JPH0474065B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a construction board expressing the appearance of natural stone, and more particularly to a method for forming a surface pattern of natural stone, particularly granite pattern.

[Prior Art] In recent years, natural stone has been used as a building material due to its luxurious appearance.

[Problems to be Solved by the Invention] However, when natural stone is used as a building material, it has disadvantages such as being expensive, heavy, easily broken, and difficult to construct. For this reason, the most widely used method for obtaining architectural boards with natural stone patterns is to print on the surface of the base material, but it has the following drawbacks.

Plate making and printing require time and expense.

There is no variation in the pattern seen with natural stone, and only a uniform pattern can be expressed (only the same pattern is printed).

If you want to vary the pattern, you will need many plates.

Larger sizes are not possible because only the size of the plate can be produced.

Materials with unevenness (embossed) on the base material cannot be used.

In order to eliminate these drawbacks of printed printing boards, in recent years, natural stone patterns have been expressed by painting. As a painting method, spraying paint with a spray gun and applying a pattern (pattern) is widely used, but it has the following drawbacks.

It has the disadvantage that dust adheres to the surface and air bubbles remain in the coating film, resulting in a poor appearance of the surface.

Even if a top coat of clear paint is applied after a pattern is formed on a flat base material, the unevenness of the handle creates minute irregularities on the top coat surface of the clear paint, making it impossible to obtain the appearance of a polished surface of natural stone.

The depth of the pattern cannot be expressed (it is not possible to express sharp patterns and blurred patterns).The present invention has been made in view of the above points, and the purpose of the present invention is to use it for interior and exterior. To provide a method for producing a building board, which can obtain a building board having a natural stone pattern, especially a granite pattern, and which has a deep pattern.

[Means for Solving the Problems] In order to achieve the above object, the method for manufacturing a construction board of the present invention includes applying a base coat 2 of a concealing paint on a substrate 1 having a smooth surface, and then applying a base coat 2 of a concealing paint to a substrate 1 having a smooth surface. is applied in spots to form the first pattern coat 3a, and with the first pattern coat 3a formed, the first pattern coat 3a is applied.
A second pattern coat 3b is formed by applying a paint with low hiding power in spots over the pattern coat 3a, and after applying the pattern coat 3 of the first pattern coat 3a and the second pattern coat 3b, the pattern coat 3 is applied. This method is characterized in that the thickness of the pattern coat 3 is varied by polishing, and a top coat 4 of clear paint is applied on top of the pattern coat 3.

[Function] Base coat 2, first pattern coat 3a, on base material 1.
By sequentially applying the second pattern coat 3b, polishing the pattern coat 3, and then applying the top coat 5, it is possible to obtain an architectural board with a non-uniform natural stone pattern, especially a granite pattern, and the pattern has depth. You can get building boards.

[Example] The substrate 1 has a smooth surface and is made of a calcium silicate board, an asbestos cement board, a gypsum slag board, a gypsum board, an FRP board, a plywood board, a wood board, or the like. A base coat 2 is formed on the surface of the substrate 1 using a concealing paint to form a coating film of the same color as the natural stone to be expressed. As a coating method for applying the base coat 2, roll coater, flow coater, spray coating, etc. may be used alone or in combination. The material for the base coat 2 is, for example, urethane enamel paint. Next, a concealing paint is applied in spots on this base coat 2 to form a first pattern coat 3a.
is formed. This first pattern coat 3a has the effect of completely hiding the base coat 2 in the thick part of the coated part, and causing the color of the base coat 2 to remain and change the color in the thin part of the coat. A urethane-based enamel paint is used as the paint for this first pattern coat 3a. After the first pattern coat 3a is applied, a second pattern coat 3b is applied on the base coat 2 by applying a color paint with low hiding power in spots. This second pattern coat 3b has the effect of expressing a subtle color change due to the difference in film thickness of the coated portion. The paint used for the second pattern coat 3b includes color clear paint (clear paint colored) and the like. Furthermore, since the second pattern coat 3b is applied on top of the first pattern coat 3a, the color change becomes even more effective. Also, the first pattern coat 3a, the second pattern coat 3a,
Since both pattern coats 3b are applied multiple times during painting, the overlapping parts are more random and more subtle colors can be expressed. Many colors are subtly mixed in the natural stone pattern, and the first pattern coat 3a and the second pattern are
The more colors there are in the pattern coat 3, such as the pattern coat 3b, the better the reproducibility will be, but if there are too many colors, the number of coats will increase and problems will occur, such as difficulty in pattern reproducibility. The color is appropriate. Another feature of the present invention is that a subtle pattern (color) can be expressed with a small number of patterned coats 3. Match the color of pattern coat 3 to the same color as the natural stone. After applying the pattern coat 3 such as the first pattern coat 3a and the second pattern coat 3b on the base coat 2 in this way, the surface of the pattern coat 3 is polished as shown in Fig. 2, and the pattern is further given a subtle color. You can create changes and blur effects. In other words, the first pattern coat 3a
There is an overlapping area between the spray painting and the second pattern coat 3b, and by scraping that area, a part A where the pattern sticks out and a blurred part B (blurring effect) are created, and the depth (shallow part) of the pattern of natural stone is created. It is possible to express the pattern (the pattern in the deep part is clearly visible in the shallow part, and it is blurred in the deep part). After polishing Pattern Coat 3, clear paint is applied on top of Pattern Coat 3 to bring out the depth of natural stone, and Top Coat 4 is applied.
form. In other words, the deep transparency of natural stone cannot be expressed with only the pattern coat 3, and by applying the top coat 4 of clear paint to the pattern coat, it is possible to express a sense of depth. The clear paint to which the top coat 4 is applied is, for example, a urethane-based clear paint. In order to effectively create depth, it is more effective to increase the thickness of the top coat 4 of clear paint, and the clear paint may be applied multiple times. Further, if the surface of the top coat 4 is polished to eliminate foreign matter, air bubbles, and minute irregularities on the surface, a deeper impression will be obtained.

[Effects of the Invention] As described above, the present invention applies a base coat of a concealing paint to a substrate with a smooth surface, and then applies the concealing paint in spots to form a first pattern coat. The first coat is formed with one pattern coat.
A low-concealing paint is applied in spots over the pattern coat to form a second pattern coat, and a top coat of clear paint is formed on top of this.
Printing is not uniform, which cannot be expressed with the printing method (moderate variations occur due to the pattern coating,
All of them have slightly different patterns.) Natural stone, especially architectural boards that express granite patterns, can be obtained by applying a second pattern coat of paint with low hiding properties on top of the first pattern coat. In order to apply
The result is a construction board that expresses even more subtle color changes, and since the first and second pattern coats are polished, it is possible to make the pattern stand out or change the pattern. By blurring the pattern, it is possible to give the pattern more depth and make it look more like natural stone.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a construction board obtained by the method for manufacturing a construction board of the present invention, and FIG. 2 is a cross-sectional view showing the same pattern coat after being polished. 1 is a substrate; 2 is a base coat, 3 is a patterned coat,
3a is a first pattern coat, 3b is a second pattern coat, and 4 is a top coat.

Claims (1)

[Claims] 1 Apply a base coat of a concealing paint on a substrate with a smooth surface, then apply the concealing paint in spots to form a first pattern coat;
With the pattern coat formed, paint with low concealment properties is applied in spots over the first pattern coat, and a second pattern coat is applied.
After forming a pattern coat and applying the first pattern coat and the second pattern coat, the pattern coat is polished to change the thickness of the pattern coat, and a top coat of clear paint is formed on the pattern coat. A method for manufacturing a construction board characterized by: