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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 14:02:30 +0200
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I did not find the promisd one, but send one other meanwhile,  which has an
author who you know well.
Inge

On 11 May 2012 12:17, Inge Hernefjord <[log in to unmask]> wrote:

> 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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