Method for processing a thermoplastic condensation polymer

A method for treatment of thermoplastic polycondensates comprising the steps of following process: incorporating the polycondensate in the solid state, in flakes, in the provided extruder multi-spindle (10) arranged in a housing extending from a hole input (3) to an outlet (8); a first conveying zone (11) for conveying the polycondensate in the solid state; a second conveying zone (12) for conveying the polycondensate melt; and at least one degassing opening (14) located in the first conveying zone (11) in the housing; heating the polycondensate to a temperature below the melting point and degassing and / or drying the polycondensate in the solid state at a pressure below atmospheric pressure; Molten polycondensate between the first conveying zone (11) and the second conveying zone (12); characterized by the fact that the spindles (10) of a narrow extrusorapresentan crosslinked; It prevents the polycondensate flakes can escape from the extruder (1) using a first conveyor device (17) located at the degassing opening (17) and designed as a conveyor screw; providing flocculent polycondensate into the extruder (1) can be dosed by another conveyor device (5, 6; 20), said flakes thinner than 2 mm and having a maximum length less than 20 mm.