Abstract
A theoretical investigation of the effect of geometrical and structural variables on the energy efficiency of single screw extruders with and without a compression section is presented. For these extruders it was concluded that efficiency increases with increasing screw helix angle, channel height and clearance height and decreases with increasing L/D ratios. Lowering the rotational velocity of the screw and raising pressure increases the energy efficiency. Increasing the feed section lenght of screw extruders with compression sections decreases their energy efficiency significantly. Changing the length of the metering section, however, has little effect. The energy efficiency of extruders with a compression section is much greater than that of single parallel extruders (generally at least double) when all other parameters remain unchanged.
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