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December 2009

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Werner Engelmaier <[log in to unmask]>
Date:
Tue, 22 Dec 2009 12:19:47 -0500
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 Hi Steve,
Not likely—the properties of the glue layers and the flex substrate are just too far apart.
Question—are the layers primarily glued together for manufacturing purposes? For functionality, these separations may not be a problem assuming your vias are strong enough to act as 'rivets.' Of couser, they look ugly.
Werner

 

 

-----Original Message-----
From: Steve Kelly <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, Dec 22, 2009 11:26 am
Subject: [TN] Via fill on flex


Hi All,

We have a 6 layer flex that my customer has to thermal cycle at temperatures 
beyond the rated Tg's of the material- the end use environment is about as bad 
as it gets. After repeated thermal cycles we start to see cracks develop in the 
glue layer used to bond the adhesiveless layers together. Will some kind of via 
fill help this issue?

Thanks in advance.

Regards Steve Kelly





Steve Kelly (PLEASE NOTE NEW E-MAIL ADDRESS)

(416) 750-8433 (work)

(416) 750-0016 (fax)

(416) 577-8433 (cell)




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