Molds & Tooling
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TPU Hot Runner Risk
Fenómeno do problema
TPU hot runner molds repeatedly show burnt spots at the gate
Análise das causas
Retention in hot runner dead corners degrades TPU; polyurethane is particularly sensitive to retention; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solução
Choose a dead-corner-free hot runner design; precisely calibrate temperature; lower temperature immediately upon shutdown; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusão principal
Preventing dead corners in TPU hot runners is an ironclad design rule; 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 similar problems in the future
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