Molds & Tooling
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POM hot runner control
Problem Phenomenon
Yellow spots and mold deposit repeatedly appear at the gate of POM hot runner molds
Cause Analysis
Local overheating or dead-corner residence in the hot runner degrades POM, and decomposition products deposit at the gate; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Set the hot runner temperature at 190-200°C and uniform at all points; select a dead-corner-free design; clean the hot runner regularly; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM hot runners must prevent dead corners and local overheating; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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