Material Drying
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Degradation during PLA twin-screw extrusion granulation
Fenómeno del problema
Severe degradation and molecular weight decrease occur during PLA recycling granulation.
Análisis de la causa
The twin-screw shear is strong and the temperature is high, and PLA degrades quickly, especially when it contains moisture, hydrolysis and pyrolysis act together.
Solución
Use a low-shear screw configuration; strictly control the temperature at 160-180°C; fully dry the waste material.
Conclusión clave
PLA granulation is a technical difficulty for recycling.
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