1. Twin-screw major diameter (D): There are more than ten models of twin-screw extruders, with twin-screw diameters ranging from 12 to 135 mm. Different diameter twin-screws can be matched with motors of different power ratings. For example, the KTE-36 twin-screw has a major diameter (D) of 35.6 mm. It can be matched with 15KW/18.5KW/22KW/30KW/37KW three-phase asynchronous motors.
2. Screw length-to-diameter ratio (L/D): This refers to the ratio of the length of a barrel section (represented by L) to the screw's major diameter (represented by D). They are generally in a 4:1 ratio, i.e., L=4D. The screw length-to-diameter ratio determines the mixing and dispersion effect of the material. Generally, for materials with a high powder filler ratio, a larger screw length-to-diameter ratio should be selected, meaning a longer screw length.
3. Gearbox Torque Rating (T/A3): The torque rating of a twin-screw extruder gearbox is typically 5.6~13 T/A3. A higher gearbox torque rating allows for greater torque capacity, enabling the matching of higher-power motors. Consequently, the twin-screw extruder's production capacity will be higher.
4. Maximum Twin-Screw Speed (rpm): Maximum twin-screw extruder speeds are available in Max. 500rpm, Max. 600rpm, Max. 800rpm, Max. 900rpm, and Max. 1000rpm. Speed and torque are inversely proportional; a higher twin-screw speed corresponds to a lower torque capacity. Different materials have different viscosities and flowability; therefore, a twin-screw extruder with an appropriate speed must be selected based on the material's characteristics.
