Matt:
     
     I assume you are talking about a flexible printed circuit (FPC).  If 
     you have a single or double sided FPC the continuous flexing should 
     not be a problem.  You want to make sure that the radius is about 10 
     times the thickness of the FPC.  Do not crease the circuit as the 
     conductors in the creased area will work harden and will break very 
     quickly.  An uncreased FPC will last indefinitely.  You can also heat 
     form the radius by wrapping the FPC around a mandrel and placing in an 
     oven at 250-300 degree F for 30-60 minutes, removing from mandrel 
     after thorough cooling.  If you want to discuss off line you can call:
     603-337-1691 or e-mail.
     
     Regards,
     
     Ron Yanuszewski 


______________________________ Reply Separator _________________________________
Subject: Kapton
Author:  [log in to unmask] at !INTERNET
Date:    4/22/97 9:18 PM


Hello friends,
 I have a question about the material Kapton.  Does this material
deteriorate due to flexing (if used in a PC board).  I want to use it to 
wrap around a hinge on a small door that will need to close (where the 
board will bend 180 degrees) and be able to open (where the board will 
bend about 90 degrees).  So the board will need to bend repeatedly 
between 90-180 degrees.  Will this hurt the board?  
 Second, can you just put a crease in the board and end up with the
board in an accordian like shape that would relieve the stress of the 
opening and shutting?  Does this compromise the integrity of the board 
and the wiring?  If anyone has any experience in this, I would 
appreciate some suggestions.  Also if you knew of a better technique or 
material, I would be happy to hear them.  Thanks a lot.
    Matt Leary
    Newgrange Technologies
    Boston, MA
    (617) 338-4171
     
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