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> From: Edward Brunker[SMTP:[log in to unmask]]
> Sent: Friday, February 19, 1999 4:32 AM
> To: [log in to unmask]
> Subject: Re: [TN] TechNet: confirmation required (6F2282)
>
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> Subject: TechNet: confirmation required (6F2282)
> Author: "L-Soft list server at IPC (1.8c)" <[log in to unmask]> at
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> Date: 19/02/99 04:21
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> ------------------ Original message (ID=6F2282) (91 lines)
> --------------------
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> Date: Fri, 19 Feb 1999 10:19:56 GMT
> From: "Edward Brunker"<[log in to unmask]>
> To: <[log in to unmask]>
> Subject: Re[2]: [TN] Squeegee Speed
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>
> >The factorinfluencing this effect is how stencil gaskets to the board and
> >you may need to look as points such as : Board finish
>
> >Regards
> >Edward Hale
>
>
> I find this aspect intersting. Resist height is always more than the
> plated copper height. For all alternative finishes with LPI, in my
> experience. The resist over traces leading to pads brings the resist
> up even more. The dome on HASL boards will protrude above, but only
> for a portion of the pad, the edges still remain lower.
> Does anyone spec the resist height to be less than the pads?
> So stencils rest on the resist leaving 10 - 30 microns of free space
> underneath.
>
>
> Regards
> Edward Brunker
>
>
> >Evenin' all!
> >
> > My question is this: My stencil printer operator has said that
> he
> >has to
> >wipe our 6-mil stencil each pass to get the paste in the 20-mill pitch
> >aperatures for a QFP to release well. We are using Amtech NC-559 type 3
> >paste with 89.5% metal. The paste is not old. I considered using type 4
> >paste, which has a much finer powder in it. I was told by Amtech that
> this
> >finer powder paste will pack more densly into the aperatures and I could
> get
> >some bridging, unless I order a new stencil with aperature reductions.
> Our
> >squeegee speed is 0.6 inches/s, or 15mm/s. Is this too slow? Amtech
> >suggested that at this slow speed, the paste could be rising out of the
> >aperature, as if someone pressed on a wet sponge and it rose back to its
> >original shape. What is a good squeegee speed for 20 mil pitch parts?
> >Thanks all!
> >
> >Ryan Jennens
> >TelGen Corp.
> >
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