Processing Machinery
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Large current fluctuation of linear low-density polyethylene extruder
Fenómeno do problema
The ammeter reading of the extruder main motor fluctuates greatly, exceeding the normal range.
Current fluctuation reflects unstable screw torque and may be a precursor of poor plasticization or mechanical failure.
Análise das causas
(1) Improper barrel temperature setting; too low temperature in the plasticizing section results in large screw torque
(2) Hard impurities are mixed into the raw material
(3) The screw and barrel are worn and the clearance increases
(4) Uneven feeding, sometimes more and sometimes less
(5) The screen is severely clogged and head resistance is large
Solução
(1) Optimize barrel temperature to ensure the plasticizing section temperature is at a reasonable value within the 190-250°C range
(2) Check raw material purity and install a magnetic rack on the hopper
(3) Check screw and barrel wear, and replace if necessary
(4) Ensure continuous and uniform feeding to prevent bridging
(5) Regularly replace the screen to prevent clogging
Conclusão principal
Current fluctuation is caused by large plasticizing resistance or equipment problems and needs to be solved from temperature control, raw material purity and equipment maintenance.
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