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

7. Measure the outer diameter (D o ) of the obtained tube to obtain outer radius (R o ).
8. Calculate the inner diameter (Di) from Eq. (16) to obtain inner radius (R i ).
9. Calculate the thickness (θ) from Eq. (17)
10. Repeat several different screw rotating speeds to finish section 1 in Table 1. (Choose
at least 5 different screw rotating speeds.)
11. Plot tube outer and inner radius versus screw rotating speed and versus theoretical
prediction.
(Note: the diagrams may or may not be linear.)
Investigation of the Thickness of Tube with Different Take-Off Speeds
1. Fix the screw rotating speed and internal pressure (p i ), and adjust the take-off speed
(v t ) to a certain value.
2. Record the pressure gauge of the die section.
3. Refer to the previous section to get the volumetric feeding rate at a specific screw
rotating speed (rpm).
4. Measure the outer diameter (D o ) of the obtained tube to obtain outer radius (R o ).
5. Calculate the inner diameter (Di) to obtain inner radius (R i ) and thickness (θ) from
Eq. (16) and Eq. (17), respectively.
6. Repeat with several different take-off speeds to finish section 2 in Table 1. (Choose at
least 5 different take-off speeds.)
7. Plot tube outer and inner radius versus take-off speed and versus theoretical
prediction.
(Note: the diagrams may or may not be linear.)
Investigation of the Thickness of Tube with Different Pressure Differences
1. Fix the screw rotating speed and take-off speed, and adjust the internal pressure (p i ) to
a certain value.
2. Record the pressure gauge of the die section.
3. Refer to the previous section to get the volumetric feeding rate at a specific screw
rotating speed (rpm).
4. Measure the outer diameter (D o ) of the obtained tube to obtain outer radius (R o ).