Material Drying
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PA6 Vacuum Drying Application
Fenómeno del problema
Heat-sensitive modified PA6 yellows when dried with hot air; after switching to vacuum drying, the color and performance remain normal
Análisis de la causa
In a vacuum environment, the boiling point of water drops significantly, deep dehydration can be achieved at 60-80°C, and oxygen is isolated to avoid thermal oxidation, making it especially suitable for drying heat-sensitive, light-colored, and flame-retardant modified PA6
Solución
Vacuum drying is adopted for PA6 grades sensitive to thermal oxidation, at 60-80°C, vacuum degree above -0.09MPa, for 4-6 hours; vacuum drying can also shorten the drying cycle by about 30%
Conclusión clave
Vacuum drying achieves deep dehydration in a low-temperature oxygen-free manner and is the preferred solution for heat-sensitive PA6 grades; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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