Extruder, in particular extrusion welder

摘要

The invention concerns an extruder, specifically a hand-held extrusion welding device. For the purpose of degassing a synthetic material to be extruded that is already partially plasticized in the extruder, the invention proposes a thread-less area between two screw threads of an extruder screw. The compression of the synthetic material to be extruded expels gas from the synthetic material, the expelled gas flows against the feeding direction, and exits from the extruder at a feed opening. The extruder proposed by the invention offers the advantage of a complete, or at least an almost complete, degassing of the plasticized synthetic material.