| abstract |
A process for manufacture by extrusion of profiled products of expanded plastic material is disclosed. A foamable thermoplastic composition is extruded through a die into a zone of lower pressure, said zone being defined by a ''''cylindrical'''' cooled surface parallel to the direction of extrusion, a part of this surface being in prolongation of a part of the die outlet perimeter. A foamed, thermoplastic extruded shape having a cellular core and a non-foamed, integral, thick skin on a longitudinally constant part of its surface is formed by the process. |