JPH10309514A - Method for coating substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to coat a coated plate varying in the color tones and texture of individual projecting part surfaces and having excellent durability by using air spray nozzles having a coating material discharge width approximately coinciding with the surface width of the square shaped projecting parts of a substrate and the control signals from a computer for controlling the coating material in combination. SOLUTION: The substrate 11 which has the projecting parts 4 on its surface and is previously molded with a lower layer coating film is transported on a conveyor 12. A sensor 23 detects the front end of the substrate 11 and transmits a detection signal to the computer 22. The computer 22 begins to count pulses by this signal and when the number of the pulses attains a previously stored set region, the computer transmits and commands the control signals based on pattern data 21 of color tone patterns according to the number of the pulses to a successive valve controller 19, thereby discretely controlling the opening and closing of coating material opening/ closing control valves 13. The coating material 16 is discharged to the prescribed positions on the surface of the substrate 11 under transportation from the airless spray guns 14, by which the projecting parts 4 are coated with the color tones based on the pattern data 21 and the desired substrate is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a multi-layered structure having a large number of rectangular projections formed on a surface thereof with grooves interposed therebetween. The present invention relates to a coating method in which a surface of each or a predetermined convex portion of a formed substrate is painted so as to be finished in a different color to finish a pattern such as a brick pattern, a tile pattern or a masonry pattern.

[0002]

2. Description of the Related Art In recent years, as a plate material or the like used for an exterior, a groove is formed on a substrate surface by cutting, embossing, or the like, and the groove and a large number of rectangular protrusions partitioned through the groove are respectively formed. BACKGROUND ART Painted plates obtained by painting so as to obtain different color tones and having an appearance in which bricks are piled up or tiles are stacked are increasing.

[0003] As a coating method for obtaining a coated plate having such an appearance, a paint corresponding to the finish color of the groove is spray-coated over the entire surface of the substrate through, for example, a primer layer.
Then, only the convex portions are coated with a roll coater or the like, and a coating method in which the groove portions and the convex portions are separately painted in different colors is adopted.In a coated plate obtained by such a coating method, each convex portion is It is the same color tone, and it should not affect the subtle color change of one piece or one piece like a real brick or tile, nor the subtle color change within one piece of brick or tile. It is scarce.

As means for solving such a problem, as disclosed in JP-A-6-155729 and JP-A-7-62828, a portion corresponding to a tile or a brick by a jet printer is used. A technique has been proposed in which only the convex portion is painted in a different color tone between the convex portions or in one convex portion in a different color tone. However, since the jet printer is a line type, the nozzle diameter is 0 mm. 0.1 to 0.4 mm, nozzle pitch 0.
If the substrate is to be coated with a thickness of 5 to 4 mm, the number of nozzles becomes enormous in order to coat the entire width direction, and there is a problem that a large amount of labor is required for maintenance and inspection of each nozzle.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to provide a substrate having a large number of rectangular projections partitioned on the surface by grooves. Using a simple airless spray device that allows easy maintenance and inspection of the individual nozzles, the color tone and texture of each convex surface differ on the convex surface of the substrate on which the lower layer coating film with a different color tone is formed in advance. Another object of the present invention is to provide a method for coating a coated plate having excellent durability.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have found that an airless spray nozzle whose paint discharge width substantially matches the surface width of a rectangular projection on a substrate is provided. By using in combination with a control signal from a computer that controls the discharge and stop of the paint from the spray nozzle, the above-mentioned object is achieved, and a paint that approximately matches the surface width of the square convex portion of the substrate An individual switching device that can switch a supply system of a plurality of paints having different colors in a pressurized state while appropriately selecting a supply system of the supply systems by using an airless spray nozzle having a discharge width. And preferably, the switching device is operated by a timer or a control signal from a computer. Found that this object is achieved by Gosuru, we have reached the present invention.

That is, a first aspect of the method for coating a substrate of the present invention is a substrate having a large number of rectangular convex portions partitioned on the surface by grooves, wherein the convex portions have a width of the substrate. A plurality of rows arranged in the direction, and the grooves and the convex portions are each coated with a lower layer coating film having a different color tone in advance. Above the substrate, a plurality of airless spray nozzles whose paint discharge width is approximately equal to the surface width of the convex portion are arranged in the width direction of the conveyor, and the paint discharge from each airless spray nozzle is performed by a control signal from a computer. By controlling the stop and coating the predetermined convex surface of the substrate, the convex surface of each convex surface has two or more kinds of colors and different color tones randomly exist in the substrate. Get the substrate It is characterized in.

A second aspect of the method for coating a substrate according to the present invention is a substrate having a large number of rectangular projections partitioned on the surface by grooves, wherein the projections have a width corresponding to the width of the substrate. A plurality of rows are arranged in the direction, and the grooves and the protrusions are each coated with a lower layer coating film having a different color tone in advance, and the surfaces of the respective protrusions are painted in different colors while the substrate is transported by a conveyor. In the method, a plurality of airless spray nozzles having a paint discharge width substantially matching the surface width of the projection are arranged above the substrate in the width direction of the conveyor,
All of the supply systems for each of the plurality of paints having different color tones in a pressurized state are individually switched via individual switching devices that can be switched while appropriately selecting a specific one of the supply systems. Connected to the airless spray gun, the individual switching devices are independently controlled to change the paint supplied to the airless spray gun and discharge the paint from the airless spray nozzle, and each convex surface has a different color tone. It is characterized by painting with a texture.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The coating method of the present invention will be described below in detail. In the present invention, `` a substrate having a large number of rectangular convex portions partitioned on the surface via a groove portion, the convex portions are arranged in a plurality of rows in the width direction of the substrate, and the groove portion and the `` Substrate in which the lower layer coating with different color tone is formed in advance on each convex part '' is a slate board, a wood chip cement board, a pulp cement board, an asbestos cement board, a lightweight board used for exterior wall material or interior material Aggregate-mixed cement board, foam concrete board, glass fiber reinforced cement board,
In addition to inorganic substrates such as calcium silicate plates, magnesium carbonate plates, and other hydraulic plates, and cold-rolled steel plates, stainless steel plates, aluminum plates, copper plates, etc., zinc, zinc-based alloys, aluminum, chromium, nickel or these Various metal plates, such as plated steel plates plated with alloys of
The surface has a large number of rectangular projections (corresponding to one tile, brick, or stone) partitioned on the surface by a groove by embossing or groove cutting, and the projections are in the width direction of the substrate. A plurality of rows are arranged in a row, and a square convex pattern such as brick tone, tile tone or stone masonry tone is provided, and the entire surface of the substrate is coated with a paint that becomes a finish color of the groove by, for example, airless spray, After drying, only the convex portion is coated with, for example, a roll coater using a paint that is one of the finished colors of the convex portion, so that the groove and the convex portion are provided with lower-layer coating films having different color tones. It is.

[0010] In the present invention, "the color tone is different".
Means that there are differences in hue, light and shade, shade, presence or absence of gloss, etc., and that there is a difference in appearance, and `` substrate '' means the surface before each convex part is painted in a different color tone The term "painted plate" or "painted substrate" means that the surface of each projection is painted in a different color tone.

In the present invention, the lower coating film is provided for the purpose of reinforcing a substrate having a weak surface strength or preventing rainwater or the like from entering the substrate from the outside, and is formed directly on the substrate surface. Alternatively, a primer may be applied to the surface of the substrate and formed via the primer layer.
The lower layer coating film is obtained by coating any type of conventionally used various paints such as an organic solvent type such as a baking type, a normal dry type, and an active energy ray-curable type, an aqueous type, and a solventless type. Coating with a coating film or any of these types of paints of conventionally used substrate reinforcing primers such as baking type, air drying type, organic solvent type such as active energy ray curing type, water type, solventless type etc. The resulting coated film can be used.

In the present invention, a conveyor speed of 1 to 80 m / min can be generally used, but a range of 10 to 60 m / min is preferable from the viewpoint of productivity and reliable coating. . The airless spray method itself used in the present invention is known. In the normal airless spray method, the paint discharge width (generally called the spray pattern width)
Having a height of 7.5 to 60 cm is generally used, and in particular, a frequency of 17 to 48 cm is frequently used.

On the other hand, the feature of the present invention is that the paint discharge width is appropriately selected by appropriately selecting various conditions such as a nozzle diameter, a nozzle shape, a distance between a nozzle tip and an object to be coated, a paint viscosity, and a discharge pressure. Is set to a width substantially matching the surface width of the rectangular projections of the substrate, preferably a width of 3 to 20 cm. In view of the design expression, it is more preferable that the surface width of the square convex portion of the substrate and the paint discharge width be the same between 3.5 and 15 cm. The following table illustrates the relationship between these conditions and the paint discharge width when a Nordson nozzle and airless pump (1:20) are used.

[0014]

[Table 1]

In the present invention, the pressure of the paint supply system in a pressurized state, that is, the pressure for feeding the paint is 2-10.
Although the range of 0 kg / cm ² can be used, when the pressure is low, the ejection stability tends to be lacking. When the pressure is high, the spray paint droplets are scattered, and the boundary around the coating becomes unclear. I have to be. Therefore, the pressure for feeding the paint is 3-4.
It is preferably in the range of 0 kg / cm ² .

A feature of the first aspect of the present invention is that when controlling and painting a predetermined convex surface defined on a surface of a substrate through a groove, data for control painting is stored in a computer in advance. The control signal from the computer is converted into a drive signal for opening and closing the on-off valve in the paint pressure feeding path, the on-off valve is operated, and the discharge and stop of the paint from the individual airless spray nozzles directly connected to the on-off valve. Is to control.

In the coating method according to the first aspect of the present invention, a plurality of airless spray nozzles are arranged in the width direction of the conveyor, or a row of airless spray nozzles arranged in the width direction of the conveyor is arranged before and after in the moving direction of the conveyor. In multiple rows. When a plurality of airless spray nozzle rows arranged in the width direction of the conveyor are arranged before and after in the moving direction of the conveyor, the following advantages can be obtained.

(I) The minimum stop time between the discharge, the stop, and the re-discharge of the coating material is at least 0.2 due to mechanical restrictions.
Seconds are required. However, when the transfer speed of a substrate having a large number of square convex portions partitioned on the surface by a groove is increased, the paint discharge stop time is synchronized with the passage time of the moving groove at such a time. It becomes impossible to do so, and unpainted portions of the projections will occur. However, by arranging a plurality of airless spray nozzle rows arranged in the width direction of the conveyor, for example, two rows before and after in the moving direction of the conveyor, for example, two airless spray nozzles are arranged so that every other airless spray nozzle has a square convex shape. It is only necessary to paint the surface of the part, so that it is possible to increase the transfer speed of the substrate. (Ii) By applying one color of paint from a group of airless spray nozzle rows and another color of paint from another group of airless spray nozzle rows, the convex portion can be multicolored.

In the coating method according to the second aspect of the present invention, a plurality of airless spray nozzles are arranged in the width direction of the conveyor. This arrangement number is preferably the maximum number of rows of the surface of the convex portion defined by the groove, which appear in the short side width direction of the substrate. In each of the nozzles, the coating is started when the front end of the substrate enters the coating region by the nozzle, and the coating is stopped immediately before the rear end of the substrate exits the coating region by the nozzle. During this time, the control signal is used to periodically or continuously switch to a specific supply system among paint supply systems having different color tones. Can be arbitrarily painted so as to differ from each other.

A feature of the second embodiment of the present invention is that all of the supply systems of a plurality of paints having different colors which are in a pressurized state are provided.
It is to connect to individual airless spray guns via individual switching devices that can be selectively switched to a specific supply system among those supply systems. As such a switching device, for example, as described in Utility Model Registration Publication No. 2510411, a supply system for a plurality of paints having different color tones in a pressurized state is provided with a valve for controlling the supply of the paint. Is connected to one paint mixing unit that receives the supply of the paint through the mixing unit and supplies the paint to the coating gun from the mixing unit. However, in the present invention, such a supply device is not necessarily used. It is not limited to a device. For example, it is connected to an airless spray gun via a plurality of open valves of a paint supply system in a pressurized state, one of the plurality of supply valves is opened, and the other is closed. Next, a paint supply system switching device that repeats an operation of closing an open valve and opening a closed valve may be used.
In the present invention, for example, by controlling each switching device independently and periodically to switch the paint supplied to the airless spray gun, for example, the time during which one square convex portion passes under the nozzle is reduced. A) coating each convex surface with a different color tone and texture, or b) having two or more types of convex surfaces with different surface color and texture, and switching between them. The surface of each convex portion can be painted so as to be randomly present in the painted plate, and furthermore, the individual switching devices are each independently controlled for the time during which one rectangular convex portion passes under the nozzle. C) by changing the paint supplied to the airless spray gun at a time interval shorter than or equal to the time corresponding to the time, and by changing the paint supplied to the airless spray gun. Painted and individually partially tone and texture even at the surface of the protrusion can be painted each of the projections surface differently on.

Another feature of the second aspect of the present invention is that a switching device is provided for applying a paint of a different color to the surface of each of the projections defined on the surface of the substrate via the groove. It is controlled by a timer or a control signal from a computer. That is, data for control coating is stored in a computer in advance, or a time is set in a timer, and a control signal from the computer or a control signal from the timer is used as a drive signal for opening and closing a valve in the paint pressure feeding path. , And operate the valve to switch the specific paint to the individual airless spray guns while appropriately selecting and switching to a specific supply system among the multiple paint systems of different colors in the pressurized state. The purpose of the present invention is to control the type of paint supplied and discharged from each airless spray nozzle, and the discharge and stop of paint.

In general, the stop time between the stoppage and the re-discharge of the paint of the airless spray nozzle needs to be at least about 0.2 seconds due to mechanical restrictions. However, when the transfer speed of a substrate having a large number of rectangular convex portions partitioned on the surface via the groove is increased, it is not possible to synchronize with the passage time of the moving groove at such a time of the paint discharge stoppage. It becomes possible, and the unpainted portions of the convex portions occur. However, as described above, in the coating method of the present invention, the discharge of the paint from the nozzle is continuously performed from the leading end of the substrate to the trailing end, and the supplied paint fluctuates periodically. It is possible to follow a section. However, the paint cannot be switched instantaneously, but the paint is mixed at the time of switching and the color tone gradually changes at the boundary of the switching. There is a feature that can express a subtle color change within one tile.

The paint used in the airless spray of the present invention may be any of various types of conventionally known colored paints such as organic solvent-based paints such as baking type, air-drying type and active energy ray-curable type, water-based and solvent-free paints. It may be. Further, a transparent or translucent colored clear paint in which the lower colored coating film is visible may be used. It is also possible to form a coating film having a brilliant or interference feeling by blending colored particles in the paint to make it colorful, or by blending metal powder or mica powder. Further, it is also possible to form minute irregularities by mixing an aggregate.

In the present invention, the paint film may be used as it is as a top coat film, but it is also possible to apply a clear paint on the entire surface of the paint film for the purpose of adjusting the surface finish appearance and ensuring durability. it can. The clear paint that can be used in the present invention is a transparent or translucent clear paint or a colored clear paint, and as the clear paint,
Any type of conventionally known various clear coatings such as an organic solvent type such as a baking type, a normal drying type, and an active energy ray-curing type, an aqueous type, a non-solvent type, and a powder can be usefully used.

Further, these clear coatings may be used by mixing matting agents, pigments, various beads, metal powders, ceramic powders and the like in such an amount that the coating surface of the projections is not hidden. These clear paints can be applied using a known coating machine such as an air spray, an airless spray, a flow coater, a roll coater, and an electrostatic coating machine. Regarding the application time of the clear paint, the convex paint surface may be in an undried state or after drying.

Next, the present invention will be described with reference to FIGS. FIG. 1 is a plan view of a coated plate obtained by the coating method of the present invention, and FIG. 2 is a perspective view of a part of the coated plate of FIG. As shown in FIGS. 1 and 2, the coating plate 1 includes a groove 3 provided on the surface of a rectangular substrate 2, and a large number of rectangular protrusions 4 partitioned in a brick-like manner through the groove 3. Have
The surface of each convex portion 4 is painted in several different colors and textures, for example, a dark color tone convex portion 5, a slightly dark color tone convex portion 6, a slightly light color tone convex portion 7, and a light color tone convex portion 8. , And the convex portions of these color tones are present at random. The painted plate 1 having such a color tone and texture has an appearance similar to a stack of real bricks and the like when constructed in a building, and is a painted plate excellent in design.

An example of the coating method of the first embodiment of the present invention for obtaining the above-described coated plate 1 will be described with reference to FIGS. FIG. 3 is a partially cutaway schematic front view for explaining an example of the first embodiment of the present invention, and FIG. 4 is a right side schematic side view of a part thereof. Reference numeral 12 denotes a conveyor for transporting the substrate 11 forward. An airless spray gun 14 having a nozzle at a tip is disposed above the conveyor 12 over the entire width of the conveyor 12. The airless spray gun 14 is connected to a pump 17 for feeding a paint 16 in a paint tank 15 via a control valve 13 for discharging and stopping the paint. FIG. 5 illustrates the details of one system of such an airless spray device, but the embodiment of the present invention is not limited to such a device.

Reference numeral 19 denotes a valve control unit for individually controlling the control valves 13 for executing the discharge and stop of the paint from the airless spray gun 14. Reference numeral 21 denotes pattern data recording a color tone pattern corresponding to a color tone to be painted, 22 denotes a computer which issues a control signal to a valve control device 19 based on the input pattern data 21, 23 denotes a light projector 24 and a light receiving device. The photodetector 25 is a photoelectric tube sensor provided at predetermined positions on both sides of the substrate transport path on the conveyor 12, and transmits a detection signal to the computer 22. 26 is a drive roll 27 of the conveyor 12
The encoder is connected to the minimum rotation angle, for example, 2
A pulse is transmitted to the computer 22 at each minimum rotation angle of 360/000 degrees.

When the coating method according to the first embodiment of the present invention is carried out using the apparatus shown in FIGS. 3 and 4, the substrate 11 having the convex portions 4 on the surface and the underlayer coating film formed in advance is used. Is transported on the conveyor 12, the sensor 23 detects that the front end of the substrate 11 has reached a predetermined position, and transmits a detection signal to the computer 22. Meanwhile, conveyor 1
Along with the operation 2, pulse is transmitted to the computer 22 from the encoder 26 provided on the drive roll 27. The computer 22 starts counting the pulses based on the signal from the sensor 23, and when the number of pulses reaches a set area stored in advance, the computer 22 sequentially outputs a control signal based on the pattern data 21 of the color tone pattern according to the number of pulses. A transmission command is sent to the control device 19, whereby the valve control device 19 individually controls the opening / closing of the paint opening / closing control valve 13. When the paint 16 is opened, the airless spray gun 14
The nozzles are ejected to predetermined positions on the surface of the substrate 11 being conveyed, and the tones 4 to 8 based on the pattern data 21 are applied to the projections 4 to obtain an intended substrate.

When various colors are applied to the substrate to give different color tones and textures, as shown in FIG. 6, the same airless spray gun groups 32, 33 arranged in the width direction of the conveyor 31 as described above. 34 are arranged in a plurality of rows before and after the moving direction of the conveyor, paints having different finish colors are supplied to the respective airless spray gun groups 32, 33, and 34 in the same manner as described above.
The paints having different color tones are discharged from 33 and 34, respectively, and the convex portions 4 on the surface of the substrate 11 which are advanced on the conveyor 31
Multi-color painting, the expected convex color tone 5, 6, 7, 8
Can be obtained.

An example of the coating method according to the second embodiment of the present invention for obtaining the coated plate 1 as described above will be described with reference to FIG. FIG. 7 is a partial front view schematically showing the overall arrangement for describing an embodiment of the second aspect of the present invention. As shown in FIG. 7, the substrate 11 is transported forward by the conveyor 12, and an airless spray gun 14 having a nozzle at the tip is disposed above the conveyor 12 over the entire width of the conveyor 12. ing. The airless spray gun 14 has a control valve 13 for discharging and stopping the paint.
And a pump group 17A for pumping the plurality of paints 16A, 16B, 16C in the plurality of paint tanks 15A, 15B, 15C,
17B and 17C are connected via a paint switching device 18. As the paint switching device 18, a device described in Japanese Utility Model Registration No. 2510411 can be used.

Reference numeral 19 denotes a control device for individually controlling the control valve 13 for executing the discharge / stop of the paint from the airless spray gun 14 and the paint switching device 18. Reference numeral 21 denotes pattern data which records a color tone pattern corresponding to a color to be painted, 22 denotes a computer which issues a control signal to a control device 19 based on the input pattern data 21, and 23 denotes a projector 2
4 and a photodetector 25 are provided at predetermined positions on both sides of the substrate transport path on the conveyor 12, and transmit detection signals to the computer 22. 26 is an encoder connected to the drive roll 27 of the conveyor 12,
A pulse is transmitted to the computer 22 at every minimum rotation angle, for example, every 360/2000 minimum rotation angle.

When the coating method of the present invention is carried out using the apparatus shown in FIG. 7, the substrate 11 having the convex portions 4 on the surface and the underlayer coating film formed in advance is conveyed on the conveyor 12. Then, the sensor 23 detects that the front end of the substrate 11 has reached a predetermined position, and transmits a detection signal to the computer 22. On the other hand, along with the operation of the conveyor 12, a pulse is transmitted to the computer 22 from the encoder 26 provided on the drive roll 27. Computer 2
2 starts counting the pulses according to the signal from the sensor 23, and when the number of pulses reaches a preset area stored in advance,
A control signal based on the pattern data 21 of the color tone pattern is sequentially transmitted to the control device 19 according to the number of pulses, whereby the control device 19 causes the individual paint opening / closing control valve 1
3 and the individual paint switching devices 18 are individually controlled to open and close so that the individual paints 16A, 16B or 16C are at predetermined positions on the surface of the substrate 11 being conveyed from the individual airless spray guns 14 when the individual control valves 13 are opened. The projected color is applied to the projections 4 based on the color data 5 to 8 based on the pattern data 21 to obtain a desired coated plate.

In the coating method of the present invention, the lower coating film formed on the convex portion of the substrate is applied with an airless spray while it is not dried, and is used with the coating material used for the lower coating film and the airless spray. Surface tension, affinity,
It is also possible to add various patterns such as a rainbow pattern, a zigzag pattern, and a hammerton pattern by adjusting characteristics such as a drying speed and adding an additive such as a silicone resin. In addition, if the surface of the lower coating film formed on the convex portion of the substrate is subjected to printing or the like in advance by a printing means such as direct printing or transfer printing, a composite pattern is further formed and a unique appearance can be obtained. Furthermore, in the coating method of the present invention, it is also possible to discharge the paint from the airless spray nozzle and apply a spatter coating to add a spot pattern while the coating film is not yet dried or after it is dried. It is.

[0035]

As described above, in the coating method according to the first aspect of the present invention, an airless spray nozzle and a spray nozzle whose paint discharge width is approximately equal to the surface width of a rectangular projection on a substrate are provided. It is used in combination with a control signal from a computer that controls the discharge and stop of the paint from the substrate, so that the color tone and texture of the surface of the convex portion of the substrate in which the lower layer coating having a different color tone is formed in advance in the groove portion and the convex portion are previously formed. Protrusion surfaces of two or more types, each having a different color tone, are randomly present in the substrate, and the substrate having excellent durability can be painted with a simple device that is easy to maintain and inspect individual nozzles. .

Further, in the coating method according to the second aspect of the present invention, an airless spray nozzle having a paint discharge width substantially matching the surface width of the rectangular projection of the substrate is used, and a plurality of pressurized states are used. Since the supply systems of paints with different colors are connected to individual airless spray guns via individual switching devices that can switch while appropriately selecting a specific supply system among those supply systems, it is used. On the surface of the substrate having a large number of rectangular protrusions partitioned on the surface by a groove, and on the grooves and the protrusions, a lower layer coating film having a different color tone is formed in advance on the surface of the protrusions of the substrate, and the nozzles of the individual nozzles. Using a simple airless spray device that is easy to maintain and inspect, it is possible to apply a coating plate having different color tone and texture on the surface of each convex portion and having excellent durability.

[Brief description of the drawings]

FIG. 1 is a plan view of a substrate obtained by a coating method of the present invention.

FIG. 2 is a perspective view of a part of the substrate of FIG. 1;

FIG. 3 is a partially cutaway schematic front view for explaining an example of an embodiment of the present invention.

4 is a right side schematic side view of a portion of the embodiment shown in FIG.

FIG. 5 is a schematic explanatory view illustrating the details of one system of the airless spray device.

FIG. 6 is a partial right side schematic view for explaining another example of the embodiment of the present invention.

FIG. 7 is a partially cutaway schematic front view for explaining an example of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coated board 2 Substrate 3 Groove part 4 Square convex part 5-8 Convex part painted in various colors 11 Substrate 12 Conveyor 13 Control valve 14 Airless spray gun 15, 15A, 15B, 15C Paint tank 16, 16A, 16B , 16C paint 17, 17A, 17B, 17C pump 18 paint switching device 19 control device 21 pattern data 22 computer 23 photoelectric tube sensor 24 light transmitter 25 light receiver 26 encoder 27 drive roll 31 conveyor 32 airless spray gun 33 airless spray gun 34 airless spray gun

Claims (9)

[Claims] 1. A substrate having a large number of square projections partitioned on a surface by grooves, wherein the projections are arranged in a plurality of rows in the width direction of the substrate, and the grooves and the projections are provided. In the method of coating the surface of each convex portion while transporting a substrate on which a lower layer coating film having a different color tone is formed in advance by a conveyor, the paint discharge width is increased above the substrate by the surface of the convex portion. A plurality of airless spray nozzles having a width substantially equal to the width are arranged in the width direction of the conveyer, and control of discharge and stop of paint from each airless spray nozzle by a control signal from a computer is performed to control a predetermined convex surface of the substrate. A coating plate having two or more types of color tone on each convex surface and convex surfaces having different color tones randomly present in the substrate. 2. The method according to claim 1, wherein a plurality of rows of airless spray nozzles arranged in the width direction of the conveyor are arranged before and after in the moving direction of the conveyor, and paint is discharged from each of the airless spray nozzle rows. A method for coating a substrate according to claim 1. 3. A method of arranging a plurality of rows of airless spray nozzles arranged in the width direction of the conveyor before and after in the moving direction of the conveyor, and discharging a paint having a different color tone from each airless spray nozzle row to perform multicolor coating. 3. The method for coating a substrate according to claim 1, wherein the substrate is coated. 4. A substrate having a large number of rectangular projections partitioned on a surface by grooves, wherein the projections are arranged in a plurality of rows in the width direction of the substrate, and the grooves and the projections are provided. In a method of coating the surface of each convex portion with a different color while transporting a substrate on which a lower layer coating film having a different color tone is formed in advance by a conveyor, a coating material substantially matching the surface width of the convex portion A plurality of airless spray nozzles having a discharge width are arranged above the substrate in the width direction of the conveyor, and all of the supply systems of the plurality of paints having different color tones in a pressurized state are connected to the supply systems. Connected to individual airless spray guns via individual switching devices that can be switched while appropriately selecting a specific supply system, and controlling each individual switching device independently to perform airless spraying Changing the paint to be supplied to the emissions discharged paint from airless spray nozzle, the method for coating a substrate, which comprises coating the surface of the protrusion of the each different color tones, respectively. 5. The method according to claim 5, wherein each of the switching devices is independently controlled to change the paint supplied to the airless spray gun, thereby providing two or more types of convex surfaces having different surface tones and having the same in the coated plate. 5. The method for coating a substrate according to claim 4, wherein the surface of each of the convex portions is coated so as to be present at random. 6. The switching devices are each independently set to 1
By continuously changing the paint supplied to the airless spray gun by controlling every time shorter than the time corresponding to the time when each square convex portion passes under the nozzle or continuously controlling the paint, 6. The substrate according to claim 4, wherein the surfaces of the respective convex portions are painted in different colors, and the surfaces of the respective convex portions are painted so that the color of each convex portion is also partially different. Painting method. 7. The method according to claim 4, wherein the switching device is controlled by a timer or a control signal from a computer. 8. An airless spray nozzle having a paint discharge width of 3 to 20 cm is used.
8. The method for coating a substrate according to any one of items 7 to 7. 9. The method for coating a substrate according to claim 1, wherein a clear paint is further applied to the coated surface of the coated substrate.