Molds & Tooling
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PMMA Hot Runner Temperature
Problem Phenomenon
Yellow spots appear at the gate of PMMA hot runner molds
Cause Analysis
Local overheating of the hot runner degrades PMMA, and yellow degradation products enter the cavity with the melt; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
Set hot runner temperature at 220-240℃ and calibrate each point; clean dead corners; lower hot runner temperature during shutdown; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Preventing local overheating of the PMMA hot runner is the key to preventing yellow spots; 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 similar future problems.
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