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Date: | Thu, 07 Nov 96 17:06:24 |
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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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