JP2003135998A - Equipment and method for multicolor pattern coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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. SOLUTION: 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

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor pattern coating facility and a multicolor pattern coating method capable of forming a uniform multicolor pattern coating film by spray coating even in high speed coating such as coil coating.

[0002]

2. Description of the Related Art Conventionally, when spraying a moving object to be coated, since the spray gun is reciprocated largely in the width direction of the moving object to be painted. The locus becomes a large zigzag shape. Therefore, when the moving speed of the object to be coated is increased to usually 4 m / min or more, there is a problem that an unpainted portion is generated on the object to be coated or the variation of the coating film thickness becomes large.

When a multicolor pattern is formed on an object to be coated, it is particularly necessary to reduce the variation in the coating film thickness because the variation in the pattern due to the variation in the coating film thickness becomes remarkable. In addition, it is possible to increase the reciprocating speed of the spray gun to eliminate the occurrence of unpainted parts and variations in coating film thickness.However, if the reciprocating speed is increased, the size of the paint particles discharged from the nozzle may cause There is a problem in that the straightness is greatly different and the pattern pattern is disturbed.

In order to solve the above problems, the applicant of the present invention has disclosed in Japanese Patent Application Laid-Open No. 2000-296357 that a uniform multicolored pattern excellent in aesthetic appearance is obtained by spray coating in high speed coating such as coil coating. Forming method, that is, using two or more spray coaters having two or more paint discharge nozzles, and discharging different paint colors from at least two paint discharge nozzles of each spray coater A plurality of unit multi-color spray patterns in which paints of different colors are mixed are formed, and a plurality of unit multi-color pattern patterns formed by the plurality of unit multi-color spray patterns are adjacent to each other. We proposed a method of spray painting so as to overlap the unit multicolor pattern formed by the color spray pattern.

Although the above problem can be solved by this method, in the actual coating line, there were problems such as reproducibility of the pattern due to variation of the discharge amount of each coating color and dust scattering due to air atomization coating.

An object of the present invention is to solve the above-mentioned problems and to provide a multicolor pattern coating facility and a multicolor pattern which can form a multicolor pattern coating film which is uniform and excellent in cosmetics on a belt-like object to be moved at high speed by spray coating. It is to provide a painting method.

[0007]

The present invention includes: A coating facility for spray-coating two or more colors of paint onto a strip-shaped object moving at a speed of 10 m / min or more to form a multi-colored coating film, the coating facility having a plurality of paint discharge nozzles. The spray coating machine of is fixed to the coating machine support, and the respective paint discharge nozzles are arranged facing the surface of the object to be coated,
A coating device for ejecting paints of different paint colors from at least two paint ejecting nozzles of each spray painter, and paints of two or more colors stored in separate tanks for each paint of each spray painter via a pump 1. A multicolor pattern coating facility comprising a paint supply device for supplying to a discharge nozzle, and a local exhaust device for capturing paint dust generated during the spray coating. 2. The coating facility according to 1, wherein the spray coating is performed while simultaneously reciprocating a plurality of spray coating machines in the same direction for a short distance. Each spray coating machine has two adjacent paint discharge nozzles.
3. The coating equipment according to 1 or 2, which is a multi-nozzle spray gun having four or more spray guns. 4. The coating facility according to any one of 1 to 3, wherein the coating device is a self-propelled type that moves forward when coating a designated surface of an object to be coated and retracts when coating is completed. 5. The coating facility according to item 1, which has a specification that the paint supply device adjusts the discharge amount of each color paint from the nozzle by the paint flow rate value in the paint supply path. 6. The coating facility according to claim 1, which is equipped with a cleaning device for automatically cleaning each paint supply path and each spray coating machine. 7. The coating facility according to any one of 1 to 6, wherein each device is installed in a coating line of a belt-shaped object to be coated that moves at a speed of 10 m / min or more so that the device can be added or removed without changing the coating line, Using the coating equipment according to any one of 8.1 to 7, spray-paint two or more colors of paint on a strip-shaped object that moves at a speed of 10 m / min or more to form a multicolored paint film. Pattern coating method, 9. 10. The coating method according to 8, wherein the belt-shaped article is a belt-shaped metal plate having a primer coating film formed thereon. 10. The coating method according to 8, wherein the belt-shaped article is a belt-shaped metal plate on which a primer coating film and a colored base coating film are sequentially formed on the primer coating film. 11. The coating method according to 9 or 10, wherein the primer coating film and the colored base coating film are formed by roll coater coating. The colored base coating film and the multicolor pattern coating film are formed in a wet-wet state. The coating method according to 10 or 11, and the multicolor pattern coating method according to any one of 13.8 to 12. The present invention provides a coated plate for forming a multicolored paint film.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a multicolor pattern coating facility showing an embodiment of the present invention, FIG. 2 is a conceptual diagram showing a paint supply system and a cleaning system used in the present invention, and FIG. 3 is a coating of the present invention. It is a conceptual diagram of arrangement | positioning of each spray coating machine in an installation, and the obtained pattern pattern.

In FIG. 1, 1 is a coating device, 2 is a paint supply device, 3 is a local exhaust device, 4 is a cleaning device, 5 is a self-conveying rail of the coating device, 6 is a belt-shaped article to be coated, and 7 is a roll coater. Show. The strip-shaped article to be coated 6 is one coated with a primer or colored protective coating by a roll coater 7.

In the coating apparatus 1, a plurality of spray coating machines 50a to 50e having two or more coating material discharge nozzles are fixed to a coating machine support 51, and each coating material discharge nozzle is directed toward the surface to be coated of the article 6 to be coated. The spray coating machines 50a to 50e are arranged in a staggered manner, and paints of different coating colors are discharged from at least two paint discharging nozzles of the spray coating machines 50a to 50e.

Examples of the spray coating machines 50a to 50e used in the present invention having two or more paint discharge nozzles include a multi-nozzle spray gun, a multi-head spray gun, and a rotary atomizing coating machine.

The multi-nozzle spray gun is a coating machine having one coating gun head in a coating machine, and the coating gun head having two or more adjacent paint discharge nozzles. It is possible to discharge the paints of different paint colors from the paint discharge nozzles of the multi-nozzle spray gun to form a multi-color spray pattern in which the paints of different paint colors are mixed.

As the multi-nozzle spray gun, for example,
The spray gun described in JP-A-9-299833 can be mentioned. The position of the nozzle of the multi-nozzle spray gun may be any position as long as paints of different colors discharged from the nozzles can be mixed to form a uniform pattern paint layer on the object to be coated. The nozzles may be arranged independently, or the nozzles may be arranged concentrically and integrally to form an inner nozzle and an outer donut-shaped nozzle.

In each spray gun, the degree of mixing of the paint particles can be adjusted by changing the arrangement of the paint discharge nozzles (a, b, c, d). That is, by bringing the paint discharge nozzle members so close to each other that they can come into contact with each other, the mixing degree of the paint particles discharged from the paint discharge nozzles can be increased. When the paint discharge nozzle members are separated from each other, the mixing degree of the paint particles becomes small. The distance between the paint discharge nozzles is not particularly limited, but it is suitable that the distance between the paint discharge nozzles is usually 15 mm or less, preferably 10 mm or less, and more preferably 5 mm or less.

When the multi-nozzle spray gun has three or more paint discharge nozzles, paints of different colors may be discharged from the respective paint discharge nozzles, or only a required number of nozzles (for example, four nozzles). Of the two different colors) may be used to spray different color paints.

On the other hand, the multi-head spray gun has a coating machine having two or more coating gun heads, and each coating gun head has one coating discharge nozzle, as disclosed in, for example, Japanese Unexamined Patent Publication No. 12-84479. Yes, the paint discharge nozzles are not close to each other. The paint discharge nozzles (two or more in total) of each paint head of the multi-head spray gun are made to face toward the object to be coated, and the spray pattern of paint particles of different colors discharged from two or more paint discharge nozzles is covered. It is possible to form a multicolor pattern coating film by forming a multicolor spray pattern in which paints of two or more different colors are mixed by intersecting each other before hitting the coated surface. In addition, the direction of each nozzle of the two air spray guns intersects each spray pattern before hitting the surface to be coated to form a multicolor spray pattern, so that a multicolor pattern coating film can be formed on the object to be coated. By positioning and fixing, it can function like a multi-head spray gun.

A spray coating machine 50 illustrated in FIG.
Reference numerals a to 50e are multi-nozzle spray guns having four adjacent paint discharge nozzles. In the present invention, spray coating can be performed while simultaneously reciprocating these spray coating machines 50a to 50e in the same direction for a short distance.

The coating apparatus 1 equipped with the spray coating machines 50a to 50e is installed on the self-conveying rail 5, and when coating the article 6 to be coated, the rail 6 can be advanced to coat the article 6 to be coated. And is retracted along the rail at the end of coating, and is separated from the article 6 to be coated. After the retreat, it is possible to wash the spray gun and change the color until the next painting and wait for it.

The local exhaust device 3 is for capturing paint dust generated during spray coating by the coating device 1. The ducts 9a to 9c for sucking the paint dust are mainly arranged on both side surfaces of the moving object 6 to be coated and on the coated surface of the object 6 to be coated. The paint dust sucked in the ducts 9a to 9c is exhausted through the flexible hose 8 by driving an exhaust fan (not shown).

The paint supply device 2 supplies the paints of colors A and B stored in separate tanks to the respective four paint discharge nozzles of the spray coating machines 50a to 50e via pumps. . The paint supply device 2 adjusts the final discharge amount adjustment from the nozzles of the A and B color paints by the paint flow rate value in the paint supply path in order to ensure the reproducibility of the pattern due to the change in the discharge amount of each paint color. It has specifications and is shown in FIG. In FIG. 2, in order to simplify the description, for two of the spray coating machines 50a to 50e, only two nozzles are used among the multiple nozzles of each machine.

In FIG. 2, the A color paint filled in the A color paint tank is circulated through a three-way valve by a metering pump, and the B color paint filled in the B color paint tank is also
It is circulated through a three-way valve by a metering pump. These paints are sent to the respective color change valves by changing the flow paths by the respective three-way valves, and from there, they are supplied to the paint discharge nozzles of the respective spray guns. The flow rate change from each three-way valve and the flow rate from the metering pump are controlled by a controller (illustrated). Each metering pump has
A gear pump driven by an AC servo motor whose rotation speed can be controlled by an inverter (not shown) is used. This gear pump adjusts the paint flow rate value of each three-way valve, thereby ensuring the final adjustment of the discharge amount of each color paint from the discharge nozzle. As a result, it is possible to control the tint variation due to the ejection amount variation in each ejection nozzle and adjust the pattern expression.

In the present invention, as shown in FIG. 1, a cleaning device 4 for automatically cleaning each paint supply path and each spray coating machine can be provided. In order to prevent paint spit from being generated due to dirt on the spray gun body due to continuous atomization coating, it is desirable to automatically clean each paint supply path and each spray coating machine before the time limit when the gun becomes dirty. The cleaning device 4 sends the cleaning solvent pressure-fed from the cleaning solvent pressure pump 10 to the cleaning nozzle 13 through the cleaning solvent liquid supply pipe, removes dirt on the spray gun body, and blows air to the cleaning solvent pipe cleaning air hose 11. It is sent and dried through a paint pipe atomizing air hose 12. In the cleaning system of the supply path and the nozzle, as shown in FIG. 2, the cleaning solvent filled in the cleaning solvent tank is sent to each color change valve by the pressure pump.
From here, each spray gun is supplied to each paint discharge nozzle for cleaning, and further, blowing air is supplied to each color change valve and each paint discharge nozzle to be dried. Liquid supply and air by the pressure pump are controlled by a controller (illustrated).

The coating equipment of the present invention configured as described above can be freely added to an existing or new coating line of a belt-shaped object to be coated which moves at a speed of 10 m / min or more without changing the coating line or It is desirable that each device be installed so that it can be excluded. Thus, in the method of the present invention without disassembling the equipment even in a coating line for coil coating or the like, in the method of the present invention, the two or more color paints are applied to the strip-shaped article to be moved at a speed of 10 m / min or more, preferably 20 to 120 m / min. Spray painting using painting equipment. The applied coating film is baked and cured in a drying oven to form a multicolored coating film.

Using the above spray coating machine, at least two paints having different coating colors are discharged from at least two paint discharging nozzles of a spray gun having two or more paint discharging nozzles. As a result, a multi-color spray pattern in which the paint discharged from each nozzle is mixed is formed. The mixing degree of the paint in the spray pattern may be determined according to the target pattern within the range in which the multi-color coating film can be formed, and by appropriately adjusting the coating conditions such as the paint viscosity and the discharge amount of the paint. Can be adjusted. The viscosity of the paint during painting is usually Ford Cup # 4 (20 ° C)
It is usually suitable that the measurement is performed within the range of 10 to 40 seconds. The atomization air pressure of the paint is usually 0.5-10k
It is suitable that the pressure is in the range of gf / cm 2 and the pattern air pressure is usually in the range of 0.1 to 4 kgf / cm 2.

The shape of the unit multicolor spray pattern formed by the coating machine as described above may be a perfect circle or an ellipse, and is not particularly limited.

In the present invention, a plurality of unit multicolor spray patterns formed by a plurality of spray coating machines are combined to form a multiple multicolor pattern pattern in which adjacent unit multicolor pattern patterns are overlapped. The degree of overlap between adjacent unit multicolor pattern patterns is usually 1 / on the line with the highest degree of overlap between the unit multicolor pattern patterns.
6 to 1/2, preferably 1/3 to 1/2 (when each unit multicolor pattern is a circle, 1
/ 6 to 1/2, preferably 1/3 to 1/2). In the present invention, the size of the unit multicolor pattern pattern or the multicolor pattern pattern means the size of the effective spray pattern.

Each of the spray coating machines 50a arranged in a staggered manner
A specific example of the pattern pattern obtained by 50e is shown in FIG. Horizontal spray pitch of 250-300m
m, the vertical pitch is about 150 mm, and the units are arranged in a staggered arrangement, and the distance to the surface to be coated is about 500 mm. The resulting unit pattern patterns are as shown in FIG. On the other hand, spray coating machine 5 located in the front row
The unit pattern patterns of 0a, c, and e overlap the unit pattern patterns of the spray coating machines 50b and 50d to form a multiplex multicolor pattern.

When forming a multicolored pattern on an article to be coated, as shown in FIG. 3, each spray coating machine is moved in the width direction of the belt-shaped article to be subjected to short reciprocating movement (short reciprocating movement). Alternatively, the multi-color pattern may be reciprocated in the width direction of the object to be coated. It is possible to improve the uniformity of the pattern by performing short reciprocation.

In the present invention, when forming a multicolored pattern by spray coating, the multiple multicolored pattern formed is continuously positioned to cover the entire width of the object to be coated. When performing a short reciprocating coating machine, the short reciprocating is performed within a range in which the multi-color pattern pattern continuously covers the entire width of the object to be coated.

The coating thickness of the multicolor pattern layer formed on the article to be coated is not particularly limited, but it is usually in the range of 2 to 30 μm, preferably 10 to 15 μm as a dry film thickness. However, it is preferable from the viewpoints of the appearance of the obtained patterned coating film and prevention of bubbling (foaming) of the coating film during baking.

In the method of the present invention, the strip-shaped article to be coated is, for example, a metal plate, a primer coating film on the metal plate, and if necessary, a coated metal plate having a colored base coating film formed on the primer coating film, Examples thereof include a plastic sheet, and among them, a metal plate or a coated metal plate can be preferably used.

Examples of the metal plate include a cold rolled steel plate, a zinc-based plated steel plate, an aluminum-plated steel plate, an aluminum plate and the like. Among them, a zinc-based plated steel plate can be preferably used. Examples of the zinc-based plated steel sheet include hot-dip galvanized steel sheet, electrogalvanized steel sheet, iron-zinc alloy-plated steel sheet, nickel-zinc alloy-plated steel sheet, and aluminum-zinc alloy-plated steel sheet (for example, "Galbarium" and "Galfan" Plated steel sheet). Further, the surface of the metal plate may be subjected to chemical conversion treatment such as zinc phosphate treatment or chromate treatment in order to improve adhesion and corrosion resistance.

When the article to be coated is a coated metal plate, the primer coating which may be formed on the metal plate is
A coating film obtained from a polyester-based primer or an epoxy resin-based primer is suitable, and the film thickness thereof is not particularly limited, but it is usually preferably about 2 to 15 μm. The intermediate coating film as the colored base coating film and the top coating base coating film may be a coating film formed from an intermediate coating composition or a top coating base coating conventionally known in the field of coating materials. As an intermediate coating and top coating base coating,
Examples thereof include polyester resin-based, alkyd resin-based, acrylic resin-based, and silicon polyester resin-based coating materials. Although the film thickness is not particularly limited, it is usually preferably about 2 to 20 μm.

The above primer coating and colored base coating are
It is preferably formed by roll coater coating. These may be baked and dried after coating, or a multicolored coating film may be formed on the primer coating film or the colored base coating film in a wet wet state. In particular, when a multicolored coating film is formed on the colored base coating film, it is desirable to apply it by wet wet in view of shortening the process, and if necessary, preheating may be performed after the coating of the colored base film.

The baking conditions for the multicolor pattern coating film are not particularly limited, but in the case of continuous coating, the maximum temperature to be coated is usually 160 to 250 ° C.
About 30 seconds to 2 minutes is suitable.

[0036]

According to the present invention, problems such as pattern reproducibility due to fluctuations in the discharge amount of each coating color on an actual coating line and dust scattering due to air atomization coating are solved, and a strip-shaped object to be moved at high speed is solved. Therefore, it is possible to form a uniform multicolored coating film excellent in aesthetics by spray coating.

[Brief description of drawings]

FIG. 1 is a schematic view of a multicolor pattern coating facility showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a paint supply system and a cleaning system used in the present invention.

FIG. 3 is a conceptual diagram of the arrangement of each spray coating machine and the obtained pattern pattern in the coating facility of the present invention.

[Explanation of symbols]

1 coating equipment 2 Paint supply device 3 Local exhaust system 4 cleaning equipment 5 Coating device self-conveying rail 6 band-shaped article 7 roll coater 8 flexible hose 9a-c duct 10 Cleaning solvent pressure pump 11 Air hose for cleaning solvent piping 12 Air hose for cleaning paint pipes 13 Washing nozzle 50a-e Spray coating machine 51 Coating machine support

Continued front page    F term (reference) 4D073 AA01 BB03 CA20 CB03 CC03                       DC02                 4D075 AA01 AA32 AA39 AA40 AA52                       AA65 AA71 AA85 AE21 CB36                       DA03 DB02 DB05 DB07 EA05                       EB22 EB35 EB36 EB42                 4F033 AA01 BA03 DA02 EA02 GA01                       GA11 QA01 QB03X QB18                       QE01 QF01X QF08X QF14X

Claims (13)

[Claims] 1. A coating facility for spray-coating two or more colors of paint onto a strip-shaped object to be moved at a speed of 10 m / min or more to form a multicolored coating film, the coating facility comprising a paint discharge nozzle. A plurality of spray coating machines each having two or more are fixed to a coating machine support, the respective paint discharge nozzles are arranged toward the surface of the object to be coated, and at least two paint discharge nozzles of each spray coater are different from each other. A coating device that discharges the paint of the coating color, a paint supply device that supplies two or more colors of paint stored in separate tanks to each paint discharge nozzle of each spray coating machine via a pump, and a spraying device A multicolor pattern coating facility, which is equipped with a local exhaust device that captures paint dust. 2. The coating facility according to claim 1, wherein the spray coating is performed while simultaneously reciprocating a plurality of spray coating machines in the same direction for a short distance. 3. The coating facility according to claim 1, wherein each spray coating machine is a multi-nozzle spray gun having two or more adjacent paint discharge nozzles. 4. The coating facility according to claim 1, wherein the coating device is a self-propelled type that advances when coating a designated object surface and retracts when coating is completed. 5. The coating facility according to claim 1, wherein the coating material supply device has a specification of adjusting the discharge amount of each color coating material from the nozzle by adjusting the coating material flow rate value in the coating material supply path. 6. The coating facility according to claim 1, further comprising a cleaning device for automatically cleaning each paint supply path and each spray coating machine. 7. The apparatus as set forth in any one of claims 1 to 6, wherein each device is installed in a coating line of a belt-shaped object to be coated which moves at a speed of 10 m / min or more so that the device can be added or removed without changing the coating line. Coating equipment described in paragraph. 8. A multicolored coating film obtained by spray-painting two or more colors of paint on a belt-shaped object to be moved at a speed of 10 m / min or more by using the coating equipment according to any one of claims 1 to 7. A multicolored pattern coating method to form 9. The coating method according to claim 8, wherein the strip-shaped article to be coated is a strip-shaped metal plate having a primer coating film formed thereon. 10. The coating method according to claim 8, wherein the strip-shaped article to be coated is a strip-shaped metal plate on which a primer coating film and a colored base coating film are sequentially formed on the primer coating film. 11. The coating method according to claim 9, wherein the primer coating film and the colored base coating film are formed by roll coater coating. 12. The colored base coating film and the multicolored coating film are formed in a wet-wet state.
The coating method according to 0 or 11. 13. A multicolor pattern coating film-coated plate obtained by the multicolor pattern coating method according to claim 8.