Material Drying
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PA6 Toughened Grade Drying
Fenómeno del problema
Toughened PA6 injection molded after drying under conventional conditions still has slight silver streaks
Análisis de la causa
Toughening modifiers (such as POE grafts) affect the diffusion rate of moisture in the particles, and toughened grades are more sensitive to moisture-induced hydrolysis, so conventional drying conditions have insufficient margin
Solución
Extend the drying time of toughened PA6 to 5-6 hours, and control the moisture content below 0.15%; preferentially select toughened grades with dry packaging and use immediately after opening
Conclusión clave
Toughened grades have higher hydrolysis sensitivity, and the drying standard must be raised accordingly; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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