Extrusion & Post
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PVA screw slipping
Fenómeno do problema
During PVA extrusion, the screw slips, feed does not advance, output drops sharply
Análise das causas
PVA pellets melt too early in the feed section forming a lubricating film causing screw slip; feed section temperature too high
Solução
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
Conclusão principal
Screw slipping is caused by premature melting; lowering the feed section temperature is the key
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