JPH06170322A - Coating method and device - Google Patents

Abstract

PURPOSE:To apply glass beads uniformly and densely in a single layer on a color reflection layer (more practically on a bonded layer) for coating. CONSTITUTION:In the coating method for coating uniformly recurrent reflection materials 4, 4... on a color reflection layer formed on a given material 1 to be coated through a bonded layer, the recurrent reflection materials 4, 4... are sprayed and applied for coating in the natural falling state from above to the face to be coated, while the face to be coated of the material 1 to be coated is retained almost horizontally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and an apparatus thereof, and more particularly to a coating method and an apparatus thereof used for forming a coating film containing a retroreflective material.

[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. For this high-brightness reflective coating,
As shown in FIG. 4, a colored reflective layer 2 formed on a predetermined substrate 1, and a retroreflective material 4 uniformly and densely arranged on the surface side of the colored reflective layer 2 with an adhesive layer 3 interposed therebetween. 4 ...
A structure having a clear layer 5 containing (for example, glass beads) is well known (see, for example, JP-A-63-229176).

[0003]

The high-brightness reflective coating film having the above-described structure has a high-brightness (in other words, a gemstone due to the presence of the retroreflected light I retroreflected by the retroreflective materials 4, 4 ... In order to exhibit such transparency, shine and depth as described above, attempts have been made in recent years to utilize it as a coating film for automobile outer panels. Reference numeral I ₀ is incident light.

In the coating film having the above-mentioned structure, after coating the adhesive layer 3 on the colored reflection layer 2, the glass beads 4, which are the retroreflection material,
4 ... Is uniformly and densely sprayed and coated, and then the clear layer 5 is formed by coating, and the glass beads 4, 4 ,. There is a problem in that it is technically extremely difficult to apply it to the.

The reason is that the specific gravity of the glass beads 4 (=
4.6) is much larger than the specific gravity (= 1.1 to 1.3) of ordinary powder coatings, and its particle size (= 50μm) is larger than that of powder coatings (= 20μm). Since it is large, it is not suitable for electrostatic coating, and it is considered that the particle velocity is too fast and repels from the object to be coated even by powder coating with high air pressure.

By the way, as shown in FIG. 6, glass beads 4 (diameter = 50 μm, specific gravity = 4.6) are used as a retroreflective material, and coating is performed by a powder coating machine at an air pressure of 3 kg / cm ² . When the angle θ of the object to be coated P with respect to the horizontal plane H and the angle φ with respect to the horizontal plane H of the powder gun G that sprays the glass beads 4, 4, ... Are used as parameters, the glass beads 4, 4, ... When the relationship between the distribution density A and the distribution density A (number / mm ² ) was examined, the results shown in FIG. 7 were obtained. Here, the solid line shows the case where the gun angle φ = 90 °, the dotted line shows the case where the gun angle φ = 45 °, and the one-dot chain line shows the gun angle φ
= 0 ° is shown. It is empirically known that the distribution density A of glass beads is in the range of 250 to 350 (number / mm ² ), in other words, the region between the dotted lines X ₁ and X _2. There is.

According to this, the gun angle φ = 90 °, 45
Glass bead distribution density A in both ° and 0 °
It turns out that cannot reach the optimum range. This seems to be due to the above reason.

Further, as shown in FIG. 8, the glass beads 4, 4, ... Are simply sprinkled on the article P using the cup C, and the distance L between the cup C and the article P is reduced. When the glass bead distribution density A was examined under the different conditions, the results shown in FIG. 9 were obtained. According to this, scattered glass beads 4,4
.. It can be seen that the glass beads 4,4 .. Therefore, the glass beads 4,
The coating density changes depending on the weight of 4 ..., and the glass beads 4, 4 ... may not be seen uniformly.

As described above, it is technically difficult to uniformly and densely spread and coat glass beads, which is a bottleneck in applying a high-intensity coating film using a retroreflective material to an automobile outer panel. Was there.

As in the above-mentioned publicly known example, various measures have been taken such as using an ultraviolet-curable coating material as an adhesive layer and applying a retroreflective material uniformly. There are still many problems in dealing with the object to be coated.

The present invention has been made in view of the above points, and an object thereof is to make it possible to uniformly and densely coat glass beads on a colored reflective layer (specifically, on an adhesive layer). It is what

[0012]

According to the method of claim 1, as a means for solving the above-mentioned problems, a retroreflective material is provided on a colored reflective layer formed on a predetermined article to be coated with an adhesive layer interposed therebetween. In a uniform coating method, while holding the surface to be coated of the object to be coated in a substantially horizontal state, the retroreflective material is spray-applied to the surface to be coated from above in a natural falling state. There is.

According to a second aspect of the present invention, as means for solving the above-mentioned problems, in the coating method according to the first aspect, the article to be coated is a three-dimensional object, and the coating is applied when the retroreflective material is coated. The object is rotated around a substantially horizontal rotation axis.

According to the third aspect of the present invention, as a means for solving the above-mentioned problems, the retroreflective material is sprinkled in a natural falling state on the adhesive layer on the colored reflective layer formed on a predetermined object to be coated. In a coating apparatus having a spray coating means for rotating, a rotating means for rotating the article to be coated around a substantially horizontal rotation axis, and the rotation axis so that the surface to be coated of the article to be coated is substantially horizontal. Tilt means for tilting is attached.

[0015]

According to the method of claim 1, the following actions can be obtained by the above means.

That is, while the coated surface is held in a substantially horizontal state, the retroreflective material is applied by spraying to the coated surface in a free fall state, so that the retroreflected light on the coated surface is reflected. The repulsion of the material does not occur, and the retroreflective material is uniformly and densely applied as a single layer on the surface to be coated.

By the way, glass beads as a retroreflective material
(Diameter = 50 μm, specific gravity = 4.6), when glass beads were spray-coated on the surface to be coated with a powder coating machine (air pressure = 0.5 kg / cm ₂ ), the angle θ ( The glass bead distribution density A (number / mm ² ) for (see FIG. 6) is as shown in FIG. Here, the distance between the coating gun and the object to be coated is 50
It was made cm. According to this, it is understood that the glass bead distribution density A is in the optimum range at the object angle θ≈0 °.

In the method of the second aspect, the following effects can be obtained by the above means.

That is, since the retroreflective material is applied by spraying while rotating the object to be coated about a substantially horizontal rotation axis, even if the object is a three-dimensional object, the direction of the retroreflective material is applied. The retroreflective material is sprayed on a surface substantially orthogonal to (i.e., a substantially horizontal surface). Therefore, it is possible to obtain a uniform and dense retroreflective material distribution in a single layer over the entire surface of the coated object made of a three-dimensional object.

In the device of the third aspect, the following actions can be obtained by the above means.

That is, while the object to be coated is rotated about the axis of rotation which is substantially horizontal by the rotating means, the posture is controlled by the tilt means so that the surface to be coated is substantially horizontal, and the surface to be coated is The retroreflector is always held in a state of being substantially orthogonal to the spraying direction. Therefore, it is possible to obtain a uniform and dense retroreflective material distribution in a single layer over the entire surface of the coated object made of a three-dimensional object.

[0022]

According to the method of the present invention, in a coating method for uniformly applying a retroreflective material on a colored reflective layer formed on a predetermined object to be coated with an adhesive layer, While the coated surface of the object is held in a substantially horizontal state, the retroreflective material is applied by spraying from above onto the coated surface in a natural falling state. It is possible to uniformly coat the retroreflective material as a single layer uniformly and densely on the surface to be coated.

According to a second aspect of the present invention, in the coating method according to the first aspect, the object to be coated is a three-dimensional object, and the object to be coated is centered on a substantially horizontal rotation axis when the retroreflective material is applied. Since it is rotated, even if the object to be coated is a three-dimensional object, the retroreflective material is sprayed in a natural falling state on a surface substantially orthogonal to the retroreflective material spraying direction (that is, a substantially horizontal surface). Therefore, there is an excellent effect that a uniform and dense retroreflector distribution can be efficiently obtained in a single layer over the entire surface of the coated object made of a three-dimensional object.

According to the apparatus of claim 3, the coating provided with the spray coating means for spraying the retroreflective material on the adhesive layer on the colored reflective layer formed on the predetermined object to be coated in the state of being naturally dropped. The apparatus is provided with rotating means for rotating the article to be coated around a substantially horizontal rotation axis, and tilt means for tilting the rotation axis so that the surface to be coated of the article to be coated is substantially horizontal. Then, the object to be coated is rotated about the axis of rotation which is substantially horizontal by the rotating means, and the posture is controlled by the tilt means so that the surface to be coated becomes substantially horizontal. It is maintained in a state that is almost orthogonal to the spraying direction (in other words, a substantially horizontal state), and a uniform and dense retroreflective material distribution is formed in a single layer over the entire surface of the coated object made of a three-dimensional object. It has an excellent effect of being efficiently obtained.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIG. 1 shows a coating apparatus according to Embodiment 1 of the present invention. The present embodiment corresponds to the inventions of claims 1 to 3.

The coating apparatus according to this embodiment, as shown in FIG. 1, is a trolley 1 for supporting a vehicle body 1 of an automobile, which is an object to be coated.
1, a coating gun 13 serving as a binder coating means for coating a binder 12 serving as an adhesive layer 3 (see FIG. 4) on the surface of the vehicle body 1 supported by the carriage 11, and a glass serving as a retroreflective material. .. and a powder gun 14 as a spray application means for spraying the beads 4, 4 ,.

On the surface of the vehicle body 1, a previously colored reflective layer 2 (see FIG. 4) is formed by painting.

The carriage 11 has an arrow Q on a horizontal floor surface F.
A pair of cylinders 15 and 16 are installed at the front and rear ends of the cylinder 15 and 16 which are expanded and contracted by fluid pressure acting as tilting means.

On the upper ends of the telescopic rods 15a and 16a of the cylinders 15 and 16, there are rotatably supported rotating shafts 17 and 18 which are the center of rotation of the vehicle body 1. The one (that is, the front side) rotary shaft 17 is supported on the upper end of the telescopic rod 15a of the front side cylinder 15 via a motor 19 as a rotating means for rotationally driving the rotary shaft 17.

A coating method using the coating apparatus having the above structure will be described below.

The vehicle body 1 is replaced by a substantially horizontal rotary shaft 1 of the carriage 11.
The coating gun 13 and the powder gun 14 sequentially apply the binder 12 and sprinkle the glass beads 4, 4, ... In a free-falling state while rotating them by 7, 18 and moving them in the direction of the arrow Q. At this time, by appropriately expanding and contracting the cylinders 15 and 16 which are tilting means, the coated surface facing the glass beads 4, 4, ... The attitude is controlled as follows. The glass guns 4 are sprayed by the powder gun 14 after the binder is applied by the coating gun 13. The glass beads are sprayed before the adhesive layer 3 formed by the binder application is dried. Since it is necessary, it is necessary to adjust the distance between the coating gun 13 and the powder gun 14 and the moving speed of the carriage 11.

When the application of the glass beads is completed as described above, the transparent or colored transparent clear layer 5 is formed on the glass beads 4, 4, ...

The coating film thus obtained is, as shown in FIG. 4, a colored reflection layer 2 formed on the vehicle body 1, an adhesive layer 3 formed on the colored reflection layer 2, and an adhesive layer 3 formed on the colored reflection layer 2. The adhesive layer 3 is provided with a clear layer 5 including glass beads 4, 4, ...

As described above, while the coated surface of the vehicle body 1 is held in a substantially horizontal state, the glass beads 4, 4 ... As a result, the glass beads 4, 4
· Repulsion does not occur easily, and the glass beads 4, 4 · · are uniformly and densely applied to the surface to be coated in a single layer.

Incidentally, glass beads (diameter = 50 μm, specific gravity = 4.6) were used, and a powder coating machine (air pressure = 0.5 kg /
cm ₂ ), glass beads 4, 4 ··· were spray-applied to the surface to be coated in a state of substantially free fall.
The glass bead distribution density A (number / mm ² ) for the reference (see) was as shown in FIG. Here, the distance between the coating gun and the object to be coated was 50 cm. According to this, the coated object angle θ ≒
It can be seen that the glass bead distribution density A is in the optimum range at 0 °.

Further, in the case of this embodiment, the glass body 4, 4, ... Is sprayed and coated in a state of being naturally dropped while rotating the vehicle body 1 about the substantially horizontal rotary shafts 17, 18. , Even if a three-dimensional object such as the vehicle body 1, the glass beads 4, 4, ... Are sprayed on a surface that is substantially orthogonal to the glass bead spraying direction (that is, a substantially horizontal surface). A uniform and dense glass bead distribution is obtained in a single layer over the entire surface of the vehicle body 1, which is the object.

Embodiment 2 FIG. 2 shows a coating apparatus according to Embodiment 2 of the present invention. The present embodiment corresponds to the inventions of claims 1 to 3.

In the case of this embodiment, the vehicle body 1 includes the rotary shaft 15,
It is movably supported by a guide rail 22 via lifting support devices 20 and 21 which support 16 and also act as tilting means. Other configurations, functions and effects are the same as those of the first embodiment, and the description will be omitted to avoid duplication.

Embodiment 3 FIG. 3 shows a coating apparatus according to Embodiment 3 of the present invention. The present embodiment corresponds to the inventions of claims 1 to 3.

In the case of this embodiment, the carriage 1 in the first embodiment
An inclined surface 23 that acts as a tilt means is formed on the floor surface F on which 1 moves. That is, the coated surface of the vehicle body 1 is held substantially horizontal by the inclination of the carriage 11. In the case of this embodiment, the rotary shaft 17,
18 is directly supported on the front and rear of the carriage 11. Other configurations, functions and effects are the same as those of the first embodiment, and the description will be omitted to avoid duplication.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a coating apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic side view showing a coating apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic side view showing a coating apparatus according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the structure of a general retroreflective coating film.

FIG. 5 is a characteristic diagram showing a relationship between an angle of an object to be coated and a distribution density of glass beads when the glass beads are spray-coated by natural dropping.

FIG. 6 is a schematic diagram showing a relationship between a gun and an object to be coated by powder coating.

FIG. 7 is a characteristic diagram showing a relationship between a coating object angle and glass bead distribution density in powder coating using air pressure.

FIG. 8 is a perspective view showing an aspect of simple glass bead spraying using a cup.

FIG. 9 is a characteristic diagram showing the relationship between the coating object angle and the glass bead distribution density in simple glass bead spraying using a cup.

[Explanation of Codes] 1 is an object to be coated (car body), 2 is a colored reflective layer, 3 is an adhesive layer, 4 is a retroreflective material (glass beads), 5 is a clear layer, 11 is a carriage, 12 is a binder, 13 is Coating gun, 14 powder gun, 15 and 16 tilting means (cylinder), 17 and 18 rotating shafts, 19 rotating means (motor), 20 and 21 tilting means (elevating support device), 22 guide rails 23 are tilting means (inclined surfaces).

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B05D 7/24 301 W 8720-4D

Claims (3)

[Claims] 1. A coating method for uniformly coating a retroreflective material on a colored reflective layer formed on a predetermined object to be coated with an adhesive layer, wherein the surface to be coated of the object to be coated is substantially the same. A coating method, characterized in that a retroreflective material is applied by spraying from above onto the surface to be coated in a natural falling state while being held in a horizontal state. 2. The coating according to claim 1, wherein the object to be coated is a three-dimensional object, and the object to be coated is rotated about a substantially horizontal rotation axis when the retroreflective material is applied. Method. 3. A coating apparatus comprising a spray coating means for spraying a retroreflective material in a natural falling state onto an adhesive layer on a colored reflective layer formed on a predetermined object to be coated. Rotation means for rotating the coated object about a substantially horizontal rotation axis, and tilt means for tilting the rotation axis so that the coated surface of the coated object is substantially horizontal are provided. And coating equipment.