KR20030036014A - Multicolored shape painting equipment and multicolored shape painting method - Google Patents

Abstract

PURPOSE: To provide an equipment and a method for multicolor pattern coating by which a uniform multicolor pattern coating film is formed by spray coating in high speed coating such as coil coating. CONSTITUTION: In the coating equipment for forming the multicolor pattern coating film by applying ≧2 color coating materials on a belt like material to be coated moving at ≧10 m/min possesses a coating apparatus in which a plurality of spray coaters each having ≧2 coating material discharge nozzles are fixed to a coater supporting body, each coating material spray nozzle is arranged to face the material to be coated and ≧2 colored coating materials having different colors from each other are discharged from at least 2 coating material discharge nozzles of each spray coater, and a coating material supply apparatus for supplying ≧2 colored coating materials stored in separated tanks to each coating material discharge nozzle of each spray coater through a pump and a local ventilation apparatus for collecting the coating material dust produced in the spray coating are provided.

Description

Multi-shape painting equipment and multi-shape painting method {MULTICOLORED SHAPE PAINTING EQUIPMENT AND MULTICOLORED SHAPE PAINTING METHOD}

TECHNICAL FIELD This invention relates to the colorful paint installation and the colorful paint method which can form the uniform colorful paint film by spray coating also in high speed painting, such as coil coating.

Conventionally, when spray-coating a moving object to be painted, the spray gun is reciprocated in a large width direction in the width direction of the moving object to be coated so that the coating trajectory has a large zigzag shape. Therefore, when the moving speed of the coated object is increased to 4 m / min or more in general, an uncoated portion occurs in the coated object and a variation in the thickness of the coated film is increased.

In the case of forming a multicolored pattern on the object to be coated, it is particularly necessary to reduce the variation in the thickness of the coating film because the variation in the shape is remarkable due to the variation in the thickness of the coating film. It is also possible to increase the reciprocating speed of the spray gun to eliminate the occurrence of unpainted parts and variations in the thickness of the coating film.However, when the reciprocating speed is increased, the linearity of the paint particles varies greatly depending on the size of the paint particles discharged from the nozzle. There is a problem that disturbance occurs in the shape pattern.

By solving the above problems, the present applicant, in Japanese Unexamined Patent Application Publication No. 2000-296357, uses a method of forming a multicolored shape excellent in flatness by spray coating in high-speed coating such as coil coating, that is, Two or more spray paint sprayers having two or more paint ejection nozzles are used to eject the paints of different paints from two or more paint ejection nozzles of each spray coating device, and a unit color spray containing different paints is mixed. A plurality of patterns are formed, and spray coating is performed such that a part of each unit multicolor pattern formed by the plurality of unit multicolor spray patterns in the workpiece overlaps with the unit multicolor pattern formed by the adjacent unit multicolor spray pattern. Suggested way.

This problem can be solved by this method, but in actual coating lines, there are problems such as reproducibility of shapes due to variation in discharge amount of each painting and dust scattering by air atomization coating.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a multi-color coating facility and a multi-color coating method which can form, by spray coating, a multi-color coating film having excellent plastering property with respect to a belt-like object moving at high speed. .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of a colorful painting installation showing one embodiment of the present invention.

2 is a conceptual diagram showing a paint supply method and a cleaning system for use in the present invention.

Fig. 3 is a conceptual diagram of the arrangement of each spray coating machine and the resulting pattern in the coating equipment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: painting device

2: paint feeder

3: local exhaust device

4: cleaning device

5: painting device automatic transfer rail

6: strip-shaped coating material

7: roll cotta

8: flexible hose

9a to 9c: doc

10: cleaning solvent pressure pump

11: air hose for cleaning solvent pipe cleaning

12: air hose for cleaning paint pipe

13: cleaning nozzle

50a to 50e: spray sprayer

51: sprayer support

The present invention,

1. A facility for spray coating two or more colors of paint onto a band-shaped workpiece moving at a speed of 10 m / min or more to form a colorful coating film, wherein the painting facility includes a plurality of sprays having two or more paint discharge nozzles. A coating device, a separate tank, in which a sprayer is fixed to a sprayer support, the paint discharge nozzles are disposed toward the surface to be coated, and the paints of different paints are discharged from two or more paint discharge nozzles of the respective spray paint machines. And a paint supply device for supplying two or more colors of paints stored in the paint to each of the paint ejection nozzles of the spray sprayer, and a local exhaust device for capturing the paint dust generated during the spray painting. Colorful shape painting equipment,

2. The painting equipment described in 1, which spray-paints the plural spray sprayers while simultaneously reciprocating a short distance in the same direction;

3. The coating equipment according to item 1 or 2, wherein each spray coating machine is a multi-nozzle spray gun having two or more paint discharge nozzles adjacent thereto;

4. The painting equipment according to any one of items 1 to 3, wherein the painting device is an automatic transfer type that moves forward when painting the designated surface of coating and retreats when painting is finished;

5. The painting equipment according to item 1, wherein the paint supply device adjusts the discharge amount adjustment from the nozzles of the various paints to the paint flow rate in the paint supply path;

6. The painting equipment described in 1, which is provided with a cleaning device for automatically cleaning each paint supply path and each spray coating machine,

7. The coating equipment according to any one of items 1 to 6, wherein each apparatus is installed so that addition or exclusion is possible without reshaping the coating line in the coating line of the strip-shaped workpiece moving at a speed of 10 m / min or more,

8. A multicolored coating method for forming a multicolored coating by spray coating two or more colors of paint on a band-shaped workpiece moving at a speed of 10 m / min or more using the coating equipment according to any one of items 1 to 7,

9. The coating method according to item 8, wherein the strip-shaped coating is a strip-shaped metal plate on which a primary coating film is formed;

10. The coating method according to item 8, wherein the strip-shaped coating is formed on a strip-shaped metal plate with a primary coating film and a coloring base coating film sequentially on the primary coating film.

11. Coating method of 9 or 10 in which primary coating film and colored base coating film are formed by roll coat coating,

12. The coating method according to 10 or 11, wherein the colored base coating film and the colorful coating film are formed in a wet wet state.

13. It is providing the colorful-shaped coating-formed coating board obtained by the colorful-shaped coating method in any one of 8-8.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described using drawing. 1 is a schematic diagram of a multi-color painting equipment showing one embodiment of the present invention, FIG. 2 is a conceptual diagram showing a paint supply method and a cleaning system for use in the present invention, and FIG. It is a conceptual diagram of the arrangement | positioning of each spray coating machine in and the pattern obtained.

In Fig. 1, 1 denotes a coating device, 2 a paint supply device, 3 a local exhaust device, 4 a cleaning device, 5 a coating device automatic transfer rail, 6 a belt-shaped coating material, and 7 a roll coater. The strip-shaped to-be-coated 6 is a primary coating or coloring protective coating by roll coat 7.

In the painting device 1, a plurality of spray painters 50a to 50e having two or more paint ejection nozzles are fixed to the paint supporter 51, and each paint ejection nozzle is coated with the paint 6 to be coated. Each spray coater 50a-50e is arrange | positioned toward the surface, and the paint of a different paint is discharged from two or more paint discharge nozzles of each spray coater 50a-50e.

As a spray coating machine 50a-50e provided with two or more paint discharge nozzles used in this invention, a multi-nozzle spray gun, a multihead spray gun, a rotary atomizer, etc. are mentioned, for example.

The multi-nozzle spray gun is a sprayer having one paint gun head in the sprayer and the paint gun head having two or more paint discharge nozzles in close proximity. It is preferable to discharge the paint of different colors from each paint discharge nozzle of the multi-nozzle spray gun to form a color spray pattern in which different paints are mixed.

As a multi-nozzle spray gun, the spray gun of Unexamined-Japanese-Patent No. 9-299833 is mentioned, for example. The position of the nozzle of the multi-nozzle spray gun may be in a position where paints of different colors discharged from each nozzle can be mixed and a paint layer having a uniform shape can be formed on the workpiece. For example, two or more nozzles It may be arranged independently, and each nozzle may be integrally arranged concentrically, and an inner nozzle and an outer donut-shaped nozzle may be formed.

In each spray gun, it is good to adjust the grade which mixes paint particles by changing the arrangement | positioning of each paint discharge nozzle a, b, c, d. That is, it is good to make the mixing degree of the paint particles discharged | emitted from each paint discharge nozzle close to the grade which can contact each paint discharge nozzle members. When the paint discharge nozzles are separated from each other, the mixing degree of the paint particles is reduced. Although the distance between each paint discharge nozzle is not specifically limited, Usually, it is suitable that the distance between paint discharge nozzles exists in the range of 15 mm or less, Preferably it is 10 mm or less, More preferably, it is 5 mm or less.

When there are three or more paint ejection nozzles of the multi-nozzle spray gun, the paint of different colors may be ejected from each paint ejection nozzle, and only the required number of nozzles (for example, two of four nozzles) may be used. You may spray paint of a different color.

On the other hand, the multi-head spray gun is equipped with two or more coating gun heads in the coating machine, and each coating gun head has one paint discharge nozzle, as disclosed in, for example, Japanese Patent Laid-Open No. 12-84479. The nozzle is not close. Facing each paint ejection nozzle (two or more in total) of each paint head of the multi-head spray gun toward the object to be coated, and applying a spray pattern of paint particles of different colors ejected from the two or more paint ejection nozzles to the surface to be coated. By forming a multi-color spray pattern in which two or more different colors of paint are mixed, the multicolored coating film can be formed. In addition, the direction of each nozzle of the two air spray guns is intersected before each spray pattern is applied to the surface to be coated to form a multi-color spray pattern, and to position and fix it so as to form a multi-color coating film on the object to be coated. It is recommended to operate it like a multihead spray gun.

The spray sprayers 50a to 50e illustrated in FIG. 1 are multi-nozzle spray guns having four paint discharge nozzles in close proximity. In the present invention, spray coating is preferably performed by short-term reciprocating movement of the spray sprayers 50a to 50e in the same direction at the same time.

The coating device 1 having the spray sprayers 50a to 50e is installed on the automatic transfer rail 5, and when the coated object 6 is painted, the rail is advanced to move the coated object 6 It is arranged so as to be coatable, and at the end of painting, it retracts along the rail and moves away from the object to be coated 6. After the retreat, it is possible to wait until the next coating is cleaned or changed color of the spray gun.

The local exhaust device 3 captures paint dust generated during spray painting by the coating device 1. The ducts 9a to 9c that suck paint dust are mainly disposed on both sides of the moving workpiece 6 and the coating surface of the workpiece 6. The paint dust sucked into the ducts 9a to 9c by the driving of an exhaust fan (not shown) is exhausted through the flexible hose 8.

The paint supply device 2 supplies A-color and B-color paints stored in separate tanks to four paint ejection nozzles of the respective spray painters 50a to 50e via a pump. The paint supply device 2 has a specification for adjusting the final discharge amount adjustment from the nozzles of the A and B color paints to the paint flow rate in the paint supply path, in order to ensure the reproducibility of the shape caused by the variation in the discharge amount of each paint. And this is shown in FIG. FIG. 2 shows a case where only two nozzles of each of the multi-nozzles are used for two sprayers of the spray sprayers 50a to 50e to simplify the explanation.

In Fig. 2, the A color paint filled in the A color paint tank is circulated through the three-way valve by the metering pump, and the B color paint filled in the B color paint tank is also circulated through the three-way valve by the metering pump. . These paints are changed in flow paths by the respective three-way valves and are transferred to the respective color change valves, and are then supplied to the respective paint discharge nozzles of the respective spray guns. The flow path change and the flow rate from the metering pump of each three-way valve are controlled by a controller (shown). In each metering pump, a gear pump driven by an AC servo motor capable of controlling the rotation speed by an inverter (not shown) is used. By this gear pump, the paint flow volume value of each three-way valve is adjusted, and the final discharge amount adjustment from the discharge nozzle of each color paint is ensured by this. Thereby, color fluctuation etc. by the discharge amount fluctuation in each discharge nozzle can be controlled, and shape expression property can be adjusted.

In the present invention, as shown in Fig. 1, it is preferable to include a cleaning device 4 for automatically cleaning each paint supply path and each spray coater. It is desirable to automatically clean each paint supply path and each spray coater before the time limit of the gun contamination to prevent paint spits from being generated by contamination of the spray gun body by continuous atomization. The cleaning device 4 sends the cleaning solvent pumped from the cleaning solvent pressure pump 10 to the cleaning nozzle 13 through the cleaning solvent supply pipe to remove contamination of the spray gun body, and again, blows air for cleaning solvent piping. Transfer drying is carried out via the cleaning air hose 11 and the paint pipe atomization air hose 12. In the supply path and the cleaning system of the nozzle, as shown in FIG. 2, the cleaning solvent filled in the cleaning solvent tank is transferred to each color change valve by a pressure pump, and is supplied to each paint discharge nozzle of each spray gun. The washing is performed, and again, the air for blowing is supplied to each of the color change valves and the respective paint discharge nozzles and dried. The liquid supply or air by the pressure pump is controlled by a controller (not shown).

In the coating equipment of the present invention configured as described above, each device is freely added or excluded from the existing or new coating line of the strip-shaped coating material moving at a speed of 10 m / min or more without changing the coating line. desirable. Thereby, even in the coating line in coil coating etc., there is no disassembly of equipment.

In the method of the present invention, two or more colors of paint are spray coated using the above coating equipment on a strip-like object moving at a speed of 10 m / min or more, preferably 20 to 120 m / min. The coated paint is hardened by baking in a drying furnace to form a colorful paint film.

Using the above-mentioned spray coating machine, two or more colors of paints are discharged from two or more paint discharge nozzles of a spray gun equipped with two or more paint discharge nozzles. As a result, a color spray pattern in which the paints discharged from the nozzles are mixed is formed. The mixing degree of the paint in the spray pattern may be determined according to the desired shape within the range in which the multi-color coating film can be formed, and can be adjusted by appropriately adjusting the coating conditions such as the paint viscosity and the discharge amount of the paint. have. It is appropriate that the viscosity of the paint during coating is usually in the range of 10 to 40 seconds by measurement at forward cup # 4 (20 ° C). The atomizing air pressure of the paint is usually in the range of 0.5 to 10 kgf / cm 2, and the pattern air pressure is usually in the range of 0.1 to 4 kgf / cm 2.

The unit color spray pattern shape from the coating machine formed as mentioned above may be round shape, elliptical shape, and is not specifically limited.

In the present invention, a plurality of unit multi-color spray patterns formed from a plurality of spray coaters are combined to form a multi-color multi-color pattern in which adjacent unit multi-color pattern patterns overlap each other. The extent to which the adjacent unit polychromatic patterns overlap each other is usually in the range of 1/6 to 1/2, preferably 1/3 to 1/2, on the line with the largest overlap between the unit polychromatic patterns. When each unit multicolor pattern is a cause, it is suitable to exist in 1/6-1/2 of the diameter, Preferably it exists in the range of 1/3-1/2). In the present invention, the size of the unit multi-color shape pattern or the multi-color shape pattern means the size of the effective spray pattern.

FIG. 3 shows a specific example of the shape pattern obtained by the spray sprayers 50a to 90e arranged in a gal. Each spray sprayer is installed in a zigzag arrangement of 250 to 300 mm in lateral pitch and about 150 mm in longitudinal pitch, and has a distance to the workpiece to about 500 mm, and each unit pattern obtained is shown in FIG. As shown, the multiples in which the unit shape patterns of the spray sprayers 50b and 50d overlap with the unit shape patterns of the spray sprayers 50a, 50c and 50e positioned in the heat transfer with respect to the direction of movement of the strip-shaped workpiece are overlapped. Form a multicolored pattern.

In addition, when forming a colorful shape on the workpiece, as shown in Fig. 3, each spray sprayer is reciprocated shortly by an arrow in the width direction of the strip-shaped workpiece by reciprocating the multi-colored pattern in the width direction of the workpiece. You may exercise. By short-distance reciprocation, it is possible to improve the uniformity of the shape.

In the present invention, in the case of forming a multicolored shape by spray coating, the formed multicolored multicolored pattern is continuously positioned to cover the entire width of the object to be coated. In the case of short-distance reciprocating spraying machine, short-distance reciprocation is performed within the range of the position where the multi-colored multicolored pattern continuously covers the whole width of a to-be-painted object.

Although the coating film thickness of the colorful pattern layer formed on the to-be-painted object is not specifically limited, Usually, it exists in the range of 2-30 micrometers, Preferably it is 10-15 micrometers by dry film thickness, The appearance and baking of the obtained coating film It is suitable from the viewpoint of preventing foaming of the coating film when the film is made.

In the method of the present invention, examples of the strip-shaped coating material include a metal plate, a coating metal plate having a primary coating film formed on the metal plate, and a colored base coating film formed on the primary coating film, if necessary, and the like. It is good to use a metal plate and a coating metal plate suitably especially.

As said metal plate, an internal combustion steel plate, a galvanized steel plate, an aluminum plated steel plate, an aluminum plate, etc. are mentioned, Especially, it is good to use a galvanized steel plate suitably. As a galvanized steel plate, a hot dip galvanized steel plate, an electrogalvanized steel plate, an iron zinc alloy plated steel plate, a nickel zinc alloy plated steel plate, an aluminum zinc alloy plated steel plate (for example, plating of a brand name "galvalium", "galuan" Steel plate) etc. are mentioned. The metal plate may be subjected to a chemical treatment such as zinc phosphate treatment or chromium treatment on the surface to improve adhesion or corrosion resistance.

In the case where the object to be coated is a coated metal plate, as the primary coating film that may be formed on the metal plate, a coating film obtained from a polyethylene primer or an epoxy resin primer is suitable, and the thickness thereof is not particularly limited, but is usually about 2 to 15 μm. It is good. As a coloring base coating film, it is preferable that it is a coating film formed from the intermediate coating film and the top coating material which are conventionally known to the coating material field as a intermediate coating film and a top coat base film. As intermediate paint and top coat, both paints, such as a polyester resin type, an alkyd resin type, an acrylic resin type, and a silicone polyester resin type, are mentioned. Although the film thickness is not specifically limited, Usually, it is good to set it as about 2-20 micrometers.

It is preferable that the said primary coating film and a coloring base coating film are formed by roll coat coating. This may be baked after coating, respectively, and a multi-color coating film may be formed in the wet wet state on the primary coating film or the colored base coating film. When a colorful coating film is specifically formed on a coloring base coating film, it is necessary to coat wet-wet even in process shortening, and you may preheat after coloring base coating as needed.

Although the baking conditions of a colorful coating film are not restrict | limited in particular, In the case of continuous coating, about 30 second-about 2 minutes are suitable normally on the conditions which set the highest achieved temperature of the to-be-coated object to 160-250 degreeC.

According to the present invention, the problem of reproducibility of the shape due to variation in the discharge amount of each paint in the actual coating line and dust scattering due to air atomization coating are solved, and excellent uniformity is achieved with respect to the belt-shaped object moving at high speed. A colorful coating film can be formed by spray coating.

Claims (13)

It is a coating equipment for forming a colorful coating film by spray-coating two or more colors of paint on a strip-shaped object moving at a speed of 10 m / min or more. The painting equipment, A plurality of spray sprayers having two or more paint ejection nozzles are fixed to the sprayer support, the paint ejection nozzles are disposed toward the surface of the object to be coated, and different paint spray nozzles from the two or more paint ejection nozzles of the respective spray coaters A painting device for discharging a paint of A paint supply device for supplying two or more colors of paints stored in separate tanks to the respective paint ejection nozzles of the respective spray sprayers through a pump; And a local exhaust device for trapping paint dust generated during the spray coating. The coating equipment according to claim 1, wherein the spray coating is performed while plural spray sprayers are simultaneously reciprocated in a short distance in the same direction. The coating equipment according to claim 1 or 2, wherein each spray coating machine is a multi-nozzle spray gun having two or more paint discharge nozzles in close proximity. The coating equipment according to any one of claims 1 to 3, wherein the painting apparatus is an automatic transfer type that moves forward when painting the designated surface of the coated object and retreats when painting is finished. The coating equipment according to claim 1, wherein the paint supply device has a specification for adjusting the discharge amount adjustment from the nozzles of various paints to a paint flow rate value in the paint supply path. The painting installation according to claim 1, further comprising a cleaning device for automatically cleaning each paint supply path and each spray paint machine. The apparatus according to any one of claims 1 to 6, wherein each device is installed so as to be able to be added or excluded without reshaping the coating line in the coating line of the strip-shaped workpiece moving at a speed of 10 m / min or more. Painting equipment characterized by the above-mentioned. The colorful coating method of forming a colorful coating film by spray-coating two or more paints to the strip-shaped to-be-moved thing which moves at speed 10m / min or more using the coating equipment as described in any one of Claims 1-7. The coating method according to claim 8, wherein the strip-shaped coating is a strip-shaped metal plate on which a primary coating film is formed. The coating method according to claim 8, wherein the strip-shaped coating is formed with a primary coating film on a strip-shaped metal plate and a colored base coating film on the primary coating film. The coating method according to claim 9 or 10, wherein the primary coating film and the colored base coating film are formed by roll coat coating. The coating method according to claim 10 or 11, wherein the colored base coating film and the colorful coating film are formed in a wet wet state. The multicolored paint-forming coating plate obtained by the multicolored coating method according to any one of claims 8 to 12.