Question

Density = 0.9 g/cc, melt volume = 10 cc, residence time = 100 s. Find extruder output in kg/h.

Hint:

Extruder throughput = $\dfrac{\text{mass in barrel}}{\text{residence time}} \times 3600$. Always convert to consistent SI units.

Answer 1

Correct Answer: 0.31

Step 1: Convert density.
\[ 0.9 \ \text{g/cc} = 0.9 \ \text{g/cm}^3 \]
Step 2: Calculate mass of polymer in melt volume.
\[ m = \rho \times V = 0.9 \times 10 = 9 \ \text{g} = 0.009 \ \text{kg} \]
Step 3: Flow rate per second.
\[ \text{mass flow} = \frac{0.009}{100} = 9 \times 10^{-5} \ \text{kg/s} \]
Step 4: Convert to kg/h.
\[ 9 \times 10^{-5} \times 3600 = 0.324 \ \text{kg/h} \] Rounded to two decimals: $0.32$ kg/h. Final Answer: \[ \boxed{0.32 \ \text{kg/h}} \]