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| From [log in to unmask] Fri May 23 08: |
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Frank--
Yes, there certainly is another option to microetching copper prior to
photoresist (and oxide for that matter). Our company successfully developed a
no-microetch precleaning process prior to photoresist for the Photo Chemical
Milling industry, who cannot tolerate the roughened copper surface from a
microetch. We have adapted this technology for the PCB industry, and is
currently being used in several shops.
It is a chemical cleaning process, that has nearly zero metal removal. Hence
the products last longer and are much less costly to waste treat, all without
compromising photoresist adhesion. Your only consumption will probably be due
to dragout. Additionally, chemical costs are drastically reduced over a
microetch.
Consequently, this is the topic of a paper I presented at the IPC show in March
1997. You may find it in the Proceedings entitled; "Elimination of the
Microetch in Innerlayer Processing". Otherwise please feel free to contact me
to request a copy, or talk about the details of this process.
Doug McKesson
RD Chemical Co.
(415) 962-8004
(415) 962-0370 FAX
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