JP2756793B2 - Electrocoating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an electrodeposition coating apparatus, in particular, to effectively deposit an electrodeposition film and improve the uniformity of the electrodeposition film. The present invention relates to an electrodeposition coating apparatus for improving the finish.

This electrodeposition coating apparatus forms an electrodeposition resist film used particularly for a photoresist of a printed wiring board or the like.

(Prior Art) Conventionally, in an apparatus for forming an electrodeposition resist film for the purpose of manufacturing a printed wiring board, one or more systems of liquid reflux are used to uniformly stir an electrodeposition liquid in an electrodeposition tank. It has a device, and a filtration filter is provided in the reflux system,
This filtration filter was for removing dusts in the electrodeposition liquid or aggregates of the electrodeposition composition.

However, such liquid circulation cannot completely remove foreign substances such as dust in the liquid or aggregates of the electrodeposition composition. In other words, in the case of circulating filtration that is merely attached to the electrodeposition tank or the auxiliary tank, even if foreign matter is generated in the tank for some reason, the volume of the tank is large, and it takes a considerable time for the foreign matter to be filtered, or the inside of the main tank is required It was just floating and not filtered at all. In particular, the agglomerates have been raised as a foreign matter generated as needed from the electrodeposition liquid itself, and have raised a problem specific to coating. These foreign substances adhered to the electrodeposited coating film, which significantly impaired the finished state of the coating film.

In particular, when a pattern is formed by using an electrodeposition method as a photoresist for manufacturing a printed wiring board, the finished state of the coating film required for the photosensitive function after the coating of the electrodeposition material must be fairly good. Must.

In other words, it was a major problem that the pattern could not be formed if the finish of the electrodeposition coating film was poor.

(Problems to be Solved by the Invention) The present invention has been made in view of the above situation, and the problem to be solved is that foreign matters in the electrodeposition liquid cannot be completely removed only by circulating filtration, and the coating film cannot be removed. It adheres to the surface and significantly impairs the finished state of the electrodeposition coating film.

Therefore, even if an electrodeposition coating film is deposited as a photoresist, it is impossible to form a highly reliable high-density pattern.

An object of the present invention is to provide an electrodeposition coating apparatus capable of eliminating and improving the above-mentioned problems of the prior art, simplifying the process, improving work efficiency and reducing manufacturing costs. To provide.

(Means for Solving the Problems) The present invention has been made to solve the problems of the prior art and achieve the above object.

Means taken by the present invention to solve these problems are 1). In an electrodeposition coating apparatus for immersing an article to be supported and transported by a transport tool in an electrodeposition tank containing an electrodeposition liquid, applying an electric power to the paint and the article to perform electrodeposition coating on the surface of the article, An electrodeposition coating apparatus comprising: a foreign matter protection net which covers the object to be coated and is detachable.

And 2). In an electrodeposition coating apparatus for immersing an article to be supported and transported by a transport tool in an electrodeposition tank containing an electrodeposition liquid, applying an electric power to the paint and the article to perform electrodeposition coating on the surface of the article, An electrodeposition coating apparatus comprising: a foreign matter protection net covering the object to be coated and having a device for circulating and filtering an electrodeposition liquid.

It is.

Each of the above inventions will be described in detail with reference to the drawings corresponding to the embodiments.

As shown in FIGS. 1 to 3, the electrodeposition tank (1) is formed in a box shape with an open upper part. The electrodeposition tank (1) stores an electrodeposition liquid (3) in which a photosensitive resin composition is dispersed, and a foreign substance protection basket (4) on a net.

The object to be coated (7) is supported in the basket (4).

The inside of the basket (4) and the external electrodeposition liquid (3) are arranged so that they can be exchanged only through the net of the basket (4).

The basket (4) in FIG. 1 can be easily detached and attached, and the inside of the basket (4) can be cleaned as required.

The basket (4) in FIG. 2 is fixed, but has a circulating filtration device.

Further, as shown in the figure, the circulation of the electrodeposition liquid can be made to overflow from the electrodeposition bath (1) to the auxiliary tank (2) and return to the electrodeposition bath through the filter (6) by the pump (5). .

In the present invention, it goes without saying that the present invention can be used for other than the overflow type electrodeposition bath.

(Operation of the Invention) The present invention has the following operation by adopting the above means.

In the method according to the present invention, since the object to be coated is immersed in the cage (4) where there is no foreign substance or the electrodeposited resin substance and electrodeposited, the foreign substance or the electrodeposited resin substance may adhere to the coating film. As there is no finish, the finish is quite good.

When the circulated and filtered electrodeposition liquid is not injected into the basket (4), the liquid flows in the electrodeposition bath due to the circulation of the liquid due to the action of the net of the basket (4). The thickness of the coating becomes uniform.

EXAMPLES Hereinafter, each invention will be described in detail with reference to examples.

Example 1 As shown in FIG. 1, an electrodeposition bath (1) is formed in a box shape with an open top, and an auxiliary bath (2) is formed on the side of the electrodeposition bath (1). The electrodeposition bath (1) stores an electrodeposition liquid (3) in which a photosensitive resin composition is dispersed, and is provided with a foreign matter protection basket (4).

This foreign matter protection basket (4) is box-shaped, and the space between the object (7) and the object (7) is set at about 10 cm. The liquid inside and outside the basket (4) is passed through the net of the basket (4). It is arranged only to be able to exchange. This net used stainless steel 300 mesh. The basket (4) can be detached for cleaning.

The circulation of the electrodeposition liquid overflows from the electrodeposition bath (1) to the auxiliary tank (2), and returns to the electrodeposition bath (1) through the filter (6) by the pump (5).

The object to be coated (7) was supported in the basket (4) and electrodeposited by the constant voltage method in the above-mentioned state. As a result, the finish of each surface of the object to be coated (7) was good and the film thickness was larger than the set value. ± 1 μm.

Embodiment 2 The difference from Embodiment 1 is that the foreign object protection net is of a fixed type, and furthermore, the circulating system is sucked from the inside of the car (4) as shown in FIG. It is a system that discharges. Otherwise, the electrodeposition was performed in the same manner as in Example 1. As a result, stable high-speed electrodeposition was enabled, the finished state of the coating film was good, and the film thickness was ± 1 μm with respect to the set value.

Embodiment 3 The difference from Embodiments 1 and 2 is that oscillation was added. Other than that, the electrodeposition was performed in the same manner as in Embodiment 1. As a result, even if the oscillation was performed, the current value and the voltage hardly fluctuated. The finished state of the coating film was remarkably good.

Example 4 The difference from Examples 1, 2, and 3 was that a plurality of objects to be coated (7) were used (five sheets as a printed wiring board). The thickness variation in the coating (7) and between the coatings (7) was ± 1 μm, and the finish was quite good.

(Effects of the Invention) As described in detail above, in the present invention, 1). In an electrodeposition coating apparatus for immersing an object to be supported and conveyed by a carrier in an electrodeposition bath containing an electrodeposition liquid, applying an electric current to the paint and the object to perform electrodeposition coating on the surface of the object, An electrodeposition coating apparatus comprising: a foreign matter protection net which covers the object to be coated and is detachable.

2). In an electrodeposition coating apparatus for immersing an article to be supported and transported by a transport tool in an electrodeposition tank containing an electrodeposition liquid, applying an electric power to the paint and the article to perform electrodeposition coating on the surface of the article, An electrodeposition coating apparatus comprising: a foreign matter protection net covering the object to be coated and having a device for circulating and filtering an electrodeposition liquid.

Accordingly, the process can be simplified, the working efficiency can be improved, and an electrodeposition coating film having a low production cost and having no problem in quality can be provided.

That is, since the electrodeposition coating apparatus according to each invention immerses the object to be coated in a cage (4) in which foreign matter or an electrodeposited resin material cannot exist, electrodeposition is performed. No finish adheres, so that the finish is quite good.

Further, the use of the net reduces the liquid flow and does not locally increase the liquid flow over the entire surface of the object to be coated, so that the uniformity of the coating film can be further improved.

[Brief description of the drawings]

1 and 2 are cross-sectional views showing a schematic structure of an electrodeposition coating apparatus according to the present invention, and FIG. 3 is a view showing a foreign matter protection net 1 according to the present invention.
It is a perspective view showing an example. DESCRIPTION OF SYMBOLS 1 ... Electrodeposition bath, 2 ... Auxiliary bath (overflow bath),
3 ... electrodeposition liquid, 4 ... foreign matter protection net (cage), 5 ...
Circulation pump, 6 ... Filter, 7 ... Substrate.

Claims (1)

(57) [Claims] 1. An electrodeposition coating apparatus for immersing an object to be coated in an electrodeposition bath containing an electrodeposition liquid and applying an electric current to the paint and the object to perform electrodeposition coating on the surface of the object to be coated. A foreign matter protection net that covers the coating material, and furthermore, the inside of the foreign matter protection net and the outside electrodeposition liquid are injected into the foreign matter protection net by injecting the circulated and filtered electrodeposition liquid outside the foreign matter protection net. An electrodeposition coating apparatus characterized in that it can be exchanged only through a device.