Molds & Tooling
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Batch-to-Batch Crystallinity Fluctuation of PEEK
Problem Phenomenon
Performance testing of different batches of PEEK products shows fluctuation, hardness and strength are sometimes high and sometimes low, quality is unstable although process parameters are unchanged, and customer complaints increase.
Cause Analysis
Insufficient actual control accuracy of mold temperature, ambient temperature changes, and equipment status drift cause batch differences in crystallinity; cooling channel scaling and oil temperature controller performance decay are common hidden variables.
Solution
①Regularly calibrate the mold temperature controller output against the actually measured cavity temperature; ②Clean the cooling water channels to restore heat transfer efficiency; ③Increase the frequency of DSC crystallinity sampling inspection for critical parts; ④Establish a daily mold temperature inspection system.
Key Takeaway
Tracing PEEK quality fluctuation should first check the actual output of the temperature control system; crystallinity sampling inspection is the quantitative handle for batch consistency; equipment performance decay needs to be hedged by preventive maintenance.
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