Processing Machinery
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Poor plasticization caused by screw wear of heat-resistant polyethylene extruder (Variant: strengthened measures)
Problem Phenomenon
Unmelted particles appear in the product, the surface is rough, and the plasticizing quality decreases.
Screw wear weakens the shear and mixing effects, and the melt quality is unstable.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Screw worn after long-term use, gap between flight and barrel increases
(2) Hard fillers in raw material accelerate wear
(3) Screw material wear resistance insufficient
(4) Screw rotation speed too high aggravates wear
(5) Barrel temperature setting improper, local overload
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(1) Check screw wear, repair or replace if the gap exceeds 0.2mm
(2) Select wear-resistant screw materials or bimetallic screws
(3) Reduce screw rotation speed for filler-containing raw materials
(4) Optimize barrel temperature settings to ensure each section is at a reasonable value within 190-230°C
(5) Regularly maintain the screw, clean attachments on the screw surface
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Screw wear leads to decreased plasticizing efficiency, 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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