Sometimes you might be called on to trou-bleshoot an extrusion operation without being able to physically inspect the screw to note its design. In these cases, you'll need to get a "feel" for the design by combining all the normally measured external parameters (output, motor load, melt temperature, stability, etc.) along with the heat flow in and out of the barrel. Since most of the energy going into the polymer comes from the screw rotating in the barrel, you can get some insight about the screw design without any dimensions on smooth-bore extruders.
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