Processing Machinery
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Poor plasticization caused by screw wear of linear low-density polyethylene extruder
Problem Phenomenon
Unmelted particles appear in the product, the surface is rough, and plasticization quality decreases.
Screw wear weakens the shearing and mixing effects, making melt quality unstable.
Cause Analysis
(1) The screw wears out over long-term use, and the clearance between the flight and the barrel increases
(2) Hard fillers in the raw material accelerate wear
(3) The screw material has insufficient wear resistance
(4) Excessive screw speed aggravates wear
(5) Improper barrel temperature setting causes local overload
Solution
(1) Check screw wear; repair or replace if the clearance exceeds 0.2mm
(2) Select wear-resistant screw materials or bimetallic screws
(3) Reduce screw speed for filler-containing raw materials
(4) Optimize barrel temperature settings to ensure each section is at a reasonable value within the 190-250°C range
(5) Regularly maintain the screw and clean attachments on the screw surface
Key Takeaway
Screw wear reduces plasticization efficiency and needs to be solved by selecting wear-resistant materials and regular maintenance.
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