Environmental Engineering Reference
In-Depth Information
Figure 4.10
Percentage energy used as raw materials (the lower segment
of the bar), in manufacturing operations (middle, grey segment), and in
transportation of raw materials (upper black segment) in the manufacture
of different plastic resins in the United States.
Source: Based on data from Franklin Associates (2011).
Processingisanenergy-intensiveoperationastheresinhastobeplasticated
and melted prior to forming. The approximate energy demands by various
stages in common processing techniques are as follows:
Extrusion:
Drive mechanism (41%), process chilling (19%), barrel
heating (7%), resin drying (7%), and granulator (6%)
