Extrusion & Post
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PU screw slipping
Fenómeno del problema
During PU extrusion, the screw slips, feed does not advance, output drops sharply
Análisis de la causa
PU 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 feed section flight to increase material gripping force; 3) Dry pellet surface to reduce lubrication
Conclusión clave
Screw slipping is caused by premature melting; cooling the feed section is key
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