All,

Has anyone else had foaming issues in an aqueous wash batch cleaner?
What are some of the causes of excess foaming?  We are applying our wave
flux via spray; however this flux is also suitable in foaming flux
applications.  We are currently in the process of optimizing our flux
application in the wave to significantly reduce the flux residue on the
boards.  This includes optimizing the sprayers, preheats and dwell time.
Initial tests show this is not having a major impact in reducing the
foaming.  We will be testing boards with only SMT flux residue, then
ones with only wave flux residue.  The theory is that by themselves they
do not foam but when mixed cause foaming.  We have recently changed
Paste suppliers, thus we now have two different manufactures of flux
mixing in the wash (one from SMT, one from wave).  Could this be a cause
of excessive foaming?

 

Thanks,

Rob Strecker


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