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

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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

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

Quantities of the whole machine

Twin-screw extruders are characterized by

Barrel diameter $D$
Centerline distance $A$
Total length of their process section $L$ , which is usually flexible
Maximum permissible torque per shaft $M_{max}$
Range of turning speed $n$

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

Volumetric throughput ${\dot {V}}$
$q={\frac {\dot {V}}{nD^{3}}}$

References

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

External links

www.example.com

[Kohlgr_2020-1] Kohlgrüber, Klemens (2020). Co-Rotating Twin-Screw Extruders: Fundamentals. Carl Hanser Verlag. ISBN 978-1-56990-747-4.

[Kohlgr_2021-2] Kohlgrüber, Klemens (2021). Co-Rotaging Twin-Screw Extruders: Applications. Carl Hanser Verlag. ISBN 978-1-56990-781-8.

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