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