Material Drying
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PA66 silver streaks dominated by moisture
Problem Phenomenon
Fan-shaped silver streaks on PA66 product surface, and adjusting injection speed and temperature shows no obvious improvement
Cause Analysis
PA66 silver streaks are mostly caused by moisture: water vapor expands sharply during mold filling and breaks through the surface layer; this type of defect has no machine-adjustment solution, the only way out is to reduce moisture content below the red line
Solution
①Check drying first: dew point <-30℃, measured moisture content <0.2%; ②Check hopper moisture regain and mold water circuit leakage; ③Consider other causes only after moisture is ruled out
Key Takeaway
When PA66 has silver streaks, suspect drying first rather than process; dew point, moisture content, and moisture regain three checks are the fixed opening moves of troubleshooting; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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