Processing Machinery
2 views
Large current fluctuation of general-purpose polyethylene extruder
Problem Phenomenon
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.
Cause Analysis
（1）The barrel temperature is improperly set, and 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 clearance increases
（4）The feeding is uneven, sometimes more and sometimes less
（5）The filter screen is severely blocked, and the die head resistance is large
Solution
（1）Optimize the barrel temperature to ensure that the plasticizing section temperature is at a reasonable value within the range of 160-260°C
（2）Check the purity of the raw material, and install a magnetic frame on the hopper
（3）Check the wear of the screw and barrel, and replace them if necessary
（4）Ensure continuous and uniform feeding to prevent bridging
（5）Regularly replace the filter screen to prevent blockage
Key Takeaway
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.
Was this helpful?
0 people found this helpful
Thank you for your feedback!