JPH0520154B2 - - Google Patents

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 toning is
The paint obtained by dispersing the pigment was actually painted on a large sample, and the hue of this painted plate was compared with a hue standard plate.
This is done by repeating the process of supplementing the missing colors, creating another coated plate, and comparing it.

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 differ in the atomization state of the paint, and are also affected by the presence or absence of charging, resulting in subtle differences in the hue of the paint film even when the same paint is used. Therefore, even if the color is toned using the air spray gun mentioned above, when electrostatic painting is actually performed in the painting process, a paint film that does not match the hue of the color standard plate will be formed on the object to be coated. .

Such problems also occur when the material of the test piece 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-mentioned color toning, but when applying this toned paint to plastic in the painting process, for example, the effect of the solvent on the coated object is different between steel plates and plastic, and This also has the effect of causing a difference in interfacial tension between the paint and the object to be coated during drying, and the condition 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 a steel plate part and a plastic part, each painted using the same paint, are assembled into a single product. 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 board, 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 misregistration due to different factors, the resulting product may have a noticeable difference in hue at the boundary between the two parts.

(Purpose of the Invention) The present invention provides a system that does not cause color deviation from the hue standard plate of the painted product even if there are differences in the type of painting gun used in the paint manufacturing process and the painting process or in the material of the object to be coated. This paper aims to provide a method for toning.

(Structure of the Invention) The present invention provides that at least one of the painting gun used and the material of the object to be coated is different between trial painting for color matching in the paint manufacturing process and painting in the painting process of the production line. In this case, the following toning method is used.

(a) First, using a sample made of the same material as the object to be painted and the same painting gun, the color of the reference paint is adjusted by spraying the color-matching reference paint and comparing the hue with a hue standard board.

(b) Next, using the toned reference paint of (a), create a standard plate for toning 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 standard plate for color adjustment.

That is, in the present invention, in order to perform color toning under different painting conditions from the painting process, the hue standard is converted from the hue standard board to the color toning standard board, and the paint toned in (c) is used. If the coating is performed 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) Hereinafter, an example of the present invention will be described based on the drawings.

Example 1 This example is shown in Figures 1 and 2, and the type of paint gun used is different between trial painting for color matching in the paint manufacturing process and painting in the painting process of the production line. This is the case. That is, in this example, as shown in FIG.
In the production paint manufacturing process 2, an air spray gun 4 is used for trial coating, and in the painting process 3, an electrostatic coating gun 6 is used to paint the car body 5.
is used. FIG. 2 shows the entire process of this example in a flowchart.

First, in the standard paint manufacturing process 1, varnish, pigment, solvent, and additives are placed in a container 8 equipped with an agitator 7, dispersed and stirred, and a trial coating is performed using the obtained unmixed paint (step, ). In this trial coating, the same type of electrostatic coating gun 6 as used in the coating process 3 is used, and the test piece 9 is made of the same steel as the car body 5. The hue of sample 9 obtained from this trial painting is compared with that of hue standard plate 10, and each primary color enamel (or primary color mill base) of the missing color is added (toning) until the hues match. Paint and repeat color comparison 18 (step ~). 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, the color-adjusted reference paint 11 is sprayed onto a steel specimen by the air spray gun 4 to create a color-adjustment standard plate 12 (step). That is, the purpose of creating this standard plate 12 for color matching is to convert the hue standard 19 from an electrostatic coating gun to an air spray gun for color matching in production paint manufacturing. Then, as in the case of the reference paint manufacturing process 1, a paint is prepared by putting varnish or the like into a container 14 equipped with an agitator 13, and the paint is sprayed onto a steel specimen 15 using an air spray gun 4 to adjust its hue. Next, compare the hue with the color matching standard plate 12, and add each missing primary color enamel until the hue matches.
Trial coating and color comparison 20 are repeated to complete the color matching (step ~), and a production paint 16 to be used in the painting process 3 is obtained, which is delivered to the painting process 3 (step).

In the painting process 3, the circulation device 17 adjusts the viscosity of the production paint 16, and the electrostatic painting gun 6 applies paint to the steel body 6 of the automobile being transported to the painting station. (Step,). Therefore, in this painting process 3, the same electrostatic painting gun 6 as used in the reference paint manufacturing process 1 is used in place of the air spray gun 4 used in the production paint manufacturing process 2, so that the same paint can be used. Therefore, the hue of the coating film on body 5 is determined by the hue standard plate 10.
matches that of

-Example 2- This example is shown in FIG.
This is a case where the materials to be coated are different between the trial coating for color matching in step 2 and the coating in the coating process 23 of the production line. That is, in this example, painting process 2
3, the plastic fascia 24 of the automobile is painted with an air spray gun 4.
Each step will be explained in order below.

In the standard coating manufacturing process 21, as in Example 1, varnish or the like is placed in a container 26 equipped with an agitator 25 to make a coating, and this coating is applied to a plastic specimen 27 using the same air spray gun 4 as in the coating process 23. The color comparison 35 is performed with the hue standard plate 10, and the missing primary color is added to the enamel. This process is repeated to obtain a reference paint 28 for toning.

In the production paint manufacturing process 22, the reference paint 2 is
8 is sprayed onto the same steel plate as the test piece used for trial coating for color toning to prepare a standard plate 29 for color toning.
The purpose of creating this standard plate 29 for color adjustment is to convert the hue standard 36 from one for plastic to one for steel specimens for color adjustment in the manufacturing of production paints. Then, paint is prepared in a container 32 equipped with an agitator 31, sprayed onto a steel specimen 30 with an air spray gun 4, and compared with the standard plate 29 for color matching 37.
Paint 33 used on the production line by repeating the process of adding the missing primary color enamel.
Obtained by toning.

In the painting process 23, the above-mentioned toned production paint 33 is applied.
The viscosity is adjusted using a circulation device 34, and the plastic fascia 24 of an automobile is coated with an air spray gun 4. Therefore, this coating reverses the hue from that for steel plates to that for plastics, and the facia 24
The hue of the coating film matches that of the hue standard plate 10.

Therefore, 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 Example 1, both parts have the same hue standard plate 1.
Since 0 is used, the hues match, and there is no color shift at the boundary between both 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 coating 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 embodiments of the present invention. Fig. 1 is a process diagram showing aspects from paint production to painting in Embodiment 1, Fig. 2 is a flow diagram of the same example, and Fig. 3 is a flow chart of the embodiment 2. FIG. 4 is a side view of the vehicle body to which the fascia is assembled. 1, 21... Standard paint manufacturing process, 2, 22...
Production paint manufacturing process, 3, 23...Painting process, 4
...Air spray gun, 5...Steel body, 6...
...Electrostatic painting gun, 9,15,30...Steel specimen,
10... Hue standard plate, 11, 28... Standard paint,
12, 29...Standard plate for color toning, 16,33...Paint for production, 19,36...Hue standard conversion, 24...
...Plastic fascia.

Claims (1)

[Claims] 1. If at least one of the painting gun used and the material of the object to be coated is different between the trial coating for color matching in the paint manufacturing process and the coating in the painting process of the production line, the object to be coated in the painting process Using the same paint gun as used in the painting process, spray the standard paint for color toning on a specimen made of the same material, and compare the color of the standard paint with the hue standard plate of the object to be coated in the painting process. Create a color matching standard plate using the same paint gun and material of the target material as in the paint manufacturing process using the same standard paint, and use this color matching standard plate to adjust the color of the paint used in the painting process. A method of toning paint characterized by: