Twin-screw extruder screw diameter Screw diameter refers to the outer diameter of the screw, represented by D, in mm. Like the single-screw extruder, the screw diameter of the twin-screw extruder is an important technical parameter. Its size indicates the production capacity of the twin-screw extruder to a certain extent. The larger the screw diameter, the greater the production capacity.

Screw aspect ratio The screw aspect ratio refers to the ratio of the length of the threaded part on the screw (i.e. 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 represents the diameter of the screw. For the meshing coaxial building block twin-screw extruder, since the screw length-to-diameter ratio can change, the length-to-diameter ratio on the product sample should refer to the maximum possible length-to-diameter ratio. The screw length-to-diameter ratio is an important technical performance parameter. In a certain sense, it indicates the ability of the twin-screw extruder to complete specific production tasks and functions (together with the screw rotation speed and feeding amount), and it can also indicate the size of the production capacity. . However, it should be pointed out that the concept of aspect ratio is no longer as important as in single-screw extruders. In addition to being suitable for specific tasks, the longer the aspect ratio, the greater the production capacity (the production capacity of twin-screw extruders). It depends more on the screw diameter, screw rotation speed, screw configuration and feeding amount).

Screw rotation range The screw speed of a twin-screw extruder can generally be adjusted steplessly. The screw has a minimum rotation speed and a maximum rotation speed. Currently, the highest rotation speed can reach more than 1000r/min. The higher the rotation speed, the greater the shear force and the greater the output.

Introduction to various aspects of twin-screw extruder performance

In terms of chemical performance, the twin-screw extruder is suitable for transporting pressurized or corrosive gases and liquids, and can bring high profits to investors.

In terms of mechanics of twin-screw extruders: if the screw diameter remains unchanged and the screw speed is increased, the torque endured by the screw will increase. When the torque reaches a certain level, the screw will be in danger of being twisted. The twin-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 feed section, increasing the flow rate of the material, and reducing the extrusion resistance.

Due to the continuous expansion of the application market and technological breakthroughs, the overall upward trend can be maintained. A sharp drop in the price of domestic twin-screw extruders in the market is inevitable. Shoddy manufacturing and price wars have affected the overall image and quality of domestic plastic machines. Market competitiveness also hinders the development of the plastic processing industry.