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The automatic electrostatic powder coating
line for metal and furniture products is an automatic equipment for powder
coating the surface of metal and furniture products, it mainly includes the
following parts:
it is the
equipment that passes the workpiece through the pre-treatment system, drying
box, powder coating spraying system, curing oven and cooling section in turn
through the hanging conveyor. The specific process flow of the powder spraying
line is as follows:
the workpiece is hung on the
hanging conveyor with a special hanging device so that it can pass through each
process smoothly.
the
workpiece surface is sprayed and cleaned with a high pressure water jet to
remove oil and dust.
the
surface of the workpiece is rinsed with clear water to remove the residue of
the degreasing agent.
repeat the
previous step to ensure the surface of the workpiece is clean.
Immerse the workpiece in deionised water to remove ionic impurities from the
water and improve coating adhesion.
Spray the
surface of the workpiece using deionised water to further improve coating
adhesion.
the
surface of the workpiece is cleaned with deionised water to remove dust and
impurities.
The workpiece is
passed through an inclined section to allow excess water to drip off naturally.
The
workpiece is fed into a drying oven where hot air is used to dry the surface of
the workpiece and remove any residual moisture.
The workpiece is
sent into the cooling section, where a fan is used to cool the surface of the
workpiece and reduce the temperature.
The workpiece is fed into the powder coating spraying system,
which uses electrostatic or frictional charges to adsorb the powder coating
onto the surface of the workpiece to form a uniform layer of powder. Depending
on the coating requirements and efficiency, automatic reciprocating sprayers,
manual sprayers or semi-automatic (automatic plus manual touch-up) sprayers can
be selected. An automatic reciprocating sprayer uses a computer to control the
movement and switching of the spray gun to achieve high speed, high efficiency
and high quality coating; a manual sprayer is used by the operator to spray the
workpiece with the gun in hand and is suitable for small batches or complex
shaped workpieces; a semi-automatic (automatic spraying plus manual make-up
spraying) sprayer combines both automatic and manual methods, with the
automatic gun first spraying a large area of the workpiece and then the The
operator will then make up for any missing or uneven areas.
the workpiece is fed into the curing oven and the powder
layer is melted, levelled and cross-linked at high temperatures to form a
solid, smooth and beautiful coating using different heating methods and
temperature requirements. According to the different heating methods and
temperature requirements, you can choose from tunnel curing ovens, bridge
curing ovens, electric heating curing ovens, gas heating curing ovens, diesel
heating curing ovens, etc. Tunnel curing oven is a continuous workpiece through
a rectangular heating space, suitable for mass production; bridge curing oven
is the workpiece in a circular or oval heating space cycle, suitable for small
and medium-sized production; electric heating curing oven is the use of
resistance wire heating to heat the air, suitable for high temperature curing;
gas heating curing oven is the use of natural gas or liquefied gas as fuel to
heat The gas heated curing oven uses natural gas or liquefied gas as fuel to
heat the air and is suitable for low temperature curing; the diesel heated
curing oven uses diesel as fuel to heat the air and is suitable for medium
temperature curing.
the workpiece is fed
into the cooling section where a fan is used to cool the surface of the
workpiece and reduce the temperature.
the workpiece is removed from
the suspension conveyor and checked for quality and packaging.
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