CN100402159C - Colorful pattern coating equipment and colorful pattern coating method - Google Patents

Abstract

To provide a multi-color coating device and a multi-color coating method capable of forming a uniform multi-color coating film by spray coating even in high-speed coating such as coil continuous coating. The multi-color pattern coating equipment includes: a coating device, which is a coating device that sprays and coats two or more colors of paint on a strip-shaped object moving at a speed of 10m/min or more to form a multi-color pattern coating film. Coating equipment is to fix a plurality of spray coating machines with more than 2 paint nozzles on the coating machine support, and arrange each paint nozzle facing the surface to be coated, so that at least 2 paint nozzles of the spray coating machine Spray paint with different colors; paint supply device that supplies two or more colors of paint stored in tanks to each paint nozzle of each spray coating machine through a pump, and captures paint generated during spray coating Local exhaust for dusting.

Description

Colorful pattern coating equipment and colorful pattern coating method

technical field

The present invention relates to a multi-color pattern coating equipment and a multi-color pattern coating method that can form a uniform multi-color pattern coating film by spray coating even in high-speed coating such as coil coating.

Background technique

In the past, when spraying and coating a moving object to be coated, in order to paint the spray gun in a large reciprocating motion (reciprocating movement) in the width direction of the moving object to be coated, it is necessary to make the painting trajectory very large. Serrated. Therefore, if the moving speed of the object to be coated is increased, usually above 4 m/min, unpainted portions will be formed on the object to be coated, and there is a problem that the variation in the coating film thickness increases.

In the case of forming multi-color patterns on the object to be coated, significant pattern variations will occur due to variations in the thickness of the coating film, so it is particularly necessary to reduce the variation in the thickness of the coating film. In addition, it is considered that increasing the reciprocating speed of the spray gun will eliminate the occurrence of unpainted parts and the deviation of the coating film thickness, but there is a problem that if the reciprocating speed is increased, the straightness of the paint particles will vary with the spraying of the nozzle. There is a big difference in the size of the paint particles, which causes confusion in the pattern.

As a method to solve the above problems, the present inventor proposed in JP-A-2000-296357 Gazette a method of forming a uniform multi-color pattern with excellent aesthetics by spraying coating in high-speed coating such as coil coating, that is, , use two spray coating machines with more than two paint nozzles to spray paints of different colors from at least two paint nozzles of each spray paint device to form a plurality of units of mixed paints of different colors Multi-color spraying pattern, spraying and coating on the object to be coated, so that a part of each unit multi-color pattern pattern formed by the plurality of unit multi-color spraying patterns is more than the unit formed by the adjacent unit multi-color spraying pattern The color pattern overlaps.

Although this method can solve the above-mentioned problems, there are problems in the actual coating production line, such as the pattern reproducibility caused by the variation of the spray amount of each color and the spray powder scattering caused by air atomization coating.

The object of the present invention is to provide a multi-color pattern coating equipment and a multi-color pattern coating that can solve the above problems, and can use spray coating to form a uniform and beautiful multi-color pattern coating film for a strip-shaped object moving at high speed. installation method.

invention disclosure

The present invention provides:

1. A multi-color pattern coating equipment, which is a coating equipment that sprays coatings of more than 2 colors on a strip-shaped object moving at a speed of more than 10m/min to form a multi-color pattern coating film, characterized in that, The coating equipment has:

Fix a plurality of spray coating machines with two or more paint nozzles on the coating machine support, arrange each paint nozzle facing the surface to be coated, and let at least two paint nozzles of the spray coating machine spray colors Applicators for different paints,

A paint supply device that supplies two or more colors of paint stored in tanks to each paint nozzle of each spray coating machine through a pump, and

Local exhaust for capturing paint dust produced during this spray application.

2. The coating facility described in item 1, wherein a plurality of spray coating machines are simultaneously reciprocated in the same direction for a short distance while performing spray coating.

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 adjacent paint nozzles.

4. The painting facility according to any one of 1 to 3, wherein the painting device is a self-propelled type that advances when painting a designated surface of an object to be painted, and retreats when painting is finished.

5. The painting facility described in item 1, wherein the paint supply device has a function of adjusting the discharge amount of each color paint nozzle using the paint flow rate value in the paint supply path.

The coating equipment mentioned in Item 6.1 is equipped with a cleaning device for automatically cleaning each paint supply path and each spray coating machine.

7. The coating equipment described in any one of 1 to 6, wherein, on the coating production line for strip-shaped objects moving at a speed of 10 m/min or more, the number can be increased or decreased without rearranging the coating production line. Set up each device.

8. A method of painting colorful patterns, which uses the coating equipment described in any one of 1 to 7 to spray and coat more than 2 colors of paint on the strip-shaped object moving at a speed of 10 m/min or more, Thereby forming a colorful pattern coating film.

9. The coating method according to item 8, wherein the strip-shaped object to be coated is a strip-shaped metal plate on which the primer coating film is formed.

10. The coating method according to item 8, wherein the strip-shaped object to be coated is a metal plate in which an undercoat film is formed on a strip-shaped metal plate, and a colored undercoat film is sequentially formed on the undercoat film.

11. The coating method described in item 9 or 10, wherein the primer coating film and the colored base coating film are formed by coating with a roller coater.

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

13. A painted plate with multicolored pattern coating film, which is obtained by the multicolored pattern coating method described in any one of 8-12.

Detailed ways

Embodiments of the present invention are described below with reference to the drawings. Fig. 1 is the sketch map that shows the multi-color pattern painting equipment of one embodiment of the present invention, and Fig. 2 is the schematic diagram showing the paint supply mode and cleaning system used in the present invention, and Fig. 3 is each spraying in the painting equipment of the present invention Schematic illustration of the configuration of the coating machine and the pattern patterns obtained.

In Figure 1, 1 is the coating device, 2 is the paint supply device, 3 is the local exhaust device, 4 is the washing device, 5 is the self-feeding guide rail of the coating device, 6 is the strip-shaped object to be coated, and 7 is the roller coater . The strip-shaped object to be coated 6 should be formed by performing primer coating or coloring protection coating with a roller coater 7 .

In the coating device 1, a plurality of spray coating machines 50a to 50e having two or more paint nozzles are fixed to the coating machine support 51, and each paint nozzle is directed toward the surface to be coated 6 in a zigzag manner. Each of the spray coating machines 50a to 50e is arranged so that at least two paint nozzles of each of the spray coating machines 50a to 50e spray paints of different colors.

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

The above-mentioned multi-nozzle spray gun is a coating machine in which one coating gun head is provided on the coating machine, and the coating gun head has two or more adjacent paint nozzles. Each paint nozzle of the multi-nozzle paint spray gun sprays paints of different colors to form a multi-color spray pattern in which the paints of different colors are mixed.

As a multi-nozzle spray gun, the spray gun described in Unexamined-Japanese-Patent No. 9-299833 is mentioned, for example. The position of the nozzles of the multi-nozzle spray gun can be as long as the different-color paints sprayed by each nozzle can be mixed to form a uniform pattern paint layer on the object to be coated. For example, more than two nozzles can be independently arranged. Alternatively, the nozzles may be integrally arranged concentrically to form an inner nozzle and an outer annular nozzle.

For each spray gun, the degree of mixing of paint particles can be adjusted by changing the configuration of each paint nozzle (a, b, c, d). That is, by bringing the paint nozzle members close to each other to the extent that they can contact each other, the degree of mixing between the paint particles ejected from the paint nozzles can be increased. If the paint nozzle parts are separated from each other, the degree of mixing between the paint particles is reduced. The distance between the paint nozzles is not particularly limited, but usually the distance between the paint nozzles is 15 mm or less, preferably 10 mm or less, more preferably 5 mm or less.

When the multi-nozzle spray gun has more than 3 paint nozzles, the different-color paint can be sprayed from each paint nozzle, or only the necessary number of nozzles (for example, 2 of the 4 nozzles) can be used to spray the different-color paint.

On the other hand, the multi-head paint spray gun should be, for example, as shown in Japanese Patent Application Laid-Open No. 12-84479. There are more than two coating gun heads in the coating machine, and each coating gun head has one paint nozzle. should be close. The paint nozzles (a total of 2 or more) of each paint head of the multi-head spray gun should be directed towards the object to be painted, and the spray patterns of the different-color paint particles sprayed from the two or more paint nozzles should cross before touching the surface to be painted. , to form a multi-color spray pattern in which two or more different-color paints are mixed, thereby forming a multi-color pattern coating film. In addition, by determining and fixing the positions of the nozzles of the two air spray guns so that each spray pattern crosses before touching the surface to be coated, a multi-color spray pattern is formed, thereby forming a multi-color pattern coating film on the object to be coated , which can have the same effect as a multi-head spray gun.

The spray coating machines 50a-50e illustrated in FIG. 1 are multi-nozzle paint spray guns having 4 adjacent paint nozzles. In the present invention, these spray coating machines 50a to 50e can perform spray coating while making short-distance reciprocating motions in the same direction at the same time.

The coating device 1 equipped with the spray coating machines 50a to 50e is installed on the self-feeding guide rail 5 so that it can advance on the guide rail and coat the object 6 when the object to be coated 6 is coated. Configure, retreat along the guide rail at the end of coating, and leave the object 6 to be coated. After retreating, the spray gun can be cleaned or the color paste can be replaced until the next painting, and it can be left on standby.

The local exhaust device 3 is used to capture the paint dust generated by the above-mentioned painting device 1 when spraying and painting. The ducts 9 a to 9 c for sucking and spraying paint are mainly arranged on both sides of the moving object 6 and on the surface of the object 6 to be coated. Paint powder sucked by the ducts 9 a to 9 c is discharged through the flexible hose 8 by driving an exhaust fan (not shown in the figure).

The paint supply device 2 supplies the paints of color A and color B respectively stored in tanks to each of the four paint nozzles of the spray coating machines 50a to 50e through pumps. The paint supply device 2 has the function of adjusting the final discharge amount from each A and B color paint nozzles by using the paint flow value in the paint supply path to ensure the pattern reproducibility caused by the variation of the discharge amount of each color paint. This is shown in Figure 2. In FIG. 2 , for simplification of description, a case where only two nozzles among the multi-nozzles of the respective coating machines are used for two of the spray coating machines 50 a to 50 e is shown.

In Figure 2, the A-color paint filled in the A-color paint tank is circulated through the three-way valve with a quantitative pump, and the B-color paint filled in the B-color paint tank is also circulated through the three-way valve with a quantitative pump. These paints change their flow paths through their respective three-way valves, and are sent to the color change valves, from where they are supplied to the paint nozzles of the paint spray guns. The change of the flow path of each three-way valve and the flow rate from the quantitative pump are controlled by the controller (shown in the figure). Each fixed pump is a gear pump driven by an AC servo motor capable of controlling the number of revolutions with a changeover switch (not shown). The gear pump is used to adjust the paint flow rate value of each three-way valve, thereby ensuring the adjustment of the final discharge amount from the paint nozzles of each color. In this way, the color tone variation caused by the variation of the discharge amount in each nozzle can be controlled, and the pattern reproducibility can be adjusted.

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 may be provided. In order to prevent paint dusting due to contamination of 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 critical time when the paint spray gun is contaminated. The cleaning device 4 transports the cleaning solvent pressure-sent by the cleaning solvent pressure pump 10 to the cleaning nozzle 13 through the cleaning solvent liquid delivery pipe to remove the pollution of the main body of the spray gun, and then passes through the cleaning solvent pipe cleaning with the air hose 11 and the paint. Piping atomization uses the air hose 12 etc. to convey the air for blowing and make it dry. The cleaning system in the supply path and nozzles, as shown in Figure 2, sends the cleaning solvent filled in the cleaning solvent tank to the color change valve with a pressure pump, and then supplies it to each paint nozzle of each spray gun for cleaning. After cleaning, air for blowing is supplied to each color change valve and each paint nozzle to be dried. The liquid and air delivered by the pressure pump are controlled by the controller (pictured).

The coating equipment of the present invention constituted as described above, on the existing or newly established coating production line of the strip-shaped object moving at a speed of 10 m/min or more, it is hoped that the coating production line does not need to be rearranged. Each device can be freely increased or decreased. This eliminates the need for disassembly equipment even in coating lines such as coil coating.

In the method of the present invention, two or more colors of paint are spray-coated on a strip-shaped object moving at a speed of 10 m/min or more, preferably 20 to 120 m/min, using the above-mentioned coating equipment. The coated coating film is sintered and solidified in a drying oven, thereby forming a colorful pattern coating film.

Using the above-mentioned spray coating machine, at least 2 kinds of different-color paints are sprayed from at least 2 paint nozzles of a paint spray gun having 2 or more paint nozzles. Thus, a multi-color spray pattern in which the paint sprayed from each nozzle is mixed is formed. The degree of paint contamination in the spray pattern can be determined according to the desired pattern within the range where a colorful pattern coating film can be formed, and can be adjusted by appropriately adjusting paint viscosity, paint spraying amount and other painting conditions. The paint viscosity during painting is usually measured with a #4 Ford cup (20°C), and it is usually suitable in the range of 10 to 40 seconds. The atomization air pressure of the paint is usually in the range of 0.5-10kgf/cm ² , and the pattern air pressure is usually in the range of 0.1-4kgf/cm ² .

The shape of the unit multi-color spray pattern from the coating machine formed as described above may be circular or elliptical, and is not particularly limited.

In the present invention, a plurality of unit multi-color spray patterns formed by a plurality of spray coating machines are combined to form multiple multi-color pattern patterns in which adjacent unit multi-color pattern patterns overlap. The degree of overlapping of adjacent unit multi-color patterns is usually in the range of 1/6 to 1/2, preferably 1/3 to 1/2 of the line with the largest overlap between the unit multi-color patterns ( When the multi-color pattern of each unit is a circle, it is suitably in the range of 1/6 to 1/2, preferably 1/3 to 1/2 of its diameter). In the present invention, the size of the unit multi-color pattern and the multiple multi-color pattern means the size of the effective spraying pattern.

A specific example of the pattern obtained by the respective spray coating machines 50a to 50e arranged in a zigzag shape is shown in FIG. 3 . Each spray coating machine is set up in a zigzag pattern with a horizontal tooth pitch of 250-300mm and a vertical tooth pitch of about 150mm, with a distance of about 500mm from the surface of the object to be coated. The pattern patterns of each unit obtained are shown in Figure 3. The unit patterns formed by the spray coating machines 50a, c, and e in the front row in the moving direction of the strip-shaped coated object overlap the unit pattern patterns formed by the spray coating machines 50b, d.

In addition, when forming colorful patterns on the object to be coated, as shown in Figure 3, each spray coating machine can also be made to carry out short-distance reciprocating movement in the direction of the arrow in the width direction of the strip-shaped object to be coated (short-distance reciprocating motion ), so that multiple multi-color patterns reciprocate in the width direction of the object to be coated. By performing short-distance reciprocating movements, the uniformity of the pattern can be improved.

In the present invention, when the multi-color patterns are formed by spraying, the formed multi-color patterns are positioned to continuously cover the entire width of the object to be coated. When the coating machine is made to reciprocate in a short distance, the multiple and multi-color pattern patterns are reciprocated in a short distance within the range of positions that continuously cover the entire width of the object to be coated.

The thickness of the coating film of the multicolor pattern pattern layer formed on the object to be coated is not particularly limited. From the viewpoints of the appearance of the obtained pattern coating film and the prevention of boiling (foaming) of the coating film during sintering, etc., the dry film thickness is usually 2-2 30 μm, preferably in the range of 10 to 15 μm.

In the present invention, the strip-shaped object to be coated includes, for example, a metal plate, a coated metal plate in which an undercoat film is formed on the metal plate, and a colored undercoat film is formed on the undercoat film if necessary, and a plastic sheet. Among them, metal sheets and painted metal sheets are preferably used.

Examples of the metal sheet include cold-rolled steel sheets, galvanized steel sheets, aluminized steel sheets, and aluminum sheets, among which galvanized steel sheets are preferably used. Examples of galvanized steel sheets include hot-dip galvanized steel sheets, electric galvanized steel sheets, iron-zinc alloy-plated steel sheets, nickel-zinc alloy-plated steel sheets, aluminum-zinc alloy-plated steel sheets, (for example, trade names "Galbarium", " Galfan" plated steel sheet) and so on. In addition, in order to improve adhesion and corrosion resistance, chemical treatments such as zinc phosphate treatment and chromate treatment may be performed on the surface of the above-mentioned metal plate.

When the object to be coated is a coated metal plate, as the primer film that can be formed on the above metal plate, a coating film obtained from a polyester-based primer or an epoxy resin-based primer is preferred, and the film thickness is not particularly limited. Usually, the limit is preferably about 2 to 15 μm. The intermediate coating film and the surface base coating film as the colored base coating film may be coating films formed of conventionally known intermediate coating films and surface base coating films in the paint field. Examples of the intermediate paint and the top coat primer include polyester resin-based, alkyd resin-based, acrylic resin-based, silicone polyester resin-based paints, and the like. The film thickness is not particularly limited, but is usually preferably about 2 to 20 μm.

The above-mentioned primer coating film and colored base coating film are preferably formed by coating with a roll coater. After they are painted, they can be sintered and dried respectively, or they can form multicolor pattern coating films in a wet state on the above-mentioned primer coating film or colored base coating film. In particular, when forming a multicolor pattern coating film on a colored base coating film, it is also desirable to apply in a wet state from the viewpoint of shortening the process, and preheating may be performed after coating the colored base coating if necessary.

The sintering conditions of the colorful pattern coating film are not particularly limited. In the case of continuous coating, usually about 30 seconds to 2 minutes is suitable under the condition that the maximum temperature of the object to be coated is 160-250°C.

According to the present invention, problems such as the pattern reproducibility caused by the variation of the amount of sprayed paint of each color in the actual coating production line and the scattering of spray powder caused by air atomization coating can be solved. , It can be sprayed to form a uniform and beautiful colorful pattern coating film.

A brief description of the drawings

Fig. 1 is a schematic diagram showing a multi-color pattern coating apparatus according to one embodiment of the present invention.

Fig. 2 is a schematic diagram showing a paint supply method and a cleaning system used in the present invention.

Fig. 3 is a schematic diagram of the configuration of each spray coating machine and the obtained pattern in the coating equipment of the present invention.

Symbol Description

1 coating device

2 paint supply device

3 local exhaust

4 washing device

5 Self-feeding guide rail of coating device

6 Strips to be coated

7 roller coater

8 flexible hose

9a~c catheter

10 cleaning solvent pressure pump

11 Cleaning solvent pipe cleaning air hose

12 Air hose for paint pipe cleaning

13 cleaning nozzle

50a～e spray coating machine

51 coating machine support body

Claims (10)

1. multi-color decorative pattern coating equipment, it is the coating equipment that the coating formation multi-color decorative pattern more than spray-coating 2 looks is filmed on the banded coated article that divides above speed to move with 10m/, it is characterized in that this coating equipment has:

A plurality of spray-coating machines that will have 2 above paint spray nozzles are fixed on the coating machine support, each paint spray nozzle is disposed towards coated article face ground, make the coating of at least 2 paint spray nozzle ejection color inequalities of this spray-coating machine, the painting device that send formula certainly that when the application of appointed coated article face, advances, when application finishes, retreats

Coating more than 2 looks that are stored in respectively in the jar is supplied to paint feeding device in each paint spray nozzle of each spray-coating machine through pump,

The partial exhaust gas device that the coating that produces when being used to catch this spray-coating dusts, and

Automatically clean each coating and supply with the wash mill of pathway and each spray-coating machine.

2. the described coating equipment of claim 1 wherein, makes that a plurality of spray-coating machines are simultaneously equidirectional goes up that short distance is liftoff to move back and forth on one side, Yi Bian carry out spray-coating.

3. claim 1 or 2 described coating equipments, wherein, each spray-coating machine is the multiinjector spray gun with paint spray nozzle adjacent more than 2.

4. the described coating equipment of claim 1, wherein, paint feeding device has with coating supplies with the function that coating flow value in the pathway is adjusted the spray volume of paint spray nozzle of all kinds.

5. each described coating equipment of claim 1～4 wherein, on the paint line of the banded coated article that the speed more than dividing with 10m/ moves, does not need this paint line of layout again just can increase or reduce ground each device is set.

6. multi-color decorative pattern coating process, this method is used each described coating equipment of claim 1～5, to divide the coating more than banded coated article spray-coating 2 looks that above speed moves with 10m/, films thereby form multi-color decorative pattern.

7. the described coating process of claim 6, wherein, banded coated article is to form the strip metal plate that bottom is filmed.

8. the described coating process of claim 6, wherein, banded coated article is to form painted base coating film was filmed, formed in turn to bottom on this bottom is filmed metallic plate on the strip metal plate.

9. claim 7 or 8 described coating process, wherein, bottom is filmed, painted base coating film is to adopt the roll coater application to form.

10. claim 8 or 9 described coating process, wherein, painted base coating film and multi-color decorative pattern are filmed and are formed with damp state.

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