Material Drying
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PA66 stress whitening
Fenómeno del problema
White marks appear at impact locations of PA66 products
Análisis de la causa
Silver-streaking in the impact zone scatters light and appears white, and insufficient toughness in dry state at low temperature makes it more likely; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solución
Moisture condition products to restore toughness; avoid dry-state low-temperature impact; avoid sharp corners in structure; select toughened grades for high toughness requirements; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Conclusión clave
Stress whitening indicates insufficient toughness reserve, moisture conditioning and toughening treat the symptom; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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