Processing Machinery
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Poor Plasticization Caused by Screw Wear of High-Density 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 wears out after long-term use, and the gap between the flight 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）Excessively high screw rotation speed aggravates wear
（5）The barrel temperature is set improperly, causing local overload
Solution
（1）Check the screw wear; repair or replacement is needed when the gap exceeds 0.2mm
（2）Select wear-resistant screw materials or bimetallic screws
（3）Reduce the screw rotation speed for raw materials containing fillers
（4）Optimize the barrel temperature settings to ensure each section is at a reasonable value within the 180-260°C range
（5）Regularly maintain the screw and clean the attachments on the screw surface
Key Takeaway
Screw wear leads to decreased plasticization efficiency, and needs to be solved by selecting wear-resistant materials and regular maintenance.
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