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Origin :
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Malaysia
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Price :
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To be negotiated
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 Product Description
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Curing ovens - To polymerise the powder applied to
the substrate we must heat both to a high temperature
for a few minutes. This is the curing process.
As powder coatings do not contain solvents (unlike
liquid coatings) a flash zone is not required in the
curing oven. The volume of exhaust gases is also
substantially lower which can also substantially lower
operational costs.
The formulation of the powder coating material
determines to a large extent the curing time and
temperature of the coated object. It will also result in
the specified film properties.
At present we can select from several curing oven
types:
Convection oven:
Is most frequently used and can be divided into directly
fired and in-directly fired ovens. Fuel options are
natural gas, propane, oil or electricity. In the case of a
directly fired oven combustion gases can interfere
seriously with the powder during curing and with film
properties thereafter.
In any oven care should be taken that no high air
velocities exist or are created that could damage the
virgin, or not yet solidified, powder coating layer.
Acceptable air velocities are in the 1 to 2m/sec range.
Infra-Red oven:
Uses radiant energy to heat a product through
electromagnetic waves. Infrared heating works very
quickly. There are three types of emitters - short,
medium and long wave length. Their main
performance differences are operating temperature
(some 2000, 1050 and 600°C respectively) and
radiation efficiency (80, 60 and 50% respectively).
Higher temperatures result in faster heating rates and a
lower efficiency which results in a higher loss through
convection heat.
DUAL OR COMBINATIO OVEN:
Both infra-red and convection are applied. In the infrared
section the powder film is melted to avoid powder
being blown off in the convection section where
additional time is available to complete the entire
crosslinking process.
Induction oven:
Heat is generated in the metal object through induction
of eddy currents. The advantage being, as with infrared,
the powder coating can start reacting before contact
with gas combustion components can take place.
Medium temperature radiation offers the most effective
source of heat for curing thermosetting powders. Gas
fired emitter panels present a panel surface temperature
of 900°C. Electric panels give a surface temperature of
approximately 800°C. The work-pieces should be
maintained at a distance of approximately 300mm from
the emitter panels. Substrates coated with darker colour
powder absorb more infra-red radiation, while objects
with light coloured powder do not heat up as quickly. It
is therefore recommended that each individual powder.
is tested in combination with the curing oven to
evaluate the curing performance.
GMMARI-60124932497
gmmari@rubaybestwing.com
gmmari@streamyx.com
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Other Information
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GMMARI-60124932497
gmmari@rubaybestwing.com
gmmari@streamyx.com
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Products
Penang (
Malaysia
