Injection Molding
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COC Short Shot Insufficient Filling
Fenómeno del problema
COC products thin-wall areas and flow ends are incompletely filled, material shortage edges are rounded, microstructure replication incomplete, still unstable after raising temperature.
Análisis de la causa
COC melt viscosity is sensitive to temperature, fluidity is insufficient to complete long-flow filling when temperature is low; too slow injection speed cools the front; poor venting forms air back pressure hindering end filling.
Solución
①Raise melt temperature to the upper limit of the recommended range according to grade; ②injection speed adopts medium-high speed 50~150mm/s; ③strengthen end venting; ④check shot weight and runner gate size matching.
Conclusión clave
COC short shot treatment first temperature then speed then venting; medium-high speed filling is the officially recommended process; microstructure parts need special verification of replication integrity.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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