Q$1.$

a$.$ Draw a single$-$screw extruder for plastics and elastomers and label its components and features.

b$.($SI units$)$ The diameter of an extruder barrel $=85mm$ and its length $=2\mathrm{.}00m.$ The screw rotates at $55re\frac{v}{m}in,$ its channel depth $=8\mathrm{.}0mm,$ and its $fl$ ight angle $=18.$ Head pressure at the die end of the barrel $=10\mathrm{.}0{10}^{6}Pa.$ Viscosity of the polymer melt $=100Pa-s.$ Find the volume fl ow rate of plastic at the die end of the barrel.