Extrusion & Post
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EMA screw slippage
Problem Phenomenon
Screw slippage during EMA extrusion with feed not advancing and output dropping sharply
Cause Analysis
EMA pellets melt too early in the feed section forming a lubricating film causing screw slippage; feed section temperature too high
Solution
1) Lower feed section temperature by 10-15°C to delay melting; 2) Deepen feed section flights to increase gripping force; 3) Dry pellet surface to reduce lubrication
Key Takeaway
Screw slippage is caused by premature melting; lowering feed section temperature is key
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