Extrusion & Post
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Severe screw wear of EVA extruder
Problem Phenomenon
After 200h of EVA extrusion, screw and barrel wear reaches 0.5mm
Cause Analysis
Filler causes large wear on screw; screw material hardness insufficient without nitriding; processing temperature too high causing EVA to adhere to screw and worsen wear
Solution
1) Use nitrided screw or bimetallic screw SK-2 alloy; 2) Lower processing temperature to reduce adhesive wear; 3) Treat filler with coupling agent to reduce friction; 4) Regularly check wear and replace promptly when >0.3mm
Key Takeaway
Screw wear is caused by filler friction and adhesion; wear-resistant screw and temperature control are key
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