Sorry
My PDF file did not go through to Technet but you can refer to APEX 2002
papers or February 2002 issue of Global SMT.
Regards,
William E. Coleman
Vice President - Technology
Photo Stencil An ISO 9001 Registered Company
4725 Centennial Blvd.
Colorado Springs, CO 80919
Phone # 719-535-8528
Fax # 719-599-4334
Cell # 719-331-2433
email: [log in to unmask] <mailto:[log in to unmask]>
----------
From: Coleman, Bill
Sent: Monday, May 19, 2003 1:45 PM
To: [log in to unmask]; 'Steve Gregory'
Subject: RE: [TN] Stencil printing SMT Adhesives...
Hi Steve and Joyce
I have attached a copy of a Stencil Glue Printing paper that was
presented at APEX 2002. A version of this paper was also printed in the
February 2002 issue of Global SMT and Packaging.
<<File: APEX paper 2002 Metal Stencils for Glue Printing.pdf>>
William E. Coleman
Vice President - Technology
Photo Stencil An ISO 9001 Registered Company
4725 Centennial Blvd.
Colorado Springs, CO 80919
Phone # 719-535-8528
Fax # 719-599-4334
Cell # 719-331-2433
email: [log in to unmask]
<mailto:[log in to unmask]>
----------
From: Steve Gregory [SMTP:[log in to unmask]]
<mailto:[SMTP:[log in to unmask]]>
Sent: Monday, May 12, 2003 3:00 PM
To: [log in to unmask] <mailto:[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
<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
<http://216.203.210.37/GregM/S02_Shea.doc>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]
<mailto:[mailto:[log in to unmask]]> On Behalf Of Steve Gregory
Sent: Monday, May 12, 2003 3:40 PM
To: [log in to unmask] <mailto:[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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