JPH0146187B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic coating method, in which water-based paint is electrostatically atomized from a rotating circular edge for electrostatic coating.
An electrostatic coating method characterized by cleaning the rotating rim by continuously or intermittently supplying a solvent for dissolving the resin content of the water-based paint to the rotating rim while the paint is continuously supplied. This is related.

When painting, solvent-based paints that use large amounts of organic solvents not only cause air pollution and deterioration of the painting work environment because they volatilize large amounts of solvent into the atmosphere. Due to the finite nature of petroleum resources, resource conservation is also a major problem. Therefore, for example, in the case of painting cement tiles, switching from solvent-based paints to water-based paints, which do not use large amounts of organic solvents, is being considered, and in particular, the application of water-based paints to electrostatic painting, which has less paint loss, is being considered. . However, when performing electrostatic painting by electrostatically atomizing the paint using a rotating circular edge such as a rotating cup,
Conventionally, when water-based paints are used as paints, the following problems have occurred. That is, the rotary cup 1 for electrostatically atomizing the paint is, for example, a first rotary cup integrally provided on a pipe-shaped rotary shaft 2, as shown in FIG.
It is formed by a cylindrical body 3 and a second cylindrical body 4 fitted on the outer periphery of the first cylindrical body 3, and rotates while dripping paint from a paint supply pipe 5 inserted into the rear end of the first cylindrical body 3. The annular hollow chamber 6 between the second cylinder 4 and the first cylinder 3 is supplied with paint to the cup 1 from inside the pipe-shaped rotating shaft 2.
The system is designed to supply high-pressure air to the In this case, the paint supplied from the paint supply pipe 5 to the first cylindrical body 3 spreads in a thin film on the inner peripheral surface of the first cylindrical body 3 due to the centrifugal force caused by the rotation of the rotary cup 1, and the paint The knife edge portion 7 at the front end of the first cylindrical body 3 is pushed forward by the inner peripheral taper of the body 3.
It is supplied in the form of a thin film. Here, the paint is electrostatically atomized under the action of a high electric field caused by a high voltage applied to the rotating cup 1. On the other hand, the high pressure air supplied to the annular hollow chamber 6 is transferred between the tip of the first cylinder 3 and the second cylinder 4.
An annular cylindrical jet air stream is ejected from the gap 8 with the outer periphery, and this annular cylindrical jet air surrounds the atomized paint to prevent the atomized paint from scattering in unnecessary directions. . Here, if a water-based paint is used as the paint, the boiling point of the water-based paint cannot be controlled because the dispersion medium is water, and the paint is applied to the inner circumferential surface of the first cylinder 3 and the outer circumferential surface of the knife edge portion 7 where the paint is thinned. As a result, the paint dries, and a dry film 9 of paint is formed on the rotating cup 1 as shown in FIG. 1. This dry film 9 covers the knife edge portion 7, reducing the efficiency of electrostatic atomization of the paint. In addition, the dried film 9 adhering to the outer circumferential surface of the knife edge portion 7 causes the annular shape of the jet airflow ejected from the gap 8 to spread outward, causing a problem that the annular coating pattern regulated by the jet airflow is disturbed. This dry film 9 is generated significantly because the rotary cup 1 is rotating at a high speed, and the thin film of paint comes into contact with air more easily. It is easy to occur. Also, when using emulsion paint as water-based paint,
Since the dry film 9 is not redissolved in the emulsion paint supplied later, the dry film 9 is likely to accumulate and there is a risk that operation will become impossible in a short period of time. As described above, it is difficult to use water-based paints for electrostatic coating using a rotating circular edge such as a rotating cup.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an electrostatic coating method that can perform painting without fear of drying even if a water-based paint is used. be.

The present invention will be explained in detail below with reference to Examples. Reference numeral 1 denotes a rotating cup made of metal such as aluminum that atomizes paint using static electricity and sprayed air, and the main body is formed by a pipe-shaped rotating shaft 2, a first cylindrical body 3, and a second cylindrical body 3. There is. A female threaded portion 12 is provided at the rear end of the pipe-shaped rotating shaft 2, and a male threaded portion 13 at the tip of a relay pipe shaft 51 formed of metal is connected to the female threaded portion 1.
2 and connect the pipe-shaped rotating shaft 2 to the relay pipe shaft 9.
are connected. A disk-shaped base body 14 is integrally provided at the tip of the pipe-shaped rotating shaft 2, and the hollow part 15 tip of the pipe-shaped rotating shaft 2 is closed by the front wall of the base body 14, so that the pipe-shaped rotating shaft 2 is The first cylindrical body 3 is integrally provided around the outer end of the coaxial base body 14. The first cylindrical body 3 has an inner peripheral surface whose diameter gradually increases in a tapered shape toward the front and back of the base body 14, and
The rear inner circumferential surface of the base 14 of the cylinder 3 and the front inner circumferential surface of the base 14 refer to the plurality of tunnel portions 10 provided in the base 14.
The tunnel portions 10 are formed at equal intervals in the circumferential direction at the outer peripheral end of the base body 14. Furthermore, a knife edge portion 7 is formed at the tip of the first cylinder 3 by making the taper slope of the inner circumferential surface of the first cylinder 3 steeper, and a knife edge part 7 is formed on the outside of the first cylinder 3 in a coaxial manner. The second cylindrical body 4 is fitted therewith so that the second cylindrical body 4 can move back and forth relative to the first cylindrical body 3. Also, the first cylindrical body 3 and the second cylindrical body 4
When the second cylindrical body 4 is in a position where the tips of the first cylindrical body 3 and the second cylindrical body 4 are aligned,
The inner circumferential surface of the tip is in contact with the first cylinder 3, and the second
The second cylinder 4 is moved relative to the first cylinder 3 by moving the cylinder 4.
When the position is moved backward, the outer circumferential surface of the first cylindrical body 3 and the first cylindrical body 4 form a tapered relationship such that the gap 8 between the outer circumferential surface of the first cylindrical body 3 and the inner circumferential surface of the distal end of the second cylindrical body 4 gradually widens. The inner circumferential surfaces of the two cylindrical bodies 4 have each other. Base body 14
A suitable number of communication holes 18 are provided radially outward from the hollow part 15 of the pipe-shaped rotating shaft 2, and are formed between the outer peripheral surface of the first cylinder 3 and the inner peripheral surface of the second cylinder 4. The annular hollow chamber 6 is connected to the hollow portion 15 of the pipe-shaped rotating shaft 2 through the communication holes 18 . 5
1 is a paint supply pipe that supplies water-based paint to the rotary cup 1, and the paint is caused to flow down from the tip 5a onto the rear inner peripheral surface of the base 14 of the first cylinder 2; It is connected to a paint supply section 23 consisting of a pump, a paint tank, etc., and paint is continuously supplied. Note that when a highly conductive paint such as a water-based paint is used as the paint, the paint supply section 23 should be insulated with high voltage resistance. Reference numeral 17 denotes a fixed cylinder fixed on the front surface of the air motor 19 coaxially with the motor shaft 20, and a bearing cylinder 2 is provided at the tip of the fixed cylinder 17.
1 is arranged, and inside the bearing cylinder 2 there are two bearings 22, 22 and these bearings 22,
A metal portion 24 between 22 and 22 is disposed, and the rear end of a relay pipe shaft 51 is connected to the tip of the motor shaft 20 via a joint 25. The relay pipe shaft 51 has a hollow portion 26 whose rear end is closed,
A through hole 27 that opens to the outer peripheral surface of the relay pipe shaft 51 is communicated with the rear end of the hollow portion 26 . The through hole 27
An annular groove 28 is formed on the inner peripheral surface of the metal part 24 corresponding to the opening 27a, and a connecting hole 29 is formed in the annular groove 28.
High pressure air is fed into the annular groove 28 from a high pressure air generation source 31 through an air tube 30 connected to the rear end of the connecting hole 29, and further from the annular groove 28 to the relay pipe shaft 51 and the pipe-shaped rotating shaft. The high-pressure air introduced into the hollow parts 15 and 26 of the first cylinder 3 is introduced into the annular hollow chamber 6 through the communication holes 18 of the base 14, and the annular cylindrical jet air flow is introduced from the annular hollow chamber 6 into the first cylinder 3.
It is designed to be sent forward along the outer circumferential surface of. Further, a terminal screw 32 provided on the bearing sleeve 21 is connected to a lead wire 32 whose one end is connected to a high voltage generation source 33.
This is for connecting the other end, and a high voltage is applied between the metal conveyor 11 and the rotating cup 1. A plurality of electrostatic coating devices having the above-mentioned configuration are arranged at an appropriate angle above a metal conveyor 11. In this case, among the plurality of electrostatic coating devices, the rotating cups 1 are arranged so that their openings face obliquely forward and downward, and the other rotating cups are arranged so that their openings face diagonally downwardly. The metal conveyor 11 is grounded by appropriate means.

The electrostatic coating apparatus as described above is used, for example, for coating cement roof tiles, and the coating method will be specifically explained below.

First, water is added to a mixture of 1 part cement and 2 parts sand, the mixture is frozen and molded, and after curing for 10 days, it is naturally dried to obtain a cement tile 35 with a moisture content of 4 to 10%. This cement tile 35 with a moisture content of 4 to 10% is heated to 30℃ to 40℃.
The surface is preheated to remove moisture from the surface and create a surface condition that is suitable for painting. In this case, the portions other than the surface of the cement tile 35 maintain a moisture content of 4 to 10%. Here, the moisture content of the cement tile 35 is set to 4 to 10% because if it is more than 10, the adhesion of the paint will be poor, and if it is less than 4%, the suction force during electrostatic painting will be weak. As a result, the moisture content is 4
~10% cement tile 35 should be used,
After preheating the cement tile 35 with a moisture content of 4 to 6%, preferably a moisture content of 6%, the cement tile 35 is heated.
5 are conveyed side by side on a conveyor 11 in a tiled state. Here, the tiled state means that the cement tiles 35 are arranged with their ends overlapped in the same way as when actually tiling is done, and for this reason, the surface 35a, front surface 35b, and one side surface 3 of each cement tile 35 are overlapped.
5c is directly exposed to the outside. Next, rotating cup 1
The cement tiles 11 are conveyed by the conveyor 11 by applying a high voltage between the metal conveyor 11 and the metal conveyor 11.
Electrostatic painting is applied to the surface. Specifically describing the electrostatic coating method in the present invention, the paint supply section 23
Paint supply pipe 5 via paint tube 36
The paint is supplied to the tip 5a of the paint supply pipe 5.
A small amount of paint is continuously allowed to flow down onto the rear inner circumferential surface of the first cylinder 3 through the opening. On the other hand, the high-pressure air flow supplied from the high-pressure air source 31 through the air tube 30 rotates the air motor 19, thereby rotating the rotary cup 1 at a high speed. Therefore, the paint that has flowed into the inner circumferential surface of the first cylindrical body 3 is subjected to centrifugal force due to the high speed rotation of the first cylindrical body 3, and spreads to the rear inner circumferential surface of the first cylindrical body 3. It moves in a thin film shape toward the tip along the taper of the inner circumferential surface of the first cylindrical body 3, and finally passes through the tunnel portion 10 of the base body 14 and is supplied to the front inner circumferential surface of the first cylindrical body 3. Also on the front inner circumferential surface of the cylindrical body 3, it is supplied in the form of a thin film in the direction of the knife edge portion 7 along the taper while expanding in the inner circumferential direction. The paint thus formed into a thin film is supplied to the knife edge section 7, and this paint is electrostatically atomized by the action of a high electric field caused by a high voltage applied to the first cylinder 3, etc. Further, due to the action of this electric field, the atomized paint starts flying toward the cement roof tiles 35 having a moisture content of 4 to 10% on the metal conveyor 11 kept at the ground potential. On the other hand, the atomized paint is atomized by the wind pressure of the annular cylindrical jet airflow that is ejected from the gap 8 provided at the rear of the knife edge part 7 and flows in a spiral shape. The atomized paint is caused to fly in the direction of the cement tile 35 by applying speed and the action of the electric field. The atomized paint that is atomized by the synergistic effect of the high electric field and the jet airflow as described above is given an initial velocity by the jet airflow and is accelerated by the high electric field and flies in the direction of the cement tile 35. However, at the same time, the atomized paint is surrounded by the annular and cylindrical jet airflow flowing in a spiral, preventing the atomized paint from scattering in unnecessary directions, and changing the flying direction of the atomized paint. is made uniform in the direction of the object to be painted, and the surface 35a, front surface 35b, and one side surface 35 are exposed to the outside of the cement tile 35.
The atomized paint will be applied uniformly to c. In the present invention, the painting process is divided into two steps: first, an undercoat is applied using the electrostatic coating method described above;
Dry with infrared light and then apply a topcoat using the same electrostatic coating method. After drying with infrared rays, it is dried naturally.

Furthermore, in carrying out the electrostatic coating described above, a water-based paint is used as the paint. When using emulsion paint as a water-based paint, any paint such as acrylic emulsion paint, vinyl acetate emulsion paint, or styrene-butadiene emulsion paint can be used, but when used for painting cement tiles, it is difficult to It is preferable to use an acrylic emulsion paint. As the acrylic emulsion paint, acrylic ester emulsion paint, acrylic ester-styrene emulsion paint, methacrylic ester emulsion paint, methacrylic ester-styrene emulsion paint, etc. can be used. Styrene copolymer-based paints are suitable as paints for cement tiles because the styrene component improves water resistance, but on the other hand, the weather resistance slightly decreases, so styrene should be used at a ratio of 30% or less. Good. In addition, acrylic esters and methacrylic esters include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, octyl acrylate, lauryl acrylate, methyl methacrylate, ethyl methacrylate,
Propyl methacrylate, butyl methacrylate, octyl methacrylate, lauryl methacrylate, etc. can be used.

When using the above acrylic emulsion paint, the blending ratio of the paint is resin content (solid content).
The amount used is approximately 5 to 60 parts by weight, 20 to 50 parts by weight of water, 0 to 70 parts by weight of pigment, and 0.1 to 15 parts by weight of additives. An example of the formulation of this paint is as follows.

Acrylic acid ester emulsion (solid content 50%) 50 parts by weight Pigment 25〃 Additives 10〃 Wednesday 15〃 Add about 30 weight of dilution water to this and use it.

Here, as additives, pigment dispersants, antifoaming agents, film-forming aids, thickeners, preservatives, fungicides, antifreeze agents, etc. are used as necessary, and as pigment dispersants, for example, alkyl Formalin condensate of sodium naphthalene sulfonate, low molecular weight polyammonium acrylate, low molecular weight styrene-mammonium maleate copolymer, etc. can be used, and as antifoaming agents, N-octyl alcohol, tributyl phosphate, pine oil, Silicone antifoaming agents can be used, film-forming aids such as cellosolves and carbitol such as ethylene glycol monobutyl ether and ethylene glycol monoethyl ether can be used, and thickeners such as polyvinyl alcohol, methyl cellulose, Hydroxyethyl cellulose and the like can be used, as a fungicide, Super ADIT, Meltan, reverse soap Catinal CB, etc. can be used, and as an antifreeze agent, ethylene glycol, diethylene glycol, etc. can be used.

Furthermore, in the electrostatic coating, the cement tiles 35 are painted while the rotating cup 1 is being cleaned by intermittently supplying a solvent to the rotating cup 1. As the solvent, it is preferable to use an organic solvent that dissolves the resin component of the paint and has water solubility, such as ethylene glycol monobutyl ether or ethylene glycol monoethyl ether. This is because if the solvent is water-soluble, it will not affect the coating film even if the solvent is mixed into the water-based paint and applied to the object to be coated. Therefore, alcohols can also be used as a solvent if they are water-soluble. The following methods are available for cleaning the rotary cup 1 with this solvent. In the case of FIG. 5a, a nozzle 37 is disposed diagonally rearward on the outside of the rotary cup 1 so that the solvent is sprayed from the nozzle 37 onto the outer periphery of the tip of the rotary cup 1, and the solvent is supplied to the knife edge portion 7. As a result, even if the water-based paint tries to dry at the knife edge part 7, the resin content will be dissolved by the solvent, and even if some drying occurs, the dried resin content will be re-dissolved by the solvent, and the paint will not dry. This prevents the coating from adhering and accumulating on the knife edge portion 7. In the case shown in FIG. 5b, the solvent is sprayed onto the rotary cup 1 with a nozzle 37 from diagonally in front of the rotary cup 1. In this case, the solvent is sprayed onto the inner periphery of the first cylindrical body 3 together with the knife edge portion 7. is also supplied to prevent the dry film from adhering and accumulating on the knife edge portion 7 and the inner surface of the first cylindrical body 3. In the case shown in FIG. 5c, a solvent supply pipe 38 is introduced together with the paint supply pipe 5 into the rear end of the first cylinder 3, and the solvent is supplied from the tip of the solvent supply pipe 38 to the inner circumference of the first cylinder 3. This prevents the dry film from adhering and accumulating on the inner periphery of the first cylindrical body 3. For the products shown in Figure 5 a to c above, it is preferable to supply the solvent for about 5 seconds every 1 minute of painting to prevent paint buildup, but the solvent supply time may be set as necessary. is optional. In addition, in the case of FIG. 5d, a third cylinder 39 is further fitted on the outer periphery of the second cylinder 4,
A solvent is supplied from a solvent supply pipe 41 to an annular hollow chamber 40 formed between the second cylindrical body 4 and the third cylindrical body 39, and the solvent is supplied to the outer peripheral surface of the knife edge portion 7 from a gap 42 between the second cylindrical body 4 and the third cylindrical body 39. However, the dry film 9 is prevented from being deposited on the knife edge portion 7. In this case, the solvent can be fed continuously. In each of the above examples, the amount of solvent supplied is generally about 20 c.c. to 1000 c.c. per minute, so that the amount of water is approximately 10 parts by weight per 100 parts by weight of the paint, and the solvent is supplied intermittently. For example, if the solvent is supplied for 5 seconds every minute, the above amount of solvent will be supplied in these 5 seconds, and if the solvent is continuously supplied, the above amount of solvent will be supplied in 1 minute. amount will be supplied.

In the systems shown in FIGS. 5a to 5d above, each can be used alone, but they can also be used in combination. For example, a combination of Figure 5a and Figure 5b, a combination of Figure 5c and Figure 5d, and a combination of Figure 5a and Figure 5c. , a combination of those in FIGS. 5b and 5d, etc. When used in combination in this manner, the inner and outer surfaces of the rotary cup 1 can be efficiently cleaned at the same time.

6a and 6b show another embodiment of the rotary cup 1 used in the present invention, in which the rotary cup 1 is formed by covering a first cylindrical body 52 with a second cylindrical body 53. A cylindrical shaft 52a integrally protruding from the center of the rear portion of the first cylindrical body 52 is screwed onto the tip of the rotating shaft 54. The first cylindrical body 52 has an inner circumferential surface that is tapered and continuously enlarged in diameter from the center of the innermost part toward the front.
5 is bored, and this paint outlet 55 is connected to the cylinder shaft 5.
It communicates with a paint supply passage 56 which is bored in the axial direction of the rotating shaft 54 through the through hole 2a. Furthermore, a knife edge portion 7 is provided at the tip of the first cylindrical body 52 by making the taper slope even steeper. On the other hand, the second cylindrical body 53 has a rear bottom portion and a first cylindrical body 52.
An annular hollow chamber 6 is formed between the rear bottom part and the cylinder axis 52 of the first cylinder body 52.
It communicates with a plurality of communicating passages 59 formed at equal intervals in a collar body 54a provided around the outer periphery of the tip of the rotating shaft 54 to which the rear part of the rotary shaft 54 is screwed. The rotating shaft 54 is rotatably mounted in the main body 60 by a bearing 64, and is driven to rotate at high speed by a drive shaft 69 via a pulley 71 and a transmission belt 72. Main body 6
An air reservoir chamber 66 is formed in the interior of the communication passage 59.
Air is supplied to this air reservoir 66 from the outside through a compressed air supply pipe 67, and air can be sent to the annular hollow chamber 6 of the rotary cup 1 through the communication passage 59 of the collar body 54a. It's becoming like that. The rear end opening of the paint supply path 56 of the rotating shaft 54 extends into a paint reservoir 75 formed in the main body 60, and the water-based paint supplied via the paint supply pipe 76 passes through the paint reservoir 75 and the paint supply path 50. The paint is then supplied to a paint outlet 55 provided in the rotary cup 1. 77 is a paint reservoir 75 at one end in the direction of the central axis of the paint supply path 56.
The other end is connected to the first cylindrical body 52 from the paint outlet 55.
It is a shaft body that slightly protrudes inward, and a paint diffusion plate 78 like a washer is attached to the other end of this shaft body 77. This paint diffusion plate 78 directs the paint coming out from the paint outlet 55 to the first cylinder. It is designed so that it can be diffused along the inner circumferential surface of 52. In this case, when the paint is supplied into the first cylindrical body 52 from the paint outlet 55, the centrifugal force of the rotary cup 1 acts on the paint, and the paint hits the paint diffusion plate 78, causing the inner cylindrical body 52 to The paint spreads on the inner peripheral surface and at the same time moves toward the tip along the taper of the inner peripheral surface of the inner cylindrical body 52 in the form of a thin film, and the paint supplied to the knife edge portion 7 is electrostatically atomized.

When using such a rotary cup 1, in the case of dripping the solvent into the rotary cup 1 as shown in FIG. Then, pass the solvent from the solvent supply pipe 62 to the solvent supply pipe 61.
The solvent is supplied into the rotating cup 1 from the tip of the cup. In addition, in the solvent supply method as shown in FIG. 5d, the third cylinder 39 is fitted around the outer periphery of the second cylinder 53 as shown in FIG. 6b, as in the case of FIG. 5d. The solvent may be supplied to the annular hollow space 40 between the second cylindrical body 53 and the third cylindrical body 39 from the solvent supply pipe 38. Furthermore, if the solvent is supplied between the second cylindrical body 53 and the third cylindrical body 39 and the solvent is supplied to the knife edge part 7, the centrifugal force caused by the rotation of the rotary cup 1 causes the solvent to be supplied to the knife edge part 7. There is a risk that it will scatter outward before being supplied to the third cylinder 39, but in this case, there is a fourth cylinder on the outer periphery of the third cylinder
The third cylinder 3 is fitted with the cylinder 62 as shown in FIG. 6c.
The tips of a plurality of compressed air supply pipes 63 are inserted between the rear ends of the third cylinder 39 and the fourth cylinder 62 over the entire circumference, and the compressed air supply pipes 63 connect the third cylinder 39 and the third cylinder 62. If compressed air is blown between the ends and a jet air stream is blown out in an annular cylindrical shape from between the tips, the solvent can be reliably supplied to the knife edge portion 7 by controlling the scattering of the solvent with this annular cylindrical jet air flow. In addition, regarding the above-mentioned rotating cup 1, Fig. 5a,
Of course, when the solvent is supplied using the method shown in b, the configurations such as the solvent supply pipe 61, the third cylindrical body 39, and the fourth cylindrical body 62 become unnecessary.

In each of the embodiments described above, the rotary cup 1 is used as the rotating rim for atomizing the paint, but it goes without saying that the rotating disc 1' may also be used as the rotating rim. That is, the rotating disk 1' is driven by the motor 80.
The paint supplied from the paint supply pipe 5 is turned into a thin film by the centrifugal force caused by the rotation of the rotary disk 1', and electrostatically atomized at the edge of the rotary disk 1'. When cleaning this product using the method shown in Figures 5a and 5b, the nozzle 37 is arranged below or above the rotary disk 1' as shown in Figure 7a. To clean the bottom surface and edges of the rotary disk 1', and to supply solvent as shown in FIG. 5c, place the rotary disk 1' in the center of the rotary disk 1' as shown in FIG. 7b. The rotation of the solvent supply pipe 38 causes the solvent to be scattered by centrifugal force through the solvent supply pipe 38 which also rotates, thereby cleaning the lower surface of the rotary disk 1'. Although the rotary disk 1' shown in FIG. 7 is supported from above and moved up and down, it is of course possible to support the rotary disk 1' from below and move it up and down. .

As described above, in electrostatically atomizing a water-based paint from a rotating circular edge for electrostatic painting, the present invention continuously or intermittently supplies the paint while the paint is being continuously supplied.
Since the rotating rim is cleaned by supplying a solvent that dissolves the resin in the water-based paint to the rotating rim,
Even if the water-based paint dries, the dried film is immediately dissolved in the solvent, which prevents the dried water-based paint from adhering to and accumulating on the rotating rim, which is caused by the adhesion and accumulation of the dry film. Electrostatic coating with a rotating circular edge that can prevent water-based paints from reducing the efficiency of electrostatic atomization of paint and disrupting the paint pattern, and is preferred from the standpoint of resource conservation, work environment, and prevention of air pollution. It can be applied to

In the present invention, the solvent for dissolving the resin component may be one that swells the resin component.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the rotary cup, Fig. 2 is an overall view showing an embodiment of the present invention, Fig. 3 is a sectional view of a part of the same, and Fig. 4 is a perspective view showing the painted state of the same. , FIGS. 5 a to d are cross-sectional views showing each method of solvent supply in the same embodiment, and FIGS. 6 a to c to FIGS. 7 a and b are cross-sectional views showing each method of solvent supply in other embodiments of the same. 1 is a rotating cup, and 1' is a rotating disk.

Claims (1)

[Scope of Claims] 1. When electrostatically atomizing water-based paint from the rotating circular edge for electrostatic painting, the water-based paint is continuously or intermittently applied to the rotating circular edge while the paint is continuously supplied. An electrostatic coating method characterized by cleaning the rotating circular edge by supplying a solvent that dissolves the resin. 2. The electrostatic coating method according to claim 1, wherein a water-soluble solvent is used as the solvent.