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Infrared dryers provide benefits to processors such as floor space savings, zoned heating and quick heat up and shut down. Other advantages of infrared dryers include:
High efficiency conversion of electrical energy into heat for electrical infrared.
Floor space savings due to smaller size.
Heats only the object without heating the surroundings.
Easy to zone for uniform heating of the product.
Faster response to changing process conditions.
Quick startup and shut down.
Easy to have cut off zones for narrow widths.
Ease of control.
Can be easily added to existing conventional dryers to increase line speeds.
Suitable for solvent-based coatings.
The limitations of infrared dryers include:
Difficult to work with temperature-sensitive substrates.
Scaling up of the heaters is not always straightforward.
Because infrared is basically a surface phenomenon, it iss harder to dry heavier coatings.
It is almost essential to run trial in a laboratory or on a pilot line to confirm the design.
Bob Narang is president of Radiant Energy Systems Inc., Hawthorne, N.J., a manufacturer of infrared and convection oven, dryer and heating systems. For more information, call (800) 486-7786 or visit www.radiantenergy.com.
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