Molds & Tooling
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PEI Silver Streak Temperature Causes
Fenómeno do problema
Silver streaks appear on the surface of PEI products; troubleshooting finds that two causes coexist: excessive melt temperature causing molecular chain degradation, or too low mold temperature causing excessively fast cooling.
Análise das causas
Silver streaks on the surface of PEI products may mainly be caused by molecular chain degradation due to excessively high processing temperature, or excessively fast cooling due to too low mold temperature; PEI is relatively sensitive to temperature, and temperature errors in both directions produce silver streaks.
Solução
①First verify drying to rule out moisture; ②if the melt temperature is too high, lower it to the 340~380℃ range; ③if the mold temperature is too low, raise it to 140~180℃; ④normal PEI products should have smooth surfaces without silver streaks or silver threads.
Conclusão principal
The bidirectional temperature causes of PEI silver streaks need to be verified separately; drying troubleshooting always comes first; smooth and free of silver streaks is a clear standard of normality.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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