JPH09239309A - Electrostatic coating method for outer surface of construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent splashing from a coating surface and flying of paint particles by the effects of wind by spreading a shield net consisting of a conducting material grounded in a construction whose outer surface is coated with paint by a spray gun with the application of an electrostatic field of high voltage. SOLUTION: A spray gun 1 for coating an outer surface is an air electrostatic spray gun, which is formed so that paint may be atomized and jetted by air forcibly fed from an air compressor 3. A positive electrode of a high voltage generator 4 is connected to the ground 'b' and a negative electrode thereof is connected to a spray gun 1, causing an electrostatic field to be applied between the spray gun 1 and an outer wall 'a', allowing paint particles to be attracted and stuck on the outer wall 'a'. At this time, outside an operator 'c', a frame is assembled by metal poles, and a shield net 5 of high conductivity is spread on the frame to ground it. In this way, the shield net 5 is made a positive electrode to attract floating paint particles, thereby preventing the paint particles from flying to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for electrostatically coating the outer surface of a structure such as a building or a bridge.

[0002]

2. Description of the Related Art Conventionally, the spray coating of the outer surface of a structure has been performed non-electrostatically, and a shield net made of resin fiber is used to prevent floating paint particles from splashing due to the effect of wind and wind from the painted surface Was to be stretched outside the person.

[0003]

With such a method, there are problems that the coating rate of the paint is low, the working environment is poor due to floating paint particles, and there are not a few paint particles leaking from the shielding net and scattering. there were.

For this reason, electrostatic coating has been considered, but the outer wall of the building is mostly made of concrete or wood and has low conductivity, and it is difficult to form a strong electrostatic field. However, there is a problem that although the floating paint particles are reduced, it is necessary to further improve the working environment and further reduce the paint particles leaking from the shielding net.
The problem with bridges is that the coating rate is low due to the strong wind.

[0005]

As a means for solving the above-mentioned problems, the present invention provides a shield net made of a conductive material grounded to the outside of an electrostatic coating spray gun. , An electrostatic field is formed between the shield net and the spray gun, and floating paint particles are attracted to and adhere to the shield net, so that the working environment is improved and the paint particles scattered to the outside can be significantly reduced. effective.

[0006]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a is an outer wall of a building built on the ground b, and a spray gun 1 held by an operator c sprays the paint.

The spray gun 1 is an air electrostatic spray gun, and the paint pressure-fed from the paint tank 2 is atomized and ejected by the air pressure-fed from the compressor 3, and the high-voltage generator 4 is also used. Has its positive electrode grounded to the ground b and its negative electrode connected to the spray gun 1 through a high-voltage cable. The electrostatic particles formed between the spray gun 1 and the outer wall a cause the paint particles to adhere to the outer wall a. It is sucked and applied.

However, since the outer wall a is made of concrete, wood, or the like and has low conductivity, the coating rate is not so high as compared with electrostatic coating of metal parts in a booth in a factory.

Therefore, although less than in the non-electrostatic coating, the coating particles float due to the bounce from the outer wall a and the influence of the wind.

Therefore, in this embodiment, the worker c
A frame made of metal poles (not shown) is attached to the outside of the frame, and a highly conductive shield net 5 such as a mesh made of metal mesh or fibers mixed with carbon in synthetic resin or a mesh coated with conductive paint is stretched on the frame. Ground.

Then, the shielding net 5 serves as a positive electrode and the floating paint particles are sucked, so that the environment of the workplace is improved and the paint particles are prevented from scattering to the outside.

The present invention is also effective for coating the outer surface of a structure such as a bridge in which paint is easily scattered by wind.

An automatic gun may be used as the spray gun.

[Brief description of drawings]

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

[Explanation of symbols]

 1: Spray gun 2: Paint tank 3: Compressor 4: High voltage generator 5: Shielding net

Claims (1)

[Claims] 1. A high voltage generator with one pole grounded and the other pole connected to a spray gun, by the action of a high potential electrostatic field formed between the grounded construct and the spray gun. In a method for electrostatically coating the outer surface of a structure in which paint particles discharged from a spray gun adhere to the outer surface of the structure, a shield net made of a conductive material grounded outside the spray gun is provided. External surface electrostatic coating method.