JPH0623316A - Painting method - Google Patents

Abstract

PURPOSE:To ensure that the film thickness of a binder is made uniform and at the same time, beads are applied efficiently and evenly within a specified time after application of the binder when the beads are applied in a well-aligned manner, as well as an operation is performed efficiently. CONSTITUTION:At least, beads 7 of glass or resin on one side are aligned as a coat after applying a binder 6 on the surface of a material 1 to be coated. Next, the material 1 is moved relatively to a means 4 for applying a binder and a means 5 for applying beads, being allowed to rotate around an almost horizontal axial center. Further, the beads are applied to the material 1 backward of a binder application position in the single round of rotation or moving direction of the material 1, and at a position where the coat of the binder 6 reaches a constant value. Thus the beads 7 are allowed to stick to the binder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating technique for coating a surface of an object to be coated with a retroreflective material made of at least one of glass and resin beads, and particularly to a coating technique such as a car body of an automobile. The present invention relates to a coating method suitable for a shaped object to be coated.

[0002]

2. Description of the Related Art In recent years, a coating technique has been known in which a retroreflective material made of transparent minute beads made of glass or resin is laid and coated on the surface of a relatively small object such as a helmet or a traffic sign.

According to this coating, the optical effect that the light incident on the retroreflective material is emitted as the reflected light in the same direction, that is, the recursiveness of the light is utilized, whereby various kinds of condensing light and disturbance light are generated. It can be seen in the form of, and a gem-like coating effect with high brightness and excellent color tone can be obtained. In other words, the paint itself shines brightly, which can have a strong impact on the viewer.

In such coating, generally, a surface of an article to be coated is coated with an undercoat (intermediate coating), and then a reflective layer is formed thereon,
Further, beads, which are a retroreflective material, are laid over it via a binder layer (adhesive layer), and a transparent clear layer is formed on the outermost layer to complete the process.

[0005]

By the way, in such coating, the retroreflective material is uniformly applied, but large equipment is required for a large object to be coated such as an automobile body. It is difficult to paint. Further, the bead application is greatly affected by the correlation between the adhesiveness of the binder and the passage of time, and it becomes difficult to uniformly apply the binder when the object to be coated has a large size. Furthermore, the binder is liable to be partially dried, and as a result, the beads, which are the retroreflective material, cannot be adhered and spread evenly. , The color of the paint may become muddy and give a bad impression.

Further, the beads are generally adhered to the binder layer by using static electricity or the like, but the beads are likely to drop on the vertical surface (door) or corner (fender corner) of the vehicle body, It is difficult to form a uniform bead layer, and the applied coating has various problems such as low reliability with respect to weather resistance.

Further, normally, beads are bonded when the binder layer is in a semi-cured state, but it is troublesome to set the time from the formation of the binder layer to the bonding of the beads.

Conventionally, for example, Japanese Patent Laid-Open No. 63-229
As described in Japanese Patent Publication No. 176, the UV-curable coating is used as a binder layer, and various measures have been taken such as uniform application of a retroreflective material. There are still many problems regarding the above points in dealing with things.

The present invention has been made to solve such a problem, and an object thereof is to make the film thickness of the binder uniform and to make the beads efficient, reliable and uniform within a predetermined time after coating the binder. An object of the present invention is to provide a coating method which can be applied and can be efficiently worked.

[0010]

In order to achieve the above object, the present invention applies a binder to the surface of an object to be coated, and then lays out a retroreflective material made of at least one bead made of glass or resin. A coating method for coating, wherein the object to be coated is moved relative to a binder application means and a bead application means while rotating the object to be coated around a substantially horizontal axis, and a binder in a rotation or movement direction of the object to be coated. It is characterized in that beads are applied to the object to be coated behind the coating position and at a position where the coating film of the binder has a constant value, and a retroreflective material is attached onto the binder.

In the method of the present invention, it is desirable to set the relationship between the viscosity value of the binder and the film thickness value within a constant value range in which they are inversely proportional to each other.

The beads are preferably applied by electrostatic coating.

Further, it is desirable that the bead coating is performed from above the object to be coated onto a portion of the object to be coated which is substantially horizontal in accordance with the rotation.

[0014]

According to the present invention, the binder is applied while rotating the object to be coated around a substantially horizontal axis, so that the weight of the binder can be used for reliable coating and uniform film thickness and sagging prevention. Etc. can be effectively achieved.

Further, while the rotating object to be coated is moved relative to the binder applying means and the bead applying means, the coating film of the binder has a constant value behind the binder applying position in the rotating or moving direction of the object to be applied. Since the beads are applied to the object to be coated at the position where it will be applied, the beads can be applied within a predetermined short time after applying the binder to the object to be coated, improving efficiency and making the bead layer uniform. Can be achieved.

Particularly, by setting the relationship between the viscosity value of the binder and the film thickness value within a constant value range in which they are inversely proportional to each other, beads can be more reliably attached.

Further, when the beads are applied by the electrostatic coating method, the beads are spread more uniformly.

Further, if the beads are applied from above the object to be coated to a portion of the object to be coated which is substantially horizontal, the uniform coating can be performed without being affected by the weight of the beads. By the above method, it becomes possible to express a jewel-like texture which cannot be expressed by the conventional automotive paint.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, as shown in FIGS. 1 and 2, while rotating a vehicle body 1 of an automobile, which is an object to be coated, by a substantially horizontal shaft 2 of a carriage 2, the vehicle body 1 is moved in one direction (direction of arrow a in FIG. 1). To move. A coating gun 4 serving as a binder coating means and a powder gun 5 serving as a bead coating means are arranged at positions close to each other on the upper side of the movement of the vehicle body 1, and coating of the binder 6 and coating of the beads 7 are sequentially performed. To do.

In this case, for example, the binder 6 is acrylic or urethane paint and the beads 7 are glass beads. The beads 7 are applied by an electrostatic coating method behind the binder application position in the moving direction a of the vehicle body 1 and at a position where the coating film of the binder 6 has a constant value. Also, this bead coating is performed on a portion of the vehicle body 1 which becomes substantially horizontal by rotation.

Incidentally, in the above-mentioned previous stage, the reflection layer is formed in advance by intermediate coating and metal vapor deposition. Also,
After the above bead coating, a clear layer such as transparent or colored transparent is formed.

FIG. 3 shows a cross-sectional shape of the coating portion thus formed. That is, the intermediate coating layer 8, the reflective layer 9 (plating, vapor deposition, mirror finish, high-reflection coating, etc.), the binder layer (adhesive layer) 10, the bead layer 11, and the clear layer 12 (transparent) are sequentially formed on the surface of the vehicle body 1. Alternatively, a color clear layer (acrylic, urethane paint) is formed.

By the way, in this embodiment, as shown in FIG. 4, the viscosity (horizontal axis) and the film thickness (vertical axis) of the binder 6 are in a certain range in which they are in inverse proportion to each other. The beads 7 which are the retroreflective materials were uniformly dispersed and adhered to each other.

Hereinafter, this point will be described in detail. That is, in order to uniformly disperse and adhere the beads 7, the paint viscosity of the binder layer (adhesion layer) 10 and the coating conditions (film thickness, etc.) are greatly related, so the following experiment was conducted in this example. (1) The reflective layer 9 was an aluminum vapor deposition plate, and the vapor deposition surface thereof was plasma-treated to improve the wettability of the vapor deposition surface. (2) The adhesive coating material is applied under predetermined application conditions. (3) Immediately after 30 seconds from the application of the binder 6 as the adhesive coating, the beads 7 were sprayed using a powder electrostatic coating machine. (4) Finally, the clear layer 12 paint was applied. (5) After baking and drying, in order to inspect the dispersed state of the beads 7, four fields of view (magnification: × 50) were taken with a microscope. (6) The number of beads 7 was determined from the photograph. Squares of 20 × 20 mm were drawn at 4 locations per field of view, the number in each square was counted, and the average number and standard deviation were calculated. (7) Then, when it was confirmed whether it was within the range of the reference value, the average value was 58 or more and 65 or less. The standard deviation was 3.4 or less.

From the above, in order to adhere the beads 7 uniformly, it is necessary to form a thin adhesive layer having a low viscosity, and the beads 7 are applied within 30 seconds after the binder 6 is applied.
I found that I had to spray. That is, in order to uniformly disperse and bond the beads 7 as the retroreflective material, it is desirable to apply the adhesive coating within the range of the shaded area A shown in FIG. A retroreflective material must be applied inside.

Therefore, in the coating process of this embodiment, the following settings were made. (1) The coating gun 4 and the powder gun 5 were fixedly installed at the upper part of the coating booth. However, it was tilted up and down according to the shape of the vehicle body 1. (2) The space between the coating gun 4 and the powder gun 5 is the binder 6
The distance was set according to the characteristics of. That is, the binder 6
Since it is most stable to spray the beads 7 after 30 seconds have passed since the application, the distance between the coating gun 4 and the powder gun 5 was set in consideration of this and the trolley speed. (3) The rotation speed of the vehicle body 1 was set to a speed adapted to the application of the beads 7. That is, according to the tact of the line, they were arranged at intervals such that the time for bead spraying from the coating of the coating was within 30 seconds.

According to the present embodiment described above, the binder is applied while the vehicle body 1 is rotated about a substantially horizontal axis,
The weight of the binder 6 can be utilized for reliable coating, and the film thickness can be made uniform and sagging can be effectively prevented.

While the rotating car body 1 is moved relative to the coating gun 4 and the powder gun 5, the binder 6 is behind the binder application position in the moving direction of the car body 1.
Since the beads are applied to the vehicle body 1 at a position where the coating film has a constant value, the beads 7 can be applied within a predetermined short time after applying the binder, and the efficiency can be improved and the bead layer 11 can be evenly formed. Can be realized.

Particularly, by setting the relationship between the viscosity value of the binder 6 and the film thickness value within a fixed value range in which they are inversely proportional to each other, beads can be more reliably attached.

Further, since the beads are applied by the electrostatic coating method, the beads 7 are evenly spread. Furthermore, by applying the beads from above the vehicle body 1 to a portion that becomes a substantially horizontal plane due to the rotation, uniform application can be performed without being affected by the weight of the beads. By the above method, it becomes possible to express a jewel-like texture which cannot be expressed by the conventional automotive paint.

FIG. 5 shows another embodiment of the present invention.
The present embodiment is different from the above-mentioned one embodiment in that the binder coating means 4a and the bead coating means 5a are arranged at the same moving position of the vehicle body 1, behind the binder coating position B in the rotation direction of the vehicle body 1, and in the binder. This is the point at which beads are applied to the vehicle body 1 at the position C where the coating film has a constant value.

That is, in this embodiment, the first step (a)
Intermediate coating and reflective layer formation with, then the subsequent step (b)
The binder is applied to the side surface of the car body 1 and the car body 1
° Apply beads at the position after rotation. The bead coating means 4a used in this step is the automatic air switching unit 1
3 is used as the bead spraying device 14. Further, a recovery container 15 is provided to recover the beads 7, and the cleaning device 16 cleans the excess beads 7 for reuse.

Then, in the final step (C), the top coat finish for forming the clear layer 12 is performed.

According to this embodiment as well, the thickness of the binder 6 can be made uniform, and the beads 7 can be efficiently and surely and uniformly applied within a predetermined time after application of the binder in the same manner as in the previous embodiment, and the work can be performed efficiently. You can do it well.

[0035]

As described above, according to the present invention, it is possible to effectively achieve uniform film thickness, sagging prevention, etc. by rotating the object to be coated and applying the binder. Bead coating on the object to be coated at the position where the coating film of the binder is at a constant value behind the binder coating position in, beads can be coated within a short time,
The efficiency can be improved and the bead layer can be made uniform.

When the relationship between the viscosity value of the binder and the film thickness value is set within a fixed value range in which they are inversely proportional to each other, the beads can be more reliably attached and the beads can be electrostatically coated. If the method is used, the beads will be spread more evenly, and if the beads are applied from above the object to be applied to a part that is a substantially horizontal surface of the object due to rotation, it will not be affected by the weight of the beads. Excellent effects such as uniform coating can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view of the same embodiment.

FIG. 3 is a cross-sectional view of a coating portion formed by the same embodiment.

FIG. 4 is a diagram showing characteristics according to the example.

FIG. 5 is an explanatory diagram showing another embodiment of the present invention.

[Explanation of symbols]

1 coating object (vehicle body) 4,4a binder coating means 6 binder 5,5a bead coating means 7 beads (retroreflecting material)

Front page continued (72) Inventor Kazuo Hironaka 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (4)

[Claims] 1. A coating method in which a binder is applied to the surface of an object to be coated, and then a retroreflective material made of at least one of glass and resin beads is laid side by side, and the object to be coated is substantially horizontal. While rotating about a different axis, relative movement with respect to the binder coating means and the bead coating means, behind the binder coating position in the rotation or movement direction of the object to be coated, and the coating film of the binder has a constant value. A coating method, wherein beads are applied to the object to be coated at a certain position, and a retroreflective material is attached onto the binder. 2. The coating method according to claim 1, wherein the relationship between the viscosity value of the binder and the film thickness value is set within a fixed value range in which they are inversely proportional to each other. 3. The coating method according to claim 1, wherein the retroreflective material is applied by an electrostatic coating method. 4. The coating method according to any one of claims 1 to 3, wherein the retroreflective material is applied from above the object to be coated to a portion of the object to be substantially horizontal surface which is accompanied by the rotation. Coating method characterized by.