Material Drying
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PA6 Stress Whitening
Problem Phenomenon
White marks appear at impacted or bent positions of PA6 products
Cause Analysis
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
Solution
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
Key Takeaway
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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