JPH0724407A - Coating method for car body - Google Patents

Abstract

PURPOSE:To prevent soaring up of coating film admixtures at the time of finish coating by covering the coating film admixtures remaining on the floor surface of a car body after deposition of the coating film admixtures by a vibration damping sheet material placed and fixed on the floor surface of the car body. CONSTITUTION:This coating method for the car body has a binder applying stage for applying a binder onto the outside surface of the car body 11, a coating film admixture depositing stage for depositing the coating film admixtures 4, 4... on the binder layer obtd. in this binder applying stage and a clear coating stage for applying clear coating on the coating film admixture depositing layer obtd. in this coating film admixture depositing stage. A vibration damping sheet material sticking stage I for placing and fixing the vibration damping sheet material 14 onto the coating film admixtures 4, 4... made to remain by falling on the floor surface 13 of the car body 11 in the coating film admixture depositing stage is interposed between the coating film admixture depositing stage and the clear coating stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating an automobile body used for forming a coating film containing a coating material such as retroreflective beads on the surface of an automobile body.

[0002]

2. Description of the Related Art Conventionally, a high-brightness reflective coating film using retro-reflected light is well known and is used, for example, for traffic signs and safety signs. As the high-brightness reflective coating film, as shown in FIG. 6, a base layer 2 serving as a colored reflective layer formed on a predetermined substrate 1 (which has been subjected to electrodeposition coating and intermediate coating), and the base And a clear layer 5 containing a coating material (for example, glass beads) for retroreflection 4, 4, ..., which is uniformly and densely arranged on the surface side of the layer 2 through a binder layer 3 having an adhesive action. A structure provided is well known (for example, JP-A-63-22917).
(See Japanese Patent No. 6).

[0003]

The high-brightness reflective coating film having the above-described structure has a high-brightness (in other words, a high-brightness reflective film I due to the presence of the retroreflected light I retroreflected by the glass beads 4, 4 ... Since such transparency, brilliance, and depth are exhibited, it can be considered to use it as a coating film for automobile outer panels. Reference numeral I ₀ is incident light.

The coating film having the above-mentioned constitution is obtained by applying the binder layer 3 on the base layer 2, then uniformly and densely applying the glass beads 4, 4, ... And then applying the clear layer 5 thereon. It is supposed to be completed, and the distance between the glass beads 4, 4, ... And the base layer 2 must be constant (in other words, the glass beads 4, 4 ,.

By the way, when the glass beads 4, 4, ... (Diameter: 20 to 100 μm), which is a coating material, are to be coated on the binder layer 3 in a line, as shown in FIG. Multiple glass beads 4,4 ... on layer 3
After spraying, the glass beads 4, 4 ··· (that is, the glass beads 4, 4 · · in the second row or more) other than those applied to the binder layer 3 are blown off. . This blown off excess glass beads 4,4
..Falls outside the vehicle, but inside the vehicle (for example,
On the floor).

Of these dropped glass beads 4, 4, ..., those that have fallen outside the vehicle body are easy to collect, so there is no problem, but those that fall inside the vehicle body (for example, on the floor surface) are difficult to collect. Therefore, even if it is tried to remove it by air blow or the like, a large amount remains. If the glass beads 4, 4, ... Remain on the floor surface of the vehicle body as described above, the glass beads fly up in the next step, which is clear coating of the top surface of the vehicle body, and the glass beads 4, 4, ... There may be a problem that

The present invention has been made in view of the above points, and is a vibration damping sheet in which the coating film mixed material remaining on the vehicle body floor surface after the coating film mixed material is applied is placed and fixed on the vehicle body floor surface. By covering with a material, the purpose is to prevent rising of the material mixed with the coating film at the time of top coating.

[0008]

According to a first aspect of the present invention, as means for solving the above-mentioned problems, a binder coating step of coating a binder on the outer surface of an automobile body and a binder coating step Coating coating material coating step of coating the coating material mixture coating material on the binder layer, and clear coating for performing clear coating to the coating film coating material coating layer obtained in the coating coating material coating step In a method for coating an automobile body including a step, a coating film dropped and left on the floor surface of the vehicle body in the coating material mixture coating step between the coating material mixture coating step and the clear coating step. The step of attaching the damping sheet material, in which the damping sheet material is placed and fixed on the mixed material, is interposed.

According to a second aspect of the present invention, as a means for solving the above-mentioned problems, in the method for coating an automobile body according to the first aspect, the damping sheet material has a heat fusion property, and The damping sheet material attaching step includes a heat treatment step of simultaneously baking and drying the binder layer and heat-sealing the damping sheet material by heating the vehicle body.

In a third aspect of the present invention, as means for solving the above-mentioned problems, in the method for coating an automobile body according to the first or second aspect, a predetermined portion of the vehicle body is applied to a predetermined portion of the vehicle body after the coating film mixture material applying step. On the other hand, an air blow is applied so that the surplus coating film mixed material is positively dropped and collected on the floor surface of the vehicle body.

[0011]

According to the first aspect of the invention, the following actions can be obtained by the above means.

That is, in the coating film mixed material coating step, the excess coating film mixed material not coated on the binder layer is left on the floor surface of the vehicle body. By mounting and fixing the vibration-damping sheet material, it is possible to prevent the above-mentioned residual coating film-containing material from rising in the clear coating process, which is a post-process, and to apply it between the vibration-damping sheet material and the vehicle body floor surface. Due to the inclusion of the film-mixed material, a shear deformation occurs at the boundary surface during floor vibration.

According to the invention of claim 2, the following effects can be obtained by the above means.

That is, the damping sheet material is heat-fused to the floor surface of the vehicle body at the same time as the binder layer is baked and dried, and the process is simplified, and at the same time, the coating material mixed in the peripheral portion of the damping sheet material is retained. Can be done reliably.

According to the third aspect of the invention, the following effects can be obtained by the above means.

That is, after applying the coating film-mixed material, air blow is applied to a predetermined portion of the vehicle body to positively collect the excessive coating film-mixed material on the floor surface of the vehicle body, and the damping sheet material is mounted thereon. By placing and fixing (or heat-sealing), it is possible to prevent the excess coating film mixed material from remaining on parts other than the vehicle body floor surface as much as possible, so that the coating film mixed material rises up in the later clear coating process. It will be prevented more reliably.

[0017]

According to the first aspect of the present invention, a binder coating step of coating a binder on the outer surface of a vehicle body of an automobile, and a coating film mixture material is coated on the binder layer obtained in the binder coating step. A coating film mixture material applying step,
A coating method for an automobile body, which comprises a clear coating step of performing clear coating on the coating layer containing coating material coating layer obtained in the coating layer containing coating material coating layer Between the painting process and the painting process mixing material application process, there is a damping sheet material pasting process in which the damping sheet material is placed and fixed on the coating film mixing material left on the floor surface of the vehicle body and left behind. As a result, the surplus coating film mixture material that was not applied to the binder layer in the coating film mixture material application process was wrapped up by the damping sheet material that was placed and fixed from above, so that the subsequent process It is possible to effectively prevent the rise of the residual coating film mixed material in the clear coating process, which is excellent in that it is possible to prevent the occurrence of coating film defects due to the mixing of the coating film mixed material into the clear coating film. effective Further, as a result, since the coating film mixed material is interposed between the vibration damping sheet material and the vehicle body floor surface, a slip deformation occurs at the boundary surface during floor vibration, and the damping effect can be improved. There is also an effect that you can.

According to the second aspect of the invention, in the method for coating an automobile body according to the first aspect, the damping sheet material is made to have a heat fusion property, and the damping sheet material attaching step is performed on the vehicle body. Since it includes a heat treatment step of simultaneously baking and drying the binder layer and heat-sealing the vibration damping sheet material by heating, the process is simplified and it is located at the peripheral portion of the vibration damping sheet material. Since it is possible to reliably hold the coating film-containing material, there is an excellent effect that the rising of the residual coating film-containing material can be more effectively prevented in the clear coating step which is a subsequent step.

According to the third aspect of the present invention, in the method for coating an automobile body according to the first or second aspect, after the step of applying the coating film mixture material, air blow is applied to a predetermined portion of the vehicle body, and an excess coating film is applied. Since the mixed material is actively dropped and collected on the vehicle body floor surface, it is possible to prevent the residual coating material mixed material from remaining on the surface other than the vehicle body floor surface as much as possible. It is possible to more reliably prevent the coating material mixed in from flying up, and it is possible to more reliably prevent the occurrence of coating film defects in the clear coating film.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for coating an automobile body according to an embodiment of the present invention will be specifically described below with reference to the drawings.

Embodiment 1 FIG. 1 shows the sequence of steps in a method for coating an automobile body according to Embodiment 1 of the present invention. In this example,
This corresponds to the invention of claims 1 to 3.

The method of coating an automobile body of this embodiment is applied to form a high-brightness reflective coating film using retro-reflected light on an automobile body. As shown in FIG. Electrodeposition coating process A with paint, 160 ° C x 3
0 minutes electrodeposition baking step B, intermediate coating step C with polyester melamine paint, 140 ° C x 30 minutes intermediate coating baking step D, base layer application step E with acrylic melamine paint,
Binder application process F using acrylic urethane paint, coating film mixture material coating process G for coating glass beads as coating film mixture material, air blow process H for air blow to a predetermined part of the vehicle body, control on the floor surface of the vehicle body The vibration damping sheet material is applied by a damping sheet material applying step I, a clear coating step J using an acrylic melamine paint, and a clear baking step K at 140 ° C. for 30 minutes. The base layer coating step E
A leaving time of 5 minutes is allowed between the binder application step F and the binder application step F and between the binder coating step F and the coating film mixture material application step G.

The steps A to G and J, K except the air blowing step H and the damping sheet material attaching step I are performed on the outer plate 12 (see FIG. 2) of the vehicle body 11.

The above-mentioned electrodeposition coating step A to binder coating step F are carried out by the same method as that usually carried out on the outer panel of an automobile body.

In the coating film mixture material applying step G, as shown in FIG. 7, a large number of coating film mixture materials are formed on the binder layer 3.
(In the case of the present embodiment, the glass beads 4, 4 ... Other than those coated on the binder layer 3 after spraying the glass beads 4, 4 .. 4.
The glass beads 4, 4 ... Are applied in a single row by the method of blowing off. Therefore, after the coating film mixed material coating step G is completed, as shown in FIG. 2, the surplus glass beads 4, 4, ... Are dropped and left on the floor surface 13 of the vehicle body 11. . At this time, some glass beads 4, 4, ... May be left on the bag portion, the clearance, etc. of the vehicle body 11.

Therefore, in the air blowing step H, the bag portion of the vehicle body 11, the clearance, etc. are mainly air blown, and the glass beads 4, 4 ... It is supposed to be actively set to fall. That is, in the case of the present embodiment, almost no surplus glass beads exist other than the glass beads 4, 4, ... Left on the vehicle body floor surface 13. The air blowing step H may be omitted if there are few glass beads left on the floor surface 13 and other areas.

In the step I of attaching the damping sheet material,
A heat-fusible asphalt sheet to which pitch is added is used as the vibration damping sheet material 14, which is attached to the vehicle body floor surface 13 from above the surplus glass beads 4, 4. At this time, by heating the vehicle body 11, baking and drying of the binder layer 3 and thermal fusion of the vibration damping sheet material 14 are simultaneously performed. That is, in the case of this embodiment, the baking and drying of the binder layer 3 and the heat fusion of the vibration damping sheet material 14 are performed in the same step. As shown in FIG. 3, the floor surface 13 on which the damping sheet material 14 is heat-sealed in this manner is
Glass beads 4, 4 ... between the 3 and the damping sheet material 14
Will be wrapped. Therefore, even if clear coating is performed in the coating booth while flowing air from the upper side to the lower side in the clear coating step J which is a post-process, the glass beads 4, 4, ... It is securely held between 13 and 13 so that it will not soar.

The clear coating step J and the clear baking step K are carried out in the same manner as that usually performed on the outer skin of an automobile body.

By applying the coating method as described above, the surplus glass beads 4, 4, ... Not coated on the binder layer 3 in the coating film mixture material coating step G are heat-fused from above. Thus, the remaining glass beads 4, 4, ... Are effectively prevented from rising in the clear coating process J which is a post process. Therefore, the occurrence of coating film defects due to the mixing of the glass beads 4, 4, ... into the clear coating film can be prevented.

Further, as a result, the glass beads 4, 4, ... Are interposed between the damping sheet material 14 and the vehicle body floor surface 13, so that a slip deformation occurs at the boundary surface during the vibration of the floor, resulting in damping. The effect can also be improved.

Moreover, in the vibration damping sheet material attaching step I, the baking and drying of the binder layer 3 and the heat fusion of the vibration damping sheet material 14 are simultaneously performed by heating the vehicle body, so that the process is simplified. At the same time, the glass beads 4, 4, ... Located on the peripheral edge of the vibration damping sheet material 14 can be reliably held, and the remaining glass beads 4, 4 ,. Will be prevented even more effectively.

Further, as in this embodiment, after the coating film mixture material applying step G, air blow is applied to a predetermined portion of the vehicle body 11 (for example, a bag portion, a clearance or the like), and excess glass beads 4, 4 are added. .. are actively dropped and collected on the vehicle body floor surface 13, so that the surplus glass beads 4, 4 ... Other than the vehicle body floor surface 13 are prevented from remaining as much as possible, which is a post process. The soaring of the glass beads 4, 4, ... In the clear coating process J can be more reliably prevented.

Embodiment 2 FIG. 4 shows the sequence of steps in a coating method for an automobile body according to Embodiment 2 of the present invention. In this example,
This corresponds to the invention of claims 1 to 3.

In the case of the present embodiment, another damping sheet material attaching step I'is provided between the intermediate coating step C and the intermediate coating baking step D in Example 1. In the vibration damping sheet material attaching step I ′, the vibration damping sheet material 14 ′ having a thickness half that of the vibration damping sheet material normally attached to the floor surface 13 is used.
(See Figure 5) will be attached. Further, in the damping sheet material attaching step I ′, the heat-sealing of the attached damping sheet material 14 ′ is simultaneously performed in the intermediate coating and baking step D. In the case of the present embodiment, the floor surface 13 is applied in the damping sheet material attaching step I after the air blowing step H.
It goes without saying that the vibration-damping sheet material 14 attached to the sheet is also half the thickness of the sheet to be attached normally.

In the case of the above, as shown in FIG. 5, the damping sheet material 14 'heat-sealed on the floor surface 13'.
The glass beads 4, 4, ... Are wrapped between the and the vibration damping sheet material 14. In this case, the glass beads 4,
.. are interposed between the vibration damping sheet materials 14 and 14 ', so that the shear deformation occurring at the boundary surface during floor vibration becomes large, so that the damping effect is further improved. Other functions and effects are the same as in the case of the first embodiment, and the description thereof will be omitted to avoid duplication.

In each of the above-mentioned embodiments, the case where the glass beads are used as the coating material is explained, but the present invention can be applied to the case where a material other than the glass beads is used as the coating material. Is.

[Brief description of drawings]

FIG. 1 is a process sequence diagram in a method for coating an automobile body according to a first embodiment of the present invention.

FIG. 2 is a schematic view of the vehicle body showing a state before the damping sheet material is attached in the method for coating a vehicle body according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a floor surface structure after the damping sheet material is attached in the method for coating an automobile body according to the first embodiment of the present invention.

FIG. 4 is a process sequence diagram in a method for coating an automobile body according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a floor surface structure after a damping sheet material is attached in a method for coating an automobile body according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a general retroreflective coating film.

FIG. 7 is a cross-sectional view showing a state during coating in a general glass bead coating method.

[Explanation of symbols]

2 is a base layer, 3 is a binder layer, 4 is a coating material (glass beads), 5 is a clear layer, 11 is a vehicle body, 12 is a vehicle exterior plate, 13 is a floor surface, and 14 and 14 'are damping sheet materials. ,
F is a binder coating process, G is a coating film mixture material coating process, H
Is the air blow process, I and I'is the damping sheet material attaching process,
J is clear coating process, K is clear baking process.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takakazu Yamane, No. 3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) No. 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Stock In-house (72) Inventor Yufumi Taniguchi 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd.

Claims (3)

[Claims] 1. A binder coating step of coating a binder on an outer surface of an automobile body, and a coating layer mixing material coating step of coating a coating layer mixing material on the binder layer obtained in the binder coating step. A coating method for an automobile body, comprising: a clear coating step of performing clear coating on the coating layer containing material coating layer obtained in the coating layer containing material coating layer, Between the process and the clear coating process, the damping sheet material that mounts and fixes the damping sheet material on the coating material that has been left on the floor surface of the vehicle body in the coating material mixing process A method of coating an automobile body, characterized in that an attaching step is interposed. 2. The damping sheet material has heat-sealing properties, and in the step of attaching the damping sheet material, the vehicle body is heated to bake and dry the binder layer and heat-sealing the damping sheet material. The method for coating an automobile body according to claim 1, further comprising a heat treatment step of simultaneously performing and. 3. After the step of applying the coating film-mixed material, an air blow is applied to a predetermined portion of the vehicle body so that the excess coating film-mixed material is positively dropped and collected on the floor surface of the vehicle body. The coating method for an automobile body according to claim 1 or 2.