JPH1147680A - Method for coating substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method which forms microruggedness on the surfaces of many square-shaped projecting parts segmented via groove parts on a front surface and coats this surface so as to finish the front surfaces of the square- shaped projecting parts to respective different color tones. SOLUTION: The entire front surface of the substrate having the many square-shaped projecting parts segmented via the groove parts on the front surface is coated with a colored coating material (a). Only the projecting part surfaces are then coated with a colored coating material (b) different in the color tone from this colored coating material (a) and while the coating films of the colored coating material (b) are still not dried, aggregate is sprayed to the coating films and is fixed to the projecting part surfaces. While the resulted substrate is transported by a conveyor, the discharge and stop of the colored coating material (c) from individual airless spraying nozzles are controlled by control signals from a computer and the prescribed projecting part surfaces are coated, by which the respective projecting part surfaces formed with the microruggedness are coated to the respective different color tones.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming fine irregularities on the surface of a large number of rectangular projections partitioned on the surface by grooves, and making the surfaces of the rectangular projections have different colors. The present invention relates to a coating method for finishing a three-dimensional pattern with a natural feeling, such as a brick pattern, a tile pattern, a masonry pattern, etc., by applying a finish.

[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, which allows easy maintenance and inspection of individual nozzles, on the surface of the convex part, on which a coating film with a different color tone is formed and the aggregate is fixed to form minute irregularities, is used. It is an object of the present invention to provide a method of coating so that a coated plate having a different surface tone and texture and having excellent durability is obtained.

[0006]

Means for Solving the Problems The inventors of the present invention have made intensive studies to achieve the above object, and as a result, have formed an aggregate on the surface of a square convex portion of a substrate to form fine irregularities, By using a combination of an airless spray nozzle whose discharge width substantially matches the surface width of the rectangular convex portion of the substrate and a control signal from a computer that controls the discharge and stop of the paint from the spray nozzle, the above object is achieved. Is achieved, and using an airless spray nozzle having a paint discharge width that substantially matches the surface width of the square convex portion of the substrate,
Through individual switching devices that can be switched while appropriately selecting a supply system of a plurality of paints having different color tones in a pressurized state to a specific supply system among those supply systems,
By connecting and using the individual airless spray guns, it has been found that the above-mentioned object is preferably achieved by controlling the switching device by a timer or a control signal from a computer, and has arrived at 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 first step of applying a colored paint (a) to the entire surface of the substrate arranged in a plurality of rows in the direction, and a second step of applying a colored paint (b) having a color tone different from that of the colored paint (a) only to the surface of the convex portion. The two steps, the third step of spraying the aggregate onto the coating film while the coating film of the colored paint (b) is not dried and fixing the aggregate on the surface of the convex portion, and the first to third steps are obtained. While transporting the substrate by a conveyor, 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 above the substrate, and a control signal from the computer is provided. Color paint (c) from each airless spray nozzle (C) The colored coating (a), it is different from paint color from the colored coating (b). A) coating the colored paint (c) on the surface of the predetermined convex portion by controlling the discharge and the stop of the above-mentioned process, and by the various processes, the color tone of the surface of each convex portion having the minute unevenness is two or more. And a coated plate in which convex portions having different color tones are randomly present in the substrate.

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 first step of applying a colored paint (a) to the entire surface of the substrate arranged in a plurality of rows in the direction, and a second step of applying a colored paint (b) having a color tone different from that of the colored paint (a) only to the surface of the convex portion. The two steps, the third step of spraying the aggregate onto the coating film while the coating film of the colored paint (b) is not dried and fixing the aggregate on the surface of the convex portion, and the first to third steps are obtained. While transporting the substrate by the conveyor, 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 above the substrate, and are in a pressurized state. All of the respective supply systems of the colored paint (c) having a plurality of different tones are replaced with a specific one of the supply systems. The individual paints are connected to individual airless spray guns via individual switching devices that can be switched while appropriately selecting the supply system, and the individual paints are supplied to the airless spray gun by independently controlling the individual switching devices. c) is changed to discharge the colored paint (c) from the airless spray nozzle, and includes a fourth step of coating the colored paint (c) on the surface of a predetermined convex portion.
It is characterized in that the surfaces of the respective convex portions on which the fine irregularities are formed are painted in different colors.

[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 square convex portions partitioned on the surface via a groove portion, and the convex portions are arranged in a plurality of rows in the width direction of the substrate '', Slate board, wood chip cement board, pulp cement board, asbestos cement board, lightweight aggregate-mixed cement board, foam concrete board, glass fiber reinforced cement board, calcium silicate board, magnesium carbonate board whose board is used for exterior wall material or interior material Plate, or other inorganic substrates such as hydraulic plate materials, and cold-rolled steel plates, stainless steel plates, aluminum plates, copper plates, etc., as well as zinc, zinc-based alloys, aluminum,
Various metal plates, such as plated steel plates plated with chromium, nickel or their alloys. Many square convex portions (one tile) partitioned on the surface through grooves by embossing or cutting grooves Or bricks or stones), and the convex portions are arranged in a plurality of rows in the width direction of the substrate and provided with a square convex pattern such as a brick tone, a tile tone, or a stone masonry tone. It is. Further, in the present invention, "different in color tone" means that there is a difference in hue, light and darkness, shade, presence / absence of gloss, and the like, and that there is a difference in appearance.

In the present invention, as a first step, the entire surface of the substrate is coated with a coloring paint (a) which is to be the finished color of the groove by means such as airless spraying. In the present invention, the substrate is reinforced before the colored paint (a) is applied, rainwater or the like is prevented from entering the substrate, or the colored paint (a) or a colored paint (b) described later is applied. A primer may be applied to improve the adhesion of the film.
Next, as a second step, only the surface of the convex portion of the substrate having the coating film of the colored paint (a) formed on the entire surface is subjected to the finishing color of the convex portion.
The color paint (b) which becomes a color is applied by means such as a roll coater. Note that the colored paint (b) is a paint having a different color tone from the colored paint (a) in order to finish the groove portion and the convex portion with different colors.

Next, as a third step, while the coating film of the colored paint (b) is not dried, the aggregate is sprayed on the whole coating film or partially so as to adhere to the coating film. The attached aggregate hardens as the coating film of the colored paint (b) is hardened, and forms fine irregularities made of the aggregate on the surface of the convex portion. As the aggregate, various known aggregates such as a light-transmitting aggregate, a light-impermeable aggregate, a colored aggregate or an aggregate made of a mixture thereof can be used. The shape of the aggregate is not particularly limited, such as a spherical shape, an irregular shape, or a flat shape. Also,
The particle size of the aggregate is suitably from 20 to 2000 μm, preferably from 50 to 500 μm, from the viewpoint of the visibility of the fine irregularities and the fixing strength. Specifically, silica sand, ceramic powder, mica powder,
Typical aggregates include metal powder, resin powder, calcium carbonate powder, talc powder, clay powder, glass powder and the like. In this way, the aggregate is fixed to the surface of the convex portion, and the non-fixed aggregate existing in the groove and the like is removed by suction removal or removal by spraying a pressurized gas.

Next, in a fourth step, while the substrate obtained in the first to third steps is conveyed by a conveyor, a colored paint (c) is applied to the surface of a predetermined convex portion by the following method. In the fourth step, 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 fourth step is known. In a normal airless spray method, a paint discharge width (generally called a spray pattern width) is 7.5 to 7.5.
Those having a size of 60 cm are generally used.
Frequent use of 7 to 48 cm.

On the other hand, the feature of the present invention is that the paint discharge width is adjusted by appropriately selecting various conditions such as the nozzle diameter, the nozzle shape, the distance between the nozzle tip and the substrate, the paint viscosity, and the discharge pressure. The width is approximately equal to the surface width of the square convex portion, preferably 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 .

The feature of the fourth step of the first aspect of the present invention is that
When controlling and coating the surface of the predetermined convex portion defined on the surface of the substrate via the groove, data for control coating is stored in a computer in advance, and a control signal from the computer is transmitted to the paint feeding path. An object of the present invention is to convert a drive signal for opening and closing a certain on-off valve, operate the on-off valve, and control the discharge and stop of paint from each airless spray nozzle directly connected to the on-off valve.

In the coating method in the fourth step of 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 provided. It is implemented by arranging a plurality of rows before and after the moving direction. 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 of the fourth step of 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, by the control signal, by periodically or continuously switching to a specific supply system of the supply system of the paint having a different color tone, the square convex portion,
It is possible to arbitrarily paint so that the color tone is different from the adjacent convex portion and the appearance is different.

The feature of the fourth step of the second aspect of the present invention is that
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. Connecting to an airless spray gun. 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. Through
A supply device or the like connected to one paint mixing unit that receives the supply of the paint and supplies the paint to the coating gun from the mixing unit is known, but the present invention is not necessarily limited to such a device. Not something. 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 fourth step of the second aspect of the present invention is that a coating of a different color is applied to the surface of each of the projections defined on the surface of the substrate through the groove. , The switching device 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.

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 forms minute irregularities (not shown) by the aggregate, and is coated with several different color tones and textures, for example, a dark color tone convex portion 5, a slightly dark color tone convex. It has a portion 6, a slightly light color tone convex portion 7, and a light color tone convex portion 8, and these color tone convex portions 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 according to 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 omitted schematic front view for explaining an example of an embodiment of the fourth step of the first aspect of the present invention,
FIG. 4 is a schematic right side view of a part thereof. 12 is the substrate 1
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. The paint 16 in the paint tank 15 is supplied to the airless spray gun 14 through a control valve 13 for discharging and stopping the paint.
Pump 17 is connected. 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 device for individually controlling the control valves 13 for executing the discharge / 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 of the fourth step of the first embodiment of the present invention is carried out by using the apparatus shown in FIGS. 3 and 4, the lower layer having the projections 4 on the surface and fixing the aggregate is fixed. When the substrate 11 on which the coating film is formed in advance is conveyed 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. 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. The computer 22 starts counting the pulses by the signal from the sensor 23,
When the number of pulses reaches a set area stored in advance, a control signal based on the pattern data 21 of the color tone pattern is sequentially transmitted to the valve control device 19 in accordance with the number of pulses, whereby the valve control device 19 Open / close control valve 1
3 is individually opened and closed, and when the control valve 13 is opened, the paint 16 is discharged from the nozzle of the airless spray gun 14 to a predetermined position on the surface of the substrate 11 being conveyed, and the color tone 5 to 8 based on the pattern data 21 is projected. The desired substrate is obtained by painting the part 4.

When various colors are applied to the substrate to give different colors and textures, as shown in FIG. 6, the same airless spray gun groups 32, 33, which are arranged in the width direction of the conveyor 31, respectively. 34 are arranged in a plurality of rows before and after in the moving direction of the conveyor, and paints having different color tones are supplied to the respective airless spray gun groups 32, 33, and 34 in the same manner as described above.
By discharging paints having different color tones from 3 and 34,
Multi-color coating is performed on the projections 4 on the surface of the substrate 11 that is advanced on the conveyor 31, and the coated plate 1 having the desired projection 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 above-described coated plate 1 will be described with reference to FIG. FIG. 7 is a partially cutaway schematic front view showing an overall arrangement for describing an embodiment of a fourth step 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 plurality of paint tanks 15A, 15B, 15
Pump groups 17A, 17B, 17C for pumping a plurality of paints 16A, 16B, 16C in C 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 unit 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 unit 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 fourth step of the present invention is carried out using the apparatus shown in FIG. 7, the coating of the colored coating (a) and the coating of the colored coating (b) are performed in the first to third steps. When the substrate 11 on which the film is formed and the aggregate is fixed is conveyed on the conveyor 12, the sensor 23 detects that the front end of the substrate 11 has reached a predetermined position, and outputs a detection signal to the computer 2.
Send to 2. 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 22
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, the pattern data 2 of the color tone pattern according to the number of pulses.
1 to the control device 19 to transmit a control signal based on
As a result, the control device 19 individually controls the opening and closing of the individual paint opening / closing control valves 13 and the individual paint switching devices 18 so that the individual paints 16A, 16B or 16C
At the time of opening, the individual airless spray guns 14 discharge the ink to a predetermined position on the surface of the substrate 11 being conveyed and apply the colors 5 to 8 according to the pattern data 21 to the convex portions 4 to obtain the desired coated plate. Can be

The coated plate thus obtained can be further coated with a (color) clear coating on the entire surface, if necessary, for the purpose of adjusting the finished appearance and ensuring durability. In addition, the primer, the colored paint (a), the colored paint (b), and the colored paint (c) used in the present invention.
The clear paint may be any type of conventionally known various paints such as an organic solvent-based paint, a water-based paint, and a solvent-free paint such as a bake-curable paint, a cold-curable paint, and an active energy ray-curable paint. In addition, these paints may be mixed with colored granules, metal powder, mica powder, etc. in the paint within a range that does not deviate from the purpose of each paint to make the paint colorful, and to form a coating film having a brilliant feeling or interference feeling. It is possible.

[0032]

As described above, in the coating method according to the first aspect of the present invention, in the fourth step, the airless spray nozzle in which the paint discharge width substantially matches the surface width of the rectangular projection of the substrate. And a control signal from a computer that controls the discharge and stop of the paint from the spray nozzle, so that a lower layer coating film having a different color tone is previously formed on the groove and the protrusion, and an aggregate is formed on the surface of the protrusion. The surface of the convex portion of the substrate on which the fine irregularities are formed has two or more colors and textures, and the surface of the convex portion having a different color tone is randomly present in the substrate, and the coated plate is excellent in durability. Maintenance and inspection of individual nozzles is easy and can be performed with simple equipment.

Further, in the coating method according to the second aspect of the present invention, in the fourth step, an airless spray nozzle having a paint discharge width that substantially matches the surface width of the rectangular projection of the substrate is used, Connected to individual airless spray guns via individual switching devices that can switch the supply system of a plurality of paints having different color tones to a specific one of the supply systems as appropriate. Since it is used, a lower layer coating film having a different color tone is formed in advance on the groove and the convex portion of the substrate having a large number of rectangular convex portions partitioned via the groove portion on the surface, and an aggregate is formed on the convex portion surface. Using a simple airless spray device that allows easy maintenance and inspection of the individual nozzles, the surface of the convex portion of the substrate on which the fine irregularities are formed is different in color tone and texture from the surface of the individual convex portion and has excellent durability. It can be coated so that the coated sheet having a three-dimensional feeling is.

[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 a fourth step 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 schematic right side view for explaining another example of the fourth embodiment of the present invention.

FIG. 7 is a partially cutaway schematic front view for explaining an example of an embodiment of a fourth step 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 (6)

[Claims] 1. A substrate having a large number of rectangular projections partitioned on a surface by grooves, wherein the projections are colored on the entire surface of the substrate arranged in a plurality of rows in the width direction of the substrate. A first step of applying the paint (a), a second step of applying a colored paint (b) having a different color tone from the colored paint (a) only to the surface of the convex portion, and a coating film of the colored paint (b) being undried A third step of dispersing the aggregate on the coating film and fixing the aggregate on the surface of the convex portion, and a step in which the substrate obtained in the first to third steps is transported by a conveyor, In addition, a plurality of airless spray nozzles whose paint discharge widths substantially match the surface width of the projections are arranged in the width direction of the conveyor, and the coloring paint (c) [c] from each airless spray nozzle is controlled by a control signal from a computer. However, the colored paint (c) is the same as the colored paint (a) and the colored paint (b). Color tone is different paint. A) coating the colored paint (c) on the surface of the predetermined convex portion by controlling the discharge and the stop of the above-mentioned process, and by the various processes, the color tone of the surface of each convex portion having the minute unevenness is two or more. And obtaining a coated plate in which convex portions having different color tones are randomly present in the substrate. 2. A method in which 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, and the colored paint (c) is discharged from each of the airless spray nozzle rows for painting. Claim 1
The method of coating the substrate described. 3. 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 colored paint (c) having a different color tone is discharged from each airless spray nozzle row. 3. The method for coating a substrate according to claim 1, wherein the coating is performed. 4. A substrate having a large number of rectangular projections partitioned on a surface through grooves, wherein the projections are colored on the entire surface of the substrate in a plurality of rows arranged in the width direction of the substrate. A first step of applying the paint (a), a second step of applying a colored paint (b) having a different color tone from the colored paint (a) only to the surface of the convex portion, and a coating film of the colored paint (b) being undried A third step of dispersing the aggregate on the coating film and fixing the aggregate on the surface of the convex portion, and a step in which the substrate obtained in the first to third steps is transported by a conveyor, In addition, a plurality of airless spray nozzles having a paint discharge width substantially matching the surface width of the convex portion are arranged in the width direction of the conveyor, and each of a plurality of colored paints (c) having a different color tone under a pressurized state is supplied. Since all of the systems are switched while appropriately selecting a specific supply system among those supply systems, Connected to the individual airless spray guns via the individual airless spray guns, and the individual airborne spray nozzles are controlled independently of each other to change the color paint (c) supplied to the airless spray gun. A fourth step of discharging the colored paint (c) and applying the colored paint (c) on the surface of the predetermined convex portion, and coating the surface of each convex portion having the fine irregularities in a different color tone by the various steps. A method for coating a substrate, comprising: 5. A color paint (c) supplied to an airless spray gun by independently controlling each switching device.
5. The method according to claim 4, wherein two or more types of convex surfaces having different surface color tones are provided, and each of the convex surfaces is painted such that they are randomly present in the coating plate. The method of coating the substrate described. 6. The switching devices are each independently set to 1
The color paint (c) supplied to the airless spray gun is continuously changed at a time shorter than the time corresponding to the time when each square convex portion passes under the nozzle or continuously and continuously. The method according to claim 4, wherein the surface of each of the convex portions is painted in a different color tone, and the surface of each of the convex portions is painted so that the color tone is partially different even on each individual convex surface. 6. The method for coating a substrate according to 5.