Extrusion & Post
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EVOH extruder screw wear is severe
Fenómeno del problema
After 200h of EVOH extrusion, screw and barrel wear reaches 0.5mm
Análisis de la causa
Fillers cause heavy wear on the screw; screw material hardness insufficient without nitriding; processing temperature too high causing EVOH to adhere to the screw and aggravate wear
Solución
1) Use nitrided screw or bimetallic screw SK-2 alloy; 2) Reduce processing temperature to reduce adhesion wear; 3) Treat filler with coupling agent to reduce friction; 4) Regularly check wear amount and replace in time 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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