Molds & Tooling
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PVC Hot Runner Risk
Problem Phenomenon
PVC hot runner molds frequently show degradation black spots
Cause Analysis
Hot runner dead corners and local overheating make PVC stay and degrade; hot runner risk for PVC is higher than other materials; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
PVC hot runner choose large-runner dead-corner-free design; temperature precisely calibrated; prioritize cold runner; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PVC with hot runner needs extra caution, cold runner is safer; 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 problems later
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