In message <[log in to unmask]> [log in to unmask] (David Tandy) writes:
> 
> Does anyone have any experiencies or information relating to "Silver Ink
> Screen Print" (or any other form of screen printed conductors).
> 
> We have a situation where we have a number of PCA designs which have only
> a few minor modifications required. These will be picked up at the next
> CAD revision, but in the mean time, we would like to investigate
> screen printing additional connections accross the boards, without the
> need to hand wire.

David,

One area of big use of silver inks is membrane switch or keyboard manufacture. 
In the UK, the sources are Acheson, DuPont, Grace. Kester have also released 
some ink chemistries, I think under the name or Ormet(?). I have some contact 
details if you need them (e-mail or call me direct).

But beware, there are pitfalls in what you want to do - and don't expect to be 
able to solder to it! What about the silver / tin/lead interface, and 
what happens to this after environmental cycling - are you going to 
maintain good electrical conductivity?

There are other options. Some companies can provide a very thin custom "patch" 
circuit, which is bonded to the surface on the pcb.

Regards,
Peter (tel: 01865 842842)
-- 
...............................................................................
Peter Swanson                                              Oxfordshire, England
INTERTRONICS
[log in to unmask]                              Compuserve: 100120,3641
           http://ourworld.compuserve.com/homepages/Peter_Swanson

    Confidence is the feeling you have before you understand the situation.
...............................................................................

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