JPH04363175A - Method for coating deeply engraved building material - Google Patents

Abstract

PURPOSE:To allow the execution of applying >=2 colors on a deeply engraved building material by line coating while improving the yield of a coating material. CONSTITUTION:This method consists in applying the coating materials of different coating colors on the building material 1 formed with rugged patters by deep engraving on the surface by applying these coating materials on the surface of the building material by coating means 2, 3, such as flow coaters, while transporting the building material 1 in one direction, then blowing off the coating materials by an air nozzle 4 on the downstream side of the coating position. The one coating material is applied in the coated amt. of >=1.4 times the coated amt. of the other coating material. The air is blown by the air pressure of the extent to fluidize the coating material on the side of the smaller coated amt. on the surface of the building material in the state of inclining the above- mentioned air nozzle 4 toward the downstream side on the coated surface side of the larger coated amt. within an angle theta1 range of 20 to 30 deg..

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for painting building materials whose surfaces have an uneven pattern formed by deep carving.

0002

[Prior Art] For example, wall materials and roof materials manufactured using inorganic raw materials such as cement have a gray or dark gray surface and lack aesthetic appeal. Painting has traditionally been done. In that case, the uneven pattern was usually line coated using a flow coater, roll coater, or spray.

0003

[Problems with the Prior Art] However, the above-mentioned coating using a flow coater and a roll coater is effective when the surface pattern has a small difference in unevenness, but is not effective for deeply carved building materials with a large difference in unevenness. The drawback was that the deeply carved pattern was lost. Also, spray painting can deal with deep carving patterns, but it requires spraying a large amount of paint, and even if you collect the excess paint, if you try to paint with two or more colors, the paints will overlap. Since they mix together, they cannot be recovered in a reusable state, resulting in poor yields. Therefore, it was unthinkable to paint deeply carved building materials by line painting, and moreover, in two or more colors.

0004

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention has been made for the purpose of improving the yield of paint and providing a coating method that can perform line coating on deeply carved building materials.

[0005]

[Means for Solving the Problems] That is, the method for painting deeply carved building materials of the present invention involves conveying the building material on the surface of which an uneven pattern is formed by deep carving in one direction, and painting the material at two locations in the width direction of the building material. A method in which paints of different colors are applied to the surface of building materials by a painting means, and then these paints are blown off with an air nozzle downstream of the application position, and one of the two paint colors is applied to the surface of the building material. At the same time, the air nozzle was tilted at an angle of 20 to 30 degrees with respect to the direction of conveyance of the building material, toward the downstream side of the painted surface where the amount of paint was larger than that of the other paint. This method is characterized by blowing air at such an air pressure as to fluidize the paint on the surface of the building material, which has a smaller amount applied.

[0006]

[Example] Next, an example of the present invention will be described. FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view of the embodiment, and FIG. 3 is an enlarged view of essential parts of the embodiment. That is, the coating method for deeply carved building materials of the present invention involves transporting a building material 1 made of an inorganic raw material such as cement and having an uneven pattern formed by deep carving on its surface in one direction shown by the arrows in FIGS. 1 and 2. Paints of different colors are applied to the surface of the building material 1 at two locations in the width direction of the building material 1 using painting means 2 and 3 such as a flow coater, and then these paints are applied to the surface of the building material 1 downstream of the application position using an air nozzle 4. In this method, one of the two colors of paint is applied in an amount of at least 1.4 times that of the other paint, and the air nozzle 4 is applied at a distance of 20 to 20 degrees in the building material conveyance direction. 30 degree angle θ
In the range of 1, air is blown with air pressure such that the paint on the side where the amount of paint is applied is fluidized on the surface of the building material while the paint surface is tilted toward the downstream side of the side where the amount of paint is applied is larger. Next, a specific example of coating using the method of this invention will be explained. In this painting example, the width of building material 1 in Figure 1 is 462 mm, and 2
Apply red paint to area a from 00 to 250 mm, and apply red paint to area b from 200 to 250 mm from the right end on the right side.
200 to 250 g of red paint is applied using a flow coater or nozzle.
/m2 and yellow paint at 130 to 180 g/m2
Apply. In that case, the air nozzle 4 is positioned so that the blowing angle θ2 is 75 degrees with respect to the surface of the building material, as shown in Fig. 3, and the air nozzle 4 is positioned so that the blowing angle θ2 is 75 degrees with respect to the surface of the building material, and air is applied from a position 4 cm away from the building material 1 that is being fed at a speed of 30 m/min. Spray.

[0007]

[Operation] According to the above method, since the air nozzle 4 is tilted toward the red paint application side, the air pressure causes
The red paint flows to the left end side of the building material 1 and falls from the end, and can be collected. In this case, since the amount of red paint applied is larger than that of yellow paint, even if some of the yellow paint flowing in the same direction is mixed with the red paint, it does not flow down from the left end of the building material 1. Therefore, only pure red paint can be recovered. In addition, it is possible to uniformly apply red and yellow paint to deeply carved patterns using air pressure, and it also allows building materials to be painted in three colors: red, yellow, and a color that is a mixture of both colors.
This means that it can be painted.

[0008]

[Effects of the Invention] As explained above, this invention applies two colors of paint to building materials by increasing the amount of one paint, and then blowing air to blow off the excess paint. However, the excess coating of one of the paints can be recovered in a reusable state without mixing with the other paint. Therefore, while surface painting with a uniform film thickness can be applied to deeply carved patterns using air pressure, coating with two or more colors can be performed with a high yield, and multicolor line painting can be performed on deeply carved building materials.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the invention.

FIG. 2 is a side view of an embodiment of the invention.

FIG. 3 is an enlarged view of main parts of an embodiment of the invention.

[Explanation of symbols]

1 Building materials 2, 3 Coating means 4 Air nozzle

Claims (1)

[Claims] Claim 1: A building material having an uneven pattern formed by deep carving on its surface is conveyed in one direction, and paints of different colors are applied to the surface of the building material by a coating means at two locations in the width direction of the building material, and then In this method, these paints are sprayed using an air nozzle on the downstream side of the application position, and one of the two paint colors is mixed with 1. of the other paint.
Apply at least 4 times the coating amount, and also with the air nozzle tilted at an angle of 20 to 30 degrees to the direction of construction material conveyance toward the downstream side of the painted surface where the coating amount is large, and where the coating amount is small. A method for painting deep-carved building materials, which is characterized by blowing air with enough air pressure to fluidize the side paint on the surface of the building material.