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  Ff = L/D (where L = barrel length and D = screw diameter)<ref name="Wolcott & Englund" />
  Ff = L/D (where L = barrel length and D = screw diameter)<ref name="Wolcott & Englund" />


Despite this friction force being essential to moving the material down the barrel of the extruder, the creation of this force requires a large amount of energy and can have ill effects on the part's properties. In order to improve upon the material and energy efficiencies of the extrusion process, the twin-screw extruder will be discussed as a more efficient improvement on this single-screw extruder.
Despite this friction force being essential to moving the material down the barrel of the extruder, the creation of this force requires a large amount of energy and can have ill effects on the part's properties. In order to improve upon the energy efficiencies of the extrusion process, the twin-screw extruder will be discussed as a more efficient improvement on this single-screw extruder.


=== Injection Molding ===
=== Injection Molding ===
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