The resin nodules is called FUZZ by laminators. A
fiber is composed of 200-500 sigle fillament with
diameter ranged from 3 um to 9 um. If one or several
fillament is broken because of friction or tension by
glass cloth weaving process, you will see resin
nodules
from prepreg.

Best Regards
Shirley





--- "Pelkey, Glenn" <[log in to unmask]> wrote:
> Probably not resin, but rather broken glass fibers.
> I can't remember the
> term exactly, but "pick" somehow sticks in my head.
> Nodules was probably
> the simpler term.  I know the glass cloth
> manufacturer's screen for
> excessive levels of it, but it can also be developed
> during resin
> impregnating with too much line tenison.  Should
> disappear with lamination.
>
> Glenn
>
> -----Original Message-----
> From: Timothy Reeves [mailto:[log in to unmask]]
> Sent: Friday, September 21, 2001 9:56 AM
> To: [log in to unmask]
> Subject: [TN] Prepreg nodules
>
>
> Could any prepreg/laminate manufacturer out there
> (or other knowledgeable
> soul) explain what could cause little bumps or
> nodules on the surface of
> prepregs and why -if they are just resin- they don't
> melt completely and
> leave no evidence of their existence on the
> laminated board?
>
> Tim Reeves
> ECD
>


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