JP2685913B2 - Manufacturing method of building board - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a building board that expresses the appearance of natural stone, and more particularly to a method for forming a surface pattern of natural stone, especially granite stone.

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

However, when natural stone is used as a building material, it has drawbacks such as high cost, heavy weight, easy cracking, and difficult construction. Therefore, as a method for obtaining a building plate having a natural stone pattern, the method of printing on the surface of the base material is most widely used, but it has the following drawbacks.

 Platemaking and printing take time and money.

There is no change in the pattern found in natural stones, and only standardized patterns can be expressed (only the same pattern made by plate making).

 If you want to change the design, you need many editions.

Large size is not possible because only plate-making size is possible.

 A substrate having irregularities (emboss) cannot be used.

In order to solve this problem, the applicant of the present patent application has previously filed Japanese Patent Application No. 63-177305, Japanese Patent Application No. 63-177306, and Japanese Utility Model Application No. 1-2050.
No. 5, Japanese Patent Application No. 1-51525, Japanese Patent Application No. 1-51526, etc. In such a structure, a base coat is applied to the surface of the substrate, a pattern coat is applied on the base coat, and a top coat such as color clear paint is applied on the pattern coat to form a building board.

[Problems to be Solved by the Invention] Although the above-mentioned problems can be solved by printing, the following problems occur. In other words, in order to express the texture of natural stone and artificial stone, the surface is polished to obtain a mirror surface. In addition, color clear paint is used for the top coat to create depth,
When the top coat of color clear paint is mirror-finished, even if the coating amount (thickness of top coat of color clear paint) is constant, the amount of polishing during polishing will vary, and the thickness of top coat of color clear paint will be It has a drawback that it changes and causes a difference in color in the surface appearance.

The present invention has been made in view of the above-mentioned points, and the object of the present invention is to provide a natural clear stone, and even if the surface is abraded using a color clear paint for the top coat in order to express the artificial stone. It is an object of the present invention to provide a method for manufacturing a building board capable of preventing a color difference on the surface due to variations in the thickness of the top coat of paint.

[Means for Solving the Problems] In the method for manufacturing a building board according to the present invention for achieving the above object, a base coat 2 of a paint having a concealing property is applied on a substrate 1, and then a pattern pattern is formed on the base coat 2. A coat 3 is formed, a first top coat 4 of a color clear paint is formed on the pattern coat 3 over substantially the entire surface of the base coat 2, and a second top coat of a colorless clear paint is formed on the first top coat 4. 5 is formed, and the surface of the second top coat 5 is polished to be mirror-finished.

[Function] By forming the second top coat 5 of the colorless clear paint on the first top coat 4 of the color clear paint and polishing the surface of the second top coat 5, the first top coat 4 of the color clear paint is formed. The surface can be mirror-finished without changing the thickness, and color difference due to variations in the thickness of the layer of color clear paint can be prevented.

[Example] The substrate 1 has a smooth surface, and as the material thereof, a calcium silicate plate, an asbestos cement plate, a gypsum slag plate, a gypsum board, an FRP plate, a plywood, a wood plate, or the like is used. A base coat 2 is formed on the surface of the substrate 1 so as to form a coating film of the same color as the natural stone expressed by using a paint having a concealing property. As a coating method for coating the base coat 2, there are a roll coater, a flow coater, spray coating and the like, either alone or in combination. Examples of the material of the paint of the base coat 2 include urethane enamel paint. Next, a paint having a concealing property is applied onto the base coat 2 so as to form a pattern, thereby forming a pattern coat 3. Urethane-based enamel paint is used as the paint for forming the pattern coat 3. After applying the pattern coat 3 on the base coat 2 in this way, a color clear paint is applied on the pattern coat 3 to form the first top coat 4 in order to bring out the depth of natural stone. A second clear top coat 5 is formed by applying a colorless clear paint to the above. In other words, the pattern coat 3 alone cannot express the deep transparency of natural stone, and the effect of expressing a feeling of depth by applying the first top coat 4 of color clear paint or the second top coat 5 of colorless clear paint to the pattern coat 3 Have. The clear paint for applying the first top coat 4 and the second top coat 5 is, for example, a urethane clear paint. By the way, when the first top coat 4 or the second top coat 5 is applied, foreign matter adheres to the surface or air bubbles are mixed in during the coating, and a good appearance cannot be obtained only by coating. As a result, there is a problem that minute irregularities are formed on the surface of the second top coat 5 and a smooth surface obtained by polishing natural stone cannot be obtained. In order to solve this problem, the surface of the second top coat 5 is polished to finish the surface of the second top coat 5 to be smooth, so that the feeling of depth can be improved. It is more effective to increase the thickness of the first top coat 4 and the second top coat 5 to effectively increase the depth, and the clear paint may be applied a plurality of times. Further, since the second top coat 5 of the colorless clear paint is used for polishing the surface, the thickness of the first top coat 4 of the color clear paint does not change and the color difference on the surface can be prevented.

[Effect of the invention] As described above, the present invention applies a base coat of a paint having a concealing property onto a substrate, forms a pattern coat having a pattern on the base coat, and covers the pattern coat over substantially the entire surface of the base coat. Since the top coat of clear paint is formed, it is not uniform that can not be expressed by the print printing method (moderate variations due to pattern coat coating occur, and all slightly different patterns can be obtained) natural stone, especially granite pattern is expressed Not only can the obtained building board be obtained, but the surface of the topcoat of clear paint is polished to make it a mirror surface, which improves the smoothness of the surface and makes it closer to the polished appearance of natural stone. The first top coat of the color clear paint is formed, so the color clear paint further enhances the sense of depth due to color changes. In addition to forming the first top coat of the color clear paint, the second top coat of the colorless clear paint is formed on the first top coat, and the second top coat of the color clear paint is formed.
Since the surface of the top coat is polished and mirror-finished,
Even if the polishing amount varies when polishing the surface of the top coat, only the thickness of the second clear top coat of the colorless clear paint changes, without polishing the first top coat of the color clear paint. The thickness of the first top coat of the color clear paint can be made uniform, color difference can be prevented, and the appearance of natural stone or artificial stone can be further approximated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a building board obtained by the method for manufacturing a building board of the present invention, wherein 1 is a substrate, 2 is a base coat, 3 is a patterned coat, 4 Is a first top coat and 5 is a second top coat.

Claims (1)

(57) [Claims] 1. A base coat of a paint having a concealing property is applied on a substrate, then a pattern coat having a pattern is formed on the base coat, and the first color clear paint is formed on the pattern coat over substantially the entire area of the base coat. A method for producing a building board, comprising forming a top coat, forming a second top coat of a colorless clear paint on the first top coat, and polishing the surface of the second top coat to give a mirror finish.