Processing Machinery
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Large current fluctuation of low density polyethylene extruder
Problem Phenomenon
The extruder main motor ammeter reading 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) Improper barrel temperature setting; plasticizing zone temperature too low, large screw torque
(2) Hard impurities mixed into raw material
(3) Screw and barrel wear, increased clearance
(4) Uneven feeding, sometimes more sometimes less
(5) Severe filter screen clogging, large die head resistance
Solution
(1) Optimize barrel temperature, ensure plasticizing zone temperature at a reasonable value within the 160-220°C range
(2) Check raw material purity, install magnetic grate on the hopper
(3) Check screw and barrel wear, replace when necessary
(4) Ensure continuous and uniform feeding, prevent bridging
(5) Regularly replace filter screens, prevent clogging
Key Takeaway
Current fluctuation is caused by large plasticizing resistance or equipment problems; it needs to be solved from temperature control, raw material purity, and equipment maintenance.
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