Extrusion & Post
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PVA screw slipping
Fenómeno del problema
During PVA extrusion, the screw slips, feed does not advance, output drops sharply
Análisis de la causa
PVA pellets melt too early in the feed section forming a lubricating film causing screw slip; feed section temperature too high
Solución
1) Lower feed section temperature by 10-15°C to delay melting; 2) Deepen the feed section flight to increase material gripping force; 3) Dry the pellet surface to reduce lubrication
Conclusión clave
Screw slipping is caused by premature melting; lowering the feed section temperature is the key
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