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May 2012

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Subject:
From:
Inge Hernefjord <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Inge Hernefjord <[log in to unmask]>
Date:
Fri, 11 May 2012 12:17:17 +0200
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Q4: I have a very extensive paper that describe the topic in advanced
terms, will send to thee if I can find it...
Inge

On 10 May 2012 18:26, Douglas Pauls <[log in to unmask]> wrote:

> OK, last one, at least for now.
>
> What is the prevalence of laser drilled holes relative to convential
> drilled holes?  Is it used a lot or only in certain applications?  Is
> there a size limitation where laser drilling works better (e.g. Microvia
> drilling) than other areas?  Thin laminate vs. thick laminate?
>
> Here is what we say currently:
>
> ·       Some drilling is done via the use of lasers.  If this is not
> tightly controlled, the resin can pyrolize and re-deposit on nearby
> surfaces.  The resin system will have been degraded by heat and the
> redeposited material may interfere with subsequent plating.  This is often
> a problem with laser drilling of holes.
>
> Your thoughts?
>
> Doug Pauls
>
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