JPS62250964A - Dip-coating apparatus - Google Patents

Abstract

PURPOSE:To uniformize the thickness of a paint film by eliminating the rippling on the surface of a liquid, by setting a paint tank to a fixed system and making it possible to move the liquid level of a paint up and down when an article to be painted is brought to a fixed dipping state. CONSTITUTION:A paint tank 2 is a fixed system, and an introducing pipe 10 and a lead-out pipe 12 are respectively provided to the lower part of the rising wall 2a thereof to be opened to a tank 13 for a lower layer liquid 14 through quantitative pumps 9, 11. As the lower liquid layer 14 in the tank 13, fluorocarbon oil is used from such an aspect that the specific gravity thereof is higher than that of paint 1 and the intermingling with the paint 1 is prevented and said oil is not adhered to the surface of an article 6 to be painted and generates no chemical reaction with a paint film. In painting, the article 6 to be painted is dipped in two liquids of the lower layer liquid 14 and the paint 1, and the quantitative pumps 9, 11 are successively driven to increase and decrease the lower layer liquid 14 in the paint tank 2 and the paint 1 is moved up and down with the increase and decrease of said liquid to form the paint film.

Description

[Detailed description of the invention] 〔Technical field〕 This invention relates to a dipping coating device.

[Background technology]

Dipping coating is performed by immersing the object to be coated in paint in a paint tank so that the paint adheres to the object.

Conventional dipping painting is performed as follows. FIGS. 2 and 3 show a conventional dipping coating apparatus. What you see in Figure 2 is a paint tank 2 into which a painter can be placed,
It is composed of a lifting motor 4 installed on a frame 3. After rotating a hoisting shaft 5 by the lifting motor 4 with respect to the paint tank 2 and immersing the object 6, the lifting motor 4 hoists it up. By rotating the shaft 5 in the opposite direction, the object 6 to be coated is pulled up and coated. However, with this device, the object to be painted 6 often vibrates when being pulled up, which causes the liquid surface 7 of the paint 1 to ripple, causing the object to be painted 6 to vibrate.
The thickness of the coating film formed tends to be uneven. the result,
The finished state of the coating is not very beautiful, and the above-mentioned apparatus is not suitable for coating applications that require highly accurate film thickness control.

The coating apparatus shown in FIG. 3 is configured such that the paint tank 2 itself moves up and down with respect to the object 6 to be coated, which is suspended from a fixing member 8. In this apparatus, the paint tank 2 is lifted to immerse the object 6 in the paint 1, and the paint tank 2 is lowered to perform painting. However, according to this coating device, since coating is performed while the paint tank 2 is moved downward, ripples occur on the liquid surface 7 as described above, making it impossible to obtain a uniform coating thickness. .

[Object of the Invention] In view of the above-mentioned problems, it is an object of the present invention to provide a dipping coating device that can perform coating with a uniform and accurate coating thickness and obtain a good coating finish.

[Disclosure of the invention]

In order to achieve the above object, the present invention provides a dipping coating apparatus equipped with a paint tank into which a workpiece is dipped, wherein the paint tank is of a fixed type, and the paint is applied while the workpiece is dipping and fixed. The gist is a dipping coating device characterized by being equipped with a liquid level raising and lowering means that can move the liquid level up and down.

Hereinafter, the dipping coating apparatus (hereinafter referred to as
An embodiment of the coating apparatus (hereinafter referred to as a "painting device") will be described in detail with reference to the accompanying drawings.

FIG. 1 schematically shows an example of a coating apparatus according to the present invention. The paint tank 2 is of a fixed type, and at the bottom of its vertical wall 2a are an introduction pipe 10 equipped with an introduction metering pump 9 and a discharge pipe 12 equipped with a discharge metering pump 11, respectively. Connected to open at another location.

A lower liquid tank 13 is provided separately from the paint tank 2, and the other end of the introduction pipe 10 faces the inner bottom of the tank 13, and the other end of the outlet pipe 10 faces the opening of the tank 13. It is being done.

A lower layer liquid 14 is stored in the tank 13 . This lower layer liquid 14 has a higher specific gravity than the paint 1, does not mix with the paint 1, does not adhere to the surface of the object 6 to be coated, and does not chemically react with the paint film and have no effect. is the condition. Fluorocarbon oil (hydrocarbon oil in which hydrogen is replaced with a fan) satisfies these conditions. Specifically, Fluorinert FC-40 or Fluorinert FC-72 (trade name of Sumitomo 3M Ltd.) is suitable for use. This lower layer liquid 14 is caused to flow into the paint tank 2 through the introduction pipe 10 by driving the introduction metering pump 9. Above the lower layer liquid 14 introduced into the paint tank 2, there is a paint l as an upper layer liquid. In other words, the liquid in the paint tank 2 is separated into two layers, the upper layer liquid and the lower layer liquid.
As the lower layer liquid increases or decreases, the upper layer liquid (paint l) surface rises and falls. As this paint, for example, Ti
(i 5oOc3 H,)r titanium is.

Ethanol dilution 1 of ``Propylate''(TiOz; solid content concentration 3.5%) is used. In this way, the lower liquid 14
In the two-layer liquid where paint 1 is separately placed on top of
Object 6 to be painted is 50mm x 100 dragons, thickness 1.2
Immerse a glass plate of mm.

Therefore, it is necessary that the lower layer liquid 14 be introduced to the extent that this immersion state can be obtained. When the dipping is completed, the object 6 to be coated is fixed at that position. Thereafter, by driving the metering pump 11 for derivation, the lower liquid 14 in the paint tank 2 is transferred to the pipe 1 for derivation.
2 into the tank 13. Accordingly, the liquid level 7 of the paint 1, which was located above the object 6 to be painted, smoothly drops downward, and the paint 1 adheres to the surface of the object 6 to be painted, forming a coating film. It has become so. When the formation of the coating film is completed in this way, the extraction of the lower layer liquid 14 is stopped. In addition, the lower layer liquid is discharged il (discharge V
cj/min is expressed as AXV, where A is the area of the paint surface (cnl) and v is the coating speed (cm/min). After that, the object to be coated 6 is removed and fired. On the other hand, the lower layer liquid 14 is allowed to flow into the paint tank 2 again for the next dipping coating.

As described above, since the coating apparatus is equipped with a liquid level raising and lowering means for smoothly moving the liquid level 7 of the paint 1 up and down when the paint tank 2 and the object to be painted 6 are both fixed, the liquid level 7 Since the coating moves calmly without ripples, a coating film with a uniform thickness can be formed. Under the conditions shown in the above example, the coating speed V = 20c
As a result of dipping coating and firing at a speed of about 1,000 m/min, a uniform TiO film with a thickness of about 1,000 yen was obtained over the entire surface of the object 6, which was a glass plate. especially,
Compared to the case where the lower layer liquid 14 is used, the composition of the paint 1 does not change due to movement in the pump 9.11 or the pipe 10.12, and moreover, when changing to a different paint, This is advantageous in that it saves the effort of cleaning the entire device.

Furthermore, it is advantageous in terms of cost since only a small amount of paint is required.

Note that the apparatus can also be configured so that dipping coating is performed only with paint. The lower layer liquid is not limited to those in the above embodiments, and for example, mercury can also be used. Of course, various types of paint can be used.

〔Effect of the invention〕

As described above, the present invention provides a dipping coating apparatus equipped with a paint tank into which a workpiece is dipped, wherein the paint tank is of a fixed type, and when the workpiece is dipping and fixed, the paint is applied. It has a structure that includes a liquid level raising and lowering means that can move the liquid level up and down. Therefore, with a simple device configuration, the surface of the paint liquid does not ripple during painting, so it is now possible to obtain a coated object with a uniform coating thickness and a good finish.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a coating device according to the present invention, FIG. 2 is a schematic diagram showing an example of a conventional coating device, and FIG. 3 is a schematic diagram showing an example of a conventional coating device. It is a schematic diagram showing an example. l...Paint 2...Paint tank 6...Object to be painted 7...Liquid level 9, 10, 11.12...Liquid level raising and lowering means 14...Lower layer liquid agent Patent attorney Matsu Hon Take Onyo 1 Cause

Claims (3)

[Claims] (1) In a dipping coating apparatus equipped with a paint tank into which the object to be painted is dipped, the paint tank is of a fixed type, and the liquid level of the paint can be moved up and down while the object to be painted is dipping and fixed. A dipping coating device characterized by being equipped with means for raising and lowering a liquid level. (2) The dipping coating apparatus according to claim 1, wherein the liquid level is raised or lowered by increasing or decreasing the amount of liquid in the paint tank. (3) The liquid in the paint tank is separated into two layers; the upper layer is the paint, and the lower layer does not adhere to the object to be painted, has no chemical effect, and does not mix with the paint. The dipping coating apparatus according to claim 2, wherein the liquid has a high specific gravity, and the liquid level raising and lowering means includes a pump device for causing the lower layer liquid to flow into and out of the paint tank.