It is not intented for the PCB to go into the solution itself.  A solution of
saturated sodium chloride (NACl) will increases the quenching rate.  The heat
energy will decompose the brime soln. to NaCl and water, which will go back into
solution.  Agitating the regular water will help tremedously as well.  The goal
here is to remove the vapor formed on the surface of the material, because we
all know gas is the worst heat conducting medium.

From studies, water is not sufficient to cool extremely high temp materials
quick enough to preserve the structure.  An agitated iced brime solution must be
used.  You may have to have two sets of medium.  One for cooling......one for
dipping to rid the salt solution, if the extra step is justified.

Jason



[log in to unmask] on 02/02/99 08:53:33 AM

Please respond to [log in to unmask]

To:   [log in to unmask], Jason Smith@LEXMARK
cc:
Subject:  RE: [TN] Wave Solder Carriers Cooling system




Jason

1. How does salt change the heat transfer from the carrier ? (new one to
me!)
2. Sodium Cloride is probably not a very good thing to put near a solder
bath (contamination) or a pcb (corrosion).

Ruben

Sorry to say but the only way to improve the situation is to blow air across
the wet carriers (evaporation is much faster at cooling),
or buy more carriers.

Ensure the carriers are dry before sending them back to the wave !

Regards

Fin

Finlay Buchan                     or Chris Chapman
Technical Director                   Managing Director
Datum Dynamics Ltd                   Datum Dynamics Inc
Tel +44 (0)1290 426200               Tel +1(401)683 5300
Fax +44 (0)1290 426212               Fax +1(401)849 8249
Email [log in to unmask]       Email [log in to unmask]
Web Page http://www.datumdynamics.com


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of <Jason M. Smith>
Sent: Tuesday, February 02, 1999 1:17 PM
To: [log in to unmask]
Subject: Re: [TN] Wave Solder Carriers Cooling system


Put salt in your water solution.  this creates a brime solution that will
extract the heat a bit quicker.  We have cooling fans mounted on both the
exit
end of the wave and atop my exiting conveyor mechanism.  What type of
composite
material are you using.  We don't have any heat problems coming out of the
wave
with our CDM materials.

Jason Smith
Process Materials Engineer
Lexmark Electronics



[log in to unmask] on 02/02/99 06:28:48 AM

Please respond to [log in to unmask]; Please respond to
      [log in to unmask]

To:   [log in to unmask]
cc:    (bcc: Jason Smith/Lex/Lexmark)
Subject:  [TN] Wave Solder Carriers Cooling system




I am currently using wave soldering carriers for some of my modules at wave
solder. We need to use them in order to protect the contact gold fingers.
We are currently using conductive cooling system by submerging them in
water but anyhow at the moment of using them they are still hot and wet. Is
there any possibility of using convective methods and some kind of rolling
conveyors or something?

Please help me out

Ruben

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