Processing Machinery
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PPS Discoloration Streaks
Problem Phenomenon
Yellow or brown streaks appear on the parts, and color hue is unstable between batches
Cause Analysis
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
Solution
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
Key Takeaway
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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