Material Drying
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PPS Insufficient Drying Bubbles
Fenómeno do problema
Internal bubbles in products, surface silver streaks, performance degradation.
Análise das causas
Although PPS has low hygroscopicity, it still needs sufficient drying; when moisture exceeds the standard, moisture vaporizes at high temperature forming bubbles and may affect crystallization behavior.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①Dry at 120~150°C for 3~4 hours; ②control moisture content below 0.02%; ③sealed conveying to prevent secondary moisture absorption; ④check drying equipment status.
Conclusão principal
PPS drying standards are strict; moisture management of high-temperature processing materials must not be relaxed.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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