Material Drying
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PA6 Stress Whitening
Fenómeno del problema
White marks appear at impacted or bent positions of PA6 products
Análisis de la causa
Crazing and microcracks in the stressed zone scatter light and appear white; dry-state PA6 with low toughness is more prone to stress whitening, aggravated by low-temperature environments; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solución
Improve product toughness: conditioning treatment, avoid dry-state low-temperature impact; avoid sharp corners and wall thickness sudden changes in design; select toughened grades when toughness requirements are high; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Stress whitening is a signal of insufficient toughness, and conditioning plus toughening are the main countermeasures; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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