Influencing factors and parameters in the extrusion process

The performance of an extruder aggregate as a result of the maximum permitted screw speed is limited by the maximum permitted material outlet temperature or by the required level of homogeneity in the extrudate. As a basic result of fundamental trials both the material outlet temperature as well as the level of reached homogeneity is corresponding to the duration time for the compound to stay inside the extruder and the effective shearing rate. This is mostly being determined by the back pressure depending on the profile size and the compound properties and by the screw design or special installed shearing elements like pins. Further important influencing factors, which may influence the performance of up to 30% or even more, are the production conditions such as TCU-settings for screw, barrels and head, and the pin configuration.