The Procedure
The workpiece to be coated attracts the powder during the
event of electrostatic powder coating. This is because the powder in
the spray gun is electrically charged via an electrode during the spraying
process. As the workpiece is earthed, an electric field is formed in
between the workpiece and the spray gun, thus causing the powder particles
to bond with the workpiece surface. Next, the coated workpieces proceed
through a furnace and the powder is thermally cross-linked to form
a tight film. This process takes place at temperatures of in between
160 – 250 °C, depending on the powder substance used.
Environmental Control?
No trouble whatsoever! Because they are solvent-free,
coating powders are presently classed as belonging to the group
of the most eco-friendly substances. In addition, the reclamation
of coating powder ensures an almost complete consumption without
emission. Accumulated wastewater will be processed in a closed
cycle in order to stop contaminated water from polluting the environment.
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Properties
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Taking into account the preconditioning procedure,
the variable layer thickness of 60 – 120 µm affords
first-class corrosion control. |
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The powder coating is remarkably scratch resistant.
This is a highly significant aspect regarding items such as
roof components. |
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The powder coating in our company is done to the
highest standards. Subsequently, all sheet metal we have coated
is wholly bendable, making it possible to reshape the piece
later on. This is a feature we are particularly proud of, especially
since not every powder coating manufacturer can give this the
same assurance. |
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Powder coated sheet metal is totally impact-resistant.
The much-dreaded chipping off of varnish following blunt impacts
does not occur. |
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Depending on which type of varnish was used, the
product shows a resistance to chemicals such as solvents, acids
and alkaline solutions. |
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For use on roofs and facades, the powder coating
offers first-rate protection against UV-rays, weathering and
corrosion – in actual fact, it provides protection against
all adverse weather conditions. |
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Powder coating is a much favoured method even
in places where high abrasion resistance is of necessity. |
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