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January 1998

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Date:
Thu, 22 Jan 1998 09:30:24 PST
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     Hi all,

     Our ammonia etcher is followed by a replenisher rinse consists of 4
     cascade rinse chambers. As I understand, all ammonia etchers are
     followed by some cinfiguration of replenisher rinse, and when I ask
     what is the purpose of it, I was told that the rep. rinse is to
     1) Decrease the copper content in the subsequent rinse water
     2) Increase the copper content in the etchant that enter the etcher
     3) Give a finishing touch to the etched panels

     I understand point#1, but not #2 and 3. Why would one want to increase
     the copper concentration in incoming etchant? Won't that defeat the
     purpose of feeding "fresh" etchant? And how does rinsing in cold,
     fresh etchant give a finishing touch to the etched panels?

     Regards,

     Yee T.G.
     Hadco Corp.

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