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April 2011

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From:
"Nowland, Russell Howard (Russell)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Nowland, Russell Howard (Russell) <[log in to unmask]>
Date:
Tue, 19 Apr 2011 09:08:01 -0500
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There were several papers and posters presented at APEX this year that discussed transfer efficiency.  I agree adding a step into your stencil is a viable option and I do it often.  You need to have room for the step as there will be an area in the step that will leave paste residue on the stencil which can cause problems.  I also agree about talking to your stencil manufacturer about the technology they can provide.  Also at APEX there was a lot of discussion in the conference sessions and at the IPC-7525 committee meeting about Nano coatings.  Flextronics presented a very good study which proved that the nano coatings allowed area ratios down to .5 with a laser cut electropolished stencil.  Or you could consider a step and the nano coatings to really improve your performance.  If you have access to the conference proceedings the Flextronics paper was S35-01, and the poster was from Bill Coleman at Photo Stencil and it is P-22.  They all clearly showed nano coatings providing a major improvement.  You can also gain major improvement with electroformed with nano coatings.

Good luck,


Russell Nowland
Alcatel-Lucent
Advanced Manufacturing Engineer
Address: 14000 Quail Spring Parkway, Suite 100
Oklahoma City, OK 73134
email: [log in to unmask]
Desk: 405-302-1660
Cell: 405-203-0034
Fax: 405-302-1622
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jean-Francois Bissonnette
Sent: Tuesday, April 19, 2011 7:55 AM
To: [log in to unmask]
Subject: [TN] Stencil Thickness

Hello Technetters,



We have to order a stencil and I'm not too sure what to do in this
situation.  I use IPC-7525A for selecting the stencil thickness.  While 99%+
of the components are way within the Laser Range, 6mil thickness, there is a
component which leads are 11mil x 34mil.  In the 6mil thickness chart, this
falls in the electroform range.  What I'm a risking if I still select laser
cut, 6 mil thickness?  What would you guys suggest?



Thanks to all!



JF



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