Extrusion of polymers
In extrusion, the wire passes through an extrusion head fed with molten polymer from the extruder. The last die in the extrusion head determines the final diameter. Thicknesses of 20 to 500 µm can be obtained with a very wide range of polymers.
Extrusion coating provides a centric polymer coating on wires and cords. The final quality is checked by an automatic diameter control and other test equipment (such as a spark test).