Thanks everyone for the information.
Regards,
John
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of James Mahoney
Sent: Wednesday, August 20, 2008 12:43 PM
To: [log in to unmask]
Subject: Re: [TN] Flex Material Movement at Assembly
Hi John,
Reversing the problem is most likely not an option but as you have indicated
baking will change the mechanical properties slightly and I would try 250
Degrees F for 60-120 minutes and try to align within 1 hour to see if this
helps the alignment issue. I would recommend not storing in the Dry box but
in a storage area of 50% relative humidity and below 70 degrees.
Manufacturers of flex Pyralux recommends 1 year life prior to actual usage
to fabrication but I would think and hope that flex circuits last a long
time without any issues at all.
When designing the flex please consider movement of this nature or sometimes
it's even more cost effective to build in individual circuits so your X,Y is
closer together.
Thank you,
Jim Mahoney
Quick Turn Flex Circuits, LLC
Applications Project Manager
P# 603-821-6571
F# 603-821-5723
M# 603-305-6250
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Anselmo
Sent: Wednesday, August 20, 2008 11:38 AM
To: [log in to unmask]
Subject: [TN] Flex Material Movement at Assembly
Hi All,
A couple of questions concerning flex panel movement at assembly.
We were assembling some 2 layer flex parts with a stiffener and noticed some
movement (or mis-alignment) of the stencil on the 2nd side.
After the 1st side was completed, the panels were stored in a McDry cabinet
for 5 weeks before we finished the lot.
When we finally did finish the 2nd side, we saw a progressively larger
mis-alignment as you went across the panel (from left to right).
The mis-alignment was 5 to 7 mils on a 13 mil wide rectangle pad. These
parts are 10 up in a 7" x 8" panel (2 rows of 5).
So, my questions are; is this type of movement typical? Did storing these
in the McDry add to the problem?
They were stored on end, not lying flat. Should they have been stored flat?
Is there a way to reverse the material movement? Or do we need to complete
the whole lot and not store any in the McDry?
What is the time limit (and conditions) for storing panels that haven't been
completed?
We washed a few panels then baked at low temp (50 deg C) for 15 minutes, and
this helped a little. Just need to know if anyone else has experienced this
before.
Thanks,
John
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