Hi Victor -
     
     Just to add to Ron's comments, we have had only one additional issue 
     pertaining to soldering of flex circuits - moisture considerations. We 
     tuned our hand/wave/reflow processes so that we avoided having 
     delamination problems. Some designs we prebake, sometimes designs we 
     control temperature application carefully otherwise we have had the 
     same success as Ron described. Good Luck.
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Re: flexible circuit
Author:  [log in to unmask] at ccmgw1
Date:    12/18/96 8:21 AM


     
     Victor:
     
     Flexible printed circuits have been around since the late 50's and have 
     improved greatly with the advent of new materials such as adhesiveless 
     polyimide film.  The FPC can be soldered using all of the conventional 
     methods available for rigid PCB's.  In some instance the FPC should be 
     palletized or rigidize for ease of assembly.  There are various 
     materials such as thin, bendable FR4, mylar, Nomex, teflon, polyimide, 
     etc.  As with rigid boards there are also different processes to add 
     the conductors such as additive, subtractive, metal filled epoxy, etc.
     
     If you have further questions, I would be happy to help.  Call 
     603-337-1691.
     
     Regards,
     
     Ron Yanuszewski
     
     
______________________________ Reply Separator _________________________________
Subject: flexible circuit
Author:  [log in to unmask] at !INTERNET 
Date:    12/17/96 11:22 PM
     
     
Hi, 
     
I have seen some SMT components laying on circuits on a sheet of plastic, 
which can be folded and saves some space.  I also heard that cellular phone 
or camera uses this kind of circuit board due to the limited space available.  
     
My question is : how do they solder the components onto it?  Normal 
reflow?  Would it go through the 200C without damage?  What is the 
material of it?
     
Thank you very much.
     
Best regards,
     
Victor
     
     
     
     
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