a device to produce strand - shaped products from thermoplastic or elastomer materials comprising a paste extruder having a specially implemented internal volume defined by a cylindrical internal mandrel and an external cylinder mantle . the polymer material is charged in the internal volume . the polymer raw material may be provided as a powder or granulate or as material cores produced in a separate precursor process using the same device . the polymer mass is melted by heating and discharged using an expulsion piston . a static mixing line is provided in the outlet area , in which penetration of the melt flow occurs due to special shaping and uniform mixing of the molten material . a homogeneous material flow is achieved , which is supplied via a melt duct to a conventional longitudinal or transverse extrusion head .