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September 2002

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Subject:
From:
Mark Hargreaves <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 6 Sep 2002 08:06:17 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (69 lines)
Oliver,
We switched from Oxide to Double-treat a few years ago.
a) No prep prior to lamination, except a pass through tacky rollers.
b) Our dry film lamination process is the same for D-T as it was for oxide.
c) We use an acid dip prior to Ammonium Chloride etch, to remove the double
treat.
------------------------
d) AOI of D-T cores was our biggest challenge- I believe due to stains and
limited D-T/copper contrast.
e) Handling was also an issue.  The D-T finish scratches very easily, and
the scratches are visible through the board.
e) We've since added a small  oxide alternative line, for material types
that aren't available in D-T.

(we're a prototype/ small production shop.  Overall, the switch was very
smooth)

Good Luck,
Mark Hargreaves

        -----Original Message-----
        From:   Oliver Yeo [SMTP:[log in to unmask]]
        Sent:   Friday, September 06, 2002 2:07 AM
        To:     [log in to unmask]
        Subject:        [TN] Double coated copper

        Has anyone converted from conventional copper material and oxide
process to
        double treated copper for their multilayer process?  If you have, I
would
        appreciated it if you could help me in doing a feasibility study to
        eliminate our oxide line and how we may need to change or add to our
process
        to suit double treated copper.

        We are currently using :

        a)      Mechanical brushing to clean the core material (double-side
FR4) prior to
        laminting the etch resist.  I read that double-treated copper cannot
be
        scrubbed and is prone to chemical attack.
        b)      We use dry film etch resist.  Will D-T copper cause us to
change this
        process?
        c)      Ammonium chloride is the etchant.

        Thank you in advance for your help.

        Oliver Yeo
        Quality Manager
        IMP Printed Circuits Pty Ltd
        Tel : 61-8 8262 1444
        Fax : 61-8 8262 6004
        www.imppc.com.au



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