JP3758806B2

JP3758806B2 - Decorative plate manufacturing method

Info

Publication number: JP3758806B2
Application number: JP11385997A
Authority: JP
Inventors: 正秋山; 一彦三井
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 1997-05-01
Filing date: 1997-05-01
Publication date: 2006-03-22
Anticipated expiration: 2017-05-01
Also published as: JPH10305546A

Description

【０００１】
【発明の属する技術分野】
本発明は、建築用化粧板、特に天井板として用いるのに適していて光輝性を有する装飾性に優れた化粧板の製造方法に関する技術分野に属する。
【０００２】
【従来の技術】
従来より、この種の化粧板として、鉱物質繊維板や木質繊維板等からなる基板表面に凹凸模様を形成し、この表面に種々の塗装を施した化粧板はよく知られている。
【０００３】
また、上記塗装に用いる塗料中にパール調顔料、マイカ粉末、アルミ粉末、蛍光顔料等を合成樹脂液と共に混合することで、化粧板に光輝性を付与することも行われている。
【０００４】
【発明が解決しようとする課題】
このような光輝性を付与するパール調顔料等の光輝性物質は高価であるので、できるだけ少量で効果を現出させることが求められている。
【０００５】
しかし、基板表面に、光輝物質を含む塗料を塗布する場合、基板表面に凹凸模様が形成されていると、フラットな基板表面に比べ、その光輝効果は基板表面の凹凸によって減殺され、同じ光輝性物質の配合比の塗料を同量塗布しても、凹凸面の方の光輝効果がフラット面よりも低くなるという欠点がある。
【０００６】
また、光輝性を高めるために光輝顔料等の添加量を多くすると、塗膜にひび割れを生じる等、塗膜の耐久性が低下する虞れがある。
【０００７】
本発明は斯かる諸点に鑑みてなされたものであり、その目的とするところは、上記の如き光輝効果を持つ化粧板の製造方法を改良することで、その基板表面に凹凸模様が形成されていても、少量の光輝性物質で高い光輝効果が得られるようにすることにある。
【０００８】
【課題を解決するための手段】
上記目的の達成のため、この発明では、板状基材の表面の凹凸模様上に対し下地塗装後に施される上塗塗料に、化粧板に通常使用されるものよりも微粒でかつ粒径の異なる複数種類の無機質顔料を添加するとともに、その凹凸模様の凸部面のみに光輝顔料の添加されたクリア塗装を施すこととした。
【０００９】
すなわち、請求項１の発明では、まず、板状基材の表面に型押しにより凹凸模様を形成する。次に、その基材表面の凹凸模様の全面に下地塗装を施した後、平均粒径の異なる少なくとも２種類の微粒の無機質顔料を含む上塗り塗料を塗布し、次いで、上記凹凸模様の凸部面のみに光輝性物質の添加されたクリア塗料を塗布する。
【００１０】
斯かる構成により、上塗り塗料に含まれる無機質顔料の粒径が小さいので、この上塗り塗料の上から、光輝性物質の添加されたクリア塗料を塗布すると、光輝性物質に直接反射する光の他に、クリア塗膜層を透過した光も微粒の無機質顔料に均一に反射し、また反射率も高くなるので、効率的に光輝効果を発現させることができる。従って、基材表面に凹凸模様が形成されていても、クリア塗料中の光輝性物質の添加量を減らすことができる。
【００１１】
また、複数種類の無機質顔料の平均粒径が互いに異なっているので、大きい方の粒子間に小さい方の粒子が収まって結合されるようになり、凹凸表面の平滑性が向上して光輝物質の光輝効果をさらに高めることができる。
【００１２】
また、化粧板における基材表面の凹凸模様の凸部面のみに光輝性物質入りのクリア塗料が塗布されているので、この化粧板を天井板に使用した場合、正面から見ると上塗り塗料の落ち着いた色（通常は白等の淡色系）に見える一方、斜めから見ると、凹凸のある立体感と凸模様部のパール調等の光輝な反射光とが相俟って、高い装飾性の外観が現出する。
【００１３】
請求項２の発明では、上記板状基材は、繊維板の表面にペースト状の粘性のある塗材を厚塗り塗布したものとする。こうすると、ペースト状塗材の塗布層にも凹凸模様を形成できるので、より立体的な凹凸模様を形成することができる。
【００１４】
請求項３の発明では、上記上塗り塗料における微粒の無機質顔料は、平均粒径３０μ未満のクレーと、それよりも粒径の小さい炭酸カルシウムとからなるものとする。このことで、上塗り塗料の無機質顔料を具体的かつ容易に得ることができる。
【００１５】
【発明の実施の形態】
図１は本発明の実施形態に係る天井板用の化粧板Ａを示し、この化粧板Ａの製造方法では、まず、化粧板Ａとなる板状基材１の表面に加熱加圧による型押しにより所定の凹凸模様２を形成する。上記基材１は、型押しにより模様付けできるような材料、つまり鉱物質繊維板や木質繊維板等の繊維板が好適である。このような繊維板は、型押しによりその表面に凹凸模様２を形成し易いからであり、その他の天井板等に使用される合板、石膏ボード等は、型押しによる凹凸模様２の形成が難しいので好ましくない。
【００１６】
次いで、上記基材１表面の目止めを行う目的で、基材１表面の凹凸模様２の全面に亘り下地塗装を施して下地塗膜層４を形成する。この下地塗装は複数回行ってもよい。下地塗装に用いる塗料の一例として、例えば無機質顔料が４５〜６５重量部、酢酸ビニル等の合成樹脂バインダが１０〜２５重量部、水が１０〜２５重量部、それに分散剤や増粘剤等の添加剤を必要に応じて加えたものが使用される。塗布量は１回当たり１００〜２００ｇ／ｍ²程度が好ましい。
【００１７】
この後、上記基材１表面の凹凸模様２の全面に亘り、平均粒径の異なる２種類（３種類以上でもよい）の微粒の無機質顔料を含む上塗り塗料を塗布して上塗り塗膜層５を形成する。この上塗り塗料の無機質顔料は、通常この種の化粧板に使用されるものよりも粒径の細かなものを使用する。具体的には、例えば平均粒径が３０μ未満、好ましくは２０μ程度の平均粒径を持つクレーと、このクレーよりも粒径の小さくて平均粒径が２０μ未満、好ましくは１０μ程度（クレーの粒径の５０％程度）の粒径を持つ炭酸カルシウムとからなる微粒の無機質顔料を用いる。そのとき、クレーと炭酸カルシウムとの添加割合は、粒径の小さな炭酸カルシウムの方をクレーよりも多くするのがよい。上塗塗料の塗布量は１回当たり１００〜２００ｇ／ｍ²程度が好ましい。
【００１８】
次いで、上記凹凸模様２の凸部２ａ面のみに光輝性物質の添加されたクリア塗料（透明塗料）を塗布してクリア塗膜層７する。このクリア塗料は、例えば樹脂バインダを１５重量部、水を６０重量部、パール顔料を２０重量部としたものを用い、その塗布量は、パール顔料が例えば固形分換算で３．２ｇ／ｍ²となるように塗布する。尚、このパール顔料が固形分換算で１０ｇ／ｍ²以上となると、ひび割れ等が生じ易くなる。また、上記樹脂バインダの割合が多過ぎると、艶っぽくなって質感がプラスチック的になり自然感が減じる。クリア塗料の塗布には、ゴムロール等のロールコータを使用できる。
【００１９】
以上の工程により図２に示すような化粧板Ａが製造される。このようにして得られた化粧板Ａは、基材１表面の凹凸模様２の凸部２ａ面のみに光輝性物質入りの塗料が塗布されているので、この化粧板Ａを天井板に使用した場合、正面から見ると上塗り塗膜層５の落ち着いた色（通常は白等の淡色系）に見える一方、斜めから見ると、凹凸のある立体感と凸模様部のパール調等の光輝な反射光との相乗効果によって、高い装飾性の外観が得られる。
【００２０】
また、この実施形態では、上塗り塗料に含まれる無機質顔料の粒径が小さいので、この上塗り塗料の上から、光輝性物質の添加されたクリア塗料を塗布すると、直接光輝性物質に反射する光の他に、クリア塗膜層６を透過した光も微粒の無機質顔料に均一に反射する。しかも、反射率も高くなるので、光輝効果をさらに効率的に発現させることができる。従って、基材１表面に凹凸模様２が形成されていても、クリア塗料中の光輝性物質の添加量を減らすことができる。
【００２１】
また、上記２種類の無機質顔料（クレー及び炭酸カルシウム）の粒径が互いに異なっているため、大きい方のクレー粒子間に小さい方の炭酸カルシウムの粒子が収まって結合され、凹凸表面の平滑性が向上して光輝物質の光輝効果をさらに高めることができる。
【００２２】
尚、化粧板Ａの基材として、図３に示す如く、上記の如き繊維板の表面に、粘性のある塗材として未硬化状態のペースト状物３を厚塗り塗布したものを使用することもできる。このペースト状物３は、例えばアクリル系樹脂や酢酸ビニル系樹脂等の熱可塑性樹脂水溶液に、炭酸カルシウムやクレー等の無機質顔料を重量割合で３倍以上加えた粘性のあるものである。このようなペースト状物３は、５００ｇ／ｍ²以上の適度な厚さに厚塗りされる。この場合、繊維板表面のみならず、ペースト状物３の塗布層にも凹凸模様２を形成できるので、より立体的な凹凸模様２を形成できる利点がある。
【００２３】
また、上記実施例は、天井板用の化粧板Ａに適用した場合であるが、本発明はそれ以外の化粧板に対しても適用できるのはいうまでもない。
【００２４】
【実施例】
次に、具体的に実施した実施例について説明する。基材として、上記実施形態で説明したように、基材として繊維板表面に未硬化状態のペースト状物を厚塗り塗布したもの（図３参照）を使用し、この基材の表面に加熱加圧による型押しにより凹凸模様を形成した。この基材の表面全体に、上記実施形態の如き下地塗装を施した後、上塗り塗料を塗布し、次いで、上記凹凸模様の凸部面のみに光輝性物質の添加されたクリア塗料を塗布した。上記上塗り塗料の組成は表１のとおりであり、塗布量は１００〜２００ｇ／ｍ²であった。また、クリア塗料の組成や塗布量は上記実施形態の例と同じである。
【００２５】
【表１】

【００２６】
これに対し、比較例として、基材に対する上塗り塗装までの工程とトップクリア塗装工程とは上記実施例と同じで、上塗り塗料の組成のみを表２のように変えた。
【００２７】
【表２】

【００２８】
このようにして得られた実施例及び比較例の各化粧板を比較した結果、クリア塗料を薄く塗布した場合、比較例では光輝効果が不十分なものしか得られなかったのに対し、本発明実施例では、良好な光輝効果が得られ、よって本発明の効果が有効であることが判った。
【００２９】
また、クリア塗料のパール顔料を実施例の２倍以上に増やすと、光輝性は向上するが、ひび割れ等が生じ易くなり、塗膜の耐久性が不十分となることも裏付けられた。
【００３０】
【発明の効果】
以上説明したように、請求項１の発明によると、天井板等に用いられる化粧板を製造する場合、板状基材の表面に凹凸模様を形成し、その基材表面の凹凸模様の全面に下地塗装を施した後、平均粒径の異なる少なくとも２種類の微粒の無機質顔料を含む上塗り塗料を塗布し、次いで、上記凹凸模様の凸部面のみに光輝性物質の添加されたクリア塗料を塗布することにより、基材表面に凹凸模様が形成されていても、少量の光輝性物質で、かつ凹凸表面の平滑性を高めて化粧板表面の光輝効果を向上させることができ、その化粧板の外観装飾性の向上を図ることができる。
【００３１】
請求項２の発明によると、基材は、繊維板の表面にペースト状の粘性のある塗材を厚塗り塗布したものとしたことにより、ペースト状物の塗布層にも凹凸模様を形成して、より立体的な凹凸模様を形成できる。
【００３２】
請求項３の発明によると、上塗り塗料における微粒の無機質顔料は、平均粒径３０μ未満のクレーと、該クレーよりも粒径の小さい炭酸カルシウムとからなるものとしたことにより、上塗り塗料の無機質顔料を具体的かつ容易に得ることができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る天井板用の化粧板の要部拡大断面図である。
【図２】化粧板の平面図である。
【図３】化粧板の他の実施形態を示す図１相当図である。
【符号の説明】
Ａ化粧板
１基材
２凹凸模様
２ａ凸部
３ペースト状物
４下地塗膜層
５上塗り塗膜層
６クリア塗膜層[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field relating to a method for producing a decorative decorative board, particularly a decorative decorative board that is suitable for use as a ceiling panel and has excellent luster.
[0002]
[Prior art]
Conventionally, as this type of decorative board, a decorative board in which an uneven pattern is formed on the surface of a substrate made of a mineral fiber board, a wooden fiber board, or the like, and various coatings are applied to this surface is well known.
[0003]
In addition, a pearly pigment, mica powder, aluminum powder, fluorescent pigment, and the like are mixed with a synthetic resin liquid in the paint used for the above-described coating, thereby imparting glitter to the decorative board.
[0004]
[Problems to be solved by the invention]
Such brilliant materials such as pearlescent pigments imparting such brilliant properties are expensive, and therefore, it is required to bring out effects in as small a quantity as possible.
[0005]
However, when applying a paint containing a bright substance to the substrate surface, if the uneven surface pattern is formed on the substrate surface, the glitter effect is reduced by the unevenness of the substrate surface compared to the flat substrate surface, and the same glitter Even if the same amount of paint having a compounding ratio of substances is applied, there is a drawback that the glitter effect on the uneven surface becomes lower than that on the flat surface.
[0006]
Further, if the amount of the bright pigment or the like is increased in order to enhance the glitter, the durability of the coating film may be lowered, such as cracking of the coating film.
[0007]
The present invention has been made in view of such various points, and an object of the present invention is to improve the manufacturing method of the decorative board having the glitter effect as described above, so that an uneven pattern is formed on the substrate surface. However, a high glitter effect can be obtained with a small amount of glitter substance.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, the top coat paint applied after the base coating on the uneven pattern on the surface of the plate-like substrate is finer and has a different particle size than those usually used for decorative boards. While adding a plurality of types of inorganic pigments, only the convex surface of the concavo-convex pattern was subjected to clear coating to which a bright pigment was added.
[0009]
That is, in the first aspect of the present invention, first, an uneven pattern is formed on the surface of the plate-like substrate by embossing. Next, after applying a base coat to the entire surface of the concavo-convex pattern on the surface of the base material, a top coating containing at least two types of fine inorganic pigments having different average particle diameters is applied, and then the convex surface of the concavo-convex pattern Only apply clear paint with the addition of glittering substances.
[0010]
With such a configuration, since the particle size of the inorganic pigment contained in the top coat is small, when a clear paint to which a glittering substance is added is applied on the top coat, in addition to the light directly reflected on the glittering substance, The light transmitted through the clear coating layer is also uniformly reflected by the fine inorganic pigment and the reflectance is increased, so that the glitter effect can be efficiently expressed. Therefore, even if a concavo-convex pattern is formed on the substrate surface, the amount of the glittering substance in the clear paint can be reduced.
[0011]
In addition, since the average particle diameters of the plurality of types of inorganic pigments are different from each other, the smaller particles are accommodated and bonded between the larger particles, improving the smoothness of the uneven surface and improving the brightness of the glittering material. The glitter effect can be further enhanced.
[0012]
In addition, since a clear paint containing a glittering material is applied only to the convex surface of the concavo-convex pattern on the base material surface of the decorative board, when this decorative board is used for a ceiling board, the top coat paint settles when viewed from the front. When viewed from an oblique angle, the appearance of a highly decorative appearance is due to the combination of uneven three-dimensionality and brilliant reflected light such as pearl tone on the convex pattern. Appears.
[0013]
In the invention of claim 2, the plate-like substrate is obtained by thickly applying a paste-like viscous coating material on the surface of the fiberboard. In this way, since a concavo-convex pattern can also be formed in the coating layer of the paste-like coating material, a more three-dimensional concavo-convex pattern can be formed.
[0014]
In the invention of claim 3, the fine inorganic pigment in the top coat is composed of clay having an average particle size of less than 30 μm and calcium carbonate having a smaller particle size. By this, the inorganic pigment of top coat can be obtained concretely and easily.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a decorative board A for a ceiling board according to an embodiment of the present invention. In the manufacturing method of the decorative board A, first, the surface of a plate-like substrate 1 to be the decorative board A is embossed by heating and pressing. Thus, a predetermined uneven pattern 2 is formed. The base material 1 is preferably a material that can be patterned by embossing, that is, a fiberboard such as a mineral fiberboard or a wood fiberboard. This is because such a fiberboard can easily form the uneven pattern 2 on its surface by embossing, and it is difficult to form the uneven pattern 2 by embossing on plywood, gypsum board, etc. used for other ceiling boards and the like. Therefore, it is not preferable.
[0016]
Next, for the purpose of sealing the surface of the base material 1, the base coating layer 4 is formed by applying base coating over the entire surface of the uneven pattern 2 on the surface of the base material 1. This base coating may be performed a plurality of times. As an example of the paint used for the base coating, for example, 45 to 65 parts by weight of an inorganic pigment, 10 to 25 parts by weight of a synthetic resin binder such as vinyl acetate, 10 to 25 parts by weight of water, and a dispersant or a thickener What added the additive as needed is used. The coating amount is preferably about 100 to 200 g / m ² per one time.
[0017]
Thereafter, a top coating film containing two types (three or more types) of fine inorganic pigments having different average particle diameters is applied over the entire surface of the concavo-convex pattern 2 on the surface of the substrate 1 to form a top coating layer 5. Form. As the inorganic pigment for the top coat, those having a finer particle diameter than those usually used for this type of decorative board are used. Specifically, for example, a clay having an average particle size of less than 30 μm, preferably about 20 μm, and a particle size smaller than this clay and having an average particle size of less than 20 μm, preferably about 10 μm (clay particles A fine inorganic pigment made of calcium carbonate having a particle size of about 50% of the diameter) is used. At this time, the addition ratio of clay and calcium carbonate is preferably such that the amount of calcium carbonate having a smaller particle diameter is larger than that of clay. The coating amount of the top coating is preferably about 100 to 200 g / m ² per time.
[0018]
Next, a clear paint layer (transparent paint) to which a glittering substance is added is applied only to the convex portion 2 a surface of the concave-convex pattern 2 to form a clear coating layer 7. This clear paint uses, for example, 15 parts by weight of a resin binder, 60 parts by weight of water, and 20 parts by weight of pearl pigment. The coating amount of the pearl pigment is 3.2 g / m ^{2 in} terms of solid content, for example. Apply so that If this pearl pigment is 10 g / m ² or more in terms of solid content, cracks and the like are likely to occur. Moreover, when there are too many ratios of the said resin binder, it will become glossy and a texture will become plastic and a natural feeling will reduce. A roll coater such as a rubber roll can be used for applying the clear paint.
[0019]
The decorative board A as shown in FIG. 2 is manufactured by the above process. Since the decorative board A obtained in this way is coated with a paint containing a glittering substance only on the convex part 2a surface of the concavo-convex pattern 2 on the surface of the substrate 1, this decorative board A was used as a ceiling board. When viewed from the front, the top coat layer 5 appears to have a calm color (usually light-colored, such as white), but when viewed from the diagonal, it has a three-dimensional appearance with unevenness and a brilliant reflection such as the pearl tone of the convex pattern portion. Due to the synergistic effect with light, a highly decorative appearance can be obtained.
[0020]
In this embodiment, since the particle size of the inorganic pigment contained in the top coat is small, when a clear paint to which a glittering substance is added is applied from above the topcoat, the light reflected directly on the glittering substance is reflected. In addition, the light transmitted through the clear coating layer 6 is also uniformly reflected by the fine inorganic pigment. In addition, since the reflectance is increased, the glitter effect can be expressed more efficiently. Therefore, even if the uneven | corrugated pattern 2 is formed in the base material 1 surface, the addition amount of the glittering substance in a clear coating material can be reduced.
[0021]
In addition, since the two kinds of inorganic pigments (clay and calcium carbonate) have different particle sizes, the smaller calcium carbonate particles are contained and bonded between the larger clay particles, and the smoothness of the uneven surface is improved. This can improve the glitter effect of the glitter material.
[0022]
As the base material of the decorative board A, as shown in FIG. 3, the surface of the fiberboard as described above may be used by thickly applying an uncured paste 3 as a viscous coating material. it can. This paste-like product 3 has a viscosity in which an inorganic pigment such as calcium carbonate or clay is added three times or more by weight to an aqueous thermoplastic resin solution such as an acrylic resin or a vinyl acetate resin. Such a paste-like material 3 is thickly coated to an appropriate thickness of 500 g / m ² or more. In this case, since the uneven pattern 2 can be formed not only on the fiberboard surface but also on the coating layer of the paste-like product 3, there is an advantage that a more three-dimensional uneven pattern 2 can be formed.
[0023]
Moreover, although the said Example is a case where it applies to the decorative board A for ceiling boards, it cannot be overemphasized that this invention is applicable also to other decorative boards.
[0024]
【Example】
Next, specific examples will be described. As explained in the above embodiment, as the base material, the base material used is a fiberboard surface coated with an uncured paste (see FIG. 3), and the surface of the base material is heated. An uneven pattern was formed by embossing with pressure. After applying the base coating as in the above embodiment to the entire surface of the substrate, a top coating was applied, and then a clear coating to which a glittering substance was added was applied only to the convex surface of the concavo-convex pattern. The composition of the top coat was as shown in Table 1, and the coating amount was 100 to 200 g / m ² . Further, the composition and application amount of the clear paint are the same as those in the above embodiment.
[0025]
[Table 1]

[0026]
On the other hand, as a comparative example, the process up to the top coating on the substrate and the top clear coating process were the same as in the above example, and only the composition of the top coating was changed as shown in Table 2.
[0027]
[Table 2]

[0028]
As a result of comparing the decorative panels of Examples and Comparative Examples thus obtained, when the clear paint was applied thinly, the Comparative Example could only obtain an insufficient glitter effect, whereas the present invention In Examples, it was found that a good glitter effect was obtained, and therefore the effect of the present invention was effective.
[0029]
Further, it was confirmed that when the pearl pigment of the clear paint was increased to more than twice that of the example, the glitter was improved, but cracks and the like were easily generated, and the durability of the coating film was insufficient.
[0030]
【The invention's effect】
As described above, according to the first aspect of the present invention, when a decorative board used for a ceiling board or the like is manufactured, a concavo-convex pattern is formed on the surface of the plate-like substrate, and the concavo-convex pattern on the surface of the substrate is formed. After applying the base coating, apply a top coating containing at least two types of fine inorganic pigments with different average particle diameters, and then apply a clear coating with a glittering substance only on the convex surface of the concavo-convex pattern. By doing so, even if a concavo-convex pattern is formed on the substrate surface, it is possible to improve the glitter effect of the decorative board surface by increasing the smoothness of the concavo-convex surface with a small amount of brilliant substance. The appearance decoration can be improved.
[0031]
According to the invention of claim 2, the base material is formed by thickly applying a paste-like viscous coating material on the surface of the fiberboard, thereby forming a concavo-convex pattern on the paste-like material coating layer. A more three-dimensional uneven pattern can be formed.
[0032]
According to the invention of claim 3, the fine inorganic pigment in the top coat is composed of clay having an average particle size of less than 30 μm and calcium carbonate having a particle size smaller than that of the clay. Can be obtained specifically and easily.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part of a decorative panel for a ceiling panel according to an embodiment of the present invention.
FIG. 2 is a plan view of a decorative board.
FIG. 3 is a view corresponding to FIG. 1 and showing another embodiment of the decorative board.
[Explanation of symbols]
A decorative board 1 base material 2 uneven pattern 2a convex part 3 paste-like material 4 undercoat layer 5 top coat layer 6 clear coat layer

Claims

Form a concavo-convex pattern on the surface of the plate-shaped substrate by embossing,
After applying the base coating to the entire surface of the concavo-convex pattern, apply a top coating containing at least two types of fine inorganic pigments having different average particle diameters,
Then, the manufacturing method of the decorative board characterized by apply | coating the clear coating material to which the glittering substance was added only to the convex part surface of the said uneven | corrugated pattern.

In the manufacturing method of the decorative board of Claim 1,
A method for producing a decorative board, wherein the plate-like substrate is obtained by thickly applying a paste-like viscous coating material on the surface of a fiber board.

In the manufacturing method of the decorative board of Claim 1 or 2,
A method for producing a decorative board, characterized in that the fine inorganic pigment in the top coating composition comprises clay having an average particle size of less than 30 μm and calcium carbonate having a particle size smaller than that of the clay.