Material Drying
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PC Dimensional Deviation
Fenómeno del problema
[Problem Phenomenon] PC product dimensions drift and are unstable between batches
Análisis de la causa
Mold temperature and holding pressure fluctuations and moisture content changes affect shrinkage; 0.5-0.7% shrinkage requires process locking; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solución
Lock the mold temperature, holding pressure and drying; SPC monitoring; correct the mold based on actual measurements; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Conclusión clave
PC dimensions rely on parameter locking and SPC monitoring; after confirming effectiveness, solidify 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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