Injection Molding
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PVDF '2079851475616104452 Discoloration Troubleshooting Order
Problem Phenomenon
【Problem phenomenon】PVDF products turn from white to yellow and then to brown, changing gradually across multiple batches, making cause location difficult
Cause Analysis
Discoloration is a progressive signal of thermal degradation: temperature drift, excessive residence, nozzle overtemperature, and dead spot carbonization peeling can all cause it; systematic troubleshooting is required rather than blindly lowering temperature; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Troubleshoot in order: measure each zone melt temperature → calculate residence time → check nozzle independent temperature control → clean the machine and check dead spot carbonized material; establish a discoloration grade comparison card to trace the trend
Key Takeaway
Discoloration is a progressive alarm; troubleshoot systematically in the order of temperature, residence, nozzle, and dead spots; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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