Processing Machinery
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PPS Discoloration Streaks
Fenómeno do problema
Yellow or brown streaks appear on the parts, and color hue is unstable between batches
Análise das causas
PPS discoloration streaks originate from melt overheating: barrel temperature exceeding limits, too-high back pressure, too-fast screw speed, and too-long retention; streak positions mostly correspond to shear concentration areas
Solução
①Return barrel temperature to the 300-340°C window; ②Reduce back pressure and rotation speed; ③Investigate retention points and dead corners; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PPS discoloration is a map of shear heat; streak positions guide the troubleshooting direction, and lowering temperature and speed is the main line; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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