Molds & Tooling
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PA66 hot runner temperature control
Problem Phenomenon
Hot runner mold producing PA66, gate repeatedly shows stringing and yellowing
Cause Analysis
PA66 melting point is high and sensitive to retention; hot runner temperature too high or local dead spots retain and degrade, manifesting as stringing and yellowing; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Hot runner temperature set 270-285℃ with each point temperature difference ±5℃; select dead-corner-free runner design; lower hot runner temperature when shutdown exceeds 15 minutes; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PA66 hot runners must prevent retention and local overheating, temperature uniformity is key; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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