PRODUCTS FINISHING — PFonline.com
33
a smaller area. A smaller, more
focused pattern could also better
reach recessed areas. In contrast
to changing the bell cup size,
shaping-air adjustments can be
made while the bell is spraying,
allowing greater f lexibility during
the coating process. If the part
you are coating has both f lat and
recessed areas, the shaping air can
be programmed to automatically
adjust while spraying to better
match the topography of the part.
Shaping air also affects particle
velocity. A higher shaping-air
pressure results in a smaller,
tighter pattern and a higher
particle velocity. A higher particle
velocity will better "push" the
coating material into the recessed
areas while overcoming the elec-
trostatic charge.
Because of the Faraday cage
effect, it can be difficult to pene-
trate recessed areas when spraying
with an electrostatic applicator.
Sometimes just changing one of
the above parameters will produce
the results you are looking for,
although the solution often
requires making multiple adjust-
ments to multiple parameters
(for example, you may need to
lower the voltage and increase the
shaping air pressure). Every combi-
nation of application and coating
is different. Your best approach is
to adjust one parameter, check the
effect and then adjust other param-
eters as necessary.
Learn more at www.carlisleft.com
SOLUTIONS FOR YOUR WORLD
Powder
Coating
Systems
Electrostatic
application
technology
Spray
finishing and
fluid handling
Precision engineered
finishing technology
Five Brands.
One Missions.
Deliver Superior Finishing Solutions.
Infrared curing
and Chain-on-edge
machines
A higher shaping-air
pressure results in a
smaller, tighter pattern and
a higher particle velocity.
LIQUID COATINGS
C L I N I C
Have More Questions?
Find more questions and answers
from our expert clinicians in the
Liquid Coatings Zone.
PFonline.com/zones/painting