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DESCRIPTION JPS6289897

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DESCRIPTION JPS6289897
[0001]
FIELD OF THE INVENTION The present invention relates to a method of preventing air pockets in
electrodeposition coating. More specifically, the present invention relates to an air pocket
preventing method which has a simple configuration and can reliably prevent the occurrence of
air pockets. [Prior Art] Conventionally, electrodeposition coating has been widely used for
coating automobile bodies and the like. In electrodeposition coating such as automobile body etc.,
electrodeposition bath is carried out while sequentially moving the object to be treated such as
automobile body suspended in a hanger in the electrodeposition bath, and moving the inside of
the tank from the inlet to the outlet It is what precipitates a coating film. However, in such
electrodeposition coating, due to the relationship between the body structure and the bathing
angle, air is entrained at a portion such as the inner side of the upper part of the back door and
an air pocket is formed. There is a problem that it becomes uniform and rust prevention becomes
uncertain. Therefore, (1) the method of removing the air pocket by changing the open / close
angle of the backdoor at the time of electrodeposition, and (2 the method of adjusting the
entering angle of the body to the electrodeposition bath, etc. There is. [Problems to be Solved by
the Invention] However, among the above-mentioned methods (1), the method of changing the
open / close angle of the back door has a problem that quality defects such as secondary sags of
the electrodeposition coating film occur. (2) The method of adjusting the angle of the body at the
time of entering the tank has a problem that it is very difficult to change the angle. An object of
the present invention is, in view of the above-mentioned point, to provide a method capable of
reliably preventing an air pocket by simple equipment. [Means for Solving the Problems]
According to the present invention, the electrodeposition paint is sprayed toward the material to
be treated from the nozzle of the riser disposed in the bath liquid in the bath of the
electrodeposition bath. The present invention relates to a method for preventing air pockets in
electrodeposition coating characterized by The present invention will be described in detail based
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on the drawings. FIG. 1 is an explanatory view showing an air pocket preventing method of the
present invention, and FIG. 2 is a schematic cross-sectional view taken along line (2) of FIG. In
FIGS. 1 and 2, (1) is an electrodeposition bath, in which an electrodeposition paint is placed. An
object to be treated (4) such as a car body is placed on a hanger (3) which is moved by a
conveyor (2) in the direction of an arrow (Y) so that it can be immersed in the electrodeposition
bath (1) in order. . (5) is a riser provided in the tank portion, and the riser (5) is provided with a
plurality of nozzles (6) for injecting the electrodeposition paint. The riser (5) is connected to the
pipe (8) through the union (7) so that the spray angle of the electrodeposition paint can be
adjusted.
The pipe (8) is provided with a valve (9) for adjusting the injection amount or injection pressure.
00) is a circulation pump for sucking and pressure-feeding the electrodeposition paint in the
electrodeposition bath, and the electrodeposition paint is pumped by the circulation action of the
circulation pump (K)), piping (8), valve (9), union (sword) And is sent to the riser (5) and injected
from the nozzle (6) into the electrodeposition bath (1). The riser (5) is provided on the side of the
electrodeposition bath (1) in proximity to the object (4) as shown in FIG. 2, and the
electrodeposition paint is sprayed toward the object (4). Be done. A jet is generated in the bath
liquid of the bathing portion of the electrodeposition bath (1) by the spray of the
electrodeposition paint, and air taken in when the workpiece (4) enters the bath, and also when
the portion to be treated is bathed The bubbles generated on the surface of the object to be
treated are moved and removed by the jet. Since the formation of the air pocket is thus
prevented, the object to be treated (4) is electrodeposited uniformly. The number of risers (5)
may be appropriately set according to the type, shape and size of the object to be treated (4). In
such a case, a plurality of pieces may be provided along the direction of movement of the object
to be treated (4), or in the middle of the object to be treated (4) to face each other (in FIG. It may
be provided to inject). The riser (5) is preferably disposed at a position approximately 30 to 40
cmM away from the object to be treated (4). The position and the number of the nozzles (6) may
be appropriately selected in accordance with the size of the electrodeposition bath (1), the
injection amount of the electrodeposition paint, the injection pressure, and the like. The injection
amount and injection pressure of the electrodeposition paint vary depending on the size of the
electrodeposition bath (1) and the like, but it is generally about 30 to 5 ON / min and 1.0 to 1.5
kg / GJ. [Effects of the Invention As described above, the air and the like which are caught when
the object to be treated enters the tank can be removed by spraying the paint from the nozzle of
the riser provided in the bath liquid in the tank part. Therefore, the formation of the air pocket is
prevented, and as a result, the object to be treated is uniformly electrodeposition coated.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is an explanatory view showing an air pocket preventing method of the present invention,
and FIG. 2 is a schematic cross-sectional view taken along the line -2 of FIG.
(Major code of the drawing) (1): Electrodeposited bath (4) Two coated articles (5): Riser (6):
Nozzle
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