of the fastest growing parts of our oven business
is ovens for powder coating. Powder coatings are the
most rapidly growing coatings used today. Powder coating
is the functional equivalent of liquid coating, with
one notable exception: The carrying agent is eliminated,
thereby also eliminating the need for mass
transfer before curing. But the lack of a carrying
agent increases the need for heat transfer,
to fuse the powder before curing. Thus, the design
of an oven to rapidly and accurately fuse and cure
powder coatings requires two distinctly different
ovens alone are best at meeting the needs of one
phase of these dual heating requirements. But,
neither technology alone can effectively and efficiently
meet all of these drying and curing requirements.
Thus, the optimum drying and curing solution is often
an oven that provides a combination:
Infrared and convection heating technologies.
the initial heating phase, the coating particles must
be fused, gelled, or melted. The part and coating
must be raised to the fusion temperature with minimal
air circulation that could disturb or contaminate
the coating. Electrostatically applied powder particles
begin to lose their charge during heating and can
be easily disturbed by vibration or airflow.
maximum productivity during this phase, a high level
of direct thermal energy is required to quickly heat
the coating and part. However, temperature rise must
be carefully monitored and controlled to prevent overshooting
the cure temperature range which could degrade the
coating or substrate.
during the second phase of the curing process, the
part is held for a specific time at curing temperature
to complete crosslinking and polymerization of the
coating. Again, although exact curing temperature
is unique to each powder formulation, it often falls
between 200° F and
to accelerate the cure, the film or fused coating
temperature should be held close to the maximum curing
temperature, but not above. Temperatures above the
maximum are particularly deleterious for powder coatings.
Again, precise control of temperature within the curing
zone is necessary for optimum coating uniformity and
consistency, as well as high productivity.
coated parts come in a variety of shapes and sizes.
Part geometry and characteristics as well as powder
formulation directly affect the oven system design.
Therefore, the oven must be designed to ensure consistent
and precise control of temperature, heat intensity,
and airflow as well as material handling and process
Engineering follows a systematic approach to the design
of powder coating curing ovens. We thoroughly analyze
your needs and constraints, and then design an oven
that will operate efficiently and effectively to produce
the optimum coating characteristics you desire at
the lowest possible cost.
know that no single heating technology, whether gas
or electric, infrared or convection heating, can alone
meet the complex curing requirements of powder coatings.
Each has its own capabilities and limitations. Therefore,
we design our ovens to incorporate just the right
combination of these technologies to achieve the optimum
powder coating results. Our results can be seen on
every utility pole from United Lighting to every grill
from Weber Stevens.
high efficiency ovens increase quality and productivity.
Our ovens hold temperatures to within two degrees
of the set point. And our ovens not only require less
space, but cost less to operate than the systems they