Material Drying
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PA66 drying temperature window
Fenómeno del problema
PA66 dried at 100℃ for 8 hours, particles turn yellow and brittle, injection molded parts strength significantly reduced
Análisis de la causa
PA66 drying temperature over 90℃ with long-time heating causes thermal oxidative degradation, molecular weight decline manifests as yellowing and embrittlement, over-drying damages the material instead; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solución
PA66 drying temperature controlled at 80-90℃, time 4-6 hours; avoid high-temperature long-time drying; yellowed material downgraded and must not be used for structural parts; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PA66 drying window 80-90℃×4-6 hours, overtime and over-temperature both cause problems; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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