Injection Molding
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PPO Fast Injection and Venting
Fenómeno del problema
【Problem Phenomenon】PPO long-runner products are filled with fast injection, but trapped air and burning appear
Análisis de la causa
Long-runner products need fast injection to ensure filling, but the mold must be ensured to have sufficient air permeability; when venting is insufficient, high-speed filling traps air and adiabatic heating causes burning; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solución
Fast injection for long-runner parts combined with sufficient venting; add venting grooves in air-trap areas; check the matching of venting and injection speed at burnt areas; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
The premise of PPO fast injection to ensure filling is that venting keeps up, otherwise burning occurs; 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 subsequent similar problems
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