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Barrel Zone Override

Modified on Sunday, 01 February 2015 05:11 PM by mpieler Categorized as Extrusion Hints
Barrel zone override
Vol. 17 #4, Mar. 1991

The barrel/screw combination on an extruder is a very complex heat transfer system. To understand something that seems as simple as a zone override can require a complete analysis of the system.

Just a few of the factors that can cause a zone override are screw design, barrel mass, thermocouple placement, cooling jacket fit, barrel/screw wear, head pressure, overall temperature profile, defective temperature controllers and inadequate cooling.

Before assuming that zone override is strictly a screw design problem, you should analyze the system as a complete heat transfer mechanism. Although the screw is responsible for most of the heat input, it cannot control the heat distribution.

See also:
  • Barrel thermocouple maintenance
  • Extruders
  • Heat exchanger
  • Heat transfer
  • Screw design
  • Thermocouple connections 1
  • Troubleshooting with barrel zones

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