Molds & Tooling
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LCP Burning and Discoloration
Problem Phenomenon
【Problem Phenomenon】Brown to black burn marks appear at product ends or poorly vented areas, and the overall tone turns yellow and dark
Cause Analysis
Trapped air in the cavity is compressed at high speed and adiabatically heated, burning the melt, or the melt stagnates in dead spots of the barrel and nozzle and overheats and degrades; LCP processing temperature is high, so stagnation degradation is faster; Celanese troubleshooting lists a special item on burning and discoloration
Solution
Strengthen venting at ends and rib positions, and reduce the final-stage injection speed; clean dead spots at the nozzle flange and hot runner, and shorten melt residence time; when discoloration occurs, verify the actual temperature of each zone
Key Takeaway
For LCP burning, check venting and dead-spot stagnation first; residence time is a red line for high-temperature materials; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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