Molds & Tooling
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TPU Crack Stress
Fenómeno del problema
TPU products crack near the gate after ejection
Análisis de la causa
Stress concentrates in the gate area; although TPU is tough, it may still crack at the notch; 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
Solución
Optimize gate design to reduce stress; appropriately increase mold temperature; avoid forced pulling during demolding; 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
Conclusión clave
For TPU cracking, check stress concentration and demolding; 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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