Molds & Tooling
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PET hot runner temperature
Problem Phenomenon
Stringing and crystallized white spots repeatedly appear at the gate of the preform hot runner
Cause Analysis
The hot runner temperature is uneven; when the gate zone temperature is low, the melt crystallizes prematurely, and when it is high, stringing and degradation occur; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Calibrate each hot runner temperature point to ±3℃; the gate area is independently temperature-controlled; lower the hot runner temperature during shutdown to prevent retained-material crystallization; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The temperature control accuracy of the preform hot runner directly determines the gate quality; after confirming effectiveness, solidify 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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