JP3383528B2 - 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 painting a building board, which paints a color pattern on the uneven surface of the building board.

[0002]

2. Description of the Related Art In recent years, various building boards used for outer walls of houses have been improved in appearance design by applying a coating on the surface. Not only plain paint but also color paint is available. Conventionally, when color painting is applied to a building board, as shown in, for example, JP-A-56-73577, the entire surface of the building board is undercoated with a flow coater or a spray coater, and then the surface of the building board is coated with a roll coater. Only the convex part of the uneven pattern of was painted in a different color.

However, since the conventional roll coater can coat only flat surfaces of the same height, unevenness in the convex portions or uneven patterns having different heights of the convex portions can cause uneven coating or unpainted portions. , I can't do high quality painting.

In order to solve this problem, Japanese Patent Laid-Open No. 58-58
In Japanese Patent No. 58154, instead of a roll coater, an endless sheet is installed above a conveyor, and while coating the endless sheet with a transfer roller, the endless sheet is rotated in synchronism with the conveyor to rotate the endless sheet. The paint applied to the endless sheet is transferred to the convex portion of the building board by pressing it against the convex portion of the building board on the conveyor with a large number of small width roller elements. In this coating method, the roller that presses the endless sheet against the surface of the building board is divided into a large number of narrow roller elements, and each roller element is independently supported so that it can move up and down. The endless seat can be freely deformed according to undulations and changes in height,
A uniform coating can be transferred to the convex parts of the building board.

[0005]

However, even with the coating method using the above endless sheet, the convex portion of the building board can be coated with only one color as in the roll coater, and it is not possible to coat the convex portion with a color pattern. It is impossible.

Conventionally, in the case of coating a color pattern on a convex portion of a building board, JP-A-56-73577 and JP-A-5-73577.
As shown in Japanese Patent Publication No. 15838, after the convex portion of the building board is intermediately coated with a roll coater, a convex coating is partially applied to the convex portion of the building board by using a screen printing plate or a letterpress roll to form a convex structure. I try to paint a color pattern on the part. However, this coating method has a drawback that the coating must be repeated for the number of the coating colors of the convex portions, the number of steps increases, the coating efficiency decreases, and the cost increases.

The present inventor has, in order to eliminate this drawback,
As disclosed in JP-A-8-112567, a method of coating a color pattern on the surface of a building board with an inkjet coating machine is proposed.

However, according to this ink jet coating method, even when it is desired to apply a color pattern only to the convex portions of the building board, a part of the coating material protrudes into the concave groove portion, or the coating material scattered by the jet pressure of the ink jet nozzle forms into the concave groove portion. It may adhere, which may reduce the coating quality.

The present invention has been made in view of the above circumstances, and an object of the present invention is to paint a building board capable of coating a building board with a high-quality color pattern free from paint spillage and scattering. To provide a method.

[0010]

In order to achieve the above object, the method for coating a building board according to claim 1 of the present invention is to install a pattern transfer belt above a conveyor for carrying the building board, and transfer the pattern. Paint a different color on the surface of the belt with an ink jet coating machine to draw a color pattern, and press the pattern transfer belt while pressing the pattern transfer belt against the surface of the building board on the conveyor with a rubber roll for transfer. By rotating in synchronization with the conveyor, the color pattern drawn on the surface of the pattern transfer belt is transferred to the surface of the building board. As a result, a color pattern can be painted on the surface of the building board in a single painting process.

According to this coating method, the pattern transfer belt and the rubber roll that holds the convex and concave portions have unevenness even if the convexes and concaves of the uneven pattern on the surface of the building board are uneven or the heights of the convexes are different. By freely deforming according to changes in height,
The pattern transfer belt can be brought into close uniform contact with the convex parts of the building board, enabling uniform color coating without uneven coating or uncoated areas. Moreover, the paint adheres only to the contact area between the pattern transfer belt and the convex part of the building board, and the paint does not adhere to the concave groove portion where the pattern transfer belt does not contact, so high-quality color that does not stick out or scatter The pattern can be painted.

By the way, even if the drawing timing of the color pattern on the pattern transfer belt by the ink jet coating machine and the conveyance timing of the building board are deviated, the drawing range of the color pattern on the pattern transfer belt is set in consideration of the deviation of the timing. If enlarged, a color pattern can be transferred to the entire building board. However, in this case, as the amount of paint used increases, the positional relationship between the conveyed building board and the color pattern pattern transferred to it does not become constant, and the position of the color pattern pattern shifts for each building board.

As a countermeasure against this, a sensor for detecting a building board conveyed to the color pattern transfer position by the conveyor is installed as in claim 2, and the ink jet coating machine is controlled based on the output signal of the sensor. You can do it. By doing so, the timing of drawing the color pattern on the pattern transfer belt by the inkjet coating machine can be accurately synchronized with the timing of conveying the building board, and the drawing range of the color pattern on the pattern transfer belt can be minimized. Therefore, the paint can be saved, the positional relationship between the conveyed building board and the color pattern pattern transferred to the building board can be made constant, and the building board can be painted with a color pattern without misalignment.

Further, as described in claim 3, it is preferable that the transferred portion of the pattern transfer belt is cleaned with a cleaning device before the pattern transfer belt is drawn by the ink jet coating machine. By doing so, it is possible to draw a color pattern on the pattern transfer belt from which the stain of the paint has been removed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the entire coating system will be described with reference to FIG. A pattern transfer belt 13 formed of a resin sheet or the like is installed above the conveyor 12 that conveys the building board 11. The pattern transfer belt 13 includes a drive roll 14 and transfer rubber rolls 15-1.
7, the width of the pattern transfer belt 13 is wider than that of the building board 11. The pattern transfer belt 13 is rotationally driven in the same direction at the same traveling speed as the conveyor 12 by the drive roll 14, and the pattern transfer belt 13 is moved on the conveyor 12 by the transfer rubber rolls 15 to 17 which rotate in synchronization with this. It is pressed against the surface of the building board 11.

On the other hand, above the pattern transfer belt 13, for example, two inkjet coating machines 20 are installed. Each inkjet coating machine 20 has the same configuration,
The color of the sprayed paint is different. Hereinafter, the configuration of the inkjet coating machine 20 will be described with reference to FIG. A coating head 21 is arranged above the pattern transfer belt 13, and a large number of injection nozzles 22 are attached downward to the lower surface of the coating head 21 via valves 23. The jet nozzles 22 are arranged in a line in the width direction so as to cover the entire width of the pattern transfer belt 13 running therebelow.

The coating head 21 is connected to a lower portion of a coating tank 25 via a coating supply pipe 24. An air supply pipe 28, which supplies compressed air from a compressor 26 while adjusting the pressure through a regulator 27, is connected to the upper portion of the paint tank 25, and the paint stored in the paint tank 25 is compressed by the paint supply pipe 2
4 is pressure-fed to the coating head 21, and the coating material is sprayed from the spray nozzles 22 onto the surface of the building board 11.

The pattern pattern data is stored in the memory 30 of the computer 29 which controls each ink jet coating machine 20. The computer 29 uses this memory 3
A control signal is output to the valve control device 31 according to the pattern pattern data read from 0, and the opening / closing timing (paint injection timing) of the valve 23 of each injection nozzle 22 is individually controlled by the control signal, and the pattern transfer belt 1
Draw a pattern pattern on the surface of 3.

In this embodiment, two ink jet coating machines 20 are used, and paints of different colors are sprayed by each ink jet coating machine 20 to draw a pattern, so that two color patterns are transferred to the pattern transfer belt 13. Draw on the surface of.
Generally, N inkjet coating machines 20 may be used to draw a color pattern of N (N ≧ 2) colors. However, 1
Even with a single inkjet coating machine, color patterns can be drawn by dividing the coating head and connecting it to different paint tanks.

A sensor 32 (see FIG. 1) such as an optical sensor for detecting the building board 11 is installed at a position a predetermined distance before the color pattern transfer position by the pattern transfer belt 13, and the output signal of this sensor 32 is stored in the computer. 29 is input. The computer 29 accurately synchronizes the drawing timing of the color pattern by the inkjet coating machine 20 with the transportation timing of the building board 11 based on the output signal of the sensor 32.

As shown in FIG. 1, a cleaning device 33 is installed in the middle of the belt traveling path from the color pattern transfer position (the positions of the rubber rolls 15 to 17) to the drawing position by the ink jet coating machine 20, and the pattern transfer belt 13 is cleaned. The transferred portion is cleaned in the process of passing through the cleaning device 33. As a result, the ink jet coating machine 2 is applied to the pattern transfer belt 13 from which the dirt of the paint has been washed.
With 0, a color pattern can be drawn.

With the coating system configured as described above,
When color-painting the building board 11 having an uneven pattern on the surface, the entire surface of the building board is undercoated with a flow coater or a spray coating machine in advance. After that, the building board 11 is conveyed by the conveyor 12, and when the front end of the building board 11 is detected by the sensor 32, first drawing by the inkjet coating machine 20 on the right side of FIG. 1 is started, and then the pattern transfer belt 13 When the start end of the drawing pattern of (1) reaches directly below the left inkjet coating machine 20, the left inkjet coating machine 20 starts drawing with a different color paint. As a result, the start ends of the two-color drawing patterns drawn by the left and right inkjet coating machines 20 coincide with each other, and the two-color color patterns are drawn on the surface of the pattern transfer belt 13 without color shift.

After that, when the front end of the building board 11 comes into contact with the pattern transfer belt 13, the building board 11 receives the pattern transfer belt 1.
3 and the conveyor 12. At this time, the front end of the building board 11 coincides with the start end of the drawing pattern of the pattern transfer belt 13 (or the start end of the drawing pattern of the pattern transfer belt 13 is set to the building board 11 in consideration of an error in conveyance speed).
Should be reached slightly before the front end of. Then, the pattern transfer belt 13 is transferred to the rubber rolls 15 to 1 for transfer.
The pattern transfer belt 13 is rotated in synchronism with the conveyor 12 while being pressed against the surface of the building board 11 on the conveyor 12 at 7, so that the color pattern drawn on the surface of the pattern transfer belt 13 is rotated. 11 is transferred to the surface.

At this time, the pattern transfer belt 13 and the rubber rolls 15 to 17 for holding the pattern transfer belt 13 even if the convex portions of the uneven pattern on the surface of the building board 11 are uneven or the heights of the convex portions are different.
The pattern transfer belt 13 can be brought into close uniform contact with the convex portions of the building board 11 by freely deforming in accordance with the undulations of the convex portions and the change in height. Color painting is possible. Moreover, since the paint adheres only to the contact portion between the pattern transfer belt 13 and the convex portion of the building board 11 and the paint does not adhere to the concave groove portion where the pattern transfer belt 13 does not contact, the paint does not overflow or scatter. Can paint quality color patterns.

When the sensor 32 detects the end of the building board 11, the inkjet coating machine 2 on the right side of FIG.
0 is stopped, and then the end of the drawing pattern of the pattern transfer belt 13 is on the left side of the inkjet coating machine 20.
Inkjet coating machine 2 on the left side when it reaches right below
Stop the paint spray of 0. As a result, the end of the drawing pattern of the pattern transfer belt 13 matches the end of the building board 11 (or the end of the drawing pattern of the pattern transfer belt 13 is slightly smaller than the end of the building board 11 in consideration of an error in transport speed). To arrive later).

In this way, by controlling the drawing timing of the color pattern on the pattern transfer belt 13 by the ink jet coating machine 20 based on the output signal of the sensor 32 for detecting the building board 11, the color on the pattern transfer belt 13 is controlled. The pattern drawing timing can be accurately synchronized with the conveyance timing of the building board 13, and the drawing range of the color pattern on the pattern transfer belt 13 can be minimized.
The paint can be saved, the cost can be reduced, and the positional relationship between the conveyed building board 11 and the color pattern pattern transferred to the building board 11 can be made constant, so that the building board 11 can be painted with a color pattern without misalignment.

In the above embodiment, the pattern pattern data drawn by the ink jet coating machine 20 is stored in the memory 39.
Was stored in advance, and a fixed pattern pattern was drawn on the pattern transfer belt 13 according to the stored data.
Random pattern data may be automatically created by the computer 29 and the random pattern may be drawn on the pattern transfer belt 13.

[0028]

As is apparent from the above description, according to the building board coating method of claim 1 of the present invention, a color pattern is drawn on the surface of the pattern transfer belt by an ink jet coating machine, and the pattern transfer belt is drawn. Since the color pattern is transferred by pressing the rubber roll for transfer onto the surface of the building board, it is possible to paint a high-quality color pattern without paint spillage or splattering on the building board very efficiently, thus improving productivity and cost. It can improve both the paint quality and the coating quality.

Further, according to the second aspect of the invention, since the building board to be transferred to the color pattern transfer position is detected by the sensor to control the ink jet coating machine, the drawing timing by the ink jet coating machine is accurately set to the transportation timing of the building board. The color pattern can be painted on the building board without any misalignment while the paint can be saved.

In the third aspect of the present invention, the transferred portion of the pattern transfer belt is washed by the washing device. Therefore, it is possible to surely remove the stain of the paint adhering to the pattern transfer belt before drawing with the ink jet coating machine. You can

[Brief description of drawings]

FIG. 1 is a side view of an entire coating system showing an embodiment of the present invention.

[Figure 2] Front view of inkjet coating machine

[Explanation of symbols]

11 ... Building board, 12 ... Conveyor, 13 ... Pattern transfer belt, 15-17 ... Rubber roll, 20 ... Inkjet coating machine, 21 ... Coating head, 22 ... Injection nozzle, 23 ... Valve, 29 ... Computer, 32 ... Sensor, 33 ... cleaning equipment.

Claims (3)

(57) [Claims] 1. A method for coating a building board, wherein a color pattern is painted on an uneven surface of the building board, wherein a pattern transfer belt is installed above a conveyor for conveying the building board, and an ink jet is formed on the surface of the pattern transfer belt. Draw a color pattern by spraying different color paints with a coating machine, and synchronize the pattern transfer belt with the conveyor while pressing the pattern transfer belt against the surface of the building board on the conveyor with a rubber roll for transfer. A method for coating a building board, wherein a color pattern drawn on the surface of the pattern transfer belt is transferred to the surface of the building board by rotating. 2. The sensor for detecting a building board conveyed to a color pattern transfer position by the conveyor is installed, and the inkjet coating machine is controlled based on an output signal of the sensor. How to paint building boards. 3. The painting of a building board according to claim 1, wherein the transferred portion of the pattern transfer belt is washed by a washing device before drawing on the pattern transfer belt by the inkjet coating machine. Method.