Sorry to be my usual self Brian (&Daan) :
Been there, SEEN THAT, done this :
installed antistatic (carbon brush) on conveyor just prior to entry of P&P ,
BELLOW the card = please don't smudge the paste.
It DOES help especialy (in very much real world) on second pass (adaptable
in real time to printers Daan)
Extremely common in photolabs over film runs = transmuted application from
my 6x6 (not what sounds like)hobby .
Possible indeed (king is his worst enemy), we agree here Brian (with all due
salute)
cu pk
-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Tuesday, 29 February 2000 5:00
To: [log in to unmask]
Subject: Re: [TN] Stencil wear...NOT the metal one!
Alan
I can't really believe your serious about this. In the first place, if your
print shop
has dust or other contaminants floating around, then the housekeeping needs
lokking at.
Secondly, in the real world, You are more likely to charge a board just by
the air
friction moving it between the printer and the placement machine. Do you
REALLY check
boards for static before allowing components to touch it? I've never seen
that done.
It is possible to be more royalist than the king.
Brian
"Cash, Alan" wrote:
> Charged bare boards can attract contaminates from the air for one thing.
> The foremost concern is assembling Electrostatically sensitive components
> onto a charged bare board. The newer designs are using components with a
> sensitivity down to 5 volts in some cases. There are people in the
industry
> who have started to consider a static charge on a pwb as a contaminate.
>
> Al Cash
>
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]]
> Sent: Monday, February 28, 2000 3:15 AM
> To: [log in to unmask]
> Subject: Re: [TN] Stencil wear...NOT the metal one!
>
> Daan
>
> ESD? On bare boards? So what?
>
> Brian
>
> "d. terstegge" wrote:
>
> > >From one of my stencil vendors I heard that ESD is a much greater
concern
> when using polyimide stencils. For that reason he doesn't sell them
anymore,
> in spite of the advantages of polyimide.
> >
> > Bye,
> >
> > Daan Terstegge
> > Unclassified mail
> > Personal website: http://surf.to/smtinfo
> >
> > >>> Murugan Vasudevan <[log in to unmask]> 02/27 8:29 pm >>>
> > 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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