One approach to the problem of solder and tin strip sludge is to set 
     up a combination bag filter and gravity settling circulation loop from 
     the machine.  If the residues are trapped while they are suspended and 
     before they aggregate in the machine bottom, machinery is cleaner and 
     the solids can be removed off-line with better access.  Some of these 
     particles are very small and freely suspended while the machinery is 
     operating, so that the gravity settling must allow the proper baffling 
     and flow quieting.
     
     Marshall Gurian
     Coates ASI


______________________________ Reply Separator _________________________________
Subject: Solder stripper
Author:  [log in to unmask] at internet
Date:    11/6/96 8:34 PM


I would like to know what will be the best way to clean sludge inside solder 
stripper chamber. we are using HNO3 based chemistry and we tried different 
way like HNO3 with HCl or Sodium hydroxide with sodium glyconate, still it is 
difficult to remove all those sludge which not only short the bath life , but 
also cause salt stains on the copper surface, even mild microetch has 
difficult to remove those white salt spots. Any good suggestion? By the way 
compare to Sn-Pb solder resist, The pure tin seems more easy generate the 
sludge.
     
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