Extrusion & Post
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Abnormal barrel temperature
Problembeschreibung
A certain barrel zone temperature overruns or cannot reach the set value.
When this defect appears in extrusion molded products, it is usually closely related to process links such as die design, screw plastication state, cooling and sizing system, or haul-off stability.
Persistence of the defect will lead to out-of-tolerance product dimensions, unqualified appearance, or decreased mechanical properties, increasing scrap rate and rework costs.
Timely diagnosis and troubleshooting from both extrusion process parameters and equipment status are basic requirements for ensuring stable continuous production.
Ursachenanalyse
1.
Equipment factors: Heater band burned out or poor contact.
2.
Comprehensive factors: Thermocouple drift or damage.
3.
Comprehensive factors: Solid state relay/contactor failure.
4.
Cooling/environmental factors: Air cooling or water cooling system failure causes insufficient cooling.
5.
Comprehensive factors: Improper PID parameters cause temperature oscillation.
Lösung
1.
Process parameter optimization and adjustment: Check and replace damaged heater bands.
2.
Mold/tooling improvement and maintenance: Calibrate or replace the thermocouple.
3.
Equipment inspection and system maintenance: Replace the faulty relay.
4.
Material/formulation optimization: Check the cooling system (fans, water pumps, pipelines).
5.
Operating specifications and preventive measures: Optimize PID parameters or auto-tuning.
Wichtigste Erkenntnis
This problem is a typical manifestation of abnormal barrel temperature in extrusion molding.
The core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, speed, pressure) and precision correction of the die/sizing system.
It is recommended to start with parameter adjustment and gradually go deeper into the equipment and tooling levels.
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