METHOD FOR PRODUCING A FOAM BODY BY MEANS OF AN EXTRUSION PROCESS, AND EXTRUSION DEVICE FOR PRODUCING A FOAM BODY

摘要

The invention relates to a method for producing a foam body by means of an extrusion process. A plastic melt is generated within a casing of a first extruder (20). The plastic melt is conveyed to an outlet nozzle (50) of a second extruder (40). The conveyed plastic melt has propellants and expands after the plastic melt has been guided through the outlet nozzle (50). In first longitudinal sections of the second extruder, the plastic melt is conveyed and mixed. In second longitudinal sections of the second extruder, the plastic melt is conveyed and pressure is built up in the plastic melt. The plastic melt is conducted through first and second longitudinal sections in an alternating manner. Temperature differences between different radial positions in the cross section of the plastic melt are thereby reduced before the plastic melt is guided through the outlet nozzle, and the plastic melt which has been thermally homogenized in this manner is guided through the outlet nozzle (50). The invention further relates to an extrusion device for carrying out the method.