Processing Machinery
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PPS product discoloration
Fenómeno del problema
Color turns yellow and darkens.
Análisis de la causa
Thermal degradation; excessive residence at high temperature.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solución
①Control temperature; ②shorten residence; ③clean equipment; ④stabilize cycle.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusión clave
Discoloration is a signal of thermal management out of control.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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