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Date: | Tue, 19 Mar 1996 08:51:29 |
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Hi Lou,
Sounds like you have quite a complicated post cleaning process.
You don't say what kind of through-put you have so I am assuming
you run small to medium volume panel counts.
We had used Dexter 1885 flux for about 2 years (currently using
Dexter 1807.) I believe your best alternative to what you are now
doing would be to purchase a conveyorized post-clean machine. We
are using an Argus machine which consists of:
1. A bank of fans to cool the panels before entering the first
scrubbing chamber.
2. First cold water spray and scrub chamber.
3. Second cold water spray and scrub chamber (water cascades into
the first chamber.)
4. Final cold water rinse.
5. IR dry chamber.
Note: All water is city water, no DI.
We typically see ionic resistivity readings after post clean in
the range of < 1.5 micro grams/sq. cm. NaCl.
If you do prototype volumes, I might have some other suggestions
as we used to have a Lightning machine with a different post-clean
system. (Those were NOT the good old days!)
Good Luck
Dave Rosato
SAE Circuits Colorado
(303)530-1900
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