JPH0457387B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for coating an object by immersing it in a paint solution, in which if there is an unpainted area on the object, it can be painted while reliably masking this area. The present invention relates to a dip coating method that enables the above-mentioned methods.

When applying dip coating to a long object that has a non-coated area at one end, it is necessary to mask the non-coated area. Painting efficiency is not good if it takes time and process.

FIG. 1 is a diagram showing a conventional coating method in which dip coating is performed while masking one end of the object W to be coated. In this method, a rubber ring 3 is fitted onto one end of the object W to be coated. A cylindrical cap 4 is fitted to the outside of this ring 3 so as to cover one end of the object W, thereby masking the non-coated portion A of the object W. After masking in this way, the object to be coated W is placed on the pedestal 1, and by operating the hanger 2 attached to the pedestal 1, the paint liquid L stored in a container (not shown) is removed. The object W to be coated is soaked in the tank, and only the coating area B of the object W is coated.

However, with this method, it takes time to attach and detach the cap 4, and the efficiency of the painting work is poor.Moreover, the rubber ring 3 cannot withstand long-term use, and the ring 3 has to be replaced frequently, which increases costs. It will bring about.

Figure 2 shows another conventional coating method, in which an organic solvent-based masking agent (Melcoat) 5 is applied to the non-coated area A, and then the object W to be coated is soaked in the coating liquid L. As a result, the paint L is applied to a predetermined area. The masking agent 5 is peeled off after painting, but since this method requires an organic solvent-based masking agent 5 to mask the non-painted area A, an exhaust system must be installed due to the work environment. . Moreover, the work of peeling off the masking agent 5 is required, which impairs the efficiency of the painting work.

The present invention has been made in view of the above-mentioned problems in the working technique, and aims to enable efficient dip coating. a cup-shaped cover member is placed on the non-painted area to form an air pocket communicating with the outside in the cover member; and a paint applied to the object to be coated. This is a dip coating method comprising the step of immersing the object to be coated together with the covering member in a liquid in a state where it is positioned above.

Next, an explanation will be given based on an embodiment of the present invention shown in FIG.

FIG. 3 shows a case where a paint is applied to an object W having the same shape as in the prior art shown in FIGS. 1 and 2, and a non-painted area A is provided at one end of the object W.

First, as shown in FIG. 3A, the object W to be coated is placed on the pedestal 1 fixed to the lower end of the hanger 2 so that the non-coated area A is located at the upper end. Furthermore, the object to be coated W
As shown in FIG. 3B, a cup-shaped cover member 6 is placed on the non-coated area A located at the upper end of the cover member 6, and an air pocket 7 communicating with the outside is formed within the cover member 6.

Next, as shown in FIG. 3C, by driving the vertical moving means (not shown) attached to the hanging tool 2, the pedestal 1 is lowered and the object W to be coated is covered with the member 6.
At the same time, it is immersed in the paint liquid L while being positioned above. During this dobuzuke process,
Since the air in the air pocket 7 does not escape, the paint liquid L cannot enter therein. The weight of the cover member is set to such a value that the cover member 6 does not float due to the buoyant force within the air pocket 7.

Therefore, when the pedestal 1 is raised from the state shown in FIG. 3C, the paint does not adhere to the non-painted area A, and the paint can be reliably applied to other areas. Incidentally, after the cover member 6 is placed on the object W to be coated, the object W to be coated may be supported on the pedestal 1.

As described above, according to the present invention, an object to be coated having a non-painted portion is supported such that the non-painted portion is located at the upper end, and a cup-shaped covering member is placed on the non-painted portion. forming an air pocket communicating with the outside in the covering member, and positioning the object to be coated together with the covering member above the coating liquid to be applied to the object to be coated. Since the dip coating method includes a soaking process, masking of the desired area can be performed simply by placing the covering member on the non-painted area, making it possible to significantly shorten the time required for masking. . Moreover, there is no need to use an organic solvent as in the conventional method, and therefore no exhaust device is required.

[Brief explanation of the drawing]

1 and 2 are sectional views showing the conventional dip coating method, and FIGS. 3A to 3C are sectional views showing the dip coating method of the present invention. 1... cradle, 2... hanging tool, 6... covering member, 7... air pocket, A... non-painted area, W...
...Object to be coated.

Claims (1)

[Claims] 1. Supporting an object to be coated having a non-painted area so that the non-painting area is located at the upper end, and placing a cup-shaped cover member on the non-painting area to provide air communication with the outside within the cover member. A dip coating method comprising the steps of forming a pool, and immersing the object to be coated, together with the covering member, in a coating liquid applied to the object, with the covering member positioned above.