Abstract: The maximum output of solid convey for Φ34 mm co-rotating twin screw extruder were optimized by response surface methodology method. A quadratic multinomial equation model using the maximum output of solid convey as the objective function was built, and the main influence factors and their corresponding relationships were discussed. It showed that the deviation between predicted values by the model and experimental values was less than 10 %. The maximum output of solid convey were obtained as follows, screw speed was 124 r/min, the helix angle of the screw was 32 °, and the diameter of the solid particle was 2.7 mm. After optimizing the factors, the maximum output of solid convey was 534 g/min and was increased by 7.2 % compared with the value before optimizing.

Key words: co-rotating twin screw extruder, solid convey, response surface methodology, optimization