Processing Machinery
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Screw wear of polyolefin plastomer extruders causes poor plasticization (Variant: Enhanced Measures)
Problem Phenomenon
Unmelted particles appear in the product, the surface is rough, and the plasticization quality declines.
Screw wear weakens the shearing and mixing effects, and the melt quality is unstable.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Cause Analysis
（1）The screw wears 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）The screw speed is too high, aggravating wear
（5）The barrel temperature is set improperly, causing local overload
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Solution
（1）Check the screw wear; repair or replace it if the gap exceeds 0.2mm
（2）Select wear-resistant screw materials or bimetallic screws
（3）Reduce the screw speed for raw materials containing fillers
（4）Optimize the barrel temperature settings to ensure each section is at a reasonable value within the range of 180-230°C
（5）Regularly maintain the screw and clean the attachments on the screw surface
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Key Takeaway
Screw wear causes the plasticization efficiency to decline, and needs to be solved by selecting wear-resistant materials and regular maintenance.
Targeted preventive measures need to be taken in different production scenarios.
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