Abstract: The influence of twin-screw structural parameters on key mixing parameters has been investigated through the analysis of how eight structural parameters of an intermeshing co-rotating twin-screw extruder affect six key mixing parameters (peak temperature，peak pressure, viscosity dissipation, mixing index, average residence time, and torque results). Orthogonal experiments are chosen as the experimental scheme for the twin-screw extruder. Prediction models for the influence of different structural parameters on the six mixing parameters are established. The co-rotating twin-screw extrusion software Ludovic is used to derive models for calculation, and the calculation results are analyzed using Statistical Product and Service Solutions (SPSS). The results show that: (1) The peak temperature increases with the increase of the lead of the reverse threaded element and decreases with the increase of the lead 1 of the forward threaded element. (2) Compared with a reverse kneading block, a reverse thread element can build up more pressure. In actual engineering, a reverse screw element or reverse kneading block is typically placed in front of the screw exhaust section to create a vacuum. (3)With the addition of reverse thread elements and reverse kneading block elements to the screw, the screw's filling degree and viscosity dissipation will increase. (4) The mixing index increases as the lead of the forward kneading block and the lead of the reverse screw element increase. (5)The reverse screw element and kneading block can extend the residence time of the material in the twin screw. (6) Highly significant factors that influence the torque are forward threaded element lead 2 and reverse threaded element lead.

Key words: twin-screwextruder, structuralparameters, mixingprocess, lawofinfluence, keymixingparameters