Material Analysis
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PC melt temperature window 280-320℃
Fenómeno do problema
Products turn yellow and have black specks, or are underfilled with obvious weld lines
Análise das causas
When the melt is below 280℃, viscosity is high, filling is difficult and internal stress is high; above 320℃, PC thermal degradation intensifies, molecular chain scission produces yellowing, black specks and gas, and performance deteriorates across the board
Solução
①Melt temperature set at 280-320℃, general-purpose grade at 270-300℃; ②Reinforced and flame-retardant grades take the upper limit; ③Use measured melt temperature to calibrate barrel set values
Conclusão principal
The PC melt temperature window is narrow and high; 280-320℃ is the core range balancing fluidity and degradation prevention, and measured calibration cannot be omitted；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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