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