Processing Machinery
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Poor plasticization caused by screw wear of heat-resistant polyethylene extruder
Fenómeno do problema
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.
Análise das causas
(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
Solução
(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
Conclusão principal
Screw wear leads to decreased plasticizing efficiency, and needs to be solved by selecting wear-resistant materials and regular maintenance.
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