Molds & Tooling
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LCP Short Shot and Incomplete Filling
Problem Phenomenon
【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
Cause Analysis
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
Solution
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
Key Takeaway
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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