Extrusion & Post
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EVOH Screw Slippage
Problem Phenomenon
During EVOH extrusion, screw slips, feed does not advance, output drops sharply
Cause Analysis
EVOH pellets melt too early in the feed section forming a lubricating film causing screw slippage; feed section temperature too high
Solution
1) Reduce feed section temperature by 10-15°C to delay melting; 2) Deepen feed section flights to increase grip; 3) Dry pellet surfaces to reduce lubrication
Key Takeaway
Screw slippage is caused by premature melting; cooling the feed section is key
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