Injection Molding
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Improper LCP Injection Speed Profile Setting
Fenómeno del problema
【Problem Phenomenon】Jetting marks in the gate area and end short shots of LCP products appear alternately; a single speed setting cannot take care of both
Análisis de la causa
LCP's low-viscosity fast-crystallization characteristics require a multi-stage profile with speed reduction at the front to prevent jetting, high-speed filling in the middle, and speed reduction at the end to prevent flash; single-speed injection can hardly match the flow state of the whole process
Solución
Adopt a multi-stage injection speed profile: low speed out of the gate to prevent jetting, high speed for main filling, deceleration at the end for venting and flash prevention; adjust switchover points according to product structure; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
LCP injection needs a multi-stage profile: slow out of the gate, fast in the middle, slow at the end; 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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