'General Purpose' = No Purpose

摘要

merits for melt quality in this process, and plasticating rate does not determine the cycle time. But such screws have little value in extrusion, which is totally dependent on the screw design for both melt quality and output. If there really were a good "general-purpose" extrusion design there would be no further need for screw designers. Various polymers may have a few similar properties. But in truth, the properties of polymers vary so much that screw designs intended for multiple polymers are usually at best a workable compromise compared with a screw designed for a specific polymer.