Extrusion & Post
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Severe screw wear of PVA extruder
Problem Phenomenon
After 200h of PVA extrusion, the wear of the screw and barrel reaches 0.5mm
Cause Analysis
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
Solution
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
Key Takeaway
Screw wear is caused by filler friction and adhesion; wear-resistant screw and temperature control are the key
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