The diameter of the screw of the dual-screw extruder is represented by D, and the unit is mm. Like the single-screw extruder, the screw diameter of the dual-screw extruder is an important technical parameter, and its size indicates the production capacity of the dual-screw extruder to a certain extent. The larger the screw diameter, the greater the production capacity.
The screw length-diameter ratio refers to the ratio of the length of the threaded part on the screw (that is, the effective length of the screw) to the diameter of the screw, expressed by L/D, where L is the effective length of the screw, and D is the diameter of the screw. For intermeshing co-rotating twin screw extruder, the aspect ratio on the product sample should refer to the maximum possible aspect ratio since the screw aspect ratio can vary.
The screw aspect ratio is an important technical performance parameter. In a certain sense, it indicates the ability of the dual-screw extruder to complete specific production tasks and functions (together with the number of screw revolutions and feeding amount), and it can also indicate the size of the production capacity. . But it should be pointed out that the concept of aspect ratio is not so important in single screw extruders. In addition to being suitable for specific tasks, it is not that the longer the aspect ratio, the greater the production capacity. (The production capacity of a dual-screw extruder is more determined by the screw diameter, the number of screw revolutions, the screw configuration and the amount of feed).
The screw speed of the dual-screw extruder can generally be adjusted steplessly, and the screw has a minimum number of revolutions and a maximum number of revolutions. The higher the rotational speed, the greater the shear force and the greater the output.
In terms of chemical properties, dual-screw extruder is suitable for high-pressure or corrosive gas and liquid transportation, which can bring high profits to investors.
In terms of mechanics of double screw extruder machine: if the screw diameter is unchanged and the screw speed is increased, the torque on the screw will increase. When the torque reaches a certain level, the screw will be in danger of being twisted and broken. The double-screw extruder can reduce the torque and improve the bearing capacity of the screw by improving the material and production process of the screw, rationally designing the screw structure, shortening the length of the feeding section, increasing the flow rate of the material, and reducing the extrusion resistance.
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