Processing Machinery
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Large current fluctuation of heat-resistant 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) Barrel temperature setting improper, plasticizing section temperature too low and screw torque large
(2) Hard impurities mixed into raw material
(3) Screw and barrel worn, gap increased
(4) Feeding uneven, sometimes more sometimes less
(5) Screen pack severely clogged, die head resistance large
Solution
(1) Optimize barrel temperature to ensure the plasticizing section temperature is at a reasonable value within 190-230°C
(2) Check raw material purity, install a magnetic grate on the hopper
(3) Check screw and barrel wear, replace if necessary
(4) Ensure continuous and uniform feeding, prevent bridging
(5) Regularly replace the screen pack to prevent clogging
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.
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