Processing Machinery
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Poor plasticization caused by screw wear of low density polyethylene extruder
Problem Phenomenon
Unmelted particles appear in products, surface is rough, plasticizing quality decreases.
Screw wear weakens shear and mixing effects, making melt quality unstable.
Cause Analysis
(1) Long-term screw wear, increased clearance between flight and barrel
(2) Hard fillers in raw material accelerate wear
(3) Insufficient wear resistance of screw material
(4) Screw rotation speed too high accelerates wear
(5) Improper barrel temperature setting, local overload
Solution
(1) Check screw wear; repair or replace if clearance exceeds 0.2mm
(2) Select wear-resistant screw material or bimetallic screw
(3) Reduce screw rotation speed for filled raw materials
(4) Optimize barrel temperature settings, ensure each zone at a reasonable value within the 160-220°C range
(5) Regularly maintain the screw, clean deposits on the screw surface
Key Takeaway
Screw wear causes decreased plasticizing efficiency; it needs to be solved by selecting wear-resistant materials and regular maintenance.
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