Molds & Tooling
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PP Burnt Trapped Air
Fenómeno del problema
【Problem Phenomenon】PP end rib positions burnt and blackened
Análisis de la causa
Trapped air adiabatic compression heats up and burns; poor venting plus high melt temperature; high incidence at end deep-cavity rib positions; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
Strengthen venting at end rib positions; reduce final-stage injection speed; call back melt temperature from the upper limit; after adjustment, take continuous samples 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 PP burnt, first clear venting, reduce final speed and control melt temperature; 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 in the future
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