I'm not an ESD expert... so treat the following with caution, as it may not
be the same situation.
A similar concern was raised by a customer after I recommended forced air
cooling after reflow. "Floating body charging" or similar words.
Not being an expert and thinking this could be of more general concern, I
got a static expert and his gear and we spent an interesting few hours with
meters, ionizers, blowers, factory airlines and so on and found .....
nothing.
We rationalised that the stream carrying charges to the work, would
similarly allow a path from the work. That accidental gas ionizing was no
different (apart from the cash) to deliberate ionising.
Does this make sense?
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW
Sent: Tuesday, March 23, 2010 9:51 PM
To: [log in to unmask]
Subject: [TN] air or nitrogen for drying
We have a number of "airbrush" low pressure nozzles around here for spraying
solvents on reworked boards and for drying them off. I know that nozzles
can create static, but I have had no problems to date and have had no
problem with dust sticking to the boards when I dry them off this way.
I haven't been able to find anything on trying to quantify static from
nozzles used in this way. Does anyone have data? Moving to ionized
blow-off for drying the boards would be painful, as that means yet more
equipment in our small cleaning stations.
Wayne Thayer
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