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tanλ = L /π dm

tanλ = L /π dm. Types of screw elements. Conveying: forward flight Mixing: reverse flight Kneading: assembled with an angle. It is important to have a strong positive conveying configuration before repelling kneading element. Elements for generating screw profiles and pressures.

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tanλ = L /π dm

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  1. tanλ = L /π dm

  2. Types of screw elements • Conveying: forward flight • Mixing: reverse flight • Kneading: assembled with an angle It is important to have a strong positive conveying configuration before repelling kneading element

  3. Elements for generating screw profiles and pressures 3/4 P - cut 1/2 P -cut 1/2 P - Rev 1/2 P - 9 units 1/2 P - 6 units 1/2 P 1/2 P - Rev 9 units Twin-flight 6 units 0.75 units Twin-flight 1.5 units 0.75 units Twin-flight Twin-flight 3/4 P 3/4 P - 9 units 3/4 P - 6 units 3/4 P - 9 units 3/4 P - cone 3/4 P - cone 4.5 units Single-flight 9 units 9 units - cut Twin-flight Twin-flight Twin-flight 1/1 P - 9 units 1/2 P - Rev Disks 0.75 units Twin-flight Twin-flight 6 units Cone-screw Shaft Collar Paddles 1 unit Washer Paddles 0.75 units 3 units

  4. Single Screw Extruder

  5. Functions of extruder screw

  6. Net Flow

  7. Simplified model

  8. Degree of intermeshing CL= Shaft center line distance D = Diameter of screw CL/ D ratio is used to characterize the volume and torque limitations of a twin screw extruder.

  9. Counter rotating twin screw extruder

  10. Corotating twin-screw extruuder

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