Dek have done a lot of work in this area, with both adhesives and pastes.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Gregory
Sent: Monday, May 12, 2003 10:00 PM
To: [log in to unmask]
Subject: Re: [TN] Stencil printing SMT Adhesives...
Hi Joyce!
Went to that link and there really wasn't anything about printing SMT
adhesives there. I did find a Loctite article that describes the process of
printing variable dot heights from a single thickness stencil...from reading
it, it looks very similar to the Cookson article from a while back.
http://www.loctite.com/electronics/tp_multipoint.html
In that article it also recommends using a polymer stencil. KJ Marketing
in Canada makes polyimide stencils, I tried calling them, but it must be
quitting time already there...I'l try again tomorrow.
Anybody ever try something like this?
-Steve Gregory-
http://216.203.210.37/GregM/S02_Shea.doc
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, May 12, 2003 3:40 PM
To: [log in to unmask]
Subject: [TN] Stencil printing SMT Adhesives...
Hi All!
I've stencil printing adhesives for a while now, but I've run into a
problem with this one assembly. The problem is that on the backside of this
board there are about 30 or so MELF diodes with square endcaps (A JANTX
part), and these parts stand-off the board enough so that the part doesn't
contact to epoxy.
Cookson used to have a good article about stencil design when stencil
printing adhesives, if I remember the article correctly, it stated that with
proper design, you could get the adhesive height taller than the stencil
thickness...I think they took it off their web page because the article was
saying you could get variable dot heights by stenciling the epoxy, and thus
you don't need a Camelot dispenser B^D
I can't increase the stencil thickness, because I'm stenciling epoxy
for 0805's, and I'm afraid if I go thicker on my stencil, the epoxy won't
release with the small openings. Does anybody still have that *.PDF? Or
possibly give me some insight to increase the dot height?
I sure would be appreciative...
-Steve Gregory- ---------------------------------------------------
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