Electronics Forum | Wed Dec 22 18:09:07 EST 2004 | kmorris
At a previous job I had been taught that when reflow soldering polyimide flex circuits, it was necessary to pre-bake them before reflow soldering to prevent delamination. Our procedures said that there must be a 1hr bake prior to reflow, and the flex
Electronics Forum | Wed Dec 22 21:14:53 EST 2004 | davef
IPC-FA-251 recommends 121*C for 30-60 minutes for 1 and 2 flex layer circuits. A rigid flex can take easily an hour per layer depending on the construction.
Electronics Forum | Fri Jul 24 16:39:16 EDT 2015 | cnotebaert
have done it in the past, used silicon as it will flex,, however its not the most robust material! tends to peel/flake off.
Electronics Forum | Wed Jul 29 11:28:54 EDT 2015 | pankyb1261
How many times does it have to flex. There are acrylic conformal coatings that can be bent once to 90 degrees or so
Electronics Forum | Tue Mar 21 19:34:32 EST 2006 | Tom Smykowski
Omar: I dealt with this so called "hot bar" process also, and you're right; it's neither reliable nor repeatable. The goal was to attach a flex LCD display to another flex circuit. The flex LCD was constructed of resin and conductive silver particl
Electronics Forum | Sat Jan 21 13:49:14 EST 2023 | pcbsino
perhaps we can help you for this SMT and THT part soldering problem, better not bend it not too hard. Electronic manufacturing pcbsino.com
Electronics Forum | Wed Dec 22 23:29:57 EST 2004 | KEN
Check with Dupont's web site. They have a wealth of information on the various polyimide products they manufacture. I was quite surrised at the differences in materials and in particular the dimensional stability and hydroscopy. Good stuff mayna
Electronics Forum | Mon May 27 18:25:03 EDT 2002 | Carol Stirling
Thanks for the information Reworkman, We are leaning to the theory of better safe than sorry. I think I'd supply the bags and dessicant just to eliminate manufacturing issues. What temps & times do you ask your boardhouse to bake to? Ours said some
Electronics Forum | Wed May 08 11:07:54 EDT 2002 | Carol Stirling
We have a concern with moisture absorbtion/humidity effects on PWBs specifically used for automated SMT (including BGA). I'm sure there is a IPC spec on this and would appreciate the number - I've searched the IPC web-site -no results. Could you t
Electronics Forum | Tue May 21 17:25:28 EDT 2002 | Carol Stirling
Hi Dave F, Thanks for the reply, the question was Customer driven. Could you clarify your recommendations for heat sealed moisture barrier bags please - does this include Nitrogen vac pack? Our production runs are small, so there is an investigat
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