based and waterborne coatings are the most common
coatings used in industrial finishing today. The coatings
provide for simple, effective, and efficient application
and finish. Additionally, waterborne coatings are
also quite environmentally friendly. But the carrying
agents, whether solvent or water, must be removed
in the drying and curing process, requiring not only
the transfer of heat to the part and coating, but
significant mass transfer as well. Therefore, the
design of an oven to rapidly and accurately dry and
cure liquid coatings is not just a simple task: It
is an engineering challenge.
products come in a variety of materials, shapes and
sizes. Coating formulation and application also directly
affect the oven 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 control.
more importantly today, as your formulations change
to deliver the quality and environmental compliance
you require, the oven must be designed to provide
the flexibility to meet your everchanging needs. From
solvent based to waterborne to high solids and even
powder coatings, Thermovation Engineering ovens can
meet your everchanging needs.
optimum solution for drying and curing liquid coatings
are often not just hot air ovens. The solutions may
be ovens designed to capitalize on all of the beneficial
characteristics of the two most common and effective
process heating technologies availableinfrared
heating. We call these solutions combination
properly dry and cure liquid coated parts, an oven
must provide at least one, and in most cases two,
distinctly different heating phases. The first and
most critical phase is the mass transfer stage, or
drying stage. In simple terms, the solvent or water
must first be removed before the second phase, the
curing stage, can begin.
more complex terms, the oven must initially supply
thermal energy to the part and coating until the vapor
pressure of the liquid carrying agent, whether solvent
or water, is higher than the vapor pressure of the
carrying agent in the air surrounding the coating.
The thermal energy supplied to the coating increases
the vapor pressure of the carrying agent. Thermal
energy supplied to the air surrounding the coating
concurrently reduces the relative humidity of the
air, thereby increasing its ability to absorb vapor.
Again, the removal of the carrying agent is called
mass transfer. Then once the carrying agent has been
removed, the part and coating must be raised to and
accurately maintained at the required curing temperature
for the period of time specified. Most liquid coatings,
but not all, require this additional time, or second
phase, to complete the cure.
Engineering follows a systematic approach to the design
of liquid coating ovens. We thoroughly analyze your
needs and constraints, and then design an oven, handling,
and control system that will operate efficiently and
effectively to produce the optimum coating characteristics
you desire at the lowest possible cost. Our results
can be seen in motors from Lincoln Electric to lighting
fixtures from GE.
know that no single heating technology, whether gas
or electric, infrared or convection, can alone meet
the complex and changing requirements of today's liquid
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 results.
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