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topic 2118

Infrared vs. Convection for Powder Coating Oven?


(1998)

Q. We currently have a 10 year old powder coating system in use which applies epoxy powder. Our cure oven is a forced air gas fired system. What are the pros and cons of and infrared cure to a convection cure? What would be a good source of information on this topic.

Scott B [last name deleted for privacy by Editor]
- Bradford, Pennsylvania


January 12, 2009

A. Hi, Scott. I recommend "Powder Coating" by Roger Talbert -- a 141-page softcover published by Chemical Coaters Association International, Cincinnati (ccaiweb.com). It has a 10-page chapter about curing ovens, with sketches, as well as info about dry-off ovens, and it clearly explains the features that should be included in each type of oven and why.

I don't have it in front of me, but I think it suggested as one good possibility using infrared heaters at the entrance door even with convection heating. Good luck.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


April 13, 2016

A. Hi Scott to keep it short, infrared is typically more energy efficient. It can sometimes cure a bit faster as well depending on a lot of variables. Its downsides include that the infrared waves need to be able to contact all the surface that need curing, which makes it a less ideal application for products with a lot of recesses and deep angular faces. There are also sometimes challenges with certain coatings or substrates due to the coatings being reflective or substrates being absorptive. If you want a bit more information here are a couple of good articles:

www.pittsburghsprayequip.com/2016/04/12/infrared-vs-convection-paint-curing/

or another good article

www.pcimag.com/articles/94197-convection-vs-infrared

Hope this helps!

Patrick Harmon
- Pittsburgh, Pennsylvania



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