Co-extruded multilayer plastic pipe, method for producing the same, and device therefor

摘要

A multilayer underground plastic pipe comprising one or more inner pipes (1 ) surrounded by a middle layer (3), and one or more outer pipes (2) enclosing said middle layer. The weight proportion of the polymer in said middle layer to the total weight of the plastic pipe is up to 55%. The middle layer is of foamed thermoplastic filled with filler material.