Injection Molding
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PA66 '2079851475616104452 weld line whitening
Problem Phenomenon
White lines, obvious on dark-colored parts.
Cause Analysis
Cold front + gas impurities; different reflection characteristics at convergence; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; during troubleshooting, confirm item by item around key factors such as weld lines and whitening to avoid misjudgment.
Solution
①Raise temperature; ②open or clean vent grooves at the corresponding positions to ensure smooth gas discharge; ③set overflow wells at the convergence to lead the cold front out of the cavity; ④adjust gate position/number to change melt flow direction and convergence position; ⑤increase injection speed to maintain melt front temperature and improve filling.
Key Takeaway
PA66 white line='cold front': raise temperature, vent, overflow wells; appearance parts need weld lines hidden; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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