Powder dip coating line is a kind of surface coating technology which is widely used in industrial production. The advantage of this technology is that it is efficient, economical and environmentally friendly. In the coating process of powder dip coating line, the control of coating thickness is a crucial part, because the coating thickness directly affects the quality and performance of the coating.
In this paper, we will introduce the coating thickness of the powder dip coating line from two aspects: the control of coating thickness and the influencing factors.
The control of coating thickness is one of
the most basic tasks in the coating process. The control of coating thickness
of powder dip coating line is achieved by the following aspects
The powder dip coating line adopts
electrostatic spraying technology. During the coating process, the spraying
speed and spraying range of the powder can be controlled by adjusting the voltage,
current and distance of the spray gun or dip. So as to achieve the control of
coating thickness.
The powder dip coating line adopts a
recycling spraying system. During the spraying process, the powder will produce
a lot of waste. Therefore, after the coating is completed, the uncoated powder
needs to be recycled and reused through the recycling system. This will not
only reduce the waste but also control the thickness of the coating.
The oven of the powder dip coating line is
the most critical part of the whole coating process. In the oven, by
controlling the temperature and time, the powder can be melted, flowed and
formed into a uniform coating. Therefore, by controlling the oven temperature,
the thickness and quality of the coating can be controlled.
In addition to the above methods of
controlling the coating thickness, the coating thickness is also influenced by
the following factors
The surface treatment of the substrate is a
very important part of the coating process. If the surface of the substrate is
not properly treated, the coating will be easily peeled off or cracked or split
during use. Therefore, surface treatment such as degreasing, rust removal,
sandblasting, etc. is required for the substrate before painting. Different
surface treatment methods will have an impact on the coating thickness.
The type and granularity of the powder is
an important factor affecting the thickness of the coating. Different types and
granularity of powder in the spraying, its spraying speed and spraying range
are different, so it will have an impact on the coating thickness.
In the oven, the powder melts, flows and
forms the coating. Therefore, the control of oven temperature and time has an
important impact on the coating thickness and quality. If the oven temperature
is too high or the time is too long, the coating may become too thick or paste.
Coating speed and distance can also have an
effect on coating thickness. If the painting speed is too fast or the painting
distance is too far, the coating will become too thin or uneven.
In conclusion, the coating thickness control and influencing factors of powder dip coating line are very complicated.
In order to obtain the ideal coating thickness and quality, the coating process needs to be fully controlled and adjusted.
In practice, coating
engineers need to choose suitable control methods and parameters according to
different coating requirements and material characteristics in order to achieve
the best coating effect.
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