JP3373160B2 - Coating system for water-based recycled paint and color changing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating system for a water-based recycled paint and a method for changing the color thereof, and more particularly to a coating system for a water-based recycled paint and a method for changing the color of the paint which can frequently and easily change the color of the paint. .

[0002]

2. Description of the Related Art Conventionally, a work (object to be coated) is continuously transferred into a coating booth using a transfer means such as an overhead conveyor, and a paint injection device (paint nozzle) is applied to the transferred work. A coating device that performs coating using such as is widely used. At this time, mist-like uncoated paint that does not adhere to the work inside the coating booth and floats inside the coating booth is generated. It is necessary to prevent the uncoated paint from leaking to the outside of the coating booth and reattaching to the work, and it is demanded to reliably collect it.

As a means for collecting the uncoated paint, a method using an air filter or washing with water is generally used. Also recently
It has been proposed that the uncoated coating material is recovered, and if necessary, recycled processing such as filtration is performed, and the recycled coating material is reused for coating. Collection of uncoated paint is
For example, a water curtain system in which a liquid containing water as a main component (booth water) is caused to flow on the surface of a metal plate installed in a coating booth, or a water shower system using the booth water is used. After the floating uncoated paint is caught in the booth water, the booth water is guided to the booth water tank and is recycled again to the water curtain, the water shower and the like. Then, when the circulating booth water reaches a predetermined uncoated paint concentration, it is separated into a concentrated liquid (paint) and a filtrate by a UF concentrating device (filtering device) or the like. The filtrate is reused for painting, and the filtrate is reused as booth water or a booth cleaning liquid. Such paints are called water-based recycled paints.

[0004]

By the way, in recent years,
The demands for the coating color of the work are diversified, and it is required to paint different paint colors (for example, white, black, blue, etc.) on the same work. Is required. When the water-based recycled paint is sprayed in the paint booth using the paint spraying device as described above, a large amount of uncoated paint is generated, and a large amount of booth water is also used to collect it. As described above, the booth water is used for collecting the uncoated paint, and the uncoated paint collected by the booth water is filtered and toned to be used as a recycled (recycled) paint. for that reason,
When changing the coating color, it is necessary not to mix the uncoated paint before the color change and the uncoated paint after the color change. That is, it is necessary to prevent the booth water containing the individual paint colors from mixing before and after the color change. Therefore, when changing colors, it is necessary to thoroughly wash the entire coating system such as the coating booth, the circulation system of the booth water, and the UF concentrator. As a result, there has been a problem that a long time is required for the color changing work, and the frequent color changing cannot be performed.

Japanese Laid-Open Patent Publication No. 6-142573 discloses a configuration in which a booth water tank for collecting booth water and a filtering device are provided for each color used so that the color can be changed quickly and the labor for cleaning can be reduced. It is shown. However, JP-A-6-
Since the booth water circulation system piping and the like of Japanese Patent No. 142573 are shared, the length of the booth water circulation system that is the object of cleaning at the time of color change is long, and it takes a long time to complete the cleaning. Can not do it. As a result, there has been a problem that individual uncoated paints are mixed before and after the color change, and a desired color cannot be obtained when the paint is regenerated.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to make it possible to quickly and easily change the color of a water-based recycled coating material and to completely collect each color to obtain a desired color. The present invention is to provide a coating system for water-based recycled paint capable of regenerating the above-mentioned paint and a color switching method thereof.

[0007]

In order to achieve the above-mentioned object, the present invention is a coating system for water-based recycled paint capable of changing colors between different colors, which is a water-based recycled paint for a work in a coating booth. booth water circulation system which is selectively connected to the booth water to collect non-application paint generated in the spray booth in order to circulate the supply when the spray to be coated wear, selectively connected to the booth water circulation system is to transfer the to the painting booth and regeneration recycle system for reproducing an aqueous recycle paint coating containing booth water containing non-application paint concentrate and was prepared, and the filtrate generated during concentration of the regeneration recycle system as booth water anda transfer piping system, the configured liquid circulation system at the booth water circulation system and regeneration recycle system and the transfer pipe system is independently formed at least two or more series of water recycled paint color Depending the liquid circulation system is characterized in that it is selected.

According to this construction, since the water-based recycled paints having different colors are processed in completely different liquid circulation systems, the paints can be changed in color quickly and easily without mixing of the paints. be able to. Further, it is possible to completely recover the uncoated paint for each color and to regenerate the water-based recycled paint of a desired color.

In order to achieve the above object, the present invention is a method for changing the color of a paint system for a water-based recycled paint capable of changing colors between different colors, wherein the paint system for a water-based recycled paint is a work in a paint booth. the spray booth in order to circulate supplying booth water to collect non-application paint occurs when by spraying an aqueous recycled paint to paint wear against
To a selectively connect the booth water circulation system which is, with the booth water circulation system selectively coupled, said a reproduction circulatory system paint containing booth water containing non-application paint concentrate and was prepared to play an aqueous recycle paint And a transfer pipe system for transferring the filtrate generated at the time of concentration in the regeneration circulation system to the coating booth as booth water, and a liquid circulation system composed of the booth water circulation system, the regeneration circulation system and the transfer pipe system. They are independently formed at least two or more series, a said liquid circulation system according to the aqueous recycle paint colors selectable, after painting completion, color
In place, the circulation of the booth water circulation system stops, the primary concentration step of primary concentrated UF concentrator by transferring a portion of the booth water to the regeneration recycle system, the filtrate almost the same amount as the transfer was booth water From the recirculation system to the transfer piping system
Ri is supplied to the spray booth, the aqueous recycle paint adhering remaining in the paint booth by The filtrate was washed off, and inflow steps for flowing into the booth water circulation system inside, closes the booth water circulation system, a separate series booth water circulation a preparation step for the preparation of the color change paint to open the system, painting Boo
Restarted the operation and applied a different colored water-based recycled paint.
Coating step, which is a predetermined number of times , the primary concentration step, the inflow step, the preparation step, and the coating step.
And color changing coating step of performing color change coating Repeat and-up, repeated liquid circulation system blanking of the total content of the non-application paint is greater than or equal to a predetermined value by the color change coating steps performed
Against over scan water, after stopping the circulation of the coating after the completion booths water circulation system, UF transfer the whole amount of the booth water regeneration recycle system
A second step of concentrating with a concentrating device to regenerate an aqueous recycled paint.

According to this structure, since the booth water is transferred and concentrated every time the paint color is changed, the amount of cleaning liquid required for one color change can be reduced. As a result, the time and device load for one washing, transfer, concentration, etc. are reduced, and the color of the paint can be changed quickly and easily.
In addition, the booth water that is transferred intermittently is temporarily stored by primary concentration, and secondary concentration is performed when uncoated paint of a similar color is sufficiently collected in the booth water. The work can be performed quickly, and the operation efficiency of the coating system for water-based recycled paint can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention (hereinafter referred to as an embodiment) will be described below with reference to the drawings. FIG. 1 is a schematic diagram illustrating the overall configuration of a coating system 10 for a water-based recycled paint according to this embodiment. The coating booth 12 which constitutes the coating system 10 for the water-based recycled paint has a work 14 (for example,
An overhead conveyor (hereinafter, simply referred to as a conveyor) 16 that suspends and sequentially conveys electrical products, automobiles, construction materials, various other mechanical products, daily necessities, and the like is arranged.
The work 14 is carried in from the back side of the paper, subjected to coating treatment, and then carried out to the front side of the paper. Further, a paint injection nozzle 18 for spraying the water-based recycled paint in a mist state on the surface of the work 14 is arranged on the side of the work 14 conveyed by the conveyor 16. The paint injection nozzle 18 can be moved in any direction up, down, left, or right, and sprays the paint onto the entire surface on one side of the work 14 being conveyed. It should be noted that the work 1 may be rotated by rotating the work 14 or by moving the paint injection nozzle 18 upward or downward during conveyance.
The paint can be sprayed on the entire periphery of 4, and the entire back surface, top surface, bottom surface, and the like. Further, a plurality of paint injection nozzles 18 may be arranged. The water-based recycled paint is
It is a water-soluble, water-dispersible or emulsion paint that does not cure unless it is dried at a predetermined temperature, and is a paint that can be recovered by Booth water or the like, separately concentrated, prepared, and reused.

When coating with the paint spray nozzle 18, there is a mist-like paint (uncoated paint) which is sprayed from the paint spray nozzle 18 and then floats inside the coating booth 12 without adhering to the work 14. This uncoated paint may re-adhere to the work 14 after completion of coating and cause quality defects.
Conveyor 16 inside paint booth 12 and paint injection nozzle 1
Since it adheres to 8 and causes a malfunction, it is necessary to remove it as much as possible.

The coating system 10 for the water-based recycled paint of this embodiment has a paint injection nozzle 18 with a work 14 sandwiched therebetween.
The water curtain 20 for collecting the uncoated paint is formed at a position facing each other. This water curtain 20
The booth water supplied by the liquid supply nozzle 20a or the liquid supply nozzle 20b is continuously flowed along the wall surface 20c formed of a metal plate or the like to form a water film. The booth water contains water as a main component, entrains a mist-like uncoated paint, and drops downward along the wall surface 20c. In the case of the present embodiment, a mist-like uncoated paint is guided by an air flow generated by an exhaust fan, which will be described later, and efficiently collides with the water curtain 20. The liquid supply nozzles 20a and 20b preferably have a booth water supply capacity of, for example, 60 to 100 liters / minute per 1 m of the water curtain width.

An exhaust passage 22 for exhausting the air inside the coating booth 12 is formed adjacent to the coating booth 12. An exhaust fan (not shown) is provided near the outlet of the exhaust passage 22, and a filter 24 is arranged on the upstream side of the exhaust fan. By forcibly exhausting the air by the exhaust fan, an air flow is generated in the coating booth 12 to collide the uncoated paint with the water curtain 20, and at the same time, the mist-like uncoated material which cannot be collected by the water curtain 20. The paint is guided to the filter 24 and collected. Baffle plates 26 are arranged in a staggered manner on the upstream side of the filter 24 (on the inlet side of the exhaust passage 22) in order to reduce the load on the filter 24. That is, baffle plate 26
However, some of the uncoated paint is collected.

The characteristic feature of this embodiment is that even when the color of the water-based recycled paint is changed frequently, the cleaning of the system can be simplified and the color changing operation can be performed quickly, and the color mixture of the recovered uncoated paint can be mixed. The booth water circulation system that collects the uncoated paint and the recycling system that recycles the water-based recycled paint from the uncoated paint for each color or similar colors It is a separate and independent system, and the place where cleaning is required is minimized.

As shown in FIG. 1, the light booth water tank 28 and the dark color booth water tank 30 in which the booth water used in the water curtain 20 flows into the bottom of the coating booth 12 can be selectively switched by the three-way valve 32. It is located in. In this embodiment, as a classification of paints having different colors, similar colors such as a light color (for example, beige, cream, gray, etc.) and a dark color (for example, indigo, blue, black, etc.) are grouped into a group. Although an example of the color change between the colors will be described, the color classification is arbitrary, and the color may be changed between the single colors such as beige and blue.

Light color booth water tank 28 and dark color booth water tank 30
Respectively form part of a light color booth water circulation system 34 and a dark color booth water circulation system 36 that circulate the booth water and supply it to the water curtain. Further, the light-colored booth water circulation system 34 concentrates the circulating booth water at a predetermined timing to regenerate the water-based recycled paint 3
8 is connected to the dark color booth water circulation system 36 is connected to a dark color reproduction circulation system 40 that concentrates the circulating booth water at a predetermined timing to regenerate the water-based recycled paint.

Light color reproduction circulation system 38 and dark color reproduction circulation system 4
The configuration of 0 is the same, and the concentration tank 38a (40a), U
The F concentration device (ultrafiltration device) 38b (40b), the filtrate tank 38c (40c), the recycled paint recovery tank 38d (40d), and the like.

The procedure for regenerating the uncoated paint recovered in the booth water will be described by taking the light color paint as an example. After the light color coating is stopped, a predetermined amount of the booth water transferred from the light color booth water circulation system 34 to the concentration tank 38a is concentrated in the concentration tank 38a and the UF filtration device 3.
Circulate with 8b to concentrate (primary concentration). The filtrate generated at this time is discharged to the filtrate tank 38c. This primary concentration operation can be controlled by a liquid level gauge so that it automatically stops when the liquid amount in the concentration tank 38a reaches a target value. As will be described later, after some switching between light color and dark color, the total amount of booth water in the light color booth water tank 28 in which the light color uncoated paint is sufficiently collected is transferred to the concentration tank 38a. Then, by the concentration operation, the liquid concentration is concentrated to a solid content of about 40% (secondary concentration).
Then, it is transferred to the recovery tank 38d. Then, if necessary,
Toning processing is performed by a method such as CCM (color computer matching), the water-based recycled paint is regenerated, and reused for coating as a water-based recycled paint.

2 and 3 are flowcharts for explaining the color changing procedure of the coating system 10 for water-based recycled paint according to this embodiment. Figure 2 shows the painting booth 12.
FIG. 3 shows the operation of the regeneration circulatory system.

First, the coating booth 12 is started to operate with a desired paint color (for example, light beige) (S10).
0). In this case, a three-way valve 32 provided at the bottom of the coating booth 12, a switching valve 42 connecting the light color booth water circulation system 34 and the light color reproduction circulation system 38, and the light color booth water circulation system 34.
And a three-way valve 44 connecting the filtrate tank 38c and the filtrate tank 38c are controlled to form a circulation system in which the light booth water circulation system 34 is closed.
As a result, the booth water flowing into the light-colored booth water tank 28 can be continuously supplied to the liquid supply nozzle 20a of the water curtain 20 by the pump 46, and the water curtain 20 is formed on the wall surface 20c. And again, the light booth aquarium 2
Pour into 8. As described above, while the work 14 moves in the coating booth 12, the paint recycle nozzle 18 sprays a water-based recycled paint of a desired color (for example, beige) to coat the work 14, but this occurs. The unpainted coating material is collected by the water curtain 20. In addition, the water curtain 20 cannot be completely collected,
The unpainted paint floating inside the paint booth 12 is the exhaust passage 2
2 is sucked by an exhaust fan arranged in the vicinity of the outlet and is collected by the filter 24. This collecting operation is continuously performed until an instruction to change the color of the paint is issued (S101).

When the operator gives a color change instruction, first, the coating work of the coating booth 12 and the pump 46 are stopped, and the circulation of the booth water is stopped (S102). Then, it is determined whether or not the total usage period of the booth water that has collected the uncoated light-color coating material is a predetermined period (for example, two weeks) or more (S103). If the total period of use of booth water is less than the specified period, the concentration of booth water due to the collection of uncoated paint is low (for example, the solid content of the paint is between 0 and 3% by weight), and it is still used. Therefore, a portion of the booth water, specifically, the wall surface 20c forming the water curtain 20 and the filter 24 can be washed with substantially the same amount as the cleaning liquid (for example, the volume of the coating booth 12 is long). 400
When 0 mm x width 5000 mm x height 5000 mm,
200 to 300 liters) is transferred to the concentration tank 38a (S104). In this case, by controlling the switching valve 42 of a pale color booth water circulation system 34 performs transfer by driving the open pump 46 the thickening tank 38a side. The predetermined time can be determined by measuring in advance the period required for the uncoated coating material concentration in the booth water to reach about 3% by weight of the solid content.

When the transfer of the light-colored booth water is completed, the switching valve 4 for connecting the filtrate tank 38c and the light-colored booth water circulation system 34 to each other.
8 is opened and the three-way valve 44 is switched so that the filtrate tank 38c communicates with the liquid supply nozzle 20a. Further, the switching valve 52, which connects the switching valve 48 to the cleaning liquid injection nozzle 50 provided directly above the filter 24, is opened. In this state, the pump 54 is driven, and the cleaning liquid (filtrate) of approximately the same amount as the booth water previously transferred to the concentration tank 38a.
Is supplied to the liquid supply nozzle 20a and the cleaning liquid injection nozzle 50 of the water curtain 20, and the wall surface 20c of the water curtain 20 and the filter 24 are cleaned (S105).
The washing liquid (filtrate) used for washing is the light-colored booth water tank 28.
Will be collected and stored until the next use. If the cleaning liquid is also sprayed from the lower surface side of the baffle plate 26, the uncoated paint collected by the baffle plate 26 can be recovered.

Confirmation of cleaning of the wall surface 20c for the water curtain 20 and the filter 24 (cleaning with a predetermined amount of filtrate)
Then, the switching valves 48 and 52 are closed and the booth water circulation system is switched (S106). That is, the light color booth water circulation system 34 is closed and the dark color booth is used instead to collect the dark color uncoated paint that occurs when the light color paint is changed to a different color water-based paint (for example, dark blue color). The water circulation system 36 is opened. Then, returning to (S100), coating
Reboot the booth and start painting with dark water-based recycled paint.

By the way, in (S103), when it is determined that the total usage period of the booth water is a predetermined period (for example, two weeks) or more, that is, every time the color is changed, a part of the booth water (200 to 300 liters) is used. ) Is replaced by a light color booth water circulation system 34 having a predetermined concentration (for example, a solid content of 3% by weight) or more (since it is replaced every time the color is changed by the cleaning liquid, it is usually stable at about 3% by weight), The total amount of booth water (for example, 1000 liters) is stored in the light-colored booth water tank 28.
Is transferred to the concentrating tank 38a (S107). Subsequently, the entire amount of the filtrate (approximately the same amount as the transferred booth water) is supplied from the filtrate tank 38 c to the liquid supply nozzle 20 a and the cleaning liquid injection nozzle 50 of the water curtain 20, and the water curtain 20
The wall surface 20c and the filter 24 are cleaned (S10).
8). After that, the process proceeds to (S106), the booth water circulation system is switched, and coating with the dark color water-based recycled paint is started.

If the cleaning liquid (booth water) in the filtrate tank 38c is absent or insufficient due to the start-up of the new system or for other reasons, a new cleaning liquid (a mixture of water with some water-soluble solvent added) is used. ) Is prepared and used.

Further, the entire coating system 10 for water-based recycled paint of this embodiment is automatically controlled by a control unit (not shown), and when a color change instruction is input by an operator, switching of each valve and the like are automatically performed. . Therefore, in the flowchart of FIG. 2, when the color change is completed, the control unit recognizes the different color water-based recycled paint as the current water-based recycled paint. That is, until now, light colors (for example, beige) have been replaced with existing water-based recycled paints,
What has been recognized as a dark colored (eg, blue) water-based recycled paint of a different color is recognized as a current water-soluble paint. Then, in (S101), when the color change instruction is issued, the color change from the dark color to the light color (for example, the original beige or the other light color such as cream or gray) is performed by the same procedure. After that, you can change the color to dark, return to blue,
Alternatively, it can be replaced with other indigo, black, etc.

In the flow chart of FIG. 3, the concentration tank 38 is
The procedure for treating the booth water transferred to a and 40a is shown. The control unit (not shown) of the coating system 10 for the water-based recycled paint determines whether or not the transferred amount of booth water is the total amount (S200). If not, that is, the total usage period of the booth water is predetermined. If only part of the booth water is transferred in the case of the period or less, the UF concentration of the liquid in the concentration tank 38a (40a) containing the transferred booth water is almost the same as that of the transferred booth water. The device 38b (40b) is circulated for concentration (primary concentration). The filtrate generated at this time was collected in the filtrate tank 38c (40
It is sent to c) and used as the above-mentioned cleaning liquid. Then, the concentration work is stopped (S202), and the transfer of booth water by the next color change is waited for.

On the other hand, when it is judged in (S200) that the transfer of the booth water is the total amount, the UF concentrator 38b.
Concentration by (40b) is performed until the concentration becomes reusable as an aqueous recycled coating material (for example, coating solid content 40 to 50% by weight) (secondary concentration) (S203). When the liquid in the concentration tank 38a (40a) reaches a predetermined concentration, the concentration operation is stopped (S204), and the concentrated liquid is recycled into the paint recovery tank 3
It is transferred to 8d (40d) (S205). The reconcentrated liquid is subjected to toning processing by a method such as CCM (color computer matching) (S206) and is reused as a water-based recycled paint. For example, a supply tank (not shown) connected to the paint injection nozzle 18 or the like. (S207). In addition, in FIG.
Although only a base is shown, a plurality of nozzles may be installed for each coating color, or two bases for light color and dark color may be provided.

As described above, according to the present embodiment, the object of cleaning when changing colors is the coating booth 1.
2, the wall surface 20c of the water curtain 20 and only the filter 24 are not included in the booth water tank of the booth water circulation system, pipes, pumps, and the like, so that cleaning can be completed in a short time with a small amount of cleaning liquid. . Also,
Since the part which is not washed is an independent separate series, mixing of the different color paint is almost completely prevented, and the desired color can be easily reproduced when the paint is regenerated.

It should be noted that in the case of the present embodiment, two of light color and dark color are used.
I showed an example of changing the color of the group, but if necessary,
3 or more series of circulation system consisting of booth water circulation system for collecting uncoated paint and recycled circulation system for recycling water-based recycled paint from uncoated paint (eg red, blue, yellow, etc.) It may be provided. Further, in the present embodiment, the classification by the similar colors is performed, but an independent booth water circulation system or a reproduction circulation system may be formed for each single color (for example, white, red, blue, yellow, black, etc.). In this case, the reconcentrated liquid becomes almost in the same state as the original paint and can be easily reused. Further, the system shown in FIG. 1 is an example, and if the booth water circulation system and the regeneration circulation system are completely separated for each paint color, the same effect as this embodiment can be obtained with other system configurations. You can

[0032]

As described above, according to the present invention,
According to the water-based recycled paint coating system and the color changing method using the same, the booth water circulation system is independently provided in two lines or more, so when painting with a different color, It is only necessary to wash and switch the circulation system, and it is not necessary to wash the booth water circulation pipe or the booth water tank. Therefore, the amount of cleaning liquid used is small, and the cleaning time can be significantly shortened, so that the time required for color change can be reduced.

Also, since the recycle circulation system is connected to the booth water circulation system and two or more series are provided, a small amount (equivalent to the amount of cleaning liquid) sent at the end of intermittent same-color (or similar-color) coating. The booth water (for example, 200 to 300 liters) can be primarily concentrated and stored. The preparation of the water-based recycled paint can be carried out as a secondary concentration at a time when the uncoated paint is sufficiently collected in the booth water in the liquid circulation system after several color changes. Work can be performed quickly.

Furthermore, since the amount of Booth water sent to the recirculation system for each color change is small and the concentration is low, the transfer and concentration work of Booth water is quicker than the conventional total transfer and total concentration. And, it can be easily performed, and the operation efficiency of the coating system for water-based recycled paint can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating an entire configuration of a water-based recycled paint coating system according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation on the coating booth side of the water-based recycled paint coating system according to the embodiment of the present invention.

FIG. 3 is a flowchart for explaining the operation of the recycle system of the water-based recycled paint coating system according to the embodiment of the present invention.

[Explanation of symbols]

10 coating system for water-based recycled paint, 12 coating booth, 14 works, 16 overhead conveyor,
18 paint injection nozzle, 20a, 20b liquid supply nozzle, 20c wall surface, 22 exhaust passage, 24 filter, 2
6 baffle plate, 28 light color booth water tank, 30 dark color booth water tank, 32,44 three-way valve, 34 light color booth water circulation system,
36 dark color booth water circulation system, 38 light color reproduction circulation system, 3
8a, 40a concentration tank, 38b, 40b UF concentration filtration device, 38c, 40c filtrate tank, 38d, 40d recycled paint recovery tank, 40 dark color recycling circuit, 42, 48, 52
Switching valve, 46, 54 pump, 50 cleaning liquid injection nozzle.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroki Narahashi 5-5-15 Nakajima, Yodogawa-ku, Osaka City, Osaka Prefecture Japan Paint Plant Engineering Co., Ltd. (56) Reference JP-A-6-142573 (JP) , A) JP-A-9-314025 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B05B 15/00-15/12 B05C 11/10 B05D 1/02

Claims (2)

(57) [Claims] 1. A coating system for water-based recycled paint capable of changing colors between different colors, wherein uncoated paint generated when spraying the water-based recycled paint onto a work in a coating booth is applied. Selective to the painting booth to circulate supply of collecting booth water
Booth water circulation system connected, the selected linked to the booth water circulation system, wherein the regeneration recycle system for reproducing an aqueous recycle paint coating containing booth water containing non-application paint concentrate and was prepared, the regeneration recycle A transfer pipe system for transferring the filtrate generated during concentration in the system as booth water to the coating booth, and at least two or more liquid circulation systems including the booth water circulation system, the regeneration circulation system and the transfer pipe system. Formed independently ,
A coating system for water-based recycled paint, wherein the liquid circulation system can be selected according to the color of the water-based recycled paint. 2. A method for changing the color of a water-based recycled paint coating system capable of changing colors between different colors, wherein the water-based recycled paint coating system sprays the water-based recycled paint onto a work in a coating booth. Selective to the coating booth in order to circulate and supply booth water that collects uncoated paint generated when applying
Booth water circulation system connected, the selected linked to the booth water circulation system, wherein the regeneration recycle system for reproducing an aqueous recycle paint coating containing booth water containing non-application paint concentrate and was prepared, the regeneration recycle A transfer pipe system for transferring the filtrate generated during concentration in the system as booth water to the coating booth, and at least two or more liquid circulation systems including the booth water circulation system, the regeneration circulation system and the transfer pipe system. Formed independently ,
The liquid circulation system can be selected according to the color of the water-based recycled paint, and when the color is changed after painting , the circulation of the booth water circulation system is possible.
Stop ring, and primary concentration step of primary concentrated UF concentrator by transferring a portion of the booth water to the regeneration recycle system, transfer piping system the filtrate almost the same amount as the transfer was booth water from regeneration recycle system It is supplied to the paint booth by, to the filtrate
Then, the water-based recycled paint remaining on the coating booth is washed and removed, and an inflow step of flowing into the booth water circulation system is performed, and the booth water circulation system is closed and another booth water circulation system is opened to perform color change coating. Preparation step to prepare for and restart the operation of the painting booth,
A painting step of performing coating by, said primary concentration step a predetermined number of times, and inflow step, a preparation step, a color change coating step of performing color change coating by repeating the coating step, repeating said color change coating steps performed the total content of non-application paint respect booth water <br/> the liquid circulation system becomes equal to or greater than a predetermined value, it stops the circulation of paint after completion booths water circulation system by
After that, the color change of the coating system for the water-based recycled paint, which comprises the step of transferring the entire amount of the booth water to the recycle circulation system, secondarily concentrating it by the UF concentrator, and reconditioning the water-based recycled paint. Method.