Hey Franklin,

Double treat should be packaged to prevent handling scuffs/scratches that
you've
described, sometimes we see this but usually on only a few layers. Have you
any way of
applying brown/black oxide to the laminate?

        Yeah, we can run it through the oxide line, restore the surface
characteristics and save the panel (if we're only talking surface
scratches).  Have you done this - oxided double treat foil?  I wonder if you
have to remove the surface treatment prior to oxidizing?

        Obviously, this treats the symptoms not the causes of the scratches
& scuffs - either in process handling or coming from the manufacturer.

This would prevent any de-lamination
problems (from excessive scratches or contamination from handling) and also
restore the
layers to a more uniform appearance (some scuffs/scratches are visible even
after
press/solder mask).

        My options:
*       revise our material acceptance criteria and reject damaged double
treat
*       scrap in process panels that show too much damage
*       rework scratched panels with the oxide treatment as you suggest.

        Something to take up with our laminate manufacturer.

        Thanks for the ideas.

        Hans

Hope this helps

Franklin D Asbell



Hinners Hans Civ WRALC/LYPME wrote:

> Hi All,
>
> We've gotten a shipment of Double Treated laminate (I won't mention names)
> with slight scratches and scuff marks on every panel (front and back).
> The treatment is gone and copper is showing through in some areas.
>
> Is this normal?
> Do we have to worry about delamination after pressing up?
>
> Hans
>
> ~~~~~~~~~~~~~~~~~~~
> Hans M. Hinners
> Materials Engineer (Process & Manufacturing)
> Warner Robins Air Logistics Center
> Avionics Production Division
> Precision Attack/ Radar/Manufacturing Branch
> Engineering Section
> 380 Second Street, Suite 104
> Building: 640, Mail Stop: LYPME
> Robins AFB, GA 31098-1638
> Voice: (478) 926 - 1970 Fax: (478) 926 - 7164
> mailto:[log in to unmask]
> http://www.robins.af.mil

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