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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