Material Drying
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PBT insufficient drying hidden degradation
Fenómeno del problema
Product appearance is basically normal, but electrical performance and impact strength fluctuate between batches, with customer complaints
Análisis de la causa
PBT's low water absorption makes people relax drying requirements, but trace moisture already catalyzes hydrolysis at high temperatures; before molecular weight decline is fully exposed in appearance, electrical and mechanical properties have quietly deteriorated
Solución
①Do not judge drying qualification by appearance; ②verify by actual moisture content measurement; ③add performance sampling inspection for critical electrical parts; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PBT's low water absorption is a trap rather than an exemption; high-temperature water sensitivity determines that drying must be quantitatively verified; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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