JP2018051515A - Coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating method in which two or more colors can be selectively coated with accuracy without receiving restrictions in a color scheme, and in which excellent color development properties are imparted to any color.SOLUTION: A coating method includes: a step S1 for forming a first film layer 5 with a first color in a coating planned region 1a of the first color among surfaces to be coated; a step S2 for forming a second film layer 7 with a second color in the whole area of a coating planned region 1b of the second color among the surfaces to be coated, after forming the first film layer 5; a step S5 for forming a third film layer 11 with a color of higher brightness than the second color and of higher opacifying power than the first color, on a parting section 10 between the first color and the second color out of the coating planned region 1a of the first color, in a masked state of the second film layer 7; and a step S6 for forming a first film layer 12 in the whole area of the coating planned region 1a of the first color including a region in which the third film layer 11 is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating method, and more particularly to a method for applying multicolor coating such as two-tone coating to a surface to be coated.

  For example, a coating method using a masking tape has been conventionally employed in a process of applying two-tone coating to a steel plate constituting an automobile. This is because a first color coating is applied to the entire surface (surface to be coated) of a coated object such as a steel plate, and then a coating layer formed on the surface to be coated by the first color coating. With the part masked with masking tape, the second color is applied to the unmasked area, and finally a clear paint is applied and baked to form a two-tone coating on the surface to be coated. Yes (see, for example, Patent Document 1).

  If the two-tone coating is applied using the masking tape in this way, the desired range can be accurately applied without mixing the first and second colors. However, in the case of the coating method as described above, the color developability may become a problem depending on the two-tone color scheme.

  For example, if one of the two tones to be painted is a relatively light color such as a black color and the other is a relatively light color such as a white color, After painting to a low color, it is conceivable to mask the area to be finally painted with this low light color with a masking tape and to paint the unmasked area with a relatively light color. However, in this procedure, a low-lightness color coating layer is formed between a coating layer having a high lightness color (a white-colored topcoat coating layer) and an intermediate coating film layer corresponding to a high-lightness color. Since the film layer (black-colored top coat layer) is interposed, it is difficult to obtain the original color developability of a light color. In addition, depending on the two-tone color scheme, a relatively low brightness color (black color) may overlap with a high brightness color (white color), which may cause the white color to appear dark.

  Therefore, the present applicant has proposed a coating method for solving this problem (see Patent Document 2). In this coating method, after the first coating layer having the first color is formed in the first color coating area of the surface to be coated, the second color coating area of the surface to be coated is formed. A second coating layer having a second color is formed over the entire area, and then the first coating layer is overlapped on the first coating layer with the second coating layer masked. To form.

JP-A-5-76820 Japanese Patent Laid-Open No. 2006-137435

  By the way, as described in Patent Document 2, when the surface to be coated is separately applied to the first color and the second color, the second color with relatively low brightness is surely ensured over the entire area to be painted. When trying to apply, a coating layer of the second color may protrude slightly in the adjacent application planned region of the first color. In this case, depending on the hue of the coating layer (first color coating layer) formed on the protruding coating layer, the lower color (second color with relatively low brightness) may be It may be seen through a little, and the original color developability of the first color cannot be obtained. That is, when the first color having relatively high brightness is a color having a relatively high hiding power, such as a white color, there is no particular problem even with the coating method described in Patent Document 2, but the yellow color When the color is relatively high in brightness but low in hiding power, the first color and The lower color may be seen through at the boundary with the second color (so-called parting-out portion), and sufficient color developability may not be obtained for the overcoated color.

  The above-mentioned problems are not limited to the case of applying a two-tone coating, but can occur in the same manner when applying a multicolor coating of three or more colors.

  In view of the above circumstances, the problem to be solved by the present invention is that it is possible to accurately coat two or more colors without being restricted by the color scheme, and impart excellent color developability to any color. It is in providing the coating method which can be performed.

  The solution to the above problem is achieved by the coating method according to the present invention. That is, this coating method is a method for applying a first color and a second color different from the first color to the surface to be coated, and the first color of the surface to be coated After forming the first coating layer having the first color in the planned coating area, and forming the first coating layer, the first coating layer is formed over the entire area of the second coating planned area of the surface to be coated. A step of forming a second coating layer having two colors, and in a state where the second coating layer is masked; A step of forming a third coating layer having a lightness higher than the color and a higher hiding power than the first color, and the third coating layer was formed after forming the third coating layer And a step of forming a first coating layer over the entire region of the first color-painted region including the region.

  As described above, according to the present invention, when a predetermined surface to be coated is applied in multiple colors, the part of the first color to be painted with the second color has a more concealing power than the first color. A high-color third coating layer was formed, and then the first coating layer was formed on the third coating layer. In this way, by forming a coating layer having a higher hiding power than the first color under the first coating layer, the second color coating having a relatively low brightness as described above can be used. Even when the film layer is formed to protrude into the first color coating scheduled region, the second color can be effectively concealed by the third coating layer. Therefore, the color developability of the first color that is finally overcoated on the third coating layer can be ensured. In addition, by forming a paint film layer having a higher brightness than the second color, it is possible to avoid as much as possible the situation of inhibiting the color developability of the first color overcoated thereon, This also can ensure the color developability of the first color. In addition, since the color of the third coating layer is different from the first color to be finally overcoated, by forming a coating layer of this color under the first coating layer, Therefore, it is possible to increase the concealing power of the first coating layer in the parting part without overlapping the first color having a low concealing power. Therefore, it is not necessary to form the first coating layer thicker than necessary. A color with a relatively low hiding power tends to have a large change in color developability depending on the coating film thickness. Therefore, in order to secure the hiding power, when a coating layer having a color with a low hiding power is formed larger than a predetermined thickness by applying twice or the like, there is a high possibility that a desired color developability cannot be obtained. . On the other hand, as in the present invention, it is a color that has better hiding power than the first color and does not hinder the color development of the first color, and has a different color from the first color. By coating the film, excellent hiding power can be imparted without increasing the coating thickness of the first color. Accordingly, the original color developability can be obtained by keeping the coating thickness of the first color below a predetermined size.

  Of course, according to the above-described method, the surface to be coated is in a state where the first color and the second color are separately applied when the second color is applied. At this time, by painting the entire area of the second coating scheduled area, which is the area where the second color is to be painted, with the second color, this coating can be used as the finish coating of the second coating scheduled area. In addition, the first color can be overpainted in a state where the paint area of the second color that has been finished is masked, so that the boundary line between the first color and the second color (parting line) ), It is possible to accurately paint the surface to be painted along.

  As described above, according to the coating method of the present invention, it is possible to accurately paint two or more colors without being restricted by the color scheme, and to impart excellent color developability to any color. It becomes possible to do.

It is a flowchart which shows the flow of the top-coat process among the coating methods which concern on one Embodiment of this invention. It is a schematic side view of the automobile body to be painted, and is a diagram showing a specific example of a painting mode when performing two-tone coating. It is principal part sectional drawing which shows the process of forming a 1st and 2nd intermediate coating film layer on an undercoat coating film layer. It is principal part sectional drawing which shows the process of forming a 1st top coat film layer on a 1st intermediate coat film layer. It is the (a) schematic side view of the body for motor vehicles at the time of forming the 1st top coat film layer shown in FIG. 4, (b) The A section enlarged view. It is principal part sectional drawing which shows the process of forming a 2nd top coat film layer on a 2nd intermediate coat film layer. It is the (a) schematic side view of the body for motor vehicles at the time of forming the 2nd top coat film layer shown in FIG. 5, (b) The B section enlarged view. It is principal part sectional drawing which shows the process of forming the 1st clear coating film layer on the 1st top coating film layer and the 2nd top coating film layer. It is principal part sectional drawing which shows the process of masking a 2nd top coat film layer with a masking tape. It is the (a) schematic side view of the body for motor vehicles at the time of masking a 2nd top coat film layer with the masking tape shown in FIG. 9, (b) The C section enlarged view. It is principal part sectional drawing which shows the process of forming a 3rd top coat film layer in the parting part with a 2nd color among the 1st painting plan areas. It is principal part sectional drawing which shows the process of duplicating and forming a 1st topcoat film layer on a 1st topcoat film layer. It is the (a) schematic side view of the body for motor vehicles at the time of forming the 1st top coat film layer of the surface layer side, (b) The D section enlarged view. It is principal part sectional drawing which shows the process of forming the 2nd clear coating film layer on the 1st top coat film layer and 2nd top coat film layer by the surface layer side.

  Hereinafter, the content of the coating method which concerns on one Embodiment of this invention is demonstrated based on drawing. In the present embodiment, the contents will be described below by taking as an example the case where two-tone coating is applied to the outer surface of an automobile body.

  The coating method according to an embodiment of the present invention includes an undercoating step, an intermediate coating step, and an overcoating step. Among these, the overcoating step is (S1) of the coated surface as shown in FIG. A step of forming a first top coat layer as a first coat layer having the first color in a first color paint plan area; and (S2) a plan to paint a second color of the coated surface A step of forming a second top coat layer as a second coat layer having the second color over the entire region, and (S3) of the first top coat layer and the second top coat layer on the deep layer side A step of forming a clear coating layer thereon and baking, (S4) a step of masking the second topcoat coating layer with a masking tape, and (S5) a second of the planned coating areas of the first color. Forming a third top coat layer having a third color on the parting portion with the color; and (S6) third top coat A step of forming a first topcoat coating layer over the entire area of the first color coating planned region including the region where the film layer is formed, and (S7) a clear coating layer on the first topcoat coating layer on the surface layer side And baking (S8), and a step of removing the masking tape from the second top coat layer.

  Further, in this embodiment, the object to be two-tone painted (the object to be coated) is an undercoated automobile body 1 as shown in FIG. 2, and the lower part of the outer surface of the automobile body 1 is the first part. The first coating scheduled area 1a to be painted with a color is used, and the upper part is a second coating scheduled area 1b to be painted with a second color. Here, it is assumed that the brightness of the first color is higher than the brightness of the second color, and the hiding power of the first color is lower than the hiding power of the second color. As a specific example, the first color is a yellow color such as yellow, and the second color is a black color such as black. Moreover, the area (painting area) of the 1st painting plan area | region 1a is larger than the area (painting area) of the 2nd painting plan area | region 1b. Hereinafter, details of each process will be described.

  First, in the undercoating process, an undercoating layer 2 (see FIG. 3 to be described later) is formed by applying the undercoating to the entire surface of the automobile body 1 (FIG. 2) to be coated, and the undercoating is performed by baking. The coating layer 2 is fixed to the automobile body 1. For the formation of the undercoat coating film layer 2, a known method such as electrodeposition coating can be employed.

  Subsequently, intermediate coating film layers 3 and 4 are formed by applying an intermediate coating to the surface of the undercoat coating film layer 2. In the present embodiment, as shown in FIG. 2, the first intermediate coating film is applied by applying an intermediate coating corresponding to the first color to the first coating scheduled area 1 a of the undercoated automobile body 1. Layer 3 is formed (FIG. 3). Moreover, the 2nd intermediate coating film layer 4 is formed by apply | coating the intermediate coating material corresponding to a 2nd color to the 2nd scheduled painting area | region 1b of the vehicle body 1 which gave the undercoat. After the two intermediate coating layers 3 and 4 are separately applied in this way, the intermediate coating layers 3 and 4 are fixed to the surface of the undercoat coating layer 2 by baking. At this time, the thickness of the first intermediate coating film layer 3 and the thickness of the second intermediate coating film layer 4 are adjusted to the same level by, for example, control of a coating robot described later. Depending on the balance with the subsequent process, heat drying may be performed instead of baking.

  Moreover, the intermediate coating process mentioned above can also be performed in a predetermined intermediate coating booth, and in that case, for example, illustration is omitted, but the following facilities and coating modes can be adopted. Specifically, a pair or a plurality of pairs of painting robots are arranged at positions facing each other across the conveyance line of the automobile body 1 that is an object to be coated in the intermediate coating booth. For example, in a pair of painting robots (upstream painting robots) arranged on the upstream side of the transfer line, the lower part of the outer surface of the automobile body 1, that is, the color corresponding to the first color in the first painting scheduled area 1a. The first intermediate coating layer 3 is formed by applying the intermediate coating with a spray or the like. Next, a pair of painting robots (downstream painting robots) located downstream from the upstream painting robot correspond to the second color in the upper part of the outer surface of the automobile body 1, that is, the second painting scheduled area 1b. The second intermediate coating layer 4 is formed by applying a color intermediate coating by spraying or the like. At this time, any intermediate coating operation is performed without masking. In addition, the surface (side surface of the fender, the door) facing the side of the vehicle body 1 in the first painting planned area 1a and the surface facing the upper side (the upper surface of the hood) are separated by separate upstream painting robots. You may paint and it may paint only with a pair of upstream painting robots. After the intermediate coating is applied as described above, for example, in the adjacent downstream baking booth (for intermediate coating), the automobile body 1 subjected to the intermediate coating is baked, and each intermediate coating layer 3 , 4 are fixed to the undercoat film layer 2.

(S1) Step of forming the first top coat film layer on the deep layer side After the undercoat and the intermediate coat are applied to the outer surface of the automobile body 1 in this manner, the first intermediate coat film layer as the surface to be coated is applied. A first top coat layer 5 having a first color which is one of two-tone is formed on the surface 3 (FIG. 4). In other words, the first top coat film layer 5 is formed in the first paint scheduled area 1a by applying the first color top coat to the first paint planned area 1a of the automobile body 1 (FIG. 5A). ). This overcoating is performed without masking the second coating scheduled area 1b. The thickness of the first top coat layer 5 is smaller than the thickness of the first top coat layer 12 (see FIG. 12) formed in step S6 described later. Moreover, in this embodiment, as shown in FIG.5 (b), the upper end part 5a of the 1st top coat film layer 5 is rather than the parting line 6 which is a boundary line of a 1st color and a 2nd color. The top coat is applied so as to be at a position slightly shifted to the first coating scheduled area 1a side.

(S2) Step of forming second top coat film layer Next, the second top coat film layer 7 having the second color which is the other of the two-tone is formed on the surface of the second intermediate coat film layer 4 (FIG. 6). In other words, the second top coat film layer 7 is formed in the second coating scheduled region 1b by applying the second color top coating to the second coating scheduled region 1b of the automobile body 1 (FIG. 7A). ). At this time, it is preferable to apply the top coat so that the second top coat layer 7 having a predetermined thickness is formed at least over the entire area of the second coating scheduled area 1b. For this reason, this top coating is performed without masking the first coating scheduled area 1a. Thereby, the said coating can be used as the top coat finish coating of a 2nd color. In the present embodiment, as shown in FIG. 7B, the second top coat film layer 7 is placed closer to the first coating scheduled region 1 a side than the parting line 6 by the amount of displacement of the first top coat film layer 5. By forming so as to protrude a little, the second color is painted without omission over the entire second coating scheduled region 1b.

  Here, the above-described overcoating step can be performed in a predetermined topcoating booth. In this case, for example, illustration is omitted, but the following equipment and coating modes can be adopted. Specifically, a pair or a plurality of pairs of coating robots are arranged at positions facing each other across the conveyance line of the automobile body 1 in the top coating booth. For example, a pair of painting robots (upstream painting robots) disposed on the upstream side of the transfer line are used to apply the first color top coating to the first painting scheduled area 1a of the automobile body 1 by spraying or the like. Then, the first top coat film layer 5 is formed. Next, with a pair of painting robots (downstream painting robots) positioned downstream from the upstream painting robot, the second color top coating is applied to the second painting scheduled area 1b of the automobile body 1 by spraying or the like. Thus, the second top coat layer 7 is formed. At this time, any overcoating operation is performed without masking. In addition, in this embodiment, the surface (fender, the outer surface of a door, etc.) which faced the side of the vehicle body 1 in the first coating scheduled region 1a and the surface (the upper surface of the hood, etc.) facing upward. By painting only with a pair of upstream painting robots, an increase in the number of painting robots in the top coat booth is avoided (only two pairs are available).

(S3) Formation of clear coating layer and baking step Next, a clear coating layer 8 is formed on the first top coating layer 5 and the second top coating layer 7 (FIG. 8). For example, the clear coating layer 8 is applied with a predetermined clear coating on the surfaces of the first top coating layer 5 and the second top coating layer 7 and then baked to perform both top coating layers 5 and 7. It settles on the surface. In addition, a well-known method can be applied to the formation method of the clear coating film layer 8, and it is possible to apply a well-known material also about a clear coating material. Further, the clear painting process and the baking process can be performed in a predetermined clear painting booth and a baking booth. In this case, for example, although not shown, the clear painting process and the baking process are arranged at predetermined positions in the clear painting booth. The clear coating layer 8 can be formed by applying a clear paint by spraying or the like with a pair of painting robots.

(S4) Masking step of the second topcoat layer After forming the clear layer 8 on the first topcoat layer 5 and the second topcoat layer 7 in this way, the second topcoat layer A masking tape 9 is affixed on 7 (FIG. 9). To be precise, as shown in FIGS. 10 (a) and 10 (b), by applying the masking tape 9 along the parting line 6 between the first coating planned area 1a and the second coating planned area 1b, Mask the entire area of the second coating scheduled area 1b. In this embodiment, the second top coat layer 7 is masked using only one masking tape 9, but a plurality of masking tapes such as parting tape (not shown) and masking tape 9 are used in combination. The second top coat layer 7 may be masked. The masking tape 9 is composed of, for example, masking paper and a tape that is integrally attached to the peripheral edge thereof.

(S5) Step of forming the third top coat layer After masking the second painted area 1b along the parting line 6, the part 10 with the second color in the first painted area 1a (FIG. 2). On top of (FIG. 10B), a third top coat layer 11 as a third coat layer having a third color is formed (FIG. 11). Here, as the color (third color) of the third top coat layer 11, a color having higher brightness than the second color and higher hiding power than the first color is adopted. In the present embodiment, a color having a lightness closer to the first color than the second color and having a higher hiding power than the first color is used. More specifically, the first color has the same lightness as the first color. A color with higher hiding power is used. At this time, the third top coat layer 11 is formed in the parting portion 10 (part on the first coating scheduled region 1a side from the parting line 6) with the second color in the first coating planned region 1a. What is necessary is just to form, and it is not necessary to form in the whole region of the 1st painting plan area | region 1a. Further, the thickness of the third top coat layer 11 should be large enough to conceal the color (second color) of the second top coat layer 7 formed partially overlapping thereunder. That's fine. Therefore, the thickness of the third top coat film layer 11 is set to be smaller than the thickness of the first top coat film layer 12 and the thickness of the second top coat film layer 7 that finally constitute the surface of the painted surface.

(S6) Step of forming the first top coat film layer on the surface layer side After forming the third top coat film layer 11 in this way, the third top coat film 7 is maintained in a state where the masking of the second top coat film layer 7 is maintained. A first topcoat coating film layer 12 is formed over the entire first coating scheduled area 1a including the formation area of the layer 11 (FIG. 12). In other words, by applying the first color overcoating on the clear coating layer 8 and the third top coating layer 11 formed on the first coating planned region 1a, the first coating planned region 1a is applied. The first top coat layer 12 is formed over the entire area (FIG. 13A). Thereby, the outer surface of the automobile body 1 is accurately divided into the first color and the second color with the parting line 6 as a boundary (FIG. 13B). In this case, the top coating film in the first coating scheduled area 1a is the third top coating film layer 11 and the first top coating film layer 5 on the deep layer side in the portion where the third top coating film layer 11 is interposed. And the first topcoat layer 12 on the surface layer side, and in the portion where the third topcoat layer 11 is not interposed, the first topcoat layer 5 on the deep layer side and the surface layer side The first top coat film layer 12 and the two-layer structure are formed. On the other hand, the top coating film in the second coating scheduled area 1 b is composed of only one layer of the second top coating film layer 7.

  Here, the second overcoating step described above can be performed in a predetermined topcoating booth in the same manner as the first overcoating step. In this case, for example, the following equipment and coating modes can be adopted. is there. Specifically, a pair or a plurality of pairs of painting robots are arranged at positions facing each other across the conveyance line of the automobile body 1 in a predetermined topcoat painting booth. Then, for example, a pair of painting robots arranged on the upstream side of the transfer line, the first color on the surface (fender, outer surface of the door, etc.) facing the side of the automobile body 1 in the first painting planned area 1a. The first color is applied to the surface (the upper surface of the hood, etc.) facing the upper side of the automobile body 1 in the first coating planned area 1a by a pair of coating robots disposed on the downstream side by applying the top coating paint by spraying or the like. Apply the top coat. Thus, the first color is accurately overcoated (forms the first top coat film layer 12 on the surface layer side) to the first painted area 1a of the automobile body 1 having a relatively large painted area. It becomes possible. Further, regarding the formation of the third top coat film layer 11 (third color coating), a coating robot may be arranged in the same manner as the first top coat film layer 12, but the coating area is small, for example. In view of the above, in the step of manually painting the inner surface of the automobile body 1, the third color may be applied simultaneously with the inner surface coating. As a result, the third color can be applied without adding a dedicated process.

(S7) Second Clear Coating Layer Formation Step and Baking Step Next, the clear coating layer 13 is formed on the first topcoat coating layer 12 on the surface layer side (FIG. 14). For example, the clear coating layer 13 on the surface layer side is baked after a predetermined clear paint is applied to the surface of the first top coating film layer 12 on the surface layer side, like the clear coating layer 8 on the deep layer side. Fix to the surface of the first topcoat layer 12. In the present embodiment, the second clear coating is performed with the masking tape 9 left. Thereby, in the state which removed the masking tape 9 by process S8 mentioned later, while the surface clear coating layer 13 is formed in the surface of the 1st top coat layer 12, the surface of the 2nd top coat layer 7 Only the clear coating layer 8 on the deep layer side is formed (FIG. 14).

  As a method for forming the clear coating layer 8 on the surface layer side, a known method can be applied as in the case of forming the clear coating layer 8 on the deep layer side. It is possible to apply. Further, the clear coating process and the baking process can be performed in a predetermined clear coating booth and a baking booth as in the first time.

  In addition, as described above, when all the steps from the intermediate coating process to the second baking process after the top coating are performed in a predetermined booth, for example, the intermediate coating booth → the baking booth (or the heating / drying booth) → the first topcoat coating booth (First time) → Second top coat booth → Clear paint booth (first time) → Baking booth (first time) → Third top coat booth → First top coat booth (second time) → Clear paint booth (second time) → It is possible to employ one in which each booth is arranged in the order of the baking booth (second time). Alternatively, as described above, when the first and second coating scheduled areas 1a and 1b are configured to be separately paintable by using two pairs of robots in the first overcoating booth, It is also possible to use the same painting booth as the first overcoating booth (it can be handled only by changing the paint). Furthermore, it is possible to use the same coating booth for the top coating booth and the intermediate coating booth.

(S8) Step of removing masking tape from second top coat film layer After forming the clear coat layer 13 on the surface layer side on the first top coat film layer 12 in this way, the masking tape 9 is peeled off. Remove from the top of the second top coat layer 7. Thereby, it will be in the state which the 2nd top coat film layer 7 (To be exact, the clear paint film layer 8 formed on the 2nd top coat film layer 7) was exposed. In this embodiment, the masking tape 9 is removed after the second clear coating, but if the adhesion between the clear coating layers 8 and 13 can be secured, for example, illustration is omitted. After the masking tape 9 is removed, the second clear coating may be performed.

  By passing through the above process, the vehicle body 1 in which predetermined areas on the outer surface (the first coating scheduled area 1a and the second coating scheduled area 1b) are coated in two-tone is completed.

  Thus, in the coating method according to the present invention, a coating layer (third top coating layer 11) having a higher hiding power than the first color is formed under the first top coating layer 12. Thus, as described above, when the second color coating layer (second top coating layer 7) having a relatively low brightness protrudes into the first color coating scheduled area 1a and is formed. Even if it exists, this second color can be effectively concealed by the third top coat layer 11. Therefore, the color developability of the first color that is finally overcoated on the third top coat film layer 11 can be ensured. In addition, by forming a paint film layer (third top coat film layer 11) having a higher brightness than the second color, it is possible to inhibit the color development of the first color overcoated thereon. This can be avoided as much as possible, and this also ensures the color developability of the first color. Moreover, since the color of the 3rd top coat film layer 11 turns into a color different from the 1st color finally overcoated, the paint film layer (3rd top coat film layer 11) of this color is applied to the 1st top coat. By forming under the coating layer 12, it is possible to increase the hiding power of the first top coat layer 12 in the parting portion 10 without overlapping the first color having a relatively low hiding power. . Therefore, even if the color (first color) of the first top coat layer 12 is poor in hiding power and the color developability tends to vary greatly depending on the film thickness, the first top coat is It is possible to obtain the original color developability of the first color while imparting excellent hiding power to the coating layer 12.

  In the present embodiment, a relatively light color is the first color, a relatively light color is the second color, and a relatively large paint area is the first color. The steps S1 to S8 are performed with a color having a relatively small coating area as the second color. Thus, by determining the coating procedure according to the color arrangement, not only can the color developability of each color be improved, but also the area to be masked can be made relatively small. Therefore, it is possible to improve the color separation quality and color developability without much effort, and even if a large product such as an automobile body 1 is an object to be coated, it is possible to perform coating with excellent productivity and coating quality. It becomes possible to implement at low cost.

  As mentioned above, although one Embodiment of this invention was described, this invention can also take a structure other than the above in the range which does not deviate from the meaning.

  For example, in the above-described embodiment, a color having a higher brightness than the second color and a higher hiding power than the first color on the parting portion 10 with the second color in the first coating scheduled region 1a. Although the third top coat layer 11 is formed with a top coat, it is of course possible to use other paints. In other words, a paint for intermediate coating may be used as long as the paint has a higher brightness than the second color and a higher hiding power than the first color. Furthermore, any kind of paint can be used as long as there is no problem with the adhesion with the clear coating layer 8 on the deep layer side and the adhesion with the first top coating film layer 12 on the surface layer side. .

  In the above-described embodiment, the case where two-tone coating is applied to the outer surface of the automobile body 1 as an object to be coated is illustrated, but the present invention can also be applied to multi-color coating of three-tone or higher. For example, when applying three-color coating, the relatively lighter color between the two adjacent colors is the first color, and the lower lightness is the second color. Depending on the degree of hiding power of the overcoating layer of the applied color), the third color coating layer according to the present invention may be formed at the parting line with the adjacent second color. As a result, it is possible to obtain a three-color painted surface having excellent color developability for all three colors.

  Moreover, the method described above can be similarly applied not only to the automobile body 1 but also to the surface of other objects to be coated.

DESCRIPTION OF SYMBOLS 1 Automobile body 1a First coating scheduled area 1b Second coating scheduled area 2 Undercoat coating layer 3 First intermediate coating layer 4 Second intermediate coating layer 5 First top coating layer (deep layer side)
5a Upper end part 6 Parting line 7 Second top coat layer 8 Clear coat layer (deep layer side)
9 Masking tape 10 Parting portion 11 Third topcoat layer 12 First topcoat layer (surface layer side)
13 Clear coating layer (surface layer side)

Claims (1)

A method for applying a first color and a second color different from the first color on a surface to be coated,
A step of forming a first coating layer having the first color in a region to be coated of the first color in the surface to be coated;
After forming the first coating layer, forming a second coating layer having the second color over the entire area to be painted of the second color in the surface to be coated;
In a state where the second coating layer is masked, the lightness higher than the second color and the first color at the parting portion with the second color in the first color coating scheduled region. Forming a third coating layer having a color with higher hiding power than,
Forming the first coating layer over the entire area of the first color coating scheduled region including the region where the third coating layer is formed after forming the third coating layer. Painting method.

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