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July 2010

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Date:
Wed, 21 Jul 2010 11:22:53 -0400
Content-Type:
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Scott,
This all sounds good enough to write a conference paper on!
Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Post, Scott E
Sent: Wednesday, July 21, 2010 11:17 AM
To: [log in to unmask]
Subject: Re: [TN] Baking in tape & reel

Good point on the hole in the bottom of the pocket, Bev.  What I may do
is bake at 30C in vacuum and pull a sample every few days and run
thermoire.  I'll quit baking when the parts remain flat during reflow.
I called the place that I had do the tape & reel and they weren't sure
how the cover tape glue would react to the heat.  They were also
concerned about the plastic reel warping, but that doesn't concern me
since it would be easy to restring them on a new hub by hand.

Scott Post 
P.O.U. 0000-001E-0CTC
2151 E. Lincoln Road 
Kokomo, Indiana    46904-9005 
765-451-2983 (Phone) 
765-451-0287 (FAX) 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Wednesday, July 21, 2010 10:26 AM
To: [log in to unmask]
Subject: Re: [TN] Baking in tape & reel

Scott,
Some reels manufacturers are OK with 40C bake, others are not. Same for
the component manufacturers that use reels. 

Many reel pockets have a hole in the bottom, so vacuum not an issue. I
would not expect the others to be hermetic either. However, vacuum MIGHT
remove adhesive solvent and change peel. 

There are other potential problems with vacuum that have been discussed
on TechNet. 

30C? Hmm. Would have to plot it, but you might be looking at an
exponential increase in required drying time. 
Bev
RIM

----- Original Message -----
From: Post, Scott E [mailto:[log in to unmask]]
Sent: Wednesday, July 21, 2010 10:12 AM
To: [log in to unmask] <[log in to unmask]>
Subject: [TN] Baking in tape & reel

I have some BGAs (not active - just daisy chained with dummy die) in
tape & reel that I need to bake.  I know I could remove them and put
them in trays for baking, but for various reasons I'd like to avoid
this.   Based on the component thickness, JEDEC recommends 13 days at
40C.   My main concern is that heat will effect the glue on the cover
tape and make the reel a pain to use on an SMT feeder.   I have an oven
that has a nitrogen feed and a vacuum pump, so either inerting or vacuum
is an option.  Has anyone played  with using lower temps (30C?) but
either inerting or pulling a vacuum?  I'm concerned that a vacuum may
collapse the cover tape into the pockets and pull the glue loose.

 

I don't necessarily need to reset the moisture clock to 0 either - I
just need to reduce the warpage.  These are 0.4 mm pitch and I'm getting
shorting in the corners.  I ran Thermoire on samples before and after a
125C overnight bake and the unbaked samples turned into potato chips
above 200C.  The corners are warping 200 microns towards the board.  The
baked samples stay flat during reflow.  I'm re-introducing moisture to
the baked samples and I'll run Thermoire again to make sure moisture
caused the warpage rather than some uncured material that I cured during
the 125C bake.

 

Scott Post 
P.O.U. 0000-001E-0CTC
2151 E. Lincoln Road 
Kokomo, Indiana    46904-9005 
765-451-2983 (Phone) 
765-451-0287 (FAX) 


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