Material Drying
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PA6 Drying Airflow Matching
Fenómeno del problema
In a large-tonnage drying hopper, PA6 dries unevenly between the upper and lower layers, and the moisture content of the bottom particles exceeds the standard
Análisis de la causa
After the loading volume of the drying hopper increases, the hot-air airflow is insufficient, the resistance for air to penetrate the material layer is large, the upper-layer particles are fully dried while a dead zone forms at the bottom, and the overall drying uniformity deteriorates
Solución
Match the fan airflow to the hopper capacity; generally each kilogram of material requires 0.8-1.2m³/h of drying air; add a conical disperser to the hopper to improve material distribution, and when necessary reduce the single loading volume and dry in batches
Conclusión clave
Drying airflow and loading volume must be matched; an excessively thick material layer sacrifices drying uniformity; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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