Material Drying
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PA6 Dry-State Embrittlement
Problem Phenomenon
In winter, dry PA6 cable ties and snap-fits break in large numbers during assembly
Cause Analysis
PA6 has poor toughness in the dry state; in winter low-humidity environments the moisture content approaches zero, notch sensitivity increases significantly, and brittle fracture occurs under assembly stress; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Condition before assembly to restore toughness; impact strength is best at moisture content 1.5-2.5%; keep inventory at a certain humidity; boil brittle-fracture batches in boiling water for 2-4 hours for rapid conditioning
Key Takeaway
Dry-state embrittlement is an inherent property of PA6, and conditioning is the most effective toughness restoration means; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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