Has anyone tried soldering lead free to an Aluminum circuit on polyester?

We are looking at a very simple one component circuit that needs to be on a 
material with some flexibility.  We do run millions of feet of aluminum on 
polyester passive circuits in one of our plants.  I am being asked to see if we 
can take advantage of the in house production to save some cost.

My other thought is to just try a conductive adhesive, but we might need to 
do some tooling for that, as this would require about 3 million of these 
circuits/year.

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