I learn something new from you every time you contribute to this forum,
Werner. Thank you. This explains a lot. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
Sent: Tuesday, February 13, 2007 7:24 AM
To: [log in to unmask]
Subject: Re: [TN] FW: Report from a BGA

Hi Richard,
"Fully Convective" reflow ovens are a misnomer. Depending on the zone
temperature, up to 20% of the heat transfer in these 'Convection Reflow
Ovens' is actually by near infrared radiation. Now the wavelength of
this IR is quite different than the wavelengths of the old quartz lamp
ovens where the radiation comes from much higher lamp temperatures,
however, the platens with all the hoes through which the hot gas flows
into the convection reflow ovens also radiate.



Werner

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