Extrusion Introduction An extruder is a common machine in industry ...

Objectives for Extrusion
1. Determine the material volumetric feeding rates based on different screw rotating
speed (ω).
2. Find the tube dimensions based on different screw rotating speeds (ω), different takeoff
speeds (v t ) and different pressure differences (p i ).
3. Compare the experiment data with theoretical prediction.
Proposed Goals
1. Run the equipment and determine the volumetric feeding rates based on different
screw rotating speeds. Plot the volumetric feeding rate versus screw rotating speed.
Refer “Investigation of the Thickness (θ) of Tube with Different Screw Rotating
Speeds (ω)” in Experimental Procedures.
2. Plot the tube thickness versus screw rotating speed (ω), take-off speed (v t ) and
pressure difference (p i ).
Refer “Investigation of the Thickness (θ) of Tube with Different Screw Rotating
Speeds (ω)”, “Investigation of the Thickness (θ) of Tube with Different Take-Off
Speeds (v t )” and “Investigation of the Thickness (θ) of Tube with Different Pressure
Differences (p i )” in Experimental Procedures, respectively.
Internal air pressure
(p i ) Hopper
Die
Screw
Screw rotating speed
(ω)
Motor
Motor
Take-off speed
(v t )
Output material
Figure 4. Scheme of control variables in this experiment, where ω is the screw rotating
speed, v t is the take-off speed of the roller and p i is the internal air pressure.