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Screw Profile. 5. Channel Depths. 6. Compression Ratio. 6. Helix Angle. 7. Injection Screw Design Guidelines Chart. 8. Barrel Variables. 8. Heater Bands. Since plastics are great insulators and the extruder barrel and screw mass are so large, it is difficult to remove excess viscous heat from the polymer insideBarrier design screws improve the ability of the extruder to produce a more uniform melt, as the screw has two separate flights separated by the flight land. As Look at basic screw design features. • Put the components together The single screw extruder is basically a Driven by Sliding Force Pellet to Barrel. 1.5.3 Lab-Scale machines with divided barrels or extractable screws . due to a modular design of both the screw and the barrel (see figure 1-.