Processing Machinery
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Large Current Fluctuation of High-Density Polyethylene Extruder
Problem Phenomenon
The main motor ammeter reading of the extruder fluctuates greatly, exceeding the normal range.
Current fluctuation reflects unstable screw torque and may be a precursor of poor plasticization or mechanical failure.
Cause Analysis
（1）The barrel temperature is set improperly, the plasticizing section temperature is too low, and the screw torque is large
（2）Hard impurities are mixed into the raw material
（3）The screw and barrel are worn, and the gap increases
（4）The feeding is uneven, sometimes more and sometimes less
（5）The filter screen is severely clogged, and the die head resistance is large
Solution
（1）Optimize the barrel temperature to ensure the plasticizing section temperature is at a reasonable value within the 180-260°C range
（2）Check the purity of the raw material and install a magnetic rack on the hopper
（3）Check the wear of the screw and barrel, and replace them when necessary
（4）Ensure continuous and uniform feeding to prevent bridging
（5）Regularly replace the filter screen to prevent clogging
Key Takeaway
Current fluctuation is caused by large plasticization resistance or equipment problems, and needs to be solved from temperature control, raw material purity, and equipment maintenance.
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