Material Drying
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PA66 silver streak and bubble differentiation
Problem Phenomenon
Silky streaks on PA66 product surface are not eliminated after moisture treatment
Cause Analysis
Besides moisture, silver streaks have three other causes: degradation gas, shear heat, and entrained air; ineffective moisture-only treatment indicates wrong cause judgment; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Air-shot strand identification: bubbles indicate moisture, transparent with filaments indicates shear; strengthen drying for moisture, reduce speed and temperature for shear, improve venting for entrained air; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Identify the cause of silver streaks first then treat accordingly, air shot is the fastest means; 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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