JP2001162218A - Color change coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color change coating method capable of continuously applying a coating color different at every article to be coated in a coating line. SOLUTION: In a color change coating method wherein marking for indicating coating colors, which are preliminarily applied to various articles to be coated fed by a conveyor, is detected by a sensor or these markings are applied to the articles to be coated to be detected by the sensor and a coating apparatus is operated according to the commands of the indicated coating colors sent from a control panel corresponding to the detection signals and two or more coatings different in color are mixed to apply the indicated coating colors to the articles to be coated, a color mixture coating apparatus having a first coating part having jet orifices for ejecting a base coating and a second coating part having jet orifices for ejecting a color coating of which the color is different from that of the base coating is used as the coating apparatus. In this coating apparatus, the first and second coating parts are arranged so that the ejection directions of both parts cross each other and the ejected base coating and the ejected color coating collide with each other to become a mixed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color changing coating method capable of successively changing the color of a coating object according to an object to be coated in a coating line.

[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 prepare in advance. After coloring, the toned paint is sprayed from a coating gun to perform the coating. For example, in ship hold, when performing anticorrosion coating of shipbuilding steel (painting of shop primer), the base paint was gray and the color paint was red or green, and the colors were painted according to the type of steel material. .

However, the above method requires a device for automatically measuring and uniformly mixing the base paint and the color paint, so that not only the equipment cost is increased, but also a large mixing tank is required, and a wide installation space is secured. In addition, when changing the color of the coating, there is a problem that it is necessary to discard a large amount of the remaining paint in the mixing tank and wash the inside of the tank with a large amount of an organic solvent.

[0004] Especially in a ship hold, the paint mixing tank is large in view of the size of the steel material, the man-hours of paint disposal and tank cleaning are enormous, and further, various steel materials to be conveyed are washed and drained. Since color-coding is performed for each lot, it is necessary to sort various steel materials by type, and there is also a problem that a crane device and a large space (yard) for sorting work and a large number of man-hours are required.

It is an object of the present invention to provide a color changing coating method which can instantaneously change to a different coating color in a coating line, and which can continuously apply different coating colors depending on an object to be coated while sequentially switching. is there.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a marking for designating a coating color is provided in advance on or applied to various objects to be conveyed by a conveyor, and the marking is detected by a sensor. A color change coating method in which a coating device operates according to a command of each designated paint color sent from the control panel in response to the detection signal, and paints each designated paint color by mixing two or more paints having different colors. The coating device is
A first coating portion having an injection hole for injecting a base paint, and a second coating portion having an injection hole for injecting a color paint having a different color from the base coating, wherein the first coating portion and the second coating portion are provided. The color changing coating method is characterized in that the parts are arranged so that the jetting directions intersect and the mixed color coating device is configured so that the jetted base paint and color paint collide and become mixed. To provide.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, first, if various kinds of objects to be conveyed by a conveyor are not previously marked to designate a coating color, the markings are respectively performed. The marking portion is detected by a sensor such as a CCD camera. The detection signal is sent to the control panel, and the type of the marking is recognized. As a result, a command to paint the designated paint color is sent from the control panel to the painting device. Along with the command, in the coating line, the shape and size of the object to be coated are detected by, for example, a shape sensor or the like, and a command to turn on / off the discharge of the paint is sent to the coating apparatus by the control panel.
The coating device is operated according to the command, and the coating of each designated coating color is performed.

[0008] The coating apparatus used in the present invention is an apparatus for mixing and coating two or more paints having different colors.
A first coating portion having an injection hole for injecting a base paint, and a second coating portion having an injection hole for injecting a color paint having a different color from the base coating, wherein the first coating portion and the second coating portion are provided. The unit is a color mixing coating device that is arranged so that the jetting directions intersect, and is configured so that the jetted base paint and color paint collide and become mixed.

Hereinafter, an example of the coating apparatus will be described with reference to FIGS.
It will be described based on FIG. FIG. 1 is a perspective view showing an example of the coating apparatus, and FIG. 2 is a plan view thereof.

The coating apparatus 1 includes a first coating section 10 for spraying a base paint and two second coating sections 20 for spraying a color paint different in color from the base paint. Various materials can be used for the base paint and the color paint. The viscosity of the base paint and the color paint is 10 to 5000 mPa · s, preferably 100 to 1
The range of 000 mPa · s is appropriate. 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 often red rust or green, 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 front end of the 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. Nozzle 1
A nozzle tip 16 having an injection groove 18 is attached to the tip of the nozzle 4. As shown in the cross-sectional view of FIG. 3, the spray groove 18 is formed so that the paint spray hole 17 is opened at the bottom 18 a and is orthogonal to the axial direction of the spray hole 17. It has a planar shape. Injection hole 17
Is discharged from the side surface 18b of the injection groove 18.
It is sprayed while spreading along.

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 provided inside the nozzle. After being mixed in the same manner as in the first coating section 10, the injection holes (not shown) formed in the nozzle tips 26 are formed.
Is configured to be injected from the injection groove 28 through the nozzle. On / off of the color paint injection 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 unit 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-like bracket 40, and one end of the bracket 40 is provided with a screw 4
2, it is swingably attached to the first coating unit 10. 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. The first coating unit 10 and the first coating unit 10 are designed so that the collision area between the base coating and the color coating is increased.
(2) It is preferable that the axis of each injection hole in the coating portion 20 is made to coincide with the same plane, and the directions of the injection grooves 18 and 28 (the directions perpendicular to the axes of the corresponding injection holes) are made substantially parallel. Is preferred.

In the coating apparatus having such a configuration, the injection direction of the second coating section 20 is first inclined with respect to the injection direction of the first coating section 10 so that the base paint and the color paint are sprayed on the object to be coated. The two collide. Since the injection amount of the base paint is generally much larger than the injection amount of the color paint, the particles of the color paint that collided with the particles of the base paint arrive at the substrate by mixing with the base paint and riding the flow of the base paint. 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 paint 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. Note that the collision position of the color paint on the base paint does not necessarily have to be the same between the two second coating portions 20, but 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 mixed in advance in the tank or the like, but when not so high toning accuracy is required, It can be said that the color mixing state is sufficient.
For example, in the case of painting with a shop primer, the present coating method 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. Color does not affect the appearance of the finished product.

Although the coating apparatus used in the method of the present invention has been described in detail above, the first coating section 10 may use a known air spray gun which sprays a coating material 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 above description, the second coating portion 20 is fixedly attached to the bracket 40. However, as shown in FIG. 4, a long hole 44 is formed in the bracket 40, and the second painting portion 20 is movable along the long hole 44. The second coating unit 20 may be attached so as to be as follows. As a result, not only the adjustment of the inclination angle θ of the second coating unit 20 but also the position adjustment can be performed, so that the collision position between the base paint and the color paint can be adjusted more easily and accurately.

It is not always necessary to provide two second coating portions 20 as described above, and it is possible to provide only one of them or two or more. Thus the second
By providing a plurality of coating portions 20, 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.

In the method of the present invention, in particular, paints of different colors are sprayed from the second paint section 20, and one or more paints to be actually sprayed are appropriately selected, thereby changing the color of the paint. It is possible to respond easily and quickly, and the combination of a plurality of colors makes it possible to greatly increase the variety of coating colors. When three or more second coating portions 20 are provided, for example, the nozzles 14 in the first coating portion 10 may be swingably attached to the left, right, upper and lower sides of the nozzle 14 via brackets, or the brackets shown in FIG. Two or more slots 44 may be provided.

The above-mentioned coating apparatus is usually installed and supported by a coating arm or the like in an exhaust duct serving as a coating space, and is subjected to reciprocating motion.

As described above, in the method of the present invention, the discharge amount of each paint from the first and second painting parts is controlled by the above-mentioned painting apparatus so that the paint color specified by the object to be painted is obtained. Thus, it is possible to continuously paint while sequentially changing the paint color. The above-described coating apparatus does not exclude the case where the discharge amount of the second coating section is set to 0 and only the base paint is applied.

The object painted by the above-mentioned painting apparatus can be constantly monitored by a sensor for confirming the painting color provided in the painting line to check whether the object is painted in an appropriate color. If the paint color is not correct, it is detected by the sensor and the control panel stops the conveyor,
It is possible to take measures according to the cause and restart the coating line.

[0024]

EXAMPLE 1 FIG. 5 is a schematic illustration of a shop primer coating line based on an example of the method of the present invention.

In FIG. 5, a steel material 50 directly mounted on a conveyor 52 from a ship (not shown) firstly undergoes a washing / draining process (area 53), and then a marking 51 for designating a coating color according to its type is made. (Area 54). For example, one line in gray, two lines in red rust, and three lines in green are marked on the steel plate 50 by magic. The marking 51 is detected by a sensor 55 (CCD camera), and the detection signal is sent to a control panel 56 to recognize the type of the marking. Thus, a command to paint the designated paint color is sent from the control panel 56 to the painting apparatus 1. On the other hand, the steel material 50 is subjected to a shot blast process (area 57) before painting.

Next, the shape and size of the steel material 50 are detected by the shape sensor 58 and the control panel 56 is detected.
As a result, a paint discharge ON / OFF command is sent to the coating apparatus 1. The coating apparatus 1 operates according to the command, and the coating of each designated coating color is performed.

The coating apparatus 1 is installed and supported by a coating arm (not shown) in an exhaust duct 59 serving as a coating space, and is subjected to reciprocating motion. The coating device 1
1 includes a first coating unit 10 for spraying a base paint B, and a second coating unit 20 for spraying color paints C1 and C2 having different colors from the base paint B. Device. The first coating unit 10 uses an airless gun, and the second coating unit 20 uses a two-fluid nozzle. Also the first
The base paint B is sent from the tank 60 to the painting section 10 by a paint pipe equipped with an airless pump 61,
In the coating section 20, color paints C1 and C2 are respectively switched by color change valves 66 from paint tanks 62 and 63 through paint pipes having diaphragm pumps 64 and 65, and together with air A from an air supply device (not shown). Sent. At the time of color switching, a cleaning thinner 67 is sent to the color change valve 66 and the second coating unit 20. The steel plate coated by the coating apparatus 1 is constantly monitored by a sensor 68 for confirming the coating color to check whether it is coated in an appropriate color.

Here, an airless automatic gun “AG Gun” manufactured by Asahi Sunac Co., Ltd. was used for the first coating unit 10.
For the nozzle tip 16 of No. 0, "Airless Tip 821" manufactured by Nippon Gray Co., Ltd. was used, and for the second coating portion 20, "Mini Mist", which is a two-fluid nozzle manufactured by Everloy, was used.
The distance between the two nozzle tips 26 is 3 cm,
The inclination angle θ of 0 was adjusted to 30 degrees. Base paint B
Is a gray paint manufactured by Kansai Paint Co., Ltd.
Zinc 1000HA (S) gray "and a red rust paint" S "manufactured by Kansai Paint Co., Ltd.
D zinc 1000HA (S) red rust paste "
As the color paint C2, "SD Zinc 1000HA (S) Green Paste" which is a green paint manufactured by Kansai Paint Co., Ltd. was used. In addition, KEY is used as a sensor for checking paint colors.
"Color discriminating sensor PI-C" manufactured by ENCE was used.

The fluid pressure of the first coating unit 10 is 6 to 8 MPa, the injection rate of the base coating material is 1400 to 1700 g / min, and the atomizing air pressure of the second coating unit 20 is 0.3 to 0.4M.
The injection amount of the color paint is 40 per minute per nozzle as Pa.
Ｇ60 g, and the distance to the steel plate was 20-40 cm.

When the coating line was operated as described above, the color was changed instantaneously for each of the conveyed steel sheets, and the color mixing of each coating color was good.

[0031]

According to the method of the present invention, it is possible to instantaneously change to a different coating color in a coating line without previously preparing a coating in a mixing tank or the like. A color change painting that can be switched continuously even in colors and can be painted continuously. In particular, in the case of a ship hold or the like, sorting for each paint color is not required, and a large reduction in equipment and man-hours can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a coating apparatus used in the present invention.

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

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

FIG. 4 is an assembled perspective view showing a part of another coating apparatus used in the present invention.

FIG. 5 is a schematic explanatory view of a coating line based on an embodiment of the method of the present invention. (Top view)

[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 50 Steel plate 51 Marking 52 Conveyor 53 Drain area 54 Marking area 55 Sensor 56 Control panel 57 Shot blast area 58 Shape sensor 59 Exhaust duct 60 Base paint tank 61 Airless pump 62 (Red rust) Color paint tank 63 (Green) Color paint tank 64, 65 Diaphragm pump 66 Color change valve 67 Thinner for cleaning 68 Sensor for checking paint color

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norihisa Toda 33-1, Kanzakicho, Amagasaki-shi, Hyogo Kansai Paint Co., Ltd. F-term (reference) 4D075 AA01 AA39 AA55 AA74 AA81 AE21 CA47 DA06 DB02 DC08 4F035 AA03 BA05 BA11

Claims (3)

[Claims] 1. A marking for designating a coating color is preliminarily provided on or applied to various objects to be conveyed by a conveyor, and the marking is detected by a sensor, and the control panel is controlled in accordance with the detection signal. A coating apparatus is operated according to a command of each designated coating color sent from the above, and is a color change coating method in which two or more paints having different colors are mixed to apply each specified coating color, wherein the coating apparatus converts a base paint. A first coating part having an injection hole for spraying, and a second coating part having an injection hole for spraying a color paint different in color from the base paint, wherein the first coating part and the second coating part are sprayed. A color-changing coating method, wherein the color-changing coating apparatus is arranged so that the directions intersect with each other, and is configured so that the jetted base paint and color paint collide and become mixed. 2. The color changing coating method according to claim 1, wherein the coating device includes a plurality of second coating units. 3. The color changing coating method according to claim 1, wherein a coating color confirmation sensor is provided after the coating.