JPH03207465A - Device and method for coating utilized for instantaneous toning - Google Patents

Abstract

PURPOSE:To enable toning without performing mixing operation of coating by spraying the respective primary colors toward the material to be coated in a dotty state and making an article coated with primary colors and measuring these colors to compare them with a color sample and inputting differences thereof into a computer and spraying the necessary additional amount of the respective primary colors. CONSTITUTION:Base color is previously programmed by a computer 20 for a color sample 11 drawn all in a patternless state. Both this base color and the sprayed amount of the singular number of or a plurality of primary colors are calculated and transferred to a coating spray type coater 30. Further the material 12 to be coated wherein the base color is uniformed is prepared. Then the coating spray guns 51 distributed with the respective primary colors are utilized and the primary colors are sprayed toward the material 12 to be coated in a dotty state. Thereby an article 13 coated with the primary colors is made. The color of the article 13 coated with the primary colors is measured by utilizing a colorimeter 14. This measured color is compared with the color of the color sample 11 and the difference thereof is inputted into the computer 20. The necessary additional amount of the respective primary colors is sprayed toward the article 13 to be coated in the dotty state. The color of the color sample is realized. As a result, coating of the primary colors is directly stuck on the surface of the material to be coated and thereby toning is enabled.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is for directly painting various coated objects with the same color based on a color sample drawn in one color without any pattern. Concerning apparatus and methods. The coating method according to the invention is particularly suitable for directly applying color to objects to be coated, such as galvanized steel sheets, plastic films, glass, stainless steel sheets, aluminum sheets, paper, cloth, or pre-coated sheets thereof. (Prior Art) Color samples are generally drawn in one color without any pattern, and those who wish to paint must select one from a large number of color samples and request a painting company. A painting company orders a color sample number, and the paint company mixes multiple primary color liquids such as red, blue, and yellow to mix paint to obtain the same paint color as the specified color sample. The process of mixing paints to match a color sample is called color matching, but in order to create a color match, you must first decide on the type and amount of primary colors you need. However, this largely depends on the long experience and intuition of the color matching engineer.
There were certain limits to productivity improvement. Color toning methods performed by visual inspection by color toning engineers inevitably involve repeated trials and errors many times, and with the addition of the phenomenon of optical metamerism, it is not easy to obtain a desired toned color product. Therefore, the CCM (Computer Color Manning) system was devised, and JP-A-61-19675 ``Computer Color Mixing Method'' discloses a number of conventional techniques and color mixing methods that are improved upon. There is. However, in all of these conventional techniques, color toning operations are performed by mixing primary color paints, so a series of steps such as pouring, measuring, mixing, stirring, and comparative measurements of primary color paints takes a long time. Since these steps had to be repeated, there was a significant disadvantage in that speed amplifiers could not be achieved. (Problems to be Solved by the Invention) The purpose of the present invention is to apply the primary color paint directly to the surface of the object to adjust the color without requiring the operation of mixing the primary color paint in a container. Automatic V! The objective is to provide a mounting method and device. (Means for Solving the Problems and Their Effects) The present invention, in its first eleventh aspect, includes a color sample (A) drawn in one color with no pattern, and a coated object (A) coated with a predetermined base color. B), a detection means for optically detecting the painted object (C) on which a primary color for toning is applied and reading it as a color signal, and a color sample (A) obtained by the detection means. , the object to be painted (B) and the painted object (
A computer inputs data for color sample (A), and compares the data input manually inside this computer with the data previously input into the computer to determine the color sample (A).
) A production circuit that calculates the injection amount of a single or multiple primary colors necessary to reproduce the color of An injection control means for injecting the paint, a moving means for holding each paint injection gun and moving each paint injection gun relative to the object to be coated (B) or the painted article (C), and cooperating with the injection control means. and drive control means for controlling the moving direction and moving distance of each paint spray gun, and the sprayed primary color particles for toning are painted in dots on the object to be coated (B) or the coated article <C>. To provide an instant color toning type coating device which reproduces the color of a color sample (A) by combining the color before spraying and the sprayed primary color dots. In addition, as a second aspect of the present invention, galvanized steel sheets, plastic films,
A base color is applied uniformly onto a substrate made of glass, stainless steel plate, aluminum plate, paper, cloth, or a pre-coated plate of these, and then a single or multiple toning primary colors are applied in dots on top of the base color. This is an instant color toning type painting method that reproduces the color of the color sample by combining dots of the base color and the primary color for toning on the object to be coated. On the other hand, the base color and the spray amount of one or more primary colors, which are programmed in advance on a computer, are transmitted to a paint injection type coating machine to prepare a workpiece that is evenly coated with the base color. Next, a paint spray gun equipped with each primary color is used to spray each primary color in dots onto the object to be coated to create a primary color painted item, and a colorimeter is used to measure the color of the primary colored painted item and a color sample is created. This is an instant color toning type painting method that reproduces the color of the color sample by manually inputting the difference between the two colors and ejecting the required additional amount of each primary color onto the object to be painted in a dot pattern. provide. According to the instant color toning type coating device and coating method according to the present invention, for example, a color sample consisting of a patternless pink color drawn on a thin plate can be detected by a color discrimination device such as a color sensor, a color tester, a color analyzer, or a color image scanner. Read the signal with a video camera etc. and send the signal to the computer.
A base color that is applied uniformly onto the object to be coated by referring to a similar color sample that has been input into the computer in advance;
Select the primary colors to be mixed, for example white as the base color and red as the primary color for toning, and calculate the amount of injection. Based on the calculation results, the base color, white, is first applied uniformly onto the object to be coated. This applies to various painting equipment such as spray painting, roller painting, dipping t1! This can be done using a coating, etc., and any method of painting may be used. Next, the injection control device is used to spray the calculated amount of red, selected as the primary color for toning, from the injection nozzle of the paint injection gun onto the workpiece coated with the white base color. Spray primary color paint in dots at the target. In order to coat a predetermined area of the object, the paint spray gun is moved relative to the object. The primary color sprayed in dots adheres to the white base color as fine red dots, resulting in a primary-colored painted product that appears pink, which approximates the color of the color sample. It becomes like this. Here, we use a colorimeter to measure the color of the primary color painted product and detect the difference between the color sample and the pink color. If the difference is within the tolerance, the color matching is complete, but if the difference exceeds the tolerance, the amount of primary color spray to be added is calculated and the red primary color is painted again using the paint spray gun. ．． By repeating this process, a desired toned product can be obtained. If the pink color of the primary color painted item is lighter than the color sample, you can add and spray red primary color, but if it is darker than the color sample, you can set the initial primary color spray amount to be smaller. When painting two primary colors on a base color, they may be sprayed at the same time, or one may be mixed by spraying the other before it dries. V in a big way! The method of controlling the injection amount for printing is to change the dot size (diameter dimension) and dot ratio (density).
It is sufficient to change the diameter of the injection nozzle and the injection time, but it is also possible to control only one of them. The method of the present invention eliminates the need for a series of steps of mixing multiple primary colors in a container, thereby significantly simplifying the color mixing operation and achieving speed amplifiers. All colors are processed internally by the computer, so there is no need for a skilled color mixing technician, and you can always get consistent quality paint. Here, the term "paint spray gun" in the present invention refers to an electrostatic painting gun or other spray gun that atomizes or pulverizes paint, ink, etc. by creating a positive or negative electric field between the object to be coated and the gun. It includes a wide range of equipment, including paint spray guns of electrostatic sprayers normally used in the paint industry, as well as spray guns that spray ink in a jet shape and electrically control the direction of the mist flow. ．． P1 of the present invention! The following paints are suitable for use in the coating method: A) In the case of ink jetting, water-soluble or oil-based inks colored with dyes, or oil-based inks colored with pigments. As an example of water-soluble ink, C.I. I. acidlend 51
,C. ! ．． Acid Yellow 1.3, C. ■． Acid Orange 10, C. I. Direct blank 59,97
, 118, 134, 137, etc. dissolved in water or diethylene glycol solution. An example of oil-based ink is one in which an organic solvent-soluble dye such as oil black or oil blue is dissolved in an organic solvent such as diethylene glycol dimethyl ether, and if necessary, a phenolic antioxidant is added. B) In the case of spray injection, use a quick-drying type of ink that penetrates deeply and does not repel. Examples include stimulants such as TiOx, Rikiichi Bomb Black, and Mapico Yellow dissolved in organic solvents. C) Clearer for protecting the colored film. One type of paint is an acrylic type paint that contains antioxidants and ultraviolet absorbers. This clear paint layer may be applied by the method of the present invention or by air spray. Examples of antioxidants include phenolic compounds and Sanol L.
S292 (product name) can be used. Examples of UV absorbers that can be used include salicylic acid, benzophenone-based, penzotriazole-based, and cyanoacrylate-based UV absorbers. Other features and advantages of the invention will become apparent from the following description with reference to the embodiments of the accompanying drawings. (
Embodiment> Fig. 1 shows the entire instant color toning type coating system according to a preferred embodiment of the present invention. 12, a color discrimination device 114 for reading the color of the primary color painted product 13 coated with the primary color for toning, a computer 20, a painting robot 40 holding a continuous type inkient device 30, and a control device 45. ing. Color discrimination device I! 14 can be replaced with a video camera 16 if necessary. The head section 50 of the inkjet device includes an ejection nozzle 51
, a charging electrode 52, a deflection plate 53, and an ink receiver 54, which are housed in a case, but the case is omitted from illustration to make the explanation easier to understand. Ink is always ejected from the ejection nozzle 51, and when there is no need to spray the ink onto the object 55, the ink collides with the ink receiver 54 and is collected. When spraying ink onto the object to be coated 55, an electric field is applied to the ink as it travels between the deflection plates 53 to change the trajectory of the ink, causing the ink to come off the ink receiver 54 and toward a predetermined direction. It is blown away and heads towards the object to be coated 55. In this embodiment, arms 31, 32, 33, and 34 are attached to four painting robots 40, respectively, and the head portion 50 of each arm has colors corresponding to four colors of ink: white, red, blue, and yellow. It can be sprayed. The four 7-arms 31, 32, 33, and 34 are movable in three directions, XYZ, and the direction and spray pattern of the ink emitted from the spray nozzle can be changed, making it possible to paint over a wider area. In the apparatus of this embodiment, painting of the same color as the color sample 11 is performed on the object 55 as follows. First, the color discrimination device 14 optically decodes the color of the color sample 1l, separates the colors into three primary colors, for example, red, green, and blue, converts their sizes into signals, and sends this signal to the computer 2.
Enter 0. A huge amount of color data is stored in advance in the computer 20, and a similar color is selected from among the base colors (theoretical values) necessary to reproduce the color of the color sample 12. , the injection amount (theoretical value) of a single or multiple primary colors is calculated using an internal calculation circuit. Here, for example, spray coating is used to coat the object,
For example, by uniformly applying a base color on a stainless steel plate,
The shape of the base color painted object 12 is determined. In reality, the color of the colored object l2 does not match the theoretical value of the base color, so the color discrimination device 14 is used to optically decode the color (actual value) of the colored object l2. , and inputs the signal to the computer 20 as correction data. Meanwhile, inside the computer, the primary color injection amount (theoretical value) calculated using the true output circuit described above is converted into a toning signal. This is to operate the inkjet device and convert it into a signal to obtain the desired color, and it measures the type of paint spray gun, arm movement distance, spray nozzle diameter, spray time, number of repetitions, etc. Collect and convert into a signal.
These conversions are handled by the computer's internal software, and you can also use your computer's keyboard to make various modifications to the color swatches. Here, the base color colored object 12 is set at the position of the object 55, and painting by the inkjet device 30 is started. The signals converted as described above inside the computer are sent to the injection and drive control device ffi through cables 21 and 22.
45, the injection of each injection nozzle is controlled via a cable, and each arm 31, 32, 3 of the robot 40
3.34's movement in the XYZ directions is controlled, and the ink color is applied at a predetermined position. For example, if the color sample 11 is pink and the base color is white, red paint is sprayed from the head portion 50 of the arm 32 and applied onto the object 12 in the form of fine dots. ．． As the amount of red dots attached increases, the white area of the base color decreases, and the color gradually becomes reddish pink. When a predetermined amount of spraying is reached, the dot spraying is stopped according to instructions from the computer, and a primary color coated product 13 is obtained. Here, the color discrimination device 214 is used to optically decode the color (actual value) of the primary color painted product 13, and the signal is sent to the computer 21.
Input this data as correction data. At this time, if the color (actual value) of the primary color painted product 13 is within a predetermined tolerance with respect to the color of the color sample 1l, the color matching operation is completed. If it is not within the specified tolerance, the color of the base color painted product input inside the computer (actual value)
With reference to the data on the color of the primary color painted product (actual II value), calculate the amount of additional primary color to be sprayed to confirm the color of the color sample. Based on this calculation result, the first primary color coated article 13 is set at the position of the object to be coated 55, and the inkjet device 30 is again
Painting will be carried out. By repeating the above operations, the color of the primary color painted product will fall within the tolerance of the color sample, and the color toning operation will be completed. When painting with two or more primary colors, the inkjet device 30 is used in the same manner to eject multiple inks, measure the color of the primary color coated product, and repeat the correction operation.
A painted product that is close to the specified color sample can be obtained. By the above operations, color toning is instantaneously carried out on the object to be coated, eliminating the need for the conventional process of mixing and stirring ink in a container. FIG. 2 shows the entirety of an instant color toning type coating system according to another embodiment of the present invention. and a color discrimination device 14 for reading the color of the primary color painted product 13 coated with the primary color for toning, and a computer 20.
and an electrostatic coating machine 60. As is well known, in the electrostatic coating machine 60, an object 62 to be coated is conveyed along a conveyor 61 and enters a coating booth 63, and when it reaches a coating position near the center, it is driven in the vertical direction by a reciprocating device 64. Paint is sprayed from the paint spray gun 65, and adheres to the object 62 to be coated, which has been electrically charged by the high-pressure generator 66, thereby performing painting. Paint is sprayed using an injection control device.
67, and the drive of the reciprocating device f64 is controlled by a drive control device 68. In this embodiment, four paint injection guns 71, 72, 73. move sequentially in a predetermined direction and spray paint over a predetermined period of time. However, if necessary, each paint spray gun can be held in an independent reciprocating mount and paint can be sprayed from two or more spray guns at the same time. Based on this configuration, the color of the color sample is read in the same manner as explained with reference to FIG. It's coming. Similarly, a signal regarding the injection amount of the primary color calculated by the computer is transmitted to the injection control device 67 and the drive control device W68, and the reciprocating device 64 is activated to control the injection gun 71.72.
, 73 and 74 are moved, and when they reach a predetermined position, a predetermined paint is sprayed. For example, when the color of the color sample is green, the aluminum plate 62 colored with yellow as the base color is transported on the conveyor, and blue paint is sprayed in dots from the third spray gun 73. This results in a primary color painted product toned to green. In the above example, the data was used to read and correct the color of the base color colored product, but the data obtained by reading the color of the base color colored product was input into a computer and the initially calculated primary color injection amount was corrected. However, it is also possible to produce primary primary color coated products using this modified primary color injection amount. Which method is better should be determined comprehensively by considering the time it takes for the paint to dry and the order of the steps. (Experimental example) As a result of painting using the instant color toning type painting method according to the present invention, the following specific example of painting was obtained. Experimental example 1 The color of the color sample is pink. Using the device shown in Figure 1, the colors of the color samples were read and input into a computer for calculation.
The computer selected white as the base color and red as the primary color, and calculated the injection amount of red. Following these instructions, uniformly paint white as a base color on the stainless steel plate, read the color of the white-painted object, input that data into Conview, and then apply the specified color onto the colored object. The primary color of red was painted with an injection amount of . As a result of reading the color of the primary color painted product, which had started to appear pink, it was found that red was insufficient, so as a result of painting red primary color with an additional injection amount calculated by the computer, A pink painted product that almost matched the color sample was obtained. In addition, the multi-light source spectrophotometer MSC manufactured by Suga Test Instruments Co., Ltd.
When measuring the color difference with the color sample board using Type-1,
The color difference ΔE of the first primary color painted product was 0.6, and the color difference ΔE of the final painted product was 0.1. Experimental example 2 The color of the color sample is green. Using the device shown in Figure 1, the colors of the color samples were read and input into a computer for calculation. The computer selected yellow as the base color and blue as the primary color, and calculated the amount of blue to be sprayed. Following these instructions, uniformly paint yellow as a base color on a stainless steel plate, read the color of the yellow painted object, input that data into the computer, and then apply the specified color onto the colored object. The primary color of blue was painted using the amount of spray. As a result of reading the color of the primary color painted product, which had started to appear green, it was found that blue was insufficient, so as a result of painting the primary color of blue with an additional injection amount calculated by the computer, the color A green painted product was obtained that almost matched the sample. In addition, when the color difference with the color sample board was measured using the multi-light source spectrophotometer described above, the color difference ΔE of the primary color painted product was
was 0.7, and the color difference ΔE of the final painted product was 0.2. Experimental example 3 The color of the color sample is purple. Using the device shown in Figure 1, the colors of the color samples were read and input into a computer for calculation. The computer selected blue as the base color and red and yellow as the primary colors, and calculated the amounts of red and yellow to be injected, but it turned out that only a small amount of yellow was needed. Therefore, after uniformly painting blue as a base color on a stainless steel plate, reading the color of the blue-painted object and inputting that data into a computer, a nozzle with a diameter of 60 μm was applied to the colored object. The primary color of red was painted using a predetermined spray amount using a nozzle with a diameter of 30 μm, and then the primary color of yellow was painted using a nozzle with a diameter of 30 μm. As a result, a yellowish-purple painted product that almost matched the color sample was obtained. The color difference ΔE from the color sample was -0.1. In addition, in order to compare with this, the primary color red is '! !
After that, when I painted yellow using a nozzle with a diameter of 60 μm, the color difference ΔE between the painted product and the color sample was +0.
It was 5. Experimental example 4 The color of the color sample is beige. The device shown in Figure 1 was used to read the colors in the color sample, and a computer was used to manually calculate the colors.
The computer selected white as the base color and yellow, red, and blue as the primary colors, and calculated the injection amounts of yellow, red, and blue. Furthermore, when we calculated the area ratio of each color, we found that white, yellow, red,
The ratio of blue is 1: 0.5: 1.2: 0.1
It turned out to be. Therefore, we painted a meter of white as a base color on a stainless steel plate, and applied a diameter of 120 mm on top of that.
A primary color of red was painted using a nozzle with a diameter of 60 μm at a predetermined spray amount, a primary color of yellow was painted using a nozzle with a diameter of 60 μm, and a primary color of blue was painted using a nozzle with a diameter of 30 μm. As a result, a beige painted product that almost matched the color sample was obtained. Color difference ΔE from color sample is -0.1
Met. In addition, to compare with this, use the primary color of white! ! ! After that, red, yellow, and blue were painted using nozzles with apertures of 60 μm, and the color difference ΔE between the painted product and the color sample was -0.7. In order to confirm the effects of the present invention,
The method of toning using a pink color sample according to the present invention, and C
In the CCM method, which was compared with the CM method, the color toning work was performed in the following order. 1) Measure the spectral reflectance of the color sample with a spectrophotometer and input it into the computer. 2) Specify the basic data of the target paint on the computer, such as the type of paint and the type of primary color. 3) A computer calculates the combination of primary colors and the amount of primary colors from the spectral reflectance of the color sample and the basic data of the specified paint. 4} Create a paint sample using the formulation output from the computer and create a painted plate. 5) Measure the spectral reflectance of the painted plate, and use the computer to calculate the corrected formulation based on the difference with the spectral reflectance of the color sample. 6) Repeat steps 4 and 5 above 1 to 3 times, and if the difference between the color sample and the sample is within the allowable limit, finish the work. According to this experiment, the CCM method required three toning operations and approximately 100 minutes from color analysis to determining the amount of primary colors. In the method of the present invention, only one or two toning operations are required, and since a large number of primary colors can be prepared in advance for the object to be coated, the toning operation itself can be shortened to about 15 minutes. Ta. In addition, it was found that the CCM method requires the preparation of a number of containers, making the work cumbersome, and also has the drawback of paint scattering around the work area. (Effects of the Invention) As explained in detail above, according to the present invention, there is no need to mix primary color paints in a container, so the work is significantly simplified and speeded up. Since items can be prepared in advance, time spent waiting for drying can be saved.As the entire process is automated, there is no need for skilled technicians, and the painting can always be completed with stable quality. , its technical effects are extremely remarkable.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the entire instant color toning type coating device according to the present invention using an inkjet device, and Fig. 2 is an electrostatic f
1! 1 is a perspective view showing the entire instant color toning type coating system of the present invention using a coating device. l1... Color sample 12... Base color colored object l3... Painted product l4... Color discrimination device 20.
...Computer 21.22...Cable 30...Inkient device 31, 32.33.34...Arm 36...Spray nozzle 40...Painting robot 45...Control device 51.
...Injection nozzle 55...Object to be coated 60...Electrostatic coating machine 62...Object to be coated 64...Reciprocating device 67.68...Control railing

Claims (1)

[Scope of Claims] 1. A color sample (A) drawn in one color with no pattern, a coating object (B) coated with a predetermined base color, and a primary color for toning on the coating substrate. a detection means for optically detecting the coated object (C) and reading it as a color signal; a color sample (A) obtained by the detection means;
A computer that inputs data about B) and the painted product (C), and reproduces the color of the color sample (A) by comparing the data input inside this computer with the data input into the computer in advance. a calculation circuit that calculates the injection amount of a single or multiple primary colors necessary for the purpose of the paint injection; and an injection control means that energizes the plurality of paint injection guns and injects the calculated primary color injection amount from each injection nozzle in a dot pattern. , holding each of the paint spraying guns and directing each paint spraying gun to the object to be coated (
B) or a moving means for moving relative to the painted product (C), and a drive control means for controlling the moving direction and moving distance of each paint spraying gun in cooperation with the spraying control means, The primary color particles for toning are applied to the object to be coated (B) or the painted object (
C) Instant color toning characterized by being painted in dots on the top and reproducing the color of the color sample (A) by a combination of the color before spraying and the sprayed dots of the primary color. Mold painting equipment. 2. Galvanized steel sheet, plastic film, glass,
A base color is applied uniformly onto a coated object made of stainless steel plate, aluminum plate, paper, cloth, or a pre-coated plate of these, and then a single or multiple primary colors for blending are applied in dots on top of the base color. This is an instant color toning type painting method that reproduces the color of a color sample by combining dots of a base color and a primary color for toning on the object to be coated. The color of the base color programmed in the computer and the injection amount of one or more primary colors are calculated and transmitted to the paint injection type coating machine, and the object to be coated is prepared evenly coated with the base color, and then A paint spray gun equipped with each primary color is used to spray each primary color in dots onto the object to be painted to create a primary color painted item, and a colorimeter is used to measure the color of the primary colored painted item and the color of the sample color is measured. This is an instant color toning type that reproduces the color of the color sample by comparing the difference between the colors and inputting the difference into a computer and spraying the necessary additional amount of each primary color in a dot pattern toward the object to be coated. Painting method.