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November 2004

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Subject:
From:
Mike Fenner <[log in to unmask]>
Reply To:
Date:
Tue, 2 Nov 2004 13:09:40 -0000
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I am not an expert in this area but there might be an acceptable work round
if you have trouble sourcing suitable material

1) ensure the mesh  (of conveyor) or inside of machine is earthed/grounded 
2)Blow with an ioniser [at the end of the tunnel] or introduce ioniser into
air path.

I am surprised to hear there is a charge. Work I did with an EFD supplier
some years ago showed that there wouldn't be as the turbulence from the
drying fans generated enough ions not just to carry charge to the work but
also gave a path for dissipation from it. Maybe fan designs have changed or
something.  We also found that there most certainly couldn't be any residual
charge by doing the above (even with artificially charged samples).

A thought anyway for comment if nothing else.


Regards 

Mike Fenner 
Indium Corporation 

T: + 44 1908 580 400
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SMART 6th European Conference, Brighton 16-18 November 2004
www.smartgroup.org/con2004/conference2004.pdf




-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rick Thompson
Sent: Tuesday, November 02, 2004 1:26 AM
To: [log in to unmask]
Subject: [TN] Aqueous cleaner mats??


We have traditionally used mesh mats in our aqueous cleaner baskets for
protection of small boards. These mats were made out of polypropylene (sp?)
but recently a customer requested that we remove them for ESD concerns
because a charge can be measured on them when exiting the cleaners after
hot-air drying. The only ESD matting we've been able to locate is somewhat
absorbent and tends to become saturated with contaminants over time.  Does
anyone know of any matting that is ESD safe but not absorbent?  I believe
the mats we originally used are fairly common in use; is there documented
evidence that the charge that registers on them is not sufficient to cause
any damage?
 
Thanks in advance for any insights.
 
 
Rick Thompson
Sr. SMT Process Engineer
SMTEK International
 
+1 (805) 532-2800   x-193
[log in to unmask]
 
 
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