Molds & Tooling
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LCP Short Shot and Incomplete Filling
Problembeschreibung
【Problem Phenomenon】Individual cavities of thin-wall multi-cavity LCP products are incompletely filled with material shortage at the ends, and raising the temperature shows no obvious improvement
Ursachenanalyse
Although LCP has good fluidity, it crystallizes extremely fast; the melt front solidifies and seals as soon as its temperature drops slightly; when multi-cavity runners are unbalanced or venting is poor, end cavities short-shot; Vectra troubleshooting lists short shot as a special item and associates it with mold temperature and venting
Lösung
Raise the mold temperature to the upper end of the 70-130℃ range and verify runner balance; clean and deepen the end vent grooves; increase injection speed rather than simply raising temperature, and enlarge the gate if necessary
Wichtigste Erkenntnis
LCP short shots are mostly due to rapid crystallization sealing; raising mold temperature, speeding up and venting take priority over raising melt temperature; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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