Molds & Tooling
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LCP Dimensional Fluctuation and Batch Instability
Problem Phenomenon
【Problem Phenomenon】Under the same process, key dimensions of LCP products fluctuate between batches, and the variation trends of flow-direction and transverse dimensions are inconsistent
Cause Analysis
Metering backflow, mold temperature fluctuation and crystallization rate differences jointly cause dimensional drift; LCP shrinkage is extremely small, so any process fluctuation is amplified on precision dimensions; Celanese troubleshooting lists a special item on dimensional fluctuation and associates it with the check ring and mold temperature
Solution
First measure check ring backflow to rule out metering problems; raise the temperature control accuracy of the mold temperature controller to within ±2℃; fix the holding switchover point and back pressure, and establish SPC monitoring of key dimensions
Key Takeaway
LCP's low shrinkage amplifies process fluctuations; metering and mold temperature stability are the keys to dimensions; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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