Material Drying
8 visualizaciones
PA6 Rapid Moisture Re-Absorption After Drying
Fenómeno del problema
Qualified dried pellets placed in the hopper for one or two hours show silver streaks again
Análisis de la causa
PA6 absorbs moisture extremely fast; in the humid season at 75%RH, one hour of exposure can re-absorb 0.35% moisture; even in a dry 25%RH environment, 40 hours is enough for moisture absorption to exceed the standard, and leaving the hopper open is equivalent to drying in vain
Solución
①Insulated drying hopper at 80-100°C for continuous protection; ②pellets exposed to air for no more than 30 minutes; ③enclose the feeding system and replenish frequently in small batches; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
PA6's moisture re-absorption speed far exceeds that of ordinary materials; drying is only a momentary state, and only an insulated hopper plus the 30-minute time limit can preserve the drying results until the moment of injection; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!