There are usually two options for installing the screen changer in the melt pump: upstream or downstream. The following is a detailed analysis and comparison of two installation positions: Upstream installation: When the screen changer is installed upstream of the melt pump , it is an obstacle to pressure. Therefore, the extruder itself must perform certain pressurization. However, compared to the melt pump, the pressure boosting capacity of the extruder is relatively low. When the extruder pres