Troubleshooting with barrel zones
Vol. 19 #1, Feb. 1992
If a barrel zone on an extruder constantly overrides or requires too much cooling to maintain a set point, it may be that the melting is being concentrated in that section. This can either be because of screw design or improper barrel profile.
A solution is to increase the temperature of the proceeding zone to increase the melting prior to the "Hot Zone".
See also
Barrel thermocouple maintenance
Barrel zone override
Heat transfer
Screw design
Temperature control
Temperature measurement 1
Temperature measurement 2