand. At this time, the reason why the amount of the sprayed sand is 50 to 200 g / m ² is as follows. That is, if the amount of application is less than 50 g / m ² , the color of the joint is too conspicuous and a new color cannot be obtained. Conversely, if the amount of application is more than 200 g / m ² , the color of the joint is almost Only the color of the sand covered can be expressed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic front view of a building board according to an embodiment of the present invention, FIG. 2A is a partially enlarged view thereof, and FIG. 2B is an enlarged sectional view thereof.
As shown in FIG. 1, the building board of the present embodiment includes a convex block portion 2 and joint portions 3, and the joint shape is a horseshoe-like brick-like design. Further, in the case of the present example, in order to bring out the elegance of the brick, the convex block portion 2 has a height difference, and a vertex portion 4a and a pattern blank portion 4b are formed. Two-tone painting is performed on building boards having different surface heights of such convex block portions by using a spray painting machine and a roll painting machine, and a vertex portion 4a painted on the roll painting machine and an unpainted pattern removal. A part 4b results. Therefore, the color of the pattern removal portion 4b is naturally different from the color of the vertex portion 4a, and is the same color as the color of the joint portion by the spray coating machine. In the case of this example, the convex block 2 is made of a brick. However, the shape is not limited to this, and any shape can be used as long as the convex block 2 and the joints are provided.
[0014]
There are various methods for finishing the surface of the building board, such as two-tone coating that separately paints convex parts and concave parts as described above, ink jet coating that selectively applies paint based on the pattern shape stored in advance, and others. There is also a method of spraying and fixing sand such as silica sand or color sand to create a feeling of sand on the building board surface. For example, the sand is further sprayed and fixed only to the joints of the two-tone painted building board, whereby the unevenness due to the uneven pattern on the building board surface is emphasized, and a design having a sufficient three-dimensional appearance can be obtained.
In the example of FIG. 2A of the embodiment of the present invention, the sand 10 is sprayed only on the joints on the surface of the two-tone painted brick-like building board. The present invention is not limited to this, and the sand may be sprayed on a part of the joint portion, may be sprayed in a band shape only in one direction, or may be sprayed discontinuously. Further, another spraying mode may be adopted.
FIG. 2B shows an XY cross-sectional view thereof. In this example, sand is sprayed over the entire width in the joint. However, the present invention is not limited thereto, and sand may be sprayed on a part of the width, and any particle size of the sand may be used.
[0015]
However, the important point here is that, with regard to the portion where the sand is scattered, all the colors (base colors) previously painted by the spray coating machine before the sand is scattered on the joint portions 3 are covered with the sand. There is no base color and some of the base color remains between the sands. That is, as shown in FIG. 2A, sand is intermittently sprayed on the surface of the building board, and both the color of joints and the color of sand are mixed. At this time, especially when the building board is viewed from a distance, the color of the portion where the sand is scattered changes to a mixed color of the two and presents a different color.
[0016]
Here, the sand is silica sand having a particle diameter of about 2 mm, and any one of lightness, saturation, and hue is different from the base color of the building board. In this example, the base color is white and the sand color is dark brown. The color of the base color is not limited to this, and the color of the base color may be a dark gray color and the color of the sand may be white, and both colors can be appropriately selected according to the color to be expressed.
[0017]
In addition, when the sand is intermittently scattered, if the scatter is changed while the distribution of the sanding is changed, a gradation color is displayed. For example, in the case of FIG. 2 (A), the scattering amount and particle size of the dark brown sand are changed stepwise, and the sand is scattered with different specific surface areas, and the specific surface area of the sand is larger on the left side than on the right side. The settings are set to be larger. Therefore, the color of the surface of the building board after the spray fixing is changed from a light color to a darker light brown color even in a light brown color. As a result, a multicolored design as seen in a real natural stone is expressed. Further, the present invention is not limited to this, and may be a gradation expression such as selectively changing the amount of application to express a partial gradation.
If the area of the base color and the color of the sand are dispersed at an equal ratio in a certain area, an intermediate color between the two colors is displayed. In this example, if the area of the white base color and the area of the dark brown color of sand have an equal ratio, an intermediate color of the light brown color can be expressed. In another example, if the color of the base color is a dark gray color, the color of the sand is white, and the sand is dispersed so that the two are evenly distributed in a certain area, a new color of the light gray color will be created. Can be expressed.
[0018]
It is also possible to make the building board a multicolored finished board such as an inkjet coating, and to do the same. When partially painting only the convex block, the paint flows into a part of the convex block as a result of the displacement of the pattern of the building board itself and the dispersion of the conveyance accuracy at the time of painting, and the color is uncomfortable. May cause. Also at this time, spills can be made less noticeable by spraying sand on the joints to express a new color.
[0019]
Next, FIG. 3 is a cross-sectional view of a building board showing one embodiment of a manufacturing process. In this example, a process of performing two-tone coating on building boards having different surface heights of the convex block portions, and thereafter performing sand-spray coating is shown. In this case, the undercoat and the intermediate paint 11 are applied to the entire surface by spraying or the like (Step 1), and then the top coat 12 of another color is applied to the surface of the convex block portion by a roll coater or the like (Step 2). ). Next, only the joint portion 3 is selectively coated with the paint 13 for fixing the sand, the sand 10 is intermittently sprayed over the entire surface of the building board, and the excess sand 10 is sprayed from the surface of the building board using air blow. Remove (step 3). Finally, finish painting (step 4) such as clear paint 14 is performed as a finish, and after drying, the building board is carried out.
[0020]
In the present manufacturing method, the color of the joint portion where the sand is scattered is such that a part of the base color remains between the sand and the two colors are mixed. Therefore, the joint portion expresses a new color different from the color of the pattern removal portion of the convex block portion, and it is possible to express the texture of the mortar joint existing between the actual bricks. By appropriately changing the spraying degree of the sand or the color of the sand, the gradation expression of the color and the desired color can be produced.
[0021]
Here, the manufacturing conditions of this example will be described. For example, an acrylic urethane-based or acrylic silicon-based clear paint is used as the sand-fixing paint, the viscosity is set to 11 seconds (Iwata cup), and the applied amount is about 150 g / m ² using a groove coating machine. Then, a coating layer for fixing the sand was formed on the joint. Before this coating layer was dried, sand having a spraying amount of about 150 g / m ² different in color from the joint portion was spray-coated with a sand sprayer so that the base color remained on the entire building board. The sand may be color sand in addition to silica sand, and the particle size can be appropriately selected according to the design and color expression. An acrylic urethane clear paint is generally used for the surface clear finish appropriately performed, and the coating amount is preferably about 120 g / m ² . In addition, in order to apply the sand-fixing paint, any apparatus can be used as long as it can be selectively applied, such as an ink jet coater, in addition to a groove coater.
If the amount of sand scattered is less than 50 g / m ² , the color of the joint is too conspicuous, and if the amount of spray is more than 200 g / m ² , the color of the joint is almost covered with sand and the original color of the sand Can be expressed only, and the spraying amount is desirably in the range of 50 to 200 g / m ² .
[0022]
【The invention's effect】
According to the above-mentioned building board and its coating method, a new color can be expressed by the color of the base color and the color of the sand at the joint portion, and a multi-colored feeling can be obtained depending on the degree of distribution of the sand. In addition, since the color arrangement of the pattern removal portion and the joint portion in the convex block portion is different, a more natural design effect of the texture of the mortar joint can be exhibited. In addition, it is possible to make the spill of the paint to the joints less noticeable.
[Brief description of the drawings]
FIG. 1 is a front view of a building board. FIG. 2A is an enlarged view of a building board. FIG. 3B is an enlarged sectional view of a building board. FIG. Description】
2 convex block part 3 joint part 4a vertex part 4b handle removal part 10 sand

Claims

A building board that has a surface consisting of joints and convex blocks, where the convex blocks are not sanded and sand is sprayed and fixed to part or all of the joints. An architectural board characterized in that the color of the fixed portion has a different color depending on the color of the sand and the color of the undercoat.

2. The building board according to claim 1, wherein the color of the portion to which the sand is scattered and fixed changes stepwise.

2. The building board according to claim 1, wherein the color of the portion where the sand is sprayed and fixed is an intermediate color between the color of the sand and the color of the undercoat.

2. The building board according to claim 1, wherein the color of the portion where the sand is scattered and fixed is not the same as any other color in the building board.

A step of applying a paint and / or an adhesive for fixing the sand to a part or the whole of the joint part of the building board composed of the joint part and the convex block part, and a step of intermittently applying the sand to the building board And removing sand not fixed to the paint and / or the adhesive from the surface.

In claim 5, the surface coating method of building board, characterized in that the application rate of the sand and 50 to 200 g / ^{m 2.}