wretherford 
I think with the small dia wire, with one single strand and a thin plastic coating.
They just use two driven rollers and squash it. This splits the plastic coating into two strands separate from the copper strand.
You just grab handfuls of this afterwards and rip out the plastic by hand.
There's the possibility of making such a setup using two AC motors, the shaft/bearings and end flanges to hold the bearings.
Chuck away (recycle) the outside housing with the Copper wires in it.
You would have to drive one roller,and have the other one setup so you can adjust the space between the two rollers.
Quite a bit of work to make.
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