JP3129612B2 - How to paint building boards - Google Patents

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 a building board by coating a plurality of color stripes on the surface of the building board.

[0002]

2. Description of the Related Art In recent years, various types of building boards used for exterior walls of houses have been designed to improve the appearance design by painting the surface, and the painting of the surface is also accompanied by diversification of tastes of users. In addition to plain coatings, there are, for example, two-tone paints applied to the surface of the uneven pattern.

Conventionally, when performing two-tone paint for building board, after all the surface of the building board was coated by a spray coater, flow coater, only the convex portion of another uneven pattern of the building board in a roll coater color Had to be painted.

[0004]

However, in the above-mentioned conventional color coating method, at least two steps are required for the coating step, so that at least two steps are required for coating equipment and a large space is required for the coating line. However, there is a disadvantage that equipment costs are increased.
In addition, the large number of painting processes makes the painting process time-consuming and results in poor painting efficiency, which, combined with the high equipment costs mentioned above, is a major factor in increasing the production cost of color painted building boards. I was

[0005] The present invention has been made in view of such circumstances, and an object of the present invention is to efficiently paint a building board with a color stripe pattern in one step, and to reduce production costs. An object of the present invention is to provide a method of painting a building board that can be performed.

[0006]

In order to achieve the above object, a method of coating a building board according to the present invention is a method of painting a plurality of color stripe patterns on the surface of a building board conveyed by a conveyor. Arranging a large number of paint spray nozzles above the conveyor, spraying paint of a plurality of colors in a rectified state from separate paint spray nozzles respectively on the surface of the building board being transported , Part of the paint
By mixing them separately, the color stripe pattern of a plurality of colors is painted with the outline blurred (claim 1).

In this case, the mixing degree of different colors adjacent to each other in the color stripe pattern may be adjusted by adjusting the surface temperature of the building board by a heating means.

Alternatively, the degree of mixing of different colors adjacent to each other in the color stripe pattern may be adjusted by replacing the solvent of the paint with a solvent having a different volatility. 3).

Further, the mixing degree of different colors adjacent to each other in the color stripe pattern is adjusted by adjusting the surface temperature of the building board by heating means and replacing the solvent of the paint with a solvent having a different volatility. This may be done (claim 4).

[0010]

According to the construction board coating method of the present invention, a large number of paint spray nozzles are arranged above the conveyor, and a plurality of paints of different colors are separately applied to the surface of the transported building board. From the rectifier. This allows
In the process of building board passes below the paint spray nozzle Ki paint injected in commutation state from the coating material injection nozzle are painted in stripes on the surface of the building board, color stripe
The pattern is painted. At this time, the color stripe pattern ring
The different colors of paint near Guo are mixed and the outline is blurred
It is. The color stripe pattern drawn in this way becomes a multi-color color stripe pattern by spraying a plurality of color paints from different paint spray nozzles, respectively, and coating a color stripe pattern whose outline is blurred in one process. Is possible (claim 1).

At the time of this coating, if the degree of mixing of different colors adjacent to each other in the color stripe pattern painted on the surface of the building board can be adjusted arbitrarily, the degree of blurring of the outline of the color stripe pattern can be adjusted arbitrarily. The color stripe pattern can be arbitrarily adjusted to make the outline clear or blur. According to the experimental results of the present inventors, it is the drying speed of the paint that greatly affects the degree of mixing of adjacent different colors, and the drying speed of the paint depends on the surface temperature of the building board and the paint. Was determined to be the volatility (degree of ease of drying) of the solvent.

Therefore, in the second aspect, the mixing degree of different colors adjacent to each other in the color stripe pattern is adjusted by adjusting the surface temperature of the building board by the heating means. For example, if you want to make the outline of a color stripe pattern clear, increasing the surface temperature of the building board will accelerate the drying of the paint applied to the surface of the building board and reduce the degree of mixing of paints of different colors. The outline of the color stripe pattern becomes clear. That is, within the allowable temperature range of the paint used, as the surface temperature of the building board is increased, the drying speed of the paint increases, and the contour of the color stripe pattern becomes clearer.

On the other hand, when it is desired to increase the blur of the outline of the color stripe pattern, if the coating is carried out without heating and the surface temperature of the building board is kept at a normal temperature, the paint applied to the surface of the building board can be obtained. Drying is slowed, during which time mixing of paints of different colors progresses, resulting in a blurred outline of the color stripe pattern.

According to the third aspect of the present invention, the degree of mixing of different colors adjacent to each other in the color stripe pattern is adjusted by replacing the solvent of the paint with a solvent having a different volatility. For example, if you want to make the outline of the color stripe pattern clear, using a fast-drying solvent as the paint solvent will promote the volatile drying of the paint applied to the surface of the building board, and the degree of mixing of paints of different colors And the outline of the color stripe pattern becomes clear. On the other hand, if you want to blur the outline of the color stripe pattern, if a slow drying solvent is used as a solvent for the paint, the paint applied to the surface of the building board will dry more slowly, during which time a mixture of paints of different colors will be mixed. The fitting progresses, and the outline of the color stripe pattern becomes blurred.

Further, if both the surface temperature of the building board and the volatility of the solvent of the paint are adjusted as described in claim 4, the degree of mixing of different colors adjacent to each other in the color stripe pattern (outline of the contour) is adjusted. The adjustment range of the degree of blur can be further expanded.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the entire coating apparatus will be described with reference to FIGS. The building board 11 to be coated is placed on a transport conveyor 13 driven by a drive roller 12 and transported forward. A plurality of coating heads 14 are provided above the coating position of the transport conveyor 13.
Are arranged in the width direction, and a plurality of paint spray nozzles 16
Is connected. Each of the paint spray nozzles 16 is fixed to the holder 17 in a row in a state in which the spray port at the tip is downward. The diameter of each paint spray nozzle 16 is set to, for example, 200 to 1000 μm. Also, each
The arrangement pitch of the paint spray nozzles 16 is, for example, 0.5 to
The distance between the paint spray nozzle 16 and the object to be coated (the building board 11) is set to, for example, about 20 mm.

On the other hand, a paint supply pipe 19 is connected to the upper part of each coating head 14 via an electromagnetic valve 18, and the paint supply pipe 19 is connected to a paint tank 20 storing raw material paint.
It is connected to the. In this embodiment, three systems of the paint supply pipe 19 and the paint tank 20 are provided for painting, for example, three color stripe patterns. An air supply pipe 23 that supplies low-pressure air from a compressor 21 through a regulator 22 while adjusting the pressure through a regulator 22 is connected to the upper part of each paint tank 20, and the raw paint stored in each paint tank 20 is supplied to each paint tank by low-pressure air. Supply pipe 1
9 to each coating head 14, and each coating spray nozzle 1
From 6, the paint is sprayed in a rectified state (that is, a state in which the paint is not atomized). At this time, the pressure of the low-pressure air serving as a pressure source for injecting the paint is, for example, 0.3 to 0.5 kg.
f / cm ² .

In addition to the above pressure, the viscosity of the paint is also important as a condition for spraying paint from the paint spray nozzle 16 in a rectified state. When the viscosity is measured with an NK-2 cup, for example, 7 seconds or more. It is preferable to use a paint having a viscosity of 15 seconds or less / NK-2 cup, more preferably a paint having a viscosity of about 10 seconds / NK-2 cup. When a paint having a viscosity other than the above is used, the paint is not ejected from the paint ejection nozzle 16 in a rectified state, and the paint ejection nozzle 16 is likely to be clogged with the paint or spread in a spray form. Immediately before the coating position of the conveyor 13, as shown in FIG.
4 are provided.

A method of painting a three-color stripe pattern on the surface of the building board 11 using the painting apparatus configured as described above will be described below. In the case of painting a stripe pattern of a random color arrangement, the painting head 14 of each color paint is used.
, The paint spray nozzle 16 is connected at random with a hose 15. When a stripe pattern is painted in a predetermined color pattern, as shown in FIG. 4, the paint spray nozzle 16 is connected to the paint head 14 of each color by a hose having a predetermined color pattern. Connect at 15.

In the painting process, when the front end of the building board 11 conveyed by the conveyor 13 comes to just before the painting position, it is detected by the optical sensor 24, and each solenoid valve 18 is opened based on this detection signal. Is done. Thereby, the paint of each color in each paint tank 20 is jetted toward the surface of the building board 11 in a rectified state from each paint jet nozzle 16 under the pressure of low-pressure air. When the building board 11 passes below these paint spray nozzles 16, each paint spray nozzle 16
The paint sprayed in a rectified state is applied to the surface of the building board 11 in a stripe shape. The color stripe pattern thus drawn becomes a three-color color stripe pattern as shown in FIG. 3 by injecting three colors of paint from different paint spray nozzles 16, respectively, to form a plurality of color stripes in one process. Stripe pattern painting becomes possible. FIG.
In the figure, the stripes of each color are depicted in a dispersed manner, but actually, the boundaries of the stripes of each color are in contact. Of course, it is needless to say that the stripes of each color may be dispersedly drawn so that the color of the undercoat is exposed between the stripes of each color.

At the time of this painting, if the degree of mixing of adjacent different colors of the color stripe pattern painted on the surface of the building board 11 can be arbitrarily adjusted, it is possible to arbitrarily make the outline of the color stripe pattern clear or blur. Adjustment is possible, and the number of design variations can be increased. According to the experimental results of the inventor, it is the drying speed of the paint that greatly affects the degree of mixing of different colors adjacent to each other, and the drying speed of the paint is determined by:
It was found that the temperature was the surface temperature of the building board 11 and the volatility of the solvent of the paint (the degree of ease of drying).

Therefore, in this embodiment, the surface of the building board 11 is heated to normal temperature by heating the surface of the building board 11 by a heating means (for example, a hot air generator for blowing hot air) and adjusting the heating intensity. From the allowable temperature of the paint (for example, 9
0 ° C.) to adjust the degree of mixing of adjacent different colors of the color stripe pattern. When the surface temperature of the building board 11 becomes higher than the allowable temperature range of the paint, the solvent remaining in the coating film rapidly evaporates, and a phenomenon that a pinhole-like defect occurs in the coating film occurs. Is preferably kept below the allowable temperature of the paint (for example, 90 ° C.).

For example, when it is desired to make the contour of the color stripe pattern clear, if the surface temperature of the building board 11 is increased, the drying of the paint applied on the surface of the building board 11 is accelerated, and the paint of a different color is applied. The degree of mixing is reduced,
The outline of the color stripe pattern is clear. That is,
As the surface temperature of the building board 11 increases within the allowable temperature range of the paint used, the drying speed of the paint increases, and the contour of the color stripe pattern becomes clearer.

On the other hand, when it is desired to make the outline of the color stripe pattern more blurred, the building plate 11 is painted without heating and the surface temperature of the building board 11 is kept at room temperature. Thereby, the drying of the paint applied to the surface of the building board 11 is delayed, and during that time, the mixing of paints of different colors progresses, and the outline of the color stripe pattern becomes blurred. According to the experimental results of the inventor, when the surface temperature of the building board 11 was 60 ° C. or less, the outline of the color stripe pattern was blurred, and it was recognized that the outline became clear at 60 ° C. to 90 ° C.

Further, the degree of mixing of different colors adjacent to each other in the color stripe pattern may be adjusted by replacing the solvent of the paint with a solvent having a different volatility.
For example, when it is desired to make the outline of the color stripe pattern clear, if a quick-drying solvent (for example, a quick-drying thinner) is used as a solvent for the paint, the volatile drying of the paint applied to the surface of the building board 11 is promoted, The degree of mixing of paints of different colors is reduced and the outline of the color stripe pattern becomes clear. On the other hand, when it is desired to blur the outline of the color stripe pattern, if a slow-drying solvent (for example, a slow-drying thinner) is used as a solvent for the paint, drying of the paint applied to the surface of the building board becomes slower, As the mixing of paints of different colors progresses, the outline of the color stripe pattern becomes blurred.

In this case, to paint one building board 11, a paint of a specific color is mixed with a fast-drying solvent, and a paint of another color is mixed with a slow-drying solvent. Alternatively, a quick-drying solvent and a slow-drying solvent may be selectively used depending on the color of the paint. For example, in the pattern of FIG. 4, the paint for coating the concave portion 25 on the surface of the building board 11 uses a paint containing a fast-drying solvent, and the paint for coating the convex portion 26 contains a slow-drying solvent. Apply with paint. As a result, the paint applied to the concave portions 25 dries quickly and the convex portions 26
Hardly mixes with the paint applied to the surface, and the pattern is sharp. On the other hand, the paint applied to the convex portion 26 is dried slowly, and during this time, the mixture of paints of different colors progresses, and the outline of the color stripe pattern becomes blurred. In the pattern shown in FIG. 4, only the central convex portion 26 has a two-colored color stripe pattern, and the convex portions 26 on both sides are plainly painted with paints of different colors. Thus, the color stripe pattern may be partially applied to the surface of the building board 11.

Further, by adjusting both the surface temperature of the building board and the volatility of the solvent of the paint as described above, the adjustment width of the degree of mixing of different colors adjacent to each other (the degree of blurring of the outline) of the color stripe pattern can be adjusted. It can be enlarged, and the number of design variations can be further increased.

In the above embodiment, a number of paint spray nozzles 16 are arranged in a line in the width direction of the conveyor 13. However, for example, the paint spray nozzles 16 are arranged to be shifted back and forth for each paint color. May be.

In addition, the present invention is not limited to the color stripe pattern of three or two colors, and various modifications may be made without departing from the gist, such as painting four or more color stripe patterns. Needless to say, it can be implemented.

[0030]

As is apparent from the above description, according to the method for coating a building board of the first aspect of the present invention, a large number of paint spray nozzles are arranged above the conveyor to convey the building board being conveyed. The paint of a plurality of colors is sprayed in a rectified state from separate paint spray nozzles respectively on the surface of the
By mixing them separately, multiple color strikes
The pattern is painted with the outline blurred, so that the color stripe pattern with the outline blurred in one step can be efficiently painted on the surface of the building board, improving productivity and improving the painting line. Space and equipment costs can be reduced, and the production cost of color-painted building boards can be reduced. Moreover, unlike the conventional roll coater painting, the color stripe pattern is drawn on the surface of the building board in a non-contact manner, so even if an uneven pattern is formed on the surface of the building board, the color stripe pattern is painted without any problem It can be applied to the painting of building boards of any uneven pattern.

Furthermore, in the second aspect, the mixing degree of different colors adjacent to each other in the color stripe pattern is adjusted by adjusting the surface temperature of the building board by the heating means. The degree of blurring of the outline of the color stripe pattern can be arbitrarily adjusted, and the number of design variations can be increased.

In the third aspect, the degree of mixing of adjacent colors of the color stripe pattern is adjusted by replacing the solvent of the paint with a solvent having a different volatility. As in the case of the second aspect, the degree of blurring of the outline of the color stripe pattern can be arbitrarily adjusted, and the number of design variations can be increased.

Further, in the present invention, since both the surface temperature of the building board and the volatility of the solvent of the paint are adjusted, the degree of mixing of adjacent colors of the color stripe pattern (the degree of blurring of the contour) is adjusted. ) Can be increased, and the number of design variations can be further increased.

[Brief description of the drawings]

FIG. 1 is a front view of a coating apparatus showing one embodiment of the present invention.

FIG. 2 is a side view of a coating apparatus.

FIG. 3 is a plan view showing a color stripe pattern painted on the surface of a building board;

FIG. 4 is a diagram showing an example of a connection pattern (color arrangement pattern) of a paint spray nozzle to each paint head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Building board, 13 ... Conveyor, 14 ... Painting head, 16 ... Paint spray nozzle, 18 ... Solenoid valve, 19 ... Paint supply pipe, 20 ... Paint tank, 21 ... Compressor, 22
... Regulator, 23 ... Air supply pipe.

Claims (4)

(57) [Claims] 1. A method for coating a building board, in which a plurality of color stripe patterns are coated on the surface of a building board conveyed by a conveyor, comprising a plurality of paint spray nozzles arranged above the conveyor. , the surface of the building board which is conveyed to the injection of a plurality of colors paint commutation state from their respective separate paint injection nozzle, before
A paint method for a building board, characterized in that a plurality of color paints are partially mixed with each other to paint a color stripe pattern of a plurality of colors with a blurred outline . 2. The method for coating a building board according to claim 1, wherein the mixing degree of different colors adjacent to each other in the color stripe pattern is adjusted by adjusting the surface temperature of the building board by a heating means. . 3. The method for coating a building board according to claim 1, wherein the degree of mixing of adjacent colors of the color stripe pattern is adjusted by replacing the solvent of the paint with a solvent having a different volatility. . 4. A method of adjusting a mixing degree of different colors adjacent to each other in a color stripe pattern by adjusting a surface temperature of the building board by a heating means and replacing a solvent of the paint with a solvent having different volatility. The method for coating a building board according to claim 1, wherein: