JP3326493B2 - Mixed color coating method and mixed color coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mixing two or more paints of different colors.

[0002]

2. Description of the Related Art Conventionally, in the case of coating with a colored paint, a base paint and a color paint are weighed at a fixed ratio so as to have a desired color, and these are sufficiently mixed in a mixing tank to be adjusted in advance. Later, the toned paint is sprayed from a coating gun to perform the coating. For example, in ship hold, when performing rust-preventive coating (painting of shop primer) on shipbuilding steel, the base paint is gray and the color paint is red or green. ing.

[0003]

However, the conventional coating method requires a device for automatically measuring and uniformly mixing the base paint and the color paint, which not only increases the equipment cost but also increases the size of the mixing tank. Needed. Therefore, not only is a large installation space required, but also a large amount of paint in the mixing tank must be discarded when changing the color of the coating, and furthermore, a large amount of organic solvent is required for cleaning work in the mixing tank. there were.

Therefore, instead of providing a mixing tank for mixing the paint, a method has been proposed in which a static mixer for mixing the base paint and the color paint is provided in the middle of the paint pipe, and both are mixed in a process of supplying the paint gun. ing.

However, when a static mixer is used, there is a problem that the cost is increased due to its complicated shape. Further, when the flow rate of the color paint is considerably smaller than the flow rate of the base paint (for example, about 1/20 of the flow rate of the base paint), it is difficult to uniformly disperse the color paint in the base paint, so There is a problem that the color mixing state is not good.

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and it is possible to easily and inexpensively form a desired color-mixed coating film by mixing two or more paints having different colors. It is an object of the present invention to provide a mixed-color coating method and a mixed-color coating apparatus that can be used.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of spraying a base paint from a first paint section for spraying the base paint by hydraulic pressure and a second paint comprising a two-fluid nozzle.
Air supplied to the air inlet of the charging unit and supplied to the liquid inlet
After mixed the color paint inside the nozzle, the base paint and color different said color coating, as the injection amount of the base coating is greater than the injection amount of the color paint, injection of the base paint This is achieved by a mixed-color coating method, which comprises spraying the base paint and the color paint into a mixed state by spraying the paint toward a flow, and then spraying the paint on an object to be coated. It is preferable that a plurality of the second coating units are provided.

Further, the object of the present invention is to provide a first coating section having an injection hole for injecting a base paint, wherein the first coating section is configured to inject the base paint by hydraulic pressure, an air inlet, and a first coating section.
A two-fluid nozzle having a liquid inlet;
The air supplied to the inlet and the gas supplied to the liquid inlet
After mixing the color coating material inside the nozzle, and a second coating portion having an injection hole for injecting the base paint and color different said color coating, said first coating portion and a second coating unit injection This is achieved by a mixed-color coating apparatus which is arranged so that the directions cross each other, and is configured so that the jetted base paint and color paint collide with each other to form a mixed state. It is preferable that a plurality of the second coating units are provided.

Further, the second coating section adjusts the inclination angle of the injection direction of the second coating section with respect to the injection direction of the first coating section so that the base coating and the color coating can be mixed well. It is preferable that the first coating unit is supported by the first coating unit so that the position can be adjusted with respect to the first coating unit. preferable.

[0010] The first coating section and the second coating section may include:
The injection hole has an injection groove opened at the bottom, the injection groove is formed so as to be orthogonal to the axial direction of the injection hole, and the direction of each injection groove is substantially parallel. preferable.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Specific embodiments of the color mixing coating method and the color mixing coating apparatus according to the present invention will be described. FIG. 1 is a perspective view showing a color mixing coating apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

As shown in FIGS. 1 and 2, the coating apparatus 1 includes a first coating section 10 for spraying a base paint and two second coating sections 10 for spraying a color paint different in color from the base paint.
A painting unit 20 is provided. Various materials can be used as the base paint and the color paint, and examples thereof include zinc rich primer, epoxy resin paint, urethane resin paint, polyester resin paint, amino alkyd paint, and acrylic resin paint. The viscosity of base paint and color paint is 10-5000 mPa.
s, preferably 100 to 1000 mPa · s
Is more preferable. Further, the colors of the base paint and the color paint can be arbitrarily selected in consideration of harmony between them. For example, in the rust prevention coating of a steel plate in a ship hold, the base paint is often white or gray and the color paint is red rust or green in many cases, but is not limited thereto.

The first coating unit 10 is a known airless gun in which a nozzle 14 is provided at the center of the tip of a main body 12,
A needle valve (not shown) is provided inside the nozzle 14. And this needle valve is the air electromagnetic valve 3
When opened by the operation of 2, the supplied base paint B is configured to be jetted by the hydraulic pressure. A nozzle tip 16 having an injection groove 18 is provided at the tip of the nozzle 14.
Is attached. As shown in the cross-sectional view of FIG. 3, the spray groove 18 has a paint spray hole 17 opened at the bottom 18a,
It is formed so as to be orthogonal to the axial direction of the injection hole 17 and has a substantially V-shaped vertical cross-sectional shape. Injection hole 1
7, the base paint discharged from the side surface 18 of the spray groove 18
It is injected while spreading along b.

The second coating unit 20 may be a known two-fluid nozzle, in which the air A supplied to the air inlet 22 and the color paint C supplied to the liquid inlet 24 are formed inside the nozzle. After being mixed, similarly to the first coating unit 10, an injection hole (not shown) formed in the nozzle tip 26
Is configured to be injected from the injection groove 28 through the nozzle. On / off of the injection of the color paint is performed by operating or stopping a valve 34 provided in the air pipe and a pump 36 provided in the paint pipe. It is controlled by a controller (not shown) for adjusting the discharge amount of the pump 36. The spray angle of the second coating section 20 is preferably 20 to 40 degrees.

The second coating portion 20 is provided on both sides of the nozzle 14 of the first coating portion 10 via a plate-shaped bracket 40, and one end of the bracket 40 is connected to the first coating portion by a screw 42. 10 is swingably attached. Thereby, the inclination angle θ of the injection direction of the second coating unit 20 with respect to the injection direction of the first coating unit 10 can be adjusted to an arbitrary angle, and the color paint can collide with the injected base paint. It is preferable that the axes of the respective injection holes in the first coating unit 10 and the second coating unit 20 be located on the same plane so that the collision area between the base coating material and the color coating material is increased. 2
8 directions (directions perpendicular to the axis of the corresponding injection holes)
Are preferably substantially parallel to each other.

Next, the operation of the coating apparatus having such a configuration will be described. First, the injection direction of the second coating unit 20 with respect to the injection direction of the first coating unit 10 is inclined, and the base paint and the color paint collide with each other before being sprayed on the work. The amount of base paint sprayed is generally much greater than the amount of color paint sprayed, so particles of color paint that collide with particles of base paint ride on the flow of base paint while mixing with the base paint to reach the workpiece. I do. Thus, the base paint and the color paint are mixed to form a coating film having a desired color.

When the shape of the injection grooves 18 and 28 is changed by replacing the nozzle tips 16 and 26, or when the viscosity of the base paint or the color paint changes, the second coating unit 2
By appropriately adjusting the inclination angle θ of 0, the base paint and the color paint can collide at a desired position. This collision position is preferably set at a distance of 10 to 50 cm from the surface to be coated. In addition, the collision position of the color paint with the base paint does not necessarily have to be the same between the two second coating portions 20, and may be different from each other.

The coating film thus formed is slightly inferior to the coating film in the case where the coating film is sufficiently uniformly mixed in advance in the tank or the like, but the coating film does not require very high toning accuracy. It can be said that the mixed color state is sufficient. For example, in the case of the above-described shop primer coating, the present coating apparatus can be used to identify the type of steel plate by the color of the shop primer, while a plurality of coating films are further formed on the surface of the shop primer. Therefore, the color of the shop primer does not affect the appearance of the finished product.

Although the specific embodiment of the present invention has been described in detail, the first coating unit 10 may use a known air spray gun that sprays paint by a compressed air flow instead of using an airless gun. It is possible. Generally, an air spray gun is used at an injection amount of 50 to 500 cc per minute, and an airless gun is used at an injection amount of 1000 to 2500 cc per minute. For the second coating unit 20, an airless gun can be used instead of the two-fluid nozzle.

In the present embodiment, the second coating unit 2
0 is fixedly attached to the bracket 40, but FIG.
As shown in FIG. 7, a long hole 44 is formed in the bracket 40, and the second coating portion 2 is formed so as to be movable along the long hole 44.
0 may be attached. Thereby, not only the adjustment of the inclination angle θ of the second coating portion 20 but also the position adjustment are possible, so that the collision position between the base paint and the color paint can be adjusted more easily and accurately.

Further, the number of the second coating portions 20 does not necessarily have to be two as in this embodiment, and it is possible to use only one of them. It is preferable to make the above. By providing a plurality of the second coating units 20 in this manner, the collision positions of the jet flow of the base paint and the jet flow of the color paint can be dispersed, and more favorable color mixing can be obtained. Furthermore, by changing the colors of the paints to be sprayed from the second coating unit 20 and appropriately selecting one or a plurality of paints to be actually sprayed, the color change of the paint can be performed easily and quickly. Instead, the combination of a plurality of colors makes it possible to greatly increase the variety of paint colors.
When three or more second coating units 20 are provided, for example, the nozzles 14 in the first coating unit 10 may be swingably attached to the left and right and upper and lower sides of the nozzle 14 via brackets, or as shown in FIG. 2 in slot 44 of bracket 40
More than one may be provided.

[0022]

Embodiment 1 An airless automatic gun “AG” manufactured by Asahi Sunac Co., Ltd. was applied to the first coating section 10 shown in FIGS.
A gun was used, and “Airless Tip 821” manufactured by Nippon Gray Co., Ltd. was used for the nozzle tip 16 of the first coating unit 10. For the second coating unit 20, a "mini mist" which is a two-fluid nozzle made by Everloy was used. Nozzle tip 1
The distance between 6 and 26 was 3 cm, and the inclination angle θ of the second coating unit 20 was adjusted to 30 degrees.

As a base paint, "SD Zinc 1000HA" which is a gray paint manufactured by Kansai Paint Co., Ltd.
(S) Gray ”, and as a color paint,“ SD Zinc 1000 ”which is a red rust paint made by Kansai Paint Co., Ltd.
HA (S) red rust paste "was used.

When the fluid pressure of the first coating unit 10 is 8 MPa, the injection amount of the base coating material is 1700 g / min, and the second coating unit 2
The atomizing air pressure of 0 was set to 0.3 to 0.4 MPa, the injection amount of the color coating was set to 60 g per minute per nozzle, and the coating was performed while maintaining the distance to the object to be coated at 20 to 40 cm.
After the coating, the color mixing property of the coating film was visually confirmed to be good.

Example 2 An "AG gun", an automatic airless gun manufactured by Asahi Sunac Co., Ltd., was used for the first coating section 10 and the second coating section 20 shown in FIGS. For the nozzle tip 16 of the first coating unit 10, “Airless Tips 423 to 429” manufactured by Nippon Gray Co., Ltd. are used, and for the nozzle tip 26 of the second coating unit 20, “Airless Tip 315” manufactured by Nippon Gray Co., Ltd. It was used. Nozzle tip 16,
26 was 5 cm, and the inclination angle θ of the second coating unit 20 was adjusted to 32 degrees.

A white paint "New Forte White" manufactured by Kansai Paint Co., Ltd. was used as a base paint, and Kansai Paint Co., Ltd. was used as a color paint.
"New Forte Green" which is a green paint manufactured by Nissan was used. The viscosity of the base paint and the color paint was adjusted to 3000 mPa · s using a special thinner.

With the liquid pressure of the first coating unit 10 and the second coating unit 20 set to 10 to 12 MPa, the injection amount of the base paint is set to 2000 to 3000 g / min, and the injection amount of the color paint is set to 80 / min.
The coating was performed while maintaining the distance to the object to be coated at 30 to 50 cm. After the coating, the color mixing property of the coating film was visually confirmed to be good.

[Embodiment 3] In the first coating section 10 shown in FIGS. 1 and 2, "T-AGB (air cap number 265)" which is an automatic air spray gun made by Devilbiss was used.
For the second coating unit 20, "Mini Mist" which is a two-fluid nozzle made by Everloy was used. As shown in FIG. 4, the second coating portion 20 was attached so that the position could be adjusted, the distance between the nozzle tips 16 and 26 was 3 cm, and the inclination angle θ of the second coating portion 20 was adjusted to 30 degrees. .

As a base paint, "Neo-Amilac 6000 *" is a white paint manufactured by Kansai Paint Co., Ltd.
Using "White" as the color paint, "Neo-Amilac 6000 ・" is a red paint made by Kansai Paint Co., Ltd.
Red "was used. The viscosities of the base paint and the color paint were adjusted to 100 mPa · s with a special thinner.

The air pressure of the first coating unit 10 is set to 0.35MP.
As a, the injection amount of the base paint is 200 to 300 g per minute, the atomizing air pressure of the second coating section 20 is 0.3 MPa, the injection amount of the color paint is 50 g per minute, and the distance to the object to be coated is 20 to 300 g. The coating was performed while maintaining the height at 40 cm. After the coating, the color mixing property of the coating film was visually confirmed to be good.

[0031]

As is clear from the above description, according to the color mixing method and the color mixing apparatus according to the present invention, two or more paints having different colors are jetted from the first coating part and the second coating part, respectively. Later, both are mixed and sprayed onto the surface to be coated, so that it is not necessary to mix the paint in a mixing tank or the like in advance as in the conventional case. Therefore, the size of the equipment can be reduced, and a coating film with desired color mixture can be easily and inexpensively formed.

When two or more second coating portions are provided, when the same color paint is sprayed from each second coating portion, the color mixture state of the coating film can be improved, and each second coating portion can be improved. When color paints of different colors are jetted from the two painting parts, color change can be performed easily and quickly, and the color variation becomes rich.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a color mixing coating apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the color mixing coating apparatus shown in FIG.

FIG. 3 is a sectional view of a main part of the color mixing coating apparatus shown in FIG.

FIG. 4 is an assembled perspective view showing a part of a color mixing apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coating apparatus 10 1st coating part 16 Nozzle chip 17 Injection hole 18 Injection groove 20 Second coating part 22 Air inlet 24 Fluid inlet 26 Nozzle tip 28 Injection groove 40 Bracket 42 Screw 44 Slot hole θ Angle of inclination A Air B base Paint C Color paint

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuya Iwamura 4-17-1, Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture Inside Kansai Paint Co., Ltd. (72) Inventor Shoji Hama 33-1, Kanzakicho, Amagasaki-shi, Hyogo Kansai Paint (72) Inventor Norihisa Toda 33-1, Kanzakicho, Amagasaki-shi, Hyogo Kansai-Paint Co., Ltd. (56) References JP-A-5-155200 (JP, A) JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B05B 7/08 B05D 1/02

Claims (7)

(57) [Claims] 1. A coating method in which two or more paints of different colors are mixed and painted, wherein said base paint is sprayed from a first paint section which sprays a base paint by hydraulic pressure. The second comprising a two-fluid nozzle
Air supplied to the air inlet of the coating section and supplied to the liquid inlet
After the sheet has been color paint was mixed at the nozzle, the base paint and color different said color coating, as the injection amount of the base coating is greater than the injection amount of the color paint, the base paint Injecting toward the injection flow,
A mixed-color coating method, wherein the base paint and the color paint are caused to collide with each other to form a mixed state, and then sprayed onto the object to be coated. 2. The method according to claim 1, wherein a plurality of the second coating units are provided. 3. A coating apparatus for coating a mixture of two or more paints of different colors, having jet holes which jet a base paint, the said base coating configured to inject hydraulically (1) A coating section and a two-fluid nozzle having an air inlet and a liquid inlet.
The air supplied to the air inlet and the liquid inlet
After mixing with the color paint supplied to the inside of the nozzle,
The base coating color different said and a second coating portion having jet holes which jet a color paint, the first coating section and the second coating unit is arranged such that the jetting direction intersecting the injection Wherein the base paint and the color paint are colliding with each other to form a mixed state. 4. The mixed-color coating apparatus according to claim 3, wherein a plurality of the second coating units are provided. 5. The apparatus according to claim 1, wherein the second coating unit is supported by the first coating unit so that an inclination angle of the injection direction of the second coating unit with respect to the injection direction of the first coating unit can be adjusted. The color mixing coating device according to claim 3 or 4, wherein 6. The apparatus according to claim 3, wherein the second coating section is supported by the first coating section so that a position with respect to the first coating section can be adjusted. Color mixing equipment. 7. The first coating portion and the second coating portion each have an injection groove having the injection hole opened at the bottom, and the injection groove is orthogonal to an axial direction of the injection hole. The color mixing coating apparatus according to any one of claims 3 to 6, wherein the direction of each of the injection grooves is substantially parallel.