JP2005131934A - Manufacturing method of colored building panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a colored building panel having highly natural stone-like appearance. <P>SOLUTION: This manufacturing method of the colored building panel 10 comprises a process 1 for applying a mold release agent R to the surface of a template 1 having a negative uneven pattern NE, which corresponds to the uneven pattern PE on the surface of a building panel 10, formed to its mold surface 2 and forming a mold release agent sump RA to the recessed part NEA of the negative uneven pattern NE, a process 2 for scattering a coloring powder P1 over the whole surface of the building panel from above to form a coloring powder sump PA to the mold release agent sump RA of the recessed part NEA, a process 3 for scattering a raw material mixture, to which a coloring powder P2 based on a woody reinforcing material and a cementituous material and having a color different from that of the coloring powder P1 is internally added, over the coloring powder sump to form a mat M and a process 4 for compacting, ageing and curing the mat M. The building panel 10 manufactured by this method is finely changed in coloration corresponding to the surface uneven pattern PE to form the highly natural stone-like appearance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing a colored building board comprising a wood cement board.

BACKGROUND OF THE INVENTION
For example, as a building board used for an outer wall material or the like, a wood cement board in which a raw material mixture obtained by mixing a wood reinforcing material with a cement-based material is formed into a plate shape and cured and cured is often used. The surface of the building board is usually provided with a concavo-convex pattern, many of which are block-like patterns in which convex blocks surrounded by vertical and horizontal joint grooves are arranged vertically and horizontally. The block-like pattern is desired to have a natural stone-like appearance in which natural stone blocks are stacked as much as possible.

[Conventional technology]
Conventionally, as a building board having such a natural stone-like appearance, the first light-colored finish coating material slurry by coloring the aggregate is poured onto a mold board having a rock-like shade uneven pattern on the mold surface, and the concave part of the mold surface In the above, the thick convex portion is thinned, and then the second dark finish coating slurry by coloring the aggregate is poured from above so that the surface becomes flat, cured and cured, and thus formed. Architectural board A manufactured by demolding the board (see Patent Document 1), a mold release agent is attached to the mold surface of the mold having a shadow pattern on the mold surface, and the amount of the release agent applied is Sprinkle the pigment on the mold surface after leaving the convex part of the shaded uneven pattern more than the concave part, adhere more pigment to the part with higher unevenness, and absorb the pigment not adhered on the mold surface. After removing by blowing away, etc., pouring the plate material into the mold In the process of sucking and dewatering the building board B (see Patent Document 2), which is biocured and demolded in this way, the pigment dispersion water is sprayed on the surface of the paper mat. A fiber-reinforced cement board C manufactured by pressing and curing under pressure curing (see Patent Document 3), and covering the entire inorganic base plate having an uneven surface on the surface, the coloring powder An inorganic board D (see Patent Document 4) manufactured by scraping the body to leave the coloring powder only in the recesses, and curing and curing after supplying water to the base board is provided. ing.

In the building board A, the dark paint film underneath is observed through the light paint film on the surface, and it is said that a light color tendency part and a dark color tendency part are formed by the unevenness on the surface of the construction board, resulting in a deep shadow. In the building board B, the amount of coloring gradually decreases from the low part to the high part of the uneven pattern on the surface, so that the beauty of natural objects is exhibited. Furthermore, in the fiber reinforced cement C, if the amount of pigment dispersion water sprayed is changed to change the permeability of the base layer to the cement layer, it is said that the change of the pattern can be obtained as a marble tone or a blurred pattern. In the inorganic plate D, only the concave portions are colored, and the other portions are colored of the base plate, and the unevenness is emphasized.
Furthermore, in order to give a natural stone-like appearance, for example, in the case of a block-like pattern, a natural stone-like fine unevenness pattern is given to the upper surface of the convex block, and the joint material color in the joint groove (generally white or gray) As described above, coloring different from the coloring of the convex block surface is performed.

Japanese Patent Laid-Open No. 10-102723 Japanese Patent No. 2550260 JP-A-11-348017 JP 2001-138315 A

  However, in the above block tone pattern, in order to give the convex block surface a highly natural stone-like appearance, the fine irregularity pattern on the convex block surface is subtly colored or colored with varying colors, or particularly fine. Although it is necessary to perform a granular color change, it is difficult to give such a subtle coloration with the above-described conventional technology.

  In the present invention, as a means for solving the above-described conventional problems, the surface of the mold plate (1) formed on the mold surface (2) is formed with a shaded uneven pattern NE corresponding to the uneven pattern PE on the surface of the building board (10). A mold R is applied, and a step 1 for forming a release agent reservoir RA is formed in the concave portion NEA of the shade pattern NE, and a coloring powder P1 is sprayed over the entire surface to release the release agent for the concave portion NEA. Step 2 for forming the colored powder reservoir PA in the reservoir RA, and the raw material containing the wood powder reinforcing material and the cement-based material as the main components and the coloring powder P2 having a different color from the coloring powder P1. There is provided a method for producing a colored building board (10) comprising a step 3 of forming a mat M by spraying a mixture and a step 4 of curing and mating the mat M.

After applying the mold release agent R to the surface of the mold surface (2), it is desirable to make the mold plate (1) vibrate to facilitate the flow of the mold release agent R. It has a block-like pattern composed of a ground groove (11) and a convex block (12) surrounded by the joint groove (11), and the uneven pattern PE is a fine unevenness formed on the top surface of the convex block (12). Corresponding to this, the template (1) mold surface (2) is formed with joint grooves (11) forming convex portions (2B) and convex block (12) forming concave portions (2A). It is desirable that a fine shade pattern NE corresponding to the fine relief pattern PE formed on the upper surface of the convex block (12) is formed on the bottom surface of the convex block (12) forming concave portion (2A).
Further, the coloring powder P1 is spread over the entire surface of the mold release agent R coating layer of the mold surface (2) of the template (1), and then the joint groove (11) forming convex portion (11) of the mold surface (2) ( It is desirable to form the mat by scraping the coloring powder P1 adhering to the upper surface of 2B) and then spraying the raw material mixture. Further, when the coloring powder P1 adhering to the upper surface of the joint groove (11) forming convex portion (2B) of the mold surface (2) is scraped off, the coloring powder is applied by the adhesive force of the release agent R. It is desirable that P1 remain in a slight state, and the coloring powders P1 and P2 are preferably composed of an inorganic pigment, a hydraulic material, and an inorganic filler if desired.

  In general, the building board (10) has a three-layer structure in which the front and back layers have a dense structure and the core layer has a rough structure, and the raw material mixture is first sprayed with the raw material for the surface layer internally containing the coloring powder P2. The mixture is sprayed to form the surface mat, and then the core layer raw material mixture is sprayed to form the core layer mat, and the back layer raw material mixture is further sprayed to form the back layer mat. The three-layer mat M is manufactured by pressing and curing.

[Action]
A release agent reservoir RA is formed in the concave portion NEA of the shadow pattern NE of the mold surface (2) of the template (1), and a large amount of the coloring powder P1 is accumulated in the release agent reservoir RA. Powder reservoir PA is formed, and there is little adhesion of mold release agent R to the projection NEB of the shade pattern NE of the mold surface (2) of the template (1). In the coloring powder P1 adhering to the concave portion NEA, when the inorganic pigment in the powder P1 is well dispersed and exposed and transferred to the plate (10), the convex portion PEA of the concave-convex pattern PE The pigment color is strongly developed, and the concave PEB is weakly colored. The state of accumulation of the release agent R varies slightly depending on the depth of the recess NEA of the shade pattern NE of the template (1) and the mold surface (2) or the viscosity of the release agent R. Accordingly, when the image is transferred to the plate (10), the convex portion tends to be deeply colored or concave depending on the subtle pattern change of the convex PEA and concave PEB of the concave and convex pattern PE on the surface of the plate (10). The part is colored slightly differently and slightly colored, and the base coloration due to the different colored powder P2 mixed in the raw material mixture is weak in the convex PEA from the above surface coloring, and strongly visible or exposed in the concave PEB. In combination with the surface coloring, an advanced and elegant natural stone-like appearance is imparted.
Template (1) After applying the release agent R to the mold surface (2) and then applying vibration to the template (1), the applied release agent R flows well.

  When the surface pattern of the building board (10) is a block-like pattern composed of vertical and horizontal joint grooves (11) and convex blocks (12) surrounded by the joint grooves (11), the convex blocks (12) A natural stone-like fine uneven pattern PE is attached to the surface, and the inside of the joint groove (11) is almost a base color, and such a convex block (12) with an advanced natural stone-like appearance passes through the joint groove (11). It looks like a natural stone block wall piled up.

  When manufacturing a building board (10) having the above block-like pattern, a convex block (12) forming concave part (2A) and a joint groove (11) forming convex part (2) on the mold surface (2) of the template (1) ( 2B), and a fine concavo-convex pattern NE is attached to the bottom surface of the convex block (12) forming concave portion (2A). In the manufacturing method of a building board (10) using the above-mentioned template (1), the coloring powder P1 is spread over the entire surface of the release agent R coating layer of the mold surface (2) of the template (1). Then, after scraping off the coloring powder P1 adhering to the upper surface of the joint groove (11) forming convex part (2B) of the mold surface (2), spraying the raw material mixture and forming the mat M, the building board In the concavo-convex pattern on the surface of (10), the coloring powder P1 is adhered and fixed to the convex block (12), and the coloring powder P1 is not adhered and fixed to the joint groove (11). Is given the color of the powder P1 for coloring, and the joint groove (11) becomes the ground color of the surface layer of the building board (10).

  When the coloring powder P1 adhering to the upper surface of the convex part (2B) of the mold surface (2) is scraped off, the coloring powder P1 remains slightly due to the adhesive force of the release agent R. In the block-like pattern on the surface of the building board (10), the coloring powder P1 is adhered and fixed to the convex block (12) to give the coloring powder P1 color, and the bottom of the joint groove (11) Since a slight amount of coloring powder P1 remaining is adhered and fixed, the ground color of the surface layer of the building board (10) is seen through under the color of the coloring powder P1.

  When the powder for coloring P1 for spraying is composed of an inorganic pigment, a hydraulic material, and an inorganic filler, formation of nodules during storage of the powder for coloring P1 is prevented by the inorganic filler, and the powder P1 Dispersion in the release agent R and pigment exposure are performed smoothly. Further, since the hydraulic material in the powder P1 is cured together with the curing of the plate (10), the surface of the plate (10) can be colored firmly. Further, the color density can be adjusted by the amount of the inorganic filler added. An inorganic filler may also be added to the internally added coloring powder P2.

〔effect〕
In the present invention, a building board having a highly natural stone-like appearance can be provided, whereby the building board can be colored slightly changing according to the uneven pattern on the surface.

The present invention is described in detail below.
[Cement-based materials]
The cementitious material used in the present invention is a hydraulic material mainly composed of calcium silicate. 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 Further, there are silica cement, alumina cement, etc. mixed with silica materials such as volcanic ash and white clay.

[Silica-containing material]
In the present invention, it is desirable to add a silicic acid-containing material in order to accelerate the curing reaction of the cementitious material. Examples of the silicic acid-containing material include silica powder, silica sand, silica stone powder, water glass, silica fume, shirasu balloon, perlite, mica, diatomaceous earth, and dolomite.

[Wood reinforcement]
As the wood reinforcing material used in the present invention, for example, a piece of wood, a wood fiber bundle, or wood powder is used. The wood pieces preferably have a width of 0.5 to 2.0 mm, a length of 1 to 20 mm, and an aspect ratio (length / thickness) of 20 to 30, and the wood fiber bundle has an average diameter of 0.1 to 2 It is desirable to have a branch and / or curved and / or bent of 0.0 mm and a length of 2 to 35 mm. As the wood powder, it is preferable to use one having a mesh size of 0.1 to 1.5 mm. These pieces of wood, wood fiber bundles and wood powder may be used in combination. Since a layer using a fine wood material such as wood powder becomes dense, it shows high strength against compressive stress. The dense layer is preferably a front and back layer of a wood cement board, whereby the wood cement board is excellent in surface smoothness, and when forming an uneven pattern on the surface of the wood cement board, The uneven pattern is sharply formed. In addition, the wood fiber bundle is bulky and contributes to weight reduction of the molded body, has a cushioning property, and is excellent in moldability when an uneven pattern is applied to the surface.
In the present invention, a material recycled from wood scrap can be used as a wood reinforcing material other than the above. Examples of the wood scrap include old wood generated when demolishing a wooden building, sawdust and scraps generated from the lumbering process, veneer lace scraps generated from the plywood manufacturing process, thinned wood of conifers, wood cement board There are scraps and scraps.

[Third component]
Other than the cement-based material and the wood reinforcing material, in the present invention, for example, fibers such as bamboo fiber, hemp fiber, bacus, rice straw, rice straw, aluminum sulfate, magnesium sulfate, calcium sulfate, polyaluminum chloride, aluminate Curing accelerators such as salts and water glass, waxes, waxes, paraffins, surfactants, waterproofing agents and water repellents such as silicon, bitumens such as asphalt, pitch and coal tar, acrylic resins, polyethylene, ethylene-vinyl acetate A synthetic resin such as a copolymer or petroleum resin, a natural resin such as rosin, ester gum, dammar gum, or copal, or a wood material surface covering agent of a thermoplastic material such as a modified natural resin may be added.

[Powder for coloring]
There are inorganic and organic powders for coloring, but they are inorganic in view of their compatibility with the wood cement board surface and the fact that the color tone of the slab board does not fade, and the color tone does not change over a long period of time. The system type is preferred. Examples of the inorganic powder include titanium white, bengara (iron oxide), cobalt blue, and chrome yellow. Two or more of these coloring powders may be mixed.

[Hydraulic material]
The coloring powder is preferably mixed with a hydraulic material. Examples of the hydraulic material include the cement-based material, gypsum, magnesium carbonate, calcium oxide, calcium hydroxide, magnesium oxide, magnesium hydroxide, silica, and the like. Two or more of these hydraulic materials may be mixed. The hydraulic material is usually added in an amount of 5 to 15% by mass with respect to the coloring powder.

[Inorganic filler]
Furthermore, in the present invention, it is preferable to add an inorganic filler to the coloring powder. Examples of the inorganic filler include calcium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, aluminum hydroxide, zinc oxide, alumina, talc, clay, asbestos, glass fiber, carbon fiber, calcium silicate, bentonite, white Examples thereof include carbon, carbon black, iron powder, aluminum powder, stone powder, and zirconia powder. Two or more inorganic fillers may be mixed. The inorganic filler is usually added in an amount of 40 to 60% by mass with respect to the coloring powder.

〔Release agent〕
In the present invention, the mixture of the above raw materials is sprayed on the template and the mat is formed and pressed and cured, but after the press and cure, the mold is separated from the template surface in order to smoothly release the plate. Apply mold. As such a release agent, generally used release agents such as silicon-based, fluorine-based, mineral oil-based, and higher fatty acid metal salt-based materials are used, but in order to facilitate formation of the release agent reservoir. For this, it is preferable to use a release agent having a low viscosity such as silicon, fluorine, or mineral oil.

[Preparation of raw material mixture]
In the present invention, the mixing ratio of the raw material mixture is usually 30 to 60% by mass of cement-based material, 30 to 60% by mass of silicic acid-containing material, 5 to 25% by mass of wood reinforcing material (wood flour + wood piece), aluminum sulfate 0.5 to 5% by mass and coloring powder 1 to 3% by mass.

[Manufacturing method of building board]
In the present invention, a building board is manufactured by a dry method or a semi-dry method in which a raw material mixture is sprayed on a template to form a mat, and compression and curing are cured in the presence of moisture. In the dry method, water is not added to the raw material mixture, and water is supplied to the mat during compression biocure. In the semi-dry method, the water content is usually 30 to 45% by mass in the raw material mixture. Add approximately.
The dry method and semi-dry method are very suitable for continuous mass production of building boards.

In the present invention, as shown in FIG. 1, first, a shade irregular pattern NE corresponding to the irregular pattern on the surface of the building board is formed on the mold surface (2) of the template (1), and the mold release agent R is applied to the mold surface (2). Apply (step 1). In the building board (10) having a block-like pattern, a convex block forming concave part (2A) and a joint groove forming convex part (2B) are formed on the mold surface (2) of the template (1). The shadow pattern NE of the mold surface (2) is formed as a fine uneven pattern in the convex block forming concave part (2A). In this case, the release agent R tends to flow toward the concave portion NEA of the shadow pattern NE on the mold surface (2) of the mold plate (1) and form a release agent reservoir RA there. In this case, when the template (1) is electromagnetically or mechanically vibrated, the release agent R tends to flow toward the concave portion NEA, and in this case, it is not always necessary to use a low-viscosity release agent. . Furthermore, in order to improve the fluidity of the release agent R, the release agent R may be heated to lower the viscosity before application, at the time of application, or after application. The coloring powder P1 is sprayed over the entire surface (step 2). The coloring powder P1 is usually sprayed using an electric sieve. The amount of spraying is arbitrary, and when it is colored darkly, the amount of spraying is increased, and when it is desired to be colored lightly, the amount of spraying is decreased. Usually sprayed amount is set to 50g / m ² ~150g / m ² approximately.

  When the powder P1 for coloring is spread on the mold surface (2) in this way, the powder P1 adheres to the mold surface (2) due to the viscosity of the mold release agent R. However, as shown in FIG. In the mold reservoir RA, the adhesion amount of the powder P1 increases, and the powder reservoir PA is formed. In the powder reservoir PA, that is, the release agent reservoir RA, the amount of the release agent R is large, and the powder P1 is well dispersed therein and the pigment is exposed.

  As described above, the coloring powder P1 is sprayed on the release agent R coating layer of the template (1) and the mold surface (2). However, the formation of joint grooves on the template (1) and mold surface (2) is performed. The coloring powder P1 on the upper surface of the convex portion (2B) may be scraped off. In order to scrape the coloring powder P1, as shown in FIG. 3, a rubber wiper (3) or roll, or a wooden or metal wiper or roll with a cloth or rubber attached to the scraping portion is used. When the highly viscous higher fatty acid metal salt release agent R is applied to the mold plate (1) and the mold surface (2), the coloring powder P1 on the upper surface of the convex portion (2B) is scraped off. The coloring powder P1 slightly remains on the upper surface.

On the mold plate (1) in this state, a raw material mixture in which coloring powder P2 different in color from the coloring powder P1 dispersed on the mold surface (2) is dispersed is dispersed to form a mat M as shown in FIG. Forming is performed (step 3). The mat M thus formed is pressed and cured.
The compression curing and curing conditions are usually a pressing pressure of 10 to 30 kg / cm ² , a temperature of 50 to 80 ° C., and a time of about 8 to 30 hours, and heating is usually performed with steam. The pressing is performed by pressing the multilayer mat between the two mold plates (1).

The building board (10) molded in this way has a concavo-convex pattern PE on the surface and is colored by the powder P1 for coloring, but in a block tone pattern as shown in FIG. A plurality of convex blocks (12) surrounded by vertical and horizontal joint grooves (11) are arranged vertically and horizontally, and as shown in FIG. 6, the surface of the convex block (12) is composed of convex portions PEA and concave portions PEB. Fine concavo-convex pattern PE is given.
Since the portion of the powder reservoir PA is the convex portion PEA of the fine concavo-convex pattern PE on the upper surface of the convex block (12), the convex portion PEA of the fine concavo-convex pattern PE is colored strongly based on the coloring powder P1. In addition, the joint grooves (11) are hardly colored based on the coloring powder P1, and the base color is still remarkable. The intensity of coloring varies slightly depending on the pattern of the concavo-convex pattern PE.

In the present invention, the front and back layers of the building board (10) may have a dense structure, and the core layer may have a three-layer structure having a coarse structure. In order to produce such a three-layer building board (10), the raw material mixture having the above composition is used as the raw material mixture for the front and back layers, and the powder P2 for coloring is internally added to the raw material mixture for the back layer. It does not have to be. As a raw material mixture for a core layer, cement-based material 30 to 60% by mass, silicic acid-containing material 30 to 60% by mass, wood reinforcing material (wood fiber bundle + wood piece) 5 to 25% by mass, polystyrene pre-expanded beads 0.5 -5 mass% and aluminum sulfate 0.5-5 mass% are used.
Then, the surface layer raw material mixture is sprayed on the template (1) to form the surface mat, then the core layer raw material mixture is sprayed thereon to form the core layer mat, and the back layer raw material is further formed thereon. The back layer mat is formed by spraying the mixture, and the resulting three-layer mat M is cured in the same manner by pressing and curing.

  In the three-layer building board (10), since the surface is dense, the concavo-convex pattern PE becomes clear and the coloring powder P1 adheres firmly. In addition, since the core layer has a rough structure, the core layer is lightweight and has cushioning properties, so that the surface is clearly provided with an uneven pattern.

An example of the formulation of the raw material mixture is shown below.
Portland cement 45 parts by weight silica sand 30 〃
Perlite 10 〃
Wood chip
Wood flour 5 〃
Aluminum sulfate 3 〃
* Powder for coloring P2 2 〃
* Powder for coloring P2: Titanium white: Bengala = 75: 25 mixture in which 10% by mass of slaked lime or cement-based material is added

The raw material mixture is sprayed on the template (1) to form the mat. The coloring powder P1 is sprayed on the mold surface (2) of the template (1), and the coloring powder P1 The coloring powder P2 internally added to the raw material mixture is different in color and has the following composition.
Powder P1 for coloring; mixture of 45% by mass of bengara: cobalt blue = 80: 20% by mass, 5% by mass of slaked lime or cement-based material, and 50% by mass of calcium carbonate

In this example, a mat (mat thickness 40 mm) M was made by a semi-dry method in which about 40% by mass of water was added to the raw material mixture, and the mat M was pressed and cured to form and harden a cement plate having a thickness of 12 mm. .
The mat M was subjected to pressing curing conditions of a pressing pressure of 30 kg / cm ² , a temperature of 65 ° C., and a time of about 20 hours, and heating was performed with steam. The pressing was performed by pressing the multilayer mat between two mold plates (1).

The mat M is cured during the compression curing process, and the surface is provided with a corresponding uneven pattern PE by the shaded uneven pattern NE of the mold surface (2) of the template (1). Template (1) The coloring powder P1 dispersed on the mold surface (2) is adhered and fixed.
In the building board (10) manufactured in this way, the convexity PEA of the concavo-convex pattern PE on the surface of the convex block (12) is 100% colored based on the pigment of the coloring powder P1 dispersed. When the surface was observed with a magnifying microscope, it was confirmed that the entire surface was colored with the pigment within an area of 1 mm ² . Further, in the concave PEB of the concave-convex pattern PE on the surface of the convex block (12), the coloration becomes weaker as it becomes deeper, and the coloring by the dispersed pigment and the base material color are mixed within an area of 1 mm ^2. The coloration based on the pigment of the dispersed coloring powder P1 was found to be about 50%, and the coloration based on the pigment was about 10% in the deepest concave portion.

  In the building board of the present invention, the shade of color and the color are slightly changed corresponding to the uneven pattern on the surface, so that it has an advanced natural stone appearance and has a very high commercial value.

1 to 6 show an embodiment of the present invention.
Forming explanatory drawing of mold release agent reservoir by applying mold release agent to mold surface Powder reservoir formation state explanatory diagram Powder scraping state explanatory diagram Mat formation state explanatory diagram Partial perspective view of building board Partial enlarged sectional view of building board

Explanation of symbols

1 Template
2 Mold surface
2A (Template) Convex block forming recess
2B (Stencil) Joint groove forming convex part NE (Stencil) Fine shade uneven pattern NEA (Stencil) Concave part of fine shade irregular pattern R Release agent RA Release agent reservoir P1, P2 Coloring powder PA Coloring powder Body pool
10 Building board
11 (Building board) Joint groove
12 (Building board) Convex block PE (Building board) Concavity and convexity PEA (Construction board) Concavity and convexity convex part PEB (Construction board) Concavity and convexity concave part M Matte

Claims (8)

  Step 1 of applying a release agent to the surface of the mold plate on which the shade pattern corresponding to the uneven pattern on the surface of the building board is formed, and forming a release agent reservoir in the recess of the shade pattern The coloring powder is sprayed on the entire surface to form a coloring powder reservoir in the release agent reservoir in the recess, and the coloring powder is mainly composed of a wood reinforcing material and a cement-based material. A method for producing a colored building board, comprising: a step 3 of forming a mat by spraying a raw material mixture containing a coloring powder different in color from a body; and a step 4 of curing the mat by pressing and curing.   The manufacturing method of the colored building board of Claim 1 which applies a mold release agent to the surface of a mold surface, and applies a vibration to a template and makes the flow of a mold release agent easy.   The building board has a block-like pattern composed of vertical and horizontal joint grooves and a convex block surrounded by the joint grooves, and the uneven pattern is a fine uneven pattern formed on the upper surface of the convex block. Then, a joint groove forming convex portion and a convex block forming concave portion are formed on the template surface, and a fine pattern corresponding to the fine concave and convex pattern formed on the upper surface of the convex block is formed on the bottom surface of the convex block forming concave portion. The manufacturing method of the colored building board of Claim 1 or 2 in which the shade uneven | corrugated pattern is formed.   After the coloring powder is completely sprayed on the release agent coating layer on the mold surface of the template, the coloring powder adhering to the upper surface of the joint groove forming convex portion of the mold surface is scraped off The manufacturing method of the colored building board of Claims 1-3 which sprays a raw material mixture and forms a mat | matte.   5. When the coloring powder adhering to the upper surface of the joint groove forming convex portion of the mold surface is scraped off, the coloring powder is in a state of remaining slightly due to the adhesive force of the release agent. The manufacturing method of the colored building board as described in 2.   The method for producing a colored building board according to claim 1, wherein the powder for coloring comprises an inorganic pigment and a hydraulic material.   The method for producing a colored building board according to claim 1, wherein the powder for coloring comprises an inorganic pigment, a hydraulic material, and an inorganic filler.   The building board has a three-layer structure in which the front and back layers have a dense structure and the core layer has a rough structure. Forming the surface layer mat, then spraying the core layer raw material mixture to form the core layer mat, spraying the back layer raw material mixture to form the back layer mat, and the three-layer mat thus obtained The manufacturing method of the colored building board of Claims 1-7 which harden | cure is pressed and cured.

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