Molds & Tooling
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PA66 flash
Problem Phenomenon
Parting line flash, needs trimming after demolding.
Cause Analysis
PA66 melt viscosity is low and easily seeps into gaps; high pressure + insufficient clamping; low viscosity is the material root cause; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Reduce pressure; ②calculate whether clamping force meets requirements based on the projected area of the product; ③repair the fitting gaps of the parting line and moving parts, fit the mold if necessary; ④appropriately lower melt temperature to reduce thermal degradation and volatile generation; ⑤use the short shot method to troubleshoot filling balance in multi-cavity molds.
Key Takeaway
PA66 flash='low viscosity + high pressure': reducing pressure and repairing fits is the main line; nylon melt is thin and sensitive to pressure and gaps, process and mold on both fronts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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