JP2000301060A - Coating method of ceramic based plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply gradation coating with one kind of a coating roll by bringing the coating roll having fine projecting and recessed parts formed on the surface of an elastic layer into pressurized contact with the surface of a ceramic based plate to coat while substantially changing the pressing force in the thickness direction of the ceramic based plate. SOLUTION: A coating material supply roll 3 is brought into contact with the coating roll 1 for applying gradation coating on the surface of the ceramic based plate 2 and a coating material 5 in a coating material tank 4 is supplied to the coating roll 1 through the coating material supply roll 3. Both of the coating roll 1 and the coating material supply roll 3 are supported by a vertically displaceable base frame 6 and the base frame 6 is made vertically displaceable by a driving device such as an air cylinder 7. The coating roll 1 is composed of an intermediate elastic layer and a surface elastic layer, which are concentrically formed around a metallic core and the fine projecting and recessed parts are uniformly formed on the surface of the surface elastic layer. The surface elastic layer is made harder than the intermediate elastic layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating ceramic board.

[0002]

2. Description of the Related Art A ceramic building material such as a fiber-reinforced cement building material, if left as it is, has a poor design because it has a flat surface and an achromatic color ranging from gray white to gray black. Therefore, it is common practice to paint the surface of this type of building plate in various colors.

[0003] Gradation painting is one type of such painting, and painting in which the concentration of coloring is changed so as to produce an arbitrary pattern on the surface of a wall plate is sometimes performed.

[0004]

By the way, as a concrete means for performing the above-mentioned gradation coating, spray coating or coating with a roll can be considered. Has a disadvantage that it is very difficult to achieve a uniform finish and uniform quality cannot be obtained.

[0005] On the other hand, there is printing as a means to surely finish such a colored coating. However, since a gradation plate must be manufactured each time the pattern type changes, it is not practiced in the case of a small number of various kinds of decorative plates. There was a difficult problem. In addition, there is also a case for a plate for gradation by changing the distribution density and the size of the particle size of the dots on the roll surface, but, like the printing, a paint roll must be manufactured each time the pattern type changes, As described above, there is a problem that it is difficult to perform the process in the case of decorative boards of various kinds in small quantities.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made to provide a method of applying gradation coating to a kind of coating roll.

[0007]

According to a first aspect of the present invention, there is provided a method for coating a ceramic-based plate material, comprising the steps of: providing a coating roll having an elastic layer surface and forming fine irregularities uniformly distributed on the elastic layer surface. On the surface of the ceramic plate, the pressing force in the thickness direction of the ceramic plate is substantially changed, and the ceramic plate is pressed and painted, and then the top coat is applied.

According to this method, the gradation of the coating changes according to the pressing force of the roll against the surface of the plate material, so that gradation coating can be easily realized with one roll. Further, since the paint is absorbed by the ceramic-based plate material having a good hygroscopic property, the flow of the paint in the portion where the paint is thickly applied is well prevented, so that the handleability of the plate material is improved. In the method of coating a ceramic plate according to claim 2, the surface of the ceramic plate is coated with a coating roll formed by uniformly distributing fine irregularities on the surface in the method of coating the ceramic plate. Use something.

According to the method of the present invention, a pattern having a high design quality can be easily realized by a complicated combination of the color of the base treatment and the color of the gradation.

[0010]

Next, an embodiment of the present invention will be described. Embodiment 1 FIG. 1 is a side view of an apparatus for carrying out the method of the present invention according to Embodiment 1, FIG. 2 is a cross-sectional view of a coating roll, and FIG. 3 is an enlarged cross-sectional view of a surface portion of the coating roll.

In FIG. 1, reference numeral 1 denotes a coating roll, which is a coating roll for applying gradation coating to the surface of a ceramic plate 2. The paint supply roll 3 is brought into contact with the paint supply roll 1, and the paint supply 5 is supplied to the paint supply roll 3. The paint 5 in the paint tank 4 is supplied to the paint supply roll 3 by rotating the paint supply roll 3.

The coating roll 1 and the paint supply roll 3 are both supported on a base frame 6 which can be displaced vertically, and this base frame 6 can be displaced vertically by a driving device such as an air cylinder device 7. I have. The coating roll 1 includes an intermediate elastic layer 1b and a surface elastic layer 1c formed concentrically around a metal core 1a as shown in an enlarged cross section in FIG. As shown in the figure, fine irregularities 1d are formed in a uniformly dispersed state.

The fine irregularities 1d are engraved by, for example, laser engraving, and the number of engraved lines is 40 to 67 Lpi, depending on the height difference of the uneven pattern and the distribution density. Here, "Lpi" refers to a unit representing the fineness of fine irregularities arranged regularly in a grid pattern, and refers to the number of lines per inch. In the above, the elastic layers 1b and 1c are such that the surface elastic layer 1c is harder than the intermediate elastic layer 1b.

As shown in FIG. 4, the coating roll 1 is supported by an arm 8 so as to be rotatable about a paint supply roll 3, and the arm 8 is rotated. Thus, it may be made to displace substantially vertically on the surface of the ceramic plate 2. Next, a method of coating a ceramic plate using the above apparatus will be described.

The paint roll 1 is rotated and the paint 5 is supplied from the paint tank 4 so that the paint roll 1 is moved to the ceramic plate 1.
Transfer while contacting the surface. At this time, the air cylinder device 7 is driven to displace the base frame 6 up and down, and the coating is performed while changing the pressing force of the coating roll 1 on the ceramic plate 2. For this reason, the coating state of the surface of the ceramic-based plate material 2 is such that a portion where the pressing force of the coating roll 1 is high is thick and a portion where the pressing force is low becomes thin, and these are repeated regularly or irregularly, so that gradation coating is realized.

Further, since the ceramic board 2 is hygroscopic, the coated paint is quickly absorbed and dried. Therefore, handling becomes possible without using any drying means. For this reason, after applying a complicated gradation coating, there is no possibility that the corner pattern is disturbed due to handling failure or the like.

Thereafter, clear coating and top coat coating are performed on the surface of the coated plate material. Embodiment 2 As Embodiment 1 described above, a case is described in which a plate material not subjected to a base treatment is applied by the coating roll 1, but a plate material subjected to a base treatment may be used instead. In this case, the color of the base treatment is made different from the color of the paint to be applied by the coating roll 1 so that the color of the base treatment appears in a portion where the gradation coating is thin or non-existent.

Next, a clear coating and a top coat coating are performed on the surface of the coated plate material. According to the second embodiment,
A complex colored pattern can be obtained by a combination of the color of the gradation coating and the base color.

[0019]

As described above, according to the method for coating a ceramic plate according to the present invention, gradation coating at an arbitrary pitch is automatically applied by a kind of roll, and the coloring of gradation, which has been difficult in the past, is very large. It is easily possible. Further, if the gradation coating by the coating roll is directly performed on the surface of the ceramic-based plate material having good hygroscopicity, the paint having a different density depending on the part is absorbed by the plate material, so that the paint is dried early and the handling becomes easy.

Further, by making the background color and the gradation color different, there is an effect that a complicated colored pattern can be realized with only one coating roll.

[Brief description of the drawings]

FIG. 1 is a side view of a coating apparatus according to an embodiment.

FIG. 2 is a sectional view of a coating roll in the embodiment.

FIG. 3 is a sectional view of a surface portion of a coating roll in the embodiment.

FIG. 4 is a side view of another configuration example of the coating apparatus according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Painting roll 2 Ceramic board 3 Paint supply roll 4 Paint tank 5 Paint

Claims (2)

[Claims] A coating roll having an elastic layer surface and formed by uniformly distributing fine irregularities on the surface of the elastic layer, applies a pressing force in the thickness direction of the ceramic plate to the surface of the ceramic plate. A coating method for ceramic-based sheet material, which comprises substantially changing the pressure, applying the coating, and then applying a top coat. 2. The method for coating a ceramic plate according to claim 1, wherein the surface of the ceramic plate coated with a coating roll formed by uniformly distributing fine irregularities on the surface is ground-treated.