Extrusion & Post
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Severe screw wear of PVA extruder
Problembeschreibung
After 200h of PVA extrusion, the wear of the screw and barrel reaches 0.5mm
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
Screw wear is caused by filler friction and adhesion; wear-resistant screw and temperature control are the key
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