JP3653953B2 - Maskingless two-tone painting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-tone coating method used for top coating of an automobile body, and more particularly to a two-tone coating method that does not require masking.
[0002]
[Prior art]
For passenger cars, recreational vehicles (RV), one-box cars, and the like, two-tone coating aiming at a design effect is widely adopted.
In the conventional two-tone coating method, as shown in FIG. 6, the body on which the intermediate coating has been completed is carried into the top coating booth, where first the top coating A, which is the first color, is applied.
[0003]
As shown in the figure, in the two-tone coating type in which the body is painted up and down, the lower color is usually the first color. When the first color top coat is a so-called two-coat one-bake type metallic paint, the clear paint is applied wet-on-wet after a predetermined flash time after applying the base paint. The body to which the first color top coat A has been applied in this way is conveyed to a drying furnace and baked.
[0004]
When the first color overcoating is completed, the body is transported again to the front of the topcoating booth, where the first color coating area is masked. This masking is performed manually by first attaching the heat-resistant masking tape 1 to the parting line and covering the heat-resistant masking paper 2 thereon.
[0005]
The body whose first color area is masked is again carried into the top coat booth, and this time, the second color top coat B is applied. Then, the body is conveyed again to the drying furnace, where the second color top coat B is baked, and then the masking paper 2 and the masking tape 1 are peeled off. Thus, a two-tone painted vehicle is manufactured in which the lower part of the body is first color A and the upper part of the body is second color B.
[0006]
[Problems to be solved by the invention]
However, the conventional two-tone coating method has the following problems.
First, the masking operation of the first color is performed by hand because it is extremely difficult to automate, but this operation time is extremely long as an average of 20 to 30 minutes / unit. The longer the masking time, the higher the work cost and the very expensive coating specifications.
[0007]
Further, since the above-described masking tape and masking paper pass through the top-drying oven, a high heat-resistant material that does not shrink even at a temperature of around 200 ° C. is necessary, and the cost of auxiliary materials such as masking material is inevitably high. .
[0008]
On the other hand, a sharp parting line is produced with a masking tape, but since this is performed manually, a quality defect is likely to occur regarding the parting line such that the parting line is bent or the coating film is missing at the parting line. Once a parting failure occurs, retouching is extremely difficult, and in some cases, it is necessary to sand and remove the first color and the second color and then repaint from the first color.
[0009]
The present invention has been made in view of such problems of the prior art, and does not require masking with high work cost and secondary material cost, and is a two-tone coating method that is excellent in quality and design. The purpose is to provide.
[0010]
[Means for Solving the Problems]
To achieve the above object, the two-tone coating method according to claim 1 is a two-tone paint method painted separately body to two-color, after applying a first top coat, the second topcoat wet on wet In the two-tone coating method in which a coating material is applied and these are simultaneously baked , when the second top coating material is applied, an overspray prevention shielding plate is provided in the vicinity of the parting line of the vehicle body with a slight gap, and the first color region It is characterized by supplying air into the gap .
[0011]
In the two-tone coating method according to the first aspect, the first color and the second color are applied by wet-on-wet and baked at the same time, thereby producing a two-tone coating vehicle, so that the masking operation that has been conventionally required is unnecessary. Thus, no auxiliary material such as a masking material is required. Therefore, the cost can be reduced by the masking operation cost and the masking material cost. In addition, since two-tone coating can be obtained by only one pass of the top coating process, the time required to complete coating can be shortened, contributing to shortening the delivery time.
In addition, when applying the second top coat, a shielding plate for preventing overspraying is provided with a slight gap near the parting line of the vehicle body, and air is supplied to the gap from the first color region, so that it is concealed from the body. Overspray of the second color paint from the gap with the plate is suppressed.
[0012]
The two-tone coating method according to claim 1 includes both 1C1B type paint such as solid paint and 2C1B type metallic paint, but the two-tone coating method according to claim 2 is a two-color, two-coat, one-bake type. A two-tone coating method in which a vehicle body is painted using a metallic top coating, and after applying a base coating of a first top coating, a base coating of a second top coating is applied wet-on-wet, and these first coatings are further applied. The base paint of the second top coat is applied in a two-tone coating method in which the clear paint is applied wet-on-wet onto the base paint of the second top coat and then the base paint and the clear paint are simultaneously baked. In order to prevent overspraying, provide a shielding plate near the parting line of the car body with a slight gap. Together, characterized in that for supplying air into the gap from the first color regions.
[0013]
In the two-tone coating method according to claim 2, when both the first color and the second color are 2C1B type metallic paints, the base paints of the first color and the second color are applied wet-on-wet, and further wet-on-wet Since the clear paint is applied to the whole and then baked at the same time, a two-tone painted car is manufactured, so that the masking work required conventionally is unnecessary, and no auxiliary materials such as a masking material are required. Therefore, the cost can be reduced by the masking operation cost and the masking material cost. In addition, since two-tone coating can be obtained by only one pass of the top coating process, the time required to complete coating can be shortened, contributing to shortening the delivery time.
In addition, when applying the second top coat, a shielding plate for preventing overspraying is provided with a slight gap near the parting line of the vehicle body, and air is supplied to the gap from the first color region, so that it is concealed from the body. Overspray of the base coat of the second color from the gap with the plate is suppressed.
[0014]
In the two-tone coating method according to claim 1 or 2, the boundary between the first color and the second color, that is, the sharpness of the parting portion is not particularly limited, but the two-tone coating method according to claim 3 is provided near the parting line. A blur region is formed. By deliberately blurring the parting line, masking is not necessary, and design effects such as the addition of a soft image with a “blurred pattern” can be expected.
[0015]
In the two-tone coating method according to any one of claims 1 to 3, although the coating conditions of the first color and the second color are not particularly limited, the two-tone coating method according to claim 4 includes: The discharge amount of the base paint of the second topcoat paint is 50 cc / min to 150 cc / min.
[0016]
This is because if the discharge rate is less than 50 cc / min, a sufficient film thickness cannot be ensured, and the coating time becomes long in order to ensure a sufficient film thickness. On the contrary, if the discharge rate is 150 cc / min or higher, overspraying on the other side of the color becomes remarkable and the design and quality are not established.
[0020]
In the two-tone coating method of claim 1, wherein, not particularly limited as spray gun which can be used, air spray gun, airless spray gun, air mix cancer, there may be mentioned such as small Berugan, claim 5. The two-tone coating method according to 5 , wherein an airbrush gun is used as a coating gun when applying the second top coat or the base paint of the second top coat.
[0021]
By using a combination of the airbrush gun, a small gun formed by bundling the airbrush gun, or the above-described various coating guns, the second color overspray can be prevented more reliably.
[0022]
【The invention's effect】
According to the two-tone coating method of the first or second aspect, a masking operation that has been conventionally required is not required, and a secondary material such as a masking material is not required. Therefore, the cost can be reduced by the masking operation cost and the masking material cost. In addition, since there is no masking, quality problems such as parting failures do not occur. Furthermore, since the two-tone coating can be obtained with only one pass of the top coating process, the time required to complete the coating can be shortened, which can contribute to shortening the delivery time.
Further, overspray of the second color paint from the gap between the body and the concealing plate is suppressed.
[0023]
According to the two-tone coating method described in claim 3, by intentionally blurring the vicinity of the parting line, not only masking becomes unnecessary, but also a design effect such as addition of a soft image by “blurred pattern” can be expected.
[0024]
According to the two-tone coating method of the fourth aspect, by limiting the discharge amount of the second color, it is possible to prevent overspray to the first color and to prevent the occurrence of quality defects such as color skipping. it can. Further, by preventing overspraying, the skin and clarity of the coating film are improved for both the first color and the second color.
[0026]
According to the two-tone coating method of the fifth aspect , since the air brush gun is used as the coating gun, the second color overspray can be prevented more reliably.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a process diagram showing an embodiment of the two-tone coating method of the present invention, FIG. 2 is a perspective view showing an example of a second color base coat application process in the embodiment, and FIG. 3 is a diagram of the second color base coat application process. FIG. 4 is a perspective view showing an example of a coating gun used in the second color base coat coating process.
[0028]
In the following embodiment, a case where a 2-coat 1-bake type metallic paint is used for both the first color and the second color will be described. Further, in this embodiment, a two-tone coating of a type in which the body shown in FIG. 1 is applied vertically at the approximate center of the body side is adopted, and the upper part of the body is described as the first color and the lower part of the body is described as the second color.
[0029]
As shown in FIG. 1A, in the two-tone coating method of the present embodiment, the first color base coat 10 is first applied to an automobile body that has been subjected to electrodeposition coating and intermediate coating. In this step, the base coat 10 of the first color top coat is applied to the entire body. The coating thickness of the base coat 10 alone is not particularly limited, but is preferably 10 μm to 20 μm in a dry state.
[0030]
After applying the first color base coat 10, after a flash time of about 1 to 2 minutes, as shown in FIG. 4B, the second color base coat 11 is applied to the lower part of the body. To do. The coating thickness of the base coat 11 alone is not particularly limited, but is preferably 10 μm to 20 μm in a dry state at a position away from the parting line, and gradually approaches 0 μm as it approaches the parting line.
[0031]
The application of the base coat 11 of the second color is not limited. For example, as shown in FIG. 2, the second color base coat 11 can be applied using a painting robot R in which a painting gun G is attached to the hand H.
[0032]
At this time, in order to prevent the base coat 11 of the second color from being oversprayed on the upper part of the body to which the first color has been applied in the previous step, there is no limitation. For example, as shown in FIG. It is preferable to provide the spray-preventing concealment plate 20 over the front and rear direction of the body. Since the first color 10 is in a wet state, the concealing plate 20 is preferably provided in a non-contact state with a slight gap with respect to the body.
[0033]
Further, when providing the overspray preventing concealment plate 20 or independently, as shown in the figure, air may be supplied from the first color side to form an air curtain that flows from the first color side. By doing so, overspray of the second color base coat 11 from the gap between the body and the concealment plate 20 is suppressed.
[0034]
On the other hand, the coating gun G for coating the base coat 11 of the second color is not particularly limited, and an air spray gun, an airless spray gun, an air mix gun, a small bell gun or the like can be used. It is preferable to use a combination of a small gun G configured by bundling a plurality of airbrush guns G1 as shown in FIG. By using such a small paint gun G, the second color overspray on the upper part of the body can be prevented more reliably.
[0035]
Moreover, the discharge amount of the coating material when applying the base coat 11 of the second color is not limited, but is more preferably 50 cc / min to 150 cc / min. This is because if the discharge rate is less than 50 cc / min, a sufficient film thickness cannot be secured, and if a sufficient film thickness is to be secured, the coating time becomes long. On the contrary, at a high discharge rate of 150 cc / min or more, the overspray on the upper part of the body coated with the first color becomes significant and is not realized in terms of design and quality.
[0036]
At this time, when a coating gun G using an air pressure such as an air spray gun is used, it is desirable that the air pressure be lower than usual.
[0037]
After applying the above-described second color topcoat base coat 11, the clear coat 12 is applied to the entire body with a flash time of about 1 to 2 minutes, as shown in FIG. . The thickness of the clear coat 12 is not particularly limited, but is preferably 30 μm to 40 μm at the upper part of the body and 20 μm to 35 μm at the side part of the body.
[0038]
When the coating of the clear coat 12 in FIG. 5C is completed, it is set in a setting time of 5 to 10 minutes, and then brought into a coating drying furnace, where the baking conditions at 140 ° C. for 20 minutes can be kept, The first color base coat 10, the second color base coat 11 and the clear coat 12 are simultaneously baked.
[0039]
The two-tone coating thus obtained has a novel design effect in which the first color base coat 10 and the second color base coat 11 are blurred in the vicinity of the parting line, as shown in the right figure of FIG. Therefore, it is possible to provide a soft image or a warm image compared to the conventional sharp two-tone coating.
[0040]
In addition, since it is basically a masking-less construction method, the cost can be reduced by the masking work cost and the masking material cost. In addition, since a sharp parting line is not employed, there are no quality defects such as parting defects at the parting line part and coating film chipping, which frequently occur in the past, and the coating straightness rate is improved in each stage.
[0041]
Furthermore, since the two-tone coating can be obtained by only one pass through the top coating booth and the top coating drying furnace, the coating complete straight time is shortened by about 1 hour. As a result, it can contribute to shortening the delivery time of the automobile.
[0042]
The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[0043]
For example, in the embodiment shown in FIG. 1, the base coat 10 of the first color is applied to the entire body, but this is because the concealing power of the top coat 11 of the second color is taken into account. When the hiding power of 11 is strong, it may be applied only to the upper part of the body as shown in FIG.
[Brief description of the drawings]
FIG. 1 is a process diagram showing an embodiment of a two-tone coating method of the present invention.
FIG. 2 is a perspective view showing an example of a second color base coat coating process in the embodiment of the two-tone coating method of the present invention.
FIG. 3 is a perspective view showing another example of the second color base coat coating process in the embodiment of the two-tone coating method of the present invention.
FIG. 4 is a perspective view showing an example of a coating gun used in a second color base coat coating process in the embodiment of the two-tone coating method of the present invention.
FIG. 5 is a process diagram showing another embodiment of the two-tone coating method of the present invention.
FIG. 6 is a process diagram showing a conventional two-tone coating method.
[Explanation of symbols]
A ... 1st color B ... 2nd color 10 ... 1st color base coat 11 ... 2nd color base coat 12 ... Clear coat 20 ... Overspray prevention concealment plate 21 ... Air curtain G ... Paint gun G1 ... Air brush gun

Claims (5)

In the two-tone coating method in which the vehicle body is painted in two colors, after applying the first top coating, the second top coating is applied wet-on-wet, and these are simultaneously baked .
When applying the second top coat , a two-tone is provided, in which an overspray prevention shielding plate is provided in the vicinity of a parting line of the vehicle body with a slight gap and air is supplied to the gap from the first color region. How to paint. This is a two-tone coating method in which the vehicle body is painted using two-color, two-coat, one-bake type metallic topcoat, and after applying the first topcoat base paint, wet-on-wet second basecoat base paint In the two-tone coating method, after applying a clear paint wet-on-wet on the base paint of the first and second top coat paints, and then baking these base paint and clear paint simultaneously,
When applying the base paint of the second top coat, the overspray prevention shielding plate is provided with a slight gap near the parting line of the vehicle body, and air is supplied to the gap from the first color region. Two-tone painting method. 3. The two-tone coating method according to claim 1, wherein a blur region is formed in the vicinity of the parting line. The two-tone coating method according to any one of claims 1 to 3, wherein a discharge amount of the second top coating material and a base coating material of the second top coating material is 50 cc / min to 150 cc / min. 5. The two-tone coating method according to claim 1, wherein an airbrush gun is used as a coating gun when applying the second top coating or the base coating of the second top coating. 6.

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