Molds & Tooling
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PA6 Gate Halo
Problem Phenomenon
Ring-shaped whitening halos appear around the gate of PA6 products, affecting appearance
Cause Analysis
When the melt passes through a small gate, the excessively high shear rate produces shear heat and sudden molecular orientation change, and melt fracture near the gate forms halos, which is more likely with PA6 low-viscosity high-speed filling
Solution
Reduce the injection speed in the gate area using multi-stage injection, with the first stage at low speed through the gate; appropriately enlarge the gate size to reduce shear; raise melt and mold temperatures to improve the flow state
Key Takeaway
Gate halo is a shear problem, with speed reduction, gate enlargement and temperature raising working together; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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