User:Trex4321/sandbox/Co-rotating twin screw extruder

Co-rotating twin screw extruders are a type of extruders used for compounding of plastics[1]: 2–4  and pharmaceuticals [2]: 331–339 , devolatilization of polymers[2]: 263–289 , food processing[2]: 304–329 , production of masterbatch [2]: 230–251 , reactive extrusion [2]: 252–260 : 290–301  and other tasks.

Working principle

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Operating principle of two intermeshing screws cleaning each other and the barrel

Co-rotating twin screw extruders consist of two screws situated in a barrel which turn in the same direction at the same speed. The basic geometry of these machines is self-cleaning: In a pair of screws, one screw wipes the other one, and the barrel is wiped by the tips of the screws.

Process and machine characteristics

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Quantities of the whole machine

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Twin-screw extruders are characterized by

  • Barrel diameter  
  • Centerline distance  
  • Total length of their process section  , which is usually flexible
  • Maximum permissible torque per shaft  
  • Range of turning speed  

Extruder processes in twin screw extruders can be characterized by the following characteristic numbers:

  • Volumetric throughput  
  •  

References

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  1. ^ Kohlgrüber, Klemens (2020). Co-Rotating Twin-Screw Extruders: Fundamentals. Carl Hanser Verlag. ISBN 978-1-56990-747-4.
  2. ^ a b c d e Kohlgrüber, Klemens (2021). Co-Rotaging Twin-Screw Extruders: Applications. Carl Hanser Verlag. ISBN 978-1-56990-781-8.
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