Processing Machinery
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Poor plasticization caused by screw wear of general-purpose polyethylene extruder
Problem Phenomenon
Unmelted particles appear in the product, the surface is rough, and the plasticization quality decreases.
Screw wear weakens the shearing and mixing effects, and the melt quality is unstable.
Cause Analysis
（1）The screw is worn after long-term use, and the clearance between the thread and the barrel increases
（2）The raw material contains hard fillers that accelerate wear
（3）The wear resistance of the screw material is insufficient
（4）The screw speed is too high, aggravating wear
（5）The barrel temperature is improperly set, and local overload occurs
Solution
（1）Check the screw wear, and repair or replace it if the clearance exceeds 0.2mm
（2）Select wear-resistant screw materials or bimetallic screws
（3）Reduce the screw speed for filler-containing raw materials
（4）Optimize the barrel temperature settings to ensure that each section is at a reasonable value within the range of 160-260°C
（5）Regularly maintain the screw and clean the attachments on the screw surface
Key Takeaway
Screw wear leads to a decrease in plasticizing efficiency, and needs to be solved by selecting wear-resistant materials and regular maintenance.
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