Extrusion & Post
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EVOH Screw Slippage
Fenómeno del problema
During EVOH extrusion, screw slips, feed does not advance, output drops sharply
Análisis de la causa
EVOH pellets melt too early in the feed section forming a lubricating film causing screw slippage; feed section temperature too high
Solución
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
Conclusión clave
Screw slippage is caused by premature melting; cooling the feed section is key
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