JPS61204066A - Toning method for paint - Google Patents

Abstract

PURPOSE:To tone so as to obviate a color deviation in a painted product by changing a hue standard from a hue standard plate to a standard plate for toning according to the kind of a painting gun to be used for toning and the quality of a material to be coated. CONSTITUTION:Varnish, pigment, solvent and additives are put into a vessel 8 and the mixture composed thereof is trially painted without toning on a specimen 9 made of the same steel as the steel of a body by an electrostatic painting gun 6 of a painting stage 3 while the hue is compared with the hue standard plate 10 in a stage 1 for producing a reference paint in a toning method for paint. Colorimetry 18 is repeated until the reference paint 11 for toning is obtd. The paint 11 is sprayed to a steel specimen 15 by an air spray gun 14 and the standard plate 12 for toning in a stage for producing the paint for production. The paint is prepd. in a vessel 14 in the same manner as in the stage 1 and is sprayed to the specimen 15 by the gun 4. The hue is compared with the plate 12 and is toned to meet the same, by which the paint 16 for production for a stage 3 obtd. The matching of the hue of the coated film is thus made easy.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for adjusting the color of paint.

(Prior art) The paint used in the painting process of the production line is toned in advance using a hue standard plate (color sample) in the paint manufacturing process so that the desired hue appears when applied to the object to be coated. It is. In other words, this color matching involves actually painting a sample with paint obtained by dispersing pigments, comparing the hue of this painted board with a hue standard board, and re-creating a painted board by supplementing the missing colors. This is done by repeatedly comparing the results.

However, in the paint manufacturing process, a hand-blown air spray gun is usually used for color matching, and in the painting process, an electrostatic atomizing gun, such as a mini-bell type, is usually used. Paint guns vary in the atomization state of the paint, and are also affected by the presence or absence of electrical charge, resulting in subtle differences in the hue of the paint film even when the same paint is used. Therefore, even if the above-mentioned air spray gun is used to adjust the color, when electrostatic painting is actually performed in the painting process, a coating film that does not match the hue of the hue standard board may be formed on the object to be coated. .

Such problems also occur when the material of the test scissors used for color matching in the paint manufacturing process and the material of the object to be coated in the painting process are different. In other words, test pieces of steel plates are generally used for the above color toning, but when applying this toned paint to plastics in the painting process, for example, the effect of the solvent on the coated object is different between steel plates and plasticine. In addition, there is also the effect of a difference in interfacial tension between the paint and the object to be coated during drying, so that the state of the paint film is not the same, which tends to cause color shift.

A particular problem with the conventional color matching method is, for example, when seven products are assembled by assembling steel plate parts and plastic parts, each painted using the same paint. In other words, for steel plate parts, the difference in paint guns used in the paint manufacturing process and the painting process mentioned above causes color deviation from the hue standard plate, and on the other hand, even for plastic parts, differences in the material of the object to be coated cause color deviation. By assembling parts that cause color misalignment due to different factors, the resulting product may have a noticeable difference in hue at the boundary between the two parts.

(Objective of the Invention) The present invention is aimed at: - Even if there are differences in the type of painting gun used in the paint manufacturing process and the painting process and the material of the object to be coated, The aim is to provide a color matching method.

(Structure of the Invention) The present invention provides trial coating of a toning pot in the paint manufacturing process,
In cases where at least one of the coating gun used and the material of the object to be coated is different between the coating in the production line coating process, the following color matching method is used.

(b) First, using a sample made of the same material as the object to be painted and the same painting gun, the color matching standard paint is sprayed and the color of this standard paint is compared by comparing the hue with the hue standard board. Let's do it.

(middle) Next, using the toned reference paint of (a), create a toning standard board using the same painting gun and material of the object to be coated as in the paint manufacturing process.

(c) Then, the color of the paint used in the painting process is adjusted using this color-adjusting standard board.

That is, in the present invention, in order to perform color toning under painting conditions different from the painting process, the hue standard is converted from a hue standard board to a standard board for color toning, and the paint toned in (c) is used. If the coating is applied according to the coating conditions of the coating process, a coating film that matches the hue of the hue standard plate will be obtained, so to speak, the hue will be reversely converted.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

One example/one example is shown in Fig. 1 and Fig. 2, and the type of paint gun used is different between the trial coating of the toning pool in the paint manufacturing process and the painting in the painting process of the production line. This is a case where there is a difference. That is, in this example, as shown in Figure 1,
It consists of three processes: standard paint manufacturing process 1, production paint manufacturing process 2, and painting process 3. Air spray gun 4 is used for trial coating in production paint manufacturing process 2, and painting process 3
In this case, an electrostatic coating gun 6 is used to paint the body 5 of an automobile. FIG. 2 shows the entire process of this example in the form of a flowchart.

First, in the standard paint manufacturing process 1, phenol, pigment, solvent, and additives are placed in a container 8 equipped with a stirrer 7, dispersed and stirred, and a trial coat is performed using the obtained unmixed paint (
Step ■, ■). In this trial coating, an electrostatic coating gun 6 of the same type as that used in coating process 3 was used, and the test piece 9
is made of the same steel as the car body 5. Then, the hue of sample 9 obtained by this trial painting is compared with that of hue standard plate 10, and the addition (toning) of each primary color enamel (or primary color MilPace) of the missing color is carried out until the hues match. Paint and repeat color comparison 18 (steps ■ to ■).

In this case, the hue of the hue standard board 10 is determined at the stage of designing the automobile. In this process, the reference paint 11 for toning used in the next production paint manufacturing process 2 is obtained in this way.

Next, in the production paint manufacturing process, a standard plate 12 for toning is created by spraying the toned standard paint 11 onto a steel specimen with an air spray gun 4 (step 1).
). That is, the creation of this standard board 12 for color toning is for converting the hue standard 19 from one for an electrostatic coating gun to one for an air spray gun for color toning in production paint manufacturing.

Then, as in the case of the reference paint manufacturing process 1, a paint is made by putting phenol etc. into a container 14 equipped with an agitator 16, and the paint is sprayed onto a steel specimen 15 with an air spray gun 4 to determine the hue. Next, compare the hue with the hue of the standard board 12 for color toning, and repeat the addition of each missing primary color enamel, trial coating, and color comparison 20 until the hues match to complete the color toning. , obtain the production paint 16 to be used in the painting process 3 and deliver it to the painting process 3 (step @ l
).

In the painting process 3, the circulation device 17
The viscosity of the production paint 16 is adjusted at the paint station, and the electrostatic paint gun 6 is used to paint the steel body 6 of the automobile being transported to the painting station (step ■, [phase]).

Therefore, in the coating process 3, the same electrostatic coating gun 6 as used in the standard paint manufacturing process 1 is used instead of the air spray gun 4 used in the production paint manufacturing process 2, so that the same paint can be used. This means that the hue has been reversely converted, and the hue of the coating film on the body 5 matches that of the hue standard plate 10.

An example! One example is shown in FIG. 3, in which the materials to be coated are different between the test coating for toning in the production paint manufacturing process 22 and the coating in the coating process 23 of the production line. That is, in this example, a plastic fascia 24 of an automobile is painted with an air spray gun 4 in a painting process 23. Each step will be explained in order below.

In the reference paint manufacturing process 21, the stirrer 2 is
Phenol etc. are put in a container 26 equipped with 5 to make a paint,
This paint is sprayed onto the plastic sample 27 using the same air spray gun 4 as used in the painting process 26, the color comparison 65 is performed with the hue standard plate 10, and the process of adding primary color enamel of the missing color is repeated. It is obtained by toning the reference paint 28 of .

In the production paint manufacturing process 22, the reference paint 28 is sprayed onto the same steel plate as the test piece used for trial painting of the toning pot to create a toning standard plate 29. This color matching standard plate 29
The purpose of the preparation is to convert the hue standard 36 from one for plastics to one for steel specimens in order to adjust the color in production paint manufacturing.

Then, the paint is made in a container 32 equipped with an agitator 31.
The paint used on the production line is sprayed onto a steel specimen 30 with an air spray gun 4, compared 37 with the color matching standard plate 29, and then the missing primary color enamel is added. Obtained by toning 36.

In the painting step 23, the toned production paint 33 is applied to the circulation device 64 to adjust its viscosity, and then applied to the plastic face 24 of the automobile using the air spray gun 4. Therefore, the hue of the coating is reversed from that for steel plates to that for plastics, and the hue of the coating film on the fascia 24 matches that of the hue standard plate 10.

However, when the fascia 24 obtained in the painting process 23 of Example 2 is assembled to the body 5 obtained in the painting process 3 of the above Example/, the hue will be different because the same hue standard plate 10 is used for both parts. They match, and there is no color shift at the boundary between the two parts.

Note that the above-mentioned embodiments differ only in either the coating gun used in the paint production process or the coating process or the material of the object to be coated, but even if both are different, if the present invention is applied, color misregistration can be avoided. It will be resolved.

(Effects of the Invention) According to the present invention, the hue standard is converted from a hue standard board to a standard board for color matching in accordance with the type of painting gun used in the paint manufacturing process and the material of the object to be coated. Therefore, even if the coating conditions differ between the paint manufacturing process and the painting process, it is easy to match the hue of the coating film obtained in the coating process with the hue of the hue standard plate.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a process diagram showing aspects from paint production to painting in the embodiment, FIG. 2 is a flow diagram on the same side, and FIG. FIG. 2 is a diagram similar to FIG. 1; 1.21... Standard paint manufacturing process, 2.22...
...Production paint manufacturing process, 3.23...Painting process, 4...Ass gray gun, 5...
...Steel body, 6...Electrostatic painting gun, 9.1
5.30...Steel specimen, 10...Hue standard plate, 11.28...Standard paint, 12.29
・・・・・・Standard board for color toning, 16.33・・・Paint for production, 19.36・・・Hue standard conversion, 24
・・・・・・Plastic fascia patent applicant Mazda Motor Corporation (r〜゛−・・Representative)
People 1) Kiyoshi Naka -1°? →□− Broom 3 Figure 2 Figure 1

Claims (1)

[Claims] (1) Trial coating for color matching in the paint manufacturing process,
If at least one of the paint gun used and the material of the object to be coated is different between the painting in the painting process of the production line, the same paint gun used in the painting process is applied to a specimen made of the same material as the object to be painted in the painting process. The standard paint for color toning is sprayed using the same paint gun as in the paint manufacturing process. A method for toning a paint, which comprises preparing a color toning standard plate from the material of the object to be coated, and using the color toning standard plate to adjust the color of the paint used in the painting process.