METHOD FOR TREATING AN EXTRUDED PLASTIC SECTION AND EXTRUSION INSTALLATION THEREFOR

摘要

Method for treating an extruded plastic section having a hollow space and installation suitable for carrying out such a treatment. The installation includes an extruder which has a core for forming the hollow space in the section and, at a distance downstream from the extruder in the extrusion direction of the section, a closing means having a rigid circumferential wall. The installation also has a first conduit connected to a supply orifice which is provided in the circumferential wall of the closing means, a fluid feeder connected to the first conduit and a second conduit connected to a discharge orifice. The discharge orifice is upstream of the supply orifice to provide a fluid film flowing opposite to the extrusion direction between the circumferential wall of the closing means and the extruded section.