A co-rotating twin screw extruder with periodically varying screw speed ratio and a processing method thereof

By introducing a screw design with periodically varying speed ratio into a co-rotating twin-screw extruder, the problem of insufficient melt plasticizing and mixing effects is solved, achieving efficient melt mixing and self-cleaning effects, and adapting to the needs of high-speed, high-volume and low-temperature extrusion.

CN117325427BActive Publication Date: 2026-05-08WUYI UNIV
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Patent Information

Application Number
CN202311025025.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-14
Publication Date
2026-05-08
Estimated Expiration
2043-08-14

AI Technical Summary

Technical Problem

Existing co-rotating twin-screw extruders are insufficient to meet the requirements of high-speed, high-efficiency, and low-temperature extrusion in terms of melt plasticizing and mixing effects.

Method used

A co-rotating twin-screw extruder with a periodically varying speed ratio is used. The speeds of the two screws change periodically over time, with equal average speeds and identical screw speed pulsation periods. During operation, the screws exhibit a periodic alternation of left-fast and right-slow, and left-slow-fast again, introducing periodic transient disturbances to enhance the melt mixing effect and ensure screw meshing for self-cleaning.

Benefits of technology

It improves melt plasticizing and mixing effects, increases devolatization efficiency, adapts to high-speed, high-volume and low-temperature extrusion processing, and achieves the screw's self-cleaning function.

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Abstract

The application discloses a co-rotating twin-screw extruder with periodically changed rotating speed ratio and a processing method thereof. The co-rotating twin-screw extruder with periodically changed rotating speed ratio comprises a barrel and a screw mechanism. The barrel adopts an 8-shaped structure with cylindrical holes penetrating each other in parallel with their axes. The screw mechanism is located in the barrel and comprises a first screw and a second screw. The first screw and the second screw rotate in the same direction, the average rotating speeds of the first screw and the second screw are equal, the rotating speeds of the first screw and the second screw periodically pulsate with time, the pulsation periods of the first screw and the second screw are the same, and the first screw and the second screw always rotate in meshing with each other during operation, so that the self-cleaning function is realized. The introduction of the periodic transient disturbance effect strengthens the reinforced melting, mixing and exhaust efficiency, and the co-rotating twin-screw extruder is especially suitable for low-temperature processing of a strong dispersion multi-phase material system.
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