patent the wire 16 as extruded is likely too hot for application of the polymer coating until it has been cooled by passing through a cooling unit 18 where a cooling medium such as air is blown against the wire after being cooled the wire passes into a die 20 for extruding plastic coating as shown in fig3 and 4 of the incorporated 39 147 patent according to the description of the 39 147 patent the wire continues through polymer extrusion die 20 which is of annular shape and extends around the wire so that the central axis of the die coincides with the central axis path of the path of wire 16 as it is drawn from extrusion die 14 over a roll 23 and onto a take up roll 24 a motor 25 rotates roll 24 with sufficient force controlled by tension maintaining device 26 as to move wire 16 in a substantially straight and fixed path between die 14 and roll 23 as shown in fig1 bare wire 16 enters die 20 where it receives a polymer coating and becomes coated wire 16 the freshly coated wire preferably passes through a baking unit 32 to cure the polymer it may then pass through an air cooling zone 34 before passing through a cooling trough 36 where the wire is submerged in a cooling medium such as overflowing water by entering and leaving through weirs at.