3. Extruder

The extruder is an essential component of the wiring line. It can be used for "conventional" extrusion or for reactive extrusion (foaming, cross-linking). In "conventional" use, its function is to convey, melt, homogenize and pressurize the insulating material. For the two extrusion processes specific to cables, foaming and cross-linking, it is also used as a chemical reactor. The reasons for using these special processes lie in the specific characteristics required of the cables. For data transmission, signal propagation speed depends on the cable's dielectric constant; for power transmission cables, higher mechanical strength at higher temperatures is required.