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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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