Electronics Forum | Wed May 28 12:31:18 EDT 2003 | larryk
This is our first experience with running embedded flexs. Our board supplier suggested that we prebake our assemblies before placing components. What does everyone else do? Is prebaking normal when a flex is embedded?
Electronics Forum | Thu May 29 10:14:51 EDT 2003 | davef
In itself none, but heating moisture laden flex can cause the flex to delaminate.
Electronics Forum | Thu May 29 10:05:10 EDT 2003 | swagner
I hate to answer a question with a question but what are the particular effects of moisture absorption in a flex circuit?
Electronics Forum | Thu May 29 14:27:04 EDT 2003 | larryk
This flex is .001" Kapton polyimide. The flex portion of this rigid flex consists of 3 layers of 1 oz copper with 5 layers of Kapton. Part of the flex is sandwiched in standard FR4 with two layer of copper on each side for a finished thickness of .
Electronics Forum | Thu May 29 10:42:40 EDT 2003 | swagner
So is it fair to say that on a moisture laden double sided flex circuit you could see an increase in tombstoning on the 2nd pass due to warpage created by delamination? In other words a 0603 for instance could tombstone due to the delaminated surfac
Electronics Forum | Thu May 29 07:52:44 EDT 2003 | davef
The permeability of polyamide film (Kapton) is 54 g/sq m/mil/day and the total absorption is 2.8 wt%. The absorption rate changes rapidly over time with a large percentage occurring in the first 5 minutes and nearly reaching completion in 30 min to
Electronics Forum | Tue Sep 07 10:58:35 EDT 2004 | davef
http://www.embedded.com/
Electronics Forum | Tue Sep 07 16:07:54 EDT 2004 | pluppie
Thank you very much. One of the pdf's really covered my questions.
Electronics Forum | Mon Sep 06 15:54:53 EDT 2004 | pluppie
Hi, I have to make a presentation about software tools for embedded systems. I've been surfing around but can't find any non-commercial interesting website. If anyone knows some good info, you would make my day. My email is foefeltje@hotmail.Com
Electronics Forum | Thu Feb 01 09:55:20 EST 2001 | davef
Embedded email links in emails don't work either, in the unlikely chance that that's a help.
