I agree and donât use that material system.
From: Boris Bakshan [mailto:bbakshan@xxxxxxxxx] ;
Sent: Friday, March 17, 2017 10:07 AM
To: Lee Ritchey <leeritchey@xxxxxxxxxxxxx>
Cc: si-list@xxxxxxxxxxxxx; dmarc-noreply@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: Glass Weave Skew
Hi Lee,
The 1078 and 1035 PLYs of Meg6(G) are MS in just one direction, the Fill
direction. I think I showed you the cross section I did in both Fill and Warp
directions.
On Mar 17, 2017 6:17 PM, "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx
<mailto:leeritchey@xxxxxxxxxxxxx> > wrote:
We have done dozens of designs with spread glass with very good skew
results. Unfortunately, the most commonly used resin system in low loss
designs is MEG6 which does not offer it.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx <mailto:si-list-bounce@xxxxxxxxxxxxx>
[mailto:si-list-bounce@xxxxxxxxxxxxx ;<mailto:si-list-bounce@xxxxxxxxxxxxx> ] On
Behalf Of Loyer, Jeff (Redacted sender "jwloyer" for DMARC)
Sent: Friday, March 17, 2017 7:04 AM
To: bbakshan@xxxxxxxxx <mailto:bbakshan@xxxxxxxxx> ; si-list@xxxxxxxxxxxxx
<mailto:si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Re: Glass Weave Skew
No. We found the same issue when we investigated the Fiberweave effect
("Fiber Weave Effect: Practical Impact Analysis and Mitigation Strategies",
2007). We had several identical boards made and the measured skew varied
significantly. Investigation showed the glass bundles wandering
significantly.
But, many are using "spread glass" and similar techniques to mitigate the
effect.
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx <mailto:si-list-bounce@xxxxxxxxxxxxx>
[mailto:si-list-bounce@xxxxxxxxxxxxx ;<mailto:si-list-bounce@xxxxxxxxxxxxx> ] On
Behalf Of Boris Bakshan
Sent: Friday, March 17, 2017 4:23 AM
To: si-list@xxxxxxxxxxxxx <mailto:si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Glass Weave Skew
Hi experts,
Following Eric's paper on designcon and the conclusions regarding the
inherent misalignment of the glass bundles with respect to the edge of the
board, could it be that some of the laminate manufacturers took initiative
to help mitigating the skew problem caused by the way fabrics are built for
so many years?
(
https://www.signalintegrityjournal.com/ext/resources/article-images-2017/410 ;
<https://www.signalintegrityjournal.com/ext/resources/article-images-2017/4103/4103_SIJ_GlassWeave.pdf>
3/4103_SIJ_GlassWeave.pdf
)
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