Molds & Tooling
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PA6 Product Surface Flow Marks
Problem Phenomenon
Corrugated flow marks, obvious on high-gloss surfaces.
Cause Analysis
Unstable front temperature and speed; low mold temperature; the front cools quickly and leaves flow marks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; during troubleshooting, confirm item by item around key factors such as flow marks and mold temperature to avoid misjudgment.
Solution
①Raise mold temperature and material temperature;②stabilize the speed curve;③appropriately enlarge the gate to reduce shear rate and pressure loss;④open or clean vent grooves at corresponding positions to ensure smooth gas discharge;⑤calibrate the temperature of each point of the hot runner to ensure temperature uniformity.
Key Takeaway
PA6 flow marks = 'front management': stabilize speed and maintain temperature; the temperature and rhythm of the front determine surface quality; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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