Material Drying
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PPO Low Water Absorption Still Requires Standardized Drying
Fenómeno del problema
【Problem Phenomenon】Drying is omitted because PPO's water absorption rate is low, and silver streaks and unsmooth phenomena appear on the product surface, with batch appearance defects
Análisis de la causa
PPO's water absorption rate is only about 0.06%, a low water absorption material, but trace moisture causes surface silver streaks and other unsmooth defects; GTX974 data clearly states that trace moisture is the culprit of silver streaks, and drying treatment is best performed
Solución
Appearance parts are dried according to specifications before molding; moisture content is accepted at an upper limit of 0.02%; material in intact sealed packaging can be used directly, material exposed after bag opening must be re-dried
Conclusión clave
Low water absorption of PPO does not mean no drying is needed; 0.02% moisture content is the appearance bottom line; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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