Extrusion & Post
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EMA Extruder Severe Screw Wear
Problem Phenomenon
After 200h of EMA extrusion, the wear of the screw and barrel reaches 0.5mm
Cause Analysis
Filler causes large wear on the screw; screw material hardness insufficient, not nitrided; processing temperature high, causing EMA to adhere to the screw and aggravate wear
Solution
1) Use nitrided screws or bimetallic screws of SK-2 alloy; 2) Lower processing temperature to reduce adhesive wear; 3) Treat filler with coupling agent to reduce friction; 4) Regularly check 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 key
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