Powder Coating Applications
As the coatings industry changes from solvent based coatings to newer, more
durable and ecologically friendly powder coatings, the role of infrared heat
becomes more pronounced.
Curing solutions that were once obtainable using
a single curing source are no longer the best when dealing with powders. The use
of a convection only cure system will have many disadvantages:
- Uses more energy for heat up, curing and cool
down
- Requires longer curing times, slower line
speed
- Much larger footprint in your facility
- Unresponsive to the flexibility needed to
adjust heat zones for reduced energy
consumption and processing different
parts
- Convection air movement and by-products can
create contaminates on coated parts.
By implementing an electric infrared booster oven
prior to final curing, the surface can be flashed off quickly, initiating the
gel (polymerization) of the powder. This will reduce inconsistencies in color,
contamination and keep powder from being blown off of the part.
There are hundreds of powder formulations in
use today. Film thicknesses range from under 1 mil to over 15 mil and the range
of colors, gloss and applications is equally as vast. What these diverse powder
formulations do have in common, is near-perfect compatibility with infrared
radiation as a method of curing.
New technologies are continually improving finish
chemistry. Precise, reproducible oven temperature control characteristics are needed to
assure the potential of today’s' new powder formulas are met. This is the
custom control you get with electric infrared curing systems.
High Density Board
Fostoria has designed infrared modular
sections that incorporate a custom hi-density refractory board, composed of
aluminum silicate and other non-organic binders. These reflector boards are
especially useful in higher watt density applications such as for curing powder
coatings, and are self-cleaning in many operations.
High-density boards are capable of withstanding
up to 100 watts per square inch and act also as a generator of medium wavelength
infrared.
This greatly benefits the powder finishing and
curing process. As
the coating continues to cure, it in turn heats the product being coated, aiding
in the acceleration of the curing process.
A wash cycle always precedes the application of a
coating, and removal of residual water is essential before coatings are applied.
A Fostoria oven rapidly brings parts to 225 degrees F (or higher if desired),
and evaporates all moisture. Fostoria ovens can also combine drying and
preheating cycles into a single process when necessary, giving manufacturers the
option of a complete powder cure system using only electric infrared. This
greatly reduces the system footprint and cost.
Liquid Finishes
Infrared provides the heat, the cure, the bond, and the catalyst for a wide
variety of industrial processes. Its most important role, however, is one in
which it first found widespread use: the curing of liquid coatings.
Whether solvent-based, waterborne or non-reduced,
infrared is the curing technology of choice among manufacturers of metal,
plastic, and composite parts.
Fostoria Industries is an acknowledged leader in
the design and development of high-efficiency infrared ovens for finish curing.
We were the first to demonstrate infrared’s effectiveness in high speed
production curing, the first to introduce energy-saving zone control, and the
first with virtually every development now regarded as standard in our industry.
Today, what distinguishes Fostoria is our ability
to engineer systems with the power and wavelength, as well as the flexibility
and control, to complement specific coatings systems. Where there is flexibility
in the selection of a coating, Fostoria can also prepare recommendations and
documentation for a finish and curing combination that best matches the
application.
Most ferrous, and virtually all non-ferrous metal
surfaces and composites that are coated with paint, can be cured using electric
infrared systems. The ability to precisely control and zone infrared heat
provides advantages over other curing methods. Additionally, infrared penetrates
the coating and heats from the substrate out, preventing blisters that can
result from trapped solvents.
Automotive & OEM
Applications
Paints & Finishes, Plastics, Glass, Fabrics & Adhesives
Interior Trim & Seating
Fostoria has designed and manufactured OEM curing systems for use world
wide. Just a few of our repeat customers are: GM, Boeing, Lear and Ford. We’ve
handled many different materials for everything from window glass to headliners
to varied interior parts and components. Our experience doesn’t stop with just
ovens. OEMs have also asked us to supply material handling systems.
Fostoria infrared ovens are designed to process
seating components for relaxing fabric, removing moisture and de-wrinkling
vinyl, cloth and leather for seat fabrication; drying coatings on plastic parts,
and packaging finished parts for shipping. Infrared is also the process of
choice for interior parts ranging from seatbelts to carpet.
Shuttle Ovens
Infrared shuttle ovens condition vinyl in a fraction of the time required by
air systems. Often purchased to improve productivity, they simplify handling by
"shuttling" a warm sheet out with each cold sheet put in. The ovens
feature continous feed sensors to assure uniform temperatures, and a uniform
result. Advanced oven modules incorporate an exclusive pneumatic
"trap" to clamp the vinyl on four sides, thus preventing dimensional
changes prior to forming. Common applications for shuttle ovens include: door
panels, dashboards, steering wheel coverings and arm rests. Manufacturers of air
bag compartments use these ovens for pre-heating vinyl prior to vacuum forming.
Storage Ovens
Re-engineered assembly systems for increased productivity have intensified the
need for storage ovens, which heat parts such as wire harnesses, making them
easier to assemble. These ovens are also used where pressure-sensitive adhesives
perform more efficiently at higher temperatures (such as with body side
moldings) and where pliability aids fit (such as with rubber bushings applied to
door fittings).
We offer both infrared and convection storage
ovens. We welcome the opportunity to consult with you regarding these
applications, and to offer some case histories where the use of such systems has
eliminated adhesive peel-off, reduced rework and eliminated related warranty
claims.
Conveyor Ovens
Conveyorized Fostoria ovens are used for a wide variety of glass performance
and decorative effects. Systems are available for tempering and annealing and
for pre-heating and tacking for lamination. Fostoria engineers specialty ovens
to cure inks, ceramic paste and reflective coatings used on head and tail
lights. Pre-heated vinyl sheets are used in the lamination of safety glass,
without heating the glass. Paint on glass applications, including windshield
"perimeter black-out" are common uses for our electric infrared ovens.
Total Systems and Specialty
Systems -
Inks
Fostoria Infrared Systems provide high-speed drying of printing inks. Systems
are infinitely adjustable, so pressmen can fine-tune drying cycles to
accommodate the specific stock, coverage, pile temperature, and ink formula.
Advanced cooling technology is provided through Fostoria’s exclusive
reflector/heat-sink design. When combined with high-velocity/high-pressure
blowers, the result is the highest degree of control and repeatability.
Curing Plus Material
Handling
Fully integrated systems can be engineered for applications in the
automotive, electronics, appliance, and aerospace industries. They are also
applicable to the manufacture of a wide variety of building products, from
window grilles to press-formed panels made from log shavings.
For example, Fostoria offers a turnkey system for
curing, cutting, and handling the "honeycomb" kraft paper used as a
core material in garage doors, man doors, and office dividers. The system allows
the manufacturer to purchase the honeycomb material in its unexpanded state and,
using the Fostoria system, expand the product to the desired length, width, and
cell size. The sequence of operation features:
- Expanding the honeycomb to the correct cell
size by applying the proper tension to the product as it is conveyed.
- Setting the honeycomb to its expanded size by
activating the heat-sensitive resins in the paper. Fostoria’s Transco
ovens provide the perfect solution to this step of the process.
- Cutting the panels to the exact width and
length. The cuts in both directions are made while the web of honeycomb
continues to move on the conveyor system.
- Curing the adhesive after application by a
roll coater and prior to the exterior
panels being attached.
The extension and adhesive curing of honeycomb is
but one of many turnkey system approaches Fostoria’s application and design
engineers can provide to solve complex process and material handling problems.
We can provide the benefit of total system responsibility through our expertise
in both process heating and material handling.
Electric Infrared Heat Sources
Electricity is the energy of choice for
many industrial infrared applications. There are many reasons for its
popularity, such as: installation cost, controllability, ability to produce high
temperatures quickly, and it is a clean form of heat.
Electric infrared emitters provide flexibility in
producing the desired wavelength for a particular application. Fostoria offers a
wide selection of electric infrared heat sources to meet the various
requirements of industrial applications. Each of the different types of heat
sources has particular characteristics which determine the suitability of the
heat source for a particular application.
For most applications, it is sufficient to know
that short wavelength, tungsten filament sources (quartz lamps and G-30 bulbs)
provide high radiant efficiency, deep penetration and a fast rate of response.
Medium and longer wavelength nickel chrome filament sources (quartz tubes and
metal rods) are less radiant efficient, but are more rugged, less expensive, and
in some cases provide the best wave length for the application.
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