JPS61216772A - Multicolor separate coating method - Google Patents

Abstract

PURPOSE:To reduce the number of baking, curing and masking processes of a paint film, in performing multicolor separate painting, by painting a first color paint and second color paint by providing a color mixing region coming to a range coated with a third color paint. CONSTITUTION:In the multicolor separate painting of a car body, at first, a color mixing region coming to a range coated with a third color paint is pro vided to the surface to be painted, to which a chemical forming treatment film 1, an under coat film 2 and an intermediate paint film 3 were applied, to form paint films 4, 5 by a first color paint and a second color paint. Next, after a paint film 6 by a clear paint is formed to the whole of an article to be painted, the whole is simultaneously baked and cured to apply masking materials 7a, 7b to the first and second color paint films 4, 5. Succeedingly, paint films 8, 9 by the third color paint and a clear paint are successively formed to the color mixing region and simultaneously baked and cured before the masking materials 7a, 7b are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for painting the surface of an object to be painted, such as an automatic plant, in multiple colors.

[Conventional technology]

BACKGROUND ART Conventionally, when painting the surface of an object to be painted, such as an automobile body, in multiple colors, it has been carried out by a painting method as shown in the sectional view of FIG.

That is, as shown in FIG. 4(a), the object to be coated is
After forming a chemical conversion coating 51 on the surface of the substrate to improve adhesion, an undercoat coating 52 and an intermediate coating coating 53 are sequentially formed by appropriate means.

Then, a first color coating 54 and a clear coating 55 are formed on the surface of this intermediate coating 53 in the first color coating area A, and both chamber coatings 54 and 55 are simultaneously baked and cured.

Thereafter, the first color painting range A is masked with a masking material 56.

Next, a second color coating film 57 and a clear coating film 58 are formed in the second color coating area B, and both chamber films 57 and 58 are simultaneously baked and cured. Thereafter, the masking material 56 is removed, and the first color painting range A and the second color painting range B are newly masked with a masking material 59, as shown in FIG.

Next, apply the third color “AH*” to the third color painting area C.
While forming GO and clear coating film 61, rainfall amount li [
60 and 61 are baked and hardened at the same time. Thereafter, the masking material 59 in the first color coating area A and the second color coating area B is removed.

As a result, the first color coating film 5 is formed on the surface of the object 50 to be coated.
4. Second color painting III! 57 and third color coating 6
The three-tone color painting, in which 0's are formed one after another, is completed.

[Problem that the invention seeks to solve]

However, in this multi-color painting method, the painting process of spraying, hydraulic hardening, and baking/curing must be repeated for each color, resulting in an increase in the number of painting processes and a decrease in production numbers. Of course, there is a problem that masking must be performed twice for the first color coating 54 and the second color coating 57 when performing separate coating.

Therefore, this invention was made to solve the above-mentioned problems, and when performing multi-color painting, the first color paint and the second color paint are used in the same area as the third color paint. By creating and painting areas with mixed colors,
The aim is to reduce the number of painting processes such as baking and curing of the paint film, masking, etc., as well as to reduce the amount of masking materials, etc.

[Means for solving problems]

That is, in the multicolor coating method according to the present invention, when applying multicolor coating to the surface of the object to be coated, first, a base coating film such as an undercoat film or an undercoat film and an intermediate coat film is formed. A color mixing area is provided on the surface of the object to be painted, which is the coating range of the third color paint, and then the first color paint and the second color paint are applied, and the first color paint film and the second color paint film are coated.
Forms a colored coating.

Next, a clear paint is applied to the entire object to be coated without baking and curing the first color paint film and the second color paint film to form a clear paint film. Thereafter, the first color paint film, the second color paint film, and the clear paint film are simultaneously baked and cured, and the painted areas of the first color paint film and the second color paint film are masked with a masking material.

Next, the third color paint and clear paint are sequentially applied to the color mixed area formed between the first color paint film and the second color paint film. Forms a coating film.

Then, after simultaneously baking and curing the raindrop film, the masking material masking the first color paint film and the second color paint film is removed.

In this invention, the undercoat film or intermediate coat film formed on the object to be coated can be a commonly used undercoat paint or intermediate coat paint. For example, as the undercoat paint, anionic type and intermediate coat paint can be used. Examples include cationic electrodeposition paints, organic solvent paints, water-based paints, and powder paints. In addition, examples of intermediate paints include organic solvent paints, water-based paints, powder paints, and the like. The coating method for these paints is determined by the coating location and coating conditions suitable for each paint. Furthermore, the base coat can be formed by forming only the base coat or by sequentially forming the base coat and the intermediate coat.

In addition, the first color paint, second color paint, and third color paint are commonly used organic solvent-based paints,
Top coats such as water-based paints and powder paints can be used as they are, and these include solid paints, metallic paints, pearlescent paints, and the like. Furthermore, these paints can be applied by adjusting the coating location and coating conditions suitable for each paint.

Further, as the masking material for masking the painted parts of the first color coating film and the second color coating film, general masking materials such as paper, plastic film, and plastic plate can be used as they are.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the multicolor painting method according to the present invention will be described in detail below with reference to the drawings.

The first is an enlarged sectional view for explaining the multi-color separate painting method according to the present invention, FIG. 2 is a plan view of a painting booth used in the multi-color separate paint method according to the present invention, and FIG. 1 shows a side view of an automobile body painted by the multicolor painting method of the present invention.

In FIG. 2 and FIG. 3, reference numeral 20 denotes a top coating coating booth formed in the shape of a tunnel, and one side of the coating booth 20 has an entrance 21a for carrying in an automobile body W, which is an object to be painted. The other side is an exit 21b for carrying out the vehicle body W after the top coating.

Further, the painting booth 20 is a first stage 20a.

The second stage 20b and the third stage 20c are sequentially formed in three areas, and each stage 20a.

20b and 20c are an automatic coating machine 24 a12 consisting of a side reciprocator 22 and a top reciprocator 23.
4 bs 24 C is arranged.

Further, a supply device 25a for supplying organic solvent-based metallic paint is arranged near the first stage 20a, and is connected to an automatic coating machine 24a by a circulation pipe 26a, and is used to coat the first color of paint. It is supposed to be done.

Further, a supply device 25b for supplying an organic solvent-based metallic paint is arranged near the second stage 20b, and is connected to an automatic coating machine 24b through a circulation pipe 26b, and is connected to an automatic coating machine 24b using a paint different from the first color. The second color of paint is applied, and the third color of paint is applied by changing the color.

Further, a supply device 25c for supplying an organic solvent type clear paint is disposed near the third stage 20c, and is connected to an automatic coating machine 24c through a circulation pipe 26c to apply the clear paint. It has become.

In the painting booth configured as described above, the multicolor painting method of the present invention will be explained based on FIGS. 1 to 3.

First, as shown in FIG. 1, dirt such as oil, fat, and dust adhering to the surface of the automatic grass body W is removed, and a chemical conversion coating 11111 is formed on the surface to improve adhesion. An undercoat film 2 and an intermediate coat film 3 are sequentially formed. Next, as shown in FIG. 2, the coating booth 20 is transported from the entrance 21a to the first stage 20a, and the first color coating area A
Spray metallic paint onto the top of the automatic grass body W to form a base paint film of the first color, as shown in Figure 1 (A).
form a cough.

Subsequently, the base coating film 4 of the first color is transported to the second stage 20b without being baked and cured, and the second color is transferred to the second stage 20b by the side reciprocator 22 of the automatic coating machine 24b.
A base coating film 5 of a second color is formed by spraying a metallic paint onto the lower part of the automobile body W, which is a color painting range B. At this time, a color mixing area C, which is the area where the third color metallic paint is applied, is set between the first color paint range A and the second color paint range B, and the second color To prevent the metallic paint to be applied from being sprayed onto the coating range A of the first color.

Then, the base coating film 5 of the second color is carried to the third stage 20c without being baked or hardened, and the entire automobile body W is coated with a clear coat by the side siphon locator 22 and top reciprocator 23 of the automatic coating machine 24c. Spray the paint to form clear coat 11!6.

Thereafter, the coating booth 20 is carried out through the exit 21b and carried into a drying oven (not shown), where the first color base coating 4, second color base coating 5, and clear coating 1lI6 are simultaneously baked and cured. . Then, the automobile body W on which the champion coating film 4.5.6 has been baked and hardened is transported to a masking process (not shown), and as shown in FIG. The base coating film 4 of A and the base coating film 5 of the second color coating area B are masked with masking materials 7a and 7b.

In this state, from the entrance 21a of the painting booth 20 again,
At the same time as transporting to the stage 20b, the automatic coating machine 24b
The side reciprocator 22 sprays the metallic paint after the color change onto the central part of the color mixing area C to form a base paint film 8 of the third color.

Then, the base coating film 8 of the third color is carried into the third stage 20c without being baked or hardened, and the third color base coating film 8 Spray clear paint on top and clear coat 1! Form iI9.

Furthermore, the painted automobile body W is carried out from the exit 21b of the coating booth 20 and carried into a drying oven, where a third color base coating film 8 and a clear coating film 1! +! 9 is baked and hardened at the same time.

Then, the automobile body W on which both coatings yI8.9 have been baked and hardened is carried into a masking process, and the masking material 7a masked on the first color base coating 4 and the second color base coating [45] , 7b are removed.

As a result, as shown in FIG. 1 (c) and FIG. The three-tone color separation painting on which the coating film 5 has been formed is completed.

[Structure of the invention]

As explained above, in the multi-color painting method according to the present invention, when performing multi-color painting, the first color paint and the second color paint are used in the range where the third color paint is applied. Since the parts are provided and painted, the number of times of baking and curing of the paint film and the number of times of masking can be reduced, which has the effect of simplifying the painting process.

In addition, in the multicolor painting method according to the present invention,
By being able to reduce the number of times of baking and curing of the coating film and the number of times of masking, it is possible to significantly reduce costs such as equipment costs, fuel costs, and masking material costs.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view for explaining the multicolor coating method according to the present invention. FIG. 2 is a plan view of a painting booth used in the multicolor painting method according to the present invention. FIG. 3 is a side view of an automobile body painted by the multicolor painting method according to the present invention. FIG. 4 is an enlarged sectional view for explaining a conventional multi-color painting method. 1-----・-Chemical conversion coating 2--Undercoat coating 3--Intermediate coating 4--Base coating of first color 5--Second color Base coating film 6.9 --- Clear coating film 7a, 7b --- Masking material 8-1 --- Base coating film A for third color --- Painting range B for first color・-・-Second color painting area C---・Colored area (third color painting area) Applicant: Toyota Motor Corporation/D (4) (B) (/ri Figure 1, Figure 2 Figure 3 (A) (B) Figure 4

Claims (1)

[Claims] On the surface of the object to be painted on which the base coating film has been formed, a color-mixed area is created which will be the coating range of the third color paint, and after applying the first color paint and the second color paint, the object to be painted is painted. A clear paint is applied to the entire surface, and the paint films formed by the first color paint, second color paint, and clear paint are simultaneously baked and cured, and the first color paint film and the second color paint film are combined. Mask the area to be painted, and then apply the coating film of the first color and the second color.
The multi-color paint is characterized in that after a third color paint and a clear paint are sequentially applied to the color-mixed area of the colored paint film, the paint film formed by both paints is simultaneously baked and cured to remove the masking. Color painting method.