Molds & Tooling
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PA66 product flow marks
Problem Phenomenon
Surface ripples, obvious on high-gloss surfaces.
Cause Analysis
Unstable front; low mold temperature; the front cools fast and leaves marks; 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 flow marks and mold temperature to avoid misjudgment.
Solution
①Appropriately raise mold temperature to improve melt replication and fit to the cavity surface; ②optimize the injection speed curve to keep the melt front advancing smoothly; ③appropriately enlarge the gate to reduce shear rate and pressure loss; ④calibrate hot runner temperatures at each point to ensure temperature uniformity; ⑤open or clean vent grooves at the corresponding positions to ensure smooth gas discharge.
Key Takeaway
PA66 flow mark='front': stabilize speed and maintain temperature; the front's temperature and rhythm determine surface quality; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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