Extrusion & Post
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Severe screw wear of EAA extruder
Problem Phenomenon
After 200h of EAA extrusion, the wear of the screw and barrel reaches 0.5mm
Cause Analysis
The filler causes large wear on the screw; the screw material hardness is insufficient, not nitrided; high processing temperature causes EAA to adhere to the screw and aggravate wear
Solution
1) Use nitrided screws or bimetallic screws of SK-2 alloy; 2) Lower the processing temperature to reduce adhesive wear; 3) Treat the filler with a coupling agent to reduce friction; 4) Regularly check the wear, replace in time when >0.3mm
Key Takeaway
Screw wear is caused by filler friction and adhesion; wear-resistant screws and temperature control are the key
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