Extrusion & Post
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Severe Screw Wear of PU Extruder
Fenómeno del problema
After 200h of PU extrusion, screw and barrel wear reaches 0.5mm
Análisis de la causa
Filler causes large wear on the screw; screw material hardness insufficient, not nitrided; processing temperature too high causing PU to adhere to the screw, aggravating wear
Solución
1) Use nitrided screw or bimetallic screw SK-2 alloy; 2) Reduce processing temperature to decrease adhesive wear; 3) Treat filler with coupling agent to reduce friction; 4) Regularly check wear, replace promptly when >0.3mm
Conclusión clave
Screw wear is caused by filler friction and adhesion; wear-resistant screw and temperature control are key
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