Extrusion die with device for changing the colour of the extruded article

摘要

The extrusion head (1) for extruding a superficial layer, preferably coloured, on top of a primary layer, preferably not coloured is connected directly to an extruder delivering an extruded product to form the superficial layer. The extrusion head has a selection device (2) able to selectively direct one or other of the coloured extruded products over the primary layer.