In message <[log in to unmask]> Victor Li writes:
> 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?

Flexible circuits are big business. The orange coloured film is polyimide, 
which goes under the brand name of Kapton. It is a DuPont product. Components 
may be soldered on using conventional print and reflow, although tooling can be 
a bit tricky. The film stands up to the temperature pretty well - it's the same
stuff used in high temperature wave solder masking tape.
Peter
-- 
...............................................................................
Peter Swanson                                              Oxfordshire, England
INTERTRONICS
[log in to unmask]                              Compuserve: 100120,3641
           http://ourworld.compuserve.com/homepages/Peter_Swanson

     Experience is what you get when you were expecting something else.
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