JPS634877A - Cleaning method for rotary atomization electrostatic coater - Google Patents

Abstract

PURPOSE:To prevent the sticking of an inorg. particle, etc., in a paint and to remove the stuck inorg. pigment, etc. by allowing a solvent or paint compounded with solid particles having the grain size larger than the grain size of paint particles to a paint supply passage of a rotary atomization electrostatic coater at the time of cleaning said passage. CONSTITUTION:The solvent or paint compounded with the solid particles (e.g., Al particles) having the grain size larger than the grain size of the paint particles is allowed to flow in the paint supply passage of the rotary atomization electrostatic painter at the time of cleaning said passage. As a result, the sticking of the inorg. particles, etc., in the paint to said passage is prevented and the inorg. particles, etc., stuck thereto are removed.

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a method for cleaning a rotary atomizing electrostatic coating machine.

[Conventional technology]

Rotary atomizing electrostatic atomizers that can paint while changing multiple colors are used, and with such rotary atomizing electrostatic atomizers, the paint supply path can be cleaned every time the color is changed. It has become.

[Problem that the invention seeks to solve]

Cleaning of the paint supply passage every time a color is changed is normally carried out by alternately flowing cleaning solvent and cleaning air, but the same cleaning solvent is used for all paints, and the paint Depending on the compatibility of the paint and the cleaning solvent, paint scum could accumulate in the paint sprayer's piping or the paint outlet hole in the spray head.

Means for Solving Problem C] In order to solve the above problems, the cleaning method for a rotary atomizing electrostatic coating machine according to the present invention includes a method for cleaning a rotary atomizing rIP electrocoating equipment equipment supply passage. The method is characterized by flowing a solvent or paint containing solid particles having a larger particle size than the paint particles.

〔Example〕

FIG. 3 is a diagram showing a rotary atomizing electrostatic coating machine.

A spray head 10 is attached to a rotating shaft 14 of an air motor 12. A high voltage generated by a high voltage generator 16 is applied to the spray head 10 via the air motor 12, thereby
The air motor 12, which is capable of electrostatically coating objects in the ground area while the spray head lO rotates, is supported at one end of the insulation support 18, and is connected to the other end of the insulation support 18. The unit is mounted on a movable or fixed frame by means of a stand 20. The paint is supplied to the spray head 10 by a hose 28 from a color change cleaning device 24 via a trigger valve 26 . The color change cleaning device 24 is connected to a supply tank for each color via a valve, and is also connected to a supply source of cleaning solvent such as thinner and cleaning air, and supplies various colors to the spray head 10. During color change, color change cleaning device 24, trigger valve 26, hose 28
Also, the paint supply passage formed in the spray head 10 can be cleaned.

FIG. 2 is a sectional view showing the spray head 10 in detail.

The spray head 10 is formed by press-fitting a cylindrical member 10b with a flame into a bell-shaped outer peripheral member 10a, and a large number of ejection holes 10c are provided radially through the cylindrical member 10b. The paint supplied to the rear side enters the spout hole 10.
An axial hole 10d is formed in the center of the cylindrical member 10b. The rotation shaft 14 of the air motor 12 is passed through this hole 10d, and the spray head 1 is thereby
0 can be supported on the rotating shaft 14.

FIG. 1(A) is a diagram showing a state in which inorganic pigment components 30 in the paint accumulate inside the paint supply hose 28, narrowing the passage area. If the inorganic pigment component 30 accumulates, it may not be possible to remove it by simply pouring an ordinary cleaning solvent.
As shown in b), aluminum particles 32 are mixed into the flow of cleaning solvent shown by arrow F.

The particle size of the aluminum particles 32 is on the order of about 10 microns, and the particle size of the inorganic pigment component in the paint is on the order of 0.1 microns. Therefore, the particle size of the aluminum particles 32 used in the present invention is considerably larger than the particle size of the inorganic pigment components in the paint. FIG. 1(b) shows the aluminum particles 32 colliding with the inorganic pigment components 30 in the paint that protrude near the center of the paint supply hose 28, thereby causing the aluminum particles 32 to collide with the inorganic pigment components, etc. Inorganic pigment components 30 in the paint are scraped off by aluminum particles 32 which are hard and have a lot of momentum. Eventually, the inorganic pigment components 30 in the paint are sufficiently peeled off from the paint supply hose 28, as shown in FIG. 1(d), and carried away by the flow of the cleaning solvent.

Not only aluminum particles but also solid particles from the aluminum particles can be used in the cleaning solvent. What is important is that such solid particles have a sufficiently large particle size relative to the paint components so that the collected paint components can be removed by collision. Such solid particles can also be incorporated into paints. In the above example, the case where the paint supply hose 28 is cleaned has been described, but when the paint supply hose 28 is cleaned, the spray head 10 is also cleaned at the same time. The most important thing is cleaning the spray head 10. Further, it is preferable to use aluminum particles because fine aluminum particles are sometimes contained in pigments, and it has been known that there is no problem in their disposal or reprocessing.

〔Effect of the invention〕

As explained above, according to the present invention, by flowing solid particles, it is effective to prevent inorganic pigments in the paint from adhering, and also to remove the adhering inorganic pigments.

[Brief explanation of the drawing]

Figure 1 is a diagram to explain the action of solid particles blended into the cleaning solvent, Figure 2 is a cross-sectional view of the spray head of the rotary atomizing electrostatic coating machine in Figure 3, and Figure 3 is a rotating It is a side view of an atomizing electrostatic coating machine. 10... Spray head, 28... Paint supply hose, 3
0...Paint component, 32...Aluminum Uno, particles.

Claims (1)

[Claims] When cleaning the paint supply passage of a rotary atomizing electrostatic coating machine,
A cleaning method for a rotary atomizing electrostatic coating machine that is patented in that it flows a solvent or paint containing solid particles with a larger particle size than the paint particles.