Good Grief , Brian, if i wouldn't know you better
(just almost digested close to 400 pages of your Clean & Cont.;
which seriously disrupted my night life lately),
i'd have to agree with Kelly's yarn on previous subject .
Yes' you're perfectly correct , but that is not the only thing involved ,
even the mask and silk profiles play role in establishment of what stencils
with what blades,
create whatever gasket seals, etc. ;
and Murugan 's got to validate (try) it on his own .
Anyhoo, rather agree with you on no need of super"efficiencies" ;
than with Daan ; with ESD halloween on bare boards ?
Daan ; you wouldn't just get hooked on vendors fairy tales ,
where is the point of this notion ?
That big separation charge ?
paul
-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Monday, 28 February 2000 19:00
To: [log in to unmask]
Subject: Re: [TN] Stencil wear...NOT the metal one!
Murugan
An early bird non-answer:
Does it matter? I don't know how much the material and etching your stencil
cost
(without the reusable frame) but let's say hypothetically $500. With a 50
kilopass
lifetime, that makes it amortisable at just 1 cent per pass, as opposed to
half a cent
for 100 kpasses. What is 1/2 cent as a percentage of your total end-product
cost? I'll
bet it's less than negligible. Remember that a few faulty prints will cost
you more, in
the long run, than throwing away a stencil which is approaching the end of
its useful
life and trying to get an extra thousand prints out of it.
Vive le pragmatisme :-)
Brian
Murugan Vasudevan wrote:
> Hi technetters..
> here's an early bird question for this week...this one
> is regarding stencil wear. well, i have read in some
> literature that a fully hard laser-etched stainless
> steel stencil can last for more than a 100K cycles
> without ay problem. Now, the problem is, we are
> getting into this business of using a polyimide
> stencil. it is giving great deposits, good release
> characteristics, outperforms the metal stencil for our
> application, etc. etc. BUT...the one thing that
> concerns most of us is .."well, everything is okay
> NOW...but what might happen lets say 50K cycles
> after!?"..and i was wondering if anyone in this group
> has any experience with using such a stencil?" if so,
> i would definitely be interested in knowing how is it
> behaving on a long term basis..
>
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